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1 <br />' Quarterly Report - Second Quarter 2004 <br /> • COMFORT AIR, INC. <br />' 1607 Turnpike Road, Stockton, California <br />' 1.0. INTRODUCTION <br /> At the request of Mr Greg Gaut, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br />' quarterly report of environmental activities conducted at Comfort Air, Inc , 1607 Turnpike Road, <br /> Stockton, California(site) The scope of work included a quarterly ground water monitoring event <br /> and preparation of this report The objective of the work was to monitor dissolved petroleum <br />' hydrocarbon and fuel additive concentrations in ground water and to characterize ground water flow <br /> direction and gradient on the site The Iocation of the site is illustrated in Figure 1 A plan of the site <br /> is illustrated in Figure 2 <br /> This report is prepared in accordance with guidelines issued by the Central Valley Regional Water <br />' Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites A <br /> summary of environmental assessment activities is included in Appendix A Historical ground water <br /> monitoring results are summarized on Tables 1 through 3 <br /> 2.0. PROCEDURES <br /> • Field activities were performed in accordance with guidelines for investigation of underground <br /> storage tank(UST) sites and sampling ground water monitoring wells issued by the Central Valley <br /> Regional Water Quality Control Board(CVRWQCB)and by the San Joaquin County Environmental <br /> Health Department (EHD), respectively <br /> 2 1 QUARTERLY WELL MONITORING <br /> On 17 June 2004, the second quarter ground water monitoring event was conducted at the site A <br /> total of fifteen wells were monitored and sampled <br />' 2 1 1 Well Monitoring and Evacuation <br /> A Solinst water level meter was used to measure the depth to ground water in wells MW-3,MW-5, <br /> I MW-6, MW-7, MW-8A/B through MW-12A/B and EX-1 relative to the tops of the well casings <br /> (Table 1) After the depth-to-ground-water measurements,a minimum of three casing-water volumes <br /> of water was purged from each well using dedicated,disposable plastic bailers for wells MW-7 and <br /> MW-8A through MW-12A and a Watera Hydro-Lift II pump for the remaining wells Approximately <br /> 4 25 to 14 gallons of water were removed from shallow-screened wells MW-3, MW-5, MW-7 and <br /> MW-8A through MW-12A and approximately 7 to 22 gallons of water were removed from deep- <br /> screened wells MW-8B, MW-10B through MW-12B and EX-1 Wells MW-6 and MW-9B were <br /> IAdvanced GeoEnvironmental,Inc <br /> I <br />