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' Quarterly Report - First Quarter 2001 <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 quarterly report for 345 Yosemite Street,Stockton,California The <br /> 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 groundwater at the site The site and its surroundings are illustrated on Figure <br /> I Structures, probe boring, soil sample and monitoring well locations are shown on Figure 2 The <br /> ' results of previous ground water monitoring events are included in the tables of this report <br /> Site history and findings from previous investigations and previous monitoring events at the site <br /> ' were summarized in Quarterly Report, 26 May 1998, prepared by AGE <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 EVACUATION <br /> On 30 March 2001, 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 5 gallons of water(a minimum of three casing volumes) <br /> were evacuated from wells MW-1 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-gallon intervals during <br /> purging using a Hydac water analyzer Field data and logs are included in Appendix A <br /> 22 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 />