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Mr. Brian Miller - 2 - 19 September 2003 <br /> cleanup levels for soil and groundwater based on the health risk assessment(HRA), and <br /> designated levels for soil for the constituents of concern at the site. As Table 1 shows,the WQO <br /> and designated levels are lower than the HRA cleanup levels with one exception. The HRA <br /> cleanup level for Endosulfan I and II for soil is lower than the designated level. Therefore, the <br /> HRA cleanup level for Endosulfan I and II for soil, the WQOs, and the designated levels for all <br /> other constituents in soil are the cleanup goals for the site. <br /> The Letter provides a site status update and proposes to submit the next semi-annual groundwater <br /> monitoring report and identification of wells in the vicinity of the site by 1 November 2003. <br /> Regional Board staff concurs with the proposed work and schedule in the Letter. The next <br /> semi-annual report needs to include a schedule proposing further delineation work, if needed, and <br /> submittal of a feasibility study report. If you have any questions, you may contact me at <br /> (916) 255-3119 or lewisd@rb5s.swrcb.ca.gov. <br /> —Q..fl1t.O <br /> DEVRA LEWIS <br /> Environmental Scientist <br /> Attachment <br /> cc: Mr. Michael Infurna, San Joaquin County Environmental Health Department, Stockton <br /> Ms.Nancy Bishop, Agrium, Lafayette <br /> Ms. Carolyn Kneiblher, GeoSyntec Consultants,Walnut Creek <br />