Laserfiche WebLink
i <br /> 1 <br /> Quarterly Report - September 1998 <br /> TOP FILLING STATION <br /> 101 South Wilson Way <br /> Stockton, California <br /> 1..0. INTRODUCTION <br />' At the request of Mr Ed Endich, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> Quarterly Report for I01 South Wilson Way, Stockton, California The site setting is illustrated on <br />' Figure 1 Site structures and monitoring well locations are depicted on Figure 2 <br />' The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water and to characterize ground water flow direction and gradient on the site This report is <br /> prepared in accordance with guidelines established by the San Joaquin County Public Health <br />' Services - Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water <br /> Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites A <br /> summary of previous investigations at the site was included in the Quarterly Report- October 1996, <br /> Idated 22 November 1996, prepared by AGE <br /> 2.0 QUARTERLY MONITORING AND SAMPLING PROCEDURES <br /> On 09 September 1998, ground water monitoring and sampling was performed at wells MW-1 <br /> through MW-5, VW-I C, VW-2A and VW-3A <br />' 2 1 MONITORING WELL PURGE PROCEDURES <br />' Depths to ground water were measured from the top of each well casing at the site to the nearest 0 01 <br /> foot utilizing a Solinst water level meter Ground water elevations in each well at the site were <br /> calculated by subtracting the measured depth to ground water from surveyed casing elevations <br /> (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured, approximately 10 to 20 gallons of ground water (a minimum of <br /> I three well volumes per well)were removed from wells MW-1 through MW-5, VW-I A, VW-2C and <br /> VW-3C utilizing a two-stage submersible pump,the first two gallons were removed utilizing a teflon <br /> bailer and new rope Temperature, pH and conductivity were measured for stabilization at regular <br /> purge volume intervals from each well using an ICM Model 52200 water analyzer Field data and <br /> logs are included with Appendix A Purged ground water was containerized in 55-gallon drums and <br /> was stored on-site in an area lacking general public access <br /> Advanced GeoEnvironmental,Inc <br />