Laserfiche WebLink
i <br /> Quarterly Report - April 1998 <br /> LARRY'S AUTO REPAIR <br /> 308 North Grant Street, Stockton, California <br /> II.O. INTRODUCTION AND SCOPE OF WORK <br /> In accordance with a request from Mr Charles Skobrak,Advanced GeoEnviionmental, Inc (AGE) <br /> has prepared this report summarizing ground water monitoring activities performed at 308 North <br /> Grant Street, Stockton, California Quarterly ground water monitoring was conducted on 24 April <br />' 1998 The location of the site is illustrated in Figure 1 -Location Map Structures and well locations <br /> are illustrated on Figure 2 - Site Plan Background information was summarized in the Quarterly <br /> Report -August 1997 prepared by AGE <br /> Field work was performed in accordance with San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and Regional Water Quality Control Board-- Central <br /> Valley Region (RWQCB-CVR) guidelines for the investigation of underground storage tank (UST) <br /> sites <br /> 2.0 PROCEDURES <br /> 21 MONITORING WELL PURGE PROCEDURES <br /> I On 24 April 1998, an Ullage interface probe was used to measure the,depth to ground water and to <br /> check for the presence of free product in five monitoring wells and seven vapor wells at the site <br /> relative to the tops of the well casings The ground water elevations,ground water flow direction and <br /> hydraulic gradient were determined from these data (Table 1) <br /> After measuring ground water depths, monitoring wells MW-1, MW-2, MW-3, MW-4 and MW-7 <br />' y and vapor wells VW-2B, VW-3, VW-4, VW-513 and VW-5C were purged using a Grundfos <br /> submersible purge pump Approximately 4 to 20 gallons of water were removed from each purged <br /> well ,(minimum of three well-volumes for each well) Temperature, pH and conductivity were <br /> measured at regular intervals during purging The measured properties of the purged water and the <br /> field sheets are included in Appendix A The purged water was'stored on-site in 55-gallon DOT <br /> drums pending laboratory analyses <br /> 22 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new disposable bailers Each sample was <br /> transferred into 40-m1 EPA-approved VOA'vials containing 0 5 ml of 18% hydrochloric acid as a <br /> preservative The sample from MW-4 was also transferred into a 1-liter amber bottle without <br /> preservative The samples were labeled,placed in a chilled container and transported under chain-of- <br /> Advanced CeoEnvironmental,Inc <br />