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• File No.2499-47 29 July 1991 Page 3 Again, no evidence of any buried items, backfilled soil, or potential sources of 7 contamination were uncovered. A soil sample was collected from the sidewall of the f1 7 excavation, from a depth of about a foot beneath the thickened footing. Given lack of evidence of contamination in this area, the sample, S-1, was not submitted for laboratory analyses. During the excavation work, Norby Construction (and its subcontractors) had exposed the edge of the concrete pad from the maintanence building. The pad ended approximately halfway between the mechanic's pit and the sumps. Based on this information, and the results of our investigation to date, we are confident that the magnetometer survey covered the former location of the underground fuel tanks. The survey detected no anomolies in this area which would be associated with abandoned tanks. Sumps. Directly west of the former Mandarin House Restaurant, was a single row of three drains. These drains were connected to sand and grease traps, installed as a part of the car wash operation. In our previous investigation, we were unable to penetrate the concrete pads surrounding the traps to inspect the subsurface conditions. When we arrived at the subject site on 23 July 1991, the sumps had been removed. The soil beneath the sumps had been left in place. We were informed that some sump water had been spilled in the northernmost sump during its removal. We observed no signs of contamination in the soil at this depth. We then requested that the sump areas be excavated to a depth of approximately 4 feet. A small volume of soil was unearthed in the northern sump which exhibited a slight petroleum odor; no such odor was noted in the soil excavated from the remaining two sumps. Samples were collected from the base of the three sumps (S-2, S-3, and S-4). The northern sump sample, S-2, was taken from the potentially contaminated soil. Chinese Restaraunt Pad. Our information indicated that a second set of sumps from 1 _ the car wash may have been built over during the construction of the Chinese restaurant. Upon arriving at the site, the pad from the restaraunt had been removed. T kb L We saw no evidence of sumps in this area. We were told that no unusual items were excavated from this area prior to our arrival. As we encountered no evidence of soil contamination in this location, no samples were collected. ANDERSCN CONSUL CONSULTING GROUP