ARCHIVED REPORTS_XR0008905 - Laserfiche WebLink

Home Browse Search

I Quarterly Report - August 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 GeoEnvironmental, Inc (AGE) has prepared this quarterly report summarizing field activities performed during the third quarter of 1999 at 424 North Van Buren Street, Stockton, California ' (Figure 1 - Location Map) The scope of work included installation of a soil vapor extraction unit and an in-situ air sparging unit, installation of piping, quarterly ground water monitoring, 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 - Vicinity Map and Figure 3 - Remediation System Background information was summarized in Corrective Action Plan - ' December 1996 and in Quarterly Report- May 1999, both prepared by AGE ' 2.0. PROCEDURES 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 Field procedures for the installation of the remediation system ' and performance of ground water monitoring and sampling are described below I21 MONITORING WELL PURGE PROCEDURES I On 10 August 1999, a Solinst water level meter was used to measure the depth to ground water in nine monitoring wells and five vapor extraction 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 I for the presence of free product in MW-3 and VW 1 through V W5 The ground water elevations and hydraulic gradient were determined from these data (Table 1) The well box cover and locking cap were missing from MW-14 upon arrival at the site and were replaced at this time After measurement of depths to water, 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 the purged water were measured at regular intervals during purging using an ICM model 52200 water analyzer Dissolved Ioxygen was measured in the final purge water using a YSI model 55 dissolved oxygen meter . Approximately ten to fifteen gallons of water were removed from each well except MW-9, from which sixty gallons of water were purged (approximately three well volumes) All purged water was stored in 55-gallon DOT-approved drums on-site Field data and field logs are in Appendix A Adianeed GeoEnllronmental,Inc