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i ' Y Quarterly Report - Second Quarter 2001 I LARRY'S AUTO 308 North Grant Street, Stockton, California I1.0 INTRODUCTION I In accordance with the request of Mr Charles Skobrak,Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for the property located at 308 North Grant Street, Stockton, California The scope of work included quarterly ground water monitoring and preparation of this ' report The location of the site and the immediately surrounding area are Illustrated on Figure 1, structures and monitoring well locations on the site are illustrated on Figure 2 Background information is summarized in Quarterly Report -August 1997,prepared by AGE I 2.0. PROCEDURES ' Field work was performed in accordance with guidelines established by the California Regional Water Quality Control Board-Central Valley Region for Investigation of underground storage tank ' (UST) sites Ground water monitoring procedures were performed as outlined in the RESNA- prepared Assessment of Soil and Groundwater Contamination, dated 17 September 1993 and approved by the PHS-EHD by letter dated 28 September 1993 ' 21 MONITORING WELL PURGE PROCEDURES On 08 Tune 2001, a Solmst water level meter was used to measure the depth to ground-water in fire ' ground water monitoring wells and five vapor extraction wells relative to the'tops of the well casings The ground water elevations and gradient were determined from this data (Table 1) ' After recording water level measurements, two-stage submersible pumps were used to purge the wells of standing water,the purge pumps were decontaminated prior to purging each well using an Alconox solution and clean rinse water Between 20 and 22 gallons of water were removed from ' monitoring wells MW-1 through MW-4,and between 12 and 15 gallons of water were removed from monitoring well MW-7 and vapor extraction wells VW-2C, VW-3, VW-4 and VW-5C, approximately 6 gallon§of water were removed from vapor extraction well VW-513 Ground water ' temperature,pH and conductivity were measured at regular intervals during the purge process using a Hydac and an ICM water analyzer Purged water was stored on site in labeled, 55-gallon DOT- approved drums The field data sheets are included in Appendix A I ' 2 2 COLLECTION AND LABORATORY ANALYSIS OF GROUND WATER SAMPLES . Water samples were collected from each purged well'using new disposable plastic bailers Each Iwater sample was transferred into laboratory-supplied 40-m1 VOA vials containing 0 5 ml 18% Advanced GeoEnvirownental,Inc