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_ a E'3 PROBLEM ASSESSMENT REPORT Moore Petroleum, Inc. 1399 E. Yosemite Avenue, Manteca, CA HOA Project No. 10.90-480 Page 2 s Collection of grcund-water samples from all site monitoring wells. Ground-water samples were submitted to a California-certified laboratory and analyzed for BTEX, EDC, EDB, and TPH using EPA method 8260. • Collection of water level elevation data in July and August, 1990. 0 Preparation of a ground-water contour map depicting the elevation of the ground-water surface at the site in August, 1990. o Development of conceptual remediation plans for ground water and soil. 2.0 BACKGROUND INFORMATION 2.1 site setting The site is located at 1399 East Yosemite Avenue (Figure 2) at the intersection of Yosemite Avenue and Northwoods Drive in Manteca, Cali{ornia, The site is located in an area of mixed commercial and residential properties. The site is bordered on the East by Not-thwoods Avenue, to the North by a grocery store and small shopping complex, to the West by a fast-food restaurant, and to the South by Yosemite Avenue. Several private residences are located immediately South of the site, across Yosemite Avenue. Surface elevation at the site is about 40 feet above mean sea level (msl) . The surface is of low topographic relief and slopes gently to the southwest. Surface runoff flows into on-site drains (Figure 2) , and from there into storm sewers on Yosemite Avenue and Northwoods Drive. The service station lot is paved with asphalt except in the vicinity of the pump islands and underground storage tanks (USTs) , where the surface is concrete. Moore Petroleum, Inc. leases the site to Mr. Frank Guinta, Sr. , who has operated the site for the past ten years as a gas station/convenience store. Gasoline USTs at the site were removed and replaced in November, 1989. The locations of both the new and - replaced USTs at the site are shown on Figure 2. Table 1 presents information about the replaced and new tanks.