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Quarterly Report - Second Quarter 2005 SUTTER OFFICE CENTER I242 North Sutter Street, Stockton, California I1.0. INTRODUCTION At the request of Ms Juh Lozano, Advanced GeoEnvironmental, Inc (AGE) has prepared this ' quarterly report for the property located at 242 North Sutter Street, Stockton, California(site) The scope of work included the performance of a second quarter ground water monitoring event and preparation of this report The location of the site and surrounding area are illustrated on Figure 1, structures, former underground storage tank (UST) and dispenser locations, and soil boring and monitoring well locations are illustrated on Figure 2 This report was prepared in accordance with California Regional Water Quality Control Board (CRWQCB) guidelines for the investigation of UST sites Site history and findings from previous investigations and monitoring events are provided in Appendix A 2.0. PROCEDURES Field work was performed in accordance with guidelines established by the CRWQCB for the investigation of UST sites Ground water monitoring procedures were performed as outlined in the AGE-prepared Additional Site Assessment Work Plan, dated 25 October 2002 2 1 WELL MONITORING AND EVACUATION EOn 16 June 2005, a Solinst water level meter was used to measure the depth to ground water in all three monitoring wells relative to the tops of the well casings After the depth to ground water measurements were collected, casing water in monitoring well MW-1 was evacuated using a Idedicated, disposable plastic bailer Approximately 4 gallons of water were evacuated from well MW-1, equivalent to three casing-water volumes of the 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 B Purged water was containerized Iin a properly labeled, Department of Transportation (DOT) 55-gallon drum and stored on-site ' 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES A water sample was collected from well MW-1 using a dedicated,disposable bailer after allowing Ithe well to achieve a minimum 80% recovery of the pre-purge water volume The sample from . MW-1 was transferred into three 40-milliliter(ml)volatile organic analysis(VOA)vials containing 0 5 ml 18% hydrochloric acrd solution as a sample preservative The sample was labeled with the Advanced GeoEnvironmentel,Inc I