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16 October 1996 AGE-NC Project No. 95-0165 Page 3 of 6 r dispenser areas. Analytical results of soil samples from the UST over excavation are included in ,•W Table 2. The laboratory report(McCampbell Analytical,Laboratory-ID 50116 to 50118) and chain- of-custody form are included in Appendix B. �. Excavated soil was stockpiled at the south end of the site. Soil excavated during the UST removal was subsequently moved to this area. Law 3.2. AERATION OF EXCAVATED SOIl. The stockpiled,soil was aerated for approximately six to seven months, under permit from the San Joaquin Unified Air Pollution Control District. One composite soil sample was collected in July 1995, to confirm the success of the soil aeration. Analytical results of stockpile soil sample; as summarized on Table 3, indicated the non-detection of TPH-g and BTE&X. Subsequently, the soil was used for on-site grading purposes. The laboratory report,,.(McCampbeli.Analytical Laboratory ID 5442 1) and chain-of-custody are included in Appendix C. 3.3. DRILLING AND SAMPLING - - On 09 May 1996, four soil borings were drilled at the site. Each boring was drilled using a truck- mounted HT-55 drill rig equipped with hollow-stem augers. The drill rig and two-man crew were P supplied by Soil Explorations Services, Inc. of Rancho Cordova, California. Borings B-1 and B-3 were advanced forty feet bsg.Boring B-2 was advanced to fifty-five feet bsg. Boring B-4 was drilled under the building to a vertical depth of twenty-three feet bsg at an angle of twenty degrees from vertical. Soil samples were collected from ahead of the drill bit using a split-tube sampler loaded with three pre-cleaned two-inch by six-inch brass sleeves. Samples were'collected at five-foot intervals, using Lao a 140-pound hammer to advance the sampler eighteen inches. The number of blows required to advance the sample in six-inch increments was recorded on the boring log. To avoid cross- contamination, the sampling equipment was washed in an alconox solution and rinsed twice with water prior to each sample run. The augers were steam-cleaned between borings. The leading soil-filled sleeve from each sampling nin was preserved for laboratory analysis. Both ends of the lead sleeve were covered with Teflon sheets, capped and sealed with tape. The samples were stored in a chilled container and transported under chain-of-custody to McCampbell Analytical Laboratory,Inc. (MAI)of Pacheco,California. Selected.samples were analyzed for TPH-g,BTE&X and methyl-tert-butyl ether (MTBE) in accordance with EPA methods 8015m, 8020 and 8020, respectively.