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TI <br /> 1 r <br /> II r <br /> Quarterly Report - July 1998 <br /> I Five Starr Marina <br /> 345 Yosemite Street,Stockton, California <br /> i <br /> I <br /> 1.4. INTRODUCTION <br /> I1 At the request of Mr Terry McDonald of the Five Starr Marina,Advanced GeoEnvironmental, Inc <br /> l (AGE) has prepared the enclosed Quarterly Report for 345 Yosemite Street, Stockton, California + r' <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 boring, soil sample and monitoring well locations are shown on Figure 2 <br /> The investigation was conducted in accordance with the Central Valley Region of the Regional <br /> Water Quality Control Board(CV-RWQCB) and the San Joaquin County Public Health Services- <br /> IEnvironmental Health Division (PHS-EHD) guidelines for the subsurface investigation of <br /> underground storage tank (UST) sites <br /> Site history and findings from previous investigations and previous monitoring events at the site <br /> were summarized in the Quarterly Report dated 26 May 1998 prepared by AGE <br /> i } 2.0. PROCEDURES <br /> I 1 2 1 GROUND WATER MONITORING AND SAMPLING <br /> On 28 July 1998,a Solinst water level meter was used to measure the depth to ground water in each <br /> well relative to the tops of the well casings <br /> IAfter 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 /> 1 at 2-gallon intervals using an ICM model 52200 water analyzer Field data and logs are included in <br /> Appendix A <br /> Il <br /> l <br /> 22 GROUND WATER SAMPLE COLLECTION <br /> 1 After purging, ground water levels in monitoring wells achieved a minrmum of 80 percent recharge <br /> prior to sample collection Water samples were collected from each purged well using new, clean, <br /> ,I 1 disposable plastic bailers Immediately upon retrieval, samples were transferred into chilled 40-m1 <br /> EPA-approved VOA vials containing 0 5 ml hydrochloric acid (18%) as a sample preservative <br /> l A&ancad GeoEnvaronmentnI,Inc <br /> IJ <br /> `� 1 <br />