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4:9;S1 <br /> Minnesota Pollution Control Agency r\--> <br /> 520 Lafayette Road, Saint Paul, Minnesota 55155 P ' <br /> • 14:501 Telephone (612) 296-6300 ..;..,::�T��9 <br /> October 2, 1989 <br /> Mr. Ambross DeGross <br /> Long Lake 66 <br /> 2525 Highway 10 <br /> Mounds View, Minnesota 55432 <br /> Dear Mr. DeGross: <br /> Re: Petroleum Storage Tank Release Investigation and Corrective Action <br /> Site: Long Lake 66, 2525 Highway 10, Moundsview, Minnesota <br /> Site ID#: LEAK00000583 <br /> The Minnesota Pollution Control Agency (MPCA) staff has reviewed the Proposed <br /> Corrective Action Design (CAD) dated June 16, 1989, prepared by Dahl & <br /> Associates (Dahl) outlining a plan of response to the petroleum tank release at <br /> the above referenced site. This letter will outline tie MPCA's comments and <br /> recommendations. <br /> • BACKGROUND: <br /> The Long Lake "66" site is currently operated as a gasoline service station. <br /> These are two tank basins located at the site. One contains three 6,000 <br /> gallon underground storage tanks and the other contains one 1,000 gallon <br /> waste oil storage tank. There has been no evidence of a release from these <br /> tank basins. The station inventory records indicate that a 3,000 gallon <br /> premium gasoline release from a product dispensing line occurred during the <br /> first week of operation in July of 1963. <br /> In the summer of 1988, Dahl & Associates conducted sail borings and installed <br /> monitoring wells as part of an investigation to determine the extent atiu <br /> magnitude of contamination. e • •• • • — -' contaminated <br /> contamination that is centered near the dispense: i�=�••�� :. <br /> soils cover an area of approximately 8,000 square feet. These soils <br /> represent a potential continuing source of ground water contamination. Three <br /> ground water monitoring wells were installed at the site. Free product <br /> measurements ranged between 0.10 feet and 1.73 feet in Monitoring Well 1 <br /> k;i -1) located near the dispensing islands MW-2 and MW-3 both have shown <br /> dissolved petroleum hydrocarbon contamination. <br /> Dahl has proposed a three point remedial action plan for the site. Dahl's <br /> ----nosal includes 1) a soil venting system to be installed to facilitate <br /> removal of hydrocarbon vapors from the soil which i,4Lludes a pilot study 2) <br /> a free product recovery system with ground water gradient control, water <br /> treatment and disposal for free product removal; and 3) a dissolved petroleum <br /> • hydrocarbon removal system with ground water gradient control, water <br /> treatment and disposal for contaminated ground water. <br /> Regional Offices: Duluth • Brainerd• Detroit Lakes • Marshall • Rochester <br /> Equal Opportunity Employer Printed on Recycled Paper <br />