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1 <br />1 <br />1 <br /> <br /> <br /> <br />1 <br />1 <br />1 <br /> <br />1 <br />1 <br />1 <br /> <br />1 <br />1 <br /> <br />1 <br />IJ <br />Move the soil and surficial materials now blocking the normally dry <br />channel that enters the quarry from the northeast to allow run-off <br />to flow unimpeded through the channel. Provide for storm run-off to <br />pass from this watershed into Strain Gulch without obstruction, and <br />without eroding quarry roads. <br />Atmosphere <br />Nature of Impacts <br />No phase of the operation will affect weather or climate; but all phases <br />have a detrimental impact on air quality, Table 1. As air quality <br />and noise are being studied by other consultants, they will be discussed <br />only briefly here. <br />Sources of air pollutants are: <br />1. Internal combustion engines used in mining, crushing, road <br />construction and hauling. <br />2. Dust from the crusher, the stockpiles and from mining. <br />3. Noise, primarily from mining and crushing. <br />Of the pollutants produced at the quarry, dust is serious on-site, close <br />to the crusher and sorter. 6lorkers in the dust area wear protective <br />respirators. <br />Pollution from the quarry is not likely to be significant off-site for <br />the following reasons: <br />1. The site is remote from most habitations. The nearest occupied <br />house is 3/4 mile east of the quarry. <br />2. Only strong westerly winds will move dust off-site to the east, <br />in the direction of the habitations. <br />3. Under strong wind conditions other pollutants are swept away <br />rapidly; there is no build-up. <br />4. Testing of noise has found no detectable increase in noise levels <br />beyond 1/4 mile from the quarry. Noise levels are increased in <br />parts of the nearest unit of the Denver Mountain Parks, but not <br />at any habitations. (Letter of March 20, 1975 from Kenneth lJ. <br />Carlson, Colorado School of Plines to Dale Ream, Cooley Gravel <br />Company). No neighbors have ever complained of noise. <br />5. Dustfall was collected from July G, 1972 through May, 1974 at fui~~ <br />locations around the quarry. Dustfall was analyzed monthly thr,~~~•,~ <br />July 13, 1973 and quarterly thereafter. At a dust collecting <br />station at the western edge of the quarry dustfall was about twi~~ <br />as much as at a busy intersection in an urban area. At all nthc~~ <br /> <br />