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Quarterly Report - Third Quarter 2003 COMFORT AIR,INC ' 1607 Turnpike Road, Stockton, California ' 1.0. INTRODUCTION At the request of Mr Greg Gaut, Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report of environmental activities conducted at Comfort Air, Inc , 1607 Turnpike Road, Stockton, California(site) The scope of work included a quarterly ground water monitoring event and preparation of this report The objective of the work was to monitor dissolved petroleum ' hydrocarbon concentrations in ground water and to characterize ground water flow direction and gradient on the site The location of the site is illustrated in Figure 1 A plan of the site is Illustrated in Figure 2 1 This report is prepared to accordance with guidelines issued by the Central Valley Regional Water • Quality Control Board(CVRWQCB) for investigation of underground storage tank(UST) sites A ' summary of previous investigations at the site was included in the AGE-prepared Quarterly Report- February 1997,dated 18 Apnl 1997,and Monitoring Well Installation Work Plan-July 1998, dated 23 July 1998 A summary of environmental assessment activities is Included in Appendix A ' Historical ground water monitoring results are summarized on Tables 1 through 3 ' . 2.0. PROCEDURES Field activities were performed in accordance with guidelines for investigation of underground t storage tank(UST) sites and sampling ground water monitoring wells issued by the Central Valley Regional Water Quality Control Board(CVRWQCB)and by the San Joaquin County Environmental Health Department (EHD), respectively • 2 1 QUARTERLY WELL MONITORING ' On 24 September 2003, the third quarter ground water monitoring event was conducted at the site A total of fifteen wells were monitored and sampled 2 1 1 Well Monitoring and Evacuation ' A Solznst water level meter was used to measure the depth to ground water in wells MW-3,MW-5, MW-6, MW-7, MW-8A/B through MW-12AB and EX-1 relative to the tops of the well casings ' (Table 1) After the depth-to-ground-water measurements, a minimum of 3 casing-water volumes of water was purged from each well using dedicated, disposable plastic bailers for wells MW-7 and MW-8A through MW-I 2 and a Watera Hydro-Lift IT pump for the remaining wells Approximately ' 4 to 13 5 gallons of water were removed from wells MW-3, MW-5, MW-6, MW-7 and MW-8A through MW-12A, approximately 20 to 21 gallons of water were removed from wells MW-8B through MW-12B and 43 gallons were removed from well EX-1 ' Advanced Geo Environmental,Inc