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Table 1: CRITERIA FOR EVALUATING ANALYTICAL RESULTS FOR METALS IN SOILS HAZARDOUS WASTE SCREENING EVALUATION RISK SCREENING EVALUATION C A only Hazardous Waste C A only Hazardous Waste RCRA MetalsHazardous WastePb only (selected analysis)PRG EPA Region 9CAL-Modified PRG updatesPRGEPA Region 9Extraction Method TOTAL METALS WET TCLPDI-WETTOTAL METALSTOTAL METALSTOTAL METALSSample Selection all samples s amples with highest Pb samples with highest Pbsamples with highest PbND>sample>TTLCND>sample>TTLCND>sample>TTLC CRITERIA TTLC STLC Toxic Characteristics RWQCB Criteria RESIDENTIALRESIDENTIALINDUSTRIALANALYTE (mg/kg) (mg/L) (mg/L)(mg/L)(mg/kg)(mg/kg)(mg/kg)As 500 5 5 3.90E -011.60E+00Ag 500 5 5 3.90E+025.10E+03 Ba 10,000 100 1005.40E+036.70E+04 Be 75 0.75 1.50E+021.90E+03Cd 100 1 1 3.70E+011.7E+004.50E+02Cr (total) n/a n/a 5 2.10E+024.50E+02Cr III 2 500 5 n/a1.00E+051.00E+05Cr VI 500 5 n/a3.00E+016.40E+01Co 8000 80 9.00E+021.90E+03Cu 2500 25 3.10 E+034.10E+04Pb 1000 5 5 4.00E+021.50E+027.50E+02Hg 20 0.2 0.20.0 E+00 0.00E+00 Mo 3500 350 3.90E+025.10E+03 Ni 2000 20 1.60E+032.00E+04Sb 500 15 3.10E+014.10E+02Se 100 1 1 3.90E+025.10E+03 Tl 500 15 5.20E+006.70E+01 V 2400 24 5.50E+027.20E+03 Zn 5000 250 2.30E+041.00E+05note: yellow (shaded) entries indicate minimum requiredanalysis for PWCS note: total Cr (1:6 ratio Cr Vl:Cr III) assumed for PRGs note: PRG for Ni is for soluble salts note: STLC analysis is also required for an analyte if the total analysis exceeds 10 times the STLC criteriaReferences: 1) Code of Federal Regulations, Title 40, Section 261.24; 2) California Code of Regulations, Title 22, Section 66261.24; 3 ) U.S. Environmental Protection Agency, Preliminary Remediation Goals, Region 9 (2002).DRAFT