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Quarterly Report - Fourth Quarter 2004 Former OCAMPO PROPERTY ' 821 South Wilson Way, Stockton, California ' 1.0. INTRODUCTION At the request of Mr Victor Aranda,Advanced GeoEnvironmental, Inc (AGE) has prepared this ' quarterly report for the property located at 821 South Wilson 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 is illustrated on Figure 1, structures, former underground storage tank (UST) locations, and soil boring and monitoring well locations are Illustrated on Figure 2 ' This report was prepared in accordance with Central Valley Regional Water QualityControl Board ' (CVRWQCB)guidelines for the Investigation of UST sites Site historyand findings from previous investigations and monitoring events are provided in Appendix A ' 2.0. PROCEDURES l Field work was performed in accordance with guidelines established by the CVRWQCB for the ie Investigation of UST sites Ground water monitoring procedures were performed as outlined in the Revised Work Plan Addendum, dated 18 July 2002 and approved by the San Joaquin County ' Environmental Health Department (EHD)In a letter dated 23 July 2002 21 WELL MONITORING AND EVACUATION On 11 October 2004, 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 inertial pump and dedicated tubing Approximately 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 at regular intervals using an Oakton water analyzer Field data logs are provided in Appendix C Purged water was containerized in properly labeled,Department of Transportation(DOT)-approved 55-gallon drums and stored on- site 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Water samples were collected from each monitoring well using dedicated tubing after allowing the • ' wells to achieve a minimum 80%recovery of the pre-purge water volume The samples from each ' Advanced GeoEnvironmental,Inc