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� s TABLE B-5 SUMMARY OF PESTICIDE CONCENTRATIONS IN POST-EXCAVATION SOIL AND HEALTH-BASED CRITERIA FOR SOIL INGESTION PHASE II SITE INVESTIGATION AND SITE CLOSURE REPORT CAL-FARM SUPPLY STOCKTON FACILITY K/J/C 882526.01 Proposed Concentration RCRA Criteria Prop 65 Potentially Range for Averages EPA for Systematic No Significant Relevant Frequency of Detected Values Concentration Carcinogen Toxicants RCRA Risk Criteria Risk Criteria (u Pesticide Detection g/Kg) (uu/Kg) Classificattonb _ MAO _. RSD (ug/Kg)d (ug/Kg) NOW alpha-BHC 2/22 100-200 37 B - 110f 3,000 110 beta-BHC 1/22 34 26 C - 3,900f 5,000 3,900 gamma-BHC 1/22 34 26 C 20,000g'h 5,400 6,000 5,400 delta-BHC 1/22 15 25 D - - - - Endosulfan 11 2/22 70 - 310 38 Unk 4,000 - - 4,000 4,41-UDE 21/22 32 - 1,600 444 B - 2,100 - 2,100 4,4'-DDD 21/22 67 - 2,200 619 e - 2,900 - 2,900 4,4'-DDT 21/22 96 - 1,700 435 8 40,0009'h 2,100 20,000 2,100 Endrin 1/22 77 30 D 20,0009 - - 20,000 Methoxychlor 9/22 25 - 710 148 D - - - - Atrazine 1/9 6 1 1 8 C 400,000f'g - - 400,000 a Arithmatic average calculated using one-half the detection Limit for chemical concentrations not detected b EPA Carcinogen Classification Group B = probable Human carcinogen Group C = possible human carcinogen Group D = not classifiable c. Source RCRA Facility Investigation (RFI) Guidance Document, EPA, May 1984, Table 8-7 for Systematic Toxicants d Source RCRA Fagtlity Investigation (RFI) Guidance Document, EPA, May 1989, Table 8-6 for Carcinogens, RSD = Risk-specific Dose for 10.6 risk for Class A and B, and 10 risk for Class C. e Source California Code of Regulations, Title 22, Proposed Amendment to Section 12711 f. EPA Integrated Risk Information System (IRIS) g Target organ = liver h Target organ = kidney Unk = Unknown - = Not Available WP113 882526.01