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Mitigation Work Plan AGS 86102.2P <br /> Beacon Station #3-492, Manteca, California May 26, 1987 <br /> 4) a Generalized Site Plan, Plate P-2, showing the <br /> approximate locations of underground tanks, structures, <br /> moni;:oring wells, and proposed vapor recovery and air <br /> inlet wells. <br /> i <br /> 5) a ,Schematic Diagram of Proposed Soil Vapor Venting <br /> i System, Plate P-3. <br /> BACKGROUND <br /> The station investigated is located on the southeast corner of <br /> North Main Street and Alameda Street in Manteca. The site <br /> contains an underground storage t-nk cluster which consists of <br /> three 10,000 gallon tanks The central tank, which contained <br /> diesel fuel, failed a precision pressure test. The tanks have <br /> since been lined in situ. A sample taken from a boring drilled <br /> adjacent to the tank at a depth of 12 feet showed eontE-mination <br /> near, but less than, 1,000 parts per million (S-12-B5, Table 1) , <br /> Three monitoring wells have been drilled at the site (AGS Report <br /> 86102-1, dated December 16, 1986) and a soil vapor survey was <br /> done on February 24, 1987. The locations of the tank cavity, <br /> soil borings, and monitoring wells are depicted on the <br /> Generalized Site Plan, Plate P-2. <br /> Data obtained from these wells suggests that soil contamination <br /> is limited to the area immediately adjacent to'and below the tank <br /> ` cavity. Ground water has been contaminated by gasoline and <br /> 2 <br />