DOE/EIS-0332; McNary-John Day Transmission Line Project Draft ...

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3 3-114 Affected Environment, Environmental Consequences, and Mitigation Table 3-21. Construction Equipment Noise Associated with the Proposed Project Type of Equipment Maximum Level (dBA) at 50 Feet Road Grader 85 Bulldozers 85 Heavy Trucks 88 Backhoe 80 Pneumatic Tools 85 Concrete Pump 82 Crane 85 Combined Equipment 89 Source: Thalheimer 1996. The overall noise caused by the conventional equipment involved in construction is estimated to be 89 dB Leq at a reference distance of 50 feet. Noise produced by construction equipment would decrease with distance at a rate of about 6 dB per doubling of distance from the site. Based on that assumed attenuation rate, Table 3-22 shows the estimated construction noise levels at various distances from the construction site. Table 3-22. Construction Noise in the Vicinity of a Representative Construction Site Distance from Construction Site (feet) Hourly Leq (dBA) 25 83 50 89 100 83 200 77 400 71 800 65 1600 59 Note: The following assumptions were used: Equipment used: (1) each- grader, bulldozer, heavy truck, backhoe, Pneumatic tools, concrete pump, crane Reference noise level: 89 dBA (Leq) Distance for the reference noise level: 50 feet Noise attenuation rate: 6 dBA/doubling This calculation does not include the effects, if any, of local shielding or atmospheric attenuation. BPA McNary-John Day Transmission Project Draft EIS February 2002
BPA McNary-John Day Transmission Project Draft EIS February 2002 Noise Although daytime construction activities are excluded from noise regulations, for this evaluation it was assumed that construction noise levels exceeding the Washington state limits for permanent industrial operations would constitute a temporary (several days at most), environmental impact. The Washington noise limit for noise levels at residential areas caused by permanent daytime industrial operations is 65 dBA. Construction noise levels would exceed Washington Department of Ecology daytime industrial operations limits at distances up to 400 to 800 feet from construction activity. Residential land use adjacent to the transmission line corridor is of low density and consists of single-family houses and houses with barns and accompanying outbuildings. The residences are concentrated in the cities of Plymouth (corridor mile 4, structure 4/1), Paterson (corridor mile 16, structures 16/1 to 16/5), and North Roosevelt and West Roosevelt (corridor miles 48 and 49, respectively) in Washington, and the cities of Umatilla (corridor mile 1) and Rufus (corridor mile 78) in Oregon. Single residences, small groupings of houses, or small farm complexes are located in the vicinity of structures 6/1, 7/2, 10/4, 22/3, 29/3 by Crow Butte Park, 30/1, 68/1, 68/5, and 69/4. Of these homes, approximately 19 could be affected by noise from construction of the proposed project. These 19 homes would be within approximately 600 feet of construction activity and may experience noise levels at or above 65 dBA. If helicopters are used to install the towers, a wider range of residences could be affected. Noise levels generated during erection of each tower would depend on the type of method used. If conventional construction methods were used to erect the towers, then the noise levels would be comparable to those listed in Table 3-22. However, Bonneville’s construction contractor may elect to use a large helicopter (such as the Sikorsky S-64 Sky-Crane) to assist with tower erection. In that case, all of the towers would be preassembled at one or more central staging areas, then a helicopter would transfer the assembled towers from the staging area to the remote tower sites. The helicopter would hover at each tower site for a total of 2 to 10 minutes during a 1-hour period while the tower sections are placed on the foundation. In addition, the helicopter would hover at the central staging area for 2 to 5 minutes per tower as it picked up each tower section. Assuming helicopters were used to erect all 360 towers, a total of 12 to 60 hours of hover time would be required over several weeks and several sites. A loaded cargo helicopter flying 250 feet away produces roughly 95 dBA, which is the same amount of noise produced by a diesel locomotive 100 feet away (Helicopter Association International 1993). Homes within approximately 1 mile of the helicopters would be exposed to temporary noise levels above 65 dBA. However, helicopters operated during the daytime to support construction activity are exempted from Washington state noise regulations. Possible occasional midday blasting might be required at some tower sites in rocky areas where conventional excavation of tower footings was not practical. Blasting would produce a short noise like a thunderclap that could be audible for 0.5 mile or more from 3-115
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McNary-John Day Transmission Line P
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ii Maintenance.....................
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List of Figures S-1 Vicinity Map ..
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3-17 Sensitive Wildlife Species Pot
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Summary problem of lack of power, p
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BPA McNary-John Day Transmission Pr
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Alternatives BPA McNary-John Day Tr
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Mitigation BPA McNary-John Day Tran
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Environmental Consequences—Propos
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Vegetation Affected Environment BPA
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Operation and Maintenance BPA McNar
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Cultural Resources Affected Environ
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Socioeconomics, Public Services, an
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Transportation Affected Environment
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Environmental Consequences—Propos
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Table S-2: Summary of Impacts of Sh
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Transmission Infrastructure BPA McN
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Plymouth Generating Facility BPA Mc
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Chapter 2 Proposed Action and Alter
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2 2-2 Proposed Action and Alternati
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2 2-10 Proposed Action and Alternat
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Table 2-3: Summary of Impacts and M
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Chapter 3 Affected Environment, Env
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State Senator and Representatives J
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Media East Oregonian (Pendleton) Go
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Chapter 7 List of Preparers The McN
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Galan McInelly—Geologist. Respons
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Chapter 8 Glossary and Acronyms Glo
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Pithouse: a semi-subterranean “ea
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Ecology Washington State Department
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Appendix A Agency Correspondence an
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BPA Tribal Policy April 1996 It is
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8. Strive to develop and achieve mu
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• Provide assistance in establish
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> > > Chris Soncarty > Fisheries Bi
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Appendix B Public Involvement � L
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Most of the comments (45%) focused
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We do not plan to give a formal pre
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Mtg1 1 Need What is driving the nee
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Letter 1 Need The Pacific Northwest
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Mtg1 1 Need Nuclear is safe. Mtg1 1
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Mtg1 1 Process What happens if I do
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Mtg2 2 Alternatives What about goin
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Mtg1 2 Construction We have telepho
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Mtg2 2 Description Will this line b
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Letter 3 Cultural Resources Mtg1 3
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Mtg1 3 E-social Feel sorry for folk
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Mtg2 3 Landuse I'll need to remove
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Mtg1 3 Public Health We get shocked
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Form 3 Vegetation I am distressed t
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Mtg1 3 Wildlife Needs mitigation fo
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Appendix C Common and Scientific Na
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Appendix D Common and Scientific Na
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D D-2 Common and Scientific Names o
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Appendix G Electric and Magnetic Fi
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Bonneville Power Administration/ Mc
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Table of Contents Bonneville Power
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1.0 Introduction Bonneville Power A
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Bonneville Power Administration/McN
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List of References Cited Bonneville
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List of Preparers Bonneville Power
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Table 2, continued Bonneville Power
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Table 2, continued Bonneville Power
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Figure 1, continued c) Proposed lin
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Figure 1, continued Bonneville Powe
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Index 1 100-year floodplain .......
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Glade Creek.......S-9, S-12, 3-8, 3
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scoping .................S-7, 1-4,
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