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in <br /> The MPCA was also contacted about past spills and leaks■ I ocated at 1700 <br /> neighborhood, They vmre aware of a pipeline release Wto I <br /> and 1708 Oakcrest Avenue for whichinformadon was reviewed and <br /> ,oly Williams Plpe Line) had previously been <br /> received, Leaks (p "ma <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 pipel"ne, ■ <br /> any leak then conducted a standard 'investigation to define the extent of the <br /> aftcted soll and groundwater and to evaluate the nosk. They constructed <br /> and operated an extraction system 1br more than 1 year until all <br /> hydrocarbon vapor concentrations were reduced to levels approved by the <br /> MPCA, The remaining low levels W1111 <br /> residential natural attenuation Wifth biological degradation. The maximum <br /> contamination area was about the s1ze of two <br /> present at depths greater than 20 feet below grade and due to the dense <br /> clay more than 30 feet of uncontaminated ■ <br /> groundwater aquifer. <br /> Adjacent to the neighborhood at 2621 North . ■ <br /> ■ <br /> site that has <br /> Fa'Irview) 'is the Ideal Security brass cleaning contaminated I <br /> recently been cleaned up by Industrial Equities (John Alleng developer) and <br /> Is now being redeveloped, The prior metal cleaning business caused <br /> building (asbestos) and ■ <br /> soil and perched ground water contamination <br /> investigation(cleaning solvents trichloroethylene, xylene, and related degradation <br /> products)which did not extend beyond the propertym <br /> it and did <br /> determined the contamination was limmIted to the top few f66t Of so' <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 /> contamination permit conditions. The <br /> pulven-zed., 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 3-1 of OW'cG <br /> showroom space. The site has Its own storm ponding area, <br /> ■ <br /> 12 <br />