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. Momtormg Well Installation Report - Former Chevron Service Station #9 5775 <br />June 2, 1999 <br />• <br />City of Lodi municipal well #12 is located 600 feet southwest (crossgradient) of the subject site This well <br />is screened in the deep water bearing zones (210 to 500 feet bgs) and has a grout annular seal at 108 feet <br />bgs that prevents interconnection of shallow and deep water bearing zones In addition, the boring log <br />of well #12 indicates that the soil materials separating the shallow water bearing zone (at 55 feet bgs) and <br />the production zones consist mostly of clay (150 -foot thick clay section with three 3- to 4 -foot thick sand <br />interbeds) Therefore, the probability of the hydrocarbon plume from the subject site impacting municipal <br />well #12 appears to be low The laboratory analytical results confirm that municipal well #12 has not been <br />impacted by MtBE <br />7.0 REFERENCES <br />R W Page, 1986, Geology of the Fresh Ground -Water Basin of the Central Valley, California with <br />Texture Maps and Sections U S Geological Survey Professional Paper 1401-C <br />Gettler-Ryan Inc , November 10, 1998, Soil Sampling During Underground Storage Tank and Piping <br />Removal at Former Chevron Service Station #9-5775, 301 West Kettleman Lane, Lodi, California, Report <br />No 346408 02 <br />Gettler-Ryan Inc , November 24, 1998, Work Plan for Monitoring Well Installation at Former Chevron <br />Service Station #9-5775, 301 West Kettleman Lane, Lodi, California, Report No 346408 04-1 <br />Gettler-Ryan Inc , January 11, 1999, Site Safety Plan for Former Chevron Service Station #9-5775, 301 <br />West Kettleman Lane, Lodi, California, Job No 346408 04 <br />34640804-2 <br />