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IQuarterly Report - Third Quarter 2001 COMFORT AIR, INC. .el 1607 Turnpike Road, Stockton, CaliformahU00 $ P� ZZ 5 L.O. INTRODUCTION At the request of Mr Greg Gaut, Advanced GeoEnvTronmental, Inc (AGE) has prepared this quarterly report for Comfort Au-,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 The objective oftheworkwas to monitor dissolved petroleum hydrocarbon concentrations in ground water and to characterize groundwater flow direction and gradient on the site This report is prepared in accordance with guidelines established 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 ' Ground water monitoring and sampling was performed at the site on wells MW-1 through MW-8 on 08 August 2001 ' Field activities were performed in accordance with guidelines for investigation of underground storage tank (UST) sites and sampling ground water monitoring wells established by the Regional Water Quality Coucrol Bawd - C eul'al`'alley Regioi�. (RWQCB) mud ley the San Joaquin Coanty ' Public Health Services - Environmental Health Division (PHS-EHD) 21 MONITORING WELL PURGE PROCEDURES Ground water sampling of the on-site wells was conducted on 08 August 2001 For the sampling ' event, a Solinst 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 depth to ground water measurements, a minimum of 3 casing-water volumes was purged from each well to be sampled using a PVC submersible two-stage pump Approximately six to twenty-two ' gallons ofwater were removed from wells MW-1 through MW-8 Temperature,pH and conductivity of purged ground water were measured at 1- to 5-gallon intervals using a Hydac or Oakton water analyzer The field data and field sheets are included m 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 1 Advanced GeoEnvuonmental,Inc 1