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Table 3 Geosyntec Consultants Statistical Summaries of Chemicals Analyzed in Soil and Comparison to Industrial/Commercial Screening Levels- Skeet Trap Subarea Site 47,Port of Stockton Min Mean Max No.of EF of Detected EF of Detected Max EF Is Analyte Max EF Max EF No.of No.of r sa d Max Conc. Min ND Mean ND Max ND No.of NDs EF of NDs Is SL Background FOD HH SL Reference HH 9L' Unite Detected Detected Detected Detections Values EF of NDs Values (max Conc.(DI (max detect/ Background Samples Detections Cone. Cone. Cone. Depth Conc. Conc. Conc. >SL >SL >2x the SL >2x the SL >2x the SL detect/the SL) Available? >SLR Soil SL background) >SL Pesticides(µg/kg) 4,4'-DDD(p,p'-DDD) 27 4 15% DTSC HHRA Note 3 Industrial RSL(C) 6200 µg/kg 20 426 1,600 0 3.5 4.2 4.9 0 0 0% 0% 0 0 0.3 Y - - - - 4,4'-DDE(p,p'-DDE) 27 9 33% DTSC HHRA Note 3 Industrial RSL(C) 9300 µg/kg 1.7 79.4 380 0 3.5 4.1 4.8 0 0 0% 0% 0 0 0 Y - - - - 4,4'-DDT(p,p'-DDT) 27 14 52% DTSC HHRA Note 3 Industrial RSL(C) 7100 µg/kg 1.8 24.4 220 0 3.6 4.1 4.8 0 0 0% 0% 0 0 0 Y - - - - Aldrin 27 0 0% DTSC HHRA Note 3 Industrial RSL(C) 180 µg/kg - - - - 1.1 2.1 2.5 0 0 0% 0% 0 0 - Y - - - - Chlordane,alpha-(Chlordane,cis-) 27 0 0% - - - - - - 1.1 2.1 2.5 - - - - - - - - - - - - Chlordane,beta-(Chlordane,trans-) 27 2 7% - - 1.5 1.65 1.8 0 1.8 2.1 2.5 - - - - - - - - - - - - Chlordane(sum of isomers) - - DTSC HHRA Nate 3 Industrial RSL(C) 6100 µg/kg 1.5 1.65 1.8 0 - - - - - - - - - - Dieldrin 27 1 4% DTSC HHRA Nate 3 Industrial RSL(C) 93 µg/kg 2.4 2.4 2.4 0 3.5 4.2 4.9 0 0 0% 0% 0 0 0 Y - - - - Endosulfan sulfate 27 1 4% EPA Industrial RSL(NC) 4900000 µg/kg 6.9 6.9 6.9 0 2.3 4.2 4.9 0 0 0% 0% 0 0 0 Y - - - - Endosulfan,alpha-(I) 27 0 0% - - - - - 1.1 2.1 2.5 - - - - - - - - - - - Endosulfan,beta(II) 27 0 0% - - - - - 2.3 4.1 4.9 - - - - - - - - - - Endrin 27 0 0% DTSC HHRA Note 3 Industrial RSL INC) 160000 µg/kg - - - - 2.3 4.1 4.9 0 0 0% 0% 0 0 - Y - - - - Endrinaldehyde 27 0 1 0% - - - I1 2.3 1 4.1 4.9 - - - - - - Endrinketone 27 0 0% _ 2.3 4.1 4.9 _ _ _ _ _ _ - - - - _ _ _ _ _ _ Hcptachlor 27 0 0% DTSC HHRA Note 3 Industrial RSL(C) 630 µg/kg 0.33 0.9 2.5 0 0 0% 0% 0 0 - Y - - - Hcptachlor epoxide 27 3 11% DTSC HHRA Note 3 Industrial RSL(C) 330 µg/kg 0.42 L74 3.8 0 0.33 1 2.5 0 0 0% 0% 0 0 0 Y - - - Hcxachlorocyclohexme(BHC),alpha- 27 0 0% DTSC HHRA Note 3 Industrial RSL(C) 1 240 1 µg/kg 1.1 2.1 2.5 0 0 0% 0% 0 0 - Y - - - Hcxachlorocyclohexme(BHC),beta- 27 0 0% DTSC HHRA Note 3 Industrial RSL(C) 820 µgAg 1.1 2.1 2.5 0 0 0% 0% 0 0 - Y - - - Hcxachlorocyclohexane(BHC),delta- 27 0 0% _ 1.1 2.1 2.5 _ _ _ _ _ _ - - - - _ _ _ _ _ _ Hcxachlorocyclohexme(BHC),gamma-(Lindanc 27 0 0% DTSC HHRA Note 3 Industrial RSL(C) 2000 µg/kg - - - - 1.1 2.1 2.5 0 0 1 0% 0% 0 0 - Y - - - - Methoxychlor 27 1 4% DTSC HHRA Note 3 Industrial RSL(NC) 2600000 µg/kg 21 21 21 0 11 21 25 0 0 0% 0% 0 0 0 Y - - - - Toxaphene 27 0 0% DTSC HHRA Note 3 Industrial RSL(C) 1200 µg/kg - - - - 92 1 146.7 250 0 1 0 0% 1 0% 0 0 - Y - - - - Polychlorinated Biphenyl Aroclors(µg/kg) Amelor 1016 27 0 0% DTSC HHRA Note 3 Industrial RSL(C) 17000 µg/kg - - - - 17 26.7 48 0 0 0% 0% 0 0 - Y - - - - Aroclor 1221 27 0 0% DTSC HHRA Note 3 Industrial RSL(C) 530 µg/kg - - - - 17 38.7 98 0 0 0% 0% 0 0 - Y - - - - Aroclor 1232 27 0 0% DTSC HHRA Note 3 Industrial RSL(C) 490 µg/kg - - - - 17 26.7 48 0 0 0% 0% 0 0 - Y - - - - Aroclor 1242 27 0 0% DTSC HHRA Note 3 Industrial RSL(C) 580 µg/kg - - - - 17 26.7 48 0 0 0% 0% 0 0 - Y - - - - Aroclor 1248 27 0 0% DTSC HHRA Nate 3 Industrial RSL(C) 580 µg/kg - - - - 17 26.7 48 0 0 0% 0% 0 0 - Y - - - - Aroclor 1254 27 0 0% DTSC HHRA Note 3 Industrial RSL(C) 590 µg/kg - - - 17 26.7 48 0 0 0% 0% 0 0 - Y - - - - Aroclor 1260 27 2 7% DTSC HHRA Note 3 Industrial RSL(C) 600 µg/kg 1 30 35.5 41 0 17 27.1 48 0 0 0% 0% 0 0 0.1 Y - - - - n-Alkones and Isoprenoids(mg/kg) n-Eicosane(C20) 1 I t00% - 0.19 0.19 0.19 0 - - - - - - - - Total Petroleum Hydrocarbons(mg/kg) Diesel range hydrocarbons 20 0 0"/o Water Board ESLs INC) 1200 - 7.2 12.9 72 FALSE Gasoline range hydrocarbons 12 0 0% Water Board ESLs INC) 2000 0.058 0.1 0.079 FALSE Motor oil range hydrocarbons 20 7 35% Water Board ESLs(NC) 180000 17 221 860 0 12 15.2 19 - - - FALSE Notes µg/kg-micrograms per kilogram HH=human health 2x-multiply by a factor of 2 Meq-mithequivalents Conc.-concentration mg/kg-milligrams per kilogram D-detect ND-non-detect EF=exceedance frequency Pet=percent FOD=frequency of detection SL=screening level 1 Department of Toxic Substances(DTSC),Human and Ecological Risk Office(HERO),2030.Human Health Risk Assessment(HHRA)Note.HERO HHRA Note Number:3.DTSC-modified Screening Levels(DTSC-SLs).Table I(Soil).Release date:June 2020. 2 United States Environmental Protection Agency(EPA),2020.Regional Screening Levels(RSLs)-Generic Tables.Screening Levels=Composite Worker Soil(TR=1E-06 THQ=1.0).Updated November 2020.Available online at:https://w .epa.gov/risk/regional-screening-levels-rsls-generic-tables 3 California Regional Water Quality Control Board,Environmental Screening Levels(ESLs),July 2019 4 Selected lowest of cancer(C)or non-cancer(NC)human health screening levels from source I or 2,in that order of priority. 5 The dataset includes field duplicates;the maximum concentration was used if there was a detection in both samples.If there was a detection in one sample but not the other,the detected concentration was selected. Rough and Ready Island Port of Stockton Remediation Management Page 3 of 3 February 2022