TagWater Quality(478)

In August 2001, Washington State's Department of Ecology issued a 401 water quality certification to the Port of Seattle for the proposed SeaTac Third Runway, permitting construction of an 8,500-foot parallel runway involving fill of nearly 20 acres of wetlands and development of 700 acres of upland area. The certification imposed strict stormwater management and wetland mitigation conditions, including 201 acres of wetland creation and riparian restoration. The certification was subsequently appealed by the Airport Communities Coalition on August 23, 2001, with a hearing before the Pollution Control Hearings Board scheduled for March 2002.

Transmittal form dated September 6, 2001 from Paul S. Fendt, P.E. of Parametrix (Kirkland, WA) to Ann Kenny at the Washington State Department of Ecology (Bellevue, WA 98008), transmitting wetland hydrology monitoring data for Port Of Seattle, Project Number 556-2912-001 01 03. Includes Lake Reba Area water level data tables for monitoring wells HC00-B151, HC00-B152,

Annual Stormwater Monitoring Report for Seattle-Tacoma International Airport (STIA), prepared by Scott Tobiason, Environmental Management Specialist, Aviation Environmental Programs, Port of Seattle, covering the period July 1, 2000 through June 30, 2001. Report includes NPDES stormwater monitoring data for Sea-Tac Airport storm drainage subbasins, grab and composite sample results for total petroleum hydrocarbons (TPH), fecal

This technical memo evaluates whether lead and zinc levels found in cutthroat trout from Miller Creek pose a risk, arguing that standard tissue screening concentrations are not appropriate for trout. Using fish-specific toxicity data and bioconcentration factors, the authors derive alternative thresholds and conclude that measured metal levels in the trout fall well below harmful concentrations. The document recommends using species-specific methods rather than generic screening values when assessing metal risks to fish.

Annual Stormwater Monitoring Report prepared by Port Of Seattle pursuant to Special Condition S2.E of the NPDES permit for Seattle-Tacoma International Airport (STIA), covering July 1, 2000 through June 30, 2001. Report covers 14 outfalls per permit condition S2.B; 61 grab and 59 composite samples from 22 storm events; 7-year cumulative totals exceed 400 samples

Response to Comment #16 by David DeForest to Linda Logan (September 2001) critiquing Shephard (1999) tissue screening concentrations (TSCs) for lead (0.32 mg/kg dw) and zinc (100 mg/kg dw) as applied to cutthroat trout from Miller Creek. Argues Shephard TSCs derived from EPA water quality criteria and bioconcentration factors (BCFs) are not appropriate for cutthroat

Confidential discussion draft talking points prepared by Curt Hart (Ecology) for the Third Runway Section 401 water quality certification permit appeal filed by the Airport Communities Coalition (ACC) to the Washington State Pollution Control Hearings Board (PCHB). Document addresses Ecology’s defense of the permit issued to Port Of Seattle for construction of a third runway

Internal Ecology meeting notes and talking points dated 8/16/2001 regarding the 401 Water Quality Certification issued for the Third Runway project at Sea-Tac Airport. Ecology staff prepared responses to Port Of Seattle concerns about the certification’s open-ended conditions, covering topics including NPDES major modification, stormwater retrofitting, wetland mitigation, Water Effects Ratio (WER) Study, Walker Creek

This document outlines Washington State Department of Ecology conditions for accepting imported fill material used in construction of Sea-Tac Airport's Third Runway and associated Master Plan improvements. It requires the Port of Seattle to submit environmental assessments of fill sources — including records reviews, site reconnaissance, and soil sampling for hazardous substances such as arsenic, lead, and mercury — at least ten business days before placing any fill. Specific contamination limits (e.g., arsenic at 20 mg/kg, lead at 220/250 mg/kg) and minimum sampling schedules based on fill volume are established to prevent toxic materials from entering state waters and wetlands.

Dr. Peter Willing, a water resources expert, submitted this declaration opposing the Department of Ecology's water quality certification for Sea-Tac Airport's proposed third runway construction. He argues that the certification relies on vague future performance expectations and unresolved contingency plans that fail to provide reasonable assurance that water quality standards will be met. His key concerns include the Port of Seattle's flawed low streamflow analysis and inadequate stormwater management plans that could perpetuate ongoing water quality violations in nearby Class AA streams.