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<br />~~ <br /> <br />May 18, 1990 <br /> <br />Mr. Len Copt <br />Roseville Public Schools <br />1251 West Co~nty Road B-2 <br />Roseville, MN - 55113 <br /> <br />STS Project 94941-YF <br /> <br />Re:_ Petroleum Tank Release Exploration at Lexington School, 1130 West County <br />Road B, Roseville, Minnesota - (LEAK NO. 00001962) <br /> <br />Dear Mr. Copt: <br /> <br />STS Consultants. Ltd. has completed the Petroleum Tank Release Exploration at Lexington <br />School, 1130 West County Road B, Roseville, Minnesota. The scope of services provided by <br />STS are outined in Proposal P-2905 dated March 30, 1990 and subsequently modified at your <br />verbal request of April 5, 1990. The revised scope of work was outlined in the STS letter <br />dated April 11, 1990. The work was petformed pursuant to your issuance of Purchase Order <br />No. 73749. <br /> <br />The scope of work was designed based upon the recommendations by Mr. Chris Zadak of the <br />Minnesota Pollution Control Agency (MPCA). The following information outlines the pro- <br />cedures employed and the results obtained from the site exploration at Lexington School. <br />Conclusions and recommendations are also included, based upon the data obtained. <br /> <br />Introduction <br /> <br />A 250 gallon underground fuel oil storage tank was removed from service at Lexington School <br />on November 5, 1989 (STS Project #94933-XF). An environmental geologist from STS Con- <br />sultants was present to observe the tank removal. During the tank removal, approximately 1 <br />to 2 gallons of product was estimated by the contractor to have leaked from the tank. <br />After the removal, several 1 to 2 inch diameter corrosion holes were observed in the tank. <br /> <br />Soils impacted by the product which leaked during the removal process was removed with a <br />shovel by the contractor. It was estimated approximately 1 cubic yard was removed and <br />transported to a stockpile at Roseville High School. Chemical samples obtained from the <br />base of the excavation and the soil stockpile had total petroleum hydrocarbons (TPH) as <br />fuel oil detected at levels of 4800 parts per miJlion (ppm) and 7600 ppm. respectively. No <br />values above detection limits for benzene, ethylbenzene. toluene and xylene (BETX) were <br />identified in either soil sample. <br /> <br />ITI Conaulblnta Ltd. <br />Consulting Engineers <br /> <br />3650 Annapolis Lane <br />Minneapolis, Minnesota 55447 <br />612.559.1900/Fax 612.559.4507 <br />