TagPollution Control Hearings Board(1532)

A 2001 environmental review letter from Sheldon & Associates, commissioned by the Airport Communities Coalition, challenges the Port of Seattle's technical documents for the proposed Third Runway at Seattle-Tacoma International Airport. The review finds that the Port has not adequately demonstrated that massive fill placement and engineered retaining walls would avoid long-term damage to downslope wetlands, groundwater flows, and Miller Creek. Key unresolved concerns include the reliability of the proposed underdrain system, incomplete baseline data, and the lack of independent construction oversight.

A February 2001 technical review letter from Northwest Hydraulic Consultants, submitted on behalf of the Airport Communities Coalition, raises concerns about the stormwater management plan for Seattle-Tacoma International Airport's proposed third runway expansion. The letter identifies deficiencies in hydrology and hydraulics analyses, inconsistencies in stormwater detention standards, and the lack of a clear independent review process for the complex project. Reviewers warn that without stricter oversight and well-defined engineering requirements, the development risks significant adverse impacts to local streams and wetlands, particularly Miller Creek and Des Moines Creek.

In February 2001, Northwest Hydraulic Consultants submitted technical review comments to the U.S. Army Corps of Engineers and Washington State Department of Ecology on behalf of the Airport Communities Coalition, raising concerns about the stormwater management plan for the proposed third runway at Seattle-Tacoma International Airport. The letter identified multiple deficiencies, including dam safety issues, vault structures that violated King County depth requirements, inadequate methods for assessing standing open water durations, and insufficient erosion and sediment control planning. These issues, the consultants warned, could pose risks to both structural safety and safe airport operations if not addressed prior to project approval.

A February 2001 technical review letter from Northwest Hydraulic Consultants, submitted on behalf of the Airport Communities Coalition, raises serious concerns about the stormwater management plans for Seattle-Tacoma International Airport's proposed third runway expansion. The review identifies multiple technical deficiencies in the project's hydrology and drainage designs, warning that they could cause significant adverse impacts to local streams and wetlands, particularly Miller Creek and Des Moines Creek. The letter also criticizes the lack of clearly defined stormwater control standards, absence of independent design review processes, and failure to provide financial guarantees for implementing the stormwater management plan.

Handwritten notes from an Ecology informational meeting with Erik and Ann dated February 14, 2001 (AR 018355-018357). Topics include stormwater plan analysis from Kelly Whiting and John Drybeck (water quality staff), Vasen Farm farmed wetland ratios (1:1 in-basin acreage, 2:1 out-of-basin replacement), enforcement vs. restoration, prior converted designation, Corps of Engineers wetland determinations, 509 overpass,

This document is a professional curriculum vitae for Patrick C. Lucia, a civil engineer and Principal at GeoSyntec Consultants specializing in geotechnical engineering, landslides, and slope stability. It details his education, professional registrations, career history, and representative project experience, including bridge seismic reviews, landslide repairs, and reservoir stability evaluations in California. Note: This document does not appear to contain content related to Sea-Tac Airport noise policy.

A declaration by geologist John J. Strunk of Associated Earth Sciences, Inc. (AESI) submitted to Washington State's Pollution Control Hearings Board describes groundwater contamination studies conducted at Seattle-Tacoma International Airport (Sea-Tac) in connection with the proposed Third Runway project. The studies found that while contamination exists in shallow groundwater zones within the Airport's Aircraft Operations and Maintenance Area (AOMA), it is isolated and located approximately 2,800 feet from the Third Runway site, with water flow predominantly directed away from that area. AESI concluded that subsurface utility lines do not appear to be a significant pathway for contaminant migration toward the Third Runway construction zone.

WAC 173-340-740 from the Model Toxics Control Act (MTCA) Cleanup Regulation, published February 12, 2001, establishing unrestricted land use soil cleanup standards. Covers Method A, Method B (standard and modified), and petroleum mixture cleanup levels including Equations 740-1 through 740-3 for noncarcinogens and carcinogens. Specifies default exposure parameters: soil ingestion rate 200 mg/day, average body

Exhibit AR017360, Part IX Tables from MTCA Cleanup Regulation WAC 173-340-900, dated February 12, 2001. Contains Table 720-1, Method A Cleanup Levels for Ground Water, listing hazardous substances including arsenic, benzene, benzo(a)pyrene, cadmium, chromium, DDT, 1,2-dichloroethane (EDC), ethylbenzene, ethylene dibromide (EDB), lead, lindane, methylene chloride, mercury, MTBE, naphthalenes, PCB mixtures, radium 226, tetrachloroethylene, toluene, trichloroethylene,

This Washington State regulation (WAC 173-340-747) establishes methods for determining safe soil contamination levels that protect groundwater quality at cleanup sites. It outlines several scientific approaches, including three-phase and four-phase partitioning models, leaching tests, and empirical demonstrations, to calculate the maximum allowable concentration of hazardous substances in soil before they risk contaminating groundwater. The regulation requires that soil concentrations not cause groundwater cleanup level exceedances and not result in the buildup of nonaqueous phase liquids in or on groundwater.