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' Gravel Characteristics <br />Physical testing of a pit run sample (See Attachment 4) indicates <br />I <br />a silt content of only .7% which is far below the value of 12% for <br />gravel roads listed in Reference 1. Since the amount of suspendible <br />particulates in the gravel is almost negligible the potential for <br />emissions during mining and processing is similarly negligible. <br />Emissions Calculations - Uncontrolled <br />Mining activities which may cause emissions include the bulldozer <br />and the front end loader operations, the crushing and screening <br />operation, gravel loadout, scraper activities, and movement of the <br />haul trucks. <br />1. Bulldozer Operation - Reference 2 <br />Bulldozer projected travel distance is less than one mile per day. <br />From Reference 2 the emissions factor, EF, is: <br />0.8 <br />E.F. = 5.9 ( 12 ) ( 30 )((~) (365) lb miles-' <br />where <br />s = average vehicle speed, mph = 2 <br />w = vehicle weight, Tons = 15.5 <br />s = silt content, % _ .7 <br />d = dry days/year = 247 (Ref. 1) <br />.8 <br />EF = 5.9 ( 12 ) ( 30 ) (1535 ) (365) <br />_ .057 lb mile-' <br />Emissions per year (E) are <br />E _ .057 lb mile-' 1 mile day-' <br />_ .0074 tons/year <br />260 days/year-' 1 ton/2000 lb <br />