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} QUARTERLY REPORT ` <br /> February 1997 <br /> NOMELLINI CONS TRUCTION_CONWANY <br /> , 1 <br /> 1045 West Charter Way # - <br /> 1 , <br /> , <br />' Stockton, California ; <br /> t i� I w <br /> H 1.0 INTRODUCTION L ' <br /> } r <br /> In accordance with the re4uest of Mr Dante John Nomellim of Nomellini Construction Company, <br /> Advanced GeoEnvironmental, Inc , (AGE), has performed quarterly'ground water monitoring' activities at 1045 West Charter Way, Stockton, California, herein referred to as the site ' <br /> , 1 3 <br /> This report details the monitoring and sampling procedures performed on 26 February 1997 and , <br /> presents the results of the laboratory analysis The objective of the sampling was to monitor <br /> concentrations of dissolved petroleum hydrocarbons in ground water at the site A description of <br /> previous investigations at the site was included in' the Quarterly Repot t -November 1996, dated 17 ' <br />' January 1996;prepared by AGE The location of the site and the immediately surrounding area are , <br /> illustrated on Figure I -Location Map Site structures and monitoring well locations are shown on <br /> Figure 2 - ,Site Plan <br /> . r <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 F <br /> (RWQCB) guidelines for the investigation of underground storage tank (UST) sites <br /> 1 <br /> 2.0. PROCEDURES , <br /> 1I <br /> - <br /> 21 MONITORING WELL PURGE PROCEDURES <br /> On 26 February 1,997, 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 /> by subtracting the depth,to ground water from the,relative casing elevations surveyed from a �Y <br /> temporary benchmark (Table 1 - Relative Ground Water Elevations) Relative ground water' <br />'t r elevations were plotted)and contoured ori a scaled site map"(Figure 3 - Relative Ground Water, ' <br /> ' Elev ' <br /> atron Map) <br /> r 1 <br /> After water levels were measured, six to fourteen gallons (minimum of three well volumes)'of water <br /> were purged from wells MW-l'through MW-9 utilizing a two-stage submersible pump Temperature, - <br /> pH <br /> emperature, - <br /> pH and conductivity,were measured at regular intervals from each well,using an ICM model 52200 <br /> water analyzer,until parameters stabilized Stabilization data and field logs are in Appendix A Purged <br /> water was stored in 55-gallon drums on-site in an area lacking public access <br /> n <br /> 1 , <br /> e I <br /> 1 <br /> 1 1 <br /> 1 <br /> I <br /> 1 , <br /> S <br />