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r — <br /> r ` <br /> ! <br /> 10 September 2009 <br /> AGE-NC Project No. 09-1714 <br /> Page 2 of 5 <br /> I <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 sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground <br /> Water Basin(Basin 5-22). The estimated depth to ground water at the site is approximately 40 to 50 <br /> feet below surface grade(bsg)based on information from Lines ofEqual Depth of Water Wells Fall <br /> 1999,published by the San Joaquin County Flood Control District and Water Conservation District- <br /> FCD&WCD. Based on the map titled Lines of Equal Elevation of Groundwater Spring 1999 also <br /> published by the San Joaquin County FCD&WCD, the local ground water elevation is generally <br /> toward the east. However, this may be greatly modified by local recharge and discharge patterns. <br /> k <br /> 2.2. PREVIOUS ENVIRONMENTAL INVESTIGATIONS <br /> In May 1995 one 2,000-gallon underground storage tank (UST), two 1,1000-gallon USTs and one <br /> 500-gallon UST were removed from the site. The USTs were reportedly used for storage of waste <br /> oil associated with the adjacent shop,diesel fuel and leaded gasoline.At the time of the removal,all <br /> four tanks were observed to be rusted, three in "fair condition" and one in "good condition". Two <br /> of the tanks were observed to have visible holes,and the other two reportedly had"no visible holes." <br /> Additionally, in 2008, surface spillage of hydraulic fluid occurred near the northwest corner of the <br /> subject area. It is AGE's understanding that shallow soil in the effected are was excavated and <br /> disposed off-site. <br /> 3.0. SCOPE OF WORK <br /> l <br /> AGE proposes to advance nineteen soil probe borings for collection of soil samples. The <br /> investigation will include the following tasks: <br /> • Permitting and pre-field work activities; <br /> • Concrete cutting for boring advancement within the mechanic's pit; <br /> • Probe boring advancement; i <br /> • Soil sample collection and analysis; <br /> • Report preparation. <br /> Advanced GcoEnvironmental,Inc. <br />