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W _ _A__MERICAN GEOLOGICAL SERVICES , INC . Environmental, Geological, and Natural Resource Consultants Colorado + California • Virginia + Hawaii Saipan M October 28, 1998 Ms. Margaret Lagorio,Lead Senior REHS Site Mitigation Unit San Joaquin County Public Health Services +� Environmental Health Division P.O. Box 388 Stockton, CA 95201-0388 V RE: Soil Aeration Results, Tracy Cold Storage, Tracy, California. Site Code 505329 Dear Ms. Lagorio, American Geological Services, Inc., on behalf of Western Refrigerating & Cold Storage Company, is pleased to present you with the results of the soil aeration program conducted at the Tracy Cold Storage site located in Tracy, California. The aeration program was designed to remove gasoline and gasoline constituents to levels suitable for on-site reuse of the soil. Based on recent analytical laboratory results, AGS believes that levels suitable for on-site reuse of the soil have been obtained. Gasoline, benzene, toluene and ethyl benzene levels were reduced ✓� to below analytical detection levels. Low levels of total xylenes were detected in several locations. A resampling event conducted nine days later in one of the sample grids, indicated no detectable levels of total xylenes. It is anticipated that the xylene levels will continue to decline, La however, the levels recently indicated are not believed to pose any threat to human health or the environment. Approximately 1,522 cubic yards of gasoline contaminated soil were excavated from the area surrounding a former underground gasoline storage tank during July and August 1998. The soil was stockpiled on top of plastic sheeting in the field adjacent to the excavation area for aeration. Prior to the placement of the contaminated soil, three soil samples were collected from the field and analyzed for gasoline and benzene, toluene, ethyl benzene and xylenes (BTEX). The results of these preliminary sample analyses indicated no detectable levels of analyzed constituents in the native soils of the field. The results of these analyses are presented in Table I below. Analytical laboratory data sheets are attached to this letter report. An authorization to conduct a soil aeration program was obtained from the San Joaquin Valley 40 Unified Air Pollution Control District. Based on their specified aeration limits, 30 cubic yards of contaminated soil were allowed to be placed onto the active aeration pile per day. Soil that was not being actively aerated remained covered with plastic sheeting to prevent the loss of volatile �.. constituents. Soil was added to the active aeration area using a bulldozer to move the soil into a thin layer. After moving the soil into the active aeration area, it was disced to break up the soil and allow the contaminants to volatilize. During high wind conditions discing was halted to reduce fugitive L. Telephone (209)532-8029 14847 Mono Way, Sonora, CA 95370 FAX(209)532-3809