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t r Quarterly Report - Second Quarter 2004 Former PACIFIC AUTO CENTER ' _ -25355 North Highway 99, Acampo, California ; 1.0. INTRODUCTION x At the request of Mr Pat Meeks, Advanced GeoEnvironmental, Inc (AGE) has prepared this rquarterly report for the property located at 25355 N Highway 99, Acampo, California The scope F 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 28 June 2004, a Sollnst water level meter was used to measure the depth to ground water in the three wells relative,to the tops of the well casings The ground water elevations and gradient were determined from this data(Table 1) After depth to ground water measurements, between 4 and 5 25 gallons of water (a minimum of 3,casing-water volumes per well) were purged from monitoring wells MW-1, MW-2 and MW-3 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 on site-in appropriately labeled, 55-gallon Department of Transportation (DOT)-approved drums 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES A water sample was collected from each purged well using the dedicated, disposable bailers Each Iwater sample was transferred into laboratory-supplied 40-m1 volatile organic analysis (VOA) vials . containing 0 5 ml 18%hydrochloric acid as a sample preservative After collection,the samples were properly labeled,placed in a chilled container and transported under chain of custody to a California Advanced GeoEnvironmental,Inc