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' May 1, 1998 Page 5 PD-3, PD-5, and PP-5 were reported as weathered gas, while soil sample PD-1 was ' reported as unidentified hydrocarbons TEPH-d was reported as unidentified hydrocarbons in three piping samples Sample PD-4 contained the highest levels of ' BTEX compounds but the levels of concentration decreased with depth as indicated by sample PD-4@12' Trace concentrations of MtBE were detected in samples PD-5, PP-2, and PP-3 through PP-5 Sample DPD,contained non-detectable concentrations of ' all constituents Soil sample results for the product dispensers and piping are presented in Table 2 ' Soil analytical data for the stockpiled soils are presented in Table 3 All stockpiles were accepted at Forward Landfill However, SP-I, which was sampled on February 4, 1998, was reused as backfill The analytical results showed non-detectable concentrations of ' all parameters, with the exception of 21 ppm weathered TEPH-d ' EXCAVATION BACKFILL , , Upon completion of the removal of the USTs, one 12,000-gallon capacity and three I 0,000-gallon capacity USTs were installed within the same excavation The ' replacement USTs are of double-walled fiberglass construction The replacement fuel_ tanks are fitted with automatic annular space leak detection monitoring Upon completion of the removal of the product dispensers and associated underground product piping, new dispensers and underground piping were installed in approximately the same locations The replacement underground piping is of double-walled fiberglass r construction, and is fitted with automatic leak detection monitoring ' DISTRIBUTION A copy of this letter should be sent to the following Mr Harlin Knoll San Joaquin County Public Health Services 304 East Weber Avenue, Third Floor Stockton, California 95202 Mr Michael Kith San Joaquin County Public Health Services 304 East Weber Avenue, Third Floor Stockton, California 95202 3111791 A/501LP EP I