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28 December 1999 AGE-NC Project No, 97-0351 Page 4 of 7 2.4. REGIONAL GROUND WATER , The estimated depth to ground water at this property is approximately 20 feet bsg, based on information from Lines of Equal Depth of Water Wells, Fall 1995 published by the San Joaquin County Flood Control District and Water Conservation District. However, the PHS-EHD records indicted that the highest ground water was observed at the site in 198Cat 10 feet bsg. During previous site investigations at the site, ground water was encountered at a depth of 12 feet bsg. The prevailing ground water flow in this portion of western Stockton flows generally to the northeast, while localized ground water flow may vary during winter/summer cycles. 3.0. SCOPE OF WORK Based on the laboratory analysis of soil samples collected and field observations noted during UST removal, soil boring advancement and monitoring well installation,petroleum hydrocarbon impacts to soil were located in the former West UST area. The proposed interim soil remediation scope of work will include the following'tasks: • Pre-field work activities; • Soil excavation and backfilling; • Soil sample collection and analysis; (stockpile sample collection and analysis) • Soil disposal and-, • Installation of two wells with quarterly sampling • Report preparation. Each of these tasks is described in greater detail below. 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 excavation will be clearly marked'and an utility clearance obtained through Underground Service Alert. Permits required from other agencies will be procured. Advanced 6eoEnvironmental,Inc.