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Table 2 Geosyntec Consultants Statistical Summaries of Chemicals Analyzed in Soil and Comparison to Industrial/Commercial Screening Levels-Non Skeet Trap Subarea Site 47,Port of Stockton Min Mean Max Max No.of EF of Detected Max EF Is Analyte Max EF Max EF No.of No.of r a Min ND Mean ND Max ND No.of NDs EF of Detected EF of NDs Is SL Background FOD HH SL Reference HH SL"' Units Detected Detected Detected Detected Detections EF of NDs Values (max Conc.(D) (max detect/ Background Samples Detections Cone. Conc. Conc. Depth Conc. Conc. Conc. >SL >SL Values >2x the SL >2x the SL detect/the SL) Available? >SL? Soil SL background) >SL Hexachlorocyclohexane(BHC),gamma- (Lindane) 53 0 0% DTSC HHRA Note 3 Industrial RSL(C) 2A00 pg/kg 1.1 2.1 3.3 0 0 0% 0% 0 0 Y ethoxychlor 53 0 0% DTSC HHRA Note 3 Industrial RSL(NC) 2600000 µg/kg 1l 21.1 33 0 0 0% 0% 0 0 Y Toxaphene 53 0 0% DTSC HHRA Note 3 Industrial RSL(C) 12M µg/kg - - - 94 149.1 330 0 0 0% 0% 0 0 Y Polychlorinated Biphenyl Aroclors(µg/kg) Aroclor 1016 53 0 0% DTSC HHRA Note 3 Industrial RSL(C) 17000 µg/kg - 18 28 63 0 0 0% 0% 0 0 Y Aroclor 1221 53 0 0% DTSC HHRA Note 3 Industrial RSL(C) 530 µg/kg - - 18 42.5 130 0 0 0% 0% 0 0 Y Aroclor 1232 53 1 2% DTSC HHRA Note 3 Industrial RSL(C) 490 µg/kg 21 21 21 0 18 28.2 63 0 0 0% 0% 0 0 0 Y Aroclor 1242 53 0 0% DTSC HHRA Note 3 Industrial RSL(C) 580 µg/kg 18 28 63 0 0 0% 0% 0 0 Y - Aroclor 1248 53 0 0% DTSC HHRA Note 3 Industrial RSL(C) 580 µg/kg 18 28 63 0 0 0% 0% 0 0 Y - Aroclor 1254 53 0 0% DTSC HHRA Note 3 Industrial RSL(C) 590 µg/kg 18 28 63 0 0 0% 0% 0 0 Y Aroclor 1260 53 1 2% DTSC HHRA Note 3 Industrial RSL(C) 600 µg/kg 32 32 32 0 18 28.2 63 0 0 0% 0% 0 0 M Y n-Alkanes and Isoprenoids(mg/kg) n-Eicosane(C20) 1 1 100% 0.1 0.1 0.1 0 - - - - - - - - - - hytane I 1 100% - 0.27 0.27 0.27 0 - - - - - - - - - - - - Total Petroleum Hydrocarbons(mg/kg) Diesel range hydrocarbons 32 0 0% Water Board ESLs(NC) 1200 - - 7.1 11.3 20 - - - - - - - FALSE - - - Gasoline range hydrocarbons 11 0 0% Water Board ESLs(NC) 2000 - - 0.057 0.1 0.074 - - - - - - - FALSE - - - Motoroil range hydrocarbons 32 17 53% Water Board ESLs(NC) 180000 - 17 72.1 640 2 12 15.2 20 - - - - - - - - FALSE - - - Notes µg/kg=micrograms per kilogram HH=human health 2x=multiply by a factor of 2 Meq=milliequivalents 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:Jane 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:/Iwww.epa.gov/risk/regional-screening-levels-mis-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 1 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