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, v r { _ Quarterly Report - June 1999 NOMELLINI CONSTRUCTION CO. 1045 West,Charfer Way N- i Stockton, California _ I 1.0. INTRODUCTION r f F Advanced GeoEnvironmental,Inc (AGE)has prepared tlus Quarterly,Report for 1045 West Charter, Way, Stockton, California The site setting is Illustrated on Figure 1 Site structures and monitoring - ' well locations are depicted on Figure 2 F' n 1 The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground ' water and to characterize 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 - Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water k ' _ ' r 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 - February ' 1996, dated 17 May 1996, prepared by AGE y , T A V 2.0. PROCEDURES Ori 28 dune 1999, ground water monitoring and sampling was performed on wells MW-1,=MW-2, MW-3, MW-4, MW-7, VW-3, VW-4, VW-6 and VW-8 Ground water monitoring procedures for , the site were outlined in Interim Work Plan, dated 10 July 1995 r E Y 2 1 MONITORING WELL PURGE PROCEDURES v i Depths to groundwater were measured from the top of each well`casing at the site`to the nearest 0 01 , foot utilizing a Solinst water level meter Ground water elevations,in each well.at the site were ' calculated by subtracting the measured depth-to ground water from surveyed 'casing' elevations' - Y (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) After water levels were measured, approximately 20 gallons of ground water (a minimum of three well volumes per well) were removed from wells MW-1, MW-2, MW23, MW-4 and MW-7 utilizing y a submersible two-stage'submersible pump, ground water pumping was'initiated at the top of the- F ' water column and,the pump was slowly loweredlto total'depth to purge ground water within the entire well casing Approximately 3 gallons of ground water were removed from wells VW-3, VW- - a 4, VW-6 and VW-8 before being pumped "dry" Temperature,pH and conductivity were measured ' ' for stabilization at`regular purge volume intervals from each well using an ICM Model 52200 water ., u analyzer Field data and logs are included with Appendix A'Purged ground water was containerized in 55-gallon drums and was stored on-site in an area lacking general public access { Advanced GeoEnr ironmental,Inc ! r j L `