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RAMCO1 A ; <br /> Engineering&Environmental Contracting,Inc. <br /> ENVIRONMENTAL HEALTH DIVISION <br /> P.O. Box 1026 304 E. Weber Ave. Third Floor <br /> 3751 Commerce Drive P. O. Box 38. S! on CA 95201-0388 <br /> West Sacramento,CA 95691 Approved <br /> ❑ - <br /> Phone (916) 372-7535 DeniedConditions <br /> Fax (916) 372-4209 <br /> Date <br /> T— / <br /> June 9, 1999 <br /> San Joaquin County Public Health <br /> A <br /> Environmental Management Department 14 1999 <br /> Attention: Jeffrey Wong (Tele: 209 468-0335) <br /> ENll;:-(.;;,, ,;I�„ TH <br /> -.- <br /> 304 East Weber, 3`d Floor pl`-:rVii , `,��;� <br /> Stockton, CA 95202 JUL 2 s 1999 <br /> WOR"LAN pETE(�r 11 CA,l ANAL y s Ls 6 i- PC B <br /> SOIL AND GROUNDWATER INVESTIGATION 2 . 5a6C'CXA1 o r 5AM P442�s r' <br /> Former Underground Fuel Tank Site R c yv&y$e D M U 5-r iN Cz_J0 6 <br /> 2005 Navy Drive FHSl -91 i 4 <br /> Stockton, California <br /> Ramcon Project No. 1070 <br /> w/ PHS%Ns) A7 <br /> INTRODUCTION i.CAS; A.�vAt.�C5 <br /> i�Z4 MUST CJ cwt 3Y Ste',' 2L; q . <br /> On behalf of Jack Anderson, we have prepared this workplan for the evaluation of subsurface <br /> conditions with respect to former underground tank usage. <br /> The approximate location of the site is shown on the attached Plate 1, Vicinity Map. Proposed soil <br /> and groundwater sampling locations are shown with respect to the former tank locations on Plate 2, <br /> Site Plan. Ramcon's Standard Procedures for subsurface investigation work are presented for <br /> reference 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 /> (BTX) compounds were detected in soil from beneath the south end of the diesel tank, and that low- <br /> level polychlorinated biphenyls were reported in the soil sample from beneath the waste-oil tank.. <br /> The excavations have been backfilled and concrete flatwork is now present at each of the former tank <br /> locations as approximately shown on Plate 2. We understand that no follow-up has been performed <br /> and that the SCEMD has required additional investigation. Our proposed investigation is detailed <br /> below. <br /> Ramco n H:\WPDATA\1070ANDS\InvestigationWP Page I <br /> aese No.4—.CC34 <br />