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Quarterly Report - Fourth Quarter 2002 <br /> LODITHEATER <br /> 107 North School Street, Lodi, California <br /> 1.0. fNTRODUCTION <br /> At the request of Mr Edward Barkett of Lodi City Center 12 LLC,Advanced GeoEnvzronmental, <br /> Inc (AGE) has prepared this report of environmental activities at 107 North School Street, Lodi, <br /> California A soil-vapor extraction monitoring and sampling event was conducted on <br /> 28 October 2002 and a ground water monitoring event was conducted on 13 January 2003 The <br /> location of the site and Its surroundings are illustrated in Figure 1 Structures and well locations <br /> associated with the site are depicted in Figure 2 <br /> I <br /> Background information and previous site investigation activities were descn`bed in the AGE- <br /> prepared Corrective Action Plan, dated 10 June 1999 <br />' 2.0 PROCEDURES <br /> Field procedures for ground water monitoring and sampling, and soil vapor extraction monitoring are <br /> described below All field work was performed in accordance with Central Valley Regional Water <br /> Quality Control Board(CVRWQCB)guidelines for investigation ofunderground storage tank(UST) <br /> sites, ground water sampling was conducted In accordance with guideline for monitoring well <br /> sampling issued by the San Joaquin County Environmental Health Department (E1=1D) <br /> I2 1 WELL MONITORING AND EVACUATION <br /> On 13 January 2003, a Solmst water level meter was used to measure the depth to gi ound water in <br /> I monitoring wells MW-2 and MW-4 through MW-8 relative to the tops of the well casings The <br /> ground water elevations and gradient were determined from these data (Table 1) <br /> After recording water level measurements, a dedicated disposable bailer was used to purge each <br /> monitoring well of standing water Between 6 and 7 gallons of water (a minimum of 3 casmg-well <br /> water volumes)were removed from each well Ground water temperature,pH and conductivity were <br /> measured at regular intervals during purging using an Oakton water analyzer Field sheets and data <br /> are included in Appendix A Purged water was stored on-site in labeled, 55-gallon, DOT-approved <br /> drums <br /> 22 COLLECTION OF GROUND WATER SAMPLES <br /> • Water samples were collected from the monitoring wells using the dedicated disposable plastic bailers <br /> after allowing the wells to achieve a minimum 80% recovery of the pre-purge water volume Each <br /> Advanced GeoEnvironmentai,Inc <br />