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SECOR www.secor.com <br /> INTERNATIONAL <br /> S E C O R INCORPORATED 3017 Kilgore Road,Suite 100 <br /> Rancho Cordova,CA 95670 <br /> 916-661-0400 TEL <br /> f 3� 916-861-0430 FAX <br /> September 3, 2004 � E11 ME D <br /> SEP I 0 2004 <br /> SannJoa Michael <br /> nfurna Count Public Health Services ENVIRONMENT HEALTH <br /> Joaquin Y PERMIT/SERVICES <br /> Environmental Health Division <br /> 304 East Webber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Re: Well MW-13 Reinstallation Report <br /> 76 Service Station (Former BP) 11195 <br /> 16500 South 1-5 <br /> Lathrop, California <br /> J <br /> SECOR Project 77CP.60195.00 <br /> Dear Mr. Infurna: <br /> SECOR International Incorporated (SECOR) has prepared this letter on behalf of ConocoPhillips to <br /> document the successful reinstallation of well MW-13 at the site referenced above (Figure 1). During <br /> the first quarter 2004 quarterly monitoring and sampling event, ConocoPhillips sampling contractor <br /> (TRC) noted that the well had been damaged. During examination of the well by SECOR personnel, <br /> it appeared that the well, completed above-grade with a stove pipe finish had been damaged by a 1 <br /> tractor. The stove pipe was completely bent over and it appeared that several feet of well casing had <br /> come up the borehole compromising the well seal. This report includes a brief discussion of site <br /> background and previous investigations, completed scope of work, and conclusion, <br /> SITE BACKGROUND AND PREVIOUS INVESITGATIONS <br /> A retail gasoline outlet has been located at the subject site since at least 1983. BP Oil Company (BP) <br /> acquired the site from Mobil Oil Corporation in 1989, then sold the site to Tosco in 1994 (Alisto, <br /> Additional Site Investigation Report, dated January 25, 1999). <br /> Five onsite groundwater monitoring wells (MW-1 through MW-5)were installed in December 1992. Soil } <br /> samples collected from the well borings were reported to contain petroleum hydrocarbons at <br /> concentrations of up to 120 parts per million (ppm) of Total Petroleum Hydrocarbons as gasoline ' <br /> (TPHg), and 16 ppm of benzene. The initial groundwater samples collected from wells MW-3 and <br /> MW-4 contained concentrations of up to 10,000 parts per billion (ppb) of TPHg (Alisto, 1999). <br /> Two additional wells (MW-6 onsite and MW-7 offsite) were installed in September 1993. Soil samples <br /> collected at a depth of 6 feet below ground surface (bgs) were non-detect for petroleum hydrocarbons <br /> (Alisto, 1999). J <br /> One 550-gallon fiberglass waste ail UST and associated remote fill line were removed in 1997. One soil <br /> sample was collected from the bottom of the waste oil UST excavation at 10 feet bgs. A second soil <br /> sample was collected from beneath the remote fill line at 3 feet bgs. Both samples were non-detect for ; <br /> petroleum hydrocarbons (GeoStrategies, Waste Oil UST and Remote Fill Line Soil Sampling Report, <br /> dated August 6, 1997). ' <br /> s <br />