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1 Quarterly Report - November 1997 NOMELLINI CONSTRUCTION COMPANY " r 1045 West Charter Wayr w {} ! r r Stockton, California 1.0. _ INTRODUCTION In accordance with a request from Mr Dante John Nomellmi of Nomellini Construction Company, Advanced GeoEnvironmental, Inc (AGE)has prepared this Quarterly Report for 1045 West Charter Way, Stockton, California The location of the site and the immediately surrounding area are illustrated on Figure I Site structures and monitoring well locations are depicted on Figure 2 ; I The objective of the work was to momtot dissolved petroleum hydrocarbon concenaations ir,ground water and to charactenze ground water flow direction and gradient on the site This report is prepared in accordance with guidelines established by the San Joaquin County Public Health Services - Em:ronmertal Health Division(PHS-EHD) and the Central Valley Regional `1.1ater Quality Control Board (CVRWQCB) for' investigation of underground storage tank (UST) sites A summary of previous investigations at the site was included in the Quarterly Report - Febi uary 1996, dated 17 May 1996, prepared by AGE 2.0. PROCEDURES ` 21 MONITORING WELL PURGE PROCEDURES On 25 November 1997, the depth to ground water in each monitoring well was measured to the nearest 0 01 foot utilizing a Solist water,level meter Ground water elevations fiom MW-1 through MW-9 were then calculated by subtracting the measured depth to ground water from the surveyed - casing elevations (Table 1) Ground water elevations with respect to mean sea level were plotted and contoured on a scaled site map (Figure 3) After water levels were measured, `approximately ten to fifteen gallons (minimum of three well ' volumes per well) of water were purged from wells MW-1 through MW-9 utilizing 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 for stabilization of these characteristics _ during purging 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 general public access 5 1 A 22 GROUND WATER SAMPLE COLLECTION , 1 1 The ground water levels in monitoring wells MW-1 through MW-9 were allowed to recover for a minimum of one'hour prior to sample collection ,Ground water samples were collected utilizing disposable polyethylene bailers and new nylon rope. Sufficient ground water sample was collected f i t Advanced CcoEnvironmental,Inc. 5 - h