Table 1 Summary of Preliminary Cleanup Levels West of 4th Site Seattle, Washington Farallon PN:

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1 Table Summary of Preliminary s Preliminary s Soil Air Surface Water Sediment Puget Sound Background Concentrations for Metals Direct Direct (Unrestricted Land Use) 2 (Industrial Land Use) 2 Air Quality based on Protection of as Potable Drinking Water 3 Concentrations Surface Water Quality 4 Cleanup Level Air Quality Water Table Zone (Unrestricted Land Use) 5 Cleanup Level Air Quality Water Table Zone (Industrial Land Use) 5 Surface Water 6 Sediment 7 Air Inhalation Pathway (Unrestricted Land Use) 2 Air Protective of Inhalation Pathway (Industrial Land Use) 2 Surface Water Cleanup Level Human Health 8 Surface Water Cleanup Level Aquatic Life Sediment 9 Carcinogen or Non- Carcinogen (Micrograms/cubic meter) Tetrachloroethene Carcinogen , , Trichloroethene Carcinogen -- 2, ,760, ,950 cis-,2-dichloroethene Non-Carcinogen , trans-,2-dichloroethene Non-Carcinogen --,600 70, ,224, , ,-Dichloroethene Non-Carcinogen -- 4,000 75, , Vinyl chloride Carcinogen , ,4-Dioxane Carcinogen -- 0, ,55 25, Arsenic Carcinogen Not Applicable Not Applicable Not Applicable 0.4 / Not Applicable Not Applicable 0.4 / Barium Non-Carcinogen -- 6, ,000 Not Applicable 824 Not Applicable Not Applicable Not Applicable Not Applicable Cadmium Non-Carcinogen 80 3,500 Not Applicable.2 Not Applicable Not Applicable Not Applicable Not Applicable Copper Non-Carcinogen 36 3,200 40,000 Not Applicable. Not Applicable Not Applicable 3. 8,000 Not Applicable Not Applicable Iron Non-Carcinogen 58,700 58,700 2,450,000 Not Applicable -- Not Applicable Not Applicable Not Applicable Not Applicable, Manganese Non-Carcinogen,200, ,000 Not Applicable -- Not Applicable Not Applicable Not Applicable Not Applicable Nickel Non-Carcinogen 48,600 70,000 Not Applicable Not Applicable Not Applicable 8.2 2,200 Not Applicable Not Applicable Zinc Non-Carcinogen 85 24,000,050,000 Not Applicable 0 Not Applicable Not Applicable 8 6,600 Not Applicable Not Applicable, Preliminary cleanup levels presented represent the most stringent cleanup levels for the constituent of concern listed in the media indicated. -- indicates no value is available. In the case of ARARs, the reference sources do not publish values for the noted chemicals. In the case of calculated values, one or more input parameters are not available. "Not Applicable" is used where the constituent of concern will not affect the media of potential concern due to an incomplete pathway. Background metals values from Ecology Publication No. 94-5, Natural Background Soil Metals Concentrations in Washington State. Arsenic background from MTCA, Table 740- Method A s for Unrestricted Land Uses. 2 Cleanup level is based on standard Washington State Model Toxics Control Act Cleanup Regulation (MTCA) Method B (unrestricted land use) or Method C (industrial land use) values from the Cleanup and Risk Calculations tables (CLARC). 3 Soil cleanup levels for protection of air quality are calculated using MTCA Equation 747- where the potable Method B groundwater cleanup level was used as Cw. Concentrations of hazardous substances in soil that meet the potable groundwater protection standard currently are considered sufficiently protective of the air pathway for unrestricted and industrial land uses. 4 Soil cleanup levels for protection of surface water quality are calculated using MTCA Equation 747- where the groundwater cleanup level protective of surface water in this table was used as Cw. 5 cleanup levels protective of the air pathway for unrestricted land use (residential and commercial sites) and industrial land use were derived using the following equation: GWcul = Aircul/GIVF. 6 Human health and marine aquatic ecologic receptors were considered. Refer to the Surface Water s Human Health and Aquatic Life in this table. The more stringent value of the two receptors has been listed for the Surface Water. 7 screening levels based on the transfer of contaminants from groundwater to sediment were calculated by dividing the sediment screening level by the associated partition coefficients. Koc and Kd values are from MTCA. Fraction of carbon assumed at 0.02 based on Lower Duwamish Waterway Feasibility Study (AECOM, 202). 8 The most stringent exposure pathway for human health receptors are for consumption of fish. Listed values are based on ARARs listed in CLARC except: (),4-dioxane is derived from MTCA Method B default values and values; (2) PCE, TCE, trans-dce, vinyl chloride, nickel and zinc are based on EPA's revised CWA Human Health Criteria - Organism Only dated /5/6. 9 Sediment has not been confirmed to be affected by groundwater discharge to surface water. Sediment cleanup levels were derived from the Lower Duwamish Waterway Superfund Site Record of Decisions (EPA, 204), which does not contain values for nickel, TCE, PCE, or vinyl chloride. These constituents are not listed in the Sediment Management Standards (WAC ) either. EPA Region 3 BTAG Marine 0 Arsenic Cleanup level of 5 ug/l based on background concentrations for state of Washington (MTCA Table 720-). The surface water cleanup level for copper had previously been tabulated as 2.4ug/L; however this value is based on an approach using site-specific water effects ratio which has not been determined. We have replaced this with 3. ug/l, National Recommended Water Quality Criteria published by EPA under 304 of the Federal Clean Water Act - Aquatic Life Criteria Table 2 Oak Ridge Nation Laboratory (ORNL) Toxicological Benchmarks for Screening Potential Contaminants of Concern for Effects on Aquatic Biota 3 Peer Review Literature - DeRooij et al., 2004, Euro Chlor Risk Assessment for the Marine Environment OSPARCOM Region North Sea Environmental Monitoring and Assessment 4 WAC A National Recommended Water Quality Criteria published by EPA under 304 of the Federal Clean Water Act - Aquatic Life Criteria Table Table updated August 4, 205 based on revisions to AWQC; July 20, 206 based on Ecology comments on the Draft FS Reports for SU and SU2 (clarify footnotes, add sediment values, add surface water CULs protective of aquatic life); and January 7, 207 based on EPA's revisions to the Clean Water Act Human Health criteria (dated /5/6). /27/207 S:\Art Brass Plating \W4 Joint Deliverables\PSCS Memo_CULs\Prelim Cleanup Standards tbls_0277.xlsx Table of

2 Table A- Soil Preliminary s Puget Sound Background Concentrations for Metals in Soil Surface Water Indoor Air 2 as Drinking Water 2 Direct - (Method B) 3 Direct Non-carcinogenic (Method B) 3 Direct (Method C) 3 Direct Non-carcinogenic (Method C) 3 Tetrachloroethene Not Applicable ,500 2,000 Trichloroethene Not Applicable ,850,750 cis-,2-dichloroethene Not Applicable Not Applicable Not Applicable 0.39 Not Applicable 60 Not Applicable 7,000 trans-,2-dichloroethene Not Applicable Not Applicable,600 Not Applicable 70,000,-Dichloroethene Not Applicable Not Applicable 4,000 Not Applicable 75,000 Vinyl chloride Not Applicable ,500,4-Dioxane Not Applicable ,400,30 05,000 Arsenic Not Applicable ,050 Barium Not Applicable 3.3 Not Applicable 6,000 Not Applicable 700,000 Cadmium.2 Not Applicable Not Applicable 80 Not Applicable 3,500 Copper 36. Not Applicable 36 Not Applicable 3,200 Not Applicable 40,000 Iron 58,700 Not Applicable Not Applicable Not Researched Not Applicable 56,000 Not Applicable 2,450,000 Manganese,200 Not Applicable Not Applicable Not Researched Not Applicable,200 Not Applicable 490,000 Nickel 48 Not Applicable 48 Not Applicable,600 Not Applicable 70,000 Zinc 85 0 Not Applicable 0 Not Applicable 24,000 Not Applicable,050, indicates no value is available. In the case of ARAs, the reference sources do not publish values for the noted chemicals. In the case of calculated values, one or more input parameters are not available. Soil cleanup levels for protection of surface water quality are preliminary values only. Values are calculated using Washington State Model Toxics Control Act Cleanup Regulation (MTCA) Equation 747- where the groundwater cleanup level protective of surface water in this table was used as Cw. 3 Cleanup level is based on standard MTCA Method B (unrestricted land use) or Method C (industrial land use) values from the Cleanup and Risk Calculations tables (CLARC). Table updated August 4, 205 based on revisions to AWQC. Soil Preliminary s 2 Soil cleanup levels for protection of air quality are preliminary values only. Values are calculated using MTCA Equation 747- where the potable Method B groundwater cleanup level was used as Cw. Concentrations of hazardous substances in soil that meet the potable groundwater protection standard currently are considered sufficiently protective of the air pathway for unrestricted and industrial land uses. /27/207 S:\Art Brass Plating \W4 Joint Deliverables\PSCS Memo_CULs\Prelim Cleanup Standards tbls_0277.xlsx of

3 Table A-2 and Surface Water Preliminary s Cleanup Level Air Quality (Unrestricted Land Use) Cleanup Level Surface Water- Human Health Method B Native Cleanup Level Surface Water- Human Health Method B Native Cleanup Cleanup Cleanup Cleanup Cleanup Cleanup Cleanup Level Air Level Air Level Air Level Surface Level Surface Level Surface Level Surface Quality (Unrestricted Land Use) Quality ( Industrial Land Use) Quality ( Industrial Land Use) Method B Defaults 2 Method B Defaults 2 Method B API 3 Method B API 3 American 4 American 4 Non-carcinogenic Non-carcinogenic Non-carcinogenic Non-carcinogenic Non-carcinogenic Cleanup Level Surface EPA ARARs 5 Cleanup Level Surface Water - Aquatic Receptors Tetrachloroethene 6 22, Trichloroethene cis-,2-dichloroethene trans-,2-dichloroethene , , , ,540,000 --,-Dichloroethene , , , , Vinyl chloride , , , ,4-Dioxane 2,55 69,897 25,50 53, Arsenic Not Applicable Not Applicable Not Applicable Not Applicable Barium Not Applicable Not Applicable Not Applicable Not Applicable Cadmium Not Applicable Not Applicable Not Applicable Not Applicable Copper Not Applicable Not Applicable Not Applicable Not Applicable -- 2, Iron Not Applicable Not Applicable Not Applicable Not Applicable , Manganese Not Applicable Not Applicable Not Applicable Not Applicable Nickel Not Applicable Not Applicable Not Applicable Not Applicable --, Zinc Not Applicable Not Applicable Not Applicable Not Applicable -- 6, , ,370, indicates no value is available. In the case of ARAs, the reference sources do not publish values for the noted chemicals. In the case of calculated values, one or more input parameters are not available. cleanup levels protective of the air pathway for unrestricted land use (residential and commercial sites) and industrial land use were derived using the following equation: GWcul = Aircul/GIVF. 2 Cleanup level is based on standard Washington State Model Toxics Control Act Cleanup Regulation (MTCA) Method B default values from the Cleanup and Risk Calculations tables (CLARC). 3 MTCA s and Risk Calculations Method B Modified based on Asian Pacific Island (API) Exposure scenarios for the consumption of fish for the groundwater-to-surface water pathway using MTCA Equations 730- (non-carcinogens) or (carcinogens). 4 Cleanup levels based on MTCA Equation 730- (non-carcinogens) or (carcinogens). Default values used with exception of: Equation Average Body Weight (8.8 kilograms), Fish Consumption Rate (97.5 grams/day), Fish Diet Fraction (), Averaging Time (64 years), and Exposure Duration (64 years) Equation Averaging time of 70 years, and inputs for Equation 730- above 5 Applicable or Relevant and Appropriate Requirement (ARAR) values obtained from the current United States Environmental Protection Agency (EPA) National Recommended Water Quality values for Human Health. 6 Oak Ridge Nation Laboratory (ORNL) Toxicological Benchmarks for Screening Potential Contaminants of Concern for Effects on Aquatic Biota 7 Peer Review Literature - DeRooij et al., 2004, Euro Chlor Risk Assessment for the Marine Environment OSPARCOM Region North Sea Environmental Monitoring and Assessment 8 WAC A National Recommended Water Quality Criteria published by EPA under 304 of the Federal Clean Water Act - Aquatic Life Criteria Table Table updated August 4, 205 based on revisions to AWQC; July 20, 206 based on Ecology comments on the Draft FS Reports for SU and SU2; and January 7, 207 based on EPA's revisions to the Clean Water Act Human Health criteria (dated /5/6). Preliminary s /27/207 S:\Art Brass Plating \W4 Joint Deliverables\PSCS Memo_CULs\Prelim Cleanup Standards tbls_0277.xlsx of

4 Table A-3 Air Preliminary s Air Preliminary s Air Inhalation Pathway - (Residential Sites) Air Inhalation Pathway - Non-carcinogenic (Residential Sites) Air Inhalation Pathway - (Industrial Sites) Air Inhalation Pathway - Non-carcinogenic (Industrial Sites) (Micrograms/cubic meter) Tetrachloroethene Trichloroethene cis-,2-dichloroethene Not Applicable Not Applicable Not Applicable Not Applicable trans-,2-dichloroethene Not Applicable 27.4 Not Applicable 60,-Dichloroethene Not Applicable 9.4 Not Applicable 200 Vinyl chloride ,4-Dioxane Arsenic Not Applicable Not Applicable Not Applicable Not Applicable Barium Not Applicable Not Applicable Not Applicable Not Applicable Cadmium Not Applicable Not Applicable Not Applicable Not Applicable Copper Not Applicable Not Applicable Not Applicable Not Applicable Iron Not Applicable Not Applicable Not Applicable Not Applicable Manganese Not Applicable Not Applicable Not Applicable Not Applicable Nickel Not Applicable Not Applicable Not Applicable Not Applicable Zinc Not Applicable Not Applicable Not Applicable Not Applicable Cleanup level is based on standard Washington State Model Toxics Control Act Cleanup Regulation (MTCA) Method B (unrestricted land use) or Method C (industrial land use) values from the Cleanup and Risk Calculations tables (CLARC). /27/207 S:\Art Brass Plating \W4 Joint Deliverables\PSCS Memo_CULs\Prelim Cleanup Standards tbls_0277.xlsx of

5 Table A-4 MTCA Equation 747- Calculations Cleanup Level Air (Unrestricted Land Use) Cleanup Level Air ( Industrial Land Use) Surface Water 2 f oc K oc K d H cc UCF DF Ɵ w Ɵ a ƿ b (grams/gram) (milliliters/gram) (liters/kilogram) (unitless) (milligrams/microgram) (unitless) (milliliters water/milliliters soil) (milliliters air/milliliters soil) (kilograms/liter) based on Cw air unrestricted based on Cw air industrial based on Cw surface water (milligrams per kilogram) Tetrachloroethene Trichloroethene cis-,2-dichloroethene nr Not Applicable Not Applicable Not Applicable trans-,2-dichloroethene 00 00, ,-Dichloroethene Vinyl chloride ,4-Dioxane Not Applicable Not Applicable 0.32 Arsenic Not Applicable Not Applicable Not Applicable Not Applicable Not Applicable Barium Not Applicable Not Applicable, Not Applicable Not Applicable Not Applicable 824 Cadmium Not Applicable Not Applicable Not Applicable Not Applicable Not Applicable.2 Copper Not Applicable Not Applicable Not Applicable Not Applicable Not Applicable. Iron Not Applicable Not Applicable nr Not Applicable Not Researched Not Applicable Not Applicable Not Applicable Manganese Not Applicable Not Applicable Not Applicable Not Researched Not Applicable Not Applicable Not Applicable Nickel Not Applicable Not Applicable Not Applicable Not Applicable Not Applicable Zinc Not Applicable Not Applicable Not Applicable Not Applicable Not Applicable 0 MTCA currently states that soil concentrations protective of groundwater as potable water are also sufficiently protective of the air pathway. Standard MTCA Method B groundwater cleanup levels were used for Cw. The most stringent cleanup level is listed in table. 2 cleanup level protective of surface water selected from Table representing the current most stringent cleanup level. Soil cleanup levels calculated using Washington State Model Toxics Control Act Equation 747- and default values for Koc, DF, Ɵw, Ɵa, and ƿb. Equation 747- follows: Soil cul = Cw (UCF) DF [Kd + (Ɵw, + Ɵa Hcc)/ƿb] Where: Cw = Preliminary groundwater cleanup level concentration UCF = Unit Conversion Factor Kd = Distribution coefficient calculated as (Koc)(foc) where Koc is the soil organic carbon partition coefficient and foc is the fraction organic carbon default value for the Site area Ɵw = Water-filled soil porosity Ɵa = Air-filled soil porosity Hcc = Henry's Law Constant derived from EPA values at 3 degrees Celsius ƿb = Dry soil bulk density Table updated August 4, 205 based on revisions to AWQC and January 7, 207 based on EPA's revisions to the Clean Water Act Human Health criteria (dated /5/6).. /27/207 S:\Art Brass Plating \W4 Joint Deliverables\PSCS Memo_CULs\Prelim Cleanup Standards tbls_0277.xlsx of