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SECOND QUARTER 2003 <br /> GROUNDWATER MONITORING REPORT <br /> AND ADDITIONAL ASSESSMENT REPORT <br /> JAMAR OIL DISTRIBUTION <br /> .TUNE 2003 <br /> Groundwater analytical data are summarized in Table 2 and shown on Figure 5. Copies of the <br /> laboratory reports with COC documentation are included in Appendix G. <br /> Discussion <br /> This was the first time samples from monitoring wells MW-6A, MW-6B, MW-7A, and MW-7B <br /> were analyzed. In both sets of cluster wells, the deeper well(B) showed higher conc`erations than <br /> the shallower well (A). This is the opposite from the results found with the geoprobe samples in <br /> January 2003. Extraction well EW-1 showed the highest results of any of the wells,the results <br /> were slightly higher than those during the APT sampling. EW-1 and MW-1 appear to represent the <br /> heart of the impacted groundwater plume. The other onsite wells showed similar results to those <br /> found the last two quarters, which are less than historical levels. The level of hydrocarbon <br /> constituents in the new offshe wells are relatively low except for MW-6B, which reported 2,400 <br /> ug/l MTBE. <br /> The sensitive receptor survey identified fifteen water supply wells within 2000 feet of the site with <br /> one unconfirmed location downgradient of the subject site. <br /> The APT results indicate a relatively good radius of influence for EW-1, with an optimal pumping i <br /> rate of 2.5-3 gpm. <br /> Recommendations <br /> GUR makes the following recommendations: <br /> • Install and operate an interum pump and treat system to extract and treat impacted <br /> groundwaterqkkm extraction well EW-1. Due to the favorable APT results and the <br /> relatively flat groundwater gradient at the site, an interim treatment system could <br /> reduce petroleum hydrocarbon and MTBE concentrations enough to substantially <br /> reduce plume migration. <br /> i <br /> • s at the site to document any plume migration. <br /> Continue quarterly monitoring of all well <br /> i <br /> • Discontinue analysis of EDB, which has never been detected at the site. <br /> • Application of the site to the UST Cleanup Fund Expedited Reimbursement program <br /> due to the number of water wells located within 2000 feet of the subject site. <br /> 12 <br />