1

Rodriguez, Dante

From: Zimmerman, Chuck <CZimmerman@brwncald.com>Sent: Friday, July 10, 2015 10:49 AMTo: Seter, DavidCc: 'Oman, Jack'; Ball, Harold; Rodriguez, Dante; jrcollins@ndep.nv.gov; Jeryl Gardner;

'Phyllis P. Hunewill'; 'tgrady@asm.state.nv.us'; manager@yerington.net; cynthiaoceguera8@gmail.com; 'Halsey, Ronald H'; Dunkelman, Tom; 'Brian.S.Johnson@bp.com'; james.nolan@bp.com; Gallery, Patricia A (patricia.gallery@bp.com); James.Lucari@bp.com; Helmlinger, Andrew; 'Tom Bowden'; 'Taurus Massey'; 'sdischler@quaterra.com'; 'John Batchelder'; 'chairman@ypt-nsn.gov'; environmentaldirector@ypt-nsn.gov; ghatch@ypt-nsn.gov; 'preacherpauly@earthlink.net'; dmcginnis@sbcglobal.net; 'david@periandsons.com'; Isham, Julian; McMillan, John (CFS); 'Ken.Greene@CH2M.com'; 'Victor.Early@ttemi.com'; 'Colin.Lee@tetratech.com'; 'Chatham, James R'; 'Duffy, William'; 'tpatton@quaterra.com'; 'mmcfalls@wrpt.us'; 'ROB LOVEBERG'; Adam.Cohen@dgslaw.com; drdavis@blm.gov; 'Sunny091929@aol.com' (Sunny091929@aol.com)

Subject: June 2015 Monthly Report for the Yerington Mine SiteAttachments: June 2015 Monthly Report.pdf; Arimetco FMS June 2015 Monitoring Data.pdf

Categories: A08 - Arimetco

Dave: The June 2015 monthly report for the Yerington Mine Site is attached, along with the monthly Arimetco Fluid Management System (FMS) monitoring data. The original will be sent to you today by certified mail. Hard copies will be sent via regular mail to the Lyon County Library, Chairwoman Howard, Ginny Hatch, Dietrick McGinnis, Chairwoman McFalls, Cynthia Oceguera and Peggy Pauly. This e-mail serves as the submittal for the remainder of the copied recipients. Please forward this e-mail to others who may be interested in the June 2015 monthly report. Regards, Chuck Zimmerman Vice President Brown and Caldwell CZimmerman@brwncald.com T 775.283.0810 | C 775.233.5575

SEMS-RM DOCID # 1162037

Atlantic Richfield Company

Jack Oman ~Manager

JuJy 10, 2015

CERIFED- RETURN RECEIPT REQUEl'IE)

Mr. Dave Seier Remadlal Project Manager U.S. Enllirunmenlal PruCacliDn Agency- Region 9 75 Hawthorne S1rwt, SFD-9-1 sen Frandlco, CA 94105

4 centlerpolnle Drive LaPllma, CA. 110623-1066 (657) 529-4581 office (714) 67<Mi1t5 fax JIClc.omari@bp.com

June .201& lllonthly Repolf, Ytlffllllon Mlm Site, Lyan CDU11f¥, Nevada:

Dear Mr. 8el!er.

Admlnla1Hdlw8 Oftler ro, Rtmedlal lnVNQgatlon and Fwlllllty ltlldy (Rff'S), CERCLA Docat No. 9-2007-0IIOS; A*'lrllltlaaw Order on COlllent, CERCLA Docat No. ot-200M010

Pu111Ua1t to the abow lllferenced onl11111 ltsued by the U.S. Envtonmental Protacllon Agency - Region 9 (EPA), Atlantic Richfield Company (ARC) ta preparad this June 201 & monthly report for RUFS aid Operations and Maintanance (oaM) aclivitiea at the Yerington Mine Site (Sita).

Jum .201& .Aclvltl•

Sito &en 1r1v and O&M Acitifaes • Coni,iued Sltll O&M, security and bird detenant actlvltlN. C8menll at various locatlonl (e.g.,

Main and Amlatco gatee, entrancea to buildings) indimtad no actMty of concam. • Wind dancers, bird delttrent flage, Wtllande W8iln and Bird Gerd IDWWII continued 1D be

deployed In accordance wttll Iha current EPA-apprond bird deterrent approecll. Balloon• remained In pla:a 01111r FMS Evaporation Ponds B and C. To reduca birds from becoming habituated ID the pwnca Df wind d811C8111 and flags, th- davil:ae -re re-localad BB naailad. Bird Gani tOWMI 'A', 'B' and 'C' ftAI in opentlion during the entire monlh of June due to predplldon events (a llolal or 1.04 lnclles or rain was record~ at on-Site rain gages In June}.

• Rallac1lw My!.- bird dalerrant dlw!DBB ware deployed at Iha Slot pond, VL T pond and on three binl mitigation flaga. Continued Iha EP.Mlpprovad bn mitigation achadula. wilh at 1111181: lhrae moniloring vilils per day at all ponds plue a fourth monitoring vilit at the Arimlblo FMS ponde. OblerVallon, were made wltllln 1111r an hour of daWn end diak 1nd during mid-day.

• PINS Pond water llwala: North Call • 0.01'1181; Mlddle Call• 0.01'881; South Call • 0.1 fllet. • Arimalco FMS pond level&: Ph- 1 Pond= 4.82 f1lat; FMS Evapcntion Pond A= 9.36 f1lat; FMS

EVapora11on Pond B = 3.91 feet FMS Evapol'lllon Pond C = 5.92 reet; VL T Pond = 12.66 reet; Slol Pond = 18.17 feel The freeboerd level In FMS Evaporation Pond A on June 30 WN appmldmataly 0.88 feat No fluid tranlfars oca1rrad In Juna. Sea atlachad llllllll!Drlng dala.

• Approximalaly 38,424 gallons of aolution W81'8 pumped from Iha leak dated.en in Jurm including 10,061 gallons from the VLT Hetp Leech Pad (HLP) and 2,909 GIiion, from Ille VL T Bedlmeftt Pond, and 23,384 gallona 1kom !tie Slot (HLP) pellmeter coll8*11 dtt.ch. Appmldmately 171,644 gallon& of allkln have bw, pumped from Iha leak dalectol'B alnca January 1, 2016. Saa allBchad monitoring data.

A BP affiliated company d

Mr. Dave Seter Yerington Monthly Report July 10, 2015 Page 2 of 4

June 2015 Activities - Continued

Site Security and O&M Activities - Continued • Finalized and transmitted the hydraulic (fill) testing and Phase 1 Pond management plans on

June 3 to EPA and NDEP for the Arimetco FMS. EPA directed ARC to initiate these activities on June 9. The Phase 1 Pond improvements (dike installation and modified pumping equipment) were initiated and completed on June 25. During the remaining five days in June, approximately 775 gallons were pumped from the new Phase 1 dike to FMS Evaporation Pond C.

• A wind dancer was observed to be missing on June 22, and a police report was filed. Fawcett Engineering was on Site on June 24 to complete the re-wiring of two wind dancers.

• A tour of select Arimetco FMS components was provided to Dante Rodriguez (EPA).

Site Characterization Activities • Site-wide monthly groundwater elevation measurements were obtained June 29-30 at wells

outfitted with pressure transducers and new monitor wells. • A Pit Lake water elevation of 4,234.0 feet amsl was recorded on June 30, 2015 from the pressure

transducer, an increase of 0.13 feet since May 30, 2015. The pit lake elevation has risen 1.96 feet since June 30, 2014.

• No changes to the Domestic Well Monitoring Program. • Completed the 2Q 2015 domestic well monitoring event June 9-10. • Based on the analytical results from DW-212, initially sampled in May, three locations (DW-17,

DW-138, and DW-212) were added to the Bottled Water Program in June (DW-212 has four residential trailers on Peri property with agricultural worker families residing in three trailers).

• Transmitted the 2014 Annual Groundwater Monitoring Report (GMR) on June 19. • Continued the compilation of data for inclusion in the 1Q 2015 GMR and the 1Q 2015 Domestic

Well Monitoring Report (DWMR). • Transmitted the Data Summary Report (DSR) for the Supplemental Monitor Well Installation

program to EPA on June 11 . • Initiated the start of monitor well drilling, construction, development and testing at the B/W-63 well

cluster on June 10. The zonal sampling borehole was advanced to 437 feet below ground surface and 15 zonal samples were collected.

• Continued the compilation of data for inclusion in the Background Groundwater Water Quality Assessment (BGQA - Revision 2).

• Continued preparation of the revised Geochemical Characterization DSR and geochemical modeling of groundwater quality data.

• Phase 1 a characterization around the Evaporation Ponds (OU-4a) was completed on June 6. Before leaving the Site, all borings were plugged and abandoned per State of Nevada regulations. Groundwater samples were collected from EP-GW-2 and EP-GW-7. Geotechnical testing and materials sampling activities in June were performed at EP-GT-1, EP-GT-12 and EP­GT-13. Initiated the compilation of OU-4a groundwater and geotechnical for transmittal to EPA, NDEP and other project stakeholders.

• Continued work on the conceptual site model (CSM) and data quality objectives (DQOs) for the Wabuska Drain (OU-7) RI Work Plan, and the development of the first characterization phase of the Field Sampling and Analysis Plan (FSAP).

• Routine database management activities in support of Site investigations and monitoring.

Planned July/August 2015 Activities

Site Security and O&M Activities • Continue routine Site O&M, security and bird deterrent activities. • As needed, meet with EPA and NDEP to discuss any outstanding Arimetco FMS issues. • Implement the hydraulic (fill) testing plan for FMS Evaporation Ponds B and C.

Mr. Dave Seter Yerington Monthly Report July 10, 2015 Page 3 of4

Planned July/August 201& ActlvltlN - Continued

Site Characterization .Activities • Continue groundwater elevatlon and pit lake level measurements, and meteorologlcal monitoring. • Continue lhe Bottled Water Program. • Continue to complle groundwater and domestic well monitoring data for lnduslon In the 1Q 2015

GMR and DWMR, and transmit the 1Q 2015 DWMR. • Prepare for and implement the 3Q groundwater monitoring event in August • Continue discussions with EPA regarding the proposed parameter reduction list for routine

quarterty groundwater sampling. • Continue drilling, zonal sampling and monitor well installation activities at the B/W-83 well duster. • Complete and transmit the BGQA - Revision 2. • Transmit OU-48 groundwater and geotechnical data to EPA, NDEP and other stakeholders from

Phase 1 a activities. Aa needed, compile the field and analytical data for indusion in a DSR. • Continue discussions with EPA regarding the OU-1 and OU-3 Human Heatth Risk Assessments. • Continue wortcing on responses to comments from EPA dated March 16 on the Process Areas

(OU-3) Step-Out Characterization DSR, and the development of a Process Areas RI Report starting with a scoping discussion with EPA.

• Transmit to EPA the DQOs and CSM for the Wabuska Drain (OU-7) RI prior to the submittal of a phased Field Sampling and Analysis Plan.

• Prepare for and attend OU-1 end OU-4 technical meetings on August 5 and 6, respectively. • Prepare for and attend a Yerington Community Meeting on August 6.

Please contact me at (657) 529-4581 or via e-mail at jack.oman@bp,com if you have any questions or comments about the June 2015 monthly report

Sincerely,

J~-JackOman Project Manager

Attachment

cc: Hany Ball, EPA - via electronic mail Dante Rodriguez, EPA - via electronic mail Andrew Helmlinger, EPA - via eleclronic mail Tom Dunkelman, EPA-via electronic mail Jeff Collins, NDEP - via electronic mail Jeryl Gardner, N DEP - via electronic mail Dave Davis, BLM -via electronic mail Dan Newell, City of Yerington -via electronic mail Phyllis Hunewill - via electronic mail Jim Sanford, MVEC - via electronlc mall Tom Grady, Nevada State Assembly-via electronlc mall Chairwoman Howard, YPT -via electronlc mall Ginny Hatch, YPT -via electronic mall Deborah Dunn, YPT - via electronlc mall Dietrick McGinnis, McGinnis and Associates - via electronic mail Tom Bowden, Ridolfi, Inc. -via electronic mail Chairwoman McFalls, WRPT - via electronic mail

Mr. Dave Seter Yerington Monthly Report July 10, 2015 Page 4 of 4

Cynthia Oceguera, WRPT - via electronic mail Ron Halsey, Atlantic Richfield Company - via electronic mail James Nolan, Atlantic Richfield Company - via electronic mail James Lucari, Atlantic Richfield Company - via electronic mail Patricia Gallery, Atlantic Richfield Company - via electronic mail Brian Johnson, Atlantic Richfield Company - via electronic mail John Batchelder, EnviroSolve - via electronic mail Jim Chatham, Atlantic Richfield Company - via electronic mail Adam Cohen, Davis Graham & Stubbs - via electronic mail Bill Duffy, Davis Graham & Stubbs - via electronic mail Tom Patton, Singatse Peak Services, LLP - via electronic mail Steve Dischler, Singatse Peak Services, LLP - via electronic mail Taurus Massey, Singatse Peak Services, LLP - via electronic mail David Peri, Peri and Sons - via electronic mail John McMillan, CBI - via electronic mail Julian Isham, CBI - via electronic mail Victor Early, Tetra Tech - via electronic mail Colin Lee, Tetra Tech - via electronic mail Ken Greene, CH2M Hill - via electronic mail Peggy Pauly, YCAG-via electronic mail Lyon County Library System Central

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28000 Evaporation Pond B Flow = 0 gallons

- Evaporation Pond C Flow= 160,444 gallons or 3.48 gpm 0.9

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- Precipitation * 22000

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2015 Monthly Leak Detector Data

Leak Detector ID1 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year To Date

Total (Gallons)

Units G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D

w w w w w w VLTSP 17,390

3,922.0 126.5 702.9 2,770.0 98.9 549.6 1,606.0 53.5 297.4 3,164.0 102.1 585.9 3,019.0 100.6 559.1 2,909 97.0 538.7

VLTP1 D D D D D D

0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

w w w w w w VLTD1 42,530

12,920.0 416.8 5,730.0 204.6 4,101 .0 136.7 3,044.0 98.2 6,951 .0 231 .7 9,784 326.1

w w w w w w VLTD2 5,279

1,124.0 36.3 1,076.0 38.4 1,11 7.0 37.2 896.0 28.9 789.0 26.3 277 9.2

VLTD3 D D D D D D

0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

Tot VLTD1 + D2 + D3 14,044.0 453.0 8.1 6,806.0 243.1 4.3 5,218.0 173.9 3.0 3,940.0 127.1 2.3 7,740.0 258.0 4.5 10,061 .0 335.4 6.0

D w w w w w EP"B" 1,282

0.0 0.0 0.0 1,200.0 42.9 39.0 42.0 1.4 1.3 0.0 0.0 0.0 0.0 0.0 0.0 40.0 0.0

EP"C" D D D D D D

0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

IFX w w w w w w

458 91 .0 2.9 61 .0 2.2 43.0 1.4 39.0 1.3 194.0 6.5 30 1.0

II FX w w w w w w

125 38.0 1.2 32.0 1.1 14.0 0.5 23.0 0.7 18.0 0.6 0.0 0.0

Ill FX D D D D D D

0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

Tot 1FX+ 2FX + 3FX 129.0 4.2 0.1 93.0 3.3 0.1 57.0 1.9 0.0 62.0 2.0 0.0 212.0 7.1 0.1 30.0 1.0 0.02

SSP1 D D D D D D

0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

w w w w w w SD1 104,552

8,988.0 289.9 7,138.0 254.9 17,757.0 591 .9 22,380.0 721.9 24,905.0 830.2 23,384 779.5

SD2 D D D D D D

0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

SD3 D D D D D D

0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

Tot SD1 + SD2 + SD3 8,988.0 289.9 4.4 7,138.0 254.9 3.9 17,757.0 591 .9 8.7 22,380.0 721 .9 11 .3 24,905.0 830.2 12.2 23,384.0 779.5 11 .8

MD1 w w w w w D

28 21 .0 0.7 0.01 7.0 0.3 0.01 0.0 0.0 0.00 0.0 0.0 0.00 0.0 0.0 0.00 0.0 0.0 0.00

Total 27,104 18,014 24,680 29,546 35,876 36,424 0 0 0 0 0 0 171,644

Notes: 1) Leak Detector Locations shown on Figure 2-1 of the 2015 Annual O&M Report (March 31 , 2015)

2) W = Wet; and D = Dry ("Wet" and "Dry" visual observations)

3) G/M = Gallons per Month

4) G/D = Gallons Per Day

5) G/Ac-D = Gallons per Acre per Day (monthly average)

6) VL T Sediment Pond Area = 0.18 acres

7) VL T Pond Area = 1.25 acres

8) Slot Sediment Pond Area = 0.18 acres

9) Slot Pond 2 Area = 1.1 acres

10) Evaporation Pond B Area = 1.1 acres

11) Evaporation Pond C Area = 1.1 acres

12) Slot Heap Leach Pad (HLP) Area= 66 acres

13) VLT HLP Area= 56 acres

14) Phase Ill 4X HLP Area= 47 acres

15) Phase Ill South HLP Area= 48 acres

16) Individual HLP perimeter collection ditch leak detector flows combined (Tot VL T 01 +02+03, Tot 1 FX+2FX+3FX, and Tot SD1 +SD2+SD3) for estimating flows in Gallons per Acre per Day (G/Ac-D)