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<br />The MPCA was also contacted about past spills and leaks in or near the <br />neighborhood. They were aware of a pipeline release site located at 1700 <br />and 1708 Oakcrest Avenue for which information was reviewed and <br />received. Leaks (primarily Williams Pipe Line) had previously been <br />discovered and repaired from the 1960's through the mid 1990's. In 1993 <br />Amoco Oil reported hydrocarbon odors at the same location during coating <br />repair work on their parallel pipeline. Williams Pipe Line Co. did not find <br />any leak then conducted a standard investigation to define the extent of the <br />affected soil and groundwater and to evaluate the risk. They constructed <br />and operated an extraction system for more than 1 year until all <br />hydrocarbon vapor concentrations were reduced to levels approved by the <br />MPCA. The remaining low levels will continue to decrease over time by <br />natural attenuation with biological degradation. The maximum <br />contamination area was about the size of two residential lots, was not <br />present at depths greater than 20 feet below grade and due to the dense <br />clay more than 30 feet of uncontaminated soil was present between any <br />groundwater aquifer. <br /> <br />Adjacent to the neighborhood at 2621 North Fairview Avenue (west side of <br />Fairview) is the Ideal Security brass cleaning contaminated site that has <br />recently been cleaned up by Industrial Equities (John Allen, developer) and <br />is now being redeveloped. The prior metal cleaning business caused <br />building (asbestos) and soil and perched ground water contamination <br />(cleaning solvents trichloroethylene, xyl3ne, and related degradation <br />products) which did not extend beyond the property. Investigation <br />determined the contamination was limited to the top few feet of soil and did <br />not contaminate the groundwater beyond the site. The groundwater was <br />pumped from this perched water table and treated to meet state discharge <br />permit conditions. The contamination soil sediments were excavated, <br />pulverized, and mixed with sand to enhance permeability for soil vapor <br />extraction. This clean-up project has now been completed and approved by <br />the MPCA. The new development under construction is 42,000 s.f. of office <br />showroom space. The site has its own storm ponding area. <br /> <br />M:\JAMESADD\T ASK-RE2.DOC <br /> <br />12 <br />