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September 11, 2000 ' 50441 Mr. Vidal Pedraza Harding Lawson associates San Joaquin County Public Health Service ' Environmental Health Division (PHS/EHD) Page 5 ' Soil Sampling Sample locations are shown on Plate 3. Samples were collected from the excavation in accordance with Page ' 7, Sampling Protocol for Routine Tank Removals of the PHS/EHD application package, and as directed by Mr. Pedraza (PHS/EHD) who picked the sample locations and depths. One sample was collected from beneath each UST at the southern fill end of the USTs. The samples were collected from approximately 3 ' feet beneath the tank inverts at a depth of approximately 9.5 feet bgs. As directed by PHS/EHD, the backhoe bucket was used to collect soil from 3 feet below the tank inverts. HLA collected the sample from the backhoe bucket, after removing the top 3- to 6 -inches of soil, with a clean brass sample sleeve and a rubber ' mallet. As directed by PHS/EHD, one (4:1) field composite was collected from the sand removed from the tanks (SP1A,B,C,D) and one (4:1) field composite was collected from the potential backfill soil pile (SP2A,B,C,D). ' Immediately after collection, the samples were capped with Teflon -lined plastic end -caps, labeled, and placed in an ice -chilled cooler for transport to a state -certified analytical laboratory. Samples were recorded ' on a standard HLA chain -of -custody form to document sample identification and handling. All samples were submitted for the analyses listed below in the Analytical Program section. ' ANALYTICAL PROGRAM ' Samples were analyzed in accordance with page 8, Minimum Verification Laboratory Analysis from the PHS/EHD permit application package. Although the USTs were reportedly used to contain gasoline, because of the uncertain usage history, the analytical suite was that specified for an unknown fuel. These analyses included the following: ' TPHd with EPA Method 8015M, ' TPHg and BTEX with EPA Method 826013, • Lead with EPA Method 7420, and ' Five fuel oxygenates including methyl tertiary butyl ether (MTBE), tertiary butyl alcohol (TBA), di - isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), and tertiary amyl methyl ether (TAME) with EPA Method 8260B. ' All sample were analyzed in accordance with the above program with the exception of the composite sample of the tank sand stockpile (SP1A,B,C,D). This sample was analyzed as above, except it was not analyzed for all five fuel oxygenates, but only for MTBE. ANALYTICAL RESULTS ' The results of the analyses on the UST removal and stockpile samples are listed in Table 1. Copies of the chain -of -custody form and the laboratory analytical reports are attached to this report as Appendix A. Copies of the laboratory analytical reports were mailed directly to Mr. Pedraza of the PHS/EHD by Kiff Analytical. ' For the UST removal samples (Tank East, Tank Middle, and Tank West(1/2)) and the stockpiled native soil backfill composite sample (SP1A,B,C,D), none of the analytes TPHg, TPHd, BTEX, MTBE, TBA, DIPE, 1 0