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I <br />' Quarterly Report - Third Quarter 2004 <br /> • PREM DOR <br /> I433 West Scotts Avenue, Stockton, California <br />' 10. INTRODUCTION <br /> At the request of Dr Olbrantz of Masonite International,Advanced GeoEnvironmental, Inc (AGE) <br />' has prepared this quarterly report for the property located at 433 West Scotts Avenue, Stockton, <br /> California(site) The site and the surrounding area are illustrated on Figure 1 Structures and boring <br />' and well locations are illustrated on Figure 2 Additional site background information is summarized <br /> in Appendix A <br /> I2.0 PROCEDURES <br /> On 28 September 2004,ground water monitoring was performed on monitoring wells MW-1 through <br /> MW-3 Field work was conducted in accordance with guidelines issued by the San Joaquin County <br /> Environmental Health Department (EHD) for the sampling of ground water monitoring wells and <br /> Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for the investigation <br /> of underground storage tank (UST) sites <br /> 2 1 WELL MONITORING AND EVACUATION <br /> I The depth to ground water in each monitoring well was measured from the top of the well casing to <br /> the nearest 0 01-foot utilizing a Sohnst water level meter Ground water elevation in each well was <br /> calculated by subtracting the measured depth to ground water from the surveyed casing elevation <br /> (Table 1) <br /> After water levels were measured, approximately 6 25 to 6 5 gallons of water(a minimum of three <br /> Icasing-water volumes per well) were purged from monitoring wells MW-1 through MW-3 using a <br /> dedicated Waterra hose bailer MW-1 drew down slightly during purging, but pumping rate was <br /> slowed and three volumes were able to be removed Ground water temperature,pH,and conductivity <br /> were measured at regular intervals during purging using an Oakton water analyzer Field sheets and <br /> data are included in Appendix B Purged water was stored on-site in properly labeled, 55-gallon <br />' Department of Transportation (DOT)-approved drums <br /> 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using a dedicated inertia pump hose after <br /> Iallowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water <br /> . sample was transferred into laboratory supplied, 40-milliliter(ml) volatile organic analysis (VOA) <br /> vials containing 0 5 ml 18% hydrochloric acid solution as a preservative, one-liter amber glass <br /> IAdvanced Geo Environmental,Inc <br />