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Quarterly Report - First Quarter 2002 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 for Comfort Air,Inc , 1607 Turnpike Road,Stockton,California(site) The location of the site is illustrated in Figure 1, a plan of the site is illustrated in Figure 2 IThe 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 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 of previous 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 2.0. PROCEDURES On 12 February 2002, ground water monitoring and sampling was performed at the site on wells • MW-1 through MW-8 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 Regional Water Quality Control Board-Central Valley Region(RWQCB) and by the San Joaquin County Environmental Health Department (EHD), respectively 2 1 WELL MONITORING AND EVACUATION A Solmst water level meter was used to measure the depth to ground water in the eight monitoring wells relative to the tops of the well casings, the ground water elevations and gradient were determined from these data(Table 1) After the depth-to-ground-water measurements, a minimum of 3 casing-water volumes of water was purged from each well using a PVC submersible two-stage pump or a new, clean, disposable plastic bailer Approximately six to twenty-two gallons of water were removed from wells MW-1 through MW-8 Temperature,pH and conductivity of purged ground water were measured at 1-to 4-gallon intervals using an Oakton water analyzer The field data and field sheets are included in Appendix A Purged water was temporarily stored on-site in 55-gallon DOT-approved H-17 storage drums pending proper disposal Following purging,the depth to ground water was measured to ensure that a minimum of 80%well- volume recharge had been achieved prior to sampling However, monitoring well MW-6, screened in a deeper zone, was sampled prior to reaching 80% recovery Advanced GeoEnvironmental,Inc