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l Quarterly Report - Third Quarter 2004 Former PACIFIC AUTO CENTER 25355 North Highway 99, Acampo, California ' 1.0. INTRODUCTION At_the request of Mr Pat Meeks, Advanced GeoEnvironmental, Inc (AGE) has prepared this ' quarterly report for the property located at 25355 N Highway 99, Acampo, California The scope of work included domestic well sampling,quarterly ground water monitoring and preparation of this report The location of the site and the immediately surrounding area is illustrated on Figure 1 ' Structures and monitoring well locations are illustrated on Figure 2 An expanded site plan,including the locations of four down gradient domestic wells is shown-in Figure 3 Background information ' is summarized in the AGE-prepared Preliminary Site Assessment Report,dated 07 April 1999 Data from previous ground water monitoring events are included in Tables 1 and 2 2.0. PROCEDURES ' Field activities were performed in accordance with guidelines for the investigation of underground storage tank (UST) sites and the sampling of ground water monitoring wells as issued by the Regional Water Quality Control Board- Central Valley Region(CVRWQCB)and the San Joaquin County Environmental Health Department (EHD), respectively 2 1 WELL MONITORING AND EVACUATION On 15 September 2004, a Solinst water level meter was used to measure the depth to ground water in wells MW-I and MW-2,relative to the tops of.the well casings, well MW-3 was dry On 20 September, a steel bailer was utilized to remove accumulated sediment from and redevelop MW-3 On 22 September 2004, a Solinst water level meter was used to measure the depth to ground water in wells MW-1, MW-2 and MW-3 relative to the tops of the well casings Monitoring well MW-3 was developed further using a steel bailer and MW-1 'was purged using a steel bailer to remove excess fine sediments in the bottom of the well Ground water elevations and gradient were determined from the data collected on 22 September 2004 (Table 1) After depth to ground water measurements, approximately 3 0 gallons and 3 25 gallons of water(a I minimum of 3 casing-water volumes per well) were purged from monitoring wells MW-2 and MW-3, respectively, and 1 0 gallon of water was purged from well MW-1 before the well was purged dry- The wells ,were purged using dedicated, disposable plastic bailers Ground water temperature,pH and conductivity were measured at regular intervals during the purge process using an Oakton water analyzer Field data sheets are included in Appendix A Purged water was stored Ion site in appropriately jabeled, 55-gallon Department of Transportation (DOT)-approved drums Advanced GeoEnvironmental,Inc 1 , h l f