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14 December 2000 <br /> AGE-NC Project No 99-0559 <br />' Page 10 of i I <br />' Analytical results of water samples are summarized in Table 4 The laboratory reports (MAI <br /> Laboratory I D Nos 30201, 30202, 30203, 31858, 46815 and 46816), quality assurance and quality <br /> control (QA/QC) reports and chain-of-custody forms are included in Appendix D <br /> 46 FREE PRODUCT REMOVAL <br />' Between February and March 2000, free product thickness measurements and free-product removal <br /> were performed in well MW-2 Free product thickness was measured with a disposable bailer and <br />' free-product was manually removed with a hand bailer Approximately three feet of product was <br /> initially measured in February 2000 After bailing,the water and the free product were stored on-site <br /> in 55-gallon DOT H-17 storage drums The current free product thickness vanes from approximately <br /> one-tenth of an inch to six-inches Field data and logs are included with Appendix B A manifest for <br /> the waste disposal is included in Appendix E <br /> 5.0 SUMMARY AND CONCLUSIONS <br />' • Based on data collected during the preliminary site assessment AGE concludes <br /> • The most intense hydrocarbon-impacted and MTBE-impacted soil is in the area of borings <br /> B2, MW-2, and MW-3 at depths as great as 65 feet A significant mass of hydrocarbons is <br /> present in the vicinity of well MW-2 from 15 feet to 65 feet bsg and to a lesser degree south <br /> of the former USTs in the area of well MW-3 from 45 feet bsg to 65 feet bsg <br /> • The highest concentrations of dissolved TPH-g and MTBE are in the vicinity of the former <br />' active USTs as shown by laboratory analysis of the grab ground water samples collected <br /> from well MW-2 <br /> • TPH-g and MTBE impacted ground water at the site The limits of impacted ground water <br /> Iis not defined <br /> • Approximately six inches of free-product has been regularly observed in well MW-2 <br /> 6.0. RECOMMENDATIONS <br /> Additional subsurface assessment directly north, west and east of the UST area to determine the <br /> lateral extent of petroleum hydrocarbon-impacted and MTBE-impacted soil is necessary The vertical <br /> extent of impacted soil and ground water should be assessed <br /> Based upon data collected during quarterly sampling. AGE recommends quarterly monitoring of the <br /> ground water monitoring wells Ground water wells also need to be installed west of well MW-4. <br /> i <br />