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25 July 2003 AGE -NC Project No. 03-1063 Page 3 of 5 alluvial plain, which extends from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively. Rocks composing the basement complex of the province have not been completely defined but are believed to be of metanlorphic and igneous origin. The Great Valley Province has been subdivided into two major divisions identified as the Sacramento and San Joaquin Valleys. 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). This basin is drained primarily by the San Joaquin River. 3.0. SCOPE OF WORK Based on the laboratory analysis of soil samples collected and field observations noted during UST removal, petroleum hydrocarbon impacts to soil appear to be located immediately west of the of the former fuel UST, beneath the former dispenser island. 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; • Soil stockpile sample collection and analysis; • 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.