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Yr yy <br /> 3.0 Scope of Work <br /> 3.1. Closed in Place UST <br /> The UST is under a concrete floor in the tranIsmission building. A portion of the <br /> floor above the tank was removed to allow p i obing to locate the tank and provide f <br /> dimensions for the geoprobe drill rig to secue the desired samples_ This probing <br /> established the presence of another concreteoor 3 ft. below the transmission <br /> building floor. Thus the location for the geo Irobe drill was calculated to be 9 ft. 4 <br /> in. from the center of the tank, as shown ine attached sketch. Fisch Drilling was <br /> contracted tosecure the required samples usinga geoprobe drill. The geoprobe <br /> drill was able to penetrate both concrete floo s and soil samples were obtained in <br /> plastic tubes at approximately S ft. 6 in. (1 ft below tank top), and 18 ft. 6 in. <br /> (below tank) of drill length operating at 30 d�grees from the vertical. The sample <br /> tubes were capped, labeled and placed in an iced chest for transport under chain <br /> of custody to Precision Enviro-Tech laboratory for analysis. The boring was filled <br /> with cement grout. The push drill did not pr duce any cuttings. This work was <br /> completed on February 26, 2007, under over ight by the Environmental Health <br /> Department. <br /> Analytical results are presented in Table 3.1 <br /> 3.2 Underground Storage Tanks <br /> Two USTs were found in the suspected locatIion and Stockton Service Station <br /> Equipment Co. was contracted to remove thelia. Soil was moved from above and <br /> around the tanks and stock piled on site, adjabent to the excavation. The tanks <br /> were inerted with dry lee, removed and placed onto a flat bed truck, and ' <br /> transported-to West Coast Equipment Co. in Turlock, CA for disposal. Soil <br /> samples were taken in 2 in. by 6 in_ stainless steel cylinders with plastic end caps. <br /> Five soil samples were taken, one from unde each end of each tank, and one from <br /> the stock:piled soil. Samples were labeled an placed in an iced chest for transport <br /> under chain of custody to Precision Enviro- tech laboratory for analysis. Clean fill <br /> was placed into the excavation to replace the tank volume, and the excavated soil <br /> was replaced and compacted. This work was completed on April 18, 2007, under <br /> 2 <br />