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RECEIVED - ' <br /> �F. _ O'C� 0 7-1992 <br /> a <br /> ENViRDNtViENTAL HEALTH <br /> M!T y9 .4V19FS Working to Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Phone:(209) 838-3507 <br /> FAX:(209)838-3509 <br /> October 6, 1992- <br /> Ms. Mary Meays <br /> San Joaquin Co. Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> RE: Site'Code 1203; Stockton Regional. Wastewater Treatment Facility, 2500 W. <br /> Navy Drive, Stockton, California. <br /> Dear Ms. Meays: <br /> This letter is to serve as a formal request for closure of,the above referenced site (Figure 1). . <br /> Analytical results from groundwater samples collected on June 24,_1992, indicate no petroleum <br /> hydrocarbon constituents are present in the groundwater underlying the site. These results are <br /> consistent with previous quarterly sampling rounds which began in October, 1989. A review <br /> of the site's groundwater analytical 'data collected from the subject site indicates benzene has <br /> E. never been detected above the method detection.limit of 0.5 parts per billion (ppb). Analytical <br /> results for groundwater are summarized in 'Table 1. <br /> As discussed. in RESNA Industries (RESNA) Quarterly Report dated August 14, 1992, soil <br /> ., samples collected from Borings S134, SB5, and SB6 'exhibited very low levels of toluene, <br /> ethylbenzene and.xylenes. No benzene was detected in any soil samples collected at the site. <br /> Total petroleum hydrocarbons as diesel (TPHD) were detected'in boring SB4 (near.the former <br /> tank) at only 1.9 ppm. Analytical results for soil samples are-summarized. in Table 2. <br /> .All residual aromatic constituents detected in the soils of the subject site are well below the State <br /> of California's Primary Maximum Contaminant Levels (MCL's) established for drinking water. <br /> TPHD, a heavy hydrocarbon, detected near the'method .detection. limit (1.0 ppm) in .SB4 has <br /> relatively non-mobile characteristics in fine grained soils such as those encountered at the subject <br />' site (i.e. silts and clays). The relatively low permeability of these soil types, which occur to a <br /> depth of 25. feet (the maximum depth explored) should limit the rate of vertical migration. In <br /> Y QRTLYRPT\LA090992.rNL <br /> E <br />