Laserfiche WebLink
LI <br />' CRAPTERFOUR Enuironmema~ Consequences <br />' 4.6.2 Direct and Indirect Impacts <br />4.6.2.1 Proposed Action <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 aze presented in Table 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 standazds aze likely to be <br />exceeded for both daytime and nighttime conditions. However, the neazest 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 />heavy-duty truck travel from either the Piceance Site or the Pazachute Site would be sufficiently <br />attenuated to permissible daytime Residential zone levels [55 dB(A)] at about 0.3 mile. It would <br />drop below background noise levels [45 dB(A}] in approximately 1 mile. Noise generated by <br />Yankee Gulch Project construction activity should drop to allowable daytime Industrial zone <br />levels [80 dB(A)] at a distance of 500 feet from the activity. <br />' However, since construction activities would occur only during daylight hours, and background <br />levels in the Project Area are relatively low, the Ld„ average values are expected to be below the <br />significance levels. The actual noise levels experienced by a receptor would depend on the <br />' distance of the receptor from the construction activities. <br />Impacts from drilling activities would be expected to be similaz to those from construction. <br />' Monitoring done for similar projects (WCC 1988) indicates that noise levels fall below 55 dB <br />Ld„ at approximately 500 feet from a well pad. Thus, receptors located within 500 feet would be <br />impacted. <br />' Impacts of Operation -Piceance Site, Parachute Site, and Product Pipeline <br />' In addition to drilling and construction activities, the major noise sources during operation would <br />be the processing facilities. Each processing facility would include boilers, generators, pumps, <br />and compressors housed in an enclosure. Based on information provided by Caltrans (Hatano <br />' 1980), noise levels from the operation of such processing facilities would be approximately 90 <br />dB(A) at a distance of 50 feet (Table 4.6-2). However, the proposed use of enclosures for the <br />boilers, generators, pumps, and compressors would reduce noise levels during operation by <br />approximately 30 dB(A). Thus, noise from the processing facility operations would not be <br />expected to exceed the impact significance criteria. <br />Noise impacts during field operations would also include vehicle traffic, wellhead 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, similaz to construction activities (Table 4.6-2). The neazest <br />' residence is about 1 mile from the proposed noise sources. Public lands access to hunting, <br />Norse 4-35 <br />