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10 July 2007 <br /> AGE-NC ProIect No, 06-1524 <br /> Page 2 of 5 <br /> valley(Olmsted and Davis, 1961);the site itself is located on unconsolidated and semi-consolidated <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 source of domestic ground water in the 13,500-square-mile San Joaquin Valley Ground <br /> Water Basin (Basin 5-22). This basin is drained primarily by the San Joaquin River. The nearest <br /> surface water feature in the vicinity of the subject property is the Stockton Deep Water Channel.. <br /> approximately '/smile toward the south. <br /> The prevailing ground water flow direction in Stockton generally ranges from northeast to east, but <br /> this may be greatly modified by local recharge and discharge patterns.Ground water monitoring data <br /> taken at several nearby sites in 4`h Quarter 2006 showed shallow groundwater at 10 to 14 feet below <br /> surface grade (bsg) and with a general flow direction towards the northeast. Ground water is <br /> considered to be of beneficial use and is utilized for domestic, industrial and commercial purposes. <br /> 2.2. UNDERGROUND STORAGE TANK REMOVAL <br /> It is our understanding that one 1,000-gallon leaded gasoline underground storage tank (UST) was <br /> removed without permit in May 1990. Subsequently, the UST was permitted and the removal was <br /> brought into compliance. It does not appear that confirmation soil sampling was performed at the <br /> time of removal. <br /> 3.0. SCOPE OF WORK <br /> AGE proposes to advance a single soil borings near the former UST for collection of soil and grab <br /> ground water samples. The investigation will included 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 /> The site assessment tasks are discussed below. <br /> Advancer!GeoEnvironmental,Inc. <br />