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31 March 2000 AGE-NC Project No. 00-0699 Page 3 of 9 semi-consolidated alluvium,lake,playa and terrace deposits of Quaternary age(California Division of Mines and Geology, 1977). 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). 2.5. GROUND WATER DEPTH AND FLOW DIRECTION During the Espana investigation, groundwater was encountered at a depth of approximately 59 feet bsg.Based upon the map Lines of Equal Elevations of Depth to Ground Water-Fall 1998,prepared by the San Joaquin County Flood Control Agency,the prevailing ground water flow direction in the. vicinity of the site is to the west-southwest. However, flow direction may be both locally and seasonably variable. 3.0. SCOPE OF WORK Based on the results of the CalTrans soil boring investigation,an unauthorized release of petroleum hydrocarbon compounds from the former fuel 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; • Installation of ground water monitoring wells, if appropriate; 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). Prior to mobilization,the area of investigation will be clearly marked.and a utility clearance obtained Advanced GeoEnvi ron mental,Inc.