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' Quarterly Report - Third Quarter 2002 <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 /> (AGE)has prepared the enclosed quarterlyreport for 345 Yosemite Street,Stockton,California The <br /> scope of work included monitoring and sampling six ground water monitoring wells and preparation <br /> of this report The site and its surroundings are illustrated on Figure 1 Structures,probe boring,soil <br /> sample and monitoring well locations are shown on Figure 2 <br /> ' Site history and findings from previous site investigations are summarized in Appendix A,the results <br /> of previous ground water monitoring events are included in the tables of this report <br /> 1 2.0. PROCEDURES <br /> ' The 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 <br /> Ileof ground water monitoring wells <br /> ' 2 1 WELL MONITORING AND EVACUATION <br /> On 23 September 2002, a Solinst water level meter was used to measure the depth to ground water <br /> ' in monitoring wells MW-1 through MW-5 and shallow well MW-UST relative to the tops of the <br /> well casings <br /> ' After ground water depth measurements were collected, the monitoring wells were purged using <br /> dedicated, disposable plastic bailers, well MW-UST was purged with a waterra check-bailer <br /> Between five and six gallons of water(a minimum of three casing volumes) were evacuated from <br /> wells MW-1 through MW-5, approximately 3 gallons of water were evacuated from MW-UST <br /> Ground water temperature,pH and conductivity(field parameters of ground water)were measured <br /> at 1- to 2-gallon intervals during purging using an Oakton water analyzer Field data and logs are <br /> included in Appendix B <br /> ' 2 2 GROUND WATER SAMPLE COLLECTION <br /> ' Water samples were collected from the monitoring wells using the dedicated plastic bailers or the <br /> . dedicated waterra check-bailer, after allowing the wells to achieve a minimum 80%recovery of the <br /> pre-purge water volume Immediately upon retrieval, samples were transferred into chilled 40-m1 <br /> 1 <br /> 1 <br />