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, <br /> QUARTERLY REPORT - May 1997 <br /> - NOMELLM CONSTRUCTION COMPANY <br />' 1045 West Charter Way <br /> ` Stockton, California <br /> 10. INTRODUCTION <br /> r - <br /> In accordance with the request of Mr Dante John Nomellini of Nomeflini Construction Company, <br /> Advanced GeoEnvironmental, Inc , (AGE) has performed quarterly ground water monitoring <br /> activities at 1045 West Charter Way, Stockton, California (site) <br /> 1 <br /> This report details the monitonng and sampling procedures performed on 14 May 1997 and presents <br />' the results of the laboratory analysis The objective of the sampling is to monitor concentrations of <br /> petroleum hydrocarbons in groundwater at the site A description of pre',sous investigations at the <br /> site was included in the Quarterly Report - November 1996, dated 17 January 1996, prepared by <br />' AGE The,location of the site and the immediately surrounding area are illustrated on Figuie 1 - <br /> Location ap Site structures and monitoring well locations are shown on Figui e 2 - Site Plan <br />' The monitonng and sampling was performed in accordance with San Joaquin County Public Health <br /> Services - Environmental Health Division (PHS-EHD) and Regional Water Quality Control Board <br /> (RWQCB) guidelines for the investigation of underground storage tank (UST) sites <br /> I2.0. PROCEDURES <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br /> IOn 14 May 1997, the depth to ground water in each monitoring well was measured to the nearest <br /> 0 01 foot utilizing a Solist water level meter The relative ground water elevations were calculated <br /> I by subtracting the depth to ground water from the relative casing elevations surveyed from a <br /> temporary benchmark (Table I - Relative Giound Water Elevations) Relative ground water <br /> ` elevations were plotted and contoured on a scaled site map (Figure 3 - Relative Gi ound Water <br /> IEleI ation Map) r I <br /> After water levels were measured, approximately twelve to fifteen gallons (minimum of three well <br /> Ivolumes) of water were purged from wells MW-1 through MW-9 utilizing a two-stage submersible <br /> pump Temperature, pH and-conductivity were measured at regular intervals from each well using <br /> an ICM model 52200 water analyzer to,inonitor, stabilization, of these physical characteristics <br /> Stabilization data and field logs are in Appendix A Purged water was,stored,in 55-gallon drums on- <br /> site in an area Jacking access from the general public - <br />