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1 <br /> 1 Quarterly Report - First Quarter 2003 <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 Manna,Advanced GeoEnvironmental, Inc <br /> ' (AGE)has prepared the enclosed quarterly report 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 <br /> results of previous ground water monitoring events are included in the tables of this report <br /> 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 /> '. of ground water monitoring wells <br /> ' 2 1 WELL MONITORING AND PURGING <br /> On 31 January 2003, a Solmst 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 monitoring wells were purged using <br /> dedicated, disposable plastic bailers,however, well MW-UST was purged with a Waterra check- <br /> bailer Between five and six gallons of water(a minimum of three casing volumes)were evacuated <br /> from wells MW-1 through MW-5 while approximately three gallons of water were evacuated from <br /> MW-UST Ground water temperature,pH and conductivity(field parameters of ground water)were <br /> ' measured at 1-to 2-gallon intervals during purging using an Oakton water analyzer Field data and <br /> logs are included in Appendix B <br /> 1 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 />