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I ' Quarterly Report - Third Quarter 2004 LODITHEATER ' 107 North School Street, Lodi, California ' 1.0. INTRODUCTION At the request of Mr Edward Barkett of Lodi City Center 12 LLC,Advanced GeoEnvironmental, ' Inc (AGE) has prepared this report of environmental activities at 107 North School Street, Lodi, California Soil-vapor extraction/in-situ air sparging (SVE/IAS) monitoring and sampling events ' were performed between December 2003 and September 2004 and a ground water monitoring event was conducted in September 2004 The location of the site and Its surroundings are illustrated on Figure 1 Structures and well locations associated with the site are depicted on Figure 2 Background information and previous site investigation activities were described in the AGE- prepared Corrective Action Plan, dated 10 June 1999 I 2.0. PROCEDURES Field procedures for ground water monitoring and sampling, and soil-vapor extraction monitoring are described below All field work was performed in accordance with Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for investigation of underground storage tank (UST) sites Ground water sampling was conducted in accordance with guidelines for monitoring well sampling Issued by the San Joaquin County Environmental Health Department (EHD) r 2 1 WELL MONITORING AND EVACUATION IOn 10 September 2004, a Solinst water level meter was used to measure the depth to ground water in monitoring wells MW-2 and MW-4 through MW-8 relative to the top of the well casing(Table 1) After recording the water level measurement, a dedicated disposable bailer was used to purge the monitoring wells of standing water Approximately 2 25 to 3 75 gallons of water(a minimum of 3 casing-well water volumes) were removed from the wells 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 A Purged water was stored on-site in labeled, 55- gallon, Department of Transportation (DOT)-approved drums I 22 COLLECTION OF GROUND WATER SAMPLES Water samples were collected from the monitoring wells using the dedicated disposable plastic bailers after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water sample was transferred into 40-m1 volatile organic analysis (VOA) vials containing • 0 5 ml 18% hydrochloric acid as a sample preservative The samples were properly labeled, placed IAdvanced GeoEnvzronmental,Inc