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Quarterly Report -- May 1997 COMFORT AIR 1607 Turnpike Road, Stockton, California 1.0 INTRODUCTION In accordance with the request of Mr Greg Gaut, Advanced GeoEnvironmental, Inc , (AGE) has prepared this Quarterly Report for the property at 1607 Turnpike Road, Stockton, California The report summarizes field work performed at the site during May 1997 A summary of previous investigations at the site was included in the Qucri terly Repo)t - Feb)ua)y 1997, dated 18 April 1997, prepared by AGE The location of the site and its surroundings are illustrated in Figui e I - Location Map A layout of the property is depicted in Figure 2 - Site Plaii This report is prepared in accordance with the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and the Central Valley Regional Water Quality Control ` Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites t2 0 QUARTERLY MONITORING PROCEDURES 2 1 MONITORING WELL PURGE PROCEDURES On 22 May 1997, the depth to ground water in each monitoring well was measured to the neat est 0 01 foot utilizing a Solinst water level meter The relative ground water ele-vaticns wei e calculated by subtracting the depth to ground water from the relative casing elevations surveyed from a temporary benchmark assigned an arbitrary elevation (Table I- Relative G)ound Wale) .ilei cmon) ) ' Relative ground water elevations were plotted and contoured on a scaled site map (Figure 3 - Relcitive Eleicition Ground Wate) Mop) After water levels were measured, approximately 12 to 15 gallons of ground water (a minimum of three well volumes) were removed from wells MW-1 through MW-5 with a two-stage submersible pump Temperature, pH and conductivity were measured at regular intervals from each well using an ICM model 52200 water analyzer, to monitor stabilization of these characteristics Stabilization data and field logs are included with Appendix A Purged ground water was containerized in 55- gallon drums and stored on-site in an area lacking access for the general public I2 2 GROUND WATER SAMPLING The ground water levels in monitoring wells MW-1 through MW-5, were allowed to iecover for a minimum of one hour prior to sample collection Water samples were collected utilizing disposable polyethylene bailers and new nylon rope Sufficient ground water sample was collected from each j well to fill three 40-m1 EPA-approved VOA vials containing 0 5 ml 1 S% hydrochloric acid as a preservative for the samples Care was taken to ensure that visible air bubbles were not present in the