ARCHIVED REPORTS_XR0008908 - Laserfiche WebLink

Home Browse Search

' Quarterly Report - November 1998 & February 1999 FORMER CHASE CHEVROLET (VAN BUREN) FACILITY ' 424 North Van Buren Street, Stockton, California ' 1.0. INTRODUCTION At the request of Mr Jeffery Setness of Jeff B Setness Professional Law Corp , Advanced tGeoEnvironmental, Inc (AGE) has prepared this Quarterly Report summarizing field activities performed during the fourth quarter of 1998 and the first quarter of 1999 at 424 North Van Buren ' Street, Stockton, California (Figure 1 - Location Map) The scope of work Included monitoring ground water, collecting ground water samples, obtaining laboratory analyses of the samples and preparation of this report Structures and monitoring well locations on the site and adjacent area are ' Illustrated in Figure 2 - Viciniry Map Field activities were performed in accordance with guidelines established by the Regional Water ' Quality Control Board - Central Valley Region (RWQCB-CVR) and by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) for the investigation of underground storage tank(UST) sites Background information was summarized in the Corrective ' Action Plan - December 1996 prepared by AGE '• 2.4. PROCEDURES ' 21 MONITORING WELL PURGE PROCEDURES On 03 November 1998 and 02 February 1999, a Solinst water level meter was used to measure the ' depth to ground water in nine monitoring wells at the site and fifteen monitoring wells at the Madison site relative to the tops of the well casings An Ullage interface probe was used to check for the presence of free product in MW-3 and MW-9 The ground water elevations and hydraulic ' gradient were determined from these data(Table 1) On 04 November 1998 and from 03 to 04 February 1999, each monitoring well at the site was ' purged using a two-stage submersible purge pump The pump was decontaminated prior to purging each well using an Alconox solution and clean tap water Temperature, pH and conductivity of ' purged water were measured at regular intervals during purging using an ICM model 52200 water analyzer or a Hydac water analyzer Stabilization data was not collected from MW-14, MW-15 and MW-17 during the February 1999 monitoring event due to equipment malfunctions Approximately ten to fifteen gallons of water (approximately three well volumes) were removed from each well except MW-9, from which fifty and sixty gallons of water were purged Al l purged water was stored in 55-gallon DOT-approved drums on-site Field data and field logs are included in Appendix A Advanced GeoEnvironmental.Inc