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y r <br /> 4.0 RISK ASSESSMENT FOR EXISTING SITE CONDITIONS <br /> Environmental and health risk assessment is used to identify whether <br /> existing site conditions pose an environmental or health risk and what cleanup <br /> levels are required to mitigate those risks. For diesel spills, our site <br /> assessment will be based on the LeakingUnder round Fuel Tank Field Manual (or <br /> LUFT Manual) published by the State Water Resources Control Board (SWRCB) and <br /> on the health assessment techniques .as outlined in the California Site <br /> Mitigation Decision Tree and the EPA Superfund Public Health Evaluation <br /> Manual. These documents were selected as the primary references because they <br /> provide uniform processes for health assessments. <br /> The LUFT Manual was primarily developed for regulatory agency personnel <br /> who would be supervising site cleanup operations at gasoline tank cleanup <br /> operations. While the manual does include cleanup level recommendations for <br /> cleanup of diesel spill sites, it does so by using the cleanup levels for <br /> gasoline multiplied by a factor of ten. Based upon our investigation of the <br /> site and the laboratory analysis of substances at the site, existing site .soil <br /> conditions most probably do not pose an environmental or health risk to the <br /> surrounding community, and Dames & Moore will propose a cleanup level based on <br /> both the LUFT manual and the site-specific risk analysis contained herein. <br /> t <br /> The results of remedial site investigations were examined to establish an <br /> understanding of the site conditions. and the extent of soil contamination. <br /> This included a review of laboratory results from on-site soils and <br /> groundwater in order to determine an appropriate indicator chemical for the <br /> environmental and health assessment. This analysis included a review of <br /> available health and/or environmental criteria for chemical species on-site to <br /> choose the most sensitive applicable or relevant and appropriate (ARAB) <br /> regulation, criteria, or standard. <br /> The site conditions were then reviewed to determine the potential pathways <br /> of exposure to substances present in on-site in soils for both environmental <br /> 4-1 <br /> GGA/0179b <br />