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Closure Summary Addendum <br /> ' W.T. Jordan Property <br /> 298 West Grant Line Road <br /> Tracy, California <br /> I1.0. INTRODUCTION AND SCOPE OF WORK <br /> At the request of Mr William Jordan,Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> Closure Summary Addendum for 298 West Grant Line Road, Tracy, California (the site) Figure 1 <br /> depicts the site and its surrounding vicinity Figure 2 depicts significant structures and monitoring <br /> well locations on the site <br /> ' Filed activities included ground water monitoring and analysis of ground water samples <br /> Additionally, a discussion of the removal from soil at the north end of the site is included Site <br /> history and findings from previous investigations and previous monitoring events at the site were <br /> summarized in the Closure Summary Report dated 02 June 1997 prepared by AGE This addendum <br /> was prepared to provide additional information requested by the PHS-EHD by letter dated 16 <br /> February 1999 <br /> t2.0. PROCEDURES <br /> • Monitoring and sampling procedures were performed in accordance with guidelines for the <br /> subsurface investigation of underground storage tank (UST) sites established by the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) and the San Joaquin County Public Health <br /> Services - Environmental Health Division (PHS-EHD) <br /> j21 MONITORING WELL PURGE PROCEDURES <br /> On 23 July 1999, the water level in each monitoring well was measured relative to the tops of the <br /> ' existing well casings (MW-1 through MW-3 and MW-6) using a Solinst water level meter The <br /> depths to ground water and relative ground water elevations are tabulated in Table 1 <br /> ' After recording water level measurements, four monitoring wells MW-1 through MW-3 and MW-6 <br /> were purged of standing water using a two-stage submersible pump A minimum of three well- <br /> volumes of water were removed from each purged well, nine gallons of water were removed from <br /> wells MW-I through MW-3 and four gallons of water were removed from well MW-6 An ICM <br /> Model 52200 water analyzer was utilized to monitor temperature, pH and conductivity of purged <br /> ' water at regular purge volumes Stabilization data and field logs are included in Appendix A Purged <br /> ground water was containerized in 55-gallon DOT-approved drums and stored on-site <br /> I � <br />