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RE: Human Health Risk Assessment Addendum at the West Highway 6 & Highway 281 Site, Hastings, Nebraska. Contract No. EP-S7-05-05; Task Order No. 0012 EPA Task Order Project Officer: Brian Zurbuchen

Dear Ms.-:

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HydroGeoLogic, Inc. (HGL) is pleased to submit one electronic copy on CD and one hard copy of the Human Health Risk Assessment Addendum Technical Memorandum for the West Highway 6 & Highway 281 Site, Hastings, Nebraska. This addendum was prepared to respond to a request from the U.S. Environmental Protection Agency to update the HHRA to reflect current toxicity information and to assess the contribution of background constituents to the cumulative cancer risks and non-cancer hazard indices. The draft document was revised to include EPA comments received on June 13, 2016. and a summary of the responses to these comments is also attached. Two hard copies and one electronic copy of these documents is concurrently being transmitted to Ms. Laurie Brunner at the Nebraska Department of Environmental Quality.

Should you have any questions or comments, please contact us at

Sincerely,

Enclosures

cc: Ms. Laurie Brunner, NDEQ, w/ enclosures

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6340 Glenwood, Suite 200, Bu ii ding #7, Overland Park, KS 66202 -------------- Phone: (913) 31 7-8860 Fax: (913) 225-8091 ---------------

www.hgl.com

HUMAN HEALTH RISK ASSESSMENT ADDENDUM

WEST HIGHWAY 6 & HIGHWAY 281 SITE

HASTINGS, NEBRASKA

TO: Brian Zurbuchen, Ph.D., EPA TOPO

FROM: P.E.

THROUGH: P.G., TOM

DATE: June 24, 2016

SUBJECT: Human Health Risk Assessment Addendum West Highway 6 &

Highway 281 Site, Hastings, Nebraska

CONTRACT NO: EP-S7-05-05

TASK ORDER NO: 0012

This technical memorandum presents an addendum to the Human Health Risk Assessment (HHRA)

for the West Highway 6 & Highway 281 Site in Hastings, Nebraska that was finalized and

approved in 2011 as part of the Revised Final RI Report (HGL, 2011a). This addendum was

prepared to respond to a request from the U.S. Environmental Protection Agency (EPA) to update

the HHRA to reflect current toxicity information and to assess the contribution of background

constituents to the cumulative cancer risks and non-cancer hazard indices (HIs). Note that no site

data collected after completion of the 2011 HHRA have been included in this HHRA Addendum.

Additional components of the 2011 HHRA, such as screening values and exposure point

concentrations, were not revised or changed as part of this HHRA Addendum. For consistency,

the table numbering used within the HHRA Addendum parallels the 2011 HHRA. For example,

Table 4.1 from the 2011 HHRA was updated and is presented herein as Table 4.1-Rev. Each

component of the HHRA Addendum is discussed below.

1.0 TOXICITY VALUE UPDATE

Toxicity values have been updated since the HHRA was completed in 2011. In addition, since

2011 TCE has been identified as a mutagen for the kidney portion of the inhalation unit risk, and

a relative bioavailability factor of 0.6 has been developed for arsenic. The toxicity values and

target organs used in the 2011 HHRA were updated in accordance with the hierarchy outlined in

the 2003 Office of Solid Waste and Emergency Response (OSWER) Directive 9285.7-53 (EPA,

2003). The toxicity values, as well as non-cancer and carcinogenic toxicity information, are

presented in Tables 4.1-Rev through 4.4-Rev. The updated toxicity values are shown in yellow

highlighting. For chromium, the hexavalent chromium toxicity values were used based on the

assumption that all chromium at the site is in the hexavalent form.

In addition to the updated toxicity values, the attenuation factor used within the vapor intrusion

risk calculations has also been revised since the 2011 HHRA. The 2011 HHRA used an attenuation

factor of 0.1. In 2015, EPA decreased the default attenuation factor for sub-slab soil gas to 0.03

as part of the OSWER Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway

HydroGeoLogic, Inc. – Human Health Risk Assessment Addendum – West Highway 6 & Highway 281 Site

Highway 6 & 281 Site TM – Human Health Risk Assessment Addendum 2 April 2016

from Subsurface Vapor Sources to Indoor Air (EPA, 2015). To reflect current guidance, the current

attenuation factor of 0.03 was incorporated into the vapor intrusion risk calculations for applicable

receptors as part of the HHRA Addendum.

2.0 RISK CHARACTERIZATION UPDATE

After updating the toxicity values, the risk characterization was revised to reflect the most current

toxicity information. The risk characterization was revised in accordance with the methodology

outlined in the HHRA (HGL, 2011a). The updated carcinogenic and non-carcinogenic human

health risk estimates for each exposure scenario evaluated in the risk assessment are presented in

Tables 5.1-Rev through 5.33-Rev. Changes from the 2011 HHRA are highlighted yellow. The

calculated risks were compared to the EPA’s target cancer range of 10-6 to 10-4 for carcinogenic

effects and an HI of 1 on a target organ basis for non-carcinogenic effects (EPA, 1991).

As stated, one of the objectives of the HHRA Addendum was to incorporate the results of the

background evaluation into the risk characterization, as metals occur naturally in the environment

and some of the inorganic COPCs may reflect background conditions. To identify which COPCs

were naturally occurring, the site soil and groundwater data were statistically compared to the

background concentrations listed in Technical Memorandum – Background Metals, which was

included as Appendix K of the 2011 RI Report (HGL, 2011a) and in the Revised Final Background

Metals Study Addendum (HGL, 2011b). The background comparison identified the following

metals as background constituents:

On-site surface soil:

o aluminum, arsenic, cobalt, and manganese;

On-site subsurface soil:

o aluminum, arsenic, cobalt, and manganese;

On-site groundwater:

o arsenic, cobalt, iron, and manganese; and

Off-site groundwater:

o arsenic, total chromium, hexavalent chromium, cobalt, iron, and manganese.

To characterize the site-related risks, the cancer risks and non-cancer hazard quotients (HQs)

associated with the above metals were subtracted from the cumulative risks and HIs listed in

Tables 5.23-Rev through 5.33-Rev. Tables 5.34 through 5.44 present the total non-cancer HI

and cancer risk values associated with exposure to site-related contaminants (i.e., excludes the

background constituents listed above).

The following subsections present the updated cancer risks and HIs, and compare the values to

those presented in the 2011 HHRA. The site-related risks and HIs are also presented. The 2016

HHRA Addendum risks, both total and site-related, and the 2011 HHRA risks are summarized in

Table 1.



2.1 CURRENT INDOOR INDUSTRIAL WORKER

The current indoor industrial worker was evaluated for exposure to COPCs in surface soil via

incidental ingestion and inhalation, and to sub-slab soil gas COPCs via vapor intrusion. The

potential risks to the current indoor industrial worker are presented in Tables 5.23-Rev and 5.34,

and are summarized below.

Non-Cancer HI Cancer Risk

2011 HHRA 0.2 4.6E-04

2016 Updated HHRA – Total Risk 2 7.5E-05

2016 Updated HHRA – Site-Related Risk 2 7.4E-05

As shown above, the total HI increased from 0.2 to 2, exceeding the target value of 1. The increase

was due to the updated RfC values for 1,4-dioxane, PCE, and TCE. Because the HI exceeded 1,

the HHRA Addendum quantified the HI on a target organ basis. The target organ HI for the liver

and kidney exceed 1 (each were estimated to be 1.3 and are due entirely to 1,4-dioxane), indicating

potential non-cancer hazards exist for the current indoor industrial worker receptor. The cancer

risk for all COPCs decreased from 4.6E-04 in 2011 to 7.5E-05 in 2016, which is within the EPA

target risk range of 10-6 to 10-4. The decrease was primarily a result of the incorporation of the

2015 attenuation factor into the vapor intrusion risk calculations.

2.2 FUTURE INDOOR INDUSTRIAL WORKER

The potential exposure routes for the future indoor industrial worker are incidental ingestion and

inhalation of COPCs in future surface soil, and inhalation of sub-slab soil vapors via vapor

intrusion. The potential risks to the future indoor industrial worker are presented in Tables 5.25-

Rev and 5.36, and are summarized below.


2011 HHRA 0.3 4.7E-04



As shown above, the total HI increased from 0.3 to 2, exceeding the target value of 1. Similar to

the current indoor industrial worker, this increase was due to the updated RfC values for 1,4-

dioxane, PCE, and TCE. The target organ HI for the liver and kidney exceed 1 (each were

estimated to be 1.3 and are due entirely to 1,4-dioxane), indicating potential non-cancer hazards

exist for the future indoor industrial worker receptor. The cancer risk for all COPCs decreased

from 4.7E-04 in 2011 to 8.3E-05 in 2016, which is within the EPA target risk range of 10-6 to

10-4. The decrease was primarily a result of the incorporation of the 2015 attenuation factor into

the vapor intrusion risk calculations.

2.3 CURRENT OUTDOOR INDUSTRIAL WORKER

The potential exposure routes for the current outdoor industrial worker are exposure to COPCs in

surface soil via ingestion, dermal absorption, and inhalation. The potential risks to the current

outdoor industrial worker are presented in Tables 5.24-Rev and 5.35, and are summarized below.




2011 HHRA 0.02 4.9E-06

2016 Updated HHRA – Total Risk 0.02 4.0E-06

2016 Updated HHRA – Site-Related Risk 0.004 2.2E-06

The cumulative cancer risk decreased slightly with the updated toxicity values. The total HI is less

than the target value of 1, and the total cancer risk is on the low end of the EPA target risk range.

Site-related COPCs do not pose an unacceptable threat to the current outdoor industrial worker.

2.4 FUTURE OUTDOOR INDUSTRIAL WORKER

The future outdoor industrial worker was evaluated for exposure to COPCs in future surface soil

via ingestion, dermal absorption and inhalation. The potential risks to the future outdoor industrial

worker are presented in Tables 5.26-Rev and 5.37, and summarized below.


2011 HHRA 0.05 2.2E-05



The revised toxicity values slightly decreased the total cancer risk. The total HI is less than the

target value of 1, and the total cancer risk is on the low end of the EPA target risk range. Site-

related COPCs do not pose an unacceptable threat to the current outdoor industrial worker.

2.5 FUTURE CONSTRUCTION WORKER

The future construction worker was evaluated for exposure to COPCs in surface/subsurface soil

via ingestion, dermal absorption and inhalation. The potential risks to the future construction

worker are presented in Tables 5.27-Rev and 5.38, and are summarized below.


2011 HHRA 5 1.7E-05



The total cancer risk decreased slightly between 2011 and 2016. The total HI remains greater than

the target value of 1. The site-related HI, however, is less than 1. The majority of the total HI is

due to aluminum and manganese, which were both identified as background constituents. The site-

related cancer risk is within the EPA target risk range of 10-6 to 10-4. The site-related COPCs do

not pose an unacceptable threat to a future construction worker under the assumed exposure

conditions.

2.6 CURRENT TRESPASSER

The current trespasser was evaluated for exposure to COPCs in surface soil via ingestion, dermal

contact, and inhalation, and sediment via ingestion and dermal contact. The potential risks to the

current trespasser are presented in Tables 5.28-Rev and 5.39, and are summarized below.




2011 HHRA 0.2 2.6E-06



The 2016 toxicity values decreased the total HI from 0.2 to 0.02 and the total cancer risk to 2.3E-

06. The total HI is less than the target value of 1 and the cumulative cancer risk is on the low end

of the EPA target risk range of 10-6 to 10-4. The COPCs in soil and sediment do not pose an

unacceptable threat to the current trespasser.

2.7 FUTURE TRESPASSER

The future trespasser was evaluated for exposure to COPCs in future surface soil via ingestion,

dermal contact, and inhalation, and sediment via ingestion and dermal contact. The potential risks

to the future trespasser are presented in Tables 5.29-Rev and 5.40, and are summarized below.


2011 HHRA 0.2 8.9E-06



With the current toxicity values, the total HI is less than 1 and the total cancer risk is in the middle

of the EPA target risk range. The COPCs in soil and sediment do not pose an unacceptable threat

to the future trespasser.

2.8 CURRENT OFF-SITE RESIDENT (CHILD AND AGE-ADJUSTED)

The current off-site resident was evaluated for exposure to COPCs in groundwater. The potential

risks to the current off-site resident are presented in Tables 5.30-Rev, 5.31-Rev, 5.41, and 5.42,

and summarized below.


2011 HHRA 2 1.7E-03



With the changes in toxicity values, the total HI increased from 2 to 4. The increase was primarily

associated with updated RfD and RfC values for PCE. The site-related HI is greater than 1. On a

target organ basis, the neurological HI exceeds 1 due to PCE.

The updated toxicity values decreased the total cancer risk from 1.7E-03 to 1.0E-04. The majority

of this risk was due to arsenic and chromium. Arsenic and chromium in off-site groundwater were

determined to be present at concentrations consistent with background. The site-related cancer risk

of 1.8E-05 is in the middle of the EPA target risk range.



Based on the revised risk calculations, site-related COPCs in off-site groundwater pose a non-

cancer hazard to the current resident who uses the groundwater as a potable water source. An

unacceptable cancer risk was not identified.

2.9 FUTURE ON-SITE RESIDENT (CHILD AND AGE-ADJUSTED)

The future resident was evaluated for exposure to COPCs in future surface soil, soil gas, and near

source groundwater. The potential risks to the future on-site resident are presented in Tables 5.32-

Rev, 5.33-Rev, 5.43, and 5.44, and summarized below.


2011 HHRA 170 5.9E-02



The 2016 toxicity values decreased the total HI and total cancer risk, but the results still indicate a

potential threat to human health. The site-related COPCs result in HIs greater than 1 for kidneys

(1,4-dioxane in soil gas), liver (1,4-dioxane in soil gas), neurological system (PCE in soil gas,

aluminum in groundwater, and PCE in groundwater), hair (vanadium in groundwater), and nasal

effects (1,1,2-trichloroethane in groundwater).

Both total and site-related cancer risks exceed 1E-04. The primary contributors to the site-related

cancer risk are chromium in soil, 1,4-dioxane in soil gas, chromium in groundwater, 1,2-

dibromoethane in groundwater, PCE in groundwater, and 1,1,2-trichloroethane in groundwater.

3.0 SUMMARY AND CONCLUSIONS

As requested by the EPA, this HHRA Addendum updated the 2011 risk calculations to reflect

current toxicity values and to incorporate background attribution into the risk characterization. The

2016 HHRA Addendum risk values, both total and site-related, and the 2011 HHRA risk values

are summarized in Table 1. Additional components of the 2011 HHRA, such as identification of

COPCs and calculation of exposure point concentrations, were not reviewed or revised as part of

this HHRA Addendum.

As shown in Table 1, the estimates of non-cancer and cancer risks changed for most of the receptors

as a result of the toxicity value update. However, most of the changes were of minimal magnitude

and the conclusions for most of the receptors were not affected. The toxicity value updates did

affect the conclusions for four site receptors. Each of these receptors is summarized below.

The non-cancer HI for both the current and future indoor industrial worker increased from less

than 1 (0.2) to greater than 1 (2). This change was a result of updated RfC values for 1,4-dioxane,

PCE, and TCE. Because the HI exceeded 1, the HHRA Addendum quantified the HI on a target

organ basis. The target organ HI for the liver and kidney exceed 1 (each were estimated to be 1.3

and are due entirely to 1,4-dioxane), indicating potential non-cancer hazards exist for the current

and future indoor industrial worker receptor. Cancer risks for both the current and future indoor

industrial worker decreased from exceeding the EPA target risk range (4E-04) to within the EPA



target risk range (8E-05). This change was a result of the updated attenuation factor used in the

vapor intrusion calculations. In summary, carcinogenic risks for these receptors exceeded target

levels in the 2011 HHRA. The 2016 HHRA Addendum concludes that, while the cancer risk values

are within target levels, non-cancer hazards exceeding target levels exist for both the current and

future indoor industrial worker receptors.

The 2011 HHRA identified potential non-cancer effects for the future construction worker. These

effects, however, were associated with background constituents. When only site-related COPCs

are considered, there is no unacceptable threat to the future construction worker.

The 2011 HHRA identified unacceptable cancer risks for the offsite resident exposed to

groundwater. The primary contributors to this risk were the background constituents arsenic and

chromium. When only the site-related COPCs are considered, the cancer risk decreases to 1.8E-

05, which is within the target risk range of 1E-06 to 1E-04. Based on the HHRA Addendum, off-

site groundwater poses only a non-cancer threat to human health.



TABLES

Table 1 Summary of 2011 and 2016 Non-Cancer Hazards and Cancer Risks

Table 4.1-Rev Non-Cancer Toxicity Data – Oral/Dermal

Table 4.2-Rev Non-Cancer Toxicity Data – Inhalation

Table 4.3-Rev Cancer Toxicity Data – Oral/Dermal

Table 4.4-Rev Cancer Toxicity Data – Inhalation

Table 5.1-Rev Calculation of Non-Cancer Hazards, Current Indoor Industrial Worker,

Surface Soil

Table 5.2-Rev Calculation of Cancer Risks, Current Indoor Industrial Worker, Surface

Soil

Table 5.3-Rev Calculation of Non-Cancer Hazards, Current Outdoor Industrial Worker,

Surface Soil

Table 5.4-Rev Calculation of Cancer Risks, Current Outdoor Industrial Worker, Surface

Soil

Table 5.5-Rev Calculation of Non-Cancer Hazards, Future Indoor Industrial Worker,

Surface Soil

Table 5.6-Rev Calculation of Cancer Risks, Future Indoor Industrial Worker, Surface Soil

Table 5.7-Rev Calculation of Non-Cancer Hazards, Future Outdoor Industrial Worker,

Surface Soil

Table 5.8-Rev Calculation of Cancer Risks, Future Outdoor Industrial Worker, Surface

Soil

Table 5.9-Rev Calculation of Non-Cancer Hazards, Future Construction Worker, Site Soil

Table 5.10-Rev Calculation of Cancer Risks, Future Construction Worker, Site Soil

Table 5.11-Rev Calculation of Non-Cancer Hazards, Current Trespasser, Surface Soil

Table 5.12-Rev Calculation of Cancer Risks, Current Trespasser, Surface Soil

Table 5.13-Rev Calculation of Non-Cancer Hazards, Future Trespasser, Surface Soil

Table 5.14-Rev Calculation of Cancer Risks, Future Trespasser, Surface Soil

Table 5.15-Rev Calculation of Non-Cancer Hazards, Current Trespasser, Sediment

Table 5.16-Rev Calculation of Cancer Risks, Current Adolescent Trespasser, Sediment

Table 5.17-Rev Calculation of Non-Cancer Hazards, Future On-Site Resident, Surface Soil

Table 5.18-Rev Calculation of Cancer Risks, Future On-Site Resident, Surface Soil

Table 5.19-Rev Calculation of Non-Cancer Hazards, Current Off-Site Resident,

Groundwater

Table 5.20-Rev Calculation of Cancer Risks, Current Off-Site Resident, Groundwater

Table 5.21-Rev Calculation of Non-Cancer Hazards, Future On-Site Resident, Groundwater

Table 5.22-Rev Calculation of Cancer Risks, Future On-Site Resident, Groundwater

Table 5.23-Rev Summary of Receptor Risks and Hazards for COPCs, Current Indoor

Industrial Worker

Table 5.24-Rev Summary of Receptor Risks and Hazards for COPCs, Current Outdoor

Industrial Worker

Table 5.25-Rev Summary of Receptor Risks and Hazards for COPCs, Future Indoor

Industrial Worker



Table 5.26-Rev Summary of Receptor Risks and Hazards for COPCs, Future Outdoor

Industrial Worker

Table 5.27-Rev Summary of Receptor Risks and Hazards for COPCs, Future Construction

Worker

Table 5.28-Rev Summary of Receptor Risks and Hazards for COPCs, Current Trespasser

Table 5.29-Rev Summary of Receptor Risks and Hazards for COPCs, Future Trespasser

Table 5.30-Rev Summary of Receptor Hazards for COPCs, Current Off-Site Resident

Table 5.31-Rev Summary of Receptor Risks for COPCs, Current Off-Site Resident

Table 5.32-Rev Summary of Receptor Hazards for COPCs, Future On-Site Resident

Table 5.33-Rev Summary of Receptor Risks for COPCs, Future On-Site Resident

Table 5.34 Summary of Receptor Risks and Hazards for Site-Related COPCs, Current

Indoor Industrial Worker


Outdoor Industrial Worker

Table 5.36 Summary of Receptor Risks and Hazards for Site-Related COPCs, Future

Indoor Industrial Worker


Outdoor Industrial Worker


Construction Worker


Trespasser


Trespasser

Table 5.41 Summary of Receptor Hazards for Site-Related COPCs, Current Off-Site

Resident

Table 5.42 Summary of Receptor Risks for Site-Related COPCs, Current Off-Site

Resident

Table 5.43 Summary of Receptor Hazards for Site-Related COPCs, On-Site Resident

Table 5.44 Summary of Receptor Risks for Site-Related COPCs, On-Site Resident

REFERENCES

U.S. Environmental Protection Agency (EPA), 1991. Role of the Baseline Risk Assessment in

Superfund Remedy Selection Decisions. OSWER Directive 9355.0-30. April.

EPA, 2003. Human Health Toxicity Values in Superfund Risk Assessments, OSWER 9285.7-53,

December.

EPA, 2015. OSWER Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway

from Subsurface Vapor Sources to Indoor Air. OSWER Publication 9200.2-154. June.

HGL, 2011a. Revised Final Remedial Investigation Report, West Highway 6 & Highway 281 Site,

Hastings, NE. March.



HGL, 2011b. Revised Final Background Metals Study Addendum, West Highway 6 & Highway

281 Site, Hastings, NE. November.

TABLES

Table 1

Summary of 2011 and 2016 Non-Cancer Hazards and Cancer Risks

West Highway 6 Highway 281 Site, Hastings, Nebraska

Non-Cancer HI Cancer Risk Non-Cancer HI Cancer Risk Non-Cancer HI Cancer Risk

Current Indoor Industrial Worker 0.2 4.6E-04 2 7.5E-05 2 7.4E-05

Future Indoor Industrial Worker 0.3 4.7E-04 2 8.3E-05 2 8.2E-05

Current Outdoor Industrial Worker 0.02 4.9E-06 0.02 4.0E-06 0.004 2.2E-06

Future Outdoor Industrial Worker 0.05 2.2E-05 0.05 2.1E-05 0.03 1.9E-05

Current Adolescent Trespasser 0.2 2.6E-06 0.02 2.3E-06 0.01 2.0E-06

Future Adolescent Trespasser 0.2 8.9E-06 0.03 8.5E-06 0.02 8.1E-06

Future Construction Worker 5 1.7E-05 5 1.6E-05 0.7 1.6E-05

Current Off-Site Resident 2 1.7E-03 4 1.0E-04 3 1.8E-05

Future On-Site Resident 170 5.9E-02 152 1.8E-03 143 1.7E-03

HHRA = human health risk assessment

HI = hazard index

2011 HHRA HHRA Addendum - Total Risk HHRA Addendum - Site-Related RiskReceptor

Page 1 of 1 May 2016

Chemical Chronic/ Oral RfD Oral RfD Oral to Dermal Adjusted Primary Combined

of Potential Subchronic Value Units Adjustment Factor (1) Dermal Target Uncertainty/Modifying Sources of RfD Dates of RfD

Concern RfD (2) Organ Factors (3)

Aluminum Chronic 1.0E+00 mg/kg-day 1 1.0E+00 mg/kg-day Neurological 100 PPRTV 04/2016

Arsenic Chronic 3.0E-04 mg/kg-day 1 3.0E-04 mg/kg-day Skin/Vascular 3 / 1 IRIS 04/2016

Chromium Chronic 3.0E-03 mg/kg-day 0.025 7.5E-05 mg/kg-day None Reported 300 / 3 IRIS 04/2016

Cobalt Chronic 3.0E-04 mg/kg-day 1 3.0E-04 mg/kg-day Thyroid 3000 PPRTV 04/2016

Iron Chronic 7.0E-01 mg/kg-day 1 7.0E-01 mg/kg-day Gastrointestinal Tract N/A PPRTV 04/2016

Manganese Chronic 2.4E-02 mg/kg-day 0.04 9.6E-04 mg/kg-day CNS 1000/1 IRIS 04/2016

Vanadium Chronic 5.0E-03 mg/kg-day 0.026 1.3E-04 mg/kg-day Hair 100 RSL/IRIS 04/2016

Benzene Chronic 4.0E-03 mg/kg-day 1 4.0E-03 mg/kg-day Blood 300/1 IRIS 04/2016

Carbon Tetrachloride Chronic 4.0E-03 mg/kg-day 1 4.0E-03 mg/kg-day Liver 1000/1 IRIS 04/2016

Chloroform Chronic 1.0E-02 mg/kg-day 1 1.0E-02 mg/kg-day Liver 100/1 IRIS 04/2016

1,2-Dibromoethane Chronic 9.0E-03 mg/kg-day 1 9.0E-03 mg/kg-day Liver, Reproductive, Endocrine 3000/1 IRIS 04/2016

1,1-Dichloroethane Chronic 2.0E-01 mg/kg-day 1 2.0E-01 mg/kg-day Kidney 3000 PPRTV 04/2016

1,3-Dichloropropene Chronic 3.0E-02 mg/kg-day 1 3.0E-02 mg/kg-day Stomach 100/1 IRIS 04/2016

Ethylbenzene Chronic 1.0E-01 mg/kg-day 1 1.0E-01 mg/kg-day Liver and Kidney 1000/1 IRIS 04/2016

Naphthalene Chronic 2.0E-02 mg/kg-day 1 2.0E-02 mg/kg-day Body Weight 3000/1 IRIS 04/2016

1,1,2,2-Tetrachloroethane Chronic 2.0E-02 mg/kg-day 1 2.0E-02 mg/kg-day Liver N/A IRIS 04/2016

Tetrachloroethene Chronic 6.0E-03 mg/kg-day 1 6.0E-03 mg/kg-day Neurological 1000 / 1 IRIS 04/2016

1,1,2-Trichloroethane Chronic 4.0E-03 mg/kg-day 1 4.0E-03 mg/kg-day Blood, Immune system 1000/1 IRIS 04/2016

IRIS = EPA Integrated Risk Information System

N/A = Not Applicable

ATSDR = Agency for Toxic Substances and Disease Registry

HEAST = Health Effects Assessment Summary Tables

PPRTV = Provisional Peer-Reviewed Toxicity Values Database

Hexavalent chromium toxicity values were used for chromium

(1) EPA 2004. RAGS Volume 1: Human Health Evaluation Manual (Part E, Supplemental Guidance for Dermal Risk Assessment).

(2) Oral RfD*Oral to Dermal Adjustment Factor = Adjusted Dermal RfD

(3) For IRIS values, date that IRIS was searched. For PPRTV and ATSDR values, date of the EPA RSL table.

TABLE 4.1-Rev

NON-CANCER TOXICITY DATA -- ORAL/DERMAL

West Highway 6 & Highway 281 Site, Hastings, Nebraska

Units

6/21/2016

Chemical Chronic/ RfC RfC Primary Combined

of Potential Subchronic Value Units Target Uncertainty/Modifying Sources of RfC Dates of RfC (1)

Concern Organ Factors

Aluminum Chronic 5.0E-03 mg/m3

Neurological N/A PPRTV 04/2016

Arsenic Chronic 1.5E-05 mg/m3

Development, Vascular

system, Nervous system N/A CalEPA 04/2016

Cadmium Chronic 1.0E-05 mg/m3 Kidneys N/A ATSDR 04/2016

Chromium Chronic 1.0E-04 mg/m3

Lungs 300/1 IRIS 04/2016

Cobalt Chronic 6.0E-06 mg/m3 Respiratory N/A PPRTV 04/2016

Iron N/A N/A N/A N/A 300/1 N/A N/A

Manganese Chronic 5.0E-05 mg/m3

Central Nervous System 1000/1 IRIS 04/2016

Nickel Chronic 1.4E-05 mg/m3 Respiratory, Blood, Liver N/A CalEPA

04/2016

Vanadium Chronic 1.0E-04 mg/m3

Respiratory N/A ATSDR 04/2016

Benzene Chronic 3.0E-02 mg/m3

Blood 300 / 1 IRIS 04/2016

Carbon Tetrachloride Chronic 1.0E-01 mg/m3 Liver N/A IRIS 04/2016

Chloroform Chronic 9.8E-02 mg/m3

Liver N/A ATSDR 04/2016

1,2-Dibromoethane Chronic 9.0E-03 mg/m3 Nasal 300/1 IRIS 04/2016

1,1-Dichloroethane N/A N/A N/A N/A N/A N/A N/A

1,3-Dichloropropene Chronic 2.0E-02 mg/m3 Nasal 30/1 IRIS 04/2016

1,4-Dioxane Chronic 3.0E-02 mg/m3 Liver and Kidney N/A IRIS 04/2016

Ethylbenzene Chronic 1.0E+00 mg/m3

Development 300 / 1 IRIS 04/2016

Naphthalene Chronic 3.0E-03 mg/m3 Nasal 3000/1 IRIS 04/2016

1,1,2,2-Tetrachloroethane N/A N/A N/A N/A N/A N/A N/A

Tetrachloroethene Chronic 4.0E-02 mg/m3

Neurological N/A IRIS 04/2016

1,1,2-Trichloroethane Chronic 2.00E-04 mg/m3

Nasal 300 PPRTV 04/2016

Trichloroethene Chronic 2.00E-03 mg/m3 Development, Heart,

Immune System1000/1 IRIS 04/2016

ATSDR = Agency for Toxic Substances and Disease Registry

CalEPA = California EPA

IRIS = EPA Integrated Risk Information System

N/A = Not Applicable

PPRTV = Provisional Peer-Reviewed Toxicity Values Database

Hexavalent chromium toxicity values were used for chromium

(1) For IRIS values, date that IRIS was searched. For other values, date of the EPA RSL table.

TABLE 4.2-Rev

NON-CANCER TOXICITY DATA -- INHALATION


6/21/2016

TABLE 4.3-Rev

CANCER TOXICITY DATA -- ORAL/DERMAL


Chemical Oral to Dermal Adjusted Dermal Units Weight of Evidence/ Source Date

of Potential Oral Cancer Slope Factor Adjustment Cancer Slope Factor (2) Cancer Guideline (MM/DD/YY)

Concern Factor (1) Description (3)

Aluminum N/A N/A N/A N/A N/A N/A N/A

Arsenic 1.5E+00 1 1.5E+00 (mg/kg-day)-1

A IRIS 04/2016

Chromium 5.0E-01 0.025 2.0E+01 (mg/kg-day)-1

A NJDEP 04/2016

Cobalt N/A N/A N/A N/A N/A N/A N/A

Iron N/A N/A N/A N/A N/A N/A N/A

Manganese N/A N/A N/A N/A N/A N/A N/A

Vanadium N/A N/A N/A N/A N/A N/A N/A

Benzene 5.5E-02 1 5.5E-02 (mg/kg-day)-1

A IRIS 04/2016

Carbon Tetrachloride 7.0E-02 1 7.0E-02 (mg/kg-day)-1

B2 IRIS 04/2016

Chloroform 3.1E-02 1 3.1E-02 (mg/kg-day)-1

B2 CalEPA 04/2016

1,2-Dibromoethane 2.0E+00 1 2.0E+00 (mg/kg-day)-1

B2 IRIS 04/2016

1,1-Dichloroethane 5.7E-03 1 5.7E-03 (mg/kg-day)-1

N/A CalEPA 04/2016

1,3-Dichloropropene 1.0E-01 1 1.0E-01 (mg/kg-day)-1

B2 IRIS 04/2016

Ethylbenzene 1.1E-02 1 1.1E-02 (mg/kg-day)-1

N/A CalEPA 04/2016

Naphthalene N/A N/A N/A N/A N/A N/A N/A

1,1,2,2-Tetrachloroethane 2.0E-01 1 2.0E-01 (mg/kg-day)-1

B2 IRIS 04/2016

Tetrachloroethene 2.1E-03 1 2.1E-03 (mg/kg-day)-1

LI IRIS 04/2016

1,1,2-Trichloroethane 5.7E-02 1 5.7E-02 (mg/kg-day)-1

C IRIS 04/2016

CalEPA = California EPA Weight of Evidence:

IRIS = Integrated Risk Information System A - Human carcinogen

N/A= No toxicity value available B2 - Probable human carcinogen - indicates sufficient evidence

NJDEP = New Jersey Department of Environmental Protection in animals and inadequate or no evidence in humans

Hexavalent chromium toxicity values were used for chromium C - Possible human carcinogen

(1) EPA 2004. RAGS Volume 1: Human Health Evaluation Manual (Part E, Supplemental Guidance for Dermal Risk Assessment). LI - likely to be carcinogenic to humans

(2) Oral CSF/ Oral to Dermal Adjustment Factor = Adjusted Dermal CSF

Hwy6_RAGS_Tables_4.1-Rev - 4.4-Rev.xls Page 1 of 1

TABLE 4.4-Rev

CANCER TOXICITY DATA -- INHALATION

Chemical Inhalation Units Weight of Evidence/ Source Date

of Potential Unit Risk Cancer Guideline (MM/DD/YY)

Concern Description (1)

Aluminum N/A N/A N/A N/A N/A

Arsenic 4.3E-03 (ug/m3)-1

A IRIS 04/2016

Cadmium 1.8E-03 (ug/m3)-1

B1 IRIS 05/2010

Chromium 8.4E-02 (ug/m3)-1

A IRIS 04/2016

Cobalt 9.0E-03 (ug/m3)-1

LI PPRTV 04/2016

Iron N/A N/A N/A N/A N/A

Manganese N/A N/A D IRIS 04/2016

Nickel 2.4E-04 (ug/m3)-1

A IRIS 04/2016

Vanadium N/A N/A N/A N/A N/A

Benzene 7.8E-06 (ug/m3)-1

A IRIS 04/2016

Carbon Tetrachloride 6.0E-06 (ug/m3)-1

B2 IRIS 04/2016

Chloroform 2.3E-05 (ug/m3)-1

B2 IRIS 04/2016

1,2-Dibromoethane 6.0E-04 (ug/m3)-1

B2 IRIS 04/2016

1,1-Dichloroethane 1.6E-06 (ug/m3)-1

N/A CalEPA 04/2016

1,3-Dichloropropene 4.0E-06 (ug/m3)-1

B2 IRIS 04/2016

1,4-Dioxane 5.0E-06 (ug/m3)-1

LI IRIS 04/2016

Ethylbenzene 2.5E-06 (ug/m3)-1

N/A CalEPA 04/2016

Naphthalene 3.4E-05 (ug/m3)-1

N/A CalEPA 04/2016

1,1,2,2-Tetrachloroethane 5.8E-05 (ug/m3)-1

B2 CalEPA 04/2016

Tetrachloroethene 2.6E-07 (ug/m3)-1

LI IRIS 04/2016

1,1,2-Trichloroethane 1.6E-05 (ug/m3)-1

C IRIS 04/2016

Trichloroethene 4.1E-06 (ug/m3)-1

Carcinogenic to humans IRIS 04/2016

CalEPA = California EPA Weight of Evidence:

IRIS = Integrated Risk Information System A - Human carcinogen

N/A= Not Available B1 - Probable human carcinogen - limited evidence of carcinogenicity

PPRTV = Provisional Peer-Reviewed Toxicity Values Database in humans inadequate or no evidence in humans

Hexavalent chromium toxicity values were used for chromium B2 - Probable human carcinogen - sufficient evidence in animals and

(1) For IRIS values, date that IRIS was searched. For other values, date of the EPA RSL table. inadequate or no evidence in humans

ug/m3 = micrograms per cubic meter C - Possible human carcinogen

D - Not classifiable as to human carcinogenicity

LI - likely to be carcinogenic to humans


Hwy6_RAGS_Tables_4.1-Rev - 4.4-Rev.xls Page 1 of 1

TABLE 5.1-Rev

CALCULATION OF NON-CANCER HAZARDS

REASONABLE MAXIMUM EXPOSURE


Scenario Timeframe: Current

Medium: Surface Soil and Soil Gas (Vapor Intrusion)

Exposure Medium: Surface Soil and Soil Gas (Vapor Intrusion)

Exposure Point: Surface Soil at W. Hwy. 6 & Hwy. 281 Site

Receptor Population: Indoor Industrial Worker

Receptor Age: Adult

Value Units Value Units Value Units

Ingestion Arsenic 4.8E+00 mg/kg 1.4E-06 mg/kg-day 3.0E-04 mg/kg-day 0.005

Chromium 1.4E+01 mg/kg 6.7E-06 mg/kg-day 3.0E-03 mg/kg-day 0.002

0.01

Inhalation Arsenic 3.5E-06 ug/m3 8.1E-07 ug/m3 1.5E-05 mg/m3 0.00005

Chromium 1.0E-05 ug/m32.3E-06 ug/m3

1.0E-04 mg/m30.00002

0.00008

Benzene 9.1E-01 ug/m3 2.1E-01 ug/m3 3.0E-02 mg/m3 0.007

1,4-Dioxane 1.7E+02 ug/m3 4.0E+01 ug/m3 3.0E-02 mg/m3 1.3

Ethylbenzene 8.1E-01 ug/m3 1.9E-01 ug/m3 1.0E+00 mg/m3 0.0002

Tetrachloroethene 5.8E+01 ug/m3 1.3E+01 ug/m3 4.0E-02 mg/m3 0.3

Trichloroethene 3.8E-01 ug/m38.6E-02 ug/m3

2.0E-03 mg/m30.04

2

2

Exposure Route Total

Vapor Intrusion



Total of Receptor Hazards Across All Media

Reference Dose / Reference Concentration

HazardQuotient

ExposureRoute

Chemicalof Potential

Concern

Exposure Point Concentration Intake (Non-Cancer)

Page 1 of 1

TABLE 5.2-RevCALCULATION OF CANCER RISKS

REASONABLE MAXIMUM EXPOSUREWest Highway 6 & Highway 281 Site, Hastings, Nebraska






Receptor Age: Adult

Value Units Value Units

Ingestion Arsenic 4.8E+00 mg/kg 5.0E-07 mg/kg-day 1.5E+00 (mg/kg-day)-1 7.5E-07

Chromium 1.4E+01 mg/kg 2.4E-06 mg/kg-day 5.0E-01 (mg/kg-day)-1 1.2E-06

2.0E-06

Inhalation Arsenic 3.5E-06 ug/m3 2.9E-07 ug/m3 4.3E-03 ug/m3 1.2E-09


8.4E-02 ug/m3 6.9E-08

7.0E-08

Benzene 9.1E-01 ug/m3 7.4E-02 ug/m3 7.8E-06 (ug/m3)-1 5.8E-07

1,4-Dioxane 1.7E+02 ug/m3 1.4E+01 ug/m3 5.0E-06 (ug/m3)-1 7.1E-05

Ethylbenzene 8.1E-01 ug/m3 6.6E-02 ug/m3 2.5E-06 (ug/m3)-1 1.7E-07

Tetrachloroethene 5.8E+01 ug/m3 4.7E+00 ug/m3 2.6E-07 (ug/m3)-1 1.2E-06


4.1E-06 (ug/m3)-1 1.3E-07

7.3E-05

7.5E-05

Cancer RiskUnitsValue


Concern

Exposure Point Concentration Cancer Risk Calculations


Intake (Cancer)

ExposureRoute

Cancer Slope Factor / Inhalation Unit Risk



Vapor IntrusionExposure Route Total

Page 1 of 1

TABLE 5.3-Rev





Medium: Surface Soil

Exposure Medium: Surface Soil


Receptor Population: Outdoor Industrial Worker

Receptor Age: Adult




0.01

Dermal Ab i

Arsenic 4.80E+00 mg/kg 8.4E-07 mg/kg-day 3.0E-04 mg/kg-day 0.003

0.003



1.0E-04 mg/m30.00002

0.00007

Total of Receptor Hazards Across All Media 0.02




HazardQuotient


ExposureRoute


Concern


Page 1 of 1



Scenario Timeframe: CurrentMedium: Surface SoilExposure Medium: Surface SoilExposure Point: Surface Soil at W. Hwy. 6 & Hwy. 281 SiteReceptor Population: Outdoor Industrial WorkerReceptor Age: Adult



Chromium 1.37E+01 mg/kg 4.3E-06 mg/kg-day 5.0E-01 (mg/kg-day)-12.2E-06

3.5E-06

Dermal Ab i

Arsenic 4.80E+00 mg/kg 3.0E-07 mg/kg-day 1.5E+00 (mg/kg-day)-14.5E-07

4.5E-07

Inhalation Arsenic 3.5E-06 ug/m3 2.6E-07 ug/m3 4.3E-03 (ug/m3)-1 1.1E-09


8.4E-02 (ug/m3)-1

6.2E-08

6.3E-08

4.0E-06Total of Receptor Hazards Across All Media

Intake (Cancer)Exposure

RouteCancer Slope Factor / Inhalation Unit Risk






Concern


Page 1 of 1

TABLE 5.5-Rev




Scenario Timeframe: Future





Receptor Age: Adult




0.02



1.0E-04 mg/m30.0002

0.0003


1,4-Dioxane 1.7E+02 ug/m3 4.0E+01 ug/m3 3.0E-02 mg/m3 1.3




2.0E-03 mg/m30.04

2

2


Vapor Intrusion





HazardQuotient

ExposureRoute


Concern


Page 1 of 1








Receptor Age: Adult



Chromium 1.1E+02 mg/kg 1.8E-05 mg/kg-day 5.0E-01 (mg/kg-day)-1 9.0E-06

9.8E-06

Inhalation Arsenic 4.2E-06 ug/m3 3.4E-07 ug/m3 4.3E-03 ug/m3 1.5E-09


8.4E-02 ug/m3 5.8E-07

5.8E-07

Benzene 9.1E-01 ug/m3 7.4E-02 ug/m3 7.8E-06 (ug/m3)-1 5.8E-07

1,4-Dioxane 1.7E+02 ug/m3 1.4E+01 ug/m3 5.0E-06 (ug/m3)-1 7.1E-05

Ethylbenzene 8.1E-01 ug/m3 6.6E-02 ug/m3 2.5E-06 (ug/m3)-1 1.7E-07

Tetrachloroethene 5.8E+01 ug/m3 4.7E+00 ug/m3 2.6E-07 (ug/m3)-1 1.2E-06


4.1E-06 (ug/m3)-1 1.3E-07

7.3E-05





.

Vapor Intrusion




Concern


Page 1 of 1

TABLE 5.7-Rev








Receptor Population: Outdoor Industrial Worker

Receptor Age: Adult




0.04

Dermal Ab i


0.003



1.0E-04 mg/m30.0002

0.0002

0.05





HazardQuotient


ExposureRoute


Concern


Page 1 of 1



Scenario Timeframe: FutureMedium: Surface SoilExposure Medium: Surface SoilExposure Point: Surface Soil at W. Hwy. 6 & Hwy. 281 SiteReceptor Population: Outdoor Industrial WorkerReceptor Age: Adult




2.0E-05


5.3E-07

Inhalation Arsenic 4.2E-06 ug/m3 3.1E-07 ug/m3 4.3E-03 (ug/m3)-1 1.3E-09


8.4E-02 (ug/m3)-1

5.2E-07

5.2E-07

2.1E-05



Concern








Dermal Ab i

Page 1 of 1

TABLE 5.9-Rev





Medium: Surface and Subsurface Soil

Exposure Medium: Surface and Subsurface Soil

Exposure Point: Surface and Subsurface Soil at W. Hwy. 6 & Hwy. 281 Site

Receptor Population: Construction Worker

Receptor Age: Adult




0.06

Dermal Ab i


0.005

Aluminum 2.7E+01 ug/m3 5.5E+00 ug/m3 5.0E-03 mg/m3 1.1

Arsenic 1.1E-02 ug/m3 2.4E-03 ug/m3 1.5E-05 mg/m3 0.2

Cadmium 5.2E-03 ug/m3 1.1E-03 ug/m3 1.0E-05 mg/m3 0.1

Chromium 6.1E-02 ug/m3 1.3E-02 ug/m3 1.0E-04 mg/m3 0.1

Cobalt 1.4E-02 ug/m3 3.0E-03 ug/m3 6.0E-06 mg/m3 0.5

Manganese 7.1E-01 ug/m3 1.5E-01 ug/m3 5.0E-05 mg/m3 3

Nickel 3.2E-02 ug/m36.7E-03 ug/m3

1.4E-05 mg/m30.5

5

5

HazardQuotient


ExposureRoute


Concern


Inhalation





Page 1 of 1



Scenario Timeframe: FutureMedium: Surface and Subsurface SoilExposure Medium: Surface and Subsurface SoilExposure Point: Surface and Subsurface Soil at W. Hwy. 6 & Hwy. 281 SiteReceptor Population: Construction WorkerReceptor Age: Adult




8.4E-07


3.2E-08

Aluminum 2.7E+01 ug/m3 7.8E-02 ug/m3 NA (ug/m3)-1 NA

Arsenic 1.1E-02 ug/m3 3.4E-05 ug/m3 4.3E-03 (ug/m3)-1 1.5E-07

Cadmium 5.2E-03 ug/m3 1.5E-05 ug/m3 1.8E-03 (ug/m3)-1 2.7E-08

Chromium 6.1E-02 ug/m3 1.8E-04 ug/m3 8.4E-02 (ug/m3)-1 1.5E-05

Cobalt 1.4E-02 ug/m3 4.2E-05 ug/m3 9.0E-03 (ug/m3)-1 3.8E-07

Manganese 7.1E-01 ug/m3 2.1E-03 ug/m3 NA (ug/m3)-1 NA

Nickel 3.2E-02 ug/m39.5E-05 ug/m3

2.4E-04 (ug/m3)-1

2.3E-08

1.6E-05



Concern


Exposure Point Concentration


Dermal Ab i

Cancer Risk Calculations


Inhalation


RouteCancer Slope Factor / Inhalation Unit Risk Cancer RiskUnitsValue

Page 1 of 1

TABLE 5.11-Rev








Receptor Population: Trespasser

Receptor Age: Adolescent




Vanadium 2.2E+01 mg/kg 6.5E-06 mg/kg-day 5.0E-03 mg/kg-day 0.001

0.006

Dermal Ab i


0.002



Vanadium 1.6E-05 ug/m37.5E-07 ug/m3

1.0E-04 mg/m30.000008

0.00002

0.008

Intake (Non-Cancer)

Inhalation





HazardQuotient


ExposureRoute


Concern


Page 1 of 1

TABLE 5.12-Rev

CALCULATION OF CANCER RISKS











Chromium 8.2E-07

Age 8 - 16 years 1.4E+01 mg/kg 5.3E-07 mg/kg-day 5.0E-01 (mg/kg-day)-1 3 8.0E-07


Vanadium 2.2E+01 mg/kg 9.3E-07 mg/kg-day NA (mg/kg-day)-1NA

1.0E-06Dermal

Ab iArsenic 4.8E+00 mg/kg 1.1E-07 mg/kg-day 1.5E+00 (mg/kg-day)-1

1.6E-07

1.6E-07


Chromium 1.6E-08

Age 8 - 16 years 1.0E-05 ug/m3 6.1E-08 ug/m3 8.4E-02 (ug/m3)-1 3 1.5E-08



NA (ug/m3)-1NA

1.6E-08

1.2E-06

UnitsValue

Inhalation


Age-Dependent Adjustment

Factors (unitless)

Age-Dependent Cancer Risk



Concern





Intake (Cancer)ExposureRoute


Cancer Risk

Page 1 of 1

TABLE 5.13-Rev














0.02


0.003




1.0E-04 mg/m30.000008

0.00006

0.02





Inhalation

HazardQuotient


Dermal Ab i

ExposureRoute


Concern


Page 1 of 1

TABLE 5.14-Rev












Chromium 6.8E-06




7.0E-06


1.9E-07


Chromium (ug/m3)-1 1.3E-07




NA (ug/m3)-1NA

1.3E-07

7.4E-06

Dermal Ab ti



Cancer Slope Factor / Inhalation Unit Risk Age-Dependent

Adjustment Factors (unitless)



Inhalation




Concern




Page 1 of 1

TABLE 5.15-Rev





Medium: Sediment

Exposure Medium: Sediment

Exposure Point: Sediment at W. Hwy. 6 & Hwy. 281 Site







0.007


0.004

0.01




HazardQuotient


Dermal Ab i

ExposureRoute


Concern


Page 1 of 1

TABLE 5.16-Rev





Medium: Sediment

Exposure Medium: Sediment

Exposure Point: Sediment at W. Hwy. 6 & Hwy. 281 Site





Chromium 6.8E-07




9.4E-07


2.3E-07

1.2E-06






Factors (unitless)





Concern


Exposure Route TotalDermal

Ab ti

Page 1 of 1

TABLE 5.17-Rev







Exposure Point: Soil at W. Hwy. 6 & Hwy. 281 Site

Receptor Population: On-Site Resident

Receptor Age: Child





0.7


0.02




1.0E-04 mg/m30.0002

0.001


1,4-Dioxane 1.7E+02 ug/m3 1.7E+02 ug/m3 3.0E-02 mg/m3 6




2.0E-03 mg/m30.2

7

8

The exposure point concentrations for the vapor intrusion pathway were revised as part of the HHRA Addendum to incorporate the revised default attenuation factor of 0.03.


HazardQuotient


ExposureRoute


Concern


Dermal Absorption

Inhalation




Vapor Intrusion


Page 1 of 1



Scenario Timeframe: FutureMedium: Surface Soil and Soil Gas (Vapor Intrusion)Exposure Medium: Surface Soil and Soil Gas (Vapor Intrusion)Exposure Point: Soil at W. Hwy. 6 & Hwy. 281 SiteReceptor Population: On-Site ResidentReceptor Age: Child/Adult


Ingestion Arsenic 5.7E+00 mg/kg 5.4E-06 mg/kg-day 1.5E+00 (mg/kg-day)-1 -- -- 8.0E-06

Chromium 3.8E-04

Age 0 -2 years 1.1E+02 mg/kg 4.2E-05 mg/kg-day 5.0E-01 (mg/kg-day)-1 10 2.1E-04




Vanadium 2.4E+01 mg/kg 3.7E-05 mg/kg-day N/A (mg/kg-day)-1-- -- N/A

3.9E-04

Arsenic5.7E+00 mg/kg 8.5E-07 mg/kg-day 1.5E+00 (mg/kg-day)-1

-- -- 1.3E-06

1.3E-06

Arsenic 4.2E-06 ug/m3 1.7E-06 ug/m3 4.3E-03 (ug/m3)-1 -- -- 7.4E-09

Chromium 7.4E-06

Age 0 -2 years 8.4E-05 ug/m3 2.3E-06 ug/m3 8.4E-02 (ug/m3)-1 10 1.9E-06




Vanadium 1.7E-05 ug/m37.2E-06 ug/m3 NA (ug/m3)-1

-- -- NA

7.4E-06

Benzene 9.1E-01 ug/m3 3.7E-01 ug/m3 7.8E-06 (ug/m3)-1 -- -- 2.9E-06

1,4-Dioxane 1.7E+02 ug/m3 7.1E+01 ug/m3 5.0E-06 (ug/m3)-1 -- -- 3.6E-04

Ethylbenzene 8.1E-01 ug/m3 3.3E-01 ug/m3 2.5E-06 (ug/m3)-1 -- -- 8.4E-07

Tetrachloroethene 5.8E+01 ug/m3 2.4E+01 ug/m3 2.6E-07 (ug/m3)-1 -- -- 6.2E-06Trichloroethene - nonmutagenic

component 3.8E-01 ug/m3 1.5E-01 ug/m3 3.1E-06 (ug/m3)-1 4.8E-07

Trichloroethene - mutagenic component 3.9E-07

Age 0 -2 years 3.8E-01 ug/m3 1.0E-02 ug/m3 1.0E-06 (ug/m3)-1 10 1.0E-07



Age 16 - 30 years 3.8E-01 ug/m37.2E-02 ug/m3 1.0E-06 (ug/m3)-1

1 7.2E-08

3.7E-04

7.7E-04

The exposure point concentrations for the vapor intrusion pathway were revised as part of the HHRA Addendum to incorporate the revised default attenuation factor of 0.03.



Concern




Dermal Absorption





Inhalation



Age-Dependent Adjustment Factors

(unitless)


Vapor Intrusion

Page 1 of 1


Medium: Groundwater

Exposure Medium: Groundwater

Exposure Point: Groundwater

Receptor Population: Off-Site Resident

Receptor Age: Child

Exposure Exposure Exposure Chemical of EPC Non-cancer Risk Calculations

Medium Medium Point RoutePotential Concern

Value Units Intake


Groundwater Water Tap Ingestion Arsenic 2.4E+00 ug/L 1.5E-04 mg/kg-day 3.0E-04 mg/kg-day 0.5

Chromium 8.7E-01 ug/L 5.5E-05 mg/kg-day 3.0E-03 mg/kg-day 0.02

Carbon Tetrachloride 1.6E+00 ug/L 1.0E-04 mg/kg-day 4.0E-03 mg/kg-day 0.03

Chloroform 1.0E+00 ug/L 6.4E-05 mg/kg-day 1.0E-02 mg/kg-day 0.006

Tetrachloroethene 1.2E+02 ug/L 7.7E-03 mg/kg-day 6.0E-03 mg/kg-day 1.3

Exp. Route Total 2

Groundwater Water Bath Dermal contact Arsenic 2.4E+00 ug/L 1.0E-06 mg/kg-day 3.0E-04 mg/kg-day 0.003

Chromium 8.7E-01 ug/L 7.3E-07 mg/kg-day 7.5E-05 mg/kg-day 0.010


Chloroform 1.0E+00 ug/L 5.6E-06 mg/kg-day 1.0E-02 mg/kg-day 0.0006

Tetrachloroethene 1.2E+02 ug/L 4.4E-03 mg/kg-day 6.0E-03 mg/kg-day 0.7

Exp. Route Total 0.8

Bath Inhalation Carbon Tetrachloride 1.6E+00 ug/L 5.8E-01 ug/m3 1.0E-01 mg/m3 0.006

Chloroform 1.0E+00 ug/L 3.6E-01 ug/m3 9.8E-02 mg/m3 0.004

Tetrachloroethene 1.2E+02 ug/L 4.3E+01 ug/m34.0E-02 mg/m3

1.1

Exp. Route Total 1.1

Exposure Medium Total 4

Hazard Quotient

TABLE 5.19-RevCALCULATION OF NON-CANCER HAZARDS



Page 1 of 1



Scenario Timeframe: CurrentMedium: GroundwaterExposure Medium: GroundwaterExposure Point: Groundwater at SiteReceptor Population: Off-Site ResidentReceptor Age: Child/Adult

Exposure Exposure Exposure Chemical of EPC Cancer Risk Calculations

Medium Medium Point Route

Potential Concern

Value Units IntakeCancer Risk


Groundwater Water Tap Ingestion Arsenic 2.4E+00 ug/L 3.5E-05 mg/kg-day 1.5E+00 (mg/kg-day)-1 -- -- 5.3E-05

Chromium 2.0E-05 Age 0 -2 years 8.7E-01 ug/L 1.6E-06 mg/kg-day 5.0E-01 (mg/kg-day)-1 10 7.9E-06 Age 2 - 6 years 8.7E-01 ug/L 3.2E-06 mg/kg-day 5.0E-01 (mg/kg-day)-1 3 4.8E-06 Age 6 - 16 years 8.7E-01 ug/L 3.4E-06 mg/kg-day 5.0E-01 (mg/kg-day)-1 3 5.1E-06 Age 16 - 30 years 8.7E-01 ug/L 4.8E-06 mg/kg-day 5.0E-01 (mg/kg-day)-1 1 2.4E-06Carbon Tetrachloride 1.6E+00 ug/L 2.4E-05 mg/kg-day 7.0E-02 (mg/kg-day)-1 -- -- 1.7E-06

Chloroform 1.0E+00 ug/L 1.5E-05 mg/kg-day 3.1E-02 (mg/kg-day)-1 -- -- 4.6E-07

Tetrachloroethene 1.2E+02 ug/L 1.8E-03 mg/kg-day 2.1E-03 (mg/kg-day)-1 -- -- 3.8E-06

Exp. Route Total 7.9E-05

Groundwater Water Shower Dermal contact Arsenic 2.4E+00 ug/L 2.0E-07 mg/kg-day 1.5E+00 (mg/kg-day)-1 -- -- 3.0E-07

Chromium 9.8E-06 Age 0 -2 years 8.7E-01 ug/L 2.1E-08 mg/kg-day 2.0E+01 (mg/kg-day) -1 10 4.2E-06 Age 2 - 6 years 8.7E-01 ug/L 4.2E-08 mg/kg-day 2.0E+01 (mg/kg-day) -1 3 2.5E-06 Age 6 - 16 years 8.7E-01 ug/L 3.5E-08 mg/kg-day 2.0E+01 (mg/kg-day) -1 3 2.1E-06 Age 16 - 30 years 8.7E-01 ug/L 5.0E-08 mg/kg-day 2.0E+01 (mg/kg-day) -1 1 9.9E-07Carbon Tetrachloride 1.6E+00 ug/L 6.3E-06 mg/kg-day 7.0E-02 (mg/kg-day) -1 -- -- 4.4E-07

Chloroform 1.0E+00 ug/L 1.3E-06 mg/kg-day 3.1E-02 (mg/kg-day) -1 -- -- 4.1E-08

Tetrachloroethene 1.2E+02 ug/L 1.0E-03 mg/kg-day 2.1E-03 (mg/kg-day)-1-- -- 2.2E-06


Groundwater Water Shower Inhalation Carbon Tetrachloride 1.6E+00 ug/L 2.5E-01 ug/m3 6.0E-06 (ug/m3)-1 -- -- 1.5E-06

Chloroform 1.0E+00 ug/L 1.5E-01 ug/m3 2.3E-05 (ug/m3)-1 -- -- 3.5E-06

Tetrachloroethene 1.2E+02 ug/L 1.8E+01 ug/m32.6E-07 (ug/m3)-1

-- -- 4.8E-06


Exposure Medium Total 1.0E-04

CSF/Unit Risk


Factors (unitless)Age-Dependent

Cancer Risk

Page 1 of 1


Medium: Groundwater


Exposure Point: Near Site Groundwater


Receptor Age: Child

Exposure Exposure Exposure Chemical of EPC Non-cancer Risk Calculations

Medium Medium Point RoutePotential Concern

Value Units Intake


Groundwater Water Tap Ingestion Aluminum 1.7E+04 ug/L 1.1E+00 mg/kg-day 1.0E+00 mg/kg-day 1.1

Arsenic 2.0E+00 ug/L 1.2E-04 mg/kg-day 3.0E-04 mg/kg-day 0.4

Chromium 1.1E+01 ug/L 7.2E-04 mg/kg-day 3.0E-03 mg/kg-day 0.2

Cobalt 2.5E+01 ug/L 1.6E-03 mg/kg-day 3.0E-04 mg/kg-day 5

Iron 1.6E+04 ug/L 1.0E+00 mg/kg-day 7.0E-01 mg/kg-day 1.4

Manganese 5.1E+02 ug/L 3.3E-02 mg/kg-day 2.4E-02 mg/kg-day 1.4

Vanadium 9.3E+01 ug/L 5.9E-03 mg/kg-day 5.0E-03 mg/kg-day 1.2

Benzene 6.4E-01 ug/L 4.1E-05 mg/kg-day 4.0E-03 mg/kg-day 0.01


Chloroform 6.4E-01 ug/L 4.1E-05 mg/kg-day 1.0E-02 mg/kg-day 0.004

1,2-Dibromoethane 9.4E-01 ug/L 6.0E-05 mg/kg-day 9.0E-03 mg/kg-day 0.007

1,1-Dichloroethane 6.6E-01 ug/L 4.2E-05 mg/kg-day 2.0E-01 mg/kg-day 0.0002

trans-1,3-Dichloropropene 1.1E+00 ug/L 7.0E-05 mg/kg-day 3.0E-02 mg/kg-day 0.002

Ethylbenzene 2.0E+00 ug/L 1.3E-04 mg/kg-day 1.0E-01 mg/kg-day 0.001

Naphthalene 7.3E-01 ug/L 4.7E-05 mg/kg-day 2.0E-02 mg/kg-day 0.002

1,1,2,2-Tetrachloroethane 9.3E-01 ug/L 5.9E-05 mg/kg-day 2.0E-02 mg/kg-day 0.003

Tetrachloroethene 4.1E+03 ug/L 2.6E-01 mg/kg-day 6.0E-03 mg/kg-day 43

1,1,2-Trichloroethane 1.5E+01 ug/L 9.6E-04 mg/kg-day 4.0E-03 mg/kg-day 0.2

Exp. Route Total 55

Groundwater Water Bath Dermal contact Aluminum 1.7E+04 ug/L 7.1E-03 mg/kg-day 1.0E+00 mg/kg-day 0.007

Arsenic 2.0E+00 ug/L 8.2E-07 mg/kg-day 3.0E-04 mg/kg-day 0.003

Chromium 1.1E+01 ug/L 9.5E-06 mg/kg-day 7.5E-05 mg/kg-day 0.1

Cobalt 2.5E+01 ug/L 1.1E-05 mg/kg-day 3.0E-04 mg/kg-day 0.04

Iron 1.6E+04 ug/L 6.6E-03 mg/kg-day 7.0E-01 mg/kg-day 0.009

Manganese 5.1E+02 ug/L 2.2E-04 mg/kg-day 9.6E-04 mg/kg-day 0.2

Vanadium 9.3E+01 ug/L 3.9E-05 mg/kg-day 1.3E-04 mg/kg-day 0.3

Benzene 6.4E-01 ug/L 6.2E-06 mg/kg-day 4.0E-03 mg/kg-day 0.002


Chloroform 6.4E-01 ug/L 3.6E-06 mg/kg-day 1.0E-02 mg/kg-day 0.0004

1,2-Dibromoethane 9.4E-01 ug/L 3.4E-06 mg/kg-day 9.0E-03 mg/kg-day 0.0004

1,1-Dichloroethane 6.6E-01 ug/L 3.3E-06 mg/kg-day 2.0E-01 mg/kg-day 0.00002

trans-1,3-Dichloropropene 1.1E+00 ug/L 3.7E-06 mg/kg-day 3.0E-02 mg/kg-day 0.0001

Ethylbenzene 2.0E+00 ug/L 7.4E-05 mg/kg-day 1.0E-01 mg/kg-day 0.0007

Naphthalene 7.3E-01 ug/L 3.0E-05 mg/kg-day 2.0E-02 mg/kg-day 0.001

1,1,2,2-Tetrachloroethane 9.3E-01 ug/L 7.2E-06 mg/kg-day 2.0E-02 mg/kg-day 0.0004

Tetrachloroethene 4.1E+03 ug/L 1.5E-01 mg/kg-day 6.0E-03 mg/kg-day 25

1,1,2-Trichloroethane 1.5E+01 ug/L 8.7E-05 mg/kg-day 4.0E-03 mg/kg-day 0.02

Exp. Route Total 26

Groundwater Water Bath Inhalation Benzene 6.4E-01 ug/L 2.3E-01 ug/m3 3.0E-02 mg/m3 0.008

Carbon Tetrachloride 3.7E+00 ug/L 1.3E+00 ug/m3 1.0E-01 mg/m3 0.01

Chloroform 6.4E-01 ug/L 2.3E-01 ug/m3 9.8E-02 mg/m3 0.002

1,2-Dibromoethane 9.4E-01 ug/L 3.4E-01 ug/m3 9.0E-03 mg/m3 0.04

1,1-Dichloroethane 6.6E-01 ug/L 2.4E-01 ug/m3 NA mg/m3 NA

trans-1,3-Dichloropropene 1.1E+00 ug/L 4.0E-01 ug/m3 2.0E-02 mg/m3 0.02

Ethylbenzene 2.0E+00 ug/L 7.2E-01 ug/m3 1.0E+00 mg/m3 0.0007

Naphthalene 7.3E-01 ug/L 2.6E-01 ug/m3 3.0E-03 mg/m3 0.09

1,1,2,2-Tetrachloroethane 9.3E-01 ug/L 3.3E-01 ug/m3 NA mg/m3 NA

Tetrachloroethene 4.1E+03 ug/L 1.5E+03 ug/m3 4.0E-02 mg/m3 36

1,1,2-Trichloroethane 1.5E+01 ug/L 5.4E+00 ug/m32.0E-04 mg/m3

27

Exp. Route Total 64

Exposure Medium Total 144

Hazard Quotient

TABLE 5.21-Rev





Page 1 of 1


Medium: Groundwater


Exposure Point: Near Site Groundwater


Receptor Age: Child/Adult

Exposure Exposure Exposure Chemical of EPC Cancer Risk Calculations

Medium Medium Point Route

Potential Concern

Value Units IntakeCancer Risk


Groundwater Water Tap Ingestion Aluminum 1.7E+04 ug/L 2.5E-01 mg/kg-day N/A (mg/kg-day)-1 -- -- NA

Arsenic 2.0E+00 ug/L 2.9E-05 mg/kg-day 1.5E+00 (mg/kg-day)-1 -- -- 4.4E-05

Chromium 2.6E-04

Age 0 -2 years 1.1E+01 ug/L 2.1E-05 mg/kg-day 5.0E-01 (mg/kg-day)-1 10 1.0E-04

Age 2 - 6 years 1.1E+01 ug/L 4.1E-05 mg/kg-day 5.0E-01 (mg/kg-day)-1 3 6.2E-05



Cobalt 2.5E+01 ug/L 3.7E-04 mg/kg-day N/A (mg/kg-day)-1 -- -- N/A

Iron 1.6E+04 ug/L 2.3E-01 mg/kg-day N/A (mg/kg-day)-1 -- -- N/A

Manganese 5.1E+02 ug/L 7.7E-03 mg/kg-day N/A (mg/kg-day)-1 -- -- N/A

Vanadium 9.3E+01 ug/L 1.4E-03 mg/kg-day N/A (mg/kg-day)-1 -- -- N/A

Benzene 6.4E-01 ug/L 9.5E-06 mg/kg-day 5.5E-02 (mg/kg-day)-1 -- -- 5.2E-07

Carbon Tetrachloride 3.7E+00 ug/L 5.5E-05 mg/kg-day 7.0E-02 (mg/kg-day)-1 -- -- 3.9E-06

Chloroform 6.4E-01 ug/L 9.6E-06 mg/kg-day 3.1E-02 (mg/kg-day)-1 -- -- 3.0E-07

1,2-Dibromoethane 9.4E-01 ug/L 1.4E-05 mg/kg-day 2.0E+00 (mg/kg-day)-1 -- -- 2.8E-05

1,1-Dichloroethane 6.6E-01 ug/L 9.9E-06 mg/kg-day 5.7E-03 (mg/kg-day)-1 -- -- 5.6E-08

trans-1,3-Dichloropropene 1.1E+00 ug/L 1.6E-05 mg/kg-day 1.0E-01 (mg/kg-day)-1 -- -- 1.6E-06

Ethylbenzene 2.0E+00 ug/L 3.0E-05 mg/kg-day 1.1E-02 (mg/kg-day)-1 -- -- 3.3E-07

Naphthalene 7.3E-01 ug/L 1.1E-05 mg/kg-day NA (mg/kg-day)-1 -- -- NA

1,1,2,2-Tetrachloroethane 9.3E-01 ug/L 1.4E-05 mg/kg-day 2.0E-01 (mg/kg-day)-1 -- -- 2.8E-06


1,1,2-Trichloroethane 1.5E+01 ug/L 2.2E-04 mg/kg-day 5.7E-02 (mg/kg-day)-1 -- -- 1.3E-05


Groundwater Water Shower Dermal contact Aluminum 1.7E+04 ug/L 1.4E-03 mg/kg-day N/A (mg/kg-day)-1 -- -- NA

Arsenic 2.0E+00 ug/L 1.7E-07 mg/kg-day 1.5E+00 (mg/kg-day)-1 -- -- 2.5E-07

Chromium 1.3E-04

Age 0 -2 years 1.1E+01 ug/L 2.7E-07 mg/kg-day 2.0E+01 (mg/kg-day)-1 10 5.4E-05

Age 2 - 6 years 1.1E+01 ug/L 5.4E-07 mg/kg-day 2.0E+01 (mg/kg-day)-1 3 3.2E-05



Cobalt 2.5E+01 ug/L 2.1E-06 mg/kg-day N/A (mg/kg-day)-1 -- -- N/A

Iron 1.6E+04 ug/L 1.3E-03 mg/kg-day N/A (mg/kg-day)-1 -- -- N/A

Manganese 5.1E+02 ug/L 4.4E-05 mg/kg-day N/A (mg/kg-day)-1 -- -- N/A

Vanadium 9.3E+01 ug/L 7.9E-06 mg/kg-day N/A (mg/kg-day)-1 -- -- N/A

Benzene 6.4E-01 ug/L 1.4E-06 mg/kg-day 5.5E-02 (mg/kg-day)-1 -- -- 8.0E-08

Carbon Tetrachloride 3.7E+00 ug/L 1.5E-05 mg/kg-day 7.0E-02 (mg/kg-day)-1 -- -- 1.0E-06

Chloroform 6.4E-01 ug/L 8.6E-07 mg/kg-day 3.1E-02 (mg/kg-day)-1 -- -- 2.7E-08

1,2-Dibromoethane 9.4E-01 ug/L 8.0E-07 mg/kg-day 2.0E+00 (mg/kg-day)-1 -- -- 1.6E-06

1,1-Dichloroethane 6.6E-01 ug/L 1.4E-06 mg/kg-day 5.7E-03 (mg/kg-day)-1 -- -- 7.8E-09

trans-1,3-Dichloropropene 1.1E+00 ug/L 8.8E-07 mg/kg-day 1.0E-01 (mg/kg-day)-1 -- -- 8.8E-08

Ethylbenzene 2.0E+00 ug/L 1.8E-05 mg/kg-day 1.1E-02 (mg/kg-day)-1 -- -- 1.9E-07

Naphthalene 7.3E-01 ug/L 7.1E-06 mg/kg-day NA (mg/kg-day)-1 -- -- NA

1,1,2,2-Tetrachloroethane 9.3E-01 ug/L 1.7E-06 mg/kg-day 2.0E-01 (mg/kg-day)-1 -- -- 3.4E-07


1,1,2-Trichloroethane 1.5E+01 ug/L 2.1E-05 mg/kg-day 5.7E-02 (mg/kg-day)-1-- -- 1.2E-06


Groundwater Water Shower Inhalation Benzene 6.4E-01 ug/L 9.8E-02 ug/m3 7.8E-06 (ug/m3)-1 -- -- 7.7E-07

Carbon Tetrachloride 3.7E+00 ug/L 5.7E-01 ug/m3 6.0E-06 (ug/m3)-1 -- -- 3.4E-06

Chloroform 6.4E-01 ug/L 9.9E-02 ug/m3 2.3E-05 (ug/m3)-1 -- -- 2.3E-06

1,2-Dibromoethane 9.4E-01 ug/L 1.4E-01 ug/m3 6.0E-04 (ug/m3)-1 -- -- 8.7E-05

1,1-Dichloroethane 6.6E-01 ug/L 1.0E-01 ug/m3 1.6E-06 (ug/m3)-1 -- -- 1.6E-07

trans-1,3-Dichloropropene 1.1E+00 ug/L 1.7E-01 ug/m3 4.0E-06 (ug/m3)-1 -- -- 6.8E-07

Ethylbenzene 2.0E+00 ug/L 3.1E-01 ug/m3 2.5E-06 (ug/m3)-1 -- -- 7.7E-07

Naphthalene 7.3E-01 ug/L 1.1E-01 ug/m3 3.4E-05 (ug/m3)-1 -- -- 3.8E-06

1,1,2,2-Tetrachloroethane 9.3E-01 ug/L 1.4E-01 ug/m3 5.8E-05 (ug/m3)-1 -- -- 8.3E-06

Tetrachloroethene 4.1E+03 ug/L 6.3E+02 ug/m3 2.6E-07 (ug/m3)-1 -- -- 1.6E-04

1,1,2-Trichloroethane 1.5E+01 ug/L 2.3E+00 ug/m31.6E-05 (ug/m3)-1

-- -- 3.7E-05


Exposure Medium Total 1.0E-03

CSF/Unit Risk


Factors (unitless)Age-Dependent

Cancer Risk




Page 1 of 1

TABLE 5.23-Rev

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR COPCs



Scenario Timeframe: CurrentReceptor Population: Indoor Industrial WorkerReceptor Age: Adult

Ingestion Inhalation Dermal Exposure Primary Ingestion Inhalation Dermal Exposure

Routes Total Target Organ Routes Total

Arsenic 7.5E-07 1E-09 - - 7.6E-07 ArsenicSkin/Vascular (ingestion)Development, vascular, neurological (inhalation)

0.005 0.00005 - - 0.005

Chromium 1.2E-06 7E-08 - - 1.3E-06 Chromium None Reported 0.002 0.00002 - - 0.002

Chemical Total 2.0E-06 7.0E-08 - - 2.0E-06 Chemical Total - - 0.007 0.00008 - - 0.007

2.0E-06 0.007

2.0E-06 0.007

Benzene -- 5.8E-07 -- 5.8E-07 Benzene Blood -- 0.007 -- 0.007

1,4-Dioxane -- 7.1E-05 -- 7.1E-05 1,4-Dioxane Liver and Kidney -- 1.3 -- 1.3

Ethylbenzene -- 1.7E-07 -- 1.7E-07 Ethylbenzene Development -- 0.0002 -- 0.0002

Tetrachloroethene -- 1.2E-06 -- 1.2E-06 Tetrachloroethene Neurological -- 0.3 -- 0.3

Trichloroethene -- 1.3E-07 -- 1.3E-07 TrichloroetheneDevelopment, Heart,

Immune System-- 0.04 -- 0.04

Chemical Total 7.3E-05 7.3E-05 Chemical Total 2 2

Exposure Medium Total 7.3E-05 2

Total Risk Across All Media 7.5E-05 Total Hazard Index Across All Media 2

Total Skin/Vascular HI = 0.005

Total Liver HI = 1.3

Total Kidney HI = 1.3

Total Development HI = 0.04

Total Immune System HI = 0.04

Total Blood HI = 0.007

Total Neurological HI = 0.3

Surface Soil

Air (Soil Gas) Vapor Intrusion from W. Hwy. 6 & Hwy.

281 Site

Surface Soil at W. Hwy. 6 & Hwy. 281

Site

Surface Soil

Exposure Point Total

Exposure Medium Total

Non-Carcinogenic Hazard Quotient

MediumExposureMedium

Chemical ChemicalExposure

Point

Carcinogenic Risk

Page 1 of 1

TABLE 5.24-Rev




Scenario Timeframe: CurrentReceptor Population: Outdoor Industrial WorkerReceptor Age: Adult



Arsenic 1.4E-06 1.1E-09 4.5E-07 1.8E-06 ArsenicSkin/Vascular (ingestion)Development, vascular, neurological (inhalation)

0.008 0.00005 0.003 0.01

Chromium 2.2E-06 6.2E-08 -- 2.2E-06 Chromium N/A 0.004 0.00002 -- 0.004

Chemical Total 3.5E-06 6.3E-08 4.5E-07 4.0E-06 Chemical Total - - 0.01 0.00007 0.003 0.02

4.0E-06 0.02

4.0E-06 0.02

Total Risk Across All Media 4.0E-06 Total Hazard Index Across All Media 0.02




Point

Carcinogenic Risk

Surface Soil Surface Soil at W. Hwy. 6 & Hwy. 281

Site

Surface Soil



Page 1 of 1

TABLE 5.25-Rev




Scenario Timeframe: FutureReceptor Population: Indoor Industrial WorkerReceptor Age: Adult



Arsenic 8.1E-07 1.5E-09 - - 8.1E-07 ArsenicSkin/Vascular (ingestion)Development, vascular, neurological (inhalation)

0.006 0.00006 - - 0.006

Chromium 9.0E-06 5.8E-07 - - 9.6E-06 Chromium None Reported 0.02 0.0002 - - 0.02


1.0E-05 0.02

1.0E-05 0.02


1,4-Dioxane -- 7.1E-05 -- 7.1E-05 1,4-Dioxane Liver and Kidney -- 1.3 1.3








Total Skin/Vascular HI = 0.006


Total Kidney HI = 1.3





Total None Reported HI = 0.02




Point

Carcinogenic Risk

Surface Soil

Air (Soil Gas) Vapor Intrusion from W. Hwy. 6 & Hwy.

281 Site


Site

Surface Soil



Page 1 of 1

TABLE 5.26-Rev




Scenario Timeframe: FutureReceptor Population: Outdoor Industrial WorkerReceptor Age: Adult




0.01 0.00006 0.003 0.01

Chromium 1.8E-05 5.2E-07 -- 1.9E-05 Chromium NA 0.03 0.0002 -- 0.03


2.1E-05 0.05

2.1E-05 0.05



Site

Surface Soil






Point

Carcinogenic Risk

Page 1 of 1

TABLE 5.27-Rev




Scenario Timeframe: FutureReceptor Population: Construction WorkerReceptor Age: Adult



Arsenic 2.1E-07 - - 3.2E-08 2.4E-07 Arsenic Skin/Vascular 0.03 - - 0.005 0.04

Chromium 6.3E-07 - - -- 6.3E-07 Chromium None Reported 0.03 - - -- 0.03

Chemical Total 8.4E-07 - - 3.2E-08 8.7E-07 Chemical Total - - 0.06 - - 0.005 0.07

8.7E-07 0.07

8.7E-07 0.07

Aluminum -- NA -- NA Aluminum Neurological -- 1.1 -- 1.1

Arsenic -- 1.5E-07 -- 1.5E-07 ArsenicDevelopment, Vascular

System, Nervous System-- 0.2 -- 0.2

Cadmium -- 2.7E-08 -- 2.7E-08 Cadmium Kidneys -- 0.1 -- 0.1

Chromium -- 1.5E-05 -- 1.5E-05 Chromium Lungs -- 0.1 -- 0.1

Cobalt -- 3.8E-07 -- 3.8E-07 Cobalt Respiratory -- 0.5 -- 0.5

Manganese -- NA -- NA Manganese CNS -- 3 -- 3

Nickel -- 2.3E-08 -- 2.3E-08 Nickel Respiratory, Blood, Liver -- 0.5 -- 0.5




Total Skin HI = 0.04


Total Kidneys HI = 0.1



Total Respiratory/Lungs HI = 1.1

Total CNS/Neurological HI = 4

Total Vascular System HI = 0.2

Surface and Subsurface Soil

Air

Volatile and Fugitive Dust Emissions from W. Hwy. 6 & Hwy.

281 Site

Surface and Subsurface Soil at

W. Hwy. 6 & Hwy. 281 Site







Point

Carcinogenic Risk

Page 1 of 1

TABLE 5.28-Rev




Scenario Timeframe: CurrentReceptor Population: TrespasserReceptor Age: Adolescent




0.003 0.00001 0.002 0.005

Chromium 8.2E-07 1.6E-08 -- 8.3E-07 Chromium None Reported 0.001 0.000005 -- 0.001

Vanadium N/A N/A -- N/A Vanadium Hair 0.001 0.000008 -- 0.001


1.2E-06 0.008

1.2E-06 0.008

Sediment Arsenic 2.7E-07 - - 2.3E-07 4.9E-07 Arsenic Skin/Vascular 0.004 -- 0.004 0.008

Chromium 6.8E-07 - - -- 6.8E-07 Chromium None Reported 0.001 -- -- 0.001

Vanadium N/A - - -- N/A Vanadium Hair 0.001 -- -- 0.001

Chemical Total 9.4E-07 - - 2.3E-07 1.2E-06 Chemical Total 0.007 - - 0.004 0.01

Exposure Medium Total 1.2E-06 0.01


ChemicalExposure

Point

Carcinogenic Risk

Sediment Sediment at W. Hwy. 6 & Hwy. 281

Site Pond




Site

Surface Soil



Chemical

Page 1 of 1

TABLE 5.29-Rev




Scenario Timeframe: FutureReceptor Population: TrespasserReceptor Age: Adolescent




0.003 0.00001 0.003 0.006


Vanadium N/A N/A N/A N/A Vanadium Hair 0.001 0.000008 -- 0.001


7.4E-06 0.02

7.4E-06 0.02



Vanadium N/A - - N/A N/A Vanadium Hair 0.001 -- -- 0.001





Site Pond



Site



Surface Soil


ExposurePoint

Chemical Chemical

Carcinogenic Risk

Page 1 of 1

TABLE 5.30-Rev

SUMMARY OF RECEPTOR HAZARDS FOR COPCs



Scenario Timeframe: CurrentReceptor Population: Off-Site ResidentReceptor Age: Child



Arsenic -- -- -- -- Arsenic Skin/Vascular 0.5 N/A 0.003 0.5

Chromium -- -- -- -- Chromium None Reported 0.02 N/A 0.01 0.03

Carbon Tetrachloride -- -- -- -- Carbon Tetrachloride Liver 0.03 0.006 0.007 0.04

Chloroform -- -- -- -- Chloroform Liver 0.006 0.004 0.0006 0.01

Tetrachloroethene -- -- -- -- Tetrachloroethene Neurological 1.3 1.1 0.7 3

Chemical Total -- Chemical Total 2 1.1 0.8 4

Exposure Medium Total -- 4

-- 4

Total Risk Across All Media -- Total Hazard Index Across All Media 4

Total Skin HI Across All Media 0.5

Total Vascular HI Across All Media 0.5

Total Liver HI Across All Media 0.05




Point

Carcinogenic Risk

Groundwater Total

Groundwater Groundwater Groundwater from W. Hwy. 6 & Hwy.

281 Site

Page 1 of 1

TABLE 5.31-Rev

SUMMARY OF RECEPTOR RISKS FOR COPCs



Scenario Timeframe: CurrentReceptor Population: Off-Site ResidentReceptor Age: Child/Adult



Arsenic 5.3E-05 -- 3.0E-07 5.3E-05 Arsenic Skin/Vascular -- -- -- --

Chromium 2.0E-05 -- 9.8E-06 3.0E-05 Chromium None Reported

Carbon Tetrachloride 1.7E-06 1.5E-06 4.4E-07 3.6E-06 Carbon Tetrachloride Liver -- -- -- --

Chloroform 4.6E-07 3.5E-06 4.1E-08 4.0E-06 Chloroform Liver -- -- -- --

Tetrachloroethene 3.8E-06 4.8E-06 2.2E-06 1.1E-05 Tetrachloroethene Neurological -- -- -- --

Chemical Total 7.9E-05 9.8E-06 1.3E-05 1.0E-04 Chemical Total -- -- -- --

Exposure Medium Total 1.0E-04 --

1.0E-04 --

Total Risk Across All Media 1.0E-04 Total Hazard Index Across All Media --




Point

Carcinogenic Risk

Groundwater Total


281 Site

Page 1 of 1

TABLE 5.32-Rev

SUMMARY OF RECEPTOR HAZARDS FOR COPCs



Scenario Timeframe: FutureReceptor Population: On-Site ResidentReceptor Age: Child



Arsenic - - - - - - - - ArsenicSkin/Vascular (ingestion)

Development, vascular, neurological (inhalation)

0.1 0.0003 0.02 0.2

Chromium - - - - - - - - Chromium None Reported 0.5 0.0008 -- 0.5

Vanadium - - - - - - - - Vanadium Hair 0.06 0.0002 -- 0.06

Chemical Total - - - - - - - - Chemical Total - - 0.7 0.001 0.02 0.7

- - 0.7

- - 0.7

Air (Soil Gas) Benzene - - - - - - - - Benzene Blood -- 0.03 -- 0.03

1,4-Dioxane 1,4-Dioxane Liver and Kidney -- 6 -- 6

Ethylbenzene - - - - - - - - Ethylbenzene Development -- 0.0008 -- 0.0008

Tetrachloroethene - - - - - - - - Tetrachloroethene Neurological -- 1.4 -- 1.4

Trichloroethene - - - - - - - - TrichloroetheneDevelopment, Heart,

Immune System -- 0.2 -- 0.2

Chemical Total - - - - - - - - Chemical Total - - - - 7 - - 7

Exposure Medium Total - - 7

- - 8

Aluminum -- -- -- -- Aluminum Neurological 1.1 -- 0.007 1.1

Arsenic -- -- -- -- Arsenic Skin/Vascular 0.4 -- 0.003 0.4

Chromium -- -- -- -- Chromium None Reported 0.2 -- 0.1 0.4

Cobalt -- -- -- -- Cobalt Thyroid 5 -- 0.04 5

Iron -- -- -- -- Iron Gastrointestinal 1.4 -- 0.01 1.4

Manganese -- -- -- -- Manganese CNS 1.4 -- 0.2 2

Vanadium -- -- -- -- Vanadium Hair 1.2 -- 0.3 1.5

Benzene -- -- -- -- Benzene Blood 0.01 0.008 0.002 0.02



1,2-Dibromoethane-- -- --

-- 1,2-DibromoethaneLiver, Reproductive, Endocrine

(ingestion)Nasal (inhalation) 0.007 0.04 0.0004

0.04

1,1-Dichloroethane -- -- -- -- 1,1-Dichloroethane Kidney 0.0002 NA 0.00002 0.0002

trans-1,3-Dichloropropene -- -- -- -- trans-1,3-DichloropropeneStomach (ingestion)Nasal (inhalation) 0.002 0.02 0.0001 0.02

Ethylbenzene-- -- --

-- EthylbenzeneLiver, Kidney (ingestion)Development (inhalation) 0.001 0.0007 0.0007

0.003

Naphthalene-- -- --

-- NaphthaleneBody Weight (ingestion)

Nasal (inhalation) 0.002 0.09 0.0010.09

1,1,2,2-Tetrachloroethane -- -- -- -- 1,1,2,2-Tetrachloroethane Liver 0.003 NA 0.0004 0.003

Tetrachloroethene -- -- -- -- Tetrachloroethene Neurological 43 36 25 105

1,1,2-Trichloroethane-- -- --

-- 1,1,2-Trichloroethane Blood, Immune System (ingestion)Nasal (inhalation) 0.2 27 0.02

27

Chemical Total -- Chemical Total 55 64 26 144


-- 144


Total Gastrointestinal Tract HI Across All Media 1.4

Total Skin HI Across All Media 0.6

Total Kidneys HI Across All Media 6

Total Vascular HI Across All Media 0.6

Total Body Weight HI Across All Media 0.004

Total Liver HI Across All Media 6

Total CNS/Neurological HI Across All Media 109

Total Blood HI Across All Media 0.3

Total Reproductive HI Across All Media 0.04

Total Thyroid HI Across All Media 5

Groundwater from W. Hwy. 6 & Hwy.

281 Site

Groundwater Groundwater

Surface Soil

Surface Soil Total

Groundwater Total

Surface Soil




Site

Vapor Intrusion




Point

Carcinogenic Risk

Page 1 of 1

TABLE 5.33-Rev

SUMMARY OF RECEPTOR RISKS FOR COPCs



Scenario Timeframe: FutureReceptor Population: On-Site ResidentReceptor Age: Child/Adult



Arsenic 8.0E-06 7.4E-09 1.3E-06 9.3E-06 Arsenic Skin/Vascular - - - - - - - -

Chromium 3.8E-04 7.4E-06 -- 3.9E-04 Chromium N/A - - - - - - - -

Vanadium N/A N/A -- N/A Vanadium Kidneys - - - - - - - -

Chemical Total 3.9E-04 7.4E-06 1.3E-06 4.0E-04 Chemical Total - - - - - - - - - -

4.0E-04 - -

4.0E-04 - -

Benzene - - 2.9E-06 - - 2.9E-06 Benzene Blood -- -- -- --

1,4-Dioxane - - 3.6E-04 - - 3.6E-04 1,4-Dioxane Liver

Ethylbenzene - - 8.4E-07 - - 8.4E-07 Ethylbenzene Development -- -- -- --

Tetrachloroethene - - 6.2E-06 - - 6.2E-06 Tetrachloroethene Neurological -- -- -- --

Trichloroethene - - 8.7E-07 - - 8.7E-07 Trichloroethene N/A -- -- -- --

Chemical Total - - 3.7E-04 - - 3.7E-04 Chemical Total -- --


7.7E-04 - -

Aluminum NA -- NA -- Aluminum Neurological -- -- -- --

Arsenic 4.4E-05 -- 2.5E-07 4.4E-05 Arsenic Skin/Vascular -- -- -- --

Chromium 2.6E-04 -- 1.3E-04 3.9E-04 Chromium N/A -- -- -- --

Cobalt N/A -- N/A -- Cobalt Blood -- -- -- --

Iron N/A -- N/A -- Iron Gastrointestinal -- -- -- --

Manganese N/A -- N/A -- Manganese CNS -- -- -- --

Vanadium N/A -- N/A -- Vanadium Kidneys -- -- -- --

Benzene 5.2E-07 7.7E-07 8.0E-08 1.4E-06 Benzene Blood -- -- -- --



1,2-Dibromoethane 2.8E-05 8.7E-05 1.6E-06 1.2E-04 1,2-Dibromoethane Liver, Reproductive -- -- -- --

1,1-Dichloroethane 5.6E-08 1.6E-07 7.8E-09 2.3E-07 1,1-Dichloroethane N/A -- -- -- --

trans-1,3-Dichloropropene 1.6E-06 6.8E-07 8.8E-08 2.4E-06 trans-1,3-Dichloropropene Stomach -- -- -- --

Ethylbenzene 3.3E-07 7.7E-07 1.9E-07 1.3E-06 Ethylbenzene Liver, Kidney -- -- -- --

Naphthalene NA 3.8E-06 NA 3.8E-06 Naphthalene Body Weight -- -- -- --

1,1,2,2-Tetrachloroethane 2.8E-06 8.3E-06 3.4E-07 1.1E-05 1,1,2,2-Tetrachloroethane Liver -- -- -- --

Tetrachloroethene 1.3E-04 1.6E-04 7.5E-05 3.6E-04 Tetrachloroethene Liver -- -- -- --

1,1,2-Trichloroethane 1.3E-05 3.7E-05 1.2E-06 5.1E-05 1,1,2-Trichloroethane Blood -- -- -- --



1.0E-03 --


Groundwater Total


281 Site

Surface Soil

Surface Soil Total



Point

Carcinogenic Risk

Air (Soil Gas) Vapor Intrusion



Site

Surface Soil



Page 1 of 1

TABLE 5.34

SUMMARY OF RECEPTOR RISKS AND HAZARDS FOR SITE-RELATED COPCs



Scenario Timeframe: CurrentReceptor Population: Indoor Industrial WorkerReceptor Age: Adult



Arsenic Arsenic

Skin/Vascular (ingestion)Development, vascular, neurological (inhalation)

Chromium 1.2E-06 7E-08 - - 1.3E-06 Chromium None Reported 0.002 0.00002 - - 0.002


1.3E-06 0.00

1.3E-06 0.00


1,4-Dioxane -- 7.1E-05 -- 7.1E-05 1,4-Dioxane Liver and Kidney -- 1.3 -- 1.3














Surface Soil

Air (Soil Gas)




Point

Carcinogenic Risk

Vapor Intrusion from W. Hwy. 6 & Hwy.

281 Site


Site

Surface Soil



Background Constituent Background Constituent

Page 1 of 1

TABLE 5.35




Scenario Timeframe: CurrentReceptor Population: Outdoor Industrial WorkerReceptor Age: Adult



Arsenic ArsenicSkin/Vascular (ingestion)Development, vascular, neurological (inhalation)


Chemical Total 2.2E-06 6.2E-08 0.0E+00 2.2E-06 Chemical Total - - 0.004 0.00002 -- 0.004

2.2E-06 0.004

2.2E-06 0.004



Site

Surface Soil







Point

Carcinogenic Risk

Page 1 of 1

TABLE 5.36




Scenario Timeframe: FutureReceptor Population: Indoor Industrial WorkerReceptor Age: Adult




Chromium 9.0E-06 5.8E-07 - - 9.6E-06 Chromium N/A 0.02 0.0002 - - 0.02


9.6E-06 0.02

9.6E-06 0.02


1,4-Dioxane -- 7.1E-05 -- 7.1E-05 1,4-Dioxane Liver and Kidney -- 1.3 1.3














Total None Reported HI = 0.02

Vapor Intrusion from W. Hwy. 6 & Hwy.

281 Site


Site

Surface Soil







Point

Carcinogenic Risk

Surface Soil

Air (Soil Gas)

Page 1 of 1

TABLE 5.37




Scenario Timeframe: FutureReceptor Population: Outdoor Industrial WorkerReceptor Age: Adult




Chromium 1.8E-05 5.2E-07 -- 1.9E-05 Chromium NA 0.03 0.0002 -- 0.03


1.9E-05 0.03

1.9E-05 0.03


Surface Soil




Point

Carcinogenic Risk


Site

Surface Soil




Page 1 of 1

TABLE 5.38




Scenario Timeframe: FutureReceptor Population: Construction WorkerReceptor Age: Adult




Chromium 6.3E-07 - - -- 6.3E-07 Chromium None Reported 0.03 - - -- 0.03

Chemical Total 6.3E-07 - - 0.0E+00 6.3E-07 Chemical Total - - 0.03 - - 0.000 0.03

6.3E-07 0.03

6.3E-07 0.03

Aluminum Aluminum Neurological

Arsenic ArsenicDevelopment, Vascular

System, Nervous System

Cadmium -- 2.7E-08 -- 2.7E-08 Cadmium Kidneys -- 0.1 -- 0.1

Chromium -- 1.5E-05 -- 1.5E-05 Chromium Lungs -- 0.1 -- 0.1

Cobalt Cobalt Respiratory

Manganese Manganese CNS

Nickel -- 2.3E-08 -- 2.3E-08 Nickel Respiratory, Blood, Liver -- 0.5 -- 0.5

Chemical Total 1.5E-05 1.5E-05 Chemical Total 0.7 0.7



Total Skin HI = 0.00




Total Respiratory System/Lungs HI = 0.6


Background Constituent











Point

Carcinogenic Risk


Air

Volatile and Fugitive Dust Emissions from W. Hwy. 6 & Hwy.

281 Site

Surface and Subsurface Soil at

W. Hwy. 6 & Hwy. 281 Site




Page 1 of 1

TABLE 5.39




Scenario Timeframe: CurrentReceptor Population: TrespasserReceptor Age: Adolescent





Vanadium N/A N/A -- N/A Vanadium Hair 0.001 0.000008 -- 0.001


8.3E-07 0.003

8.3E-07 0.003



Vanadium N/A - - -- N/A Vanadium Hair 0.001 -- -- 0.001





Site

Surface Soil



Chemical


ExposurePoint

Carcinogenic Risk


Site Pond




Chemical

Page 1 of 1

TABLE 5.40




Scenario Timeframe: FutureReceptor Population: TrespasserReceptor Age: Adolescent





Vanadium N/A N/A N/A N/A Vanadium Hair 0.001 0.000008 -- 0.001


7.0E-06 0.01

7.0E-06 0.01


Chromium 6.8E-07 - - -- 6.8E-07 Chromium N/A 0.001 -- -- 0.001

Vanadium N/A - - N/A N/A Vanadium Hair 0.001 -- -- 0.001





Surface Soil


ExposurePoint

Chemical Chemical

Carcinogenic Risk



Site Pond



Site



Page 1 of 1

TABLE 5.41

SUMMARY OF RECEPTOR HAZARDS FOR SITE-RELATED COPCs



Scenario Timeframe: CurrentReceptor Population: Off-Site ResidentReceptor Age: Child



Arsenic -- -- -- -- Arsenic Skin/Vascular

Chromium -- -- -- -- Chromium None Reported



Tetrachloroethene -- -- -- -- Tetrachloroethene Neurological 1.3 1.1 0.7 3

Chemical Total -- Chemical Total 1.3 1.1 0.7 3


-- 3


Total Liver HI Across All Media 0.05

Groundwater Total


281 Site






Point

Carcinogenic Risk

Page 1 of 1

TABLE 5.42

SUMMARY OF RECEPTOR RISKS FOR SITE-RELATED COPCs



Scenario Timeframe: CurrentReceptor Population: Off-Site ResidentReceptor Age: Child/Adult



Arsenic Arsenic Skin/Vascular -- -- -- --

Chromium Chromium None Reported






1.8E-05 --


Groundwater Total


281 Site






Point

Carcinogenic Risk

Page 1 of 1

TABLE 5.43

SUMMARY OF RECEPTOR HAZARDS FOR SITE-RELATED COPCs



Scenario Timeframe: FutureReceptor Population: On-Site ResidentReceptor Age: Child



Arsenic - - - - - - - - ArsenicSkin/Vascular (ingestion)Development, vascular, neurological (inhalation)

Chromium - - - - - - - - Chromium None Reported 0.5 0.0008 -- 0.5

Vanadium - - - - - - - - Vanadium Hair 0.06 0.0002 -- 0.06

Chemical Total - - - - - - - - Chemical Total - - 0.5 0.001 -- 0.5

- - 0.5

- - 0.5

Air (Soil Gas) Benzene - - - - - - - - Benzene Blood -- 0.03 -- 0.03

1,4-Dioxane 1,4-Dioxane Liver and Kidney -- 6 -- 6

Ethylbenzene - - - - - - - - Ethylbenzene Development -- 0.0008 -- 0.0008

Tetrachloroethene - - - - - - - - Tetrachloroethene Neurological -- 1.4 -- 1.4

Trichloroethene - - - - - - - - TrichloroetheneDevelopment, Heart,

Immune System -- 0.2 -- 0.2

Chemical Total - - - - - - - - Chemical Total - - - - 7 - - 7

Exposure Medium Total - - 7

- - 8

Aluminum -- -- -- -- Aluminum Neurological 1.1 -- 0.007 1.1

Arsenic -- -- -- -- Arsenic Skin/Vascular

Chromium -- -- -- -- Chromium None Reported 0.2 -- 0.1 0.4

Cobalt -- -- -- -- Cobalt Thyroid

Iron -- -- -- -- Iron Gastrointestinal

Manganese -- -- -- -- Manganese CNS

Vanadium -- -- -- -- Vanadium Hair 1.2 -- 0.3 1.5

Benzene -- -- -- -- Benzene Blood 0.01 0.008 0.002 0.02



1,2-Dibromoethane

-- -- --

-- 1,2-DibromoethaneLiver, Reproductive, Endocrine

(ingestion)

Nasal (inhalation) 0.007 0.04 0.0004

0.04

1,1-Dichloroethane -- -- -- -- 1,1-Dichloroethene Kidney 0.0002 NA 0.00002 0.0002

trans-1,3-Dichloropropene-- -- --

-- trans-1,3-DichloropropeneStomach (ingestion)Nasal (inhalation) 0.002 0.02 0.0001

0.02

Ethylbenzene-- -- --

-- EthylbenzeneLiver, Kidney (ingestion)Development (inhalation) 0.001 0.0007 0.0007

0.003

Naphthalene-- -- --

-- NaphthaleneBody Weight (ingestion)

Nasal (inhalation) 0.002 0.09 0.0010.09

1,1,2,2-Tetrachloroethane -- -- -- -- 1,1,2,2-Tetrachloroethane Liver 0.003 NA 0.0004 0.003

Tetrachloroethene-- -- --

-- Tetrachloroethene Neurological43 36 25

105

1,1,2-Trichloroethane

-- -- --

-- 1,1,2-TrichloroethaneBlood, Immune System

(ingestion)Nasal (inhalation) 0.2 27 0.02

27

Chemical Total -- Chemical Total 46 64 25 135


-- 135


Total Gastrointestinal Tract HI Across All Media 0.002

Total Kidneys HI Across All Media 6

Total Body Weight HI Across All Media 0.004

Total Liver HI Across All Media 6

Total CNS/Neurological HI Across All Media 107

Total Blood HI Across All Media 0.3

Total Reproductive HI Across All Media 0.04

Groundwater from W. Hwy. 6 & Hwy.

281 Site

Groundwater Groundwater

Surface Soil

Surface Soil Total



Groundwater Total

Surface Soil




Site

Vapor Intrusion







Point

Carcinogenic Risk

Page 1 of 1

TABLE 5.44

SUMMARY OF RECEPTOR RISKS FOR SITE-RELATED COPCs



Scenario Timeframe: FutureReceptor Population: On-Site ResidentReceptor Age: Child/Adult




- - - - - - - -

Chromium 3.8E-04 7.4E-06 -- 3.9E-04 Chromium None Reported - - - - - - - -

Vanadium N/A N/A -- N/A Vanadium Hair - - - - - - - -

Chemical Total 3.8E-04 7.4E-06 0.0E+00 3.9E-04 Chemical Total - - - - - - - - - -

3.9E-04 - -

3.9E-04 - -

Benzene - - 2.9E-06 - - 2.9E-06 Benzene Blood -- -- -- --

1,4-Dioxane - - 3.6E-04 - - 3.6E-04 1,4-Dioxane Liver and Kidney

Ethylbenzene - - 8.4E-07 - - 8.4E-07 Ethylbenzene Development -- -- -- --

Tetrachloroethene - - 6.2E-06 - - 6.2E-06 Tetrachloroethene Neurological -- -- -- --

Trichloroethene - - 8.7E-07 - - 8.7E-07 TrichloroetheneDevelopment, Heart,

Immune System-- -- -- --

Chemical Total - - 3.7E-04 - - 3.7E-04 Chemical Total -- --


7.6E-04 - -

Aluminum NA -- NA -- Aluminum Neurological -- -- -- --

Arsenic Arsenic Skin/Vascular -- -- -- --

Chromium 2.6E-04 -- 1.3E-04 3.9E-04 Chromium None Reported -- -- -- --

Cobalt Cobalt Thyroid -- -- -- --

Iron Iron Gastrointestinal -- -- -- --

Manganese Manganese CNS -- -- -- --

Vanadium N/A -- N/A -- Vanadium Hair -- -- -- --

Benzene 5.2E-07 7.7E-07 8.0E-08 1.4E-06 Benzene Blood -- -- -- --



1,2-Dibromoethane2.8E-05 8.7E-05 1.6E-06

1.2E-04 1,2-Dibromoethane

Liver, Reproductive,

Endocrine (ingestion)

Nasal (inhalation) -- -- ----

1,1-Dichloroethane 5.6E-08 1.6E-07 7.8E-09 2.3E-07 1,1-Dichloroethene Kidney -- -- -- --

trans-1,3-Dichloropropene 1.6E-06 6.8E-07 8.8E-08 2.4E-06 trans-1,3-DichloropropeneStomach (ingestion)Nasal (inhalation) -- -- -- --

Ethylbenzene3.3E-07 7.7E-07 1.9E-07

1.3E-06 EthylbenzeneLiver, Kidney (ingestion)Development (inhalation) -- -- --

--

NaphthaleneNA 3.8E-06 NA

3.8E-06 NaphthaleneBody Weight (ingestion)

Nasal (inhalation) -- -- ----

1,1,2,2-Tetrachloroethane 2.8E-06 8.3E-06 3.4E-07 1.1E-05 1,1,2,2-Tetrachloroethane Liver -- -- -- --


1,1,2-Trichloroethane

1.3E-05 3.7E-05 1.2E-06

5.1E-05 1,1,2-TrichloroethaneBlood, Immune System

(ingestion)Nasal (inhalation) -- -- --

--



9.5E-04 --






Air (Soil Gas) Vapor Intrusion



Site

Surface Soil






Point

Carcinogenic Risk

Groundwater Total


281 Site

Surface Soil

Surface Soil Total

Page 1 of 1

exceeding expectations io - records collectionsnon-cancer hi cancer risk 2011 hhra 0.02 4.9e-06 2016...

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