Condit Dam Removal Condit Dam Removal - Access Washington

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Condit Dam Hydroelectric Project Final Supplemental EIS b. L 25 = the sound level exceeded during 25 percent of the measurement period (i.e., 15 minutes per hour) c. L 8.33 = the sound level exceeded during 8.33 percent of the measurement period (i.e., 5 minutes per hour) d. L 2.5 = the sound level exceeded during 2.5 percent of the measurement period (i.e., 1.5 minutes per hour) Noise sources covered by this regulation would include voices (e.g., yelling, shouting, etc.), horns or sirens (unless used as a warning device or required by law), motor vehicles and construction equipment. Noise generated by operations at the project site would be required to comply with SCC 8.22.090. However, the noise emanating from the Proposed Action area during construction activities would largely be exempt from the SCC regulations. The following would be exempt from the provisions of SCC 8.22.090 under the specified conditions: • Sounds created by blasting operations between the hours of 7:00 am and 10:00 pm • Sounds created by vehicles operating for onsite construction between the hours of 7:00 am and 10:00 pm • Sounds created by motor vehicles when operated on public roadways • Sounds created by motor vehicles when operated off public roadways (e.g., on the project site), except when such sounds are received in residential properties • Sounds created by warning devices not operated continuously for more than five minutes • Sounds created by safety and protective devices where noise suppression would defeat the intent of the device or is not economically feasible Washington State Regulations 3 As they apply to the Proposed Action, the noise regulations enforced by Ecology (WAC 173- 60) are identical to the Skamania County regulations described in Section 4.8.1. 4.8.2 Impacts Anticipated Noise Sources As stated previously, the blasting and construction noise to be generated by the Proposed Action are not specifically regulated by Klickitat County, and are exempt from the maximum permissible noise levels enforced by Skamania County and Ecology. However, in order to satisfy the requirements of SEPA, URS assessed anticipated noise levels in the vicinity of the Proposed Action area due to construction activities. 3 Note that state and local regulations would apply if not preempted by the Federal Power Act. 4.8-3
Condit Dam Hydroelectric Project Final Supplemental EIS Based on the project description and management plans provided by PacifiCorp, URS assembled an inventory of operations and equipment that would generate noise during each phase of construction. Table 4.8-2 summarizes the operations associated with the Proposed Action, and the types and numbers of equipment that are expected to be operating during each phase of work. Reference noise emission data for blasting and each piece of equipment (compiled during previous construction noise assessments conducted by URS for similar projects) are also summarized in Table 4.8-2. For the purposes of this assessment, each piece of equipment was assumed to operate continuously during daytime hours (defined by Skamania County and Ecology as 7:00 am to 10:00 pm), Monday through Friday. Predictive noise modeling and potential noise impacts for each activity related to the Proposed Action are described in the following sections. Table 4.8-2 Anticipated Noise Sources Action Pre-Dam Removal Activities Hardware Removal & Tunneling Dam Breaching & Removal Concrete Dam Demolition Concrete Removal, Storage, Disposal Coffer Dam Removal Wood Stave Pipeline Removal & Disposal Concrete Surge Tank Removal & Disposal Power Facilities Removal & Disposal Sources Reference Noise Level Reference Distance Number On Site Blasting 122 dBPeak a ¼ mile c NA Drill rig 74 dBA b 200 feet 1 Rough terrain crane 88 dBA 50 feet 1 Barge-mounted clamshell crane 88 dBA 50 feet 1 Loader 85 dBA 50 feet 2 Excavator 82 dBA 50 feet 2 Dozer 85 dBA 50 feet 2 Truck 88 dBA 50 feet 10 Pickup 72 dBA 50 feet 2 Blasting 122 dBPeak NA NA Crane 88 dBA 50 feet 1 Loader 85 dBA 50 feet 2 Dozer 85 dBA 50 feet 2 Truck 88 dBA 50 feet 10 Pickup 72 dBA 50 feet 2 Crane 88 dBA 50 feet 1 Loader 85 dBA 50 feet 2 Excavator 82 dBA 50 feet 2 Scraper 89 dBA 50 feet 2 Dozer 85 dBA 50 feet 2 Truck 88 dBA 50 feet 10 Pickup 72 dBA 50 feet 2 Blasting 122 dBPeak NA NA Crane 88 dBA 50 feet 1 Loader 85 dBA 50 feet 2 Dozer 85 dBA 50 feet 2 Truck 88 dBA 50 feet 10 Pickup 72 dBA 50 feet 2 Loader 85 dBA 50 feet 2 Truck 88 dBA 50 feet 10 Pickup 72 dBA 50 feet 2 Blasting 122 dBPeak NA NA Drill rig 74 dBA 200 feet 1 Loader 85 dBA 50 feet 2 Excavator 82 dBA 50 feet 2 Scraper 89 dBA 50 feet 2 Truck 88 dBA 50 feet 10 Pickup 72 dBA 50 feet 2 Loader 85 dBA 50 feet 1 Dozer 85 dBA 50 feet 10 Pickup 72 dBA 50 feet 2 4.8-4
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Condit Dam Removal Final SEPA Suppl
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March 23, 2007 Dear interested part
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Condit Dam Hydroelectric Project Fi
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Appendix C Supplemental Aquatic Res
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Agency and Organization Letters and
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Agency and Organization Letters Con
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Contents Public Meetings Response P
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Contents Individuals Individuals A-
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