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' Quarterly Report - Second Quarter 2002 <br /> FIVE STAR MARINA <br /> 345 Yosemite Street, Stockton, CaMornia <br /> 1 <br /> 1.0 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 348 Yosemite Street,Stockton,California The <br /> ' scope of work included measuring ground water elevations and sampling six ground water monitoring <br /> wells for laboratory analysis The objective of the investigation was to monitor hydrocarbon-impacted <br /> ground water at the site The site and its surroundings are illustrated on Figure 1 Structures, probe <br /> ' boring, soil sample and monitoring well locations are shown on Figure 2 The results of previous <br /> ground water monitoring events are included in the tables of this report <br /> S ite history and findings from previous investigations and previous monitoring events at the site were <br /> summanzed in Quarterly Report, 26 May 1998, prepared by AGE <br /> 1 <br /> 2.0. PROCEDURES <br /> MThe investigation was conducted in accordance with the Central Valley Regional Water Quality <br /> Control Board(CVRWQCB)and the San Joaquin County Environmental Health Department (EHD) <br /> ' guidelines for the subsurface investigation of underground storage tank(UST)sites and sampling of <br /> ground water monitoring wells <br /> 2 1 WELL MONITORING AND EVACUATION <br /> On 07 June 2002, a Solinst water level meter was used to measure the depth to ground water in <br /> monitoring wells MW-1 through MW-5 and shallow well MW-UST relative to the tops of the well <br /> casings <br /> After ground water depth measurements were collected, the wells were purged using dedicated, <br /> disposable plastic bailers Between 5 0 to 5 6 gallons of water(a minimum of three casing volumes) <br /> were evacuated from wells MWA through MW-5, approximately 3 0 gallons of water were <br /> evacuated from MW-UST, located within the former UST excavation Ground water temperature, <br /> ' pH and conductivity (field parameters of ground water) were measured at 1- to 2-gallon intervals <br /> during purging using an Oakton water analyzer Field data and logs are included in Appendix A <br /> ' 2,2 GROUND WATER SAMPLE COLLECTION <br /> Water samples were collected from the monitoring wells using the dedicated plastic bailers after <br /> allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Immediately <br />