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APPENDIX B <br /> INTRODUCTION <br /> The purpose of this human health assessment (HHA) is to estimate the <br /> human health risks potentially posed by the pesticides that were <br /> detected in the surface soil at the Cal -Farm Supply Stockton facility <br /> and to estimate the reductions in pesticide concentrations that would be <br /> necessary to be protective of human health. A list of the pesticides <br /> detected in the surface soil during the characterization phase of the <br /> investigation are listed in Table B-1. <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 /> This exposure assessment is 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 compar- <br /> isons between EPA-established exposure limit criteria and site <br /> conditions. <br /> • Risk Characterization - combines information from both the <br /> exposure assessment and the toxicity assessment to <br /> characterize potential baseline health risks <br /> EXPOSURE ASSESSMENT <br /> The facility has been closed since 1985 so activities at the site are <br /> restricted to investigative and remediation activities Currently, the <br /> site is zoned light industrial . It is anticipated that future uses of <br /> the site may include commercial uses or remain light industrial . <br /> However, adjacent properties are used as residential areas; therefore, <br /> future development of the site for residential uses is also considered <br /> in this HHA. <br /> The significant potential human exposure routes identified which are <br /> relevant for this site are <br /> • soil - ingestion <br /> • air - inhalation <br /> . Dermal absorption of chemicals at the site is not considered to be a <br /> significant pathway compared with the ingestion and inhalation exposure <br /> WPI13 B-1 882526 01 <br /> i <br />