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[alRAMCON <br /> Engineering&Environmental Contracting <br /> P.O.Box 1026 <br /> West Sacramento, CA 95691 <br /> Tel.(916)372-7535 Fax:(916)372-4209 <br /> June 22, 2004 <br /> San Joaquin County Public Health <br /> Environmental Management Department <br /> Attention: Jeffrey Wong(Tele: 209 468-0335) <br /> 304 East Weber, 3'Floor <br /> Stockton, CA 95202 <br /> SUMMARYREPORT <br /> ADDITIONAL SOIL AND GROUNDWATER INVESTIGATION <br /> Former Underground Fuel Tank Site <br /> 2005 Navy Drive <br /> Stockton, California <br /> INTRODUCTION <br /> Ramcon has completed the soil and groundwater investigation detailed in the approved Work Plan <br /> dated October 1, 2003. This report presents the results of our investigation. <br /> The approximate location of the site is shown on the attached Plate 1, Vicinity Map. Monitor well <br /> locations are shown with respect to former tank and earlier sampling locations on Plate 2, Site Plan. <br /> Logs of the monitor well borings are shown together with well construction details on Plates 3 <br /> through 6. Summary chemical data are presented on Tables 1 and 2. Laboratory data reports are <br /> presented in the Appendix. <br /> BACKGROUND <br /> In 1987 an approximate 1000-gallon waste oil and a 12,000-gallon diesel tank were removed from <br /> the site. A field sketch noted in the County (SJCEMD) file generally shows the tanks formerly <br /> located as shown on the attached Plate 2. Limited available test data indicate that volatile aromatic <br /> (BTEX) compounds were detected in soil from beneath the south end of the diesel tank, and that <br /> low-level polychlorinated biphenyls were reported in the soil sample from beneath the waste-oil <br /> tank. The excavations have been backfilled and concrete flatwork is now present at each of the <br /> former tank locations as approximately shown on Plate 2. <br /> In October 1999 Ramcon was retained to perform soil and water sampling at the six locations shown on <br /> Plate 2. The summary data table from the described investigation is attached at the end of the Appendix <br /> for convenience. The test data indicated that none of the soil samples contained measurable petroleum <br /> hydrocarbons with the exception of Sample B-2-3 which revealed a trace of oil at a concentration of 12 <br /> parts-per-million(ppm). Metals were detected in the soil samples at very low concentrations, below <br /> Ramco n H:\WPDATA\1303-2-Andenson\REPORTS\SumReport.wpd Page 1 <br />