SITE INFORMATION AND CORRESPONDENCE

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Covering the contaminated soil in the stockpile area will suppress any odors associated with the hydrocarbon contami- nants, as well as eliminate potential for fugitive dust . Likewise, the treated soil will be water sprayed to add moisture content and prevent particulates from entering the atmosphere. The treated soil will also be covered prior to transport off-site. All transport loads (both incoming contaminated soil and outgoing treated soil) will be cov- ered. Mitigation Measures: a. A modification to the existing Permits to Operate issued by the San Joaquin County Air Pollution Control District on February 28 , 1991 should be secured. b. A detailed Health Risk Assessment should be prepared for review and approval by the San Joaquin County Air Pollution Control District . C. A Dust Suppression Plan should be prepared for review and approval by the San Joaquin County Air Pollution Control District. 5 . Noise Exposure of People to High Noise Levels Increased Noise Levels Setting: The project components (including the Combuster, Cyclone, Baghouse, Soot Blower, Flue Gas Cooler, Air Skid, Air Cooled Exchanger and Feed Hopper) all generate noise levels in the 78-92 decibel, A-scale (dBA) range. With both CBC units operating simultaneously, it is anticipated that a composite noise level at a mid-point between the two units will be approximately 94 dBA. Analysis: Of primary concern is the noise exposure level for on-site personnel over a prolonged period of time. The Report of Station Information (SSTF; July 1991 ; page 60) indicates that noise levels for equipment will be in compliance with State requirements for an 8-hour time weighted average exposure. This would appear to be the case, although the noise exposure projections are near the maximum allowed. Noise protection measures for on-site personnel will need to be incorporated into the project.