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s ' Quarterly Report - Fourth 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 t 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 and fuel additive 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 This report is prepared in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board(CVRWQCB) for investigation of underground storage tank(UST) sites A summary ofprevious investigations at the site was included in the AGE-prepared Quarterly Report- February 1997,dated 18 April 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 10 2.0 PROCEDURES Field activities were performed in accordance with guidelines for investigation of underground ' storage tank(UST) sites and sampling ground water monitoring wells issued by the Central Valley Regional Water Quality Control Board(CVRWQCB)and bythe San Joaquin County Environmental Health Department (EHD), respectively 1 2 1 QUARTERLY WELL MONITORING On 22 December 2003,the fourth quarter ground water monitoring event was conducted at the site A total of fifteen wells were monitored and sampled 1 2 1 1 Well Monitoring and Evacuation A Solmst 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-12A/B and EX-1 relative to the tops of the well casings (Table 1) After the depth-to-ground-water measurements,a minimum of three casing-water volumes of water was purged from each well using dedicated, disposable plastic bailers for wells MW-7 and MW-8A through MW-12A and a Watera Hydro-Lift 11 pump for the remaining wells Approximately 4 to 14 gallons of water were removed from shallow-screened wells MW-3, MW-5, MW-7 and • MW-8A through MW-12A, approximately 5 to 21 gallons of water were removed from deep- screened wells MW-6 and MW-8B through MW-12B and 25 5 gallons were removed from well ' Advanced CeoEnvironmental,Inc 1