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Quarterly Report - Second Quarter 2004 <br /> • FIVE STAR MARINA <br /> t345 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 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, soil borings and <br /> 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)guidelines forthe subsurface investigation of underground storagetank <br /> (UST) sites and the San Joaquin County Environmental Health Department (EHD) guidelines for <br /> 1 the sampling of ground water monitoring wells <br /> ' 2 1 WELL MONITORING AND PURGING <br /> On 22 April 2004, 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 /> rAfter ground water depth measurements were collected, wells MW-1 through MW-5 were purged <br /> using dedicated, disposable plastic bailers, and well MW-UST was purged with a Waterra check <br /> bailer Between 5 0 and 5 5 gallons of water(a minimum of three casing volumes)were evacuated <br /> from wells MW-1 through MW-5 and approximately 2 5 gallons of water were evacuated from <br /> MW-UST Ground water temperature,pH and conductivity(field parameters of ground water)were <br /> ' measured at I to 2 gallon Intervals during purging using an Oakton water analyzer Field data and <br /> logs are 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 W aterra 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 /> ' Advanced GcGEnWonmental,Inc <br />