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i <br /> any adverse effect , either individually or cumulatively on <br /> wildlife resources . <br /> Mitigation Measures: <br /> None proposed. The project will have a de minimis effect on <br /> fish and wildlife, and therefore a Certificate of Fee Exemp- <br /> tion will be filed with the County Clerk. <br /> 4 . Air/Climate <br /> Deterioration of Existinq Air Quality Including Creation of <br /> Objectionable Odors <br /> Setting: <br /> Upon arrival at the project site, contaminated soil will be <br /> stockpiled and covered with a plastic tarp to await process- <br /> ing. This soil will contain less than 5% hydrocarbons by <br /> volume. <br /> The soil treatment process involves two Circulating Bed <br /> Combusters (CBC's) in which contaminated soil is subjected <br /> to turbulence (mixing of heated air and soil material ) , <br /> temperature ( burning of natural gas to heat the soil mate- <br /> rial , and time (to allow complete combustion of the chemical <br /> contaminates within the soil . This process is a closed <br /> system in which the contaminated soil is transported to the <br /> CBC in an enclosed conveyor ( in order to contain any fugi- <br /> tive dust or odors) whereupon the material is transferred to <br /> the closed combustion vessel for thermal processing. Flue <br /> gases are directed through fabric filters in the Baghouse <br /> where particulates are collected. Remaining gases are <br /> released to the atmosphere through the combuster stack where <br /> total hydrocarbons (THC) , oxides of nitrogen (NOx) , and <br /> oxides of sulfur (SOx) are continuously monitored. Treated <br /> soil is transported in an enclosed conveyor to a storage <br /> shed ( free standing metal building) for temporary storage <br /> and water spray to eliminate fugitive dust . Treated soil is <br /> then stored on-site in tarpaulin covered piles prior to <br /> shipment to recipient sites. <br /> Analysis: <br /> Insignificant levels of air emissions from the site will be <br /> released from the combuster stack and from surface evapora- <br /> tion of the contaminated soil stockpile. Based on emission <br /> results from a test stockpile, the Applicant has predicted <br /> that the contaminated soil stockpile will yield a , daily <br /> total petroleum hydrocarbon (TPH) volatization of 5 pounds <br /> per day; which is far less than the total allowable site <br /> hydrocarbon release rate of 150 pounds per day, as per Air <br /> Pollution Control District guidelines (Report of Waste <br /> Discharge, SSTF; May 1990; page 46) . <br /> 22 <br />