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are from wind erosion and the mining operation itself. <br /> Dust created by haul truck traffic is also a significant <br /> contributor. Watering of unpaved roadways will result in <br /> at least 50% control of vehicular dust. No credit has <br /> been taken in the emission calculations for wet dust <br /> suppression in handling, loading, or storage , though the <br /> gravel will usually be wet from washing. Maximum esti- <br /> mated dust emissions are 35 tons per year, annual average, <br /> and 10 lb/hour, 24-hour average rate. <br /> Gaseous pollutants will be released only as a result of <br /> operation of gasoline and diesel engines for trucks , <br /> . earthmoving equipment, generators , etc. The number of <br /> such vehicles or other sources operating on-site at any <br /> given time will be small; typically 3 diesel engines and <br /> 4 gasoline powered vehicles could be operating on-site at <br /> peak times. The contribution of carbon monoxide (CO) for <br /> example, from these vehicles would be approximately 3 g/sec. , <br /> resulting in a concentration of CO at a site boundary 300 m <br /> from center of operations of less than 100 Ug/m3. The EPA <br /> standard for a one-hour CO average is 40 , 000 ug/m3. Clearly, <br /> the contribution of gaseous pollutants from internal com- <br /> bustion engines associated with the operation will be <br /> negligible compared both to standards and to normal contri- <br /> butions of vehicles on typical streets and highways. <br /> c• <br /> G-11 <br />