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! i . 28 February 2000 AGE-NC Project No 00-0697 Page 3 of 6 2 4 GROUND WATER DEPTH AND FLOW DIRECTION Based on the location, the estimated depth to ground water in the vicinity of the site is 5 feet below surface grade (bsg) The prevailing ground water flow direction in the vicinity of the site is inferred to be toward the Mokelumne River west of the site However, flow direction may be both locally and seasonably variable 3.0. SCOPE OF WORK Based on the results of the UST removal soil sampling, an unauthorized release of petroleum hydrocarbon compounds from the gasoline USTs has been determined to have occurred at the site AGE proposes to collect soil samples and in-situ grab ground water samples to evaluate the lateral and vertical extent of hydrocarbon impacted soil and ground water The preliminary site assessment will consist of the following tasks • Permitting and pre-field work activities, • Soil sample collection and analysis, • Ground water sample collection and analysis, and • Report preparation 3 1 PRE-FIELD WORK ACTIVITIES A health and safety plan will be prepared in accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration, U S Coast Guard and U S Environmental Protection Agency, 1985) Pnor to mobilization,the area to advance three soil probe borings will be clearly marked and a utility clearance obtained through Underground Service Alert 32 SOIL SAMPLE COLLECTION AND ANALYSIS Initially, AGE proposes to advance four soil probe borings in the vicinity of the former USTs to assess the lateral and vertical extent of the petroleum hydrocarbon impacted soil and/or ground water Proposed probe boring locations are illustrated in Figure 2 and are as follows • Boring 1 (B1) will be located within the former UST pit Advanced GeoEnvironmental,Inc