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HomeMy WebLinkAboutProposed MitigationProposed Nighttime Noise Mitigation Measures To limit the potential effect of construction-related noise at the residences near the HDD portal sites, several noise mitigation measures have been considered. The other mitigation measures listed can be considered part of a best management practice plan. Constructing a 16-foot tall noise wall around the perimeter of the portal site. The truck/equipment entrance will be placed to face away from houses and would not require a barrier Give at least 72 hour advance notice to nearby residents of the time periods when particularly noisy work and potential nighttime construction activities (e.g. pullback) will be occurring through mailers, door hangers, or other similar notification methods. Create and utilize a noise mitigation training program, which shall be implemented for all field-worker supervisory personnel including sub-contractor supervisors. (Required in construction contract.) Take noise level readings. At a minimum, the contractor will be required to take a base noise level reading before the start of construction activities, at the start of the drilling, and after noise mitigation measures have been installed. Equip all vehicles with ambient sensitive backup warning devices. The Contractor may use back-up observers in lieu of back-up warning devices for all equipment except dump trucks in compliance with WAC Chapter 296-155-610 and 296-155-615. The Contractor shall use back-up observers and back-up warning devices for dump trucks in compliance with WAC Chapter 296-155-640. Alternative Nighttime Noise Mitigation Measures If the above measures are determined to be insufficient, the following measures may also be implemented in an attempt to reduce the construction noise levels. Using acoustical blankets, pads, and/or boards to control metal-on-metal clanging noise or other banging noises that can occur while picking up drill pipe and setting on racks; moving the drill pipe from pipe racks, and making up the drill pipe. Offer to relocate the nearest residents during nights when construction activities would occur (e.g., during pullback) or during days with particularly noisy daytime activities (e.g., casing installation).