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i0 , WWI 40- <br /> STORAGE TANK EXCAVATION , <br /> on February 4, 1986, the three 8,000 gallon fuel storage <br /> tanks and 500 gallon waste oil tank were excavated and removed <br /> from the site by American Environmental Management Corporation, <br /> Rancho Cordova, California. During the excavation for the tanks, <br /> ' soil removed from around the tanks was continuously monitored with <br /> j the HNU photoionizer. In those areas where contamination was <br /> encountered, soil samples were obtained by means of a backhoe. <br /> The samples were placed in brass tubes, sealed and stored on <br /> " ice. The sample collection locations are illustrated in Figure <br /> 2. <br /> Sample S-1 was collected just below the product lines, <br /> between .the two northern tanks, approximately 3 feet below the <br /> surface. A strong petroleum odor was noted in this location. A <br /> i second sample, S-2, was collected from the eastern end of the <br /> ✓' excavation near the southern most tank, appresxinately IO feet <br /> below the .surface, where some contamination was evident. The <br /> remaining three samples, 5-3, S-4 and SM5, were collected <br /> j below eaeh. of the fuel storage tanks. A slight petroleum odor <br /> was noted in the samples from beneath the two outer tanks. The <br /> soil in a small area beneath the centr%il tank, however, appeared <br /> to be .saturated with product. This contamination appeared to be <br /> localized below the fill neck of thetank indicating that it <br /> was most likely the result of overflow during filling of the <br /> .. . <br /> tank. _, The storage tank a eared .to..be .in.....yerY. good Gondition, as <br /> no visual signs of leakage were noted. For these reasons, <br /> representatives from Groundwater Technology and the San Joaquin <br /> nj <br /> /�;PLocal :Health, District determined that excavation of the miner <br /> amount of contaminated .soil was unnecessary. Following the <br /> removal of the tanks and collection of soil samples, the excava- <br /> tion was' backfilled with clean fill. <br /> e <br /> r- <br /> The five soil samp' is from the fuel tank excavation were . <br /> sent to Trace Analysis Laboratory Inc. in Hayward, California <br /> B <br /> r. <br /> :1111111111im slim <br />