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RECOVED <br /> OCT 0 7 1992 ����� <br /> ENVIRONMENTAL HEALTH <br /> rOWorking 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 /> 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 SB4, SBS 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 S134 (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 Iimit (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 a 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 />• <br /> QRTLYRPT1LA090992 rNL <br />