annual 2019 post-closure monitoring report

Annual 2019 Post-Closure Monitoring Report Former Section 29 Surface Impoundments Lost Hills, California

Prepared for:

San Joaquin Valley Business Unit October 15, 2019 Bakersfield, California 93302 Project 0075802017

Wood Environment & Infrastructure Solutions, Inc. 1281 East Alluvial Avenue, Suite 101

Fresno, CA 93720-2659 USA

T: 559-264-2535

www.woodplc.com

‘Wood’ is a trading name for John Wood Group PLC and its subsidiaries

October 15, 2019 Project 0075802017 Ms. Linh Vo Chevron North America Exploration and Production San Joaquin Valley Business Unit Post Office Box 1392 Bakersfield, California 93302 Subject: Annual 2019 Post-Closure Monitoring Report

Former Section 29 Surface Impoundments Lost Hills, California

Dear Ms. Vo: Wood Environment & Infrastructure Solutions, Inc. (Wood), is pleased to present the enclosed report describing the results of post-closure monitoring activities performed during 2019 at the former Section 29 Surface Impoundments located in Lost Hills, California. The report has been prepared on behalf of the San Joaquin Valley Business Unit of Chevron North America Exploration and Production (Chevron) for submittal to the Central Valley Regional Water Quality Control Board. Wood is pleased to be of continuing service to Chevron. If you have any questions, please call either of us. Sincerely, Wood Environment & Infrastructure Solutions, Inc. Leslie K. Purvis, LEP William V. Pipes, PG Environmental Scientist Principal Geologist I:\7000s\7580.000\Archive\7580-191.docx

(Submitted Electronically) cc: Jeffrey Johnson, Chevron Ron Holcomb, RWQCB

Annual 2019 Post-Closure Monitoring Report Former Section 29 Surface Impoundments Lost Hills, California Prepared for: Chevron North America Exploration and Production San Joaquin Valley Business Unit Post Office Box 1392 Bakersfield, California 93302 Prepared by: Wood Environment & Infrastructure Solutions, Inc. 1281 East Alluvial Avenue, Suite 101 Fresno, California 93720 T: 559-264-2535 October 15, 2019 Project 0075802017 Copyright and non-disclosure notice The contents and layout of this document are subject to copyright owned by Wood (© Wood Environment & Infrastructure Solutions, Inc.) to the extent that copyright has been legally assigned by us to another party or is used by Wood under license. To the extent that we own the copyright in this document, it may not be copied or used without our prior written agreement for any purpose other than the purpose indicated in this document. The methodology (if any) contained in this document is provided to you in confidence and must not be disclosed or copied to third parties without the prior written agreement of Wood. Disclosure of that information may constitute an actionable breach of confidence or may otherwise prejudice our commercial interests. Any third party who obtains access to this document by any means will, in any event, be subject to the Third-Party Disclaimer set out below.

Third-party disclaimer Any disclosure of this document to a third party is subject to this disclaimer. The document was prepared by Wood at the instruction of, and for use by, our client named on the front of the document. It does not in any way constitute advice to any third party who is able to access it by any means. Wood excludes to the fullest extent lawfully permitted all liability whatsoever for any loss or damage howsoever arising from reliance on the contents of this document. We do not however exclude our liability (if any) for personal injury or death resulting from our negligence, for fraud or any other matter in relation to which we cannot legally exclude liability.

Professional declaration This document was prepared by Wood staff under the supervision of the Geologist whose seal and signature appears hereon. The findings, recommendations, specifications, or professional opinions presented in this document were prepared in accordance with generally accepted professional geologic practice and within the scope of the project. No other warranty, express or implied, is provided.

______________________________________________________ William V. Pipes, PG Principal Geologist

Annual 2019 Post-Closure Monitoring Report Former Section 29 Surface Impoundments

Lost Hills, California

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Table of contents 1.0 Introduction ........................................................................................................................................................................... 1 2.0 Background ............................................................................................................................................................................ 1 3.0 Annual 2019 Monitoring Activities ............................................................................................................................... 2

3.1 Groundwater Monitoring ................................................................................................................................. 2 3.2 Soil Moisture Monitoring ................................................................................................................................. 4 3.3 Impoundment Cover Inspection ................................................................................................................... 4

4.0 Annual 2019 Monitoring Results ................................................................................................................................... 4 4.1 Groundwater Occurrence ................................................................................................................................. 4 4.2 Groundwater Quality ......................................................................................................................................... 5 4.3 Soil Moisture ......................................................................................................................................................... 7 4.4 Impoundment Cover Inspection ................................................................................................................... 8

5.0 Financial Assurance Review ............................................................................................................................................. 8 5.1 Monitoring and Reporting Costs .................................................................................................................. 8 5.2 Maintenance Costs ............................................................................................................................................. 9 5.3 Summary of Estimated Costs ......................................................................................................................... 9

6.0 Summary of 2019 Post-Closure Activities .................................................................................................................. 9 7.0 Future Post-Closure Monitoring Activities ..............................................................................................................10 8.0 References ............................................................................................................................................................................10

List of tables Table 1: Well Construction Summary Table 2: Depth to Groundwater and Groundwater Elevation Data Table 3: Purge and Field Parameter Data Table 4: Laboratory Analytical Results Table 5: Anion-Cation Balance Table 6: Laboratory Analytical Results – Oxygen and Hydrogen Isotopes Table 7: Soil Moisture Data Table 8: Summary of Post-Closure Maintenance and Monitoring Costs

List of figures Figure 1: Site Location Map Figure 2: Site Plan and Potentiometric Surface Map Figure 3: Piper Diagram, Water Samples, Initial Sampling and April 2019 Figure 4: Oxygen and Hydrogen Isotope Ratios

List of appendices Appendix A: Hydrographs Appendix B: Laboratory Analytical Reports and Chain-of-Custody Records Appendix C: Time Concentration Charts Appendix D: Cover Inspection Documents



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1.0 Introduction Wood Environment & Infrastructure Solutions, Inc. (Wood), has prepared this report describing the results of post-closure monitoring activities performed in 2019 at the former Section 29 Surface Impoundments (impoundments) located at the Lost Hills Oil Field in Kern County, California. This report has been prepared on behalf of the San Joaquin Valley Business Unit of Chevron North America Exploration and Production (Chevron) for submittal to the Central Valley Regional Water Quality Control Board (RWQCB). Post-closure monitoring activities were performed as part of the post-closure maintenance and monitoring program for the former impoundments. Groundwater, soil moisture, and facility monitoring were performed in accordance with Waste Discharge Requirements (WDRs) Order No. R5-2013-0056 and its associated Monitoring and Reporting Program (MRP), which were issued to Chevron on May 31, 2013, by the RWQCB (RWQCB, 2013a). This monitoring report is organized as follows:

• Section 2.0 – background information on the site and a brief summary of previous investigations.

• Section 3.0 – a description of groundwater and soil monitoring activities.

• Section 4.0 – a discussion of the field and laboratory results from the 2019 annual groundwater and soil monitoring events.

• Section 5.0 – a summary of the 2019 annual financial assurance review.

• Section 6.0 – a summary of post-closure monitoring and inspection activities conducted in 2019.

• Section 7.0 – a brief description of future activities.

• Section 8.0 – references used in preparing this report.

2.0 Background The former impoundments are located in northwestern Kern County on GP Road between Holloway and Lost Hills Roads, about 3 miles northwest of the town of Lost Hills, California (Figure 1). The former impoundments occupy approximately 26 acres and are bounded by agricultural land to the north and east and the Lost Hills Oil Field to the south and west (Figure 2). Background information for the site is summarized in groundwater investigation reports prepared between 2000 and 2004. The results of these investigations indicated that produced water infiltrated from the former impoundments and mixed with the existing poor quality alluvial groundwater in the vicinity of the former impoundments. In December 2000, monitoring well 29MW-1 was installed about 500 feet southwest and upgradient of the former impoundments. In August and September 2004, off-site sentinel wells 21MW-1, 21MW-2, and 21MW-3 were installed. These three sentinel wells were designed to monitor the downgradient extent of the produced water mixed with native groundwater at the time. In August 2007, monitoring well 29MW-2 was installed about 2,200 feet northeast of upgradient well 29MW-1 (Figure 2). This location is in the center of affected groundwater downgradient of the former impoundments. In November 2014, Chevron installed groundwater monitoring wells 21MW-4 and 21MW-5 about 3,200 feet northeast (downgradient) of well 21MW-1. Deep well 21MW-5 and shallow well 21MW-4 were installed to further characterize the




lateral and vertical extent of constituents of concern in groundwater downgradient of monitoring well 21MW-1, per the WDRs. The groundwater monitoring network currently consists of seven wells: one well upgradient of the former impoundments (well 29MW-1) and six wells downgradient of the former impoundments (wells 29MW-2, 21MW-1, 21MW-2, 21MW-3, 21MW-4, and 21MW-5). Except for well 21MW-5, the downgradient wells are completed across a relatively thick and continuous water-bearing sand that occurs at the base of the Quaternary deposits within the Older Alluvium, just above a fine-grained layer called the Corcoran Clay Equivalent and the Tulare Formation. This sand is referred to as the Basal Alluvial Sand. The Basal Alluvial Sand is a pathway for the migration of produced water downgradient of the former impoundments (Geomatrix, 2004). Well 21MW-5 is completed below the Corcoran Clay Equivalent in the upper portion of the Tulare Formation to assess whether produced water from the impoundments migrated below the Corcoran Clay Equivalent into the upper portions of the Tulare Formation. Monitoring well construction details are summarized in Table 1, and well locations are shown on Figure 2. A Groundwater Corrective Action Plan for the former impoundments was submitted to the RWQCB in June 2006 (Geomatrix, 2006). The RWQCB approved the Groundwater Corrective Action Plan in March 2007 (RWQCB, 2007). Chevron ceased sending water to the former impoundments in February 2008. Chevron completed closure of the former impoundments in March 2009. Former impoundment closure activities consisted of excavating residual waste from the former impoundments, collecting confirmation samples below the residual waste, backfilling and compacting the former impoundments with fill material, placing the final cover, and conducting a post-closure site survey. A Closure Report was submitted to the RWQCB in March 2009 (AMEC Geomatrix, 2009). The RWQCB approved final closure of the former impoundments in August 2010 (RWQCB, 2010). In May 2013, WDRs Order No. R5-2013-0056 was adopted and required preparation and submittal of additional post-closure monitoring plans. Chevron submitted a Sampling and Analysis Plan, Water Quality Monitoring Plan, and Post-Closure Maintenance and Monitoring Plan to the RWQCB on July 31, 2013 (AMEC, 2013a, 2013b, and 2013c). The RWQCB approved the Sampling and Analysis Plan in an August 27, 2013, letter (RWQCB, 2013b), the Water Quality Monitoring Plan in an August 28, 2013, letter (RWQCB, 2013c), and the Post-Closure Maintenance and Monitoring Plan in a September 18, 2013, letter (RWQCB, 2013d).

3.0 Annual 2019 Monitoring Activities Annual post-closure monitoring activities in 2019 included groundwater monitoring, soil moisture monitoring, and inspecting the former impoundment cover in accordance with the MRP. These activities are described in the following subsections. 3.1 Groundwater Monitoring Annual groundwater monitoring was performed at the former impoundments on April 22, 2019. The monitoring was performed in accordance with the Sampling and Analysis Plan and Post-Closure Maintenance and Monitoring Plan. Groundwater monitoring consisted of measuring the depth to groundwater and collecting groundwater samples from the seven monitoring wells for laboratory analysis.




The depth to groundwater was measured to the nearest 0.01 foot in each well using an electric water level sounder. The sounder was cleaned between each measurement by washing with a Liquinox solution and then rinsing with clean water followed by deionized water. Before sample collection, a minimum of two pump and riser tubing volumes was purged from each monitoring well using micropurge methods. During purging, field parameters (pH, specific conductance, and temperature) were monitored. Approximately 11 gallons of purge water were generated and contained in a portable tank. The purge water was disposed of at the Lost Hills ENWARS facility, as directed by Chevron. After purging was complete and field parameters had stabilized, a groundwater sample was collected from each monitoring well using micropurge methods. Sample containers were supplied by the laboratory. After sample collection, the containers were labeled, placed in an ice-chilled chest, and transported using chain-of-custody procedures to TestAmerica Laboratories, Inc. (TestAmerica), a California-certified laboratory located in Irvine, California, for chemical analysis. The groundwater samples were analyzed by TestAmerica using U.S. Environmental Protection Agency (EPA) approved methods for the constituents listed in the following table.

Matrix/Type Constituent Method1 Monitoring Parameters Total Dissolved Solids EPA 160.1

Electrical Conductivity EPA 120.1 Chloride EPA 300.0 Boron, dissolved EPA 6010B

Constituents of Concern Total Alkalinity, dissolved SM 2320B Standard Minerals Carbonate, dissolved SM 2320B

Bicarbonate, dissolved SM 2320B Sulfate, dissolved EPA 300.0 Nitrate as Nitrogen, dissolved EPA 300.0 Calcium, dissolved EPA 6010B Magnesium, dissolved EPA 6010B Sodium, dissolved EPA 6010B Potassium, dissolved EPA 6010B

Aromatic Hydrocarbons Benzene EPA 8260B Toluene EPA 8260B Ethylbenzene EPA 8260B Xylenes (m,p-xylenes and o-xylenes) EPA 8260B

Isotopes Oxygen (Delta [δ]-18O) and Hydrogen (δ-D) CF-IRMS 1. EPA - U.S. Environmental Protection Agency and SM - standard method.

Quality assurance/quality control (QA/QC) samples also were collected, including a replicate sample from well 21MW-1, an equipment blank, field blank, and trip blank. The QA/QC samples were analyzed by TestAmerica for petroleum hydrocarbon constituents. Additional sample volume was collected for a matrix spike/matrix spike duplicate. In addition to annual groundwater monitoring in accordance with the WDRs, groundwater samples were also collected from monitoring well 21MW-4 on behalf of the Westside Water Quality Coalition (WWQC).




Groundwater sampling was performed for the WWQC in December 2018 and June 2019, and the groundwater samples were analyzed for nitrate as nitrogen using EPA Method 300.0. 3.2 Soil Moisture Monitoring Soil moisture monitoring of the former impoundment cover was conducted on April 23, 2019. The monitoring was performed in accordance with the MRP and additional requirements specified by the RWQCB in their approval of the Post-Closure Maintenance and Monitoring Plan (RWQCB, 2013d). Soil moisture monitoring is being conducted to assess the possible infiltration of water through the final cover of the closed impoundments and to confirm the results of the unsaturated zone modeling. The simulations of water infiltration into the closed and covered surface impoundments infiltrating water would be limited to the upper portions of the backfill and cover and, therefore, could not contribute a recharge flux to groundwater beneath the impoundments (AMEC Geomatrix, 2008). The sample location is in the southern portion of the cover, about 100 feet northeast of the end of the southern perimeter fence (Figure 2). The sample location was chosen in 2010 based on accessibility and representativeness. The sample location was staked, flagged, and marked using a hand-held global positioning system; soil samples are collected from this location each year. The soil moisture samples were obtained by advancing a drive sampler equipped with a precleaned stainless steel sample sleeve to a depth of 1.5 feet, then 3 feet below ground surface. The sample sleeves were removed from the drive sampler at the appropriate depth and the soil cores were capped, labeled, and transported to the Wood geotechnical laboratory in Newport Beach, California, using chain-of-custody procedures. The sample was analyzed for moisture content using ASTM International Test Method D 2216. Upon completion of soil sampling, the sample location was backfilled with native soil to match the grade of the former impoundments and tamped down. 3.3 Impoundment Cover Inspection Chevron personnel performed post-storm inspections of the impoundment cover on October 2, 2018, and March 12, 2019, following significant rain events in the vicinity of the impoundments. Chevron personnel also performed an annual inspection of the cover of the closed impoundments on August 20, 2019. 4.0 Annual 2019 Monitoring Results The results of the April 2019 groundwater and soil monitoring conducted at the former impoundments and impoundment inspections performed during the reporting period are described in the following subsections. Groundwater hydrographs are provided in Appendix A, the laboratory analytical data for groundwater and soil are provided in Appendix B, time concentration charts for selected constituents of concern in groundwater are provided in Appendix C, and cover inspection documents are provided in Appendix D. 4.1 Groundwater Occurrence The depth to groundwater was measured in the monitoring wells on April 22, 2019. Depth-to-groundwater measurements and calculated groundwater elevations are summarized in Table 2. The depth to groundwater in the six wells completed in the Basal Alluvial Sand ranged from 68.27 to 108.70 feet below the top of casing, and groundwater elevations ranged from 216.84 to 224.5 feet with reference to North American Vertical Datum 1988 (NAVD88) (Table 2). Upgradient well 29MW-1 was dry. The average horizontal groundwater gradient was 0.0010, or about 5.08 feet per mile. The gradient has been decreasing since May 2008 when discharges to the former impoundment ceased. The decrease of the groundwater




gradient downgradient of the closed impoundments indicates that the mound of groundwater formed from the discharge of produced water from the impoundments is dissipating. The potentiometric surface map for this reporting period (Figure 2) indicates that groundwater flows to the east-northeast, similar to the flow direction observed during previous monitoring events. The depth to groundwater in the deeper Tulare Formation well 21MW-5 was 286.82 feet below the top of casing, and the calculated groundwater elevation was -2.08 feet NAVD88 (Table 2). The groundwater elevation in well 21MW-5 was 218.92 feet lower than in its companion well 21MW-4 (216.84 feet NAVD88), demonstrating the lack of a hydraulic connection between the Basal Alluvial Sand and the Tulare Formation at this location. There are insufficient data to calculate the horizontal gradient and flow direction for groundwater in the Tulare Formation. Hydrographs for the monitoring wells are provided in Appendix A. The comparative hydrograph (A-1) shows groundwater elevations measured in all seven monitoring wells. Hydrographs A-2 through A-8 display the groundwater elevation, screened interval, and pump intake location for each monitoring well. The hydrographs show a steady decline in water levels in all the wells since 2007. The decline is greater in the wells closest to the former impoundments (wells 29MW-1 and 29MW-2), as the mound of groundwater caused by previous produced water disposal dissipates. 4.2 Groundwater Quality The purging and field parameter data for the groundwater samples are summarized in Table 3, laboratory analytical results are summarized in Table 4, anion-cation balances are summarized in Table 5, and isotope data are summarized in Table 6. Groundwater sample data from October 2004 to the present are included in Tables 4 and 5. A piper diagram showing the geochemistry of the groundwater samples is shown on Figure 3, and a diagram of the oxygen and hydrogen isotope ratios is shown on Figure 4. The groundwater quality results for the April 2019 monitoring event are summarized in the following paragraphs. Field Parameters The field parameters measured during groundwater sampling during the April 2019 groundwater monitoring event are summarized as follows:

Alluvium Wells: The temperature of the groundwater samples collected from the wells monitoring the alluvium at the end of purging ranged from 22.1 to 22.9 degrees Celsius, and pH ranged from 6.36 to 7.48 standard units. Electrical conductivity (EC) measured in the field at the end of purging ranged from 3,534 micromhos per centimeter (µmhos/cm) to 20,590 µmhos/cm. These measurements are within the range of previous field parameter data for samples from these wells.

Tulare Formation Well: The temperature of the groundwater sample collected from the well monitoring the Tulare Formation at the end of purging was 23.7 degrees Celsius, and pH was 8.30 standard units. EC measured in the field at the end of purging was 3,235 µmhos/cm. These measurements are within the range of previous field parameter data for samples from this well.




Inorganics and General Chemistry Analytical results of the groundwater samples collected during the April 2019 groundwater monitoring event are summarized as follows:

• Alluvium Wells

Boron concentrations ranged from 4.3 to 45 milligrams per liter (mg/L). These concentrations are similar to previous results.

Cations – Calcium concentrations ranged from 270 to 1,400 mg/L and magnesium concentrations ranged from 92 to 530 mg/L, both similar to previous results. Potassium concentrations ranged from 7.3 to 22 mg/L and sodium concentrations ranged from 620 to 4,300 mg/L, both similar to previous results. The calcium and sodium results were qualified with a “B,” indicating that calcium/sodium was detected in the method blank for these samples.

Anions – Bicarbonate alkalinity concentrations ranged from 130 to 620 mg/L, similar to previous results. Carbonate and hydroxide alkalinity concentrations were less than the detection limit in each of the sampled wells. Chloride concentrations ranged from 870 to 9,800 mg/L, and nitrate as nitrogen concentrations ranged from non-detect to 0.84 J mg/L (the “J” qualifier indicates an estimated result less than the reporting limit). Sulfate concentrations ranged from 1,500 to 2,800 mg/L. The anion concentrations are similar to previous results.

Total dissolved solids concentrations ranged from 3,800 to 21,000 mg/L, similar to previous results.

Laboratory EC measurements ranged from 5,300 to 34,000 µmhos/cm, similar to previous results.

Concentrations of inorganics and general chemistry analytes in WWQC samples collected from well 21MW-4 were similar to previous data for this well.

• Tulare Formation Well

The boron concentration was 3.3 mg/L, similar to previous results.

Cations – The calcium concentration was 230 B mg/L and the magnesium concentration was 57 mg/L, both similar to previous results. The potassium concentration was 8.2 mg/L and the sodium concentration was 490 B mg/L, both similar to previous results. The calcium and sodium results were qualified with a “B,” indicating that calcium/sodium was detected in the method blank for this sample.

Anions – The bicarbonate alkalinity concentration was 76 mg/L, similar to previous results. Carbonate and hydroxide alkalinity concentrations were less than the detection limit. The chloride concentration was 410 mg/L and nitrate as nitrogen was non-detect. The sulfate concentration was 1,400 mg/L. The anion concentrations are similar to previous results.

The total dissolved solids concentration was 2,900 mg/L, similar to previous results.

The laboratory EC measurement was 3,900 µmhos/cm, similar to previous results.

Anion-cation balances were calculated for groundwater samples collected from October 2004 to the present (Table 5). The balance results for the samples collected in April 2019 ranged from -8.02 to -4.39 percent. Figure 3 shows a piper diagram depicting the geochemistry of the groundwater samples




collected from each monitoring point during its initial sampling and during the April 2019 monitoring event. Since well 29MW-1 has been dry since 2015, the 2014 results are shown. The piper diagram indicates that the most recent groundwater samples collected from wells 21MW-1, 29MW-1, and 29MW-2 are a sodium-chloride type water, and the groundwater samples collected from wells 21MW-2, 21MW-3, 21MW-4, and 21MW-5 are a sodium-sulfate type water (Figure 3). Petroleum Hydrocarbons Benzene, toluene, ethylbenzene, and xylenes were not detected at concentrations greater than their reporting limits in the groundwater samples collected during this monitoring event, except for downgradient well 29MW-2. Benzene was detected at a concentration of 17 micrograms per liter (µg/L), o-xylenes was detected at a concentration of 1.8 J μg/L, and m,p-xylenes was detected at a concentration of 0.59 J μg/L (the “J” qualifier indicates an estimated result less than the reporting limit.) These results are similar to previous results for well 29MW-2. Tentatively Identified Compounds The Standard Provisions and Reporting Requirements associated with the MRP specify the reporting of tentatively identified compounds (TICs) detected in the groundwater samples (RWQCB, 2003). No TICs were identified at concentrations greater than their reporting limits in the groundwater samples collected from the monitoring wells during this monitoring event. One TICs in the groundwater sample from downgradient well 29MW-2 was identified: 1,2,3-trimethylbenzene. All the other TICs identified in the groundwater samples were listed as “unknown.” The QA/QC samples also were analyzed for petroleum hydrocarbons and TICs. As shown in Table 4, petroleum hydrocarbons were not detected. TICs were identified in the field, equipment, and trip blank samples at concentrations less than their reporting limits. As with the groundwater samples, the TICs were listed as “unknown.” Oxygen and Hydrogen Isotopes The groundwater samples were analyzed for oxygen and hydrogen isotopes to help differentiate between unaffected native groundwater and groundwater mixed with produced water from the impoundments. Produced water is connate water (water originally present as the sediments were deposited) and native groundwater is meteoric water (water from rainfall that has recharged the aquifer). Each water type has a different signature of isotope values. The oxygen and hydrogen isotope results are presented in Table 6. The oxygen isotope values for the groundwater samples collected from the alluvium wells ranged from -2.1 to -8.1 delta units per parts per thousand, and the hydrogen isotopes ranged from -36.9 to -65.6 delta units per parts per thousand. The oxygen isotopes value for the groundwater sample collected from the Tulare Formation well was -8.8 delta units per parts per thousand, and the hydrogen isotopes was -66.7 delta units per parts per thousand. These values are similar to previous results (Table 6). As shown on Figure 4, the current isotope results for well 21MW-1 are similar to results for well 29MW-1. This is due to the produced water mixed with native groundwater migrating toward the northwest and away from the former impoundments. 4.3 Soil Moisture The soil samples collected on April 23, 2019, indicated a soil moisture content of 10.3 percent for the 1 to 1.5 foot sample and 12.3 percent for the 2.5 to 3 foot sample. The 2019 soil moisture content was




compared with previous data, results of the 2008 vadose zone modeling performed as part of the Closure Plan Addendum (Geomatrix, 2008; AMEC Geomatrix, 2008), and field density tests performed in 2009 during closure construction. The 2019 soil moisture is within the range of previous data and the 2008 modeling, indicating that water is not infiltrating through the final cover and upper portions of the backfill material. Soil moisture data are summarized in Table 7. The laboratory analytical report and chain-of-custody record for the 2019 annual soil monitoring event are included in Appendix B. 4.4 Impoundment Cover Inspection Chevron personnel performed post-storm inspections of the impoundment cover on October 2, 2018, and March 12, 2019, following significant rain events in the vicinity of the impoundments. A Wood Principal Engineer reviewed the post-storm inspection documents provided by Chevron after each rain event and prepared recommendations for erosion repair. The repairs were implemented by Chevron personnel in November 2018 and April 2019, respectively. In December 2018 after the rainy season began, Chevron personnel re-seeded areas of the impoundment cover where vegetation was sparse. Chevron personnel also performed an annual inspection the cover of the closed impoundments on August 20, 2019. The inspection included photographing the impoundment cover and looking for evidence of erosion, ponding, or other degradation of the cover, as well as noting the condition of the vegetative cover. Inspection and repair documentation from Chevron and Wood is provided in Appendix D. Chevron plans to re-seed several areas of the impoundment cover where vegetation is sparse. The re-seeding is planned for November or December 2019, after the rainy season has begun.

5.0 Financial Assurance Review The WDRs require an annual review of the financial assurance mechanism and estimated costs for 30 years of post-closure maintenance and monitoring in order to meet the funding requirements for waste units regulated by the RWQCB. The 2019 annual review is described in the following subsections. 5.1 Monitoring and Reporting Costs Post-closure monitoring and reporting costs include:

• annual groundwater monitoring of seven wells,

• annual soil moisture sampling of the former impoundment cover,

• laboratory analysis of the groundwater and soil samples for the constituents specified in the WDRs,

• performing an annual engineering inspection of the former impoundment cover and preparing a report of repairs (if needed), as specified in the WDRs, and

• preparing an annual post-closure monitoring report for submission to the RWQCB.




5.2 Maintenance Costs Post-closure maintenance costs include intermittent activities not performed annually. For purposes of this cost estimate, Wood assumed that each of the following activities would occur twice during the 30-year post-closure period:

• performing repairs of any damage to the former impoundment cover and reseeding the cover,

• rehabilitating/redeveloping the monitoring wells, and

• replacing the dedicated pump and tubing systems in the monitoring wells.

5.3 Summary of Estimated Costs Estimated costs for 30 years of post-closure maintenance and monitoring at the former impoundments are provided in Table 8. The total estimated cost is $826,499.37 in 2019 dollars. This estimate of post-closure maintenance and monitoring cost is adequately covered by the existing Irrevocable Standby Letter of Credit (U.S. Bank Letter of Credit No. SLCMMSP07892), issued in the amount of $850,000, to cover the post-closure maintenance and monitoring activities, in accordance with the WDRs.

6.0 Summary of 2019 Post-Closure Activities Chevron completed closure of the former impoundments in March 2009, and a Closure Report was submitted to the RWQCB in March 2009 (AMEC Geomatrix, 2009). The closure was approved by the RWQCB in an August 2010 approval letter (RWQCB, 2010). The approval letter also specified post-closure activities including annual groundwater monitoring, annual soil sampling, and annual reporting. Post-closure activities performed in 2019 are summarized in the following subsections. Groundwater Monitoring Well Network The groundwater monitoring well network at the former impoundments (Figure 2) is effective for monitoring groundwater conditions in the vicinity of the former impoundments and the nature and extent of the produced water mixed with groundwater downgradient of the former impoundments in both the Basal Alluvial Sand and the Tulare Formation. Of the downgradient wells, wells 29MW-2 and 21MW-1 are located along the axis of the produced water plume and wells 21MW-2 and 21MW-3 are located cross-gradient of the plume. Well 21MW-1 is located at the toe of the plume. Wells 21MW4 and 21MW-5 are the current sentinel wells located to the northeast, downgradient of the toe of the plume (Figure 2). Produced Water Plume The plume of produced water mixed with groundwater downgradient of the former impoundments is slowly migrating in the Basal Alluvial Sand away from the former impoundments, as noted on the time concentration charts in Appendix C. The analytical results indicate that the produced water from the former impoundments is contained within the Basal Alluvial Sand and has not migrated downward into the Tulare Formation. Compliance with the Monitoring and Reporting Program Groundwater monitoring in 2019 was performed in conformance with the WDRs and MRP. The results of monitoring performed in 2019 demonstrate compliance with requirements of the WDRs.




7.0 Future Post-Closure Monitoring Activities Annual post-closure groundwater monitoring and soil moisture monitoring will be performed in April 2020. The cover of the former impoundments will be inspected before September 30, 2020, in accordance with the MRP. The annual 2020 post-closure monitoring report will be submitted to the RWQCB by October 31, 2020.

8.0 References AMEC Environment & Infrastructure, 2013, Sampling and Analysis Plan, Former Section 29 Surface

Impoundments, Lost Hills, California, July 31 (AMEC, 2013a).

AMEC Environment & Infrastructure, 2013, Water Quality Monitoring Plan, Former Section 29 Surface Impoundments, Lost Hills, California, July 31 (AMEC, 2013b).

AMEC Environment & Infrastructure, 2013, Post-Closure Maintenance and Monitoring Plan, Former Section 29 Surface Impoundments, Lost Hills, California, July 31 (AMEC, 2013c).

AMEC Geomatrix, Inc., 2008, Closure Plan Addendum II, Section 29 Surface Impoundments, Lost Hills Oil Field, Kern County, California, August 19 (AMEC Geomatrix, 2008).

AMEC Geomatrix, Inc., 2009, Closure Report, Section 29 Surface Impoundments, Lost Hills, California, March 30 (AMEC Geomatrix, 2009).

California Regional Water Quality Control Board, 2003, Standard Provisions and Reporting Requirements, Industrial Facilities for Title 27, September (RWQCB, 2003).

California Regional Water Quality Control Board, 2007, Groundwater Corrective Action Plan, Section 29 Surface Impoundments, Lost Hills Oil Field, Kern County, March 7 (RWQCB, 2007).

California Regional Water Quality Control Board, 2010, Closure – Section 29 Surface Impoundments, Lost Hills Oil Field, Kern County, August 4 (RWQCB, 2010).

California Regional Water Quality Control Board, 2013, Waste Discharge Requirements Order No. R5-2013-0056, Chevron USA, Inc., Former Section 29 Surface Impoundments, Lost Hills Oil Field, Kern County, May 31 (RWQCB, 2013a).

California Regional Water Quality Control Board, 2013, Review of Sampling and Analysis Plan, Former Section 29 Surface Impoundments, Lost Hills Oil Field, Kern County, August 27 (RWQCB, 2013b).

California Regional Water Quality Control Board, 2013, Review of Water Quality Monitoring Plan, Former Section 29 Surface Impoundments, Lost Hills Oil Field, Kern County, August 28 (RWQCB, 2013c).

California Regional Water Quality Control Board, 2013, Review of Post-Closure Maintenance and Monitoring Plan, Former Section 29 Surface Impoundments, Lost Hills Oil Field, Kern County, September 18 (RWQCB, 2013d).

Geomatrix Consultants, Inc., 2004, Additional Groundwater Investigation and Monitoring Well Installation, Section 29 Percolation Ponds, Lost Hills, California, December 16 (Geomatrix, 2004).

Geomatrix Consultants, Inc., 2006, Groundwater Corrective Action Plan, Section 29 Surface Impoundments, Lost Hills, California, June 30 (Geomatrix, 2006).

Geomatrix Consultants, Inc., 2008, Closure Plan Addendum, Section 29 Surface Impoundments, Lost Hills, California, June 20 (Geomatrix, 2008).

Table 1Well Construction Summary

Former Section 29 Surface ImpoundmentsLost Hills, California

Date Total DepthCasing

Diameter Slot SizeScreened Interval

Ground Surface Elevation

Top of Casing Elevation

Well1 Completed (feet bgs)2 (inches)3 (inches)3 (feet bgs)2 (feet NAVD88)4 (feet NAVD88)4

21MW-1 08/31/04 277 4 0.02 260 - 270 290.70 293.3921MW-2 09/09/04 260 4 0.02 240 - 260 290.10 292.5121MW-3 09/21/04 310 4 0.02 284 - 304 294.80 297.3721MW-4 11/21/14 350.3 4 0.02 320.7 - 349.9 282.80 285.1121MW-5 11/12/14 595.4 4 0.02 565.8 - 595.0 282.90 284.7429MW-1 12/19/00 204 5 0.02 106 - 136 363.20 365.7829MW-2 08/23/07 180.6 4 0.02 159.9 - 179.5 332.20 333.20

1. Well locations are shown on Figure 2.2. Total depth of well and depth of top and bottom of screened interval in feet below ground surface (bgs).3. Diameter of casing and size of slotted screen in inches. Section 21 wells were constructed of Schedule 80 polyvinyl chloride (PVC) casing.4. Surveyed elevation of ground surface and top of PVC casing in feet referencing North American Vertical Datum 1988 (NAVD88).

Wells were surveyed in 2007 by Berry & Associates Land Surveying and in 2014 by Nelms Surveying, Inc.

Page 1 of 1I:\7000s\7580.000\Archive\7580-192

Table 2Depth to Groundwater and Groundwater Elevation Data


21MW-1 09/24/04 293.39 63.99 229.4010/06/04 64.10 229.2902/07/06 63.74 229.6505/19/06 63.18 230.2108/03/06 63.55 229.8411/02/06 63.65 229.7402/15/07 63.47 229.9205/17/07 63.51 229.8808/02/07 64.04 229.3511/01/07 64.14 229.2502/07/08 64.54 228.8505/15/08 65.21 228.1808/19/08 65.43 227.9611/20/08 66.08 227.3102/05/09 66.31 227.0805/15/09 66.89 226.5008/06/09 67.00 226.3905/06/10 68.20 225.1905/25/11 68.44 224.9505/07/12 69.00 224.3911/27/12 69.81 223.5805/02/13 71.00 222.3904/30/14 71.80 221.5904/21/15 72.33 221.0604/14/16 73.55 219.8404/25/17 75.48 217.9104/23/18 74.58 218.8104/22/19 75.93 217.46

21MW-2 09/24/04 292.51 62.64 229.8710/06/04 62.79 229.7202/07/06 62.37 230.1405/19/06 61.81 230.7008/03/06 62.03 230.4811/02/06 62.30 230.21

GroundwaterElevation

(feet NAVD88)2Well1 Date


(feet NAVD88)2

Depth to Groundwater (feet btoc)3






(feet NAVD88)2


21MW-2 02/15/07 292.51 62.12 230.39(cont.) 05/17/07 62.15 230.36

08/02/07 62.67 229.8411/01/07 62.84 229.6702/07/08 63.16 229.3505/15/08 63.82 228.6908/19/08 64.08 228.4311/20/08 nm nm02/05/09 65.35 227.1605/15/09 65.82 226.6908/06/09 66.00 226.5105/06/10 67.00 225.5105/25/11 67.37 225.1405/07/12 67.83 224.6811/27/12 68.68 223.8305/02/13 69.77 222.7404/30/14 70.53 221.9804/21/15 71.31 221.2004/14/16 72.43 220.0804/25/17 73.32 219.1904/23/18 73.44 219.0704/22/19 74.84 217.67

21MW-3 09/24/04 297.37 68.91 228.4610/06/04 68.98 228.3902/07/06 68.56 228.8105/19/06 67.95 229.4208/03/06 68.22 229.1511/02/06 68.25 229.1202/15/07 68.23 229.1405/17/07 68.22 229.1508/02/07 68.76 228.6111/01/07 68.86 228.5102/07/08 69.27 228.1005/15/08 69.89 227.4808/19/08 70.14 227.2311/20/08 70.76 226.6102/05/09 71.00 226.3705/15/09 71.58 225.79






(feet NAVD88)2


21MW-3 08/06/09 297.37 71.60 225.77(cont.) 05/06/10 72.70 224.67

05/25/11 72.90 224.4705/07/12 73.78 223.5911/27/12 74.26 223.1105/02/13 75.78 221.5904/30/14 76.35 221.0204/21/15 76.53 220.8404/14/16 77.64 219.7304/25/17 78.58 218.7904/23/18 78.61 218.7604/22/19 79.94 217.43

21MW-4 11/25/14 285.11 55.00 230.1104/21/15 64.94 220.1704/14/16 65.79 219.3204/25/17 66.78 218.3304/23/18 66.68 218.4304/22/19 68.27 216.84

21MW-5 11/19/14 284.74 274.84 9.9004/21/15 273.82 10.9204/14/16 280.11 4.6304/25/17 280.59 4.1504/23/18 279.06 5.6804/22/19 286.82 -2.08

29MW-1 10/06/04 365.78 96.12 269.6602/07/06 98.07 267.7105/19/06 97.93 267.8508/03/06 98.02 267.7611/02/06 98.29 267.4902/15/07 98.70 267.0805/17/07 98.07 267.7108/02/07 98.00 267.7811/01/07 98.50 267.2802/07/08 98.87 266.9105/15/08 98.99 266.7908/19/08 100.32 265.4611/20/08 101.77 264.01






(feet NAVD88)2


29MW-1 02/05/09 365.78 102.87 262.91(cont.) 05/15/09 104.54 261.24

08/06/09 106.00 259.7805/06/10 110.00 255.7805/25/11 114.93 250.8505/07/12 119.30 246.4811/27/12 123.74 242.0405/02/13 127.09 238.6904/30/14 130.11 235.6704/21/15 132.24 233.5404/14/16 134.16 231.6204/25/17 Dry Dry04/23/18 Dry Dry04/22/19 Dry Dry

29MW-2 11/01/07 333.20 86.40 246.8002/07/08 86.58 246.6205/15/08 87.16 246.0408/19/08 87.83 245.3711/20/08 88.76 244.4402/05/09 89.60 243.6005/15/09 90.63 242.5708/06/09 91.49 241.7105/06/10 94.00 239.2005/25/11 96.28 236.9205/07/12 97.80 235.4011/27/12 100.20 233.0005/02/13 100.21 232.9904/30/14 101.70 231.5004/21/15 103.15 230.0504/14/16 105.18 228.0204/25/17 106.61 226.5904/23/18 107.45 225.7504/22/19 108.70 224.50

Endnotes provided on the next page.



1. Well locations are shown on Figure 2.2. Surveyed elevation of the top of the well casing and groundwater elevation in feet referencing North American

Vertical Datum 1988 (NAVD88). Wells 21MW-1, 21MW-2, 21MW-3, 29MW-1, and 29MW-2 were surveyedin 2007 by Berry & Associates Land Surveying. Wells 21MW-4 and 21MW-5 were surveyed in 2014 byNelms Surveying, Inc.

3. Depth to groundwater measured in feet below the top of casing (btoc).


Table 3Purge and Field Parameter Data


Well1 Date Time (mL)2 (°C)3 (s.u.)4 (µmhos/cm)5 Comments21MW-1 04/22/19 10:52 1,440 22.0 6.86 12,900 clear

10:59 2,880 22.1 6.93 12,920 clear11:06 4,320 22.1 6.99 12,930 clear11:13 5,760 22.1 7.00 12,940 clear, sample

21MW-2 04/22/19 11:42 1,369 23.0 6.78 3,753 clear11:49 2,738 23.0 7.26 3,740 clear11:56 4,107 23.0 7.32 3,748 clear12:02 5,476 22.9 7.43 3,749 clear, sample




29MW-1 04/22/19 Well was dry29MW-2 04/22/19 12:30 989 22.7 6.51 20,720 clear

12:37 1,978 22.9 6.45 20,680 clear12:44 2,967 22.9 6.38 20,610 clear12:51 3,956 22.7 6.36 20,590 clear, sample

1. Well locations are shown on Figure 2. 2. Cumulative water purged reported in milliliters (mL).3. Temperature in degrees Celsius (°C).4. pH recorded in standard pH units (s.u.).5. Electrical conductivity (EC) measured in micromhos per centimeter (µmhos/cm).

Temperature pH ECCumulative

Purged


Table 4Laboratory Analytical Results


Inorganics and General Chemistry (mg/L)2 Petroleum Hydrocarbons4 (µg/L)Alkalinity (as CaCO3)

Date Boro

n

Pota

ssiu

m

Tota

l

Bica

r-bo

nate

Carb

onat

e

Hydr

oxid

e

Chlo

ride

Nitra

te-N

Sulfa

te

TDS

Benz

ene

Tolu

ene

o-Xy

lenes

21MW-1 10/06/04 4.8 480 160 11 840 140 170 ND na 1,510 0.32 1,680 4,100 na ND 0.34 ND na ND ND02/08/06 7.9 680 250 15 1,100 160 160 <2.0 <2.0 2,200 <0.75 1,700 8,500 9,200 <2.0 0.53 J <2.0 <2.0 0.71 J ND05/19/06 8.9 840 290 15 1,200 170 170 <2.0 <2.0 2,700 <1.13 1,900 7,500 10,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/03/06 8.4 870 290 15 1,100 170 170 <2.0 <2.0 2,900 <1.13 2,100 8,600 10,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND11/02/06 10 900 320 15 1,200 180 180 <2.0 <2.0 3,100 <0.11 1,900 8,600 11,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND02/15/07 9.8 890 290 16 1,200 170 170 <2.0 <2.0 3,000 <0.11 1,900 9,300 11,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/17/07 11 930 310 17 1,200 180 180 <2.0 <2.0 3,100 <0.11 1,900 11,000 12,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/02/07 11 920 310 18 1,400 200 200 <2.0 <2.0 3,400 <1.1 1,900 8,900 12,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND11/01/07 12 1,000 350 20 1,400 170 170 <2.0 <2.0 3,300 <1.1 1,800 9,000 12,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND02/07/08 12 930 340 18 1,500 180 180 <2.0 <2.0 3,500 <2.2 1,900 8,900 12,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/15/08 12 970 330 19 1,400 200 200 <2.0 <2.0 3,200 <1.1 1,900 9,000 12,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/19/08 12 940 340 18 1,400 200 200 <2.0 <2.0 3,300 <0.11 1,800 10,000 13,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND11/20/08 11 940 320 18 1,700 200 200 <2.0 <2.0 4,300 <1.1 2,100 11,000 13,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND02/05/09 15 1,100 400 19 1,700 190 190 <2.0 <2.0 3,400 <1.1 1,900 11,000 13,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/15/09 14 1,200 410 21 1,700 210 210 <2.0 <2.0 3,500 <0.22 2,000 11,000 15,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/06/09 14 1,100 390 20 1,600 200 200 <2.0 <2.0 3,800 <0.55 1,900 12,000 14,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/06/10 15 1,100 360 20 1,700 200 200 <2.0 <2.0 3,900 <2.2 1,900 12,000 15,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/25/11 18 1,300 420 20 1,900 210 210 <2.0 <2.0 4,600 <1.1 2,400 13,000 11,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/07/12 18 1,300 400 18 1,900 220 220 <4.0 <4.0 4,700 <10 1,800 13,000 17,000 <2.0 <2.0 <2.0 <2.0 <2.0 Naphthalene 0.4 J11/27/12 20 1,200 450 18 1,800 220 220 <4.0 <4.0 4,800 <25 2,500 14,000 15,000 <2.0 <2.0 <2.0 <2.0 <2.0 Methylene Chloride 2.8 J

Naphthalene 0.42 J123-TCB 0.31 J

05/02/13 21 1,300 450 19 2,100 220 220 <4.0 <4.0 4,800 <25 2,200 13,000 18,000 <2.0 <2.0 <2.0 <2.0 <2.0 Ethanol 220 N-MT-Formamide 3.8 TJN1-M-3-P-1H-Indene 5.4 TJN

04/30/14 22 1,300 370 18 2,000 240 240 <4.0 <4.0 4,700 <2.26 2,100 13,000 17,000 <2.0 <2.0 0.26 J <2.0 <2.0 Acetone 4.7 J04/21/15 21 1,400 B 420 20 2,400 250 250 <4.0 <4.0 5,400 1.42 2,000 14,000 19,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND04/14/16 26 1,400 530 20 2,400 250 250 <4.0 <4.0 5,300 4.07 J 2,300 14,000 17,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND04/28/17 22 1,300 450 18 2,400 250 250 <4.0 <4.0 5,400 1.74 J 2,200 14,000 17,000 <2.0 <2.0 <2.0 <2.0 <2.0 Unknown 2.6 TJ04/23/18 24 1,200 B 440 17 2,100 250 250 <4.0 <4.0 5,800 1.45 J 2,200 15,000 19,000 <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (3 TICs) 2.7 to 11 TJ04/22/19 24 1,200 B 420 17 2,100 B 260 260 <4.0 <4.0 5,400 <5.65 2,200 13,000 18,000 <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (3 TICs) 2.6 to 12 TJ

D 04/22/19 24 1,200 B 420 18 2,100 B 260 260 <4.0 <4.0 5,500 <5.65 2,200 13,000 18,000 <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (1 TIC) 9.7 TJ

Calci

um

Sodi

um

Well1Groundwater Monitoring

Ethy

lben

zene

m,p

-Xyle

nes

Mag

nesiu

m

EC3

(µm

hos/

cm)

Tentatively Identified Compounds5

(µg/L)




Date Boro

n

Pota

ssiu

m

Tota

l

Bica

r-bo

nate

Carb

onat

e

Hydr

oxid

e

Chlo

ride

Nitra

te-N

Sulfa

te

TDS

Benz

ene

Tolu

ene

o-Xy

lenes

Calci

um

Sodi

um

Well1 Ethy

lben

zene

m,p

-Xyle

nes

Mag

nesiu

m

EC3

(µm

hos/

cm)


(µg/L)21MW-2 10/06/04 4.0 300 94 45 920 100 73 24 na 1,160 0.39 1,540 4,000 na ND ND ND na ND ND

02/07/06 4.7 290 110 8.9 770 130 130 <2.0 <2.0 1,000 0.67 1,600 3,500 5,500 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/19/06 5.0 310 100 13 870 120 120 <2.0 <2.0 950 1.3 1,500 3,900 5,600 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/03/06 4.5 310 98 10 800 120 120 <2.0 <2.0 1,000 1.3 1,700 4,000 5,600 <2.0 <2.0 <2.0 <2.0 <2.0 ND11/02/06 4.9 320 100 9.3 830 110 110 <2.0 <2.0 1,100 1.4 1,500 3,700 5,700 <2.0 <2.0 <2.0 <2.0 <2.0 ND02/15/07 4.9 300 100 9.5 840 110 110 <2.0 <2.0 1,100 2.3 1,500 3,900 5,500 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/17/07 5.0 300 100 11 840 120 120 <2.0 <2.0 960 1.4 1,400 4,200 5,700 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/02/07 4.9 280 99 11 780 130 130 <2.0 <2.0 1,000 1.7 1,500 4,200 5,400 <2.0 <2.0 <2.0 <2.0 <2.0 ND11/01/07 5.1 310 110 11 880 96 96 <2.0 <2.0 990 0.88 1,400 4,100 5,400 <2.0 <2.0 <2.0 <2.0 <2.0 ND02/07/08 4.7 300 110 11 870 120 120 <2.0 <2.0 980 0.80 J 1,500 3,900 5,500 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/15/08 4.7 290 100 10 840 120 120 <2.0 <2.0 990 0.66 1,500 3,800 5,400 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/19/08 4.2 260 91 11 820 120 120 <2.0 <2.0 950 0.83 1,500 3,900 5,300 <2.0 <2.0 <2.0 <2.0 <2.0 ND11/20/08 ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns02/05/09 4.9 310 110 10 870 120 120 <2.0 <2.0 870 0.38 J 1,400 3,900 5,200 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/15/09 4.5 300 110 11 880 130 130 <2.0 <2.0 910 0.68 1,400 3,900 5,300 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/06/09 4.6 280 110 11 890 120 120 <2.0 <2.0 910 0.85 1,400 4,000 5,200 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/06/10 4.6 290 98 11 870 120 120 <2.0 <2.0 970 <0.55 1,400 3,900 5,200 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/25/11 4.9 310 100 9.8 820 140 140 <2.0 <2.0 800 0.57 1,400 3,800 4,700 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/07/12 4.4 320 94 10 860 120 120 <4.0 <4.0 920 <5.0 1,500 3,800 5,200 <2.0 <2.0 <2.0 <2.0 <2.0 ND11/27/12 5.0 280 110 9.4 710 120 120 <4.0 <4.0 880 <5.0 1,500 4,100 4,700 <2.0 <2.0 <2.0 <2.0 <2.0 Methylene Chloride 2.7 J05/02/13 5.0 310 100 11 790 120 120 <4.0 <4.0 870 <5.0 1,400 3,900 5,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND04/30/14 4.7 280 95 9.7 770 ^ 130 130 <4.0 <4.0 960 <0.56 1,600 3,900 4,900 <2.0 <2.0 <2.0 <2.0 <2.0 ND04/21/15 4.2 260 B 84 9.4 750 140 140 <4.0 <4.0 880 0.32 1,300 3,700 5,600 <2.0 <2.0 <2.0 <2.0 <2.0 3-butyl-1-methyl-1H-Inden 14 TJN04/14/16 5.4 310 120 12 910 130 130 <4.0 <4.0 870 0.88 J 1,400 4,000 5,300 <2.0 <2.0 <2.0 <2.0 <2.0 ND04/28/17 4.5 290 95 10 800 130 130 <4.0 <4.0 1,000 0.29 J 1,700 3,900 5,100 <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (2 TICs) 3.1 to 6.6 TJ04/23/18 4.3 260 B 91 11 680 120 120 <4.0 <4.0 870 <0.56 1,500 3,800 5,400 <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (3 TICs) 3.4 to 11 TJ04/22/19 4.7 270 B 92 11 720 ^B 130 130 <4.0 <4.0 910 0.84 J 1,500 3,900 5,400 <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (3 TICs) 3.9 to 12 TJ

21MW-3 10/08/04 4.2 340 100 8.4 690 150 180 ND na 934 ND 1,530 3,860 na ND ND ND na ND ND02/09/06 4.4 310 100 8.2 620 130 130 <2.0 <2.0 860 <0.75 1,500 2,200 5,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/19/06 4.4 330 100 8.6 760 120 120 <2.0 <2.0 850 <1.13 1,400 3,200 5,200 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/03/06 4.2 340 100 9.8 700 130 130 <2.0 <2.0 930 <0.56 1,600 3,800 5,100 <2.0 <2.0 <2.0 <2.0 <2.0 ND11/02/06 4.4 320 100 9.2 700 130 130 <2.0 <2.0 960 <0.11 1,500 3,700 5,200 <2.0 <2.0 <2.0 <2.0 <2.0 ND02/15/07 4.5 320 99 8.4 740 120 120 <2.0 <2.0 1,000 <0.11 1,500 3,700 5,100 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/17/07 4.6 330 100 9.2 730 120 120 <2.0 <2.0 900 <0.11 1,400 4,000 5,400 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/02/07 4.4 320 100 9.5 710 140 140 <2.0 <2.0 920 <0.55 1,300 3,900 5,200 <2.0 <2.0 <2.0 <2.0 <2.0 ND




Date Boro

n

Pota

ssiu

m

Tota

l

Bica

r-bo

nate

Carb

onat

e

Hydr

oxid

e

Chlo

ride

Nitra

te-N

Sulfa

te

TDS

Benz

ene

Tolu

ene

o-Xy

lenes

Calci

um

Sodi

um

Well1 Ethy

lben

zene

m,p

-Xyle

nes

Mag

nesiu

m

EC3

(µm

hos/

cm)


(µg/L)21MW-3 11/01/07 4.7 340 110 10 830 120 120 <2.0 <2.0 880 <1.1 1,400 3,900 5,200 <2.0 <2.0 <2.0 <2.0 <2.0 ND

02/07/08 4.3 330 110 9.5 710 120 120 <2.0 <2.0 910 <1.1 1,400 3,900 5,300 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/15/08 4.3 320 110 8.9 750 120 120 <2.0 <2.0 860 <1.1 1,400 3,800 4,900 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/19/08 4.0 280 94 9.1 700 120 120 <2.0 <2.0 880 <0.11 1,500 3,700 5,200 <2.0 <2.0 <2.0 <2.0 <2.0 ND11/20/08 3.9 310 96 9.6 830 130 130 <2.0 <2.0 920 <1.1 1,500 3,900 5,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND02/05/09 4.6 350 110 8.9 780 110 110 <2.0 <2.0 860 <1.1 1,500 3,700 5,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/15/09 4.0 320 110 9.9 780 130 130 <2.0 <2.0 900 <0.11 1,500 3,800 5,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/06/09 4.3 310 110 9.9 780 120 120 <2.0 <2.0 890 <0.22 1,400 3,600 5,200 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/06/10 4.3 310 100 9.6 780 130 130 <2.0 <2.0 930 <1.1 1,500 3,800 5,200 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/25/11 4.7 350 110 9.1 770 130 130 <2.0 <2.0 840 <0.55 1,600 3,800 4,700 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/07/12 4.3 350 100 8.8 760 130 130 <4.0 <4.0 910 <5.0 1,500 3,700 5,200 <2.0 <2.0 <2.0 <2.0 <2.0 ND11/27/12 4.7 350 110 9.1 700 120 120 <4.0 <4.0 900 <5.0 1,500 4,100 4,600 <2.0 <2.0 <2.0 <2.0 <2.0 Methylene Chloride 2.0 J05/02/13 4.6 320 110 8.5 670 120 120 <4.0 <4.0 860 <5.0 1,400 3,900 5,000 <2.0 <2.0 <2.0 <2.0 <2.0 Unknown 4.6 TJ04/30/14 4.3 300 99 7.8 650 130 130 <4.0 <4.0 930 <0.56 1,600 3,900 4,800 <2.0 <2.0 <2.0 <2.0 <2.0 Anthranilic acid 2.6 TJN04/21/15 4.0 340 B 94 8.6 720 130 130 <4.0 <4.0 980 <0.11 1,300 3,700 5,400 <2.0 <2.0 <2.0 <2.0 <2.0 ND04/14/16 5.9 400 150 11 950 130 130 <4.0 <4.0 880 <1.13 1,500 3,800 5,200 <2.0 <2.0 <2.0 <2.0 <2.0 ND04/28/17 4.0 310 97 7.9 710 130 130 <4.0 <4.0 890 <0.56 1,600 F1 3,900 5,100 <2.0 <2.0 <2.0 <2.0 <2.0 ND04/23/18 4.4 310 B 98 8.1 640 120 120 <4.0 <4.0 970 <0.056 1,500 3,800 5,300 <2.0 <2.0 <2.0 <2.0 <2.0 ND04/22/19 4.3 300 B 92 7.8 620 B 130 130 <4.0 <4.0 870 <1.13 1,500 3,800 5,300 <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (2 TICs) 3.1 to 6.7 TJ

21MW-4 11/25/14 4.4 310 90 7.5 720 120 120 <4.0 <4.0 780 <0.56 1,200 3,800 5,700 <2.0 5.7 <2.0 <2.0 <2.0 Carbon disulfide 0.66 JB2-methyl-2-propanol 9.5 J

04/30/15 4.4 320 96 10 810 150 150 <4.0 <4.0 920 <0.56 1,400 3,900 5,300 <2.0 <2.0 <2.0 <2.0 <2.0 Vinyl chloride 0.45 J04/14/16 5.4 360 130 10 930 140 140 <4.0 <4.0 910 0.81 J 1,500 4,100 5,400 <2.0 <2.0 <2.0 <2.0 <2.0 ND04/25/17 4.3 310 90 8.1 800 B 130 130 <4.0 <4.0 830 <1.13 1,700 3,900 5,700 <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (3 TICs) 7.2 to 12 TJ04/23/18 4.1 290 B 92 7.5 680 130 130 <4.0 <4.0 890 <0.56 1,500 4,100 5,500 <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (3 TICs) 3.7 to 11 TJ

(WWQC) 12/05/18 4.1 330 100 8.1 800 130 130 <3.0 <3.0 1,000 0.24 1,600 3,700 na na na na na na na04/22/19 4.4 300 B 94 7.3 720 ^B 130 130 <4.0 <4.0 940 <1.13 1,600 4,000 5,500 <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (2 TICs) 8.3 to 26 TJ

(WWQC) 06/25/19 na na na na na na na na na na <1.1 na na na na na na na na na

21MW-5 11/21/14 3.1 280 56 4.4 500 77 77 <4.0 <4.0 480 <0.56 1,600 2,900 4,200 <2.0 3.8 <2.0 <2.0 <2.0 ND04/30/15 3.4 270 65 5.4 540 88 88 <4.0 <4.0 400 <0.23 1,400 2,900 3,800 <2.0 0.88 J <2.0 <2.0 <2.0 Vinyl chloride 0.47 J04/14/16 3.4 250 69 10 560 83 82 <4.0 <4.0 430 <0.56 1,400 2,900 3,900 <2.0 0.49 J <2.0 <2.0 <2.0 ND04/25/17 3.0 220 55 9.8 540 B 45 45 <4.0 <4.0 390 0.2 J 1,400 2,800 3,900 <2.0 2.1 <2.0 <2.0 <2.0 Unknown (3 TICs) 2.9 to 11 TJ04/23/18 3.1 230 B 57 5.8 470 82 82 <4.0 <4.0 410 <0.056 1,500 2,900 3,800 <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (3 TICs) 3.3 to 11 TJ04/22/19 3.3 230 B 57 8.2 490 ^B 76 76 <4.0 <4.0 410 <0.56 1,400 2,900 3,900 <2.0 1.5 J <2.0 <2.0 <2.0 Unknown (3 TICs) 8.1 to 9.3 TJ




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(µg/L)29MW-1 10/08/04 6.6 1,200 430 9.5 1,600 97 120 ND na 4,670 ND 2,410 12,900 na ND ND ND na ND ND

02/09/06 6.7 1,100 360 9.7 1,500 120 120 <2.0 <2.0 3,800 18 2,100 8,200 16,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/19/06 6.0 1,100 360 9.0 1,600 86 86 <2.0 <2.0 4,100 19 2,200 12,000 15,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/03/06 6.0 1,200 370 11 1,600 84 84 <2.0 <2.0 4,300 18 2,400 13,000 14,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND11/02/06 7.5 1,300 420 11 1,900 68 68 <2.0 <2.0 5,500 16 2,200 13,000 15,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND02/15/07 6.4 1,100 370 10 1,700 80 80 <2.0 <2.0 4,300 28 2,200 13,000 14,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/17/07 6.8 1,200 390 12 1,700 84 84 <2.0 <2.0 4,300 17 2,200 15,000 17,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/02/07 6.9 1,200 400 11 1,800 86 86 <2.0 <2.0 4,600 25 2,200 12,000 16,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND11/01/07 7.0 1,200 400 14 1,900 96 96 <2.0 <2.0 4,400 17 2,200 11,000 16,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND02/07/08 7.1 1,200 410 12 1,900 80 80 <2.0 <2.0 4,300 16 2,100 11,000 15,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/15/08 6.9 1,200 380 14 1,800 84 84 <2.0 <2.0 4,000 15 2,100 12,000 14,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/19/08 6.9 1,200 400 11 1,900 92 92 <2.0 <2.0 4,400 17 2,300 12,000 16,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND11/20/08 6.2 1,100 360 11 1,900 88 88 <2.0 <2.0 4,600 21 2,400 12,000 16,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND02/05/09 7.0 1,100 390 10 1,800 96 96 <2.0 <2.0 3,500 16 2,000 12,000 15,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/15/09 6.8 1,300 450 12 2,100 76 76 <2.0 <2.0 3,700 18 2,100 11,000 16,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND08/06/09 6.6 1,100 400 15 1,800 64 64 <2.0 <2.0 3,900 20 2,100 12,000 15,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/06/10 6.5 1,100 370 13 1,700 80 80 <2.0 <2.0 3,900 21 2,200 12,000 7,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/25/11 6.9 1,200 390 9.6 1,700 96 96 <2.0 <2.0 3,600 14 2,100 12,000 9,600 <2.0 <2.0 <2.0 <2.0 <2.0 ND05/07/12 6.6 1,200 340 8.9 1,500 80 80 <4.0 <4.0 3,500 53 2,100 10,000 13,000 <2.0 <2.0 <2.0 <2.0 <2.0 ND11/27/12 6.5 880 270 8.9 1,200 72 72 <4.0 <4.0 2,600 36 2,400 6,500 9,000 <2.0 <2.0 <2.0 <2.0 <2.0 Methylene Chloride 2.8 J05/02/13 5.5 680 160 7.9 990 72 72 <4.0 <4.0 1,800 3.8 2,200 7,000 8,300 <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (3 TICs) 5.9 to 12 TJ04/30/14 5.5 730 140 8.8 1,200 76 76 <4.0 <4.0 1,500 1.81 J 2,000 6,500 7,800 <2.0 <2.0 <2.0 <2.0 <2.0 113T-1H-Indene 3.5 TJN04/21/15 Water level below pump intake - no sample was collected04/14/16 Water level below pump intake - no sample was collected04/28/17 Well dry04/23/18 Well dry04/22/19 Well dry

29MW-2 11/01/07 39 2,300 860 33 5,200 380 380 <2.0 <2.0 12,000 27 2,000 26,000 52,000 30 <2.0 <2.0 3.2 <2.0 Ethanol 150 02/07/08 43 2,300 920 34 5,600 460 460 <2.0 <2.0 12,000 20 2,200 25,000 42,000 43 <2.0 <2.0 3.6 <2.0 ND05/15/08 41 2,200 820 31 5,400 460 460 <2.0 <2.0 13,000 22 2,400 28,000 37,000 40 <2.0 <2.0 3.4 <2.0 ND08/19/08 44 2,000 810 27 5,800 450 450 <2.0 <2.0 13,000 21 2,300 31,000 48,000 46 <2.0 <2.0 3.8 <2.0 ND11/20/08 39 1,900 730 28 5,600 470 470 <2.0 <2.0 14,000 33 2,500 30,000 44,000 37 <2.0 <2.0 4.0 <2.0 ND02/05/09 50 1,900 780 34 5,400 510 510 <2.0 <2.0 11,000 13 2,400 27,000 43,000 44 <2.0 <2.0 3.9 <2.0 ND05/15/09 46 2,300 910 32 6,000 490 490 <2.0 <2.0 11,000 22 2,300 26,000 45,000 42 <2.0 <2.0 3.9 <2.0 ND08/06/09 45 1,700 700 32 5,500 520 520 <2.0 <2.0 11,000 16 2,400 29,000 43,000 40 <2.0 <2.0 3.3 <2.0 ND




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(µg/L)29MW-2 05/06/10 48 1,400 540 30 8,700 620 620 <2.0 <2.0 10,000 4.5 2,900 23,000 38,000 47 <2.0 <2.0 2.5 <2.0 ND(cont.) 05/25/11 50 1,400 520 25 5,000 610 610 <2.0 <2.0 8,300 <2.2 3,100 21,000 26,000 42 <2.0 <2.0 2.0 <2.0 ND

05/07/12 39 1,300 420 21 4,200 520 520 <4.0 <4.0 7,600 <25 2,600 18,000 30,000 33 <2.0 <2.0 1.0 J <2.0 Propene 3.0 2-methyl-2-propanol 55 Vinyl Chloride 0.46 J5,5D-1,3C 3.2 TJNNaphthalene 1.2 JUnknown (2 TICs) 3.0 to 3.9 TJ

11/27/12 49 1,200 500 23 4,100 580 580 <4.0 <4.0 7,900 <50 2,900 23,000 30,000 35 <2.0 <2.0 1.9 J <2.0 Propene 4.0 Vinyl Chloride 0.84 J*2-methyl-2-propanol 68Methylene Chloride 2.7 JIsopropylbenzene 0.40 JNaphthalene 1.5 J

05/02/13 36 1,200 450 21 3,700 520 520 <4.0 <4.0 7,700 8.4 J 2,800 20,000 32,000 27 <2.0 <2.0 2.0 <2.0 2-methyl-2-propanol 59 135-TMB 4.6 TJNNaphthalene 1.4 J1-M-Naphthalene 5.0 TJN2-M-Naphthalene 5.8 TJNUnknown (9 TICs) 4.9 to 75 TJ

04/30/14 44 1,700 530 24 4,700 630 630 <4.0 <4.0 10,000 <5.65 2,700 24,000 37,000 29 <2.0 <2.0 3.1 0.53 J Acetone 5.5 J2-methyl-2-propanol 66 5,5D-1,3C 12 TJN135-TMB 8.7 TJN4(1H)Pyrimidinone 18 TJN2-methyl-2-Nonene 9.2 TJN1-methyl-Indan 13 TJN2I-13D-Cyclopentane 12 TJN3-Ethyl-3-octene 5.7 TJNPulegone 6.1 TJN3E-5M-1P-Cyclohexane 10 TJNPICyclohexane 7.5 TJN44D-2-ACyclohexanone 6.8 TJN23D-56-D-1H-Indene 7.3 TJN246T-Benzaldehyde 6.1 TJN




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(µg/L)29MW-2 04/21/15 49 1,700 B 650 27 5,400 620 620 <4.0 <4.0 9,300 5.2 2,400 23,000 37,000 24 <2.0 <2.0 2.8 <2.0 Unknown (9 TICs) 4.1 to 11 TJ(cont.) 2-methyl-2-propanol 75

5,5D-1,3C 9.8 TJN135-TMB 6.6 TJN1-(3,4DMP)-Ethanone 5.8 TJN

04/14/16 58 1,700 770 27 4,400 610 610 <4.0 <4.0 9,400 10.84 J 2,700 23,000 35,000 20 <2.0 <2.0 2.8 <2.0 2-methyl-2-propanol 72 Unknown (11 TICs) 5.7 to 10 TJ1-(2,5DMP)-Ethanone 8.2 TJN1-M-Naphthalene 5.6 TJN

04/28/17 43 1,300 500 20 4,700 620 620 <4.0 <4.0 9,100 3.16 J 2,600 22,000 33,000 18 <2.0 <2.0 2.1 <2.0 Unknown (15 TICs) 4.9 to 12 TJ04/23/18 48 1,400 B 580 21 4,500 610 610 <4.0 <4.0 9,800 4.29 J 2,500 22,000 35,000 19 <2.0 <2.0 2.3 <2.0 5,5D-1,3C 10 TJN

Naphthalene 10 TJN1-(3,4DMP)-Ethanone 14 TJN12-DPCP 18 TJNUnknown (11 TICs) 9.7 to 19 TJ

04/22/19 45 1,400 B 530 22 4,300 ^B 620 620 <4.0 <4.0 9,800 <11.3 2,800 21,000 34,000 17 <2.0 <2.0 1.8 J 0.59 J 123-TMB 4.3 TJNUnknown (14 TICs) 3.3 to 11 TJ

04/22/19 na na na na na na na na na na na na na na <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (2 TICs) 8.2 to 23 TJEquipment Blank 04/22/19 na na na na na na na na na na na na na na <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (2 TICs) 8.2 to 30 TJTrip Blank 04/22/19 na na na na na na na na na na na na na na <2.0 <2.0 <2.0 <2.0 <2.0 Unknown (2 TICs) 8.1 to 23 TJ

1. Well locations are shown on Figure 2. D - duplicate sample. (WWQC) - sample collected from Chevron monitoring well by the Westside Water Quality Coalition.2. Dissolved boron, calcium, magnesium, potassium, and sodium analyzed using U.S. Environmental Protection Agency (EPA) Method 6010B. Total, bicarbonate, carbonate, and hydroxide alkalinity as calcium carbonate (CaCO3) analyzed using Standard Method 2320B.

Chloride, nitrate as nitrogen (N), and sulfate analyzed using EPA Method 300.0. Total dissolved solids (TDS) analyzed using EPA Method 160.1. Nitrate as N results were converted from Nitrate as Nitrate (NO3) by dividing the result by 4.4266. Results reportedin milligrams per liter (mg/L). ns - not sampled. ND - not detected. na - not analyzed for this constituent. < - less than the reporting limit as shown on the analytical data sheets. ^ - Calibration or MRL standard instrument-related QC exceeds control limits.B - constituent was detected in the method blank and the sample. F1 - MS and/or MSD recovery is outside acceptance limits.

3. Electrical Conductivity (EC) analyzed by EPA Method 120.1. Results reported in micromhos per centimeter (µmhos/cm).4. Petroleum hydrocarbons analyzed using EPA Method 8260B. Results reported in micrograms per liter (µg/L). J - an estimate, concentration is greater than the method detection limit but less than the reporting limit.5. EPA Method 8260B open scan for tentatively identified compounds. Results reported in µg/L. * - Laboratory control sample or control sample duplicate exceeded control limits. TJ - unknown compound, estimated value. N - presumptive evidence of material.

113T-1H-Indene - 1,1,3-trimethyl-1H-Indene 1-M-Naphthalene - 1-methyl Naphthalene 2-M-Naphthalene - 2-methyl Naphthalene123-TCB - 1,2,3-Trichlorobenzene 1-M-3-P-1H-Indene - 1-methyl-3-propyl-1H-Indene 3E-5M-1P-Cyclohexane - 3-ethyl-5-methyl-1-propyl-Cyclohexane

123-TMB - 1,2,3-Trimethylbenzene 12-DPCP - 1,2-Dipropylcyclopropene 44D-2-Acyclohexanone - 4,4-Dimethyl-2-allylcyclohexanone135-TMB - 1,3,5-Trimethylbenzene 23D-56-D-1H-Indene - 2,3-dihydro-5,6-dimethyl-1H-Indene 5,5D-1,3C - 5,5-dimethyl-1,3-Cyclohexanedione

1-(2,5DMP)-Ethanone - 1-(2,5-dimethylphenyl)-Ethanone 246T-Benzaldehyde - 2,4,6-trimethyl-Benzaldehyde N-MT-Formamide - N-methylthio Formamide1-(3,4DMP)-Ethanone - 1-(3,4-dimethylphenyl)-Ethanone 2I-13D-Cyclopentane - 2-isopropyl-1,3-dimethyl-Cyclopentane PICyclohexane - Pentylidenecyclohexane

QA/QC SamplesField Blank


Table 5Anion-Cation Balance1

21MW-1 10/06/04 -4.5621MW-2 10/06/04 -1.8421MW-3 10/08/04 -5.4429MW-1 10/08/04 -5.5021MW-1 02/08/06 1.0221MW-1 D 02/08/06 0.9221MW-2 02/07/06 -5.7021MW-3 02/09/06 -6.6229MW-1 02/09/06 -1.5121MW-1 05/19/06 -0.3221MW-1 D 05/19/06 2.6021MW-2 05/19/06 1.1021MW-3 05/19/06 2.1629MW-1 05/19/06 -3.20Influent 05/19/06 0.91Final Impoundment 05/19/06 -4.2821MW-1 08/03/06 -5.4921MW-1 D 08/03/06 -3.4121MW-2 08/03/06 -6.0221MW-3 08/03/06 -5.3029MW-1 08/03/06 -4.1921MW-1 11/02/06 -2.6721MW-1 D 11/02/06 -3.3421MW-2 11/02/06 -3.2221MW-3 11/02/06 -5.2129MW-1 11/02/06 -5.47Influent 11/02/06 -4.31Final Impoundment 11/02/06 -5.3621MW-1 02/15/07 -2.7021MW-1 D 02/15/07 -2.3821MW-2 02/15/07 -3.7321MW-3 02/15/07 -4.5029MW-1 02/15/07 -3.3921MW-1 05/17/07 -2.3821MW-1 D 05/17/07 -0.05


Sample Location DateAnion-Cation Balance

(%)




(%)21MW-2 05/17/07 1.0921MW-3 05/17/07 -0.2229MW-1 05/17/07 -1.12Influent 05/17/07 -0.33Final Impoundment 05/17/07 1.7721MW-1 08/02/07 -2.4621MW-1 D 08/02/07 -1.4921MW-2 08/02/07 -4.9221MW-3 08/02/07 -0.4529MW-1 08/02/07 -2.2021MW-1 11/01/07 2.2421MW-1 D 11/01/07 2.7321MW-2 11/01/07 3.2921MW-3 11/01/07 5.0629MW-1 11/01/07 0.7829MW-2 11/01/07 2.85Influent 11/05/07 5.66Final Impoundment 11/05/07 -5.7121MW-1 02/07/08 -0.6421MW-1 D 02/07/08 3.5521MW-2 02/07/08 0.6621MW-3 02/07/08 -0.5029MW-1 02/07/08 2.5529MW-2 02/07/08 4.8221MW-1 05/15/08 1.1521MW-1 D 05/15/08 0.4721MW-2 05/15/08 -1.7421MW-3 05/15/08 1.8129MW-1 05/15/08 3.1929MW-2 05/15/08 -1.73Influent 05/15/08 -0.47Final Impoundment 05/15/08 -11.3021MW-1 08/19/08 0.6221MW-1 D 08/19/08 -7.9221MW-2 08/19/08 -3.4921MW-3 08/19/08 -5.4729MW-1 08/19/08 0.1929MW-2 08/19/08 -0.67




(%)21MW-1 11/20/08 -6.7521MW-1 D 11/20/08 -2.4221MW-2 11/20/08 ns21MW-3 11/20/08 -0.0529MW-1 11/20/08 -4.4429MW-2 11/20/08 -6.9421MW-1 02/05/09 7.6221MW-1 D 02/05/09 4.8021MW-2 02/05/09 5.4821MW-3 02/05/09 2.5229MW-1 02/05/09 7.1529MW-2 02/05/09 3.0521MW-1 05/15/09 7.5221MW-1 D 05/15/09 10.8221MW-2 05/15/09 4.2621MW-3 05/15/09 -0.0129MW-1 05/15/09 12.3829MW-2 05/15/09 9.9721MW-1 08/06/09 2.0621MW-1 D 08/06/09 -2.2221MW-2 08/06/09 3.9721MW-3 08/06/09 1.7829MW-1 08/06/09 3.1129MW-2 08/06/09 1.4121MW-1 05/06/10 1.7321MW-1 D 05/06/10 0.7621MW-2 05/06/10 1.4621MW-3 05/06/10 -1.8629MW-1 05/06/10 0.2229MW-2 05/06/10 16.3021MW-1 05/25/11 -0.3721MW-1 D 05/25/11 5.4321MW-2 05/25/11 4.4321MW-3 05/25/11 0.5329MW-1 05/25/11 5.7129MW-2 05/25/11 3.1021MW-1 05/07/12 1.8121MW-1 D 05/07/12 4.3821MW-2 05/07/12 1.48




(%)21MW-3 05/07/12 -0.4429MW-1 05/07/12 1.8229MW-2 05/07/12 0.6721MW-1 11/27/12 -4.4121MW-1 D 11/27/12 3.0621MW-2 11/27/12 -3.8221MW-3 11/27/12 -1.5729MW-1 11/27/12 -3.5729MW-2 11/27/12 -2.5921MW-1 05/02/13 2.1421MW-1 D 05/02/13 0.0721MW-2 05/02/13 1.9721MW-3 05/02/13 -1.3029MW-1 05/02/13 -4.2129MW-2 05/02/13 -5.1621MW-1 04/30/14 0.4621MW-1 D 04/30/14 -0.2821MW-2 04/30/14 -6.3021MW-3 04/30/14 -9.2829MW-1 04/30/14 7.9429MW-2 04/30/14 -2.5421MW-1 04/21/15 2.5121MW-1 D 04/21/15 10.8221MW-2 04/21/15 -1.8321MW-3 04/21/15 -0.9421MW-4 04/30/15 1.0721MW-5 04/30/15 0.3029MW-1 04/21/15 Dry29MW-2 04/21/15 6.9821MW-1 04/14/16 3.7221MW-1 D 04/14/16 4.5421MW-2 04/14/16 7.3021MW-3 04/14/16 11.5121MW-4 04/14/16 7.4421MW-5 04/14/16 -0.1829MW-1 04/14/16 Dry29MW-2 04/14/16 0.8821MW-1 04/28/17 0.8521MW-1 D 04/28/17 -0.22




(%)21MW-2 04/28/17 -7.1921MW-3 04/28/17 -5.6121MW-4 04/25/17 -2.9621MW-5 04/25/17 -2.2729MW-1 04/28/17 Dry29MW-2 04/28/17 -1.9721MW-1 04/23/18 -6.6321MW-1 D 04/23/18 -10.8421MW-2 04/23/18 -7.2421MW-3 04/23/18 -8.3621MW-4 04/23/18 -6.4321MW-5 04/23/18 -9.4529MW-1 04/23/18 Dry29MW-2 04/23/18 -4.1521MW-1 04/22/19 -4.3921MW-1 D 04/22/19 -5.0821MW-2 04/22/19 -6.1621MW-3 04/22/19 -8.0221MW-4 04/22/19 -7.0521MW-5 04/22/19 -5.6829MW-1 04/22/19 Dry29MW-2 04/22/19 -7.11

1. Sample locations are shown on Figure 2.Anion-Cation balances shown in percent (%). D - duplicate sample.



Oxygen and Hydrogen IsotopesFormer Section 29 Surface Impoundments


Sample1 Date Collected δ18O δD21MW-1 10/06/04 -8.6 -67.0

05/17/07 -8.2 -65.408/02/07 -7.2 -60.711/01/07 -7.9 -62.602/07/08 -7.9 -64.105/15/08 -7.8 -63.208/19/08 -7.9 -64.111/20/08 -7.0 -65.002/05/09 -6.9 -64.405/06/10 na na05/25/11 -6.6 -61.505/07/12 -6.6 -57.511/27/12 -6.5 -58.405/02/13 -6.5 -59.204/30/14 -6.1 -56.104/21/15 -6.1 -57.104/14/16 -6.3 -54.404/28/17 -6.1 -55.104/23/18 -5.7 -53.504/22/19 -5.7 -53.2

(D) 04/22/19 -5.7 -53.021MW-2 10/06/04 -8.3 -65.0

05/17/07 -8.8 -69.008/02/07 -8.0 -67.111/01/07 -9.0 -68.402/07/08 -9.0 -70.105/15/08 -9.1 -69.808/19/08 -9.8 -69.211/20/08 ns ns02/05/09 -8.3 -65.805/06/10 na na05/25/11 -8.3 -68.405/07/12 -8.5 -66.611/27/12 -8.3 -67.805/02/13 -8.4 -68.104/30/14 -8.3 -65.704/21/15 -8.2 -67.5

Results2



Oxygen and Hydrogen Isotopes

Sample1 Date Collected δ18O δDResults2

21MW-2 04/14/16 -8.6 -65.3(cont.) 04/28/17 -8.4 -66.1

04/23/18 -8.1 -65.104/22/19 -8.1 -64.9

21MW-3 10/08/04 -8.0 -72.005/17/07 -9.6 -69.208/02/07 -8.2 -66.411/01/07 -8.8 -68.402/07/08 -9.0 -69.405/15/08 -9.1 -68.608/19/08 -8.9 -69.911/20/08 -8.4 -63.302/05/09 -8.4 -66.505/06/10 na na05/25/11 -8.4 -69.905/07/12 -8.5 -67.211/27/12 -8.2 -67.205/02/13 -8.6 -70.204/30/14 -8.2 -66.904/21/15 -8.4 -68.404/14/16 -8.4 -65.704/28/17 -8.5 -65.904/23/18 -7.9 -64.504/22/19 -8.0 -65.6

21MW-4 11/25/14 -8.7 -66.804/30/15 -8.1 -67.604/14/16 -8.3 -65.604/25/17 -8.1 -65.504/23/18 -8.6 -65.004/22/19 -8.0 -65.5

21MW-5 11/21/14 -8.7 -68.404/30/15 -8.7 -69.404/14/16 -9.0 -68.204/25/17 -9.0 -68.404/23/18 -9.1 -68.104/22/19 -8.8 -66.7

29MW-1 10/08/04 -6.4 -63.005/17/07 -8.0 -65.508/02/07 -7.3 -62.811/01/07 -7.3 -64.4



Oxygen and Hydrogen Isotopes

Sample1 Date Collected δ18O δDResults2

29MW-1 02/07/08 -7.0 -64.4(cont.) 05/15/08 -7.4 -64.5

08/19/08 -7.3 -63.711/20/08 -7.0 -62.202/05/09 -6.9 -63.505/06/10 na na05/25/11 -6.8 -63.505/07/12 -7.0 -62.711/27/12 -7.3 -65.005/02/13 -7.6 -67.404/30/14 -8.0 -64.904/21/15 ns ns04/14/16 ns ns04/28/17 ns ns04/23/18 ns ns04/22/19 ns ns

29MW-2 11/01/07 -3.0 -43.202/07/08 -2.9 -40.805/15/08 -2.6 -40.808/19/08 -2.5 -40.111/20/08 -2.2 -39.202/05/09 -2.6 -39.605/06/10 na na05/25/11 -2.1 -40.505/07/12 -2.9 -42.611/27/12 -2.4 -40.905/02/13 -3.2 -44.604/30/14 -2.2 -38.004/21/15 -2.1 -39.904/14/16 -2.6 -38.404/28/17 -2.5 -38.804/23/18 -2.4 -38.204/22/19 -2.1 -36.9

1. Sample locations are shown on Figure 2. (D) - duplicate sample.2. Analysis of oxygen (δ18O) and hydrogen (δD) isotopes using method CF-IRMS. Calculated using Vienna SMOW (Standard Mean Ocean Water) as the zero point. Isotopic data reported as delta units (δ) per parts per thousand (0/00), where: δ(0/00) = [ [ (18O/16O)sample - (18O/16O)standard] /(18O/16O)standard] x 1000 ns - well was not sampled. na - not analyzed for this constituent.


Table 7Soil Moisture Data


Soil Moisture Content at Depth, in percentDate 1 to 1.5 feet 2.5 to 3 feet

2008 HYDRUS Model 14 (at 0.5 meter) 5.0 (at 1 meter)2009 Closure Construction 12.1 (average near current soil sampling location)

10/01/10 11.3 nm08/25/11 9.9 13.508/20/12 9.7 10.008/22/13 10.7 11.804/30/14 5.8 6.904/21/15 8.3 10.404/14/16 10.6 12.304/25/17 10.4 13.604/24/18 9.1 11.804/23/19 10.3 12.3


Table 8Summary of Post-Closure Maintenance and Monitoring Costs


Description Cost Total DescriptionConsultant costs, per year $17,118.25

times 30 years $513,547.50 Monitoring, cover inspection, reportingChevron costs, per year $3,735.92

times 30 years $112,077.60 Cover repairs, project managementIntermittent costs, per 15 years $46,535.00 Cover repair/reseeding subcontractor,

twice in 30 years $93,070.00 pump replacement, well rehabilitationSubtotal, All Costs $718,695.10

Plus Contingency (15%) $107,804.27TOTAL $826,499.37 Costs in 2019 dollars


SITE

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Site Location MapFormer Section 29 Surface Impoundments


1Project No.: 007580

Figure

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Lost HillsOil Fields

Former Section 29Surface Impoundments

218

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Notes:1. Soil sample location is at southern end of former pond area. Location is 150 feet northeastward, perpendicular from end of southwestern fence and is marked with a rebar stake and traffic cone.2. Latitude and longitude were marked in October 2012 using a hand-held GPS. Sample location is Latitude 35.63954, Longitude -119.72985.

(5.68)

Monitoring well and groundwater elevation in feet referencing North American Vertical Datum 1988 (NAVD88) measured on April 22, 2019

Approximate soil sample location

Well 21MW-5 is completed in adifferent aquifer; groundwater elevationdata were not used to prepare thepotentiometric surface

Line of equal elevation ofpotentiometric surface, in feet NAVD88.Contours are dashed whereapproximately located

Groundwater flow direction

222

Site Plan and Potentiometric Surface MapFormer Section 29 Surface Impoundments



Figure

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06/07/2019LKP 0075802017

Piper Diagram, Water SamplesInitial Sampling and April 2019


3Date: By: Project No.:

Figure

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MWL

Explanation:Isotope data from 2016 to 2019 are shown. Well 29MW-1 has been dry since 2015; isotope data are from 2011 to 2014. Most recent data point is enlarged.Calculated using Vienna SMOW (Standard Mean Ocean Water) as the zero point. Isotopic data reported as delta units (δ) per parts per thousand (0/00), where:

δ(0/00) = [ [ (18O/16O)sample - (18O/16O)standard] /(18O/16O)standard] x 1000 MWL - Meteoric water line; a linear relationship described for continental precipitation whereby:

δ2H = (8 x δ18O) + 10

06/07/2019LKP 0075802017

Oxygen and Hydrogen Isotope RatiosFormer Section 29 Surface Impoundments


4Date: By: Project No.:

Figure

Appendix A Hydrographs

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Comparative HydrographGroundwater Monitoring Wells


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06/07/2019LKP 0075802017

HydrographMonitoring Well 21MW-1



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21MW-2 wellhead was damaged in November 2008; depth to water could not be measured. 06/07/2019LKP 0075802017




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Figure

Appendix B Laboratory Analytical Reports and Chain-of-Custody Records

ANALYTICAL REPORTEurofins TestAmerica, Irvine17461 Derian AveSuite 100Irvine, CA 92614-5817Tel: (949)261-1022

Laboratory Job ID: 440-239555-1Client Project/Site: Chevron Lost Hills Sect 29

For:Wood E&I Solutions Inc1281 E Alluvial Ave, Ste 101Fresno, California 93720

Attn: Ms. Leslie Purvis

Authorized for release by:5/23/2019 12:25:29 PM

Saman Taeidi, Project Manager I(949)[email protected]

The test results in this report meet all 2003 NELAC and 2009 TNI requirements for accreditedparameters, exceptions are noted in this report. This report may not be reproduced except in full,and with written approval from the laboratory. For questions please contact the Project Managerat the e-mail address or telephone number listed on this page.

This report has been electronically signed and authorized by the signatory. Electronic signature isintended to be the legally binding equivalent of a traditionally handwritten signature.

Results relate only to the items tested and the sample(s) as received by the laboratory.

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https://secure.testamericainc.com/TotalAccess/login.aspx

http://www.testamericainc.com/services-we-offer/ask-the-expert

http://www.testamericainc.com

mailto:[email protected]

Table of Contents

Client: Wood E&I Solutions IncProject/Site: Chevron Lost Hills Sect 29

Laboratory Job ID: 440-239555-1

Page 2 of 47Eurofins TestAmerica, Irvine

5/23/2019

Cover Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Sample Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Case Narrative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Client Sample Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Method Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Lab Chronicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

QC Sample Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

QC Association Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Definitions/Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Certification Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Subcontract Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Chain of Custody . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Receipt Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

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Sample SummaryJob ID: 440-239555-1Client: Wood E&I Solutions Inc

Project/Site: Chevron Lost Hills Sect 29

Lab Sample ID Client Sample ID ReceivedCollectedMatrix Asset ID

440-239555-1 21MW-3 Water 04/22/19 10:18 04/22/19 19:30

440-239555-2 21MW-1 Water 04/22/19 11:13 04/22/19 19:30

440-239555-3 21MW-1-DUP Water 04/22/19 11:20 04/22/19 19:30

440-239555-4 21MW-2 Water 04/22/19 12:02 04/22/19 19:30

440-239555-5 29MW-2 Water 04/22/19 12:51 04/22/19 19:30

440-239555-6 21MW-5 Water 04/22/19 14:02 04/22/19 19:30

440-239555-7 21MW-4 Water 04/22/19 14:55 04/22/19 19:30

440-239555-8 EB Water 04/22/19 15:15 04/22/19 19:30

440-239555-9 FB Water 04/22/19 15:20 04/22/19 19:30

440-239555-10 TB Water 04/22/19 00:01 04/22/19 19:30

Eurofins TestAmerica, Irvine

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Case NarrativeClient: Wood E&I Solutions Inc Job ID: 440-239555-1Project/Site: Chevron Lost Hills Sect 29

Job ID: 440-239555-1

Laboratory: Eurofins TestAmerica, Irvine

Narrative

Job Narrative

440-239555-1

Receipt

The samples were received on 4/22/2019 7:30 PM; the samples arrived in good condition, properly preserved and, where required, on ice. The temperature of the cooler at receipt was 4.6º C.

GC/MS VOA Method(s) 8260B: Internal standard (ISTD) response for TBA-d9 for the following sample was below outside acceptance criteria: (MB

440-543336/4). This ISTD does not correspond to any of the requested target compounds; therefore, the data have been reported.

Method(s) 8260B: The continuing calibration verification (CCV) associated with batch 440-543336 recovered above the upper control limit for Toluene and Ethylbenzene. The samples associated with this CCV were non-detects for the affected analytes; therefore, the data have

been reported. The following samples are impacted: 21MW-3 (440-239555-1), 21MW-1 (440-239555-2), 21MW-1-DUP (440-239555-3), 21MW-2 (440-239555-4), 29MW-2 (440-239555-5), 21MW-5 (440-239555-6) and (CCVIS 440-543336/2).

No additional analytical or quality issues were noted, other than those described above or in the Definitions/Glossary page.

HPLC/IC Method(s) 300.0: The following samples were diluted for Nitrate as NO3 due to the nature of the sample matrix: 21MW-3 (440-239555-1),

21MW-1 (440-239555-2), 21MW-1-DUP (440-239555-3), 21MW-2 (440-239555-4), 29MW-2 (440-239555-5), 21MW-5 (440-239555-6) and 21MW-4 (440-239555-7). Elevated reporting limits (RLs) are provided.


Metals Method(s) 6010B: The continuing calibration blank (CCB) for analytical batch 440-542612 contained Sodium above the reporting limit (RL). All reported samples associated with this CCB were either ND for this analyte or contained this analyte at a concentration greater than 10X the value found in the CCB; therefore, re-analysis of samples was not performed.

Method(s) 6010B: The method blank for preparation batch 440-542376 and analytical batch 440-542818 contained Sodium above the method detection limit (MDL) and Calcium above the reporting limit (RL). Associated sample(s) were not re-extracted and/or re-analyzed because results were greater than 10X the value found in the method blank.

Method(s) 6010B: The continuing calibration blank (CCB) for analytical batch 440-542818 contained Sodium above the reporting limit (RL).

All reported samples associated with this CCB were either ND for this analyte or contained this analyte at a concentration greater than 10X the value found in the CCB; therefore, re-analysis of samples was not performed.


General Chemistry Method(s) 120.1: Conductivity result was reported at a dilution and may have increased error compared to an undiluted sample.

21MW-1 (440-239555-2), 21MW-1-DUP (440-239555-3) and 29MW-2 (440-239555-5)


Subcontract non-Sister

No analytical or quality issues were noted, other than those described in the Definitions/Glossary page.

VOA Prep No analytical or quality issues were noted, other than those described in the Definitions/Glossary page.

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Client Sample ResultsJob ID: 440-239555-1Client: Wood E&I Solutions Inc


Lab Sample ID: 440-239555-1Client Sample ID: 21MW-3Matrix: WaterDate Collected: 04/22/19 10:18

Date Received: 04/22/19 19:30

Method: 8260B - Volatile Organic Compounds (GC/MS)RL MDL

Benzene ND 2.0 0.25 ug/L 04/30/19 15:18 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

2.0 0.25 ug/L 04/30/19 15:18 1Ethylbenzene ND

2.0 0.25 ug/L 04/30/19 15:18 1Toluene ND

2.0 0.50 ug/L 04/30/19 15:18 1m,p-Xylene ND

2.0 0.25 ug/L 04/30/19 15:18 1o-Xylene ND

2.0 0.25 ug/L 04/30/19 15:18 1Xylenes, Total ND

Unknown 3.1 T J ug/L 12.08 04/30/19 15:18 1

Tentatively Identified Compound Dil FacAnalyzedPreparedUnit DQualifierEst. Result CAS No.RT

104/30/19 15:18T JUnknown 6.7 ug/L 13.82

4-Bromofluorobenzene (Surr) 94 80 - 120 04/30/19 15:18 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

Dibromofluoromethane (Surr) 124 04/30/19 15:18 176 - 132

Toluene-d8 (Surr) 102 04/30/19 15:18 180 - 128

Method: 300.0 - Anions, Ion ChromatographyRL MDL

Chloride 870 100 50 mg/L 04/23/19 02:49 200


5.0 2.5 mg/L 04/23/19 02:33 10Nitrate as NO3 ND

100 50 mg/L 04/23/19 02:49 200Sulfate 1500

Method: 6010B - Metals (ICP) - DissolvedRL MDL

Boron 4.3 0.10 0.050 mg/L 04/24/19 17:09 04/25/19 15:00 2


0.20 0.10 mg/L 04/24/19 17:09 04/25/19 15:00 2Calcium 300 B

0.040 0.020 mg/L 04/24/19 17:09 04/25/19 15:00 2Magnesium 92

1.0 0.50 mg/L 04/24/19 17:09 04/25/19 15:00 2Potassium 7.8

1.0 0.52 mg/L 04/24/19 17:09 04/25/19 15:00 2Sodium 620 B ^

General ChemistryRL MDL

Specific Conductance 5300 1.0 1.0 umhos/cm 04/25/19 11:09 1


4.0 4.0 mg/L 04/25/19 07:35 1Alkalinity as CaCO3 130

4.0 4.0 mg/L 04/25/19 07:35 1Bicarbonate Alkalinity as CaCO3 130

4.0 4.0 mg/L 04/25/19 07:35 1Carbonate Alkalinity as CaCO3 ND

4.0 4.0 mg/L 04/25/19 07:35 1Hydroxide Alkalinity as CaCO3 ND

100 50 mg/L 04/24/19 08:39 1Total Dissolved Solids 3800




Benzene ND 2.0 0.25 ug/L 04/30/19 16:43 1



2.0 0.25 ug/L 04/30/19 16:43 1Toluene ND

2.0 0.50 ug/L 04/30/19 16:43 1m,p-Xylene ND

2.0 0.25 ug/L 04/30/19 16:43 1o-Xylene ND



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Unknown 12 T J ug/L 5.22 04/30/19 16:43 1


104/30/19 16:43T JUnknown 2.6 ug/L 12.08

104/30/19 16:43T JUnknown 6.8 ug/L 13.82




Toluene-d8 (Surr) 102 04/30/19 16:43 180 - 128


Chloride 5400 500 250 mg/L 04/23/19 03:53 1000


25 13 mg/L 04/23/19 03:37 50Nitrate as NO3 ND

500 250 mg/L 04/23/19 03:53 1000Sulfate 2200


Boron 24 0.50 0.25 mg/L 04/24/19 17:09 04/25/19 15:23 10


1.0 0.50 mg/L 04/24/19 17:09 04/25/19 15:23 10Calcium 1200 B

0.20 0.10 mg/L 04/24/19 17:09 04/25/19 15:23 10Magnesium 420

5.0 2.5 mg/L 04/24/19 17:09 04/25/19 15:23 10Potassium 17

5.0 2.6 mg/L 04/24/19 17:09 04/25/19 15:23 10Sodium 2100 ^ B









Lab Sample ID: 440-239555-3Client Sample ID: 21MW-1-DUPMatrix: WaterDate Collected: 04/22/19 11:20



Benzene ND 2.0 0.25 ug/L 04/30/19 17:12 1



2.0 0.25 ug/L 04/30/19 17:12 1Toluene ND

2.0 0.50 ug/L 04/30/19 17:12 1m,p-Xylene ND

2.0 0.25 ug/L 04/30/19 17:12 1o-Xylene ND


Unknown 9.7 T J ug/L 5.22 04/30/19 17:12 1





Toluene-d8 (Surr) 106 04/30/19 17:12 180 - 128


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Lab Sample ID: 440-239555-3Client Sample ID: 21MW-1-DUPMatrix: WaterDate Collected: 04/22/19 11:20



Chloride 5500 500 250 mg/L 04/23/19 04:25 1000



500 250 mg/L 04/23/19 04:25 1000Sulfate 2200


Boron 24 0.50 0.25 mg/L 04/24/19 17:09 04/25/19 15:25 10


1.0 0.50 mg/L 04/24/19 17:09 04/25/19 15:25 10Calcium 1200 B

0.20 0.10 mg/L 04/24/19 17:09 04/25/19 15:25 10Magnesium 420

5.0 2.5 mg/L 04/24/19 17:09 04/25/19 15:25 10Potassium 18

5.0 2.6 mg/L 04/24/19 17:09 04/25/19 15:25 10Sodium 2100 ^ B












Benzene ND 2.0 0.25 ug/L 04/30/19 17:40 1



2.0 0.25 ug/L 04/30/19 17:40 1Toluene ND

2.0 0.50 ug/L 04/30/19 17:40 1m,p-Xylene ND

2.0 0.25 ug/L 04/30/19 17:40 1o-Xylene ND


Unknown 12 T J ug/L 5.22 04/30/19 17:40 1


104/30/19 17:40T JUnknown 3.9 ug/L 12.08

104/30/19 17:40T JUnknown 7.1 ug/L 13.82




Toluene-d8 (Surr) 102 04/30/19 17:40 180 - 128


Chloride 910 100 50 mg/L 04/23/19 05:30 200


5.0 2.5 mg/L 04/23/19 04:41 10Nitrate as NO3 3.7 J

100 50 mg/L 04/23/19 05:30 200Sulfate 1500


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Boron 4.7 0.50 0.25 mg/L 04/24/19 17:09 04/25/19 15:27 10


1.0 0.50 mg/L 04/24/19 17:09 04/25/19 15:27 10Calcium 270 B

0.20 0.10 mg/L 04/24/19 17:09 04/25/19 15:27 10Magnesium 92

5.0 2.5 mg/L 04/24/19 17:09 04/25/19 15:27 10Potassium 11

5.0 2.6 mg/L 04/24/19 17:09 04/25/19 15:27 10Sodium 720 ^ B












Benzene 17 2.0 0.25 ug/L 04/30/19 18:08 1



2.0 0.25 ug/L 04/30/19 18:08 1Toluene ND

2.0 0.50 ug/L 04/30/19 18:08 1m,p-Xylene 0.59 J

2.0 0.25 ug/L 04/30/19 18:08 1o-Xylene 1.8 J

2.0 0.25 ug/L 04/30/19 18:08 1Xylenes, Total 2.4

Unknown 3.3 T J ug/L 3.80 04/30/19 18:08 1


104/30/19 18:08T JUnknown 11 ug/L 5.22

104/30/19 18:08T JUnknown 5.8 ug/L 10.55

104/30/19 18:08T J NBenzene, 1,2,3-trimethyl- 526-73-84.3 ug/L 11.04

104/30/19 18:08T JUnknown 6.0 ug/L 11.20

104/30/19 18:08T JUnknown 4.2 ug/L 11.68

104/30/19 18:08T JUnknown 5.8 ug/L 11.88

104/30/19 18:08T JUnknown 4.4 ug/L 11.99

104/30/19 18:08T JUnknown 8.0 ug/L 12.07

104/30/19 18:08T JUnknown 11 ug/L 13.06

104/30/19 18:08T JUnknown 5.7 ug/L 13.16

104/30/19 18:08T JUnknown 4.2 ug/L 13.53

104/30/19 18:08T JUnknown 5.4 ug/L 13.59

104/30/19 18:08T JUnknown 10 ug/L 13.78

104/30/19 18:08T JUnknown 4.8 ug/L 13.82




Toluene-d8 (Surr) 101 04/30/19 18:08 180 - 128


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Chloride 9800 1000 500 mg/L 04/23/19 06:02 2000



50 25 mg/L 04/23/19 05:46 100Sulfate 2800


Boron 45 0.50 0.25 mg/L 04/24/19 17:09 04/25/19 15:29 10


1.0 0.50 mg/L 04/24/19 17:09 04/25/19 15:29 10Calcium 1400 B

0.20 0.10 mg/L 04/24/19 17:09 04/25/19 15:29 10Magnesium 530

5.0 2.5 mg/L 04/24/19 17:09 04/25/19 15:29 10Potassium 22

5.0 2.6 mg/L 04/24/19 17:09 04/25/19 15:29 10Sodium 4300 ^ B












Benzene ND 2.0 0.25 ug/L 04/30/19 18:36 1



2.0 0.50 ug/L 04/30/19 18:36 1m,p-Xylene ND

2.0 0.25 ug/L 04/30/19 18:36 1o-Xylene ND


Unknown 9.3 T J ug/L 5.22 04/30/19 18:36 1





Toluene-d8 (Surr) 106 04/30/19 18:36 180 - 128

Method: 8260B - Volatile Organic Compounds (GC/MS) - RARL MDL

Toluene 1.5 J 2.0 0.25 ug/L 05/01/19 13:43 1


Unknown 8.1 T J ug/L 6.51 05/01/19 13:43 1


105/01/19 13:43T JUnknown 8.1 ug/L 16.52





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Method: 8260B - Volatile Organic Compounds (GC/MS) - RA (Continued)

Toluene-d8 (Surr) 100 80 - 128 05/01/19 13:43 1



Chloride 410 100 50 mg/L 04/23/19 06:34 200



100 50 mg/L 04/23/19 06:34 200Sulfate 1400


Boron 3.3 0.50 0.25 mg/L 04/24/19 17:09 04/25/19 15:31 10


1.0 0.50 mg/L 04/24/19 17:09 04/25/19 15:31 10Calcium 230 B

0.20 0.10 mg/L 04/24/19 17:09 04/25/19 15:31 10Magnesium 57

5.0 2.5 mg/L 04/24/19 17:09 04/25/19 15:31 10Potassium 8.2

5.0 2.6 mg/L 04/24/19 17:09 04/25/19 15:31 10Sodium 490 ^ B












Benzene ND 2.0 0.25 ug/L 05/01/19 04:24 1



2.0 0.25 ug/L 05/01/19 04:24 1Toluene ND

2.0 0.50 ug/L 05/01/19 04:24 1m,p-Xylene ND

2.0 0.25 ug/L 05/01/19 04:24 1o-Xylene ND


Unknown 8.3 T J ug/L 6.52 05/01/19 04:24 1


105/01/19 04:24T JUnknown 26 ug/L 15.85




Toluene-d8 (Surr) 102 05/01/19 04:24 180 - 128


Chloride 940 100 50 mg/L 04/23/19 07:06 200




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Method: 300.0 - Anions, Ion Chromatography (Continued)RL MDL

Sulfate 1600 100 50 mg/L 04/23/19 07:06 200



Boron 4.4 0.50 0.25 mg/L 04/24/19 17:09 04/25/19 15:34 10


1.0 0.50 mg/L 04/24/19 17:09 04/25/19 15:34 10Calcium 300 B

0.20 0.10 mg/L 04/24/19 17:09 04/25/19 15:34 10Magnesium 94

5.0 2.5 mg/L 04/24/19 17:09 04/25/19 15:34 10Potassium 7.3

5.0 2.6 mg/L 04/24/19 17:09 04/25/19 15:34 10Sodium 720 ^ B









Lab Sample ID: 440-239555-8Client Sample ID: EBMatrix: WaterDate Collected: 04/22/19 15:15



Benzene ND 2.0 0.25 ug/L 05/01/19 04:51 1



2.0 0.25 ug/L 05/01/19 04:51 1Toluene ND

2.0 0.50 ug/L 05/01/19 04:51 1m,p-Xylene ND

2.0 0.25 ug/L 05/01/19 04:51 1o-Xylene ND


Unknown 8.2 T J ug/L 6.52 05/01/19 04:51 1


105/01/19 04:51T JUnknown 30 ug/L 16.20




Toluene-d8 (Surr) 101 05/01/19 04:51 180 - 128

Lab Sample ID: 440-239555-9Client Sample ID: FBMatrix: WaterDate Collected: 04/22/19 15:20



Benzene ND 2.0 0.25 ug/L 05/01/19 05:18 1



2.0 0.25 ug/L 05/01/19 05:18 1Toluene ND

2.0 0.50 ug/L 05/01/19 05:18 1m,p-Xylene ND


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Lab Sample ID: 440-239555-9Client Sample ID: FBMatrix: WaterDate Collected: 04/22/19 15:20


Method: 8260B - Volatile Organic Compounds (GC/MS) (Continued)RL MDL

o-Xylene ND 2.0 0.25 ug/L 05/01/19 05:18 1



Unknown 8.2 T J ug/L 6.52 05/01/19 05:18 1


105/01/19 05:18T JUnknown 23 ug/L 15.92




Toluene-d8 (Surr) 102 05/01/19 05:18 180 - 128

Lab Sample ID: 440-239555-10Client Sample ID: TBMatrix: WaterDate Collected: 04/22/19 00:01



Benzene ND 2.0 0.25 ug/L 05/01/19 05:44 1



2.0 0.25 ug/L 05/01/19 05:44 1Toluene ND

2.0 0.50 ug/L 05/01/19 05:44 1m,p-Xylene ND

2.0 0.25 ug/L 05/01/19 05:44 1o-Xylene ND


Unknown 8.1 T J ug/L 6.52 05/01/19 05:44 1


105/01/19 05:44T JUnknown 23 ug/L 16.60




Toluene-d8 (Surr) 102 05/01/19 05:44 180 - 128


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Method SummaryJob ID: 440-239555-1Client: Wood E&I Solutions Inc


Method Method Description LaboratoryProtocol

SW8468260B Volatile Organic Compounds (GC/MS) TAL IRV

MCAWW300.0 Anions, Ion Chromatography TAL IRV

SW8466010B Metals (ICP) TAL IRV

MCAWW120.1 Conductivity, Specific Conductance TAL IRV

SMSM 2320B Alkalinity TAL IRV

SMSM 2540C Solids, Total Dissolved (TDS) TAL IRV

NoneSubcontract Oxygen & Hydrogen Isotope analysis SC0015

SW8463005A Preparation, Total Recoverable or Dissolved Metals TAL IRV

SW8465030B Purge and Trap TAL IRV

Protocol References:

MCAWW = "Methods For Chemical Analysis Of Water And Wastes", EPA-600/4-79-020, March 1983 And Subsequent Revisions.

None = None

SM = "Standard Methods For The Examination Of Water And Wastewater"

SW846 = "Test Methods For Evaluating Solid Waste, Physical/Chemical Methods", Third Edition, November 1986 And Its Updates.

Laboratory References:

SC0015 = Pace-Pittsburgh (Microseeps), 220 William Pitt Way, Pittsburgh, PA 15238, TEL (412)826-5245

TAL IRV = Eurofins TestAmerica, Irvine, 17461 Derian Ave, Suite 100, Irvine, CA 92614-5817, TEL (949)261-1022


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Lab ChronicleClient: Wood E&I Solutions Inc Job ID: 440-239555-1Project/Site: Chevron Lost Hills Sect 29

Client Sample ID: 21MW-3 Lab Sample ID: 440-239555-1Matrix: WaterDate Collected: 04/22/19 10:18


Analysis 8260B RM04/30/19 15:181 TAL IRV543336

Type

Batch

Method

Batch

Prep Type LabAnalystRun

Prepared

or Analyzed

Initial

Amount Amount

Final Batch

NumberFactor

Dil

Total/NA 10 mL 10 mL

Analysis 300.0 10 541723 04/23/19 02:33 NTN TAL IRVTotal/NA

Analysis 300.0 DL 200 541723 04/23/19 02:49 NTN TAL IRVTotal/NA


Prep 3005A 542376 04/24/19 17:09 BV TAL IRVDissolved 25 mL 25 mL

Analysis 6010B 2 542818 04/25/19 15:00 VS TAL IRVDissolved

Analysis 120.1 1 542532 04/25/19 11:09 XL TAL IRVTotal/NA

Analysis SM 2320B 1 542690 04/25/19 07:35 YZ TAL IRVTotal/NA

Analysis SM 2540C 1 542211 04/24/19 08:39 XL TAL IRVTotal/NA 10 mL 100 mL




Type

Batch

Method

Batch


Prepared

or Analyzed

Initial

Amount Amount

Final Batch

NumberFactor

Dil


Analysis 300.0 50 541723 04/23/19 03:37 NTN TAL IRVTotal/NA 5 mL 1.0 mL







Client Sample ID: 21MW-1-DUP Lab Sample ID: 440-239555-3Matrix: WaterDate Collected: 04/22/19 11:20



Type

Batch

Method

Batch


Prepared

or Analyzed

Initial

Amount Amount

Final Batch

NumberFactor

Dil










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Type

Batch

Method

Batch


Prepared

or Analyzed

Initial

Amount Amount

Final Batch

NumberFactor

Dil












Type

Batch

Method

Batch


Prepared

or Analyzed

Initial

Amount Amount

Final Batch

NumberFactor

Dil












Analysis 8260B WC05/01/19 13:431RA TAL IRV543607

Type

Batch

Method

Batch


Prepared

or Analyzed

Initial

Amount Amount

Final Batch

NumberFactor

Dil


Analysis 8260B 1 543336 04/30/19 18:36 RM TAL IRVTotal/NA 10 mL 10 mL









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Analysis 8260B P1A05/01/19 04:241 TAL IRV543521

Type

Batch

Method

Batch


Prepared

or Analyzed

Initial

Amount Amount

Final Batch

NumberFactor

Dil









Client Sample ID: EB Lab Sample ID: 440-239555-8Matrix: WaterDate Collected: 04/22/19 15:15



Type

Batch

Method

Batch


Prepared

or Analyzed

Initial

Amount Amount

Final Batch

NumberFactor

Dil


Client Sample ID: FB Lab Sample ID: 440-239555-9Matrix: WaterDate Collected: 04/22/19 15:20



Type

Batch

Method

Batch


Prepared

or Analyzed

Initial

Amount Amount

Final Batch

NumberFactor

Dil


Client Sample ID: TB Lab Sample ID: 440-239555-10Matrix: WaterDate Collected: 04/22/19 00:01



Type

Batch

Method

Batch


Prepared

or Analyzed

Initial

Amount Amount

Final Batch

NumberFactor

Dil



SC0015 = Pace-Pittsburgh (Microseeps), 220 William Pitt Way, Pittsburgh, PA 15238, TEL (412)826-5245



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QC Sample ResultsJob ID: 440-239555-1Client: Wood E&I Solutions Inc


Method: 8260B - Volatile Organic Compounds (GC/MS)

Client Sample ID: Method BlankLab Sample ID: MB 440-543336/4Matrix: Water Prep Type: Total/NAAnalysis Batch: 543336

RL MDL

Benzene ND 2.0 0.25 ug/L 04/30/19 08:14 1

MB MB

Analyte Dil FacAnalyzedPreparedDUnitResult Qualifier

ND 0.252.0 ug/L 04/30/19 08:14 1Ethylbenzene

ND 0.252.0 ug/L 04/30/19 08:14 1Toluene

ND 0.502.0 ug/L 04/30/19 08:14 1m,p-Xylene

ND 0.252.0 ug/L 04/30/19 08:14 1o-Xylene

ND 0.252.0 ug/L 04/30/19 08:14 1Xylenes, Total

Tentatively Identified Compound None ug/L 04/30/19 08:14 1

MB MB

Tentatively Identified Compound Dil FacPrepared AnalyzedDUnitQualifierEst. Result RT CAS No.


MB MB

Surrogate Dil FacPrepared AnalyzedQualifier Limits%Recovery

100 04/30/19 08:14 1Dibromofluoromethane (Surr) 76 - 132

109 04/30/19 08:14 1Toluene-d8 (Surr) 80 - 128

Client Sample ID: Lab Control SampleLab Sample ID: LCS 440-543336/5Matrix: Water Prep Type: Total/NAAnalysis Batch: 543336

Benzene 10.0 10.2 ug/L 102 68 - 130

Analyte

LCS LCS

DUnitResult Qualifier %Rec

Spike

Added

%Rec.

Limits

Ethylbenzene 10.0 12.0 ug/L 120 70 - 130

Toluene 10.0 11.0 ug/L 110 70 - 130

m,p-Xylene 10.0 9.85 ug/L 98 70 - 130

o-Xylene 10.0 10.9 ug/L 109 70 - 130

4-Bromofluorobenzene (Surr) 80 - 120

Surrogate

97

LCS LCS

Qualifier Limits%Recovery

109Dibromofluoromethane (Surr) 76 - 132

102Toluene-d8 (Surr) 80 - 128

Client Sample ID: 21MW-3Lab Sample ID: 440-239555-1 MSMatrix: Water Prep Type: Total/NAAnalysis Batch: 543336

Benzene ND 10.0 10.2 ug/L 102 66 - 130

Analyte

MS MS


Spike

Added

Sample

Result

Sample

Qualifier

%Rec.

Limits

Ethylbenzene ND 10.0 11.7 ug/L 117 70 - 130

Toluene ND 10.0 10.9 ug/L 109 70 - 130

m,p-Xylene ND 10.0 9.90 ug/L 99 70 - 133

o-Xylene ND 10.0 10.8 ug/L 108 70 - 133


Surrogate

99

MS MS





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Method: 8260B - Volatile Organic Compounds (GC/MS) (Continued)

Client Sample ID: 21MW-3Lab Sample ID: 440-239555-1 MSDMatrix: Water Prep Type: Total/NAAnalysis Batch: 543336

Benzene ND 10.0 9.81 ug/L 98 66 - 130 4 20

Analyte

MSD MSD


Spike

Added

Sample

Result

Sample

Qualifier

%Rec.

Limits LimitRPD

RPD

Ethylbenzene ND 10.0 11.2 ug/L 112 70 - 130 5 20

Toluene ND 10.0 10.2 ug/L 102 70 - 130 6 20

m,p-Xylene ND 10.0 9.39 ug/L 94 70 - 133 5 25

o-Xylene ND 10.0 10.5 ug/L 105 70 - 133 2 20


Surrogate

98

MSD MSD





RL MDL

Benzene ND 2.0 0.25 ug/L 04/30/19 21:43 1

MB MB


ND 0.252.0 ug/L 04/30/19 21:43 1Ethylbenzene

ND 0.252.0 ug/L 04/30/19 21:43 1Toluene

ND 0.502.0 ug/L 04/30/19 21:43 1m,p-Xylene

ND 0.252.0 ug/L 04/30/19 21:43 1o-Xylene

ND 0.252.0 ug/L 04/30/19 21:43 1Xylenes, Total


MB MB



MB MB



104 04/30/19 21:43 1Toluene-d8 (Surr) 80 - 128


Benzene 10.0 10.1 ug/L 101 68 - 130

Analyte

LCS LCS


Spike

Added

%Rec.

Limits

Ethylbenzene 10.0 9.80 ug/L 98 70 - 130

Toluene 10.0 10.1 ug/L 101 70 - 130

m,p-Xylene 10.0 10.2 ug/L 102 70 - 130

o-Xylene 10.0 10.8 ug/L 108 70 - 130


Surrogate

92

LCS LCS





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Client Sample ID: Matrix SpikeLab Sample ID: 440-239147-A-6 MSMatrix: Water Prep Type: Total/NAAnalysis Batch: 543521

Benzene ND 125 124 ug/L 99 66 - 130

Analyte

MS MS


Spike

Added

Sample

Result

Sample

Qualifier

%Rec.

Limits

Ethylbenzene ND 125 121 ug/L 97 70 - 130

Toluene ND 125 122 ug/L 97 70 - 130

m,p-Xylene ND 125 128 ug/L 102 70 - 133

o-Xylene ND 125 131 ug/L 105 70 - 133


Surrogate

92

MS MS




Client Sample ID: Matrix Spike DuplicateLab Sample ID: 440-239147-A-6 MSDMatrix: Water Prep Type: Total/NAAnalysis Batch: 543521

Benzene ND 125 124 ug/L 100 66 - 130 0 20

Analyte

MSD MSD


Spike

Added

Sample

Result

Sample

Qualifier

%Rec.

Limits LimitRPD

RPD

Ethylbenzene ND 125 122 ug/L 97 70 - 130 0 20

Toluene ND 125 122 ug/L 98 70 - 130 0 20

m,p-Xylene ND 125 128 ug/L 102 70 - 133 0 25

o-Xylene ND 125 134 ug/L 107 70 - 133 2 20


Surrogate

91

MSD MSD





RL MDL

Toluene ND 2.0 0.25 ug/L 05/01/19 07:54 1

MB MB



MB MB


13.24J 05/01/19 07:54 13.00 ug/L 124-19-6n-Nonyl Aldehyde


MB MB



103 05/01/19 07:54 1Toluene-d8 (Surr) 80 - 128


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Toluene 10.0 9.62 ug/L 96 70 - 130

Analyte

LCS LCS


Spike

Added

%Rec.

Limits


Surrogate

92

LCS LCS




Client Sample ID: Matrix SpikeLab Sample ID: 440-240023-A-4 MSMatrix: Water Prep Type: Total/NAAnalysis Batch: 543607

Toluene ND 5000 4610 ug/L 92 70 - 130

Analyte

MS MS


Spike

Added

Sample

Result

Sample

Qualifier

%Rec.

Limits


Surrogate

92

MS MS




Client Sample ID: Matrix Spike DuplicateLab Sample ID: 440-240023-A-4 MSDMatrix: Water Prep Type: Total/NAAnalysis Batch: 543607

Toluene ND 5000 4420 ug/L 88 70 - 130 4 20

Analyte

MSD MSD


Spike

Added

Sample

Result

Sample

Qualifier

%Rec.

Limits LimitRPD

RPD


Surrogate

92

MSD MSD




Method: 300.0 - Anions, Ion Chromatography


RL MDL

Nitrate as NO3 ND 0.50 0.25 mg/L 04/22/19 12:09 1

MB MB



Nitrate as NO3 5.00 4.92 mg/L 98 90 - 110

Analyte

LCS LCS


Spike

Added

%Rec.

Limits


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Method: 300.0 - Anions, Ion Chromatography (Continued)


RL MDL

Chloride ND 0.50 0.25 mg/L 04/22/19 12:09 1

MB MB


ND 0.250.50 mg/L 04/22/19 12:09 1Sulfate


Chloride 5.00 4.64 mg/L 93 90 - 110

Analyte

LCS LCS


Spike

Added

%Rec.

Limits

Sulfate 5.00 4.96 mg/L 99 90 - 110


Chloride 870 1000 1890 mg/L 102 80 - 120

Analyte

MS MS


Spike

Added

Sample

Result

Sample

Qualifier

%Rec.

Limits

Sulfate 1500 1000 2540 mg/L 106 80 - 120


Chloride 870 1000 1880 mg/L 101 80 - 120 1 20

Analyte

MSD MSD


Spike

Added

Sample

Result

Sample

Qualifier

%Rec.

Limits LimitRPD

RPD

Sulfate 1500 1000 2510 mg/L 104 80 - 120 1 20

Method: 300.0 - Anions, Ion Chromatography - DL


Nitrate as NO3 - DL ND 1000 1000 mg/L 100 80 - 120

Analyte

MS MS


Spike

Added

Sample

Result

Sample

Qualifier

%Rec.

Limits


Nitrate as NO3 - DL ND 1000 996 mg/L 100 80 - 120 1 20

Analyte

MSD MSD


Spike

Added

Sample

Result

Sample

Qualifier

%Rec.

Limits LimitRPD

RPD


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Method: 6010B - Metals (ICP)

Client Sample ID: Method BlankLab Sample ID: MB 440-542376/1-AMatrix: Water Prep Type: Total RecoverableAnalysis Batch: 542818 Prep Batch: 542376

RL MDL

Boron ND 0.050 0.025 mg/L 04/24/19 17:09 04/25/19 11:20 1

MB MB


0.128 0.0500.10 mg/L 04/24/19 17:09 04/25/19 11:20 1Calcium

ND 0.0100.020 mg/L 04/24/19 17:09 04/25/19 11:20 1Magnesium

ND 0.250.50 mg/L 04/24/19 17:09 04/25/19 11:20 1Potassium

0.416 J 0.260.50 mg/L 04/24/19 17:09 04/25/19 11:20 1Sodium

Client Sample ID: Lab Control SampleLab Sample ID: LCS 440-542376/2-AMatrix: Water Prep Type: Total RecoverableAnalysis Batch: 542818 Prep Batch: 542376

Boron 1.00 0.904 mg/L 90 80 - 120

Analyte

LCS LCS


Spike

Added

%Rec.

Limits

Calcium 5.00 4.64 mg/L 93 80 - 120

Magnesium 5.00 4.39 mg/L 88 80 - 120

Potassium 10.0 8.94 mg/L 89 80 - 120

Sodium 10.0 9.34 mg/L 93 80 - 120

Client Sample ID: 21MW-3Lab Sample ID: 440-239555-1 MSMatrix: Water Prep Type: DissolvedAnalysis Batch: 542818 Prep Batch: 542376

Boron 4.3 1.00 5.16 4 mg/L 88 75 - 125

Analyte

MS MS


Spike

Added

Sample

Result

Sample

Qualifier

%Rec.

Limits

Calcium 300 B 5.00 300 4 mg/L 104 75 - 125

Magnesium 92 5.00 97.8 4 mg/L 116 75 - 125

Potassium 7.8 10.0 16.1 mg/L 84 75 - 125

Sodium 620 B ^ 10.0 625 4 mg/L 92 75 - 125

Client Sample ID: 21MW-3Lab Sample ID: 440-239555-1 MSDMatrix: Water Prep Type: DissolvedAnalysis Batch: 542818 Prep Batch: 542376

Boron 4.3 1.00 5.24 4 mg/L 96 75 - 125 2 20

Analyte

MSD MSD


Spike

Added

Sample

Result

Sample

Qualifier

%Rec.

Limits LimitRPD

RPD

Calcium 300 B 5.00 305 4 mg/L 204 75 - 125 2 20

Magnesium 92 5.00 98.9 4 mg/L 138 75 - 125 1 20

Potassium 7.8 10.0 16.5 mg/L 88 75 - 125 3 20

Sodium 620 B ^ 10.0 636 4 mg/L 204 75 - 125 2 20

Method: 120.1 - Conductivity, Specific Conductance


RL MDL

Specific Conductance ND 1.0 1.0 umhos/cm 04/25/19 11:09 1

MB MB



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Method: 120.1 - Conductivity, Specific Conductance (Continued)


Specific Conductance 953 970 umhos/cm 102 90 - 110

Analyte

LCS LCS


Spike

Added

%Rec.

Limits

Client Sample ID: 21MW-3Lab Sample ID: 440-239555-1 DUMatrix: Water Prep Type: Total/NAAnalysis Batch: 542532

Specific Conductance 5300 5240 umhos/cm 0.8 5

Analyte

DU DU

DUnitResult Qualifier

Sample

Result

Sample

Qualifier LimitRPD

RPD


Specific Conductance 5500 5420 umhos/cm 0.6 5

Analyte

DU DU


Sample

Result

Sample

Qualifier LimitRPD

RPD

Method: SM 2320B - Alkalinity


RL MDL

Alkalinity as CaCO3 ND 4.0 4.0 mg/L 04/25/19 06:26 1

MB MB


ND 4.04.0 mg/L 04/25/19 06:26 1Bicarbonate Alkalinity as CaCO3

ND 4.04.0 mg/L 04/25/19 06:26 1Carbonate Alkalinity as CaCO3

ND 4.04.0 mg/L 04/25/19 06:26 1Hydroxide Alkalinity as CaCO3


Alkalinity as CaCO3 98.8 100 mg/L 102 80 - 120

Analyte

LCS LCS


Spike

Added

%Rec.

Limits


Alkalinity as CaCO3 130 128 mg/L 0.4 20

Analyte

DU DU


Sample

Result

Sample

Qualifier LimitRPD

RPD

Bicarbonate Alkalinity as CaCO3 130 128 mg/L 0.4 20

Carbonate Alkalinity as CaCO3 ND ND mg/L NC 20

Hydroxide Alkalinity as CaCO3 ND ND mg/L NC 20


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Method: SM 2540C - Solids, Total Dissolved (TDS)


RL MDL

Total Dissolved Solids ND 10 5.0 mg/L 04/24/19 08:39 1

MB MB



Total Dissolved Solids 1000 1060 mg/L 106 90 - 110

Analyte

LCS LCS


Spike

Added

%Rec.

Limits


Total Dissolved Solids 3800 3870 mg/L 2 5

Analyte

DU DU


Sample

Result

Sample

Qualifier LimitRPD

RPD


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QC Association SummaryJob ID: 440-239555-1Client: Wood E&I Solutions Inc


GC/MS VOA

Analysis Batch: 543336

Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch

Water 8260B440-239555-1 21MW-3 Total/NA


Water 8260B440-239555-3 21MW-1-DUP Total/NA




Water 8260BMB 440-543336/4 Method Blank Total/NA

Water 8260BLCS 440-543336/5 Lab Control Sample Total/NA

Water 8260B440-239555-1 MS 21MW-3 Total/NA

Water 8260B440-239555-1 MSD 21MW-3 Total/NA




Water 8260B440-239555-8 EB Total/NA

Water 8260B440-239555-9 FB Total/NA

Water 8260B440-239555-10 TB Total/NA



Water 8260B440-239147-A-6 MS Matrix Spike Total/NA

Water 8260B440-239147-A-6 MSD Matrix Spike Duplicate Total/NA



Water 8260B440-239555-6 - RA 21MW-5 Total/NA



Water 8260B440-240023-A-4 MS Matrix Spike Total/NA

Water 8260B440-240023-A-4 MSD Matrix Spike Duplicate Total/NA

HPLC/IC



Water 300.0440-239555-1 21MW-3 Total/NA

Water 300.0440-239555-1 - DL 21MW-3 Total/NA

Water 300.0440-239555-2 21MW-1 Total/NA

Water 300.0440-239555-3 21MW-1-DUP Total/NA

Water 300.0440-239555-4 21MW-2 Total/NA

Water 300.0440-239555-5 29MW-2 Total/NA

Water 300.0440-239555-6 21MW-5 Total/NA

Water 300.0440-239555-7 21MW-4 Total/NA

Water 300.0MB 440-541723/6 Method Blank Total/NA

Water 300.0LCS 440-541723/5 Lab Control Sample Total/NA

Water 300.0440-239555-1 MS - DL 21MW-3 Total/NA

Water 300.0440-239555-1 MSD - DL 21MW-3 Total/NA



Water 300.0440-239555-1 21MW-3 Total/NA

Water 300.0440-239555-2 21MW-1 Total/NA


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HPLC/IC (Continued)

Analysis Batch: 541724 (Continued)



Water 300.0440-239555-4 21MW-2 Total/NA

Water 300.0440-239555-5 29MW-2 Total/NA

Water 300.0440-239555-5 29MW-2 Total/NA

Water 300.0440-239555-6 21MW-5 Total/NA

Water 300.0440-239555-7 21MW-4 Total/NA



Water 300.0440-239555-1 MS 21MW-3 Total/NA

Water 300.0440-239555-1 MSD 21MW-3 Total/NA

Metals

Prep Batch: 542376


Water 3005A440-239555-1 21MW-3 Dissolved


Water 3005A440-239555-3 21MW-1-DUP Dissolved





Water 3005AMB 440-542376/1-A Method Blank Total Recoverable

Water 3005ALCS 440-542376/2-A Lab Control Sample Total Recoverable

Water 3005A440-239555-1 MS 21MW-3 Dissolved

Water 3005A440-239555-1 MSD 21MW-3 Dissolved



Water 6010B 542376440-239555-1 21MW-3 Dissolved


Water 6010B 542376440-239555-3 21MW-1-DUP Dissolved





Water 6010B 542376MB 440-542376/1-A Method Blank Total Recoverable

Water 6010B 542376LCS 440-542376/2-A Lab Control Sample Total Recoverable

Water 6010B 542376440-239555-1 MS 21MW-3 Dissolved

Water 6010B 542376440-239555-1 MSD 21MW-3 Dissolved

General Chemistry



Water SM 2540C440-239555-1 21MW-3 Total/NA


Water SM 2540C440-239555-3 21MW-1-DUP Total/NA






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General Chemistry (Continued)

Analysis Batch: 542211 (Continued)


Water SM 2540CMB 440-542211/1 Method Blank Total/NA

Water SM 2540CLCS 440-542211/2 Lab Control Sample Total/NA

Water SM 2540C440-239555-1 DU 21MW-3 Total/NA



Water 120.1440-239555-1 21MW-3 Total/NA

Water 120.1440-239555-2 21MW-1 Total/NA


Water 120.1440-239555-4 21MW-2 Total/NA

Water 120.1440-239555-5 29MW-2 Total/NA

Water 120.1440-239555-6 21MW-5 Total/NA

Water 120.1440-239555-7 21MW-4 Total/NA



Water 120.1440-239555-1 DU 21MW-3 Total/NA

Water 120.1440-239555-7 DU 21MW-4 Total/NA



Water SM 2320B440-239555-1 21MW-3 Total/NA


Water SM 2320B440-239555-3 21MW-1-DUP Total/NA





Water SM 2320BMB 440-542690/3 Method Blank Total/NA

Water SM 2320BLCS 440-542690/2 Lab Control Sample Total/NA

Water SM 2320B440-239555-1 DU 21MW-3 Total/NA


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Definitions/GlossaryJob ID: 440-239555-1Client: Wood E&I Solutions Inc


Qualifiers

GC/MS VOAQualifier Description

J Result is less than the RL but greater than or equal to the MDL and the concentration is an approximate value.

Qualifier

GC/MS VOA TICsQualifier Description

J Indicates an Estimated Value for TICs

Qualifier


N Presumptive evidence of material.

T Result is a tentatively identified compound (TIC) and an estimated value.

HPLC/ICQualifier Description


Qualifier

MetalsQualifier Description

^ ICV,CCV,ICB,CCB, ISA, ISB, CRI, CRA, DLCK or MRL standard: Instrument related QC is outside acceptance limits.

Qualifier

4 MS, MSD: The analyte present in the original sample is greater than 4 times the matrix spike concentration; therefore, control limits are not

applicable.B Compound was found in the blank and sample.


GlossaryThese commonly used abbreviations may or may not be present in this report.

¤ Listed under the "D" column to designate that the result is reported on a dry weight basis

Abbreviation

%R Percent Recovery

CFL Contains Free Liquid

CNF Contains No Free Liquid

DER Duplicate Error Ratio (normalized absolute difference)

Dil Fac Dilution Factor

DL Detection Limit (DoD/DOE)

DL, RA, RE, IN Indicates a Dilution, Re-analysis, Re-extraction, or additional Initial metals/anion analysis of the sample

DLC Decision Level Concentration (Radiochemistry)

EDL Estimated Detection Limit (Dioxin)

LOD Limit of Detection (DoD/DOE)

LOQ Limit of Quantitation (DoD/DOE)

MDA Minimum Detectable Activity (Radiochemistry)

MDC Minimum Detectable Concentration (Radiochemistry)

MDL Method Detection Limit

ML Minimum Level (Dioxin)

NC Not Calculated

ND Not Detected at the reporting limit (or MDL or EDL if shown)

PQL Practical Quantitation Limit

QC Quality Control

RER Relative Error Ratio (Radiochemistry)

RL Reporting Limit or Requested Limit (Radiochemistry)

RPD Relative Percent Difference, a measure of the relative difference between two points

TEF Toxicity Equivalent Factor (Dioxin)

TEQ Toxicity Equivalent Quotient (Dioxin)


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Accreditation/Certification SummaryClient: Wood E&I Solutions Inc Job ID: 440-239555-1Project/Site: Chevron Lost Hills Sect 29

Laboratory: Eurofins TestAmerica, IrvineAll accreditations/certifications held by this laboratory are listed. Not all accreditations/certifications are applicable to this report.

Authority Program EPA Region Identification Number Expiration Date

Alaska CA0153110State Program 06-30-19

Arizona State Program 9 AZ0671 10-14-19

California LA Cty Sanitation Districts 9 10256 06-30-19

California State Program 9 CA ELAP 2706 06-30-19

Guam State Program 9 Cert. No. 19-005R 01-23-20

Hawaii State Program 9 N/A 01-29-20

Kansas NELAP 7 E-10420 07-31-19

Nevada State Program 9 CA015312018-1 07-31-19

New Mexico State Program 6 N/A 01-29-20

Oregon NELAP 10 4028 01-29-20

US Fish & Wildlife Federal 058448 07-31-19

USDA Federal P330-18-00214 07-09-21

Washington State Program 10 C900 09-03-19


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Pace Analytical Energy Services LLC

CERTIFICATE OF ANALYSISThis report shall not be reproduced, except in full,

Report ID: 30126 - 1168162 Page 1 of 12

Saman TaeidiEurofins Test America- Irvine, CA17461 Derian AveSuite 100Irvine, CA 92614

May 21, 2019

RE:Pace Workorder:

440-239555-1

Dear Saman Taeidi:

30126

Enclosed are the analytical results for sample(s) received by the laboratory on Wednesday, April 24, 2019.Results reported herein conform to the most current NELAC standards, where applicable, unless otherwisenarrated in the body of the report.

If you have any questions concerning this report, please feel free to contact me.

Sincerely,

Enclosures

Ruth Welsh 05/21/[email protected]

Total Number of Pages ____As a valued client we would appreciate your comments on our service.

Please email [email protected].

Customer Service Representative

220 William Pitt WayPittsburgh, PA 15238

Phone: (412) 826-5245Fax: (412) 826-3433

without the written consent of Pace Analytical Energy Services LLC.

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Report ID: 30126 - 1168162 Page 2 of 12

LABORATORY ACCREDITATIONS & CERTIFICATIONS

Pennsylvania Department of Environmental Protection, Bureau of Laboratories02-00538NELAP Non-Potable Water

Accreditor:Accreditation ID:Scope:

West Virginia Department of Environmental Protection, Division of Water and WasteManagement395Non-Potable Water

Accreditor:

Accreditation ID:Scope:

South Carolina Department of Health and Environmental Control, Office of EnvironmentalLaboratory Certification89009003Clean Water Act (CWA); Resource Conservation and Recovery Act (RCRA)

Accreditor:

Accreditation ID:Scope:

State of Virginia460201Non-Potable Water


NELAP: New Jersey, Department of Environmental ProtectionPA026Non-Potable Water


NELAP: New York, Department of Health Wadsworth Center11815Non-Potable Water


State of Connecticut, Department of Public Health, Division of Environmental HealthPH-0263Clean Water Act (CWA) Resource Conservation and Recovery Act (RCRA)


NELAP: Texas, Commission on Environmental QualityT104704453-09-TXNon-Potable Water


State of New Hampshire299409Non-potable water


State of GeorgiaChapter 391-3-26As per the Georgia EPD Rules and Regulations for Commercial Laboratories, PAES isaccredited by the Pennsylvania Department of Environmental Protection Bureau ofLaboratories under the National Environmental Laboratory Approval Program (NELAC).



Phone: (412) 826-5245Fax: (412) 826-3433


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Report ID: 30126 - 1168162 Page 3 of 12

SAMPLE SUMMARY

Workorder: 30126 440-239555-1

Lab ID Sample ID Matrix Date Collected Date Received

301260001 21MW-3 (440-239555-1) Water 4/22/2019 10:18 4/24/2019 11:15

301260002 21MW-1 (440-239555-2) Water 4/22/2019 11:13 4/24/2019 11:15

301260003 21MW-1-DUP (440-239555-3) Water 4/22/2019 11:20 4/24/2019 11:15

301260004 21MW-2 (440-239555-4) Water 4/22/2019 12:02 4/24/2019 11:15

301260005 29MW-2 (440-239555-5) Water 4/22/2019 12:51 4/24/2019 11:15

301260006 21MW-5 (440-239555-6) Water 4/22/2019 14:02 4/24/2019 11:15

301260007 21MW-4 (440-239555-7) Water 4/22/2019 14:55 4/24/2019 11:15


Phone: (412) 826-5245Fax: (412) 826-3433


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Report ID: 30126 - 1168162 Page 4 of 12

ANALYTICAL RESULTS

Workorder: 30126 440-239555-1

4/24/2019 11:15

21MW-3 (440-239555-1)

Matrix: Water

RegLmtParameters

Lab ID:

Sample ID:

RegLmt

301260001

Results Units PQL DF ByAnalyzedMDL Qualifiers

Date Collected:

Date Received:

4/22/2019 10:18

Compound Specific Isotopic - PAESAnalysis Desc: D18O Analytical Method: D18O

Hydrogen 2 (Deuterium)Isotope

Complete 1 5/14/2019 00:00 NAU n

Oxygen 18 Isotope Complete 1 5/14/2019 00:00 NAU n


Phone: (412) 826-5245Fax: (412) 826-3433


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Report ID: 30126 - 1168162 Page 5 of 12

ANALYTICAL RESULTS

Workorder: 30126 440-239555-1

4/24/2019 11:15

21MW-1 (440-239555-2)

Matrix: Water

RegLmtParameters

Lab ID:

Sample ID:

RegLmt

301260002


Date Collected:

Date Received:

4/22/2019 11:13



Complete 1 5/14/2019 00:00 NAU n



Phone: (412) 826-5245Fax: (412) 826-3433


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Report ID: 30126 - 1168162 Page 6 of 12

ANALYTICAL RESULTS

Workorder: 30126 440-239555-1

4/24/2019 11:15

21MW-1-DUP (440-239555-3)

Matrix: Water

RegLmtParameters

Lab ID:

Sample ID:

RegLmt

301260003


Date Collected:

Date Received:

4/22/2019 11:20



Complete 1 5/14/2019 00:00 NAU n



Phone: (412) 826-5245Fax: (412) 826-3433


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Report ID: 30126 - 1168162 Page 7 of 12

ANALYTICAL RESULTS

Workorder: 30126 440-239555-1

4/24/2019 11:15

21MW-2 (440-239555-4)

Matrix: Water

RegLmtParameters

Lab ID:

Sample ID:

RegLmt

301260004


Date Collected:

Date Received:

4/22/2019 12:02



Complete 1 5/14/2019 00:00 NAU n



Phone: (412) 826-5245Fax: (412) 826-3433


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Report ID: 30126 - 1168162 Page 8 of 12

ANALYTICAL RESULTS

Workorder: 30126 440-239555-1

4/24/2019 11:15

29MW-2 (440-239555-5)

Matrix: Water

RegLmtParameters

Lab ID:

Sample ID:

RegLmt

301260005


Date Collected:

Date Received:

4/22/2019 12:51



Complete 1 5/14/2019 00:00 NAU n



Phone: (412) 826-5245Fax: (412) 826-3433


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Report ID: 30126 - 1168162 Page 9 of 12

ANALYTICAL RESULTS

Workorder: 30126 440-239555-1

4/24/2019 11:15

21MW-5 (440-239555-6)

Matrix: Water

RegLmtParameters

Lab ID:

Sample ID:

RegLmt

301260006


Date Collected:

Date Received:

4/22/2019 14:02



Complete 1 5/14/2019 00:00 NAU n



Phone: (412) 826-5245Fax: (412) 826-3433


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Report ID: 30126 - 1168162 Page 10 of 12

ANALYTICAL RESULTS

Workorder: 30126 440-239555-1

4/24/2019 11:15

21MW-4 (440-239555-7)

Matrix: Water

RegLmtParameters

Lab ID:

Sample ID:

RegLmt

301260007


Date Collected:

Date Received:

4/22/2019 14:55



Complete 1 5/14/2019 00:00 NAU n



Phone: (412) 826-5245Fax: (412) 826-3433


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Report ID: 30126 - 1168162 Page 11 of 12

ANALYTICAL RESULTS QUALIFIERS

Workorder: 30126 440-239555-1

DEFINITIONS/QUALIFIERS

U

J

Indicates the compound was analyzed for, but not detected at or above the noted concentration.

Estimated concentration greater than the set method detection limit (MDL) and less than the set reporting limit (PQL).

MDL Method Detection Limit. Can be used synonymously with LOD; Limit Of Detection.

PQL Practical Quanitation Limit. Can be used synonymously with LOQ; Limit Of Quantitation.

ND Not detected at or above reporting limit.

DF Dilution Factor.

S Surrogate.

RPD Relative Percent Difference.

% Rec Percent Recovery.

The laboratory does not hold NELAP/TNI accreditation for this method or analyte.n


Phone: (412) 826-5245Fax: (412) 826-3433


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Report ID: 30126 - 1168162 Page 12 of 12

QUALITY CONTROL DATA CROSS REFERENCE TABLE

Workorder: 30126 440-239555-1

Lab ID Sample ID Prep Method Analysis MethodPrep Batch BatchAnalysis

301260001 21MW-3 (440-239555-1) CSIA/1946D18O

301260002 21MW-1 (440-239555-2) CSIA/1946D18O

301260003 21MW-1-DUP (440-239555-3) CSIA/1946D18O

301260004 21MW-2 (440-239555-4) CSIA/1946D18O

301260005 29MW-2 (440-239555-5) CSIA/1946D18O

301260006 21MW-5 (440-239555-6) CSIA/1946D18O

301260007 21MW-4 (440-239555-7) CSIA/1946D18O


Phone: (412) 826-5245Fax: (412) 826-3433


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Login Sample Receipt Checklist

Client: Wood E&I Solutions Inc Job Number: 440-239555-1

Login Number: 239555

Question Answer Comment

Creator: Escalante, Maria I

List Source: Eurofins TestAmerica, Irvine

List Number: 1

TrueRadioactivity wasn't checked or is </= background as measured by a survey meter.

N/AThe cooler's custody seal, if present, is intact. Not present

N/ASample custody seals, if present, are intact. Not Present

TrueThe cooler or samples do not appear to have been compromised or tampered with.

TrueSamples were received on ice.

TrueCooler Temperature is acceptable.

TrueCooler Temperature is recorded.

TrueCOC is present.

TrueCOC is filled out in ink and legible.

TrueCOC is filled out with all pertinent information.

TrueIs the Field Sampler's name present on COC?

TrueThere are no discrepancies between the containers received and the COC.

TrueSamples are received within Holding Time (excluding tests with immediate HTs)

TrueSample containers have legible labels.

TrueContainers are not broken or leaking.

TrueSample collection date/times are provided.

TrueAppropriate sample containers are used.

TrueSample bottles are completely filled.

N/ASample Preservation Verified.

TrueThere is sufficient vol. for all requested analyses, incl. any requested MS/MSDs

TrueContainers requiring zero headspace have no headspace or bubble is <6mm (1/4").

TrueMultiphasic samples are not present.

TrueSamples do not require splitting or compositing.

N/AResidual Chlorine Checked.


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ANALYTICAL REPORTEurofins TestAmerica, Irvine17461 Derian AveSuite 100Irvine, CA 92614-5817Tel: (949)261-1022

Laboratory Job ID: 440-244587-1Client Project/Site: Westside Water Quality Coalition

For:Wood E&I Solutions Inc1281 E. Alluvial Ave.Suite 101Fresno, California 93720

Attn: Jill Ghelerter

Authorized for release by:6/29/2019 6:48:32 AM

Saman Taeidi, Project Manager I(949)[email protected]

The test results in this report meet all 2003 NELAC and 2009 TNI requirements for accreditedparameters, exceptions are noted in this report. This report may not be reproduced except in full,and with written approval from the laboratory. For questions please contact the Project Managerat the e-mail address or telephone number listed on this page.

This report has been electronically signed and authorized by the signatory. Electronic signature isintended to be the legally binding equivalent of a traditionally handwritten signature.

Results relate only to the items tested and the sample(s) as received by the laboratory.

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https://secure.testamericainc.com/TotalAccess/login.aspx

http://www.testamericainc.com/services-we-offer/ask-the-expert

http://www.testamericainc.com


Table of Contents

Client: Wood E&I Solutions IncProject/Site: Westside Water Quality Coalition

Laboratory Job ID: 440-244587-1

Page 2 of 13Eurofins TestAmerica, Irvine

6/29/2019

Cover Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Sample Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Case Narrative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Client Sample Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Method Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Lab Chronicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

QC Sample Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

QC Association Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Definitions/Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Certification Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Chain of Custody . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Receipt Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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Sample SummaryJob ID: 440-244587-1Client: Wood E&I Solutions Inc

Project/Site: Westside Water Quality Coalition

Lab Sample ID Client Sample ID ReceivedCollectedMatrix Asset ID

440-244587-1 WESTC00022_20190625 Water 06/25/19 12:07 06/26/19 10:30


Page 3 of 13 6/29/2019

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Case NarrativeClient: Wood E&I Solutions Inc Job ID: 440-244587-1Project/Site: Westside Water Quality Coalition

Job ID: 440-244587-1

Laboratory: Eurofins TestAmerica, Irvine

Narrative

Job Narrative

440-244587-1

Receipt

The sample was received on 6/26/2019 10:30 AM; the sample arrived in good condition, properly preserved and, where required, on ice. The temperature of the cooler at receipt was 4.0º C.

HPLC/IC Method(s) 300.0: The following sample was diluted due to the nature of the sample matrix: WESTC00022_20190625 (440-244587-1).

Elevated reporting limits (RLs) are provided.



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Lab Sample ID: 440-244587-1Client Sample ID: WESTC00022_20190625Matrix: WaterDate Collected: 06/25/19 12:07



Nitrate as N ND 1.1 0.55 mg/L 06/26/19 15:14 10



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Method SummaryJob ID: 440-244587-1Client: Wood E&I Solutions Inc


Method Method Description LaboratoryProtocol

MCAWW300.0 Anions, Ion Chromatography TAL IRV

Protocol References:

MCAWW = "Methods For Chemical Analysis Of Water And Wastes", EPA-600/4-79-020, March 1983 And Subsequent Revisions.




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Lab ChronicleClient: Wood E&I Solutions Inc Job ID: 440-244587-1Project/Site: Westside Water Quality Coalition

Client Sample ID: WESTC00022_20190625 Lab Sample ID: 440-244587-1Matrix: WaterDate Collected: 06/25/19 12:07


Analysis 300.0 NTN06/26/19 15:1410 TAL IRV554734

Type

Batch

Method

Batch


Prepared

or Analyzed

Initial

Amount Amount

Final Batch

NumberFactor

Dil

Total/NA




Page 7 of 13 6/29/2019

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Method: 300.0 - Anions, Ion Chromatography


RL MDL

Nitrate as N ND 0.11 0.055 mg/L 06/26/19 12:36 1

MB MB



Nitrate as N 1.13 1.17 mg/L 104 90 - 110

Analyte

LCS LCS


Spike

Added

%Rec.

Limits

Client Sample ID: Matrix SpikeLab Sample ID: 440-244583-C-1 MSMatrix: Water Prep Type: Total/NAAnalysis Batch: 554734

Nitrate as N 0.093 J 1.13 1.29 mg/L 106 80 - 120

Analyte

MS MS


Spike

Added

Sample

Result

Sample

Qualifier

%Rec.

Limits

Client Sample ID: Matrix Spike DuplicateLab Sample ID: 440-244583-C-1 MSDMatrix: Water Prep Type: Total/NAAnalysis Batch: 554734

Nitrate as N 0.093 J 1.13 1.28 mg/L 105 80 - 120 1 20

Analyte

MSD MSD


Spike

Added

Sample

Result

Sample

Qualifier

%Rec.

Limits LimitRPD

RPD


Page 8 of 13 6/29/2019

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HPLC/IC



Water 300.0440-244587-1 WESTC00022_20190625 Total/NA



Water 300.0440-244583-C-1 MS Matrix Spike Total/NA

Water 300.0440-244583-C-1 MSD Matrix Spike Duplicate Total/NA


Page 9 of 13 6/29/2019

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Definitions/GlossaryJob ID: 440-244587-1Client: Wood E&I Solutions Inc


GlossaryThese commonly used abbreviations may or may not be present in this report.

¤ Listed under the "D" column to designate that the result is reported on a dry weight basis

Abbreviation

%R Percent Recovery

CFL Contains Free Liquid

CNF Contains No Free Liquid

DER Duplicate Error Ratio (normalized absolute difference)

Dil Fac Dilution Factor

DL Detection Limit (DoD/DOE)

DL, RA, RE, IN Indicates a Dilution, Re-analysis, Re-extraction, or additional Initial metals/anion analysis of the sample

DLC Decision Level Concentration (Radiochemistry)

EDL Estimated Detection Limit (Dioxin)

LOD Limit of Detection (DoD/DOE)

LOQ Limit of Quantitation (DoD/DOE)

MDA Minimum Detectable Activity (Radiochemistry)

MDC Minimum Detectable Concentration (Radiochemistry)

MDL Method Detection Limit

ML Minimum Level (Dioxin)

NC Not Calculated

ND Not Detected at the reporting limit (or MDL or EDL if shown)

PQL Practical Quantitation Limit

QC Quality Control

RER Relative Error Ratio (Radiochemistry)

RL Reporting Limit or Requested Limit (Radiochemistry)

RPD Relative Percent Difference, a measure of the relative difference between two points

TEF Toxicity Equivalent Factor (Dioxin)

TEQ Toxicity Equivalent Quotient (Dioxin)


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Accreditation/Certification SummaryClient: Wood E&I Solutions Inc Job ID: 440-244587-1Project/Site: Westside Water Quality Coalition

Laboratory: Eurofins TestAmerica, IrvineThe accreditations/certifications listed below are applicable to this report.

Authority Program EPA Region Identification Number Expiration Date

California CA ELAP 27069State Program 06-30-19 *


* Accreditation/Certification renewal pending - accreditation/certification considered valid.

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Login Sample Receipt Checklist

Client: Wood E&I Solutions Inc Job Number: 440-244587-1

Login Number: 244587

Question Answer Comment

Creator: Skinner, Alma D

List Source: Eurofins TestAmerica, Irvine

List Number: 1

TrueRadioactivity wasn't checked or is </= background as measured by a survey meter.

N/AThe cooler's custody seal, if present, is intact. Not present

N/ASample custody seals, if present, are intact. Not Present

TrueThe cooler or samples do not appear to have been compromised or tampered with.

TrueSamples were received on ice.

TrueCooler Temperature is acceptable.

TrueCooler Temperature is recorded.

TrueCOC is present.

TrueCOC is filled out in ink and legible.

TrueCOC is filled out with all pertinent information.

TrueIs the Field Sampler's name present on COC?

TrueThere are no discrepancies between the containers received and the COC.

TrueSamples are received within Holding Time (excluding tests with immediate HTs)

TrueSample containers have legible labels.

TrueContainers are not broken or leaking.

TrueSample collection date/times are provided.

TrueAppropriate sample containers are used.

TrueSample bottles are completely filled.

N/ASample Preservation Verified.

TrueThere is sufficient vol. for all requested analyses, incl. any requested MS/MSDs

TrueContainers requiring zero headspace have no headspace or bubble is <6mm (1/4").

TrueMultiphasic samples are not present.

TrueSamples do not require splitting or compositing.

N/AResidual Chlorine Checked.


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Thank you for using BSK Associates for your analytical testing needs. In the following pages, you will

find the test results for the samples submitted to our laboratory on 12/5/2018. The results have been

approved for release by our Laboratory Director as indicated by the authorizing signature below.

The samples were analyzed for the test(s) indicated on the Chain of Custody (see attached) and the

results relate only to the samples analyzed. BSK certifies that the testing was performed in

accordance with the quality system requirements specified in the 2009 TNI Standard. Any deviations

from this standard or from the method requirements for each test procedure performed will be

annotated alongside the analytical result or noted in the Case Narrative. Unless otherwise noted, the

sample results are reported on an �as received� basis.

This certificate of analysis shall not be reproduced except in full, without written approval of the laboratory.

If additional clarification of any information is required, please contact your Project Manager,

Adam Trevarrow , at (800) 877-8310 or (559) 497-2888 x116.

Thank you again for using BSK Associates. We value your business and appreciate your loyalty.

Sincerely,

Amec Foster Wheeler

Fresno, CA 93720

1281 E. Alluvial, Ste. 101

Dear Jill Ghelerter,

Jill Ghelerter

12/18/2018

A8L0619

RE: Report for A8L0619 Westside Water Quality Coalition

Adam Trevarrow, Project Manager

Accredited in Accordance with NELAP

ORELAP #4021-009

BSK Associates Laboratory Fresno

1414 Stanislaus St

Fresno, CA 93706

559-497-2888 (Main)

559-485-6935 (FAX)Invoice: A837217

www.BSKAssociates.com

The results in this report apply to the samples analyzed in

accordance with the chain of custody document. This

analytical report must be reproduced in its entirety.

A8L0619 FINAL 12182018 1246

Page 1 of 10

A8L0619

Westside Water Quality Coalition

Case Narrative

Project and Report Details

Client: Amec Foster Wheeler

Report To:

Project #:

Received: 12/05/2018 - 12:00

Jill Ghelerter

Invoice To:

Invoice Attn:

Amec Foster Wheeler

Cheryl Baldwin

Project PO#: FR1216043A.011

Report Due: 12/19/2018

Invoice Details

FR1216043A.011

Sample Receipt Conditions

Default CoolerCooler:

Temperature on Receipt ºC: 2.9

Containers Intact

COC/Labels Agree

Preservation Confirmed

Received On Wet Ice

Sample(s) arrived at lab on same day sampled.

Packing Material - Other

Sample(s) were received in temperature range.

Initial receipt at BSK-FAL

Data Qualifiers

The following qualifiers have been applied to one or more analytical results:

MS1.0 Matrix spike recoveries exceed control limits.

MS1.4 Matrix spike recovery data unreliable due to significant parent sample concentration relative to fortification level (>4x).

Recipient(s) Report Format

Report Distribution

CC:

Jill Ghelerter FINAL.RPT

Joshua Spink FINAL.RPT

Leslie Purvis FINAL.RPT





A8L0619 FINAL 12182018 1246

Page 2 of 10

Certificate of Analysis

A8L0619Westside Water Quality Coalition

FR1216043A.011

Sample Description: WESTC0002220181205

Sample ID: A8L0619-01 12/05/18 - 09:29

Sampled By:

Grab

Steve Velasquez Water

Sample Date - Time:

Matrix:

Sample Type:


General Chemistry

ResultAnalyte RL Prepared AnalyzedRL

MultUnitsMethod Batch Qual

3.0 mg/LAlkalinity as CaCO3 SM 2320B 12/10/18 12/10/18A818406130 1

3.0 mg/LBicarbonate as CaCO3 SM 2320B 12/10/18 12/10/18A818406130 1

3.0 mg/LCarbonate as CaCO3 SM 2320B 12/10/18 12/10/18A818406ND 1

3.0 mg/LHydroxide as CaCO3 SM 2320B 12/10/18 12/10/18A818406ND 1

5.0 mg/LChloride EPA 300.0 12/06/18 12/06/18A8182291000 5

5.0 mg/LSulfate as SO4 EPA 300.0 12/06/18 12/06/18A8182291600 5

5.0 mg/LTotal Dissolved Solids SM 2540C 12/11/18 12/17/18A8184843700 1

0.10 mg/LTotal Nitrogen 0.24

0.10 mg/LTotal Oxidizable Nitrogen, as N SM 4500-NO3 F 12/11/18 12/11/18A8184690.24 1

Metals

ResultAnalyte RL Prepared AnalyzedRL

MultUnitsMethod Batch Qual

0.10 mg/LBoron EPA 200.7 12/07/18 12/11/18A818316 MS1.44.1 1

0.10 mg/LCalcium EPA 200.7 12/07/18 12/11/18A818316 MS1.4330 1

0.10 mg/LMagnesium EPA 200.7 12/07/18 12/11/18A818316 MS1.4100 1

2.0 mg/LPotassium EPA 200.7 12/07/18 12/11/18A8183168.1 1

1.0 mg/LSodium EPA 200.7 12/07/18 12/11/18A818316 MS1.4800 1





A8L0619 FINAL 12182018 1246

Page 3 of 10

A8L0619



General Chemistry Quality Control Report

Analyte Result Units Level

Spike

Result %REC Limits RPD Limit QualRL

Source %REC RPD Date

Analyzed

Batch: A818229 Prepared: 12/6/2018

Analyst: BCBPrep Method: Method Specific Preparation

EPA 300.0 - Quality Control

Blank (A818229-BLK1)

Chloride ND mg/L1.0 12/06/18

Sulfate as SO4 ND mg/L1.0 12/06/18

Blank Spike (A818229-BS1)

90-11098Chloride 10098 mg/L1.0 ND 12/06/18

90-11097Sulfate as SO4 10097 mg/L1.0 ND 12/06/18

Matrix Spike (A818229-MS1), Source: A8L0627-01

80-120100Chloride 5060 mg/L1.0 10 12/06/18

80-12099Sulfate as SO4 5059 mg/L1.0 8.9 12/06/18

Matrix Spike Dup (A818229-MSD1), Source: A8L0627-01

2080-120101 0Chloride 5061 mg/L1.0 10 12/06/18

2080-120100 0Sulfate as SO4 5059 mg/L1.0 8.9 12/06/18


Analyst: CEGPrep Method: Method Specific Preparation

SM 2320B - Quality Control


Alkalinity as CaCO3 ND mg/L3.0 12/10/18

Bicarbonate as CaCO3 ND mg/L3.0 12/10/18

Carbonate as CaCO3 ND mg/L3.0 12/10/18

Hydroxide as CaCO3 ND mg/L3.0 12/10/18


80-12095Alkalinity as CaCO3 10095 mg/L3.0 ND 12/10/18

Blank Spike Dup (A818406-BSD1)

2080-12096 1Alkalinity as CaCO3 10096 mg/L3.0 ND 12/10/18

Duplicate (A818406-DUP1), Source: A8L0523-04

100Alkalinity as CaCO3 140 mg/L3.0 140 12/10/18

100Bicarbonate as CaCO3 140 mg/L3.0 140 12/10/18

10Carbonate as CaCO3 ND mg/L3.0 ND 12/10/18

10Hydroxide as CaCO3 ND mg/L3.0 ND 12/10/18


Analyst: DEP SYYPrep Method: Method Specific Preparation

SM 2540C - Quality Control


Total Dissolved Solids ND mg/L5.0 12/17/18





A8L0619 FINAL 12182018 1246

Page 4 of 10

A8L0619



General Chemistry Quality Control Report


Spike



Analyzed


Analyst: DEP SYYPrep Method: Method Specific Preparation

SM 2540C - Quality Control


70-13096Total Dissolved Solids 1000960 mg/L5.0 ND 12/17/18


204Total Dissolved Solids 53 mg/L5.0 51 12/17/18


200Total Dissolved Solids 710 mg/L5.0 710 12/17/18


Analyst: CEGPrep Method: Method Specific Preparation

SM 4500-NO3 F - Quality Control


Total Oxidizable Nitrogen, as N ND mg/L0.10 12/11/18


80-120101Total Oxidizable Nitrogen, as N 1010 mg/L0.10 ND 12/11/18


2080-120101 1Total Oxidizable Nitrogen, as N 1010 mg/L0.10 ND 12/11/18

Matrix Spike (A818469-MS1), Source: A8K3461-01

80-12098Total Oxidizable Nitrogen, as N 1011 mg/L0.10 1.4 12/11/18


80-12095Total Oxidizable Nitrogen, as N 109.9 mg/L0.10 0.45 12/11/18

Matrix Spike Dup (A818469-MSD1), Source: A8K3461-01

2080-12098 0Total Oxidizable Nitrogen, as N 1011 mg/L0.10 1.4 12/11/18


2080-12096 1Total Oxidizable Nitrogen, as N 1010 mg/L0.10 0.45 12/11/18





A8L0619 FINAL 12182018 1246

Page 5 of 10

A8L0619



Metals Quality Control Report


Spike



Analyzed


Analyst: ICPPrep Method: EPA 200.2

EPA 200.7 - Quality Control


Boron ND mg/L0.10 12/11/18

Calcium ND mg/L0.10 12/11/18

Magnesium ND mg/L0.10 12/11/18

Potassium ND mg/L2.0 12/11/18

Sodium ND mg/L1.0 12/11/18


85-11591Boron 0.200.18 mg/L0.10 ND 12/11/18

85-11598Calcium 4.03.9 mg/L0.10 ND 12/11/18

85-115102Magnesium 4.04.1 mg/L0.10 ND 12/11/18

85-11597Potassium 4.03.9 mg/L2.0 ND 12/11/18

85-115104Sodium 4.04.2 mg/L1.0 ND 12/11/18


2085-11592 1Boron 0.200.18 mg/L0.10 ND 12/11/18

2085-11597 0Calcium 4.03.9 mg/L0.10 ND 12/11/18

2085-115103 1Magnesium 4.04.1 mg/L0.10 ND 12/11/18

2085-11599 2Potassium 4.04.0 mg/L2.0 ND 12/11/18

2085-115103 1Sodium 4.04.1 mg/L1.0 ND 12/11/18


MS1.070-130171Boron 0.20 High4.5 mg/L0.10 4.1 12/11/18

MS1.070-130349Calcium 4.0 High340 mg/L0.10 330 12/11/18

MS1.070-130185Magnesium 4.0 High110 mg/L0.10 100 12/11/18

70-130110Potassium 4.013 mg/L2.0 8.1 12/11/18

MS1.070-130NRSodium 4.0 High840 mg/L1.0 800 12/11/18


20 MS1.070-130174 0Boron 0.20 High4.5 mg/L0.10 4.1 12/11/18

20 MS1.070-130159 2Calcium 4.0 High330 mg/L0.10 330 12/11/18

20 MS1.070-130190 0Magnesium 4.0 High110 mg/L0.10 100 12/11/18

2070-130110 0Potassium 4.012 mg/L2.0 8.1 12/11/18

20 MS1.070-130NR 0Sodium 4.0 High840 mg/L1.0 800 12/11/18





A8L0619 FINAL 12182018 1246

Page 6 of 10

A8L0619


Certificate of Analysis

Notes:

· The Chain of Custody document and Sample Integrity Sheet are part of the analytical report.

· Any remaining sample(s) for testing will be disposed of according to BSK's sample retention policy unless other arrangements are made in

advance.

· All positive results for EPA Methods 504.1 and 524.2 require the analysis of a Field Reagent Blank (FRB) to confirm that the results are not

a contamination error from field sampling steps. If Field Reagent Blanks were not submitted with the samples, this method requirement has

not been performed.

· Samples collected by BSK Analytical Laboratories were collected in accordance with the BSK Sampling and Collection Standard Operating

Procedures.

· J-value is equivalent to DNQ (Detected, not quantified) which is a trace value. A trace value is an analyte detected between the MDL and the

laboratory reporting limit. This result is of an unknown data quality and is only qualitative (estimated). Baseline noise, calibration curve

extrapolation below the lowest calibrator, method blank detections, and integration artifacts can all produce apparent DNQ values, which

contribute to the un-reliability of these values.

· (1) - Residual chlorine and pH analysis have a 15 minute holding time for both drinking and waste water samples as defined by the EPA and

40 CFR 136. Waste water and ground water (monitoring well) samples must be field filtered to meet the 15 minute holding time for dissolved

metals.

· Summations of analytes (i.e. Total Trihalomethanes) may appear to add individual amounts incorrectly, due to rounding of analyte values

occurring before or after the total value is calculated, as well as rounding of the total value.

· RL Multiplier is the factor used to adjust the reporting limit (RL) due to variations in sample preparation procedures and dilutions required for

matrix interferences.

· Due to the subjective nature of the Threshold Odor Method , all characterizations of the detected odor are the opinion of the panel of

analysts. The characterizations can be found in Standard Methods 2170B Figure 2170:1.

· The MCLs provided in this report (if applicable) represent the primary MCLs for that analyte.

Definitions

mg/L: Milligrams/Liter (ppm)

mg/Kg: Milligrams/Kilogram (ppm)

µg/L: Micrograms/Liter (ppb)

µg/Kg: Micrograms/Kilogram (ppb)

%: Percent

NR: Non-Reportable

MDL: Method Detection Limit

RL: Reporting Limit: DL x Dilution

ND: None Detected at RL

pCi/L: PicoCuries per Liter

RL Mult: RL Multiplier

MCL: Maximum Contaminant Limit

MDA95: Min. Detected Activity

MPN: Most Probable Number

CFU: Colony Forming Unit

Absent: Less than 1 CFU/100mLs

Present: 1 or more CFU/100mLs

BSK is not accredited under the NELAP program for the following parameters: **NA**

Please see the individual Subcontract Lab's report for applicable certifications.

Certifications: Please refer to our website for a copy of our Accredited Fields of Testing under each certification.

Fresno

CA00079EPA - UCMR4 9254479Los Angeles CSD 4021-010NELAP certified

1180State of California - ELAP 4021State of Hawaii CA000792019-1State of Nevada

4021-010State of Oregon - NELAP C997-18State of Washington

Sacramento

2435State of California - ELAP

San Bernardino

9254478Los Angeles CSD 4119-003NELAP certified 2993State of California - ELAP

4119-003State of Oregon - NELAP

Vancouver

WA100008-011NELAP certified WA100008-011State of Oregon - NELAP C824-18bState of Washington





A8L0619 FINAL 12182018 1246

Page 7 of 10

Project Name: Chevron Lost Hills-2019 Post Closure Monitoring Project No.: 0075802017.003Date: 4/29-4/30/2019 Tested By: LT

Wet Soil

and Tare

(gr)

Dry Soil

and Tare

(gr)

Tare No.

Tare

Weight

(gr)

Moisture

Content

(%)

308.72 288.98 1 97.18 10.3

375.78 345.31 15 97.09 12.3

Page 1 of 1

Soil Description

Light Olive Brown (2.5Y, 5/4) Sandy Lean Clay (CL)

Olive Brown (2.5Y, 4/4) Sandy Lean Clay (CL)

MOISTURE CONTENTASTM D2216

Sample ID

Soil-2019-1.5

Soil-2019-3.0

Appendix C Time Concentration Charts

I:\7000s\7580.000\Archive\7580-192.xlsx

0

10

20

30

40

50

60

70Ja

n-04

Jan-

05

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06

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07

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09

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10

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11

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12

Jan-

13

Jan-

14

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15

Jan-

16

Jan-

17

Jan-

18

Jan-

19

Jan-

20

Con

cent

ratio

n, m

illig

ram

s pe

r lite

r

21MW-1 21MW-2 21MW-3 21MW-4

21MW-5 29MW-1 29MW-2 Cleanup Level

Explanation

06/07/2019LKP 0075802017

Boron ConcentrationsFormer Section 29 Surface Impoundments


C-1Date: By: Project No.:

Figure

I:\7000s\7580.000\Archive\7580-192C2-Ca TC

0

500

1,000

1,500

2,000

2,500

3,000

Jan-

04

Jan-

05

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06

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07

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08

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09

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10

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11

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12

Jan-

13

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14

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15

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16

Jan-

17

Jan-

18

Jan-

19

Jan-

20

Con

cent

ratio

n, m

illig

ram

s pe

r lite

r

21MW-1 21MW-2 21MW-3 21MW-4

21MW-5 29MW-1 29MW-2

Explanation

06/07/2019LKP 0075802017

Calcium ConcentrationsFormer Section 29 Surface Impoundments



Figure

I:\7000s\7580.000\Archive\7580-192C3-Cl TC

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

Jan-

04

Jan-

05

Jan-

06

Jan-

07

Jan-

08

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09

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10

Jan-

11

Jan-

12

Jan-

13

Jan-

14

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15

Jan-

16

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17

Jan-

18

Jan-

19

Jan-

20

Con

cent

ratio

n, m

illig

ram

s pe

r lite

r

21MW-1 21MW-2 21MW-3 21MW-4


Explanation

06/07/2019LKP 0075802017

Chloride ConcentrationsFormer Section 29 Surface Impoundments



Figure

I:\7000s\7580.000\Archive\7580-192C4-Na TC

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

10,000

Jan-

04

Jan-

05

Jan-

06

Jan-

07

Jan-

08

Jan-

09

Jan-

10

Jan-

11

Jan-

12

Jan-

13

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14

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15

Jan-

16

Jan-

17

Jan-

18

Jan-

19

Jan-

20

Con

cent

ratio

n, m

illig

ram

s pe

r lite

r

21MW-1 21MW-2 21MW-3 21MW-4

21MW-5 29MW-1 29MW-2

Explanation

06/07/2019LKP 0075802017

Sodium ConcentrationsFormer Section 29 Surface Impoundments



Figure

I:\7000s\7580.000\Archive\7580-192C5-So4 TC

0

500

1,000

1,500

2,000

2,500

3,000

3,500

Jan-

04

Jan-

05

Jan-

06

Jan-

07

Jan-

08

Jan-

09

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10

Jan-

11

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12

Jan-

13

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14

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15

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16

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17

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18

Jan-

19

Jan-

20

Con

cent

ratio

n, m

illig

ram

s pe

r lite

r

21MW-1 21MW-2 21MW-3 21MW-4

21MW-5 29MW-1 29MW-2

Explanation

06/07/2019LKP 0075802017

Sulfate ConcentrationsFormer Section 29 Surface Impoundments



Figure

I:\7000s\7580.000\Archive\7580-192C6-TDS TC

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

Jan-

04

Jan-

05

Jan-

06

Jan-

07

Jan-

08

Jan-

09

Jan-

10

Jan-

11

Jan-

12

Jan-

13

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14

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15

Jan-

16

Jan-

17

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18

Jan-

19

Jan-

20

Con

cent

ratio

n, m

illig

ram

s pe

r lite

r

21MW-1 21MW-2 21MW-3 21MW-4


Explanation

06/07/2019LKP 0075802017

Total Dissolved Solids ConcentrationsFormer Section 29 Surface Impoundments



Figure

Appendix D Cover Inspection Documents

Wood Environment & Infrastructure Solutions, Inc. 1281 East Alluvial Avenue, Suite 101

Fresno, CA 93720-2659 USA

T: 559-264-2535

www.woodplc.com


December 18, 2018 Project 0075802017 Ms. Linh Vo Chevron North America Exploration and Production 9525 Camino Media, Room C-1020 Bakersfield, California 93311 Subject: Post-Storm Impoundment Inspection and Repair Former Section 29 Surface Impoundments, Lost Hills, California Dear Ms. Vo: Wood Environment & Infrastructure Solutions, Inc. (Wood), has prepared this letter on behalf of Chevron North America Exploration and Production (Chevron) to describe post-storm inspection and repair activities at Chevron’s former Section 29 Surface Impoundments (impoundments) located in the Lost Hills Oil Field (Figure 1). Background information, inspection information, and repair documentation are presented in the following sections.

Background Waste Discharge Requirements Order No. R5-2013-0056 and its associated Monitoring and Reporting Program (MRP) were issued to Chevron on May 31, 2013, by the Central Valley California Regional Water Quality Control Board. The MRP includes two provisions for cover inspections: (1) an annual inspection to be performed after the rainy season has concluded, and (2) a post-storm inspection to be performed after significant rain events. In January 2018, the impoundment cover was re-seeded in areas of sparse vegetation, as recommended in the Annual 2017 Post-Closure Monitoring Report.1 In May 2018, the annual inspection was completed by Mr. Howard Barlow, Principal Geotechnical Engineer of Wood. In September 2018, Chevron performed a supplemental inspection. Wood and Chevron inspection documents were provided in the Annual 2018 Post-Closure Monitoring Report.2

Post-Storm Inspection After a rainfall event on October 2, 2018, Chevron personnel performed a post-storm inspection of the impoundments. The post-storm event inspection was performed in accordance with the MRP. During the

1 Amec Foster Wheeler, Inc., 2017, Annual 2017 Post-Closure Monitoring Report, Former Section 29 Surface Impoundments, Lost Hills, California, October 26. 2 Wood Environment & Infrastructure Solutions, Inc., 2018, Annual 2018 Post-Closure Monitoring Report, Former Section 29 Surface Impoundments, Lost Hills, California, October 17.

Ms. Linh Vo Chevron North America Exploration and Production

December 18, 2018 Page 2

inspection, Chevron personnel observed eight areas of potential storm water damage to the impoundment cover soil (Fi gure 2).

Recommendations Mr. Barlow reviewed photographs of the eight areas of potential storm water damage observed by Chevron personnel. The eight locations identified by Chevron personnel were sparsely vegetated. Shallow erosion rill s were observed in locations 2, 4, 5, 7, and 8. Repair in these areas was recommended to prevent progressive worsening of the erosion during future precipitation events.

Mr. Barlow recommend ed the following:

• Scarify the affected areas at least 5 feet on either side of the erosion to a depth of 3 inches, adding sufficient soil from the borrow area used to construct the cover to fill the erosion rills.

• Moisture-condition the soils to a moisture content above optimum.

• Compact the soils to a minimum of 85 percent of the maximum dry density as determined by ASTM International D 1557 test procedures.

• Re-seed the locations that exhibited sparse vegetation; re-seeding should take place during the rainy season so that a healthy vegetative cover may be established in these areas.

Repairs The impoundment cover was repaired in November 2018 under the supervision of Chevron personnel. The repairs were completed in accordance with the MRP and are described in Chevron 's 2018 Cover Repair Documentation (attached).

Wood appreciates being of service to Chevron. If you have any questions or need additional information, please contact us.

Sincerely, Wood Environment & Infrastructure Solutions, Inc.

Leslie K. Purvi s, LEP Environmental Scientist

/:\7000s\ 7580. 000\Archive\7580-170.docx

(Submitted Electroni cally)

Attachments: Figure 1 - Site Location Map

Principal Geotechnical Engineer

Figure 2 - Site Plan and Inspection Locations Chevron's Inspection and Repair Report

cc: Mr. Ron Holcomb, California Regional Water Quality Control Board

• • •

SITE

California

)

SITE

Lost HillsLo

s Rios

St

Lost

Hills

Rd

R 345

R 345

R 345

Brown M

ateria

l Rd

Holloway Rd

G P Rd

Lost

Hills

Rd

Paso Robles Hwy




Figure



Dat

e: 7

/10/

2018

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!A!A

!A

!A

!A

!A

1

2

34

5

6

7

8

G P Rd Sec. 20, Twp. 26S, Rng. 21ESec. 29, Twp. 26S, Rng. 21E

Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS,AeroGRID, IGN, and the GIS User Community

Site Plan and Inspection ObservationsFormer Section 29 Surface Impoundments



Figure

Basemap modified from

Date: 12/18/2018By: SCM

Date: 12/18/2018 Printed by: scott.mitchell2Path: N:\7000s\007580\gis\maps\2018\Post-Storm_Cover_Inspection\_fig02_SitePlan_InspLocs.mxd

0 250 500125

Approximate Scale in Feet

0 50 10025

Approximate Scale in Meters

Explanation

!A Erosion locations observed during October 8, 2018 post-storm inspection

Cover boundary

Linh Vo Environmental Specialist Health, Environment and Safety

San Joaquin Valley Business Unit Chevron North America Exploration and Production P. O. Box 1392 Bakersfield, CA 93302 Tel 661 654 7983 Fax 661 412 6034 Mobile 661-437-1546 [email protected]

Former Section 29 Surface Impoundments 2018 Cover Repair Documentation – Post Storm Lost Hills Oil Field, Kern County, California Background: On October 8, 2018, Chevron performed an inspection of potential storm water damage for the impoundments in accordance with the provisions of Waste Discharge Requirements Order No. R5-2013-0056 and its associated Monitoring and Reporting Program, which were issued to Chevron on May 31, 2013, by the Central Valley Regional Water Quality Control Board. Mr. Stone walked the impoundments to look for depressions in the cover, erosion gullies, and damage to the cover that could provide access for surface water to infiltrate the subsurface beneath the impoundment cover, if left uncorrected. Inspection Results: The eight locations of potential storm water damage were identified and photographed on October 8, 2018 by Mr. Stone, Chevron personnel. The eight locations identified by Mr. Stone were sparsely vegetated. Mr. Howard Barlow, Principal Geotechnical Engineer of Wood, reviewed the photographs and recommended to repair five locations (2, 4, 5, 7, and 8), which have shallow erosion rills in order to prevent progressive worsening of the erosion during future precipitation events. Mr. Barlow indicated that repair to the impoundment cover should consist of scarifying the affected area in a direction perpendicular to the slope of the cover for a distance of at least 5 feet on either side of the erosion and to a depth of 3 inches. If additional soil is required to fill the erosion rills, it should be obtained from the same borrow source that was used to construct the cover. The cover soil should be conditioned to a moisture content above optimum and compacted to a minimum of 85 percent of the maximum dry density as determined by ASTM International D 1557 test procedures. The reworked area should be reseeded before the start of the next rainy season so that a healthy vegetative cover may be established.


2

Cover Repairs Completed: On November 6, 2018, Sturgeon Services worked on behalf of Chevron to repair the erosion rill identified on the former Section 29 surface impoundment cover. Surface repairs were completed at 7 of the 8 locations. Location 4 could not be field verified; no erosion was observed in this location during later site visits, so no repairs were performed at this location. The soil surface at each site was scraped with a motor grader to an approximate depth of 1 foot. The soil was removed from the erosion areas and processed with water. Once the soil was processed, the soil was returned to the erosion areas and re-compacted with the wheel of the motor grader to reach 85% compaction. The area was then tested for compaction. Before and after photographs are provided to document the repair completed at each site. The photos used to show the “before” repaired condition were taken during the October 8, 2018 post storm inspection. Post repair photos provided for the site, represent the current condition at the location after the repairs were complete. Revegetation: Chevron will reseed the repaired areas during the rainy season, based on the amount of precipitation to promote the germination of the seed.

3

Before / After Photographs: Location #1 Before After

Location #2 Before After

4



Could not be field verified. Erosion was not observed during later site visits and no repairs were made.

5



6



1

Purvis, Leslie

From: Vo, Linh My <[email protected]>Sent: Monday, January 21, 2019 2:34 PMTo: Purvis, LeslieCc: Johnson, Jeffery WSubject: RE: DRAFT: post-storm inspection and repairs, former Section 29 impoundments

Hi Leslie, We had McCormick reseed the repaired areas on Dec 26, 2018. Please capture this in the next report. Thanks, Linh M. Vo ●● HES Specialist ‐ Project Development Support San Joaquin Valley Business Unit Chevron North America Exploration and Production 9525 Camino Media. Bakersfield, CA 93311 Tel: 661‐412‐6034 Cell: 661‐437‐1546 From: Purvis, Leslie <[email protected]> Sent: Tuesday, December 18, 2018 2:18 PM To: Vo, Linh My <[email protected]> Cc: Johnson, Jeffery W <[email protected]>; Barlow, Howard <[email protected]>; Charrette, Kalyn <[email protected]> Subject: [**EXTERNAL**] DRAFT: post‐storm inspection and repairs, former Section 29 impoundments Importance: High

Linh, The draft impoundment report by Wood is attached, for your review. Please provide comments or approval to publish at your earliest convenience; the final report should be uploaded to GeoTracker by December 20. Thanks, Leslie Purvis, LEP Technical Professional 3-Environmental Science Direct: 559-892-2921 Mobile: 559-307-7063 www.woodplc.com

Wood Environment & Infrastructure Solutions, Inc.

1281 East Alluvial Avenue, Suite 101

Fresno, CA 93720-2659

USA

T: 559-264-2535

www.woodplc.com


May 24, 2019

Project 0075802017

Ms. Linh Vo

Chevron North America Exploration and Production

9525 Camino Media, Room 2038B

Bakersfield, CA 93311

Subject: March 2019 Post-Storm Assessment and Repair

Former Section 29 Impoundments, Lost Hills Oil Field

Dear Ms. Vo:

Wood Environment & Infrastructure Solutions, Inc. (Wood), has prepared this letter on behalf of Chevron

North America Exploration and Production (Chevron) to describe post-storm inspection and repair

activities at Chevron’s former Section 29 Surface Impoundments (impoundments) located in the Lost Hills

Oil Field (Figure 1). Background information, inspection information, and repair documentation are

presented in the following sections.

Background

Waste Discharge Requirements Order No. R5-2013-0056 and its associated Monitoring and Reporting

Program (MRP) were issued to Chevron on May 31, 2013, by the Central Valley California Regional Water

Quality Control Board (RWQCB). The MRP includes two provisions for cover inspections: (1) an annual

inspection to be performed after the rainy season has concluded, and (2) a post-storm inspection to be

performed after significant rain events.

Post-Storm Inspection

On March 5, 2019, a rain event occurred at the Chevron former Section 29 impoundments. Chevron

personnel inspected the impoundments on March 12, 2019, and provided a post-storm report,

photographs, and GPS location information to Wood. Chevron requested that a Wood engineer review

the post-storm report and photographs and make repair recommendations as warranted.

Recommendations

Howard Barlow, Principal Engineer of Wood, reviewed the post-storm report and photographs, which

identified four areas of potential erosion. The general locations of the four areas are shown on Figure 2.

Mr. Barlow’s observations and recommendations are included in the following paragraphs.

Ms. Linh Vo Chevron North America Exploration and Production May 24,2019 Page 2

• Site 1: The main erosion is on a road that is apparently used as a shortcut across the cover of the closed surface impoundments. This appears to be an area of ongoing problems with erosion. This roadway should be blocked off and traffic routed around the perimeter of the closed surface impoundments. The roadway crossing the surface impoundments shou ld be scarified to a depth of 2 inches and vegetated. Continued use of the roadway crossing the cover wi ll lead to continuing erosion problems.

• Site 2: This appears to be an area that was recently repaired, but no new vegetation has been established. The erosion seen in the photographs is not severe enough to warrant regrading, but vegetation should be established before the erosion becomes worse.

• Site 3: The GPS coordinates provided by Chevron indicate that this area is adjacent to the eastern perimeter roadway. Erosion on the perimeter roadway may be repaired by regrading at a future

date. No action is required at this t ime.

• Site 4: The GPS coordinates provided by Chevron indicate that this site is also adjacent to the eastern perimeter roadway. Erosion on the perimeter roadway may be repaired by regrad ing at a future date. No action is required at this time.

Wood recommended that Chevron conduct repairs to the impoundment cover at Site 1. The MRP requ ires repairs to the impoundment cover be completed within 30 days of Chevron's inspection, or by April 12, 2019. Chevron should document repairs to the impoundment cover and take photographs of Site 1 after repairs are completed. The repair documentation should be reported to the RWQCB within 45 days of completion, or by May 27, 2019.

Repairs The roadway crossing the closed surface impoundments was blocked off as recommended by Wood. The impoundment cover at Site 1 was scarified in Apri l 2019 under the supervision of Chevron personnel and was subsequently re-compacted on May 8, 2019. The repairs were completed in accordance with the MRP and are described in Chevron's Cover Repair Documentation (attached).

Wood appreciates being of service to Chevron. If you have any questions or need additional information,

please contact us.

Sincerely, Wood Environment & Infrastructure Solutions, Inc.

Leslie K. Purvis, LEP Environmental Scientist

1:\ 7000s\7580.000\Archive\7580-180.docx

Howard D. Barlow, PE Principal Engineer

•• •

Ms. Linh Vo

Chevron North America Exploration and Production

May 24, 2019

Page 3

Attachments: Figure 1 – Site Location Map

Figure 2 – Site Plan and Erosion Locations

Chevron March 12, 2019, Post-Storm Report

Chevron Repair Documentation and Photographs

cc: Mr. Ron Holcomb, Central Valley Regional Water Quality Control Board

SITE

California

)

SITE

Lost HillsLo

s Rios

St

Lost

Hills

Rd

R 345

R 345

R 345

Brown M

ateria

l Rd

Holloway Rd

G P Rd

Lost

Hills

Rd

Paso Robles Hwy




Figure



Dat

e: 7

/10/

2018

Pr

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: sco

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!A

!A

!A

Site 1

Site 2

Site 3

Site 4

G P Rd Sec. 20, Twp. 26S, Rng. 21ESec. 29, Twp. 26S, Rng. 21E

Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS,AeroGRID, IGN, and the GIS User Community

Site Plan and Inspection ObservationsFormer Section 29 Surface Impoundments



Figure

Basemap modified from

Date: 5/22/2019By: SCM

Date: 5/22/2019 Printed by: scott.mitchell2Path: N:\7000s\007580\gis\maps\2019\Post-Storm_Cover_Inspection\_fig02_SitePlan_InspLocs.mxd

0 250 500125

Approximate Scale in Feet

0 50 10025

Approximate Scale in Meters

Explanation!A Erosion locations observed during March 12, 2019 post-storm inspection

Cover boundary

STORM EVENT INSPECTION FORM

Name of inspector Brandon Hoehn

Date of storm event 3/5/19 (1.42”)

Date of inspection 3/12/19

Inspection location Section 29 Surface Impoundments, Lost Hills, California

Inspected site coordinates

Latitude Longitude

Site 1 35.38.21N 119.43.42W

Site 2 35.38.22N 119.43.44W

Site 3 35.38.24N 119.43.43W

Site 4 35.38.29N 119.43.48W

Recommendations from Certified Engineer for repairs

Date of damage repaired

Inspected site photos Before repair After repair

Site 1 Site 1 [insert photo]




Date of soil compaction test

Date of revegetation

Additional Comments

Jeff Johnson Environmental Specialist Health, Environment and Safety

San Joaquin Valley Business Unit Chevron North America Exploration and Production P. O. Box 1392 Bakersfield, CA 93302 Tel 661 654 7983 Mobile 661-599-5322 [email protected]

Former Section 29 Surface Impoundments 2019 Cover Repair Documentation – Post Storm Lost Hills Oil Field, Kern County, California Background: On March 5, 2019, a precipitation event occurred in Lost Hills, CA. On March 12, 2019 Chevron performed post storm inspection of the former Section 29 surface impoundments in accordance with the provisions of Waste Discharge Requirements Order No. R5-2013-0056 and its associated Monitoring and Reporting Program, which were issued to Chevron on May 31, 2013, by the Central Valley Regional Water Quality Control Board. Mr. Brandon Hoehn walked the impoundments and completed a post storm inspection of the pond cover identifying any depressions, erosion, and any other pond cover damage. Inspection Results / Cover Repair Recommendations: Four locations of erosion were identified and photographed. The results of the post storm inspection were submitted to Wood plc on March 13, 2019 for review and repair recommendation. Mr. Howard Barlow, Principal Geotechnical Engineer of Wood, reviewed the photographs and GPS locations provided by Chevron for the 4 sites where erosion was noted on the Section 29 Closed Surface Impoundments cover. Mr Barlow’s assessment was, of the 4 sites identified, only Site #1 required repair. Site 1: The main erosion is on a road crossing the cover for the closed surface impoundments that is apparently used as a shortcut. This appears to be an area of on-going problems with erosion. This roadway should be blocked off and traffic routed around the perimeter of the closed surface impoundments. The roadway crossing the surface impoundments should be scarified to a depth of 2 inches and vegetated. Continued use of the roadway crossing the cover will lead to continuing erosion problems.


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Site 2: This appears to be an area that was recently repaired, but no new vegetation has been established. The erosion seen in the photographs is not severe enough to warrant regrading, but vegetation should be established before the erosion becomes worse. Site 3: The GPS coordinates provided by Chevron indicate that this site is adjacent to the perimeter roadway. Erosion on the perimeter roadway may be repaired by regrading at a future date. No action is required at this time. Site 4: The GPS coordinates provided by Chevron indicate that this site is adjacent to the perimeter roadway. Erosion on the perimeter roadway may be repaired by regrading at a future date. No action is required at this time. Cover Repairs Completed: Site #1 was repaired in accordance with the Wood plc recommendation. The ends of the shortcut road were bermed and barricaded with high visibility barrier fencing to route traffic around the perimeter of the impoundments. Preliminary repair was completed on April 17, 2019. Subsequent site preparation and final compaction was completed on May 9, 2019. Photographs documenting the post repair condition of Site #1 were taken May 22, 2019. Before and after photographs have been provided to Wood plc to document the repair completed at Site #1. The photos used to show the “before” repaired condition were taken during the March 12, 2019 post storm inspection. Post repair photos taken May 22, 2019, represent the current condition at Site #1 after the repairs were complete. Photographs are attached. Perimeter road regrading will be completed at a future date. Revegetation: Chevron will reseed the repaired areas prior to the Fall/Spring rainy season, in anticipation of precipitation that will promote seed germination and plant growth.

I:\7000s\7580.000\From Others\Chevron\PondInspections\2019-0305_Post-Storm\2019_PondPhotos.xlsx, Site 1 Insp, 5/23/2019

Note: Photographs provided by Chevron.

05/22/19LKP 0075802017

Site 1 InspectionFormer Section 29 Impoundments

Lost Hills Oil Field, California

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Date: By: Project No.:

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I:\7000s\7580.000\From Others\Chevron\PondInspections\2019-0305_Post-Storm\2019_PondPhotos.xlsx, Site 1 Repairs, 5/23/2019


05/22/19LKP 0075802017

Site 1 RepairsFormer Section 29 Impoundments


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San Joaquin Valley SBU Chevron North America Exploration and Production 15255 Lost Hills Rd Lost Hills, CA 93249

2019 Annual Closure Inspection

Chevron Lost Hills Perc Ponds

In 2008-09, the Perc Ponds at Chevron Lost Hills were closed. The following are observations made from

an inspection of the former Perc Pond Facility.

Inspection: August 20, 2019

Inspector: Brandon Hoehn (Chevron Health, Environment and Safety Specialist)

Location: Former Perc Ponds Section 29 Lost Hills Field.

Condition of the surface cap: No ponding took place on the cap. The small amount of annual rain (less

than 6 inches/year) along with the established vegetation growing on the surface has prevented significant

erosion of the cap.

Established Growth: Extensive amounts of growth have taken place across the surface of the former

facility.

Attachments: Pictures of facility (All pictures taken 8/20/2019)

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1) N 35.639532°, W 119.728387° Looking Northwest

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2) N 35.640580°, W 119.729243° Looking Southwest

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3) N 35.644407°, W 119.732417° Looking Southwest

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4) N 35.644207°, W 119.734456° Looking Southeast

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5) N 35.642112°, W 119.732895° Looking Northeast

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6) N 35.638600°, W 119.729133° Looking Northeast