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` 626718 [REV 12/851 <br /> 7 <br /> HEA L T11 <br /> RCA <br /> FOR INTRA—COMPANY USES �p A8 %ft heft,-E""m+ ! N L <br /> �. J J ••'� ass " cwn riNIM penton TMO <br /> From Region or �R� <br /> jjp <br /> Department ENGINEERING RESEARCH • 2z A� TRR <br /> To Region or Department SAN 30AQUIN VALLEY REGION '9 9 199 7 <br /> FILE NO 402.331 �❑ FE <br /> RE LETTER OF M04 ^, Y <br /> pLK M@ fatbw-u R��Y <br /> SUBJECT Tracy Service Center RMWy FileUnderground Tank Investigation <br /> February 3, 1987 <br /> MIKE BENNETT: <br /> Attached is DER draft report 402.331-87.4. This report documents the <br /> results of a subsurface tank investigation, performed at your request, <br /> around a 1500 gallon gasoline storage tank located at the Tracy Service <br /> Center. Prior to the investigation, the tank had been partially excavated <br /> and exposed in preparation for removal. This investigation was initiated to <br /> ascertain whether hydrocarbons were present in the backfill soil surrounding <br /> the tank and, if present, to identify the types and concentrations of the <br /> hydrocarbon mixtures. <br /> Work done during the course of this study included drilling two exploratory <br /> borings (one at each end of the tank), soil and water sampling each boring <br /> and submitting selected soil and water samples to a certified laboratory <br /> for chemical analysis. A total. of 5 soil samples and 2 water samples were <br /> submitted for analysis. <br /> Field observations and analytical results of the tested soil and water <br /> samples suggest that the fuel tank is leaking. Furthermore, the presence of <br /> gasoline floating on the ground water, as noted in both borings, indicates <br /> that free product has intercepted the water table. <br /> Lead was also present in all of the soil and water samples tested. Ethylene <br /> Dibromide (EDB) was nondetectable in all the soil and water samples <br /> analyzed. <br /> Please contact myself or Larry A. Flora (551-5441) of my staff if you have <br /> any questions concerning the results of this investigation. <br /> LFlora(551-5441):lf <br /> 1582A/mrp7 <br /> cc w/attach: DGAday w/o attach: HKMcCluer <br /> SChaewsky CBScott <br /> MRLafferty <br /> . RAMcCurdy <br /> LEMcMillan <br /> LSwanson <br />