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Quarterly Report W August 1999 <br /> 1Five Star Marina <br /> 345 Yosemite Street, Stockton, California <br /> ' 10. INTRODUCTION <br /> ' At the request of Mr Terry McDonald of the Five Star Marina,Advanced GeoEnvironmental, Inc <br /> (AGE) has prepared the enclosed Quarterly Report for 345 Yosemite Street, Stockton, California <br /> The scope of work included measuring ground water elevations and sampling six ground water <br /> ' monitoring wells for laboratory analysis The objective of the investigation was to monitor <br /> hydrocarbon-impacted ground water at the site The site and Its surroundings are illustrated on Figure <br /> ' l Structures, probe boring, soil sample and monitoring well locations are shown on Figure 2 <br /> Site history and findings from previous investigations and previous monitoring events at the site <br /> twere summarized in Quarterly Report, 26 May 1998,prepared by AGE <br /> ' 2 0. PROCEDURES <br /> The investigation was conducted in accordance with the Central Valley Region of the Regional <br /> • Water Quality Control Board (CVRWQCB) and the San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) guidelines for the subsurface investigation of <br /> underground storage tank (UST)sites <br /> 21 GROUND WATER MONITORING AND SAMPLING <br /> ' On 03 August 1999 a Solinst water level meter was used to measure the depth to round water in <br /> g � P g <br /> each well relative to the tops of the well casings <br /> After ground water depth measurements were collected,monitoring wells MW-1 and MW-3 through <br /> ' MW- 6 were purged using a two-stage submersible pump Well MW-2 was purged using a <br /> disposable bailer Approximately 6 gallons of water were evacuated from each well Temperature, <br /> pH and conductivity (field parameters of ground water) were measured at 2-gallon intervals using <br /> ' an ICM model 52200 water analyzer Field data and logs are included in Appendix A <br /> ' 22 GROUND WATER SAMPLE COLLECTION <br /> After purging, ground water levels in the monitoring wells achieved a minimum of 80 percent <br /> ' recharge prior to sample collection Water samples were collected from each purged well using new, <br /> • clean, disposable plastic bailers Immediately upon retrieval, samples were transferred into chilled <br /> ' Advanced GeoEn,ironmentat,Inc <br /> 1 <br />