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July 16, 1990 <br />Minnesota Pollution Control Agency�r,» <br />520 Lafayette Road, Saint Paul, Minnesota 55155 <br />Telephone (612) 296 -6300 <br />Mr. Dennis Lorenz <br />Sinclair Oil Corporation <br />3401 Fairbanks Avenue <br />F.O. Box 6247 <br />Kansas City, Kansas 66106 <br />Dear Mr. Lorenz: <br />RE: Petroleum Storage Tank Release Investigation and Corrective Action <br />Site: Sinclair, 228 Little Canada Road, Little Canada, Minnesota <br />Site ID #: LEAK00000633 <br />The Minnesota Pollution Control Agency (MPCA) staff has reviewed the "Subsurface <br />Environmental Investigation" submitted by Braun Environmental Laboratories <br />(Braun), dated April 19, 1990. Based upon the submitted information in both the <br />April 19,1990, and August 15, 1988 reports, the following addresses MPCA <br />concerns and recommendations: <br />Background: <br />In July 1988, three gasoline underground storage tanks (USTs) were excavated and <br />removed. During excavation, petroleum odors were noted. According to Braun's <br />August 15, 1988 report, no soil sampling was performed during the USTs' removal. <br />However, three soil borings were subsequently conducted and sampled through and <br />adjacent to the former USTs' basin. <br />Analytical results from the boring conducted adjacent to the northern side of <br />the USTs basin indicated high levels of benzene, ethylbenzene, toluene, xylenes <br />and total hydrocarbons (THC) as gasoline. <br />In March 1990, four additional soil borings were conducted and sampled. <br />Analytical results indicated 1.7 parts per million (ppm) xylenes and 12 ppm THC <br />at twenty feet below the surface in a soil boring conducted approximately thirty <br />t feet northwest from the northern boundary of the former USTs' basin. <br />Field observations contained in Braun's April 19, 1990 report indicated that <br />petroleum odors were noted in three of the four soil borings conducted in March <br />1990. Jar headspace analyses performed then indicated readings ranging from <br />background to 350 ppm. <br />It is Braun's recommendation that no additional clean up is needed at this site <br />"7* based upon the site's geology, no petroleum contamination is apparent at the <br />ground water level as indicated by soil borings, and the site is covered by an <br />asphalt parking lot. <br />Regional Offices: Duluth • Brainerd • Detroit Lakes • Marshall • Rochester <br />Equal Opportunity Employer <br />Printed on Recycled Paper <br />Page 47 <br />