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i <br /> I <br /> Kennedy/Jenks/Chilton <br /> Range of Concentrations <br /> ' Compound Detected (ug/Kg <br /> Beta BHC <62 5 to 76 0 <br /> 4,4'-DDE 130 to 26,000 <br /> 4,4'-DDD 350 to 72,000 <br /> 4,4'-DDT 110 to 130,000 <br /> Methoxychlor <62.5 to 150 <br /> ' The high concentration of pesticides in the extract from some of the <br /> samples required dilution of the extract as per EPA laboratory protocol . <br /> ' This resulted in higher detection limits for the other compounds <br /> analyzed in the extract. Based upon the results of laboratory analyses <br /> and as suggested by the Regional Water Quality Control Board, a human <br /> health assessment was performed to evaluate the health risks of <br /> ' pesticides in soil . <br /> Human Health Assessment <br /> ' A human health assessment (HHA) was performed to evaluate current and <br /> potential human health risks posed by pesticides detected in surface <br /> ' soil at the Cal -Farm Supply Stockton facility. The human health <br /> assessment is provided in Appendix B A brief discussion of the <br /> procedures used for the assessment and the results are provided below. <br /> The approach used in evaluating the potential health risks posed at the <br /> site was based on the recommended procedures for conducting a Health and <br /> Environmental Assessment contained in the Interim Final RCRA Facility <br /> ' Investigation (RFI) Guidance Document (EPA 530/SW-89-031, May 1989) , and <br /> the Risk Assessment Guidance for Superfund, Human Health Evaluation <br /> Manual , Part A (June 1989) <br /> ' The HHA was divided into the following discussions. <br /> • Exposure Assessment - estimates the magnitude of potential <br /> human exposure, the frequency and duration of these exposures <br /> and the potential exposure pathways. <br /> ' Toxicity Assessment - develops exposure route-specific <br /> comparisons between EPA-established exposure limited criteria <br /> and site conditions. <br /> ' Risk Characterization - combines information from both the <br /> exposure assessment and the toxicity assessment to <br /> characterize potential baseline health risks <br /> ' The routes of exposure identified at the site were ingestion of soil and <br /> inhalation of air-borne dust. Concentrations of individual pesticides <br /> in soil exceeded EPA criteria for the soil ingestion exposure route. A <br /> hazard index (HI) , which assesses the additive effects of exposure to <br /> ' WPI13 2 2 882526 01 <br />