TagWAC(42)

A Des Moines resident's formal comment argues that the Seattle-Area Metroplex Environmental Impact Statement's noise analysis is legally inadequate because it relies solely on a federal FAA noise threshold rather than Washington State's own multi-factor significance standard. The comment contends that the standard noise metric used (DNL) masks the real impact of roughly 96 additional daily flights projected by 2037, since it averages out individual disturbance events rather than counting them. The commenter calls for supplemental analysis using alternative metrics—such as single-event sound levels and nighttime averages—supported by peer-reviewed health studies linking aircraft noise to sleep disruption and cardiovascular harm.

Des Moines resident Jeffrey Bogen submitted a formal comment arguing that the Seattle-Area Metroplex Environmental Impact Statement's noise analysis is legally inadequate because it relies solely on a federal average-noise metric (DNL) rather than Washington State's broader, multi-factor significance standard. Bogen contends that with roughly 96 additional flights per day projected by 2037, residents will experience more frequent individual noise disruptions — including sleep disturbance and cardiovascular stress — that the DNL metric is mathematically incapable of detecting. He calls on the Port of Seattle to supplement its Final EIS with event-level and nighttime noise metrics supported by peer-reviewed health research, including the FAA's own National Sleep Study.

This document outlines Washington State campaign finance laws related to political contributions, coordination, and reporting requirements. It defines when an expenditure made by a third party counts as a campaign contribution — particularly when made in coordination with a candidate or political committee — and sets out registration and disclosure deadlines for political committees. These rules govern how campaigns and political organizations must track and report donations and spending.

Exhibit 137 (AR 018038), WAC 173-201A-050, Title 173 Washington Administrative Code, Washington State Department of Ecology ambient water quality criteria footnotes. Covers dissolved metals criteria, weak acid dissociable cyanide method (Standard Methods 4500-CN I), total recoverable effluent limits, conversion factors, water effects ratio approach (USEPA Water Quality Standards Handbook December 1983), site-specific metals adjustment, seasonal

Resolution No. 3211 of the Port Commission of the Port of Seattle, King County, Washington, repealing sections 15.4 and 21 and subsections 21.1, 21.2, 21.3, 21.4, and 21.5 of Port Resolution 3028, and adopting new SEPA administrative appeal procedures under ch. 43.21C RCW and chapter 197-11 WAC. Establishes appealable SEPA decisions (EIS adequacy and issuance

This Washington State administrative regulation establishes rules for 'mixing zones,' which are designated areas in bodies of water where pollutant discharges are allowed to mix and dilute before meeting water quality standards. The rules set strict size limits for mixing zones in rivers, estuaries, lakes, and ocean waters, and require that dischargers apply all available pollution-reduction technology before a mixing zone is approved. Special provisions are also included for storm water discharges and combined sewer overflows.

This technical document from a March 25 meeting discusses stormwater mixing zone analysis for proposed outfalls around Seattle-Tacoma International Airport (STIA). Because standard stream flow conditions (7Q10 and 30Q5) are extremely unlikely to coincide with stormwater discharge events, Parametrix proposed a site-specific approach using higher-probability rainfall-based discharge combinations instead. The analysis found that reasonable dilution of 14- to 24-fold could occur within about 15 to 20 meters downstream, though complete mixing requirements would exceed standard regulatory width and flow percentage criteria, prompting a request for exceptions under WAC 173-201A-100.

Exhibit AR033807, WAC 173-340-747 soil concentration calculations for ground water and surface water protection under the Model Toxics Control Act (MTCA), SeaTac Third Runway Embankment Project. Tables derive cleanup levels for hazardous substances including antimony, arsenic, beryllium, cadmium, chromium +3, chromium +6, copper, mercury, nickel, selenium, silver, thallium, zinc, and lead using Equations 747-1 and