ARCHIVED REPORTS_XR0012257 - Laserfiche WebLink

Home Browse Search

QUARTERLY REPORT March 1997 ITOP FILLING STATION 101 South Wilson Way ' Stockton, California 1.0. INTRODUCTION In accordance with the request of Mr Ed Endich, Advanced GeoEnvironmental, Inc , (AGE) has ' prepared this Quarterly Report for the property at 101 South Wilson Way, Stockton, California The report summarizes field work performed at the site during March 1997 A description of previous investigations at the site was included in Quat terly Report- October 1996, dated 22 November 1996, prepared by AGE The location of the site is illustrated in Figure 1 - Location Map A layout of the property is depicted in Figure 2 - Site Plan ' This report is prepared in accordance with the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and the Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites 2.0 QUARTERLY MONITORING PROCEDURES 2 1 MONITORING WELL PURGE PROCEDURES On 17 March 1997, the depth to ground water in monitoring wells MW-2, MW-3, MW-5 and VW- 1 C were measured from the top of the well casings to the nearest 0 01 foot utilizing a Solinst water level meter Relative ground water elevations were then calculated by subtracting the measured depth to ground water from relative casing elevations (Table 1- Relative Ground Water Elevations) Relative ground water elevations were plotted and contoured on a scaled site map (Figure 3 - IRelative Elevation Ground Water Map) After water levels were measured, approximately 12 to 15 gallons of ground water (minimum of three well volumes) were removed from wells MW-2, MW-3 and MW-5, while approximately 8 gallons of ground water were removed from well VW-1 C utilizing a Grundfos Redi-Flo 11 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 2 2 GROUND WATER SAMPLING The ground water levels in monitoring wells MW-2, MW-3, MW-5 and VW-1 C, were allowed to recover for a minimum of one hour prior to sample collection Ground water samples were collected