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28 June 2007 <br />AGE-NC Project No. 06-1481 <br />Page 2 of 5 <br />alluvium, lake, playa and terrace deposits of Quaternary age (California Division of Mines and <br />Geology, 1977). Rocks composing the basement complex of the Province have not been completely <br />defined but are believed to be metamorphic and igneous in origin. <br />The Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are the <br />principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground <br />Water Basin (Basin 5-22). Based on a Fourth Quarter 2006 monitoring event at a property less than <br />an eighth of a mile to the south-southwest from the site, Top Filling, 101 Wilson Way, Stockton, <br />California, depths to ground water ranged from 37.98 and 40.60 feet below the top of the casing <br />(btoc). The shallow and deep ground water was inferred to flow generally toward the northeast. <br />However, this may be greatly modified by local recharge and discharge patterns. <br />2.2. UNDERGROUND STORAGE TANK REMOVAL <br />A 22,000-gallon fuel oil tank (Fuel Oil #6) located approximately 35 feet from the northeast corner <br />of the western-most building on Parcel 153-040-03 was filled in-place in 1986. A 1,000-gallon UST <br />was removed from the southeast corner of the western building on Parcel 03 in 1986; soil <br />contamination was found to be immediately below the tank and soil was over-excavated in the area <br />of the tank. Confirmation sampling noted non-detect for all analytes and the site was closed by San <br />Joaquin County Environmental Health in 1996. <br />2.3. PREVIOUS SITE ASSESSMENTS <br />An AGE-prepared Phase 1 Preliminary Findings, dated 03 November 2006, identified: former above <br />ground and underground storage tank areas, a former hydraulic scale location, a former oil depot, <br />and former in-ground separators. <br />3.0. SCOPE OF WORK <br />AGE proposes to advance a series of soil borings in order to collect grab ground water and/or soil <br />samples. The phase II site assessment will include the following tasks: <br />Permitting and pre-field work activities; <br />Grab ground water and/or soil sample collection and analysis; <br />Report preparation <br />Advanced GeoEnvironmental, Inc.