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Underground Tank Removal <br />E -Z Serve Station <br />239 S. Stockton Ave., Ripon <br />Introduction <br />The purpose of this project was to remove three underground storage <br />tanks (USTs). The USTs had capacities of 8,000, 8,000 and 6,000 gallons, and had <br />all been used for storage of gasoline. Site investigation and sampling was <br />completed by Dave Charter of AAT Environmental, under the observation of <br />Michael Kith of the San Joaquin County Department of Health. <br />Field Observations <br />All three gasoline tanks were uncovered with an excavator and the fill, <br />Product, and vent lines removed from the tanks. The USTs were then "triple <br />rinsed" using a high pressure washer, and the rinsate was removed from the <br />USTs with a vacuum truck. The rinsate was manifested as non-RCRA hazardous <br />liquid waste, and transported to Gibson Environmental, in Bakersfield, a <br />California licensed facility. Dry ice were then added to the tanks at the rate of <br />15 pounds per thousand gallons, to purge all oxygen from the USTs for removal <br />and transport. The tanks were then removed from the ground with the <br />excavator, and required soil samples collected. <br />All three USTs were in fair to good condition, with no significant pilling <br />or holes observed. They were all constructed of single wall, unprotected steel <br />and had been backfilled with native sandy soil. Some soil above and around the <br />tanks was discolored and exhibited a petroleum odor. <br />Page 1 <br />