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Review of Blasting Operations of Summit $rick <br />ANALYSES of BLASTING IMPACTS, 2.2 cons' <br />In order to prevent any chance damage to the overhead lines or to the public using the <br />roads, AG recommends the following control measures: <br />All blastholes should be stemmed with at least two (2) feet of packed dirt before they <br />are shot. <br />2. No blasting will occur within 750 ft. of State Highway 9, or 100 ft. of Pickney or <br />Siloam Rds and 25 ft from Fremont County Road 62 at the 8-Mile mine. <br />3. In preparation of shooting within 1000 ft. of a public road, guards wearing orange <br />vests and using flags, should halt traffic in both directions from a distance of/, mile. <br />By using extreme cautious and the controls list above, the blasting and other mining <br />activities at the Summit Brick Ciay Mines should have no negative impacts on adjacent <br />roads and overhead power lines. <br />2.3 Control of Blast Noise <br />This section is a review of current blast noise monitoring technology, and discusses the <br />potential impacts on neighboring people and structures, and presents recommended blast <br />noise controls. <br />2.3.1 Blast Noise (Airblast) Monitoring Scales: <br />Blast noise at its highest intensity usually occurs at frequencies below that of human <br />hearing (<20 Hz). Because of this, instruments that measure impulsive blast noise or <br />"airblast" are capable of recording at very low frequencies, typically down to 2 Hz. When <br />measurements include low frequency noise with a flat response, they are called "linear <br />scale" measurements. <br />Since full-range recording of blast-induced noise can only be done with linear scale <br />instruments, it is imperative that compliance specifications for blast measurements also be <br />expressed in linear scale. Below, Figure 2.5 shows the U.S. Bureau of Mines table of Air <br />Blast Limits. <br />20 <br />