Att 19- Time Critical Removal Action Report Tables and Attachments_0001.pdf

Table 1 Preliminary Remedial Goals Woolsey Fire Cleanup Santa Monica Mountains National Recreation Area, California

Chem Group Chemical CASRN

Background Threshold

Value (mg/kg)

Human Health-Based Preliminary

Remedial Goal (mg/kg)

Ecological- Based

Preliminary Remedial Goal

(mg/kg)

Overall Proposed Preliminary

Remedial Goal (mg/kg)

PCBs PCBs (total) 1336-36-3 -- 0.22 0.090 0.090 Metals Antimony 7440-36-0 4.1 100 11 11

Arsenic 7440-38-2 4.6 0.68 22 4.6 Barium 7440-39-3 130 52,000 170 170 Beryllium 7440-41-7 0.56 520 7.9 7.9 Cadmium 7440-43-9 4.6 230 4.7 4.7 Chromium III 16065-83-1 120 290,000 100 120 Chromium VI 18540-29-9 -- 1.4 1.1 1.1 Cobalt 7440-48-4 30 77 41 41 Copper 7440-50-8 31 10,000 140 140 Lead 7439-92-1 45 400 180 180 Manganese 7439-96-5 700 4,200 490 700 Mercury 7439-97-6 0.40 18 0.31 0.40 Molybdenum 7439-98-7 3.8 1,300 16 16 Nickel 7440-02-0 95 5,200 100 100 Selenium 7782-49-2 3.3 1,300 1.2 3.3 Silver 7440-22-4 -- 670 42 42 Thallium 7440-28-0 3.7 -- 0.16 3.7 Vanadium 7440-62-2 78 1,300 38 78 Zinc 7440-66-6 130 77,000 360 360

Dioxins/Furans 2,3,7,8-Tetrachlorodibenzo-p-dioxin 1746-01-6 -- 4.8E-06 3.0E-06 3.0E-06 Asbestos Asbestos 1332-21-4 -- -- -- --

Notes:

The overall preliminary remediation goal (PRG) is equal to the lower of the human health or ecological risk-based concentrations, unless lower than the background threshold value

(BTV).

-- No value calculated.

Preliminary Remedial Goals Woolsey Fire Cleanup Santa Monica Mountains National Recreation Area, California

FIGURES

Arroyo Sequit

Morrison Ranch

Circle X Ranch Paramount Ranch

Miller Property

Dragon Property

Peter Strauss Ranch

Rocky Oaks/Cooper Brown

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Woolsey Fire Cleanup

Lead Builders Inc.

Site Name Code Building Name

PR1 Freight Building

PR2 Quarters 107

PR3 Mercantile

PR4 Pavillion

PR5 Saloon

PR6 Horse Barn

PR7 Jail

PR8 Restroom

PR9 Hotel

PR10 Telegraph Office

PR11 Race Track Bridge

Paramount Ranch

PR4

PR3

PR2

PR5

PR9

PR10

PR7

PR6

PR8

PR1

Notes:

All features were destroyed in the

Woolsey Fire of November, 2018

PR11

Legend

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Imagery Source: February 19, 2019

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Approximate Extent of Burned Debris

0 75 150

Feet

1 inch = 75 feet

CLIENT:

PROJECT:

Woolsey Fire Cleanup

Lead Builders Inc.

Site Name Code Building Name

Peter Strauss Ranch PS1 Peter Strauss Ranch House

Notes:

All features were destroyed in the

Woolsey Fire of November, 2018

Imagery Source: June 12, 2019

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Rocky Oaks & Cooper Brown Location Map

Legend

!A Background Soil Sample Location

Approximate Extent of Burned Debris

0 100 200

Feet

1 inch = 100 feet

CLIENT:

PROJECT:

Woolsey Fire Cleanup

Lead Builders Inc.

Site Name Code Building Name

RO1 Quarters 102

RO2 Museum Building

RO3 Vault Restroom

RO4 Chicken Coup

Cooper Brown CB1 Cooper Brown House

Rocky Oaks

RO1

RO2

RO3

RO4

CB1

Notes:

All features were destroyed in the

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Approximate Extent of Burned Debris

0 100 200

Feet

1 inch = 100 feet

CLIENT:

PROJECT:

Woolsey Fire Cleanup

Lead Builders Inc.

Site Name Code Building Name

AS1 Quarters 113

AS2 Survey Office

AS3 Vault Restroom

AS4 Pump House

Arroyo Sequit Notes:

All features were destroyed in the

Source Aerial: March 13, 2019

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Circle X Ranch Location Map

Legend

Approximate Extent of Burned Debris

0 100 200

Feet

1 inch = 100 feet

CLIENT:

PROJECT:

Woolsey Fire Cleanup

Lead Builders Inc.

CX1

CX2 CX3

Site Name Code Building Name

CX1 Basketball Court

CX2 Vault Restroom A

CX3 Vault Restroom B

Circle X Ranch Notes:

All features were destroyed in the

Source Aerial: June 30, 2019

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Approximate Extent of Burned Debris

0 50 100

Feet

1 inch = 50 feet

CLIENT:

PROJECT:

Woolsey Fire Cleanup

Lead Builders Inc.

Site Name Code Building Name

MR1 Morrison Ranch House

MR2 Chicken Coup

MR3 Corral Area

Morrison Ranch Notes:

All features were destroyed in the

SAFETY FIRST

PROJECT NUMBER:

S073.001.001 FIGURE 8Ü

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Miller Property

Location Map

Legend

Approximate Extent of Burned Debris

0 50 100

Feet

1 inch = 50 feet

CLIENT:

PROJECT:

Woolsey Fire Cleanup

Lead Builders Inc.

Site Name Code Building Name

Miller Property MP1 Miller Property

MP1

Notes:

All features were destroyed in the

Source Imagery: March 13, 2019

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Approximate Location of Former Structures

0 50 100

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1 inch = 50 feet

CLIENT:

PROJECT:

Woolsey Fire Cleanup

Lead Builders Inc.

Site Name Code Building Name

DP1 Air Stream Trailer

DP2 Life Estate

DP3 Pump House

Dragon Property Notes:

All features were destroyed in the

Source Imagery: March 13, 2019

APPENDIX A

DERIVATION OF PRELIMINARY REMEDIAL GOALS

Terraphase Engineering Inc. | 18401 Von Karman Ave, Suite 410 | Irvine, California 92612 | www.terraphase.com

TECHNICAL MEMORANDUM

To:

Stephen Mitchell National Park Service

Patricia Billig National Park Service

From:

Kevin Long, Principal Darren Croteau, PG, Principal Geologist

Date:

March 2020

Project Number:

S073.001

Subject: Derivation of Preliminary Remedial Goals Time Critical Removal Action Woolsey Fire Cleanup, Santa Monica Mountains National Recreation Area, California

1. Introduction

Terraphase Engineering Inc. (Terraphase) has prepared this technical memorandum to document the assumptions and methodologies used to derive preliminary remedial goals (PRGs) which will be used to evaluate the post-cleanup confirmation soil sampling results following removal action associated with the Woolsey Fire Time Critical Removal Action (TCRA) at the Santa Monica Mountains National Recreation Area (SAMO) (the Site). This SAMO is located in Los Angeles and Ventura Counties, California and consists of 182,440 acres of land.

In November of 2018, the Woolsey Fire destroyed 21,000 acres (88%) of National Park Service (NPS) land within the Site, including 269 known archaeological sites, two cultural landscapes and 32 historical buildings. Nine project areas where structures were destroyed in the Fire are subject to TCRA which will involve the cleanup and removal of ash and debris associated with the Fire. Upon completion of this cleanup activity, soil sampling will be performed in each of the areas and the results will be evaluated to confirm that the cleanup has achieved conditions that will not pose an unacceptable risk to human health or the environment. The PRGs presented in this technical memorandum will be used to evaluate the post-cleanup confirmation soil sampling results.

Overall, the PRGs are based upon (1) naturally occurring site-specific background concentrations, (2) semi-site-specific risk-based human health soil concentrations for relevant scenarios of potential human exposure, and (3) risk-based ecological soil concentrations derived with consideration for the terrestrial ecological receptors present at the Site.

2. Naturally Occurring Site-Specific Background Concentrations

Table 1 presents the background soil sampling results and the estimated background threshold value (BTV) for each metal. The concentration of each metal in the post-removal soil samples will be compared to these estimates of the upper-end of the concentration range representative of site-specific background (i.e., not site-related). These BTVs were determined using the results from the background

March 2020 US National Park Service Woolsey Fire Time Critical Removal Action

Terraphase Engineering Inc. Page 2 of 3 soil samples collected during the TCRA investigation. Overall, metals with concentrations in soil not above these BTVs will not be considered chemicals of potential concern (COPC) and thus not site-related.

3. Human Health Risk-Based Concentrations

Terraphase derived risk-based concentrations for receptor exposure scenarios that are based upon current and reasonably anticipated future land use at and in the vicinity of the nine project areas. Based upon communication with the NPS, the receptors anticipated to be present at the Site include park residents, park employees, maintenance workers, construction workers, and park visitors. Their potential routes of exposure to soil would include incidental ingestion, dermal contact and inhalation soil-derived airborne particulates. Further details can be found in the Woolsey Fire Cleanup Sampling and Analysis Plan (Terraphase 2020).

Attachment 1 presents the high-end exposure factors used to quantify exposure for these receptors.

The exposure factors were based upon site-specific information provided by the NPS, as available and appropriate. When unavailable, exposure factors recommended by NPS were used.

The toxicity values used in the derivation of the risk-based concentrations were compiled from EPA’s hierarchy of sources as follows: (1) Integrated Risk Information System (IRIS), (2) Provisional Peer Reviewed Toxicity Values (PPRTV), and (3) other sources. When a toxicity value was not available from the first two tiers of the hierarchy, other EPA and non-EPA sources were used. The values used, and their sources, are presented in Attachment 1.

The fate and transport models used to calculate the risk-based concentrations were based upon the models used by EPA for conservative, screening level analysis. Physical/chemical properties used for these fate and transport models are also presented in Attachment 1. Vapor emissions from exposed soil were estimated using the Jury model (Jury et al. 1983), assuming conservatively that soil is impacted from the ground surface to an infinite depth. Emission of respirable soil particulates (PM10) for park residents, park employees, and park visitors were calculated using the wind erosion model recommended by EPA (1996). The air concentration of respirable soil particulates during hypothetical future site redevelopment or construction activities is conservatively equal to 50 ug/m3, which is the former annual average National Ambient Air Quality Standard (NAAQS) for PM10, because such workers are assumed to be performing excavations for a work year. It is conservatively assumed that the PM10 concentration would be at this limit every day for the entire period of redevelopment/construction. The emission calculations for each receptor are presented in Attachments 2 to 6.

The risk-based concentrations for each of these exposure scenarios have been derived for a target cancer risk of 1x10-6 and noncancer hazard quotient (HQ) of 1. The details of the risk-based concentration calculations for each exposure scenario for each receptor are presented in Attachments 2 to 6. The minimum of the cancer-based and noncancer-based calculations for each chemical were used for each exposure scenario.

Potential exposure of receptors to lead in soil was evaluated separately using generic default screening levels per EPA guidance. A conservative soil concentration for residential soil exposure to lead of 400 mg/kg for park residents will be used (EPA 2019). A conservative soil concentration of 2,500 mg/kg for park employees was derived in accordance with EPA guidance (2003b, 2016) to achieve the intended degree of protectiveness (10 ug/dL PbB at the 95th percentile) and is used as a surrogate for the other nonresidential receptors. Attachment 7 presents the derivation of this nonresidential lead concentration.

Terraphase Engineering Inc. Page 3 of 3

The calculated human health risk-based concentrations are presented on Table 2.

4. Ecological Risk-Based Concentrations

Terraphase derived risk-based concentrations for potentially exposed ecological receptor groups including terrestrial wildlife (i.e., birds, mammals), invertebrates and terrestrial vegetation. The potential exposure routes for terrestrial wildlife include ingestion and direct contact with ash/surface soil and food web exposure. Further details can be found in the Woolsey Fire Cleanup Sampling and Analysis Plan (Terraphase 2020).

Risk-based concentrations for mammals and avian ecological receptors were derived in accordance with applicable EPA guidance (1993, 1997a, 2005) while the risk-based concentrations for terrestrial invertebrates and vegetation were developed using information available in the Los Alamos National Laboratory’s (LANL) (2017) EcoRisk Database, Release 4.1.

With consideration for mammals and avian receptors, terrestrial food web modeling was used to estimate potential contaminant uptake into the following wildlife receptors:

Terrestrial Receptors of Interest (ROI)

American Robin (herbivore/invertivore)

Red-tailed Hawk (top level carnivore)

Deer Mouse (invertivore)

Red Fox (top level carnivore)

Most healthy ecosystems support a large number of individual species representing a variety of feeding guilds. However, it is not feasible to complete calculations for all potentially exposed species. Moreover, such an effort would be duplicative because of the similarity of exposure patterns among closely related species and among those with similar feeding guilds. For these reasons, surrogate ROIs are selected to represent the different feeding guilds. The ROIs noted in the table above represent receptors that are present within SAMO, are susceptible to food web exposures or are representative prey of organisms that are susceptible to food exposures (EPA 1993). They reflect a range of feeding guilds (e.g., invertivorous bird, carnivorous mammal) and thus a range of dietary exposures. Finally, dietary and toxicological information is available for these species, making them good candidate species for food web modeling.

Attachment 8 presents the calculations and assumptions used to derive the risk-based concentrations for these ROIs. This attachment includes the ecological toxicity reference values (and their sources), the food and soil ingestion rates for each receptor, the bioconcentration factors and exposure concentrations used in the food web modeling, and the calculations used to determine risk-based soil concentrations that would result in hazard quotients (HQs) no greater than 1 for each receptor. The lower (more stringent) of the values calculated for the two avian and two mammalian receptors are presented on Table 2.

For terrestrial invertebrates and plants, the risk-based concentrations are equal to the geometric mean of the chemical specific no observable adverse effect level (NOAEL)/no observable effect concentration (NOEC) and lowest observable effect level (LOAEL)/lowest observable effect concentration (LOEC) based ecological soil screening levels presented in the LANL (2017) EcoRisk Database, Release 4.1 for

Terraphase Engineering Inc. Page 4 of 3 earthworms (soil-dwelling invertebrates) and generic plants (terrestrial autotroph – producer), respectively. The resulting preliminary remedial goals for these receptors are presented on Table 2.

The ecological-based PRGs are the lowest of the values calculated for avian, mammalian, invertebrate and plant receptors, presented on Table 2.

5. Conclusion

Terraphase has prepared this technical memorandum to document the assumptions and methodologies used to derive PRGs which will be used to evaluate the post-cleanup confirmation soil sampling results following removal action associated with the Woolsey Fire TCRA.

Table 2 presents the PRGs which will be used. The overall PRGs which will be used are equal to the lower of the human health or ecological risk-based concentrations, unless they are lower than the BTV.

In such cases, the BTV will be used as the PRG.

6. References

Efroymson, R.A., B.E. Sample, and G.W. Suter II. 2001. Uptake of inorganic chemicals from soil by plant leaves: Regressions of field data. Environ. Toxicol. Chem. 20(11):2561-2571.

Jury, W.A, W.F. Spencer, and W.J. Farmer. 1983. Behavior Assessment Model for Trace Organics in Soil: I.

Model Description. J. Environ. Qual. 12(4):448‐64.

Los Alamos National Laboratory (LANL). 2017. EcoRisk Database, Release 4.1. October 19.

Sample, B.E., D.M. Opresko, and G.W. Suter II. 1996. Toxicological Benchmarks for Wildlife: 1996 Revisions. Prepared by the Risk Assessment Program, Health Sciences Research Division, Oak Ridge National Laboratory for the U.S. Department of Energy. ES/ER/TM-86/R3.

United States Environmental Protection Agency (EPA). 1991. Human health evaluation manual, supplemental guidance: "Standard default exposure factors." Memorandum from T. Fields, Jr., Office of Emergency Remedial Response, to B. Diamond, Office of Waste Programs Enforcement. OSWER Directive 9285.6-03. March 25.

United States Environmental Protection Agency (EPA). 1993. Wildlife Exposure Factors Handbook.

Volumes I and II. EPA/600/R-93/187. Office of Research and Development, Washington DC.

United States Environmental Protection Agency (EPA). 1996. Office of Solid Waste and Emergency Response (OSWER). Soil Screening Guidance: Technical Background Document, 2nd Ed.

EPA/540/R95/128. May.

United States Environmental Protection Agency (EPA). 1997a. Ecological Risk Assessment Guidance for Superfund. U.S. Environmental Protection Agency, Office of Solid Waste and Emergency Response.

EPA 540-R-97-006. OSWER 9285.7-25.

United States Environmental Protection Agency (EPA). 1997b. Office of Health and Environmental Assessment. Exposure Factors Handbook. Washington, DC. EPA/600/P-95/002Fa. August.

United States Environmental Protection Agency (EPA). 2002. Office of Solid Waste and Emergency Response. Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites.

Washington, DC. OSWER Directive 9355.4-24. December.

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United States Environmental Protection Agency (EPA). 2003a. Human Health Toxicity Values in Superfund Risk Assessments. OSWER Directive 9285.7-53. December.

United States Environmental Protection Agency (EPA). 2003b. Recommendations of the Technical Review Workgroup for Lead for an Approach to Assessing Risks Associated with Adult Exposures to Lead in Soil [Adult Lead Model (ALM)], EPA 540 R 030001. OSWER 9285.7 54. January.

United States Environmental Protection Agency (EPA). 2004. Office of Emergency and Remedial Response. Risk Assessment Guidance for Superfund, Volume 1: Human Health Evaluation Manual (Part E, Supplemental Guidance for Dermal Risk Assessment). USEPA/540/R/99/005. September.

United States Environmental Protection Agency (EPA). 2005. Guidance for Developing Ecological Soil Screening Levels. OSWER Directive 92857- 55. U.S. Environmental Protection Agency, Office of Solid Waste and Emergency Response, Washington, DC. March.

United States Environmental Protection Agency (EPA). 2009. Office of Emergency and Remedial Response. Risk Assessment Guidance for Superfund, Volume 1: Human Health Evaluation Manual (Part F, Supplemental Guidance for Inhalation Risk Assessment). USEPA/540/R/070/002. January.

United States Environmental Protection Agency (EPA). 2012. Recommendations for Default Value for Relative Bioavailability of Arsenic in Soil. December.

United States Environmental Protection Agency (EPA). 2014. Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. February 6.

United States Environmental Protection Agency (EPA). 2016. Transmittal of Update of the Adult Lead Methodology’s Default Baseline Blood Lead Concentration and Geometric Standard Deviation Parameters. Office of Solid Waste and Emergency Response, Washington, DC. OSWER 9285.6- 55.

August.

United States Environmental Protection Agency (EPA). 2019. Regional Screening Levels (RSLs).

November 19.

TABLES

Background Soil Sampling Results and Statistics Woolsey Fire Cleanup, Santa Monica Mountains National Recreation Area, California

Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Manganese Mercury Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ

AS‐BG‐01‐0.5 AS‐BG‐01 1.5 U 0.5 U 47.3 0.25 U 1.15 73.4 26.2 27.9 6.7 535 0.07 U 0.5 U 73.6 1.5 U 0.25 U 1.5 U 65.4 76.7 AS‐BG‐02‐0.5 AS‐BG‐02 3.94 0.5 U 61.8 0.25 U 1.08 24.3 26.5 9.43 540 0.07 U 0.5 U 80 1.5 U 0.25 U 1.5 U 52.3 90.3 AS‐BG‐03‐0.5 AS‐BG‐03 1.5 U 0.5 U 60.4 0.25 U 1.24 108 27.3 26.1 2.62 600 0.07 U 0.5 U 94.5 1.5 U 0.25 U 3.7 50.4 54.4 AS‐BG‐04‐0.5 AS‐BG‐04 1.5 U 0.5 U 73.4 0.25 U 1.2 95 29.8 25.8 111 790 0.07 U 0.5 U 89.3 1.5 U 0.25 U 1.5 U 46.6 88.4 AS‐BG‐05‐0.5 AS‐BG‐05 1.5 U 0.5 U 48.9 0.25 U 1.1 92.7 25.6 24 22.8 508 0.07 U 0.5 U 78.9 1.5 U 0.25 U 1.5 U 58.4 57.5 AS‐BG‐06‐0.5 AS‐BG‐06 1.5 U 0.5 U 54.8 0.25 U 0.91 82.6 22.5 22.3 2.42 502 0.07 U 0.5 U 79.8 3.25 0.25 U 1.5 U 47.6 45.4 AS‐BG‐07‐0.5 AS‐BG‐07 1.5 U 0.5 U 50.9 0.25 U 1.12 91.2 25.6 26.4 1.69 554 0.07 U 0.5 U 77.4 1.5 U 0.25 U 1.5 U 64.8 57.3 AS‐BG‐08‐0.5 AS‐BG‐08 1.5 U 0.5 U 63.8 0.25 U 0.97 23.1 20.2 7.68 536 0.07 U 0.5 U 64.4 1.5 U 0.25 U 1.5 U 49.8 46.7 AS‐BG‐09‐0.5 AS‐BG‐09 1.5 U 0.5 U 55.8 0.25 U 0.84 75.2 22.4 18.8 6.68 578 0.07 U 0.5 U 65 1.5 U 0.25 U 1.5 U 47.8 36.3 AS‐BG‐10‐0.5 AS‐BG‐10 1.5 U 2.76 61.8 0.25 U 1.65 80 23.1 26.8 7.38 549 0.17 0.5 U 87.1 1.5 U 0.25 U 1.5 U 58.9 53.4 AS‐BG‐11‐0.5 AS‐BG‐11 4.06 0.5 U 51.7 0.25 U 1.09 90.3 27 29 4.83 573 0.07 U 0.5 U 100 1.5 U 0.25 U 1.5 U 63.7 52.5 AS‐BG‐12‐0.5 AS‐BG‐12 1.5 U 1.28 57.4 0.25 U 1.02 78.7 25.3 26.2 16.4 738 0.07 U 0.5 U 83.1 1.5 U 0.25 U 1.5 U 56.1 64.9 AS‐BG‐13‐0.5 AS‐BG‐13 1.5 U 0.5 U 63.7 0.25 U 1.1 107 28.9 26.5 6.62 660 0.07 U 0.5 U 100 1.5 U 0.25 U 1.5 U 68.8 48.7 AS‐BG‐14‐0.5 AS‐BG‐14 1.5 U 0.5 U 54.1 0.25 U 1.01 100 25.7 23.8 4.97 609 0.07 U 0.5 U 87.7 1.5 U 0.25 U 1.5 U 65.2 45.4 AS‐BG‐15‐0.5 AS‐BG‐15 1.5 U 0.5 U 58.5 0.25 U 0.97 24.8 28.4 13.3 670 0.19 0.5 U 83.3 1.5 U 0.25 U 1.5 U 51.4 54.8 DP‐BG‐01‐0.5 DP‐BG‐01 1.5 U 1.08 45.1 0.25 U 2.28 84.2 17.2 15.4 6.15 440 0.07 U 3.43 49.4 1.5 U 0.25 U 1.5 U 79.2 78.6 DP‐BG‐02‐0.5 DP‐BG‐02 1.5 U 3.77 42.9 0.25 U 2.31 16.8 17 10.1 458 0.07 U 2.92 46.6 1.5 U 0.25 U 1.5 U 68.7 83.9 DP‐BG‐03‐0.5 DP‐BG‐03 1.5 U 1.92 43.7 0.25 U 1.96 55.6 10.6 13.8 12.4 386 0.07 U 2.99 29 1.5 U 0.25 U 1.5 U 55.4 110 DP‐BG‐04‐0.5 DP‐BG‐04 1.5 U 9.89 65.3 0.56 4.6 44.3 8.35 12.2 21.4 440 0.07 U 5.08 25.5 1.5 U 0.25 U 1.5 U 44.1 108 DP‐BG‐05‐0.5 DP‐BG‐05 1.5 U 0.5 U 28.3 0.25 U 2.12 74.1 16.3 11.8 5.3 295 0.07 U 1.84 47.8 1.5 U 0.25 U 1.5 U 61.1 50.2 DP‐BG‐06‐0.5 DP‐BG‐06 1.5 U 0.5 U 26.9 0.25 U 1.63 70.1 13.3 9.85 5.36 263 0.07 U 0.5 U 44 1.5 U 0.25 U 1.5 U 62.6 48.4 DP‐BG‐07‐0.5 DP‐BG‐07 1.5 U 0.5 U 39.2 0.25 U 4.57 131 24.7 10.4 3.24 571 0.07 U 2.1 81.7 1.5 U 0.25 U 1.5 U 95.2 60.8 DP‐BG‐08‐0.5 DP‐BG‐08 1.5 U 0.5 U 36.5 0.25 U 1.74 21.2 6.26 1.11 370 0.07 U 0.5 U 77.9 1.5 U 0.25 U 1.5 U 77 51.2 DP‐BG‐09‐0.5 DP‐BG‐09 1.5 U 0.5 U 27.7 0.25 U 1.53 102 19.2 8.4 1.81 293 0.07 U 0.5 U 66.1 1.5 U 0.25 U 1.5 U 67 46.4 DP‐BG‐10‐0.5 DP‐BG‐10 1.5 U 0.5 U 29.7 0.25 U 1.48 101 21.5 10.6 1.27 347 0.07 U 0.5 U 62.1 1.5 U 0.25 U 1.5 U 85.2 46.6 DP‐BG‐11‐0.5 DP‐BG‐11 1.5 U 0.5 U 24.8 0.25 U 1.24 117 20.8 8.33 2.64 281 0.07 U 0.5 U 73.6 1.5 U 0.25 U 1.5 U 67.9 45.8 DP‐BG‐12‐0.5 DP‐BG‐12 1.5 U 2.64 45.1 0.25 U 2.56 84.7 15.8 9.37 3.57 347 0.07 U 2.06 54.4 1.5 U 0.25 U 1.5 U 63.9 55.9 DP‐BG‐13‐0.5 DP‐BG‐13 1.5 U 0.5 U 25.4 0.25 U 1.47 90.7 20 8.31 3.67 560 0.07 U 0.5 U 55.2 1.5 U 0.25 U 1.5 U 68.8 43.5 DP‐BG‐14‐0.5 DP‐BG‐14 1.5 U 3.72 36.2 0.25 U 1.64 9.24 6.71 5.56 282 0.07 U 0.5 U 23.8 1.5 U 0.25 U 1.5 U 37 45.7 DP‐BG‐15‐0.5 DP‐BG‐15 1.5 U 5.53 41.1 0.25 U 2.38 25 7.55 10.7 7.4 254 0.07 U 0.5 U 18.4 1.5 U 0.25 U 1.5 U 36.1 60.8 MR‐BG‐01‐0.5 MR‐BG‐01 3.63 0.5 U 103 0.25 U 2.95 13.4 3.56 14.5 15 211 0.07 U 0.5 U 13.5 1.5 U 0.25 U 1.5 U 22.3 108 MR‐BG‐02‐0.5 MR‐BG‐02 6.1 0.5 U 125 0.25 U 5.05 16.7 4.26 13.7 12.9 257 0.07 U 3.87 17.8 1.5 U 0.25 U 1.5 U 35.2 314 MR‐BG‐03‐0.5 MR‐BG‐03 1.5 U 0.5 U 114 0.25 U 4.01 16.2 3.91 13.6 8.05 242 0.07 U 2.7 17.1 1.5 U 0.25 U 1.5 U 31.4 64.2 MR‐BG‐04‐0.5 MR‐BG‐04 1.5 U 0.5 U 94.2 0.25 U 2.4 3.4 10.4 20.1 181 0.07 U 1.62 12.3 1.5 U 0.25 U 1.5 U 24 64.4 MR‐BG‐05‐0.5 MR‐BG‐05 1.5 U 0.5 U 110 0.25 U 2.7 16.2 4.02 11.6 9.86 240 0.07 U 2.56 16.8 1.5 U 0.25 U 1.5 U 29 48.8 MR‐BG‐06‐0.5 MR‐BG‐06 1.5 U 0.5 U 101 0.25 U 2.43 16 3.85 12.5 9.01 218 0.07 U 2 17.1 1.5 U 0.25 U 1.5 U 28.6 49.6 MR‐BG‐07‐0.5 MR‐BG‐07 1.5 U 0.5 U 96.4 0.25 U 2.4 15.7 3.85 11.6 7.88 210 0.07 U 2.74 15.9 1.5 U 0.25 U 1.5 U 27.1 53.4 MR‐BG‐08‐0.5 MR‐BG‐08 4.96 0.5 U 95.3 0.25 U 2.17 3.48 10.3 19.5 222 0.07 U 1.74 13.7 1.5 U 0.25 U 1.5 U 24.1 65.9 MR‐BG‐09‐0.5 MR‐BG‐09 1.5 U 0.5 U 115 0.25 U 2.58 14.2 3.22 11.9 13.2 192 0.07 U 1.58 13.7 1.5 U 0.25 U 1.5 U 26.5 124 MR‐BG‐10‐0.5 MR‐BG‐10 1.5 U 1.46 121 0.25 U 2.33 18.7 5.09 14.1 29.3 567 0.07 U 1.69 19.6 1.5 U 0.25 U 1.5 U 34.1 125 MR‐BG‐11‐0.5 MR‐BG‐11 1.5 U 0.5 U 128 0.25 U 2.92 24 5.37 22.9 31.5 314 0.07 U 2.24 23.3 1.5 U 0.25 U 1.5 U 34.2 82.5 MR‐BG‐12‐0.5 MR‐BG‐12 1.5 U 0.5 U 102 0.25 U 2.13 4.83 12.4 12 282 0.07 U 1.41 17.1 1.5 U 0.25 U 1.5 U 31.6 55.7 MR‐BG‐13‐0.5 MR‐BG‐13 1.5 U 0.5 U 117 0.25 U 2.62 19.5 4.61 13 8.72 240 0.07 U 3.84 21.2 1.5 U 0.25 U 1.5 U 42.7 61.3 MR‐BG‐14‐0.5 MR‐BG‐14 1.5 U 0.5 U 99.9 0.25 U 2.28 16 3.65 10.9 9.42 198 0.07 U 1.78 16.8 1.5 U 0.25 U 1.5 U 31.9 46 MR‐BG‐15‐0.5 MR‐BG‐15 1.5 U 0.5 U 137 0.25 U 1.99 12.7 3.46 13.3 12 206 0.07 U 1.84 13.1 1.5 U 0.25 U 1.5 U 28.3 50.3 PR‐BG‐01‐0.5 PR‐BG‐01 1.5 U 4.05 64.7 0.25 U 2.54 31.9 9.77 34.2 14.3 204 0.07 U 2.27 31.8 1.5 U 0.25 U 1.5 U 41.2 76.2 PR‐BG‐02‐0.5 PR‐BG‐02 1.5 U 4.8 61.3 0.25 U 2.34 28 10.6 11.7 10.8 275 0.07 U 1.9 37.6 1.5 U 0.25 U 1.5 U 40 63.4 PR‐BG‐03‐0.5 PR‐BG‐03 1.5 U 5.24 65.5 0.25 U 2.4 9.97 15.5 9.78 336 0.07 U 1.49 33.2 1.5 U 0.25 U 1.5 U 41.6 62 PR‐BG‐04‐0.5 PR‐BG‐04 1.5 U 4.11 60.5 0.25 U 2.92 28 7.9 12.6 6.75 224 0.07 U 1.54 28.7 1.5 U 0.25 U 1.5 U 39.9 57.5 PR‐BG‐05‐0.5 PR‐BG‐05 1.5 U 4.97 77.3 0.25 U 2.72 31.9 10.3 21.3 13.8 312 0.07 U 1.28 33.7 1.5 U 0.25 U 1.5 U 44.6 61.4 PR‐BG‐06‐0.5 PR‐BG‐06 1.5 U 4.05 58.6 0.25 U 2.29 40.3 13.7 21.1 13.6 436 0.07 U 1.37 34.6 1.5 U 0.25 U 1.5 U 53.6 60 PR‐BG‐07‐0.5 PR‐BG‐07 1.5 U 4.92 81.4 0.25 U 3.66 11.3 30.1 17.2 394 0.07 U 1.73 37.6 1.5 U 0.25 U 1.5 U 55.7 69.4 PR‐BG‐08‐0.5 PR‐BG‐08 1.5 U 4.17 71.7 0.25 U 2.75 27.1 8.81 22.5 14.6 283 0.07 U 1.25 29.8 1.5 U 0.25 U 1.5 U 42.9 62.2 PR‐BG‐09‐0.5 PR‐BG‐09 1.5 U 2.97 76.9 0.25 U 3.01 33.8 11 25.6 15.5 381 0.07 U 1.39 36 1.5 U 0.25 U 1.5 U 48 69.4 PR‐BG‐10‐0.5 PR‐BG‐10 1.5 U 1.91 68.3 0.25 U 1.54 39.7 14.4 19.2 12.9 538 0.07 U 1.04 45.2 1.5 U 0.25 U 1.5 U 40.2 56.8 PR‐BG‐11‐0.5 PR‐BG‐11 1.5 U 1.76 83.3 0.25 U 2.92 30.8 10.7 22.9 15.8 361 0.07 U 2.7 32.8 1.5 U 0.25 U 1.5 U 46.7 61.4 PR‐BG‐12‐0.5 PR‐BG‐12 1.5 U 3.93 91.2 0.25 U 3.21 14.6 28.1 17 463 0.07 U 2.21 45.5 1.5 U 0.25 U 1.5 U 51 66.2 PR‐BG‐13‐0.5 PR‐BG‐13 3.17 0.5 U 41 0.25 U 1.2 25.3 6.68 10.5 6.57 213 0.07 U 0.5 U 23 1.5 U 0.25 U 1.5 U 25.7 45.9 PR‐BG‐14‐0.5 PR‐BG‐14 1.5 U 2.38 63.6 0.25 U 1.47 54.8 15.5 21.9 16.8 401 0.07 U 0.5 U 47.4 1.5 U 0.25 U 1.5 U 44.6 56.3 PR‐BG‐15‐0.5 PR‐BG‐15 1.5 U 2.89 57.1 0.25 U 2 25.8 8.54 13.5 11.4 284 0.07 U 2.03 26.6 1.5 U 0.25 U 1.5 U 34 59.7

Sample ID Location ID

Page 1 of 2 Terraphase Engineering Inc.

Background Soil Sampling Results and Statistics Woolsey Fire Cleanup, Santa Monica Mountains National Recreation Area, California

Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Manganese Mercury Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQ mg/kg VQSample ID Location ID

PS‐BG‐01‐0.5 PS‐BG‐01 3.24 0.5 U 44.9 0.25 U 1.28 64.4 19.4 21.8 22.5 433 0.07 U 0.5 U 57 1.5 U 0.25 U 1.5 U 56.5 79.3 PS‐BG‐02‐0.5 PS‐BG‐02 1.5 U 0.5 U 39.4 0.25 U 1.2 73.2 20.5 21.1 14.5 471 0.07 U 0.5 U 65.1 1.5 U 0.25 U 1.5 U 56.4 73.9 PS‐BG‐03‐0.5 PS‐BG‐03 1.5 U 1.04 53 0.25 U 1.25 17 18.6 19 432 0.07 U 0.5 U 51.2 1.5 U 0.25 U 1.5 U 49.2 82.4 PS‐BG‐04‐0.5 PS‐BG‐04 3.01 0.5 U 57.1 0.25 U 1.08 43.3 15.1 15 12.4 323 0.07 U 0.5 U 39.2 1.5 U 0.25 U 1.5 U 41.5 81.2 PS‐BG‐05‐0.5 PS‐BG‐05 1.5 U 0.5 U 61.8 0.25 U 1.32 82.1 22.3 20.9 28.8 534 0.07 U 0.5 U 65 1.5 U 0.25 U 1.5 U 59.4 79.3 PS‐BG‐06‐0.5 PS‐BG‐06 1.5 U 0.5 U 37.6 0.25 U 1 49.7 14.3 19.5 47.1 424 0.07 U 0.5 U 40.9 1.5 U 0.25 U 1.5 U 40.2 79.1 PS‐BG‐07‐0.5 PS‐BG‐07 1.5 U 0.5 U 53.9 0.25 U 1.15 19 19.3 12.4 592 0.07 U 0.5 U 57.4 1.5 U 0.25 U 1.5 U 52.7 60.2 PS‐BG‐08‐0.5 PS‐BG‐08 1.5 U 0.5 U 50.4 0.25 U 0.89 47.8 16.9 17.6 15.8 484 0.16 0.5 U 47.4 1.5 U 0.25 U 1.5 U 38.9 67.7 PS‐BG‐09‐0.5 PS‐BG‐09 1.5 U 2.84 54.7 0.25 U 1.29 48.5 18.1 20.6 25.3 568 0.63 0.5 U 43.4 1.5 U 0.25 U 1.5 U 56.9 90 PS‐BG‐10‐0.5 PS‐BG‐10 1.5 U 0.5 U 50.3 0.25 U 1.24 63.4 18.3 25.3 24.5 494 0.15 0.5 U 52.6 1.5 U 0.25 U 1.5 U 50.8 87.6 PS‐BG‐11‐0.5 PS‐BG‐11 1.5 U 1.15 58.6 0.25 U 1.07 54.5 17.8 20.1 14.1 482 0.4 0.5 U 48.4 1.5 U 0.25 U 1.5 U 53.8 64.5 PS‐BG‐12‐0.5 PS‐BG‐12 1.5 U 0.5 U 58.5 0.25 U 1.43 77.9 21.8 27.6 16 484 0.07 U 0.5 U 63.9 1.5 U 0.25 U 1.5 U 62.1 83.4 PS‐BG‐13‐0.5 PS‐BG‐13 1.5 U 2.64 61.5 0.25 U 1.64 22.7 31.3 25.1 502 0.14 0.5 U 66.2 1.5 U 0.25 U 1.5 U 64.8 105 PS‐BG‐14‐0.5 PS‐BG‐14 1.5 U 0.5 U 50.4 0.25 U 1.32 71.1 20.1 28.8 18.2 392 0.07 U 0.5 U 61.9 1.5 U 0.25 U 1.5 U 52.5 84.5 PS‐BG‐15‐0.5 PS‐BG‐15 1.5 U 2.18 58.5 0.25 U 1.46 55 20.5 25.5 35.8 413 0.07 U 0.5 U 40.4 1.5 U 0.25 U 1.5 U 52.8 103 RO‐BG‐01‐0.5 RO‐BG‐01 6.23 0.5 U 44.6 0.25 U 0.55 66.6 16.4 17.7 3.58 330 0.07 U 0.5 U 41 1.5 U 0.25 U 1.5 U 47 37.4 RO‐BG‐02‐0.5 RO‐BG‐02 1.5 U 0.5 U 29 0.25 U 0.25 U 6.52 9.96 7.41 136 0.07 U 0.5 U 19.1 1.5 U 0.25 U 1.5 U 31.7 100 RO‐BG‐03‐0.5 RO‐BG‐03 1.5 U 0.5 U 21.9 0.25 U 0.51 41.5 10.4 15 6.32 299 0.07 U 0.5 U 26.1 1.5 U 0.25 U 1.5 U 44.3 136 RO‐BG‐04‐0.5 RO‐BG‐04 1.5 U 0.5 U 61.2 0.25 U 0.57 57.4 13.5 19.9 11.3 382 0.07 U 0.5 U 39.8 1.5 U 0.25 U 1.5 U 29.2 96.9 RO‐BG‐05‐0.5 RO‐BG‐05 1.5 U 0.5 U 38.2 0.25 U 0.68 70 15.8 19.7 6.45 314 0.07 U 0.5 U 45.3 1.5 U 0.25 U 1.5 U 52.5 61.1 RO‐BG‐06‐0.5 RO‐BG‐06 1.5 U 1.64 36.5 0.25 U 0.64 81.9 16.4 24.7 4.72 434 0.07 U 0.5 U 52.8 1.5 U 0.25 U 1.5 U 45.6 45.6 RO‐BG‐07‐0.5 RO‐BG‐07 1.5 U 0.5 U 85.2 0.25 U 0.75 15.1 17.2 22 564 0.07 U 0.5 U 48.1 1.5 U 0.25 U 1.5 U 38.6 49.9 RO‐BG‐08‐0.5 RO‐BG‐08 1.5 U 0.5 U 67.9 0.25 U 0.75 89.1 16.6 22.7 11.8 459 0.07 U 0.5 U 56.3 1.5 U 0.25 U 1.5 U 44.1 54.6 RO‐BG‐09‐0.5 RO‐BG‐09 1.5 U 0.5 U 37.3 0.25 U 0.67 82.4 17.8 30.4 8.19 403 0.07 U 0.5 U 54.4 1.5 U 0.25 U 1.5 U 50.5 48.3 RO‐BG‐10‐0.5 RO‐BG‐10 1.5 U 0.5 U 59.5 0.25 U 1.32 118 35.7 41.9 5.08 920 0.07 U 0.5 U 69.5 1.5 U 0.25 U 1.5 U 80.6 67.8 RO‐BG‐11‐0.5 RO‐BG‐11 1.5 U 0.5 U 49.5 0.25 U 1.34 87.3 19.5 21.3 6.56 428 0.15 0.5 U 66.3 1.5 U 0.25 U 1.5 U 60 50.9 RO‐BG‐12‐0.5 RO‐BG‐12 1.5 U 0.5 U 41.2 0.25 U 1.49 89.3 22 24.9 6.74 494 0.07 U 0.5 U 79.2 1.5 U 0.25 U 1.5 U 61.7 48 RO‐BG‐13‐0.5 RO‐BG‐13 1.5 U 0.5 U 186 0.25 U 0.67 94.4 17 30.4 3.08 449 0.07 U 0.5 U 66.9 1.5 U 0.25 U 1.5 U 48.8 36.4 RO‐BG‐14‐0.5 RO‐BG‐14 1.5 U 0.5 U 33.5 0.25 U 0.69 18.3 21.7 15.6 383 0.07 U 0.5 U 73.9 1.5 U 0.25 U 1.5 U 50.3 64.4 RO‐BG‐15‐0.5 RO‐BG‐15 1.5 U 0.5 U 33.6 0.25 U 0.25 U 96.3 16 11.6 4.69 206 0.07 U 0.5 U 68.7 1.5 U 0.25 U 1.5 U 52 61.2

Count 90 90 90 90 90 72 90 90 90 90 90 90 90 90 90 90 90 90 Detected 9 30 90 1 88 72 90 90 90 90 8 34 90 1 0 1 90 90 Minimum 1.5 0.5 22 0.25 0.3 13 3.2 6.3 1.1 136.0 0.07 0.5 12 1.5 0.25 1.5 22 36 Median 1.5 0.5 59 0.25 1.5 64 16 19 11 402 0.07 0.5 47 1.5 0.25 1.5 50 61

Maximum 6.2 9.9 186 0.56 5.1 131 36 42 111 920 0.63 5.1 100 3.3 0.25 3.7 95 314 Arithmetic mean 1.8 1.4 64 0.25 1.8 60 15 19 13 407 0.09 1.1 49 1.5 0.25 1.5 49 69

Standard deviation 0.9 1.7 29 0.03 1.0 32 7.6 7.3 13 152 0.07 1.0 24 0.2 0.00 0.2 15 33 UCL on Mean 3.2 2.0 69 ‐‐ 2.0 77 17 20 15 434 0.18 1.6 53 ‐‐ ‐‐ 3.7 52 75

BG Threshold Value (BTV) 4.1 4.6 134 0.56 4.6 118 30 31 45 702 0.40 3.8 95 3.3 ‐‐ 3.7 78 131

Notes:

Concentrations for nondetects (U‐qualified data) are 0.5 the analytical limits.

Page 2 of 2 Terraphase Engineering Inc.

Background Overall

Background Threshold Value (mg/kg)

Park Resident (mg/kg)

Park Employee (mg/kg)

Maintenance Worker (mg/kg)

Construction Worker (mg/kg)

Park Visitor (mg/kg)

Human Health‐Based Preliminary

Remedial Goal (mg/kg)

Terrestrial Plants (mg/kg)

Terrestrial Invertebrates

(mg/kg) Mammals (mg/kg)

Birds (mg/kg)

Ecological‐ Based

Preliminary Remedial Goal

(mg/kg)

Overall Proposed Preliminary

Remedial Goal (mg/kg)

PCBs (total) 1336‐36‐3 ‐‐ 2.2E‐01 1.3E+01 1.8E+01 1.1E+01 7.6E+01 2.2E‐01 3.1E+02 ‐‐ 9.0E‐02 3.9E‐01 9.0E‐02 9.0E‐02 Antimony 7440‐36‐0 4.1E+00 1.0E+02 9.3E+03 3.9E+03 2.3E+02 2.2E+04 1.0E+02 2.5E+01 2.5E+02 1.1E+01 ‐‐ 1.1E+01 1.1E+01 Arsenic 7440‐38‐2 4.6E+00 6.8E‐01 5.1E+01 5.9E+01 4.0E+01 2.9E+02 6.8E‐01 4.0E+01 2.2E+01 1.7E+02 1.3E+02 2.2E+01 4.6E+00 Barium 7440‐39‐3 1.3E+02 5.2E+04 1.0E+06 1.0E+06 1.2E+05 1.0E+06 5.2E+04 1.7E+02 1.0E+03 3.6E+03 ‐‐ 1.7E+02 1.7E+02 Beryllium 7440‐41‐7 5.6E‐01 5.2E+02 4.7E+04 2.1E+03 7.0E+02 1.1E+05 5.2E+02 7.9E+00 1.3E+02 2.5E+01 ‐‐ 7.9E+00 7.9E+00 Cadmium 7440‐43‐9 4.6E+00 2.3E+02 1.7E+04 2.8E+03 5.3E+02 3.9E+04 2.3E+02 7.2E+01 3.3E+02 8.3E+00 4.7E+00 4.7E+00 4.7E+00 Chromium III 16065‐83‐1 1.2E+02 3.9E+05 1.0E+06 1.0E+06 2.9E+05 1.0E+06 2.9E+05 ‐‐ ‐‐ 3.4E+02 1.0E+02 1.0E+02 1.2E+02 Chromium VI 18540‐29‐9 ‐‐ 1.4E+00 1.3E+02 1.0E+02 7.0E+01 7.6E+02 1.4E+00 1.2E+00 1.1E+00 7.3E+02 1.0E+02 1.1E+00 1.1E+00 Cobalt 7440‐48‐4 3.0E+01 7.7E+01 7.0E+03 5.7E+02 6.8E+02 1.6E+04 7.7E+01 4.1E+01 ‐‐ 7.0E+02 3.9E+02 4.1E+01 4.1E+01 Copper 7440‐50‐8 3.1E+01 1.0E+04 9.3E+05 3.9E+05 2.3E+04 1.0E+06 1.0E+04 1.9E+02 2.1E+02 5.5E+02 1.4E+02 1.4E+02 1.4E+02 Lead 7439‐92‐1 4.5E+01 4.0E+02 2.5E+03 2.5E+03 2.5E+03 4.0E+02 4.0E+02 2.6E+02 3.8E+03 1.4E+03 1.8E+02 1.8E+02 1.8E+02 Manganese 7439‐96‐5 7.0E+02 3.6E+04 1.0E+06 3.6E+04 4.2E+03 1.0E+06 4.2E+03 4.9E+02 1.4E+03 5.7E+03 1.1E+04 4.9E+02 7.0E+02 Mercury 7439‐97‐6 4.0E‐01 1.8E+01 8.4E+02 4.3E+02 1.9E+01 3.8E+03 1.8E+01 4.7E+01 5.5E+00 2.4E+00 3.1E‐01 3.1E‐01 4.0E‐01 Molybdenum 7439‐98‐7 3.8E+00 1.3E+03 1.2E+05 4.9E+04 2.9E+03 2.7E+05 1.3E+03 ‐‐ ‐‐ 1.6E+01 1.2E+02 1.6E+01 1.6E+01 Nickel 7440‐02‐0 9.5E+01 5.2E+03 4.7E+05 2.1E+04 7.0E+03 1.0E+06 5.2E+03 1.0E+02 6.0E+02 1.1E+02 1.1E+02 1.0E+02 1.0E+02 Selenium 7782‐49‐2 3.3E+00 1.3E+03 1.2E+05 4.9E+04 2.9E+03 2.7E+05 1.3E+03 1.2E+00 1.3E+01 4.9E+00 4.9E+00 1.2E+00 3.3E+00 Silver 7440‐22‐4 ‐‐ 1.3E+03 1.2E+05 6.3E+03 6.7E+02 2.7E+05 6.7E+02 1.3E+03 ‐‐ 2.5E+02 4.2E+01 4.2E+01 4.2E+01 Thallium 7440‐28‐0 3.7E+00 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ 1.6E‐01 ‐‐ 1.8E+00 4.8E+01 1.6E‐01 3.7E+00 Vanadium 7440‐62‐2 7.8E+01 1.3E+03 1.2E+05 2.9E+04 3.5E+03 2.7E+05 1.3E+03 6.9E+01 ‐‐ 5.2E+02 3.8E+01 3.8E+01 3.8E+01 Zinc 7440‐66‐6 1.3E+02 7.7E+04 1.0E+06 1.0E+06 1.8E+05 1.0E+06 7.7E+04 3.6E+02 1.1E+03 5.3E+03 7.4E+02 3.6E+02 3.6E+02 2,3,7,8‐Tetrachlorodibenzo‐p‐dioxin 1746‐01‐6 ‐‐ 4.8E‐06 3.7E‐04 4.4E‐04 2.7E‐04 2.2E‐03 4.8E‐06 ‐‐ ‐‐ 3.0E‐06 ‐‐ 3.0E‐06 3.0E‐06

Asbestos Asbestos 1332‐21‐4 ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐ ‐‐

Notes:

The overall preliminary remediation goal (PRG) is equal to the lower of the human health or ecological risk‐based concentrations, unless lower than the background threshold value (BTV). BTVs were used as the PRG in such cases.

‐‐ No value calculated either because of inadequate information regarding human or ecological toxicity, because they are not bioaccumulating, or because of inadequate information regarding bioconcentration.

With the exception of lead, risk‐based concentrations for human receptors are based upon the use of high‐end exposure factors, a target cancer risk of 10‐6, and a target noncancer hazard quotient of 1.

For lead, risk‐based concentrations for park resident and park visitor receptors are equal to USEPA Regional Screening Level for residential soil.

For lead, a screening level for non‐residential receptors was calculated following USEPA guidance for the adult lead model (USEPA 2003), including updates (USEPA 2016).

Risk‐based concentrations for ecological mammal and bird (avian) receptors are based upon conservative food‐web modeling considering the following receptors which are known to be present at the Site and representative of a range of feeding guilds:

‐ American Robin (Bird, Herbivore/Invertivore) ‐ Red‐tailed Hawk (Bird, Top Level Carnivore) ‐ Deer Mouse (Mammal, Herbivore/Invertivore) ‐ Red Fox (Mammal, Top Level Carnivore)

Risk‐based concentrations for terrestrial plants and invertegbrates are equal to the geological mean of the NOAEL and LOAEL‐based ecological soil screening levels from the LANL (2017) EcoRisk Database Release 4.1.

Risk‐based concentrations calculated mathematically to be greater than 1,000,000 mg/kg are capped at that concentation.

Risk‐Based Concentrations for Ecological Receptors

Table 2 Human Health and Ecological Remedial Goals Woolsey Fire Cleanup Santa Monica Mountains National Recreation Area, California

PCBs

CASRN

Dioxins/Furans

Chem Group Chemical

Metals

Risk‐Based Concentrations for Human Receptors

Terraphase Engineering, Inc. Page: 1 of 1

ATTACHMENT 1

TOXICITY VALUES, PHYSICAL AND CHEMICAL PROPERTIES AND

EXPOSURE FACTORS

• Table 1: Toxicity Values

• Table 2: Physical and Chemical Properties

• Table 3: High-End Exposure Factors

Cancer Classification

ADAF SForal (mg/kg/d)‐1 SFdermal (mg/kg/d)‐1 URF (mg/m3)‐1 RfDoral (mg/kg/d) RfDdermal (mg/kg/d) RfC (mg/m3) SRfDoral (mg/kg/d) SRfDdermal (mg/kg/d) SRfC (mg/m3)

Group Ref Y/N Value Ref Notes Value Ref Notes Value Ref Notes Value UF Ref Notes Value UF Ref Notes Value UF Ref Notes Value UF Ref Notes Value UF Ref Notes Value UF Ref Notes PCB PCBs (total) 1336‐36‐3 B2 1 N 2.0E+00 1 30,32 2.0E+00 125 104 5.7E‐01 1 30,32, 45 2.0E‐05 300 1 72 2.0E‐05 300 125 104 5.0E‐05 100 1 110, 72 5.0E‐05 100 125 104

INORG Antimony 7440‐36‐0 ID 126 N 4.0E‐04 1,000 1 6.0E‐05 1,000 125 104 126 90 4.0E‐04 1,000 126 6.0E‐05 1000 125 104 126 90 INORG Arsenic 7440‐38‐2 A 1 N 1.5E+00 1 1.5E+00 125 104 4.3E+00 1 3.0E‐04 3 1 3.0E‐04 3 125 104 1.5E‐05 131 5.0E‐03 10 100 5.0E‐03 10 125 104 1.5E‐05 131 62 INORG Barium 7440‐39‐3 NC 1 N 2.0E‐01 300 1 1.4E‐02 300 125 104 1 90 2.0E‐01 300 129 111, 163 1.4E‐02 300 125 104 1 90, 62 INORG Beryllium 7440‐41‐7 B1 1 N 2.4E+00 1 2.0E‐03 300 1 1.4E‐05 300 125 104 2.0E‐05 10 1 2.0E‐03 300 1 62 1.4E‐05 300 125 104 2.0E‐05 10 1 62 INORG Cadmium 7440‐43‐9 B1 1 N 1.8E+00 1 1.0E‐03 10 1 95 2.5E‐05 10 125 104 1.0E‐05 9 129 111 1.0E‐03 10 1 95, 62 2.5E‐05 10 125 104 9.0E‐04 122 102 INORG Chromium (total) 7440‐47‐3 N 5.0E‐01 141 8 2.0E+01 125 104 1.2E+01 1 8 3.0E‐03 900 1 8 7.5E‐05 900 125 104 1.0E‐04 300 1 59, 8 5.0E‐03 100 129 111, 8 1.3E‐04 100 125 104 1.0E‐03 30 1 110, 8 INORG Chromium III 16065‐83‐1 D 1 N 1.5E+00 1,000 1 2.0E‐02 1,000 125 104 5.0E‐03 90 129 11, 166, 11 1.5E+00 1,000 1 62 2.0E‐02 1000 125 104 5.0E‐03 90 129 111, 166 INORG Chromium VI 18540‐29‐9 A 1 N 5.0E‐01 141 2.0E+01 125 104 1.2E+01 1 3.0E‐03 900 1 7.5E‐05 900 125 104 1.0E‐04 300 1 59 5.0E‐03 100 129 111 1.3E‐04 100 125 104 1.0E‐03 30 1 110 INORG Cobalt 7440‐48‐4 LC 126 N 9.0E+00 126 140 3.0E‐04 3,000 126 3.0E‐04 3,000 125 104 6.0E‐06 300 126 3.0E‐03 300 126 3.0E‐03 300 125 104 2.0E‐05 100 126 INORG Copper 7440‐50‐8 D 1 N 4.0E‐02 2 50 49 4.0E‐02 2 125 104 4.0E‐02 2 50 49, 62 4.0E‐02 2 125 104 INORG Lead 7439‐92‐1 B2 1 N INORG Manganese 7439‐96‐5 D 1 N 1.4E‐01 1 1 8.4E‐03 1 125 104 5.0E‐05 1,000 1 1.4E‐01 1 1 62 8.4E‐03 1 125 104 5.0E‐05 1,000 1 62 INORG Mercury 7439‐97‐6 D 1 N 3.0E‐04 1,000 1 51 2.1E‐05 1,000 125 104 3.0E‐04 30 1 3.0E‐03 100 1 110, 51 2.1E‐04 100 125 104 3.0E‐04 30 2 INORG Molybdenum 7439‐98‐7 N 5.0E‐03 30 1 5.0E‐03 30 125 104 5.0E‐03 30 2 5.0E‐03 30 125 104 INORG Nickel 7440‐02‐0 A 1 N 2.4E‐01 1 2.0E‐02 300 1 8.0E‐04 300 125 104 9.0E‐05 30 129 111 2.0E‐02 300 2 2 8.0E‐04 300 125 104 2.0E‐04 30 129 111 INORG Selenium 7782‐49‐2 D 1 N 5.0E‐03 3 1 5.0E‐03 3 125 104 2.0E‐02 131 5.0E‐03 3 2 2 5.0E‐03 3 125 104 2.0E‐02 131 62 INORG Silver 7440‐22‐4 D 1 N 5.0E‐03 3 1 2.0E‐04 3 125 104 1.0E‐05 1,000 83 5.0E‐03 3 2 2 2.0E‐04 3 125 104 1.0E‐05 1,000 83 62 INORG Thallium 7440‐28‐0 ID 126 N 1 90 125 104 126 90 1 90 125 104 126 90 INORG Vanadium 7440‐62‐2 ID 1 N 5.0E‐03 100 1 154 1.3E‐04 100 125 104 1.0E‐04 30 129 111 1.0E‐02 10 129 111 2.6E‐04 10 125 104 1.0E‐04 30 129 111, 62 INORG Zinc 7440‐66‐6 ID 1 N 3.0E‐01 3 1 3.0E‐01 3 125 104 3.0E‐01 3 129 111 3.0E‐01 3 125 104 CDDF 2,3,7,8‐Tetrachlorodibenzo‐p‐dioxin (TEQ) 1746‐01‐6‐TEQ B2 2 N 1.3E+05 136 1.3E+05 125 104 3.8E+04 136 7.0E‐10 30 1 7.0E‐10 30 125 104 4.0E‐08 131 138, 139 2.0E‐08 30 129 111 2.0E‐08 30 125 104 4.0E‐08 131 138, 139, 62

References 1 USEPA. Integrated Risk Information System (IRIS). On‐line database.

2 USEPA. 1997. Health Effects Assessment Summary Tables (HEAST). FY‐1997 Update. EPA 540/R‐97‐036. July.

50 USEPA. 56 FR 26460, June 7, 1991. Maximum Contaminant Level Goals and National Primary Drinking Water Regulations for Lead and Copper. Final Rule.

83 USEPA. NCEA. 1994. Risk Assessment Issue Paper for: Derivation of a Provisional RfC for Silver [CASRN 7440‐22‐4]. June 30.

100 USEPA. Region 8. 2002. Derivation of Acute and Subchronic Oral Reference Doses for Inorganic Arsenic. August.

122 USEPA. NCEA. 1998. Risk Assessment Issue Paper for: Derivation of Provisional Subchronic RfC for Cadmium [CASRN 7440‐43‐9]. June 14.

125 USEPA. 2004. Risk Assessment Guidance for Superfund Volume I: Human Health Evaluation Manual (Part E, Supplemental Guidance for Dermal Risk Assessment) Final. July.

126 Provisional Peer Reviewed Toxicity Values for Superfund (PPRTV) Database.

129 ATSDR. 2018. Minimal Risk Levels. June.

131 CalEPA. ARB. 2014. Consolidated Table of OEHHA/ARB Approved Risk Assessment Health Values. July 3.

136 CalEPA. OEHHA. Toxicity Criteria Database. http://www.oehha.ca.gov/risk/ChemicalDB/index.asp 141 NJDEP. 2009. Derivation of Ingestion‐Based Soil Remediation Criteria for Cr+6 Based on the NTP Chronic Bioassay Data for Sodium Dichromate Dihydrate. April.

Notes:

2 USEPA adopted chronic value as subchronic value.

8 Used Chromium VI [CASRN 18540‐29‐9] value from the indicated reference as a surrogate.

30 Upper‐bound slope factor.

32 High risk & persistence tier for: food chain exposure; sediment/soil ingestion; dust/aerosol inhalation; dermal exposure, if an absorption factor is applied; presence of dioxin‐like, tumor‐promoting/persistent congeners; and all early life exposures.

45 Terraphase derived inhalation URF from Inhalation Slope Factor value presented in the indicated reference, using standard USEPA methodology presented in HEAST.

49 Terraphase derived oral RfD from adverse health effect level value presented in the indicated reference.

51 Terraphase used Mercuric Chloride [CASRN 7487‐94‐7] value from the indicated reference as a surrogate.

59 This RfC is for particulates. The RfC for chromic acid mists and dissolved Chromium VI aerosols is 0.000008 mg/m3.

62 Terraphase used chronic value as a surrogate for the subchronic value.

72 Terraphase used Aroclor 1254 [CASRN 11097‐69‐1] value from the indicated reference as a surrogate for PCBs [CASRN 1336‐36‐3].

77 IRIS provides an alternate slope factor of 5E‐2; however, USEPA does not recommend its use, due to the higher uncertainty in the delivered dose in the supporting study.

90 Inadequate data exist to derive a toxicity value, according to the indicated reference.

95 This RfD is used to evaluate dietary exposures. A RfD of 0.0005 mg/kg/day is used to evaluate water ingestion exposures.

102 USEPA applied a dose equivalency factor of 4.5 to the chronic RfC to derive the subchronic RfC.

104 Dermal toxicity value is extrapolated from oral toxicity value in accordance with the referenced USEPA guidance.

110 The value is based on discussion in the indicated reference regarding the principal study USEPA used in extrapolating from subchronic to chronic.

111 Value as published is an MRL in the indicated reference.

116 Terraphase used subchronic value as a surrogate for the chronic value.

138 See cited source for additional details.

139 Values calculated using the WHO (1997) TEF procedure.

140 Value based on cobalt sulfate (soluble).

154 The oral RfD for vanadium is derived from the IRIS oral RfD for vanadium pentoxide by factoring out the molecular weight of the oxide ion.

163 This MRL is for soluble salts.

166 This MRL is for insoluble particulates.

Attachment 1 Table 1: Toxicity Values Woolsey Fire Time Critical Response Action, Santa Monica National Recreation Area

Chem Group

Chemical CASRN

Page: 1 of 1 Terraphase Engineering, Inc.

MW (g/mole) Kow (unitless) Koc (L/kg) Kd (L/kg) H (unitless) s (mg/L) VP (mm Hg) Dair (m 2/d) Dwater (m

2/d) Kp (cm/hr) ABSd (unitless) FA (unitless)

Value Ref Notes Value Ref Notes Value Ref Notes Value Ref Notes Value Adjust Ref Notes Value Ref Notes Value Adjust Ref Notes Value Ref Notes Value Ref Notes Value Ref Notes Value Ref Notes Value Ref Notes PCB PCBs (total) 1336‐36‐3 3.3E+02 64 116 3.2E+06 64 116 2.5E+06 64 116, 82 8.2E‐02 1.2E‐01 64 116 1.2E‐02 64 116 7.7E‐05 1.2E‐04 64 116 1.7E‐01 69 116 4.3E‐05 69 116 4.5E‐01 64 116, 115 1.4E‐01 62 7.0E‐01 62 117, 110

INORG Antimony 7440‐36‐0 1.2E+02 50.3 4.5E+01 44 40 48 40 48 1.0E‐03 62 0.0E+00 62 INORG Arsenic 7440‐38‐2 7.5E+01 50.3 2.9E+01 44 43 40 48 40 48 1.0E‐03 62 3.0E‐02 62 INORG Barium 7440‐39‐3 1.4E+02 50.3 4.1E+01 44 43 40 48 40 48 1.0E‐03 62 0.0E+00 62 INORG Beryllium 7440‐41‐7 9.0E+00 50.3 7.9E+02 44 43 1 61 40 48 40 48 1.0E‐03 62 0.0E+00 62 INORG Cadmium 7440‐43‐9 1.1E+02 50.3 7.5E+01 44 43 1 61 40 48 40 48 1.0E‐03 62 1.0E‐03 62 INORG Chromium (total) 7440‐47‐3 5.2E+01 50.3 1.9E+01 44 43, 45 1 61 40 48 40 48 2.0E‐03 62 45 0.0E+00 62 INORG Chromium III 16065‐83‐1 5.2E+01 50.3 1.8E+06 44 43 1.0E‐03 62 0.0E+00 62 INORG Chromium VI 18540‐29‐9 5.2E+01 50.3 1.9E+01 44 43 40 48 40 48 2.0E‐03 62 0.0E+00 62 INORG Cobalt 7440‐48‐4 5.9E+01 50.3 4.5E+01 35 1 61 4.0E‐04 62 0.0E+00 62 INORG Copper 7440‐50‐8 6.4E+01 50.3 3.5E+01 35 1 61 40 48 40 48 1.0E‐03 62 0.0E+00 62 INORG Lead 7439‐92‐1 2.1E+02 50.3 9.0E+02 35 1 61 40 48 40 48 1.0E‐04 62 0.0E+00 62 INORG Manganese 7439‐96‐5 5.5E+01 50.3 6.5E+01 35 1.0E‐03 62 0.0E+00 62 INORG Mercury 7439‐97‐6 2.0E+02 67 1 48 1.0E+03 67 2.9E‐01 4.1E‐01 67 123 5.6E‐02 1 2.0E‐03 3.0E‐03 50.3 2.7E‐01 44 5.4E‐05 44 1.0E‐03 62 0.0E+00 62 INORG Molybdenum 7439‐98‐7 9.6E+01 50.1 2.0E+01 35 40 48 40 48 1.0E‐03 62 0.0E+00 62 INORG Nickel 7440‐02‐0 5.9E+01 50.3 6.5E+01 44 43 1 61 40 48 40 48 2.0E‐04 62 0.0E+00 62 INORG Selenium 7782‐49‐2 7.9E+01 50.3 5.0E+00 44 43 40 48 40 48 40 48 1.0E‐03 62 0.0E+00 62 INORG Silver 7440‐22‐4 1.1E+02 50.3 8.3E+00 44 43 1 61 40 48 40 48 6.0E‐04 62 0.0E+00 62 INORG Thallium 7440‐28‐0 2.0E+02 50.3 7.1E+01 44 43 1 61 40 48 40 48 1.0E‐03 62 0.0E+00 62 INORG Vanadium 7440‐62‐2 5.1E+01 50.3 1.0E+03 44 1 61 40 48 40 48 1.0E‐03 62 0.0E+00 62 INORG Zinc 7440‐66‐6 6.5E+01 50.3 6.2E+01 44 43 1 61 40 48 40 48 6.0E‐04 62 0.0E+00 62 CDDF 2,3,7,8‐Tetrachlorodibenzo‐p‐dioxin (TEQ) 1746‐01‐6‐TEQ 3.2E+02 50.3 4.4E+06 1 3.4E+06 1 82 2.0E‐03 3.1E‐03 50.3 123 2.0E‐04 50.3 1.5E‐09 2.3E‐09 50.3 4.1E‐01 40 6.9E‐05 40 6.0E‐01 1 115 3.0E‐02 62 109 6.0E‐01 62 117

References:

1 USEPA. 1992. Handbook of RCRA Ground‐Water Monitoring Constituents. Chemical and Physical Properties (40 CFR Part 264, Appendix IX). EPA‐530‐R‐92‐022. September.

35 Baes III, C.F., R.D. Sharp, A.L. Sjoreen, and R.W. Shor. 1984.