TagPollution Control Hearings Board(1532)

This report covers stormwater monitoring at Seattle-Tacoma International Airport for the period July 1, 1998 through June 30, 1999, prepared by the Port of Seattle. It includes sampling results for various analytes including total petroleum hydrocarbons, fecal coliforms, suspended solids, metals, and glycol from deicing operations, along with outfall inspections and whole effluent toxicity testing.

A memo from Roger Nye to Steven M. Alexander detailing the Toxics Cleanup Program’s historical involvement at Sea-Tac Airport, including the management of 15 individual MTCA sites contaminated primarily with jet fuel and gasoline. The memo covers the history of prepaid positions dedicated to airport cleanup oversight, conflicts with the Port of Seattle and airline

A memorandum from Parametrix, Inc. to Paul Fendt analyzing the sensitivity of reasonable potential determinations to ambient water quality contaminant values for the Port of Seattle Storm Water Quality Plan. The memo evaluates copper concentration thresholds in Des Moines Creek against Washington State water quality criteria, examining dilution factors and mixing zones for stormwater discharge

Conceptual Flow Model Boundary Presentation for the Seattle-Tacoma International Airport (STIA) Ground Water Study, prepared by Associated Earth Sciences, Inc. and S.S. Papadopulos and Associates, Inc. for Port Of Seattle. Document AR043187 includes a Project Area Map (Figure 1, dated 08/03/99) showing the data collection boundary, Airport Operations and Maintenance Area (AOMA), wellhead protection delineation

Parametrix, Inc. summary (August 11, 1999) of key wetland findings from the Sea-Tac Runway Fill Hydrologic Studies Report (Pacific Groundwater Group 2000), prepared for the Port Of Seattle Master Plan Update Improvements JARPA review. Covers wetland delineation conservatism, limiting habitat characteristics of Miller Creek, Walker Creek, and Des Moines Creek, salmonid habitat significance, indirect embankment

A memo summarizing three alternative dilution modeling methods for evaluating reasonable potential for exceedence of State water quality standards at proposed Port of Seattle stormwater outfalls. The methods include a static single-event approach based on Ecology’s Permit Writer’s Manual, a dynamic continuous simulation approach using HSPF hydrologic models, and an EPA-funded probabilistic model developed by

A memorandum from Jerald LaVassar of the Washington State Department of Ecology to Tom Luster evaluating construction techniques for a mechanically stabilized earth wall near Miller Creek related to the Third Runway at Sea-Tac International Airport. The memo addresses concerns about adverse foundation conditions that might require disturbing additional wetlands beyond the permitted footprint, concluding

Draft Wetlands Re-Evaluation Document prepared by Port Of Seattle in August 1999 for Seattle-Tacoma International Airport (STIA) Master Plan Update Improvements. Addresses new information on wetlands and aquatic resources affected by the planned new third runway and related improvements, not available during preparation of the 1996 Final Environmental Impact Statement (FEIS) or 1997 Final Supplemental

Report AR042353 prepared by HNTB, Hart Crowser Inc., and Parametrix for Port Of Seattle Aviation Program Management Group, evaluating retaining wall and slope alternatives to reduce impacts to Miller Creek at embankment station 174+00 to 186+00 for the Third Dependent Runway project at Sea-Tac International Airport. Transmitted July 13, 1999 by Barbara Hinkle to Tom

Memorandum dated July 9, 1999 from Reese P. Hastings and Michael J. Bailey, P.E. (Hart Crowser, Inc.) to Barbara Hinkle, Port Of Seattle, regarding Third Runway Project Borrow Areas 1, 3, and 4 and projected impacts to wetlands. Document J-4978-02 quantifies potential wetland resource impacts from excavation of borrow areas providing 7.9 million bank cubic