TagPollution Control Hearings Board(1532)

Sheldon & Associates letter dated February 15, 2001, responding to public notice comments regarding the Seattle-Tacoma International Airport Masterplan Update Projects Section 404/401 Permits. Addresses movement of water through embankment fill and Mechanically Stabilized Earth (MSE) wall, drainage layer design to prevent excess pore pressures, rock underdrain clogging prevention using Group 1A filter material, shallow

Sheldon & Associates, Inc., retained by the Airport Communities Coalition, reviews environmental documents submitted by the Port of Seattle for the proposed Third Runway project at Seattle-Tacoma International Airport. The letter identifies five key issues with the submitted technical documents, focusing primarily on unsubstantiated conclusions regarding groundwater movement through engineered walls and the project’s ability

Northwest Hydraulic Consultants, retained by the Airport Communities Coalition, submitted technical review comments on the December 2000 versions of the Comprehensive Stormwater Management Plan, Natural Resource Mitigation Plan, and Wetland Functional Assessment for the proposed third runway at Sea-Tac Airport. The letter identifies numerous technical deficiencies in the analyses and preliminary designs, including inconsistent stormwater

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 regarding the December 2000 Comprehensive Stormwater Management Plan and Natural Resource Mitigation Plan for the proposed third runway at Sea-Tac Airport. The letter raises concerns about dam safety

Northwest Hydraulic Consultants, retained by the Airport Communities Coalition, submitted technical review comments on the December 2000 Comprehensive Stormwater Management Plan and related documents for the proposed Third Runway at Sea-Tac Airport. The letter identifies numerous technical deficiencies in stormwater analyses and preliminary designs, including inconsistent stormwater control standards, lack of detailed plans, and absence

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,

Curriculum vitae for Patrick C. Lucia, Ph.D., a civil engineer and Principal at GeoSyntec Consultants specializing in geotechnical engineering, landslides, and slope stability. The document outlines his education, professional registrations, career history spanning over 25 years, academic appointments, and representative project experience including landslide investigations, bridge reviews, and foundation engineering.

Declaration by geologist John J. Strunk of Associated Earth Sciences, Inc. (AESI) submitted to the Pollution Control Hearings Board in support of the Port of Seattle’s opposition to the Airport Communities Coalition’s motion for stay. The declaration details AESI’s groundwater evaluation work at Seattle-Tacoma International Airport, including findings that contamination in the Aircraft Operations and

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,