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rQuarterly Report - Fourth Quarter 2004 <br /> GUARDINO AND CRAWFORD <br />' 517 West Fremont Street, Stockton, California <br /> 1.0. INTRODUCTION <br /> At the request of Dave and Pat Guardino of Guardino and Crawford Construction, Advanced <br />' GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report- Fourth Quarter 2004 for the <br /> property located at 517 West Fremont Street,Stockton,California(site) The scope of work included <br /> the performance of a quarterly ground water monitoring event, submission of monitoring and <br /> analytical data to the State Water Resources Control Board's GeoTracker information management <br /> System, and preparation of this report The site and surrounding area are illustrated on Figure 1 <br /> Structures, soil borings, and monitoring well locations are illustrated on Figure 2 Additional site <br />' background information is provided in Appendix A <br />' 2.0. PROCEDURES <br /> t Field work was conducted in accordance with guidelines issued by the Central Valley Regional <br /> Water Quality Control Board(CVRWQCB)for the investigation of underground storage tank(UST) <br /> sites and San Joaquin County Environmental Health Department(EHD)guidelines for the sampling <br />' of ground water monitoring wells <br /> 2 1 WELL MONITORING AND EVACUATION <br /> On 15 December 2005, a Solinst water level meter was used to measure the depth to ground water <br /> to the nearest 0 01-inch in monitoring wells MW-I through MW-8 relative to the tops of the well <br /> casings The ground water elevations and gradient were determined from these data(Table 1) After <br /> recording water level measurements, dedicated disposable plastic bailers were used to evacuate <br />' (purge)monitoring wells MW-1 through MW-8 of standing water Approximately 3 to 8 gallons of <br /> water(equivalent to three casing-water volumes per well)were removed from wells MW-1 through <br /> MW-4 and MW-6 through MW-8, monitoring well MW-5 drew down after 3 25 gallons of water <br />' were evacuated <br />' Ground water temperature,pH,and conductivity were measured for stabilization at regular intervals <br /> during purging using an Oakton water analyzer Purged water was stored on-site in properly labeled, <br /> Department of Transportation (DOT)-approved 55-gallon drums pending proper disposal Field <br />' sheets and data are included in Appendix B x �� <br />' 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Prior to collection of ground water samples, the depth to ground water was re-measured in each <br />' Advanced GeoEnvironmental,Inc <br />