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KLEINFELDER File No. 20-3978-O1.W10 July 26, 1997 Section of This Recommended Recommended Remediation Gaal l Letter/Area Lead Agency 4.5!Septic System PHS/EHD For Borings 5-5 and 5-6(within the proposed residential Locations area)use U.S.EPA Region IX Preliminary Remediation Goals(PRGs)for soil and tap water in Residential Property dated August 1, 1996 of: • barium(soil)=5,300 mg/kg • total chromium(soil)=210 mg/kg • cobalt(soil)=4,600 mg/kg • copper(soil)=2,800 mg/kg • total lead(soil)=400 mg/kg • mercury(soil)=6.5 mg/kg • nickel(soil)= 1,500 mg/kg • silver(soil)=380 mg/kg • vanadium(soil)=540 mg/kg • zinc(soil)=23,000 mg/kg • barium(water)=2.6 mg/L • chromium(water)=0.180 mg/L (PRG is for Cr ) • vanadium(water)=0.260 mg/L • zinc(water)= 11 mg/L For all other locations use TTLC and STLC Regulated 4.5/Septic System PHS/EHD Levels for metals per 22CCR§66261,Passive Locations(continued) Bioremediation per the LLNL Study'for all fuels and other applicable hydrocarbons and U.S.EPA Region IX Preliminary Remediation Goals(PRGs)for Industrial Property dated August 1, 1996 for all other contaminants of: • arsenic(soil)=500 mg/kg(TTLC)and 5 mg/L(STLC) • barium(soil)= 10,000 mg/kg(TTLC)and 100 mg/L (STLC) • cadmium(soil)= 100 mg/kg(TTLC)and 1 mg/L(STLC) • total chromium(soil)=2,500 mg/kg(TTLC)and 5 mg/L(STLC) • cobalt(soil)=8,000 mg/kg(TTLC)and 80 mg/L (STLC) • copper(soil)=2,500 mg/kg(TTLC)and 25 mg/L (STLC) • lead(soil)= 1,000 mg/kg(TTLC)and 5 mg/L(STLC) • mercury(soil)=20 mg/kg(TTLC)and 0.2 mg/L (STLC) • molybdenum(soil)=3,500 mg/kg(TTLC)and 350 mg/L(STLC) • nickel(soil)=2,000 mg/kg(TTLC)and 20 mglL 20-3978-01.W10/2017L155 Page 40 of 50 Copyright 1997,Kleinfelder,Inc.