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' Quarterly Report - Second Quarter 2005 • VANCO TRUCK& AUTO PLAZA ' 1033 West Charter Way, Stockton, California - ' s 1.0. INTRODUCTION At the request of Mr David Atwater of Van De Pol Enterprises,Advanced GeoEnvironmental,Inc- - ', (AGE) has prepared this Quarterly Report - Second Quarter 2005 for the property located at 1033 West Charter Way, Stockton, California(site) The scope of work included the performance ' of a quarterly ground water monitoring event, submission of monitoring and analytical data to'the State Water Resources Control Board's GeoTracker Information management system, and preparation of this report The location of the site and surrounding area are illustrated on Figure 1, ' structures, soil borings, and monitoring well locations are illustrated on Figure 2 Background Information, including details of previous site assessment work, is presented in Appendix A ' 2.0. PROCEDURES ' Field work was conducted In accordance with guidelines established by the Central Valley Regional Water Quality Control Board (CVRWQCB) and the San Joaquin County Environmental Health Department(EHD)for the subsurface investigation of underground storage tank(UST)sites and the sampling of ground water monitoring wells, respectively 2 1 WELL MONITORING AND EVACUATION On 25 May 2005, a Solinst water level meter was used to measure the depth to ground water In ' monitoring wells MW-1 through MW-3 relative to the tops of the well casings After the depth to ground water measurements were collected, casing water In each monitoring well was evacuated using a Waterra Inertia pump and dedicated tubing Approximately 7 to 7 5 gallons of water were evacuated from each of the monitoring wells, equivalent to three casing water volumes per well Temperature, pH, and conductivity of the purged water were measured for stability at regular ' Intervals using an Oakton water analyzer Field data logs are provided in Appendix B Purged water " was containerized in properly labeled, Department of Transportation (DOT)-approved 55-gallon drums and stored on-site pending proper disposal 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Ground water samples were collected from each monitoringwell using a Waterra,mertia pump and dedicated tubing after allowing the well to achieve a minimum 80%recovery of the pre-purge water volume The samples from each well were transferred Into three 40-milliliter(ml) volatile organic . analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid solution as a sample preservative,and Advanced GcoEnvironmental,Inc