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The brass tubes were sealed with plastic end caps and Teflon tape; labeled in accordance with <br /> �..• EPA protocol; recorded on a chain-of-custody(COC)form; stored in a pre-cooled ice chest at 41 <br /> degrees Centigrade; and shipped to Sierra Laboratories (Sierra), a California certified analytical <br /> laboratory for analysis. Strict COC protocol was maintained throughout the sample handling <br /> process. <br /> All samples were analyzed for total petroleum hydrocarbons in the gasoline range(TPH G; EPA <br /> Method 8015M), benzene, toluene, ethylbenzene, toluene, and xylenes(BTEX;EPA Method <br /> 8020) and methyl-tert-butyl-ether(MTBE;EPA Method 8020). All product line samples, spoils <br /> piles samples and two samples from the excavation(EXC-1 and EXC-9) were analyzed for lead <br /> (EPA Method 6010). Lead analysis results are consistent with background Ievels. Additional soil <br /> analysis for fuel additives(EPA Method 8260)was performed on sample EXC-3 to confirm the <br /> presence of MTBE. The County also requested analysis for TBA, ETBE, TAME, and DIPE, fuel <br /> additives used in addition to MTBE. Soil sample results are summarized in Tables 1, 2 and 3. <br /> Laboratory results and COC documentation are included in Attachment A. <br /> Approximately 320 cubic yards(cy) of soil was removed during product line retrofit and UST <br /> overburden and 230 cy of soil was removed during over-excavation activities, which was disposed <br /> of by USA at Forward Landfill. Forward Landfill collected spoils pile samples(SP-A through D <br /> and SP-E through H) at their facility in Manteca. <br /> Monitoring well S-1 was damaged and repaired during field activities. With the concurrence of <br /> the County, GHH grouted S-1 following restoration of the UST field. <br /> `r <br /> Soil sample data indicate that there is impacted soil remaining on-site. The pump island samples <br /> have the highest TPH G concentrations in the location of samples P-4, P-5 and P-8. In the UST <br /> excavation impacted soil was detected in all samples collected. The highest TPH G <br /> concentrations were detected in samples 1-EXC through 4-EXC, 12-EXC and 14-EXC. <br /> The tank retrofit program conducted and the removal of impacted soil may qualify this site as low <br /> risk and a candidate for site closure. If you have any questions or need additional information, <br /> please call the undersigned at (916) 723-7645. <br /> Thank you, <br /> LL 4V <br /> Vern A Bennett <br /> Project Manager <br /> Zc0hardV4Zipp <br /> Principal Hydrogeologist <br /> F:\5059.14\KVAnaJ\Exc.rpt <br /> ;*■' Attachment(s) <br /> PC: Mr. Harlan Knoll, San Joaquin County Public Health Services <br />