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� A site�valkover may provide clues as to the presence of an abandoned UST. Heating oil tanks , usually exhibit spiIlage during filling, especially if the tank is old and has been filled repeatedly over a number of years. Staining of the soil with or tivithout the characteristic odor of fuel oil may be an indicator of the presence of an abandoned fuel oil tank. If the soil appears to be undisturbed, check for the presence of a fill pipe or a fill pipe that may have been cut off below ground level and covered over. Fuel oil tanks are generally buried near the foundation of the building. Check the basement of the structure for the placement of the furnace and any piping to an outside wall that may remain. If� the piping has been removed, look for a hole or patched hole in the wall in the general vicinity of the furnace or the area where the furnace once resided. The fuel oil tank, if present, should be on the other side of the wall, near the foundation. Fuel oil tanl�s of greater than 1,100 gallons capacity should be registered by the tank owner with the I1�IPCA. Contact the Tan�:s and Emergency Response Section at (612) 297-8679 to see if there is any information that indicates the presence or former presence of a tank at this site. USTs are generally buried 36"-42" belotiv ground. Nletal detection der•ices such as those used by NSP to locate metal gas lines and electrical titi•ires may be capable of detectina the presence of an UST if it isn't buried too deep. Soil borings in an area of the site suspected to contain an UST can be conducted, but this can be a costly option. If the soil is sandy or othen3�ise relatively porous, a metal rod may be driven into the ground to a depth of 48" or so in areas suspected to contain a buried UST. Escavation may also be an option, however, this is labor intensive, may be costly and will be disruptive of the integrity of the site. ;..: :::.:.:.::.::.:.:;.:;:.::.;::::::..:: :.;.;: ;:.;;: . :::.:.:,:;..:::;:;:.;:.;:.:::::..;:.;: .., :::::>:�>.<::..:.;:<;:::::::;:;:::::�:::<:::<::;<:.. .. � ':..'��Ll"�S'> ' The presence of unsealed �vells is a concem in many older buildings. Any unsealed or improperly sealed tivells need to be identified and a licensed w•ell contractor needs to be contacted to properly seal the well(s). The following information includes some clues on how you miaht locate an unsealed tivell and jvho to contact to learn more about them. Locatina unsealed w�ells is a combination of research and educated guesses. There are three areas `ti�here records of old tivells may be located: ♦ 1linnesota Geological Survey (612) 627-=�78-�,titi•ater�ti•ell records by section, township and range, and sometimes by address, ♦ I�Sinnesota Department of Health S�'ell l�Ianagement Unit (612) 21�-0811, Pre-1990 the tir•ells are classified b}' }'ear and the contractor that drilled the �r•ell, � �