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_ _+,~' <br />- ~:. <br />9. Blasting Plan <br />Limestone is quarried by developing benches in the <br />solid rock with the bench width being at least twice the <br />height of the high wall. Blasting of the benches to produce <br />shattered limestone is normally accomplished two or three <br />times a week. As many as one to two hundred 3" holes are <br />drilled about 20 feet deep a few feet apart in a bench. A <br />stick of dynamite (TOVEX) attached to primer cord is then <br />lowered to the bottom of each hole. The hole is then filled <br />to within about 6' of the surface with ammonia nitrate. The <br />top 6' is filled with dirt. An electric blasting cap is <br />used to set off the primer cord which in turn sets off the <br />dynamite and ammonia nitrate. This type of blasting produces <br />a relatively mild explosive boom and ground shock waves <br />travel relatively short distances. About a 20 foot layer of <br />a portion of the working bench is simply shattered in place. <br />Blasting will normally be accomplished late in the afternoon. <br />5. Dust Supression Plan <br />Roads, as well as the crusher and screening operations, <br />will be sprayed with water to suppress the dust. 'No other <br />air contaminants are produced during the quarrying and <br />hauling operations. <br />6. Truck Haul Plan <br />About twenty truck loads of limestone per 8 hour work <br />day will traverse the bottom of the small canyon leadinq <br />south from the quarry site for about ;mile where it will <br />join a graveled Forest Service access road for about ~ mile, <br />then along a paved city public street for a few hundred yards, <br />and then to Carbondale via State Highways 6 & 29 and 82 or <br />to other destinations via Inderstate Highway 70. <br />