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' Quarterly Report - February 1999 <br /> Five Star Marina <br /> 345 Yosemite Street, Stockton, California <br /> ' 1.0. INTRODUCTION <br /> At the request of Mr Terry McDonald of the Five Star Marina,Advanced GeoEnvironmental, Inc <br /> t (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 /> 1 Structures, probe bonng, 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 /> were summarized in Quarterly Report, 26 May 1998, prepared by AGE <br /> 2.0. PROCEDURES <br /> 1 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 26 February 1999, a Solinst water level meter was used to measure the depth to ground water in <br /> each well relative to the tops of the well casings <br /> 1 After ground water depth measurements were collected, monitoring wells MW-1 through MW- 6 <br /> were purged using a two-stage submersible pump Approximately 6 gallons of water were evacuated <br /> ' from each well Temperature,pH and conductivity(field parameters of ground water)were measured <br /> at 2-gallon intervals using an ICM model 52200 water analyzer Field data and logs are included in <br /> Appendix A <br /> 1 <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 /> AdvancedCeoEn%iron mental,Inc <br /> i 1 <br />