By Kristen Espeland
http://stream.publicbroadcasting.net/production/mp3/wkms/local-wkms-852502.mp3
Louisville, KY – Some pollution you can smell or see, the fumes form a diesel powered truck, a slick of oil on the Ohio River. Some sources are less noticable, but just as insidious. As Kentucky Public Radio's Kristen Espeland reports underground petroleum storage tanks are getting renewed attention with an influx of federal stimulus dollars.