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CNAPTERFIVE Draft EIS Rerrisions
<br />Page 4-35
<br />Impacts ofConstruction -Piceance Site, Parachute Site, and Product Pipeline
<br />Impacts from construction would be temporary and would result primarily from heavy equipment
<br />and vehicle traffic. The sound levels at a distance of 50 feet are presented in "Cable 4.6-2 for
<br />various types of construction equipment.
<br />Comparison of the estimated maximum noise levels listed in Table 4.6-2 for the Yankee Gulch
<br />Project with the ambient noise standazds listed in Table 4.6-1 indicates that the impacts would
<br />generally be within Industrial zone standards. Residential zone standards are likely to be
<br />exceeded for both daytime and nighttime conditions. However, the nearest residence is about 1
<br />mile from either the Piceance Site or the Pazachute Site (Steigers 1998a). Using the attenuation
<br />estimate of 6 dB(A) for each doubling of the distance from the source, the noise generated by
<br />industrial operations from either the Piceance Site or the Pazachute Site
<br />would be sufficiently attenuated to pemtissible daytime Residential zone levels [55 dB(A)] at
<br />about 0.3 mile. It would, drop below background noise levels [45 dB(A)] in approximately 1 .
<br />mile. Noise generated by Yankee Gulch Project construction activity should drop to allowable
<br />daytime Industrial zone levels [80 dB(A)] at a distance of 500 feet from the activity.
<br />Drilling activity would also cause some noise. A well pad takes approximately 2 days to
<br />construct. Well drilling at a particulaz solution mining well site would typically require 13 days
<br />to drill and complete. The noise attenuation would be calculated at 6 dB per doubling of distance
<br />for a point source. Assuming that a drilling rig has a 90 dB(A) noise level at 50 feet, then at
<br />approximately 2,300 feet, noise levels fall below the permissible daytime residential zone level
<br />(55 dB(A)), and at approximately 1 mile, noise levels fall below the permissible nighttime
<br />Residential zone level [50 dB(A)l. There aze currently no residences closer than approximately 1
<br />mile; therefore, the only receptors to be affected at levels higher than residential standards
<br />include wildlife and temporary visitors, such as seasonal hunters or recreational users. The
<br />actual impact distance may be much less due to other noise attenuating factors, such as varying
<br />ground surfaces, meteorological conditions, topographic variances, shielding effects, etc.
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<br />Impacts ofOperation -Piceance Site, Parachute Site, and Product Pipeline
<br />
<br />Noise impacts during field operations would also include vehicle traffic, welllhead operation, well
<br />workovers and drilling. Noise levels from these sources would be expected to be as high as 60 to
<br />90 dB(A) at a distance of 50 feet, similar to construction activities (Table 4.6-2). The nearest •
<br />residence is about 1 mile from the proposed noise sources. According to the ][tio Blanco County
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