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i Quarterly Report - First Quarter 2000 LARRY'S AUTO REPAIR 308 North Grant Street, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK IAt the request of Mr Charles Skobrak,Advanced GeoEnvironmental, Inc (AGE) has prepared this report summarizing ground water monitoring activities performed at 308 North Grant Street, Stockton, California during the first quarter of 2000 Quarterly ground water monitoring was conducted on 16 February 2000 The location of the site is illustrated on Figure 1 Structures and well locations are illustrated on Figure 2 Background information was summarized in Quarterly IReport -August 1997 prepared by AGE 2.0 PROCEDURES I Field work was performed in accordance with San Joaquin County Public Health Services - I Environmental Health Division (PHS-EHD) and Regional Water Quality Control Board - Central Valley Region (RWQCB-CVR) guidelines for the investigation of underground storage tank {UST) sites 2 1 MONITORING WELL PURGE PROCEDURES I On 16 February2000, a Solinst water meter was used to measure the depth to ground water in four P I monitoring wells and five vapor wells at the site relative to the tops of the well casings An Ullage interface probe was also used to check for the presence of free product in wells MW-4, VW-2B, VW-3, VW-4 and VW-5B The ground water elevations, ground water flow direction and hydraulic gradient were determined from these data (Table 1) Monitoring well MW-2 was not assessable due to flooding at the site and therefore was not monitored I After measuring depths to ground water, monitoring wells MW-1, MW-3, MW-4 and MW-7 and I vapor wells VW-2B, VW-3, VW-4, VW-5B and VW-5C were purged using a 2-stage submersible purge pump The purge pump was decontaminated prior to purging each well using an Alconox solution and clean nnse water Approximately 6 to 21 gallons of water (a minimum of 3 well volumes) were remover] from each purged well Water was purged from near the top of the water surface to assure removal of stagnate water trapped within the non-screened section of the drown I wells Temperature, pH and conductivity were measured at regular intervals during purging The measured properties of the purged water and the field sheets are included in Appendix A The purged water was stored on-site in 55-gallon DOT-approved drums pending laboi atory analyses I Advanced GcoEn\Ironmental,Inc