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RAW—/", �t PE' HEAT TN 1 ��#rWorking To Restore Nature 1710 Main Street 4 `t OCT P11 2: 23 Escalon, CA 95320 Phone: (209) 838-3507 FAX: (209) 838-3509 1 i Y October 1, 1993 Mr. Anthony Mendes Permit Services Division San Joaquin Valley Unified Air Pollution Control District 4230 Kiernan Avenue, Suite 130 Modesto, CA 95356 RE: Permit to Operate No.,N-2303-1-0 at Western Stone Products Facility, 1100 Lowe Road, Hughson, California Dear Mr. Mendes: Western Stone Products has ;`pproximately 375 to 400 cubic yards of diesel contaminated soil that was excavated from a former underground storage tank location. The soil is currently stockpiled at Western Stone Products' Tracy facility in San Joaquin County (Figure 1). Western Stone Products proposes to dispose of the soil by transporting it to Western Stone'Products' Hughson facility in Stanislaus County, processing it through their asphalt batch plant"and using it as roadbase. Excavation activities were conducted in October 1992. Excavated soil was stockpiled on-site; the location of the stockpiled 'soil, the estimated volume in each pile, and the soil pile sampling locations are depicted on Figure 2. Two soil samples were collected from each 50 cubic yards of soil, composited by a state-certified laboratory and analyzed for total petroleum hydrocarbons as diesel (TPHd) and benzene, toluene, ethylbenzene, and xylenes (BTEX). Laboratory results indicated the following: TPHd concentrations ranged from 2.6 to 25 parts per million (ppm) with an average of 10.38 ppm; benzene concentrations ranged from non detect (ND, <0.005) to 0.015 ppm with an average of 0.006 ppm; toluene concentrations ranged from ND'', <0.005 to 0.12 ppm with an average of 0.024 ppm; and, xylene concentrations ranged from ND, <0.005 to 0.30 ppm with an average of 0.054 ppm. Results are shown in Table 1 and laboratory reports are contained in Attachment 1. k L-100193.FNL � I i� _ a