ARCHIVED REPORTS_MONITORING WELL INSTALLATION REPORT - SITE ASSESSMENT WORK PLAN

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t ' 25 February 2005 AGE-NC Project No. 98-0500 Page 5 of 6 ' 3.1. PRE-FIELD WORK ACTIVITIES The following procedures will be performed prior to any drilling activities: • Prepare a Site Health and Safe Plan in accordance with the Occupational Safe and Health p Safety p Safety Guidance Manual for Hazardous Waste Site Activities - Prepared by National Institute for ' Occupational Safety and Health,Occupational Safety and Health Administration,U.S.Coast Guard and U.S. Environmental Protection Agency, October 1985. ' • Notify the San Joaquin County Environmental Health Department EHD a minimum of 48 hours prior to commencement of any work,while securing proper city/county soil boring or well permits. AGE will notify the CVRWQCB a minimum of 72 hours prior to commencement of any work. • All drilling locations will be marked at least 48 hours in advance for an Underground Service Alert (USA) check of underground utilities or pipes. '• 3.2. PILOT BORINGS AND MONITORING WELL INSTALLATION ' Multi-level monitoring well pilot borings will be advanced utilizing a truck-mounted,hollow-stem drill rig equipped with 8.25-inch diameter hollow-stem augers, with a 4-inch interior diameter. Cuttings generated during drilling activities will be stockpiled and rinseate will be containerized in properly labeled Department of Transportation(DOT)-approved 55-gallon drums,and stored on-site in an area lacking public access. Disposal alternatives will be evaluated based on results of soil and water analysis. 3.2.1. Multi-Level Ground Water Monitoring Well Completion ' Five soil pilot borings will be established (drilled)to the proposed 200 feet bsg for completion as `multi-level' ground water wells. This will allow for the completion of the well in the deepest ' interval which has demonstrated 1,2-DCA and TPH contamination. Each `multi-level' well will be completed in a single soil boring utilizing 1.7-inch outer diameter ' polyethylene tubing containing segregated vertical chambers that can be individually completed as monitoring wells at different depths. The inner tubing consists of seven '/z-inch diameter or four larger diameter Teflon tubes partitioned into separate chambers running the length of the casing. Each multi-level well casing will be prefabricated prior to installation with the proposed perforated intervals; a stainless steel 0.02-inch screen will be wrapped around four 3/8-inch perforation of the ' tubing for each screen interval. Advanced GeoEnvironmental,Inc.