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1 ' <br /> Quarterly Report - First Quarter 2005 <br /> Former OCAMPO PROPERTY <br /> ' 821 South Wilson Way, Stockton,California <br /> 1.0. INTRODUCTION j <br /> At the request of Mr Victor Aranda,Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> ' quarterly report for the property located at 821 South Wilson Way, Stockton, California(site) The <br /> scope of work included the performance of a quarterly ground water monitoring event, submission <br /> of monitoring and analytical data to the State Water Resources Control Board's GeoTracker <br /> information management system, and preparation of this report The location of the site and <br /> surrounding'area is illustrated on Figure 1, structures, former underground storage tank (UST) <br /> locations, and soil boring and monitoring well locations are illustrated on Figure 2 <br /> This report was prepared in accordance with Central Valley Regional Water Quality Control Board <br /> ' (CVRWQCB)guidelines for the investigation of UST sites Site history and findings from previous <br /> investigations and monitoring events are provided in Appendix A <br /> 2.0. PROCEDURES <br /> ' • Field work was performed in accordance with guidelines established by the CVRWQCB for the <br /> investigation of UST sites Ground water monitoring procedures were performed as outlined in the <br /> Revised Work Plan Addendum, dated 18 July 2002 and approved by the San Joaquin County <br /> Environmental Health Department (EHD) in a letter dated 23 July 2002 <br /> 2 1 WELL MONITORING AND EVACUATION <br /> On 19 January 2005, a Solmst water level meter was used to measure the depth to ground water in <br /> ' monitoring wells MW-1 through MW-3 relative to the tops of the well casings After the depth to <br /> ground water measurements were collected, casing water in each monitoring well was evacuated <br /> using a Waterra inertial pump and dedicated tubing Approximately 5 gallons of water were <br /> tevacuated from each of the monitoring wells, equivalent to three casing water volumes per well <br /> Temperature,pH,and conductivity of the purged water were measured at regular intervals using an <br /> Oakton water analyzer Field data logs are provided in Appendix C Purged water was containerized <br /> in properly labeled,Department of Transportation(DOT)-approved 55-gallon drums and stored on- <br /> site <br /> 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> 1 Water samples were collected from each monitoring well using dedicated tubing after allowing the <br /> wells to achieve a minimum 80%recovery of the pre-purge water volume The samples from each <br /> ' Advanced GeoEnvironmentai,Inc <br />