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1 ' <br /> Ground Water Monitoring Report - Third Quarter 2000 <br /> ' PAIGE'S TOWING <br /> 1807 Douglas Road, Stockton, California <br /> lA. INTRODUCTION AND SCOPE OF WORK <br /> ' Advanced GeoEnvironmental, Inc. (AGE)has prepared this quarterly report for 1807 Douglas Road, <br /> Stockton, California. The site setting is illustrated on Figure 1. Site structures and monitoring well <br /> locations are depicted on Figure 2. A summary of previous investigations at the site was included <br /> ' in Preliminary Site Investigation and Evaluation Report, dated 20 February 1996 and prepared by <br /> AGE. Ground water monitoring procedures for the site were outlined in Work Plan Addendum - <br /> ' September 1998, dated 16 September 1998 and in Revision to Work Plan Addendum - September <br /> 1998, dated 16 March 1999 and were approved by the PHS-EHD by letter dated 29 March 1999. <br /> ' 2.0. PROCEDURES <br /> ' The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water and to characterize ground water flow direction and gradient on the site. Field work and report <br /> preparation are in accordance with guidelines established by the San Joaquin County Public Health <br /> lie <br /> Services - Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water <br /> Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites. <br /> 2.1. MONITORING WELL PURGE PROCEDURES <br /> On 25 September 2000, ground water monitoring and sampling was performed on wells MW-1, <br /> MW-2, MW-3, and MW-4. Prior to sampling, the depth to ground water was measured from the top <br /> of each well casing to the nearest 0.01 foot utilizing a Solinst water level meter. Ground water <br /> ' elevations in each well at the site were calculated by subtracting the measured depth to ground water <br /> from surveyed casing elevations (Table 1). <br /> ' After water levels were measured, approximately eight to nine gallons of ground water (a minimum <br /> of three water-casing volumes per well) were removed from each well utilizing a disposable bailer. <br /> Temperature,pH and conductivity were measured for stabilization at regular purge-volume intervals <br /> ' from each well using a Hydac water analyzer. Field data and logs are in Appendix A. Purged ground <br /> water was containerized in 55-gallon drums and was stored on-site in an area lacking general public <br /> ' access. <br /> ' 2.2. GROUND WATER SAMPLING <br /> SWater samples were collected from each purged well using new disposable plastic bailers after the <br /> ground water had recharged a minimum of 80%. Each water sample was transferred into one I-liter <br /> Advanced GeoEnvironmental,Inc. <br /> 1 <br />