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� 1 IS November 2003 AGE-NC Project No. 03-1080 Page 2 of 6 valley(Olmsted and Davis, 1961);the site itself is located on unconsolidated and semi-consolidated alluvium, lake, playa and terrace deposits of Quaternary age (California Division of Mines and Geology, 1977).Rocks composing the basement complex of the Province have not been completely defined but are believed to be metamorphic and igneous in origin. The Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are the principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin(Basin 5-22). 2.2. UNDERGROUND STORAGE TANK PIPING REMOVAL In January 2003, AGE was present at the site during UST dispenser and piping excavation and upgrade activities, performed by Elite IV Contractors, Inc. of Stockton, California. Soil removed during the excavation was stockpiled on-site for soil disposal characterization. Soil samples were collected for laboratory analysis from the floor of the fuel dispenser and piping excavations, from a gravel pile, and from the soil stockpiles. The laboratory analysis detected total petroleum hydrocarbons as gasoline and diesel (TPH-g and TPH-d) and the aromatic compounds ethylbenzene and xylenes in the sample collected from dispenser D1, and TPH-d, toluene and xylenes in the dispenser D4 sample. In addition, the fuel additives methyl tert-butyl ether(MTBE) Jm. and tertiarybutanol(TBA)were detected in the sample collected from soil stockpile k h.Figure 2 depicts the approximate location of the sample collection points; analytical results are summarized in Table 1. The excavated soil was subsequently transported to Forward Landfill for disposal. 3.0. SCOPE OF WORK AGE proposes to collect soil and ground water samples to determine if petroleum hydrocarbon and/or MTBE-impacted soil and/or ground water is present beneath the site. The preliminary site assessment will include the following tasks: • Permitting and pre-field work activities; • Soil and grab ground water sample collection and analysis; • Report preparation The preliminary site assessment tasks are discussed below. advanced GeaEnvironmental,Inc.