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• y <br /> Chuck Carmel <br /> Page 2 <br /> which facilitate contamination migration. Such conduits must be <br /> properly destroyed to prevent migration of contamination. Either <br /> verify that the septic system has been destroyed or follow the <br /> proper procedures for its destruction. Enclosed is the permit <br /> application for the installation of the septic system. Due to the <br /> location of the leach lines, soil borings off-site will be <br /> necessary in order to investigate possible petroleum migration. <br /> Furthermore, within the "Problem Assessment Report" it is noted <br /> that through March 1987, a total of 19,842,800 gallons of <br /> groundwater had been discharged to the storm drain. A subsequent <br /> "Quarterly Report" dated July 1989, prepared by Brown and Caldwell <br /> indicated that some time in April 1989, the recovery pump stopped. <br /> The January 1990 "Quarterly Report" prepared by Brown and Caldwell <br /> stated that the increase in benzene concentrations in some wells <br /> "could be the result of solubilization of product from the soil". <br /> Water levels had increased .3 feet between June 1989 and December <br /> 1989, during which time the recovery system pump was non- <br /> operational. It is likely that until the soil contamination of the <br /> site is addressed, the groundwater remediation system proposed and <br /> in operation will simply mask the petroleum contamination of the <br /> site. Please submit the Addendum to the "Draft Final Remediation <br /> Plan" to PHS/EHD and Central Valley Regional Water Quality Control <br /> Board (CVRWQCB) within 90 days from the date of this letter. <br /> If you have any questions, contact Mary Meays, EHS, of my staff at <br /> (209) 468-3441. <br /> Jogi Khanna .D. , M.P.H. <br /> Health O ce(r <br /> aurz A. Co ulla, REHS, Prog m Manager <br /> ,Environmental Health Division <br /> LAC/MM:nr <br /> c: CVRWQCB - Elizabeth Thayer <br /> c: Brown and Caldwell - Steve Misner <br /> 723 S Street, Sacramento, CA 95814-7092 <br /> c: City of Stockton, Municipal Utilities - Frank Tucker <br /> 2500 Navy Drive, Stockton, CA 95206 <br /> c: City of Stockton <br /> Community Development Bldg. Division <br /> Ray Jiminez <br /> 6 E. Lindsay, Stockton, CA <br />