Condit Dam Removal Condit Dam Removal - Access Washington

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