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Quarterly Report - June 1998 <br /> COMFORT AIR, INC. <br /> 1607 Turnpike Road <br /> Stockton, California <br /> I1.0. INTRODUCTION <br /> IIn accordance with a request from Mr Greg Gaut of Comfort Alar,Advanced GeoEnvironmental, Inc <br /> (AGE) has prepared this Quarterly Report for 1607 Turnpike Road, Stockton, California The <br /> I location of the site and the immediately surrounding area are illustrated on Figure 1 Site structures <br /> and monitoring well locations are depicted on Figure 2 <br /> I The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water and to characterize ground water flow direction and gradient on the site This report is <br /> prepared in accordance with guidelines established by the San Joaquin County Public Health <br /> I Services - Environmental Health Division (PHS-EHD) and the Central Valley Regional Water <br /> Quality Control Board (CVRWQCB) for investigation of underground storage tank(UST) sites A <br /> summary of previous investigations at the site was included in the Quarterly Report - February <br /> I1997, dated 18 April 1997, prepared by AGE <br /> 2.0. PROCEDURES <br /> 21 MONITORING WELL PURGE PROCEDURES <br /> IOn 23 June 199$ the depth p to ground water in each monitoring well (MW-1 through MW 5) was <br /> I measured to the nearest 0 01-foot utilizing a Solist water level meter Ground water elevations from <br /> MW-1 through M W-5 were then calculated by subtracting the measured depth to ground water from <br /> the surveyed casing elevations (Table 1) Ground water elevations were plotted and contoured on <br /> Ia scaled site map (Figure 3) <br /> Following depth to ground water measurements, Mr Harlin Knoll of the PHS-EHD reviewed the <br /> I ground water monitoring data and recommended that only well MW-3 be sampled during this <br /> monitoring event Subsequently, approximately rune gallons(a minimum of three well volumes) of <br /> water was purged from well MW-3 utilizing a two-stage submersible pump Temperature, pH and <br /> conductivity were measured at regular purge-volume intervals using an ICM Model 52200 water <br /> analyzer, to monitor for stabilization of these characteristics Stabilization data and field logs are <br /> included with Appendix A Purged ground water was containerized in 55-gallon drums and stored <br /> Ion-site in an area lacking general public access <br /> Advanced GeoEnvcronmental,Inc <br />