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26 May 1998 <br />AGE -NC Project No. 97-0326 <br />Page 3 of 5 <br />3.4. OVEREXCAVATION <br />On 24 March 1998, the UST excavation was enlarged for the installation of a new UST (section 3.5., <br />below). Approximately 12 cubic yards of "clean" soil was removed from the northern end of the <br />excavation. Each scoop of "clean' soil was observed for the presence of hydrocarbon odor and <br />discoloration and was monitored with an organic vapor meter equipped with a photo -ionization <br />detector (PID: Thermo Environmental 580A, 10.0eV, calibrated to isobutylene). <br />The excavation was extended to a depth of approximately 15 feet bsg and a length of approximately <br />45 feet. Due to space limitations at the site, soil excavated from the UST and piping installation was <br />transported by Lutrel Trucking to Forward, Inc. along with stockpiled impacted soil generated during <br />the UST removal. A total of 341.18 tons (approximately 260 cubic yards) of soil was transported for <br />disposal. Soil transport weigh tickets are included in Appendix C. Approximately 50 cubic yards of <br />clean soil was also transported off-site. <br />On 30 March 1998, six samples were collected from the stockpiled soil, transported to AAL under <br />chain -of -custody, eomposited into two samples and analyzed for TPH-g and BTE&X in accordance <br />with EPA Methods 5030 and 8020, respectively. Sampling procedures were outlined in Section 3.2. <br />above. <br />3.5. UST INSTALLATION <br />On 26 March 1998, one 20,000 -gallon UST was installed at the site. The new UST was installed at <br />the location of the former USTs and excavation as described in Section 3.4. above. UST, piping and <br />dispenser installation was performed by Stokley Construction. In anticipation of additional <br />investigation at the site, two 12 -inch diameter PVC conductor casings were installed during the UST <br />installation. The conductor casings were installed in the UST excavation through the pea gravel and <br />covered with traffic -rated boxes. The site is currently in operation as a gasoline service station. <br />4.0. FINDINGS <br />4.1. UST REMOVAL <br />All three USTs appeared to be in fair condition upon removal with no holes observed. Obvious field <br />indications of hydrocarbon -impacted soil were observed in the soil immediately surrounding the <br />USTs and product piping. <br />Advanced CeoEnvironmental. Inc. <br />