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I! y • 07 ,lune 2002 AGE-NC Project No_ 95-0185 Page 2 of 6 collected from the monitoring wells during the January 2002 quarterly monitoring event (Tables 4 and 5); ethylbenzene and total xylenes were detected in the ground water sample from well MW-4 at concentrations of 1.1 pg/l and 0.83 pg/l, respectively . Additional site history and findings from previous site investigations are detailed in the AGE-prepared Preliminan=.Investigation and Evaluation Report, dated 15 August 1996,and the Quarterly Report-- Fourth Quarter 2001, dated 02 January 2002. 3.0. SCOPE OF WORK The scope of work will consist of the following tasks: • Permitting, planning and pre-field work activities; - • Drilling and well installation; • Performance of an 24-week ozone sparge pilot test; • Preparation of a report on the results of well installation activities and the in-situ ozone sparge feasibility study. 3.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES Applicable site assessment permits will be submittedto the San Joaquin County Environmental Health Department (EHD) and 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 drilling activities, each proposed drilling location-will be clearly marked and a utility clearance obtained through Underground Service Alert. 3.2. WELL INSTALLATION Based on soil and groundwater data-collected during the investigation of p_etroleum_hydrocarbon impact, AGE proposes installation of wells in the following areas:T - • One 2-inch diameter ground water monitoring well(MW-5) located approximately 40 to 50 feet southwest of MW-2 and screen intervals at depths between 15 and 30 feet bsg; and. Advanced GeoEnvironmental,Inc.