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r <br /> S <br /> Coca-Cola Enterprises - West <br /> Job No. 90051 <br /> In order to purge any remaining hydrocarbon vapors,approximately 25 pounds of dry ice was <br /> placed in the 1,000-gallon tank and 170 pounds of dry ice was placed in the 10,000-gallon tank <br /> prior to removal. Receipts documenting purchase of the dry ice are included in Appendix A. <br /> The final authorization for the removal of the USTs was given by Mr. Ron Hiltscher of the City <br /> of Stockton Fire Department. The fire department permits for the UST removal are also <br /> included in Appendix A. The UST removals aim shown in Photograph Nos. 5 and 6. <br /> After removal, the exterior of each tank was visually inspected for areas of obvious corrosion. <br /> Although minor,oxidation was observed around.the 10,00 -gallon diesel UST.,'severe corrosion <br /> w. <br /> was not observed (Photograph No. 7). They 1,0(1(3-gallon gasoline UST showed signs of severe <br /> corrosion.; Oiie hole, about 1/2-inch in diameter (Photograph No. 8), was discovered in the <br /> 1,000-gallon UST. Both USTs were transported by Crisp Construction to Levi's iron and Metal <br /> Co., Fresno, California to be cut up and recycled. Copies of the transportation manifest and <br /> tank destruction certificate are presented in Appen--dix A. <br /> The excavated soil was stockpiled on visqueen adjacent to the excavation and will be aerated <br /> on-site pending permit approval. After removal of the tank,the.excavation was backfilled,with <br /> clean imported sand fill: The excavation area was then resurfaced with 6 inches of concrete. <br /> The soil stockpile and final condition of the diesel UST excavation are shown in Photograph <br /> Nos. 9 and 10, respectively. <br /> — 4.0 SOIL SAMPLING PROCEDURES <br /> Four soil samples were collected from below the USTs on April 19, 1990 by USTEC personnel. <br /> Sampling procedures were observed by Mr. Charles Hunt of the San Joaquin County Public <br /> Health Services. The samples were collected using a decontaminated 2S-inch outside diameter <br /> (O.D.) harkd-driven sampler containing one 2-inch by 6-inch brass sample retainer. Two soil <br /> samples were collected from each end of each excavation at a depth of about 2 feet below the <br /> - tank invert. The sample locations are shown on Figure 3 and Figure 4. <br /> 3 <br />