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Quarterly Report - Fourth Quarter 2005 ARROYO SMOG SHOP I3012 East Waterloo Road, California I1.0. INTRODUCTION At the request of Ms Erlinda Hernandez,Advanced GeoEnvfronmental, Inc (AGE) has prepared this quarterly monitoring report for the property located at 3012 East Waterloo Road, Stockton, California The site and surrounding area are illustrated on Figure 1, structure, boring, and well locations are illustrated on Figure 2 Site background information is summarized in Appendix A ' Analytical data for soil analysis and ground water can be found in Tables 2 and 3, respectively ' 2.0. PROCEDURES The quarterly ground water monitoring event was performed on 04 November 2005, ground water monitoring was performed on monitoring wells MW-1 through MW-3 Field work was performed in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board Ifor the investigation of underground storage tank(UST) sites 2 1 WELL MONITORING AND EVACUATION The depth to ground water in each monitoring well was measured from the top of the well casing to I the nearest 0 01-foot utilizing a Sollnst 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) IAfter water levels were measured,between 5 5 and 6 gallons of water(a minimum of 3 casing-water � volumes per well)were purged from monitoring wells MW-1 through MW-3 using a Waterra inertia pump with dedicated tubing in each well Ground water temperature, pH, and conductivity were measured at regular intervals during purging using an Oakton water analyzer Field sheets and data are included in Appendix C Purged water was stored on-site in properly labeled, 55-gallon, Department of Transportation (DOT)-approved drums 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES I Water samples were collected from each well using the inertia pump after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water sample was transferred into laboratory-supplied 40-milliliter (ml) volatile organic analysis (VOA) vials containing 0 5 ml I hydrochloric acid solution as preservative, and one 1-liter amber bottle without preservative After collection, the samples were properly labeled, placed in a chilled container, and transported under chain-of-custody to CTEL for analysis The samples were analyzed for Advanced GeoEnvironmeptal,Inc