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r <br /> r <br /> x <br /> z <br /> QUARTERLY REPORT -- August 1997 <br /> NOMELLINI CONSTRUCTION COMPANY <br /> 1045 West Chdrter Way <br /> Stockton, California ` <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Mr Dante John Nomellini of Nomellini Construction Company, <br /> Advanced GeoEnvironmental, Inc (AGE) has performed quarterly ground water monitoring <br />'4 activities at 1045 West Charter Way, Stockton, California (the site) <br /> This report details the monitoring and sampling procedures performed on 12 August 1997 and <br /> presents the results of the laboratory analysis The objective of the environmental activity was to <br /> monitor ground water conditions and concentrations of petroleum hydrocarbons in ground water at <br /> the site A description of previous investigations at the site was included iii the Quartet ly Report- <br /> November 1996, dated 17 January 1996, prepared by AGE The location of the site and the <br /> immediately surrounding area are illustrated on Figure 1 - Location Map Site structures and <br />' monitoring well locations on the site are shown on Figure 2 - Site Plan <br /> The monitoring 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 /> 20 PROCEDURES <br /> l <br /> 2 1 MONITORING WELLTURGE PROCEDURES <br /> On 12 August 1997,the depth to ground water in each monitoring well was measured to the nearest <br /> 0 01 foot utilizing a Solinst water level meter The relative ground water elevations were calculated <br /> by subtracting the depth to ground water from the relative casing elevations surveyed from a <br /> temporary benchmark (Table 1 - Relative Ground Water Elevations) Relative ground water <br /> elevations were plotted and contoured on a scaled site map (Figure 3 - Relative Ground Water <br /> Elevation Map) <br /> I, After water levels were measured, approximately 10 to 15 gallons (a minimum of three well <br /> volumes) 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 monitor stabilization of these physical characteristics <br /> Stabilization data and field logs are in Appendix A Purged water wa`s stored in 55-gallon drums on- <br /> site in an area lacking general public access <br /> Advanced GeoEnwonmental,Inc <br /> r <br />