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r ' Quarterly Report - Fourth Quarter 2004 • PREM DOR 433 West Scotts Avenue, Stockton, California I1.0. INTRODUCTION At the request of Dr Sonya Olbrantz of Masonite International,Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for the property located at 433 West Scotts Avenue, Stockton,California(site) The site and the surrounding area are illustrated on Figure 1 Structures, borings, and well locations are illustrated on Figure 2 Additional site background information is summarized in Appendix A ' 2.0. PROCEDURES ' On 21 December 2004,groundwater monitoring was performed on monitoring wells MW-1 through MW-3 Field work was conducted in accordance with guidelines issued by the San Joaquin County Environmental Health Department (EHD) for the sampling of ground water monitoring wells and I Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for the investigation of underground storage tank (UST) sites • 2 1 WELL MONITORING AND EVACUATION I The depth to ground water in each monitoring well was measured from the top of the well casing to the nearest 0 01-foot utilizing a Solinst water level meter Ground water elevation in each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 1) After water levels were measured, a dedicated Waterra hose bailer was used to purge wells MW-2 and MW-3 of approximately 6 5 and 7 gallons of water(a minimum of three casing water volumes per well), respectively Well MW-1 drew down after 6 5 gallons of water had been purged Ground water temperature,pH,and conductivity were measured at regular intervals during purging using an IOakton water analyzer Field sheets and data are included in Appendix B Purged water was stored on-site in properly labeled, Department of Transportation(DOT)-approved 55-gallon drums I 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Water samples were collected from each purged well using a dedicated inertia pump hose after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water sample was transferred into three laboratory supplied, 40-milliliter (ml) volatile organic analysis (VOA) vials containing 0 5 ml 18%hydrochloric acid solution as a preservative, one 1-liter amber . bottle without preservative, and one 16-ounce plastic bottle containing 5 ml nitric acid as a sample IAdvanced GeoEnhronmental,Inc I