TagPort Of Seattle(2405)

Addendum to the Des Moines Creek Regional Capital Improvement Project Preliminary Design Report, prepared November 1, 1999 by King County Capital Improvement Project Design Team for the Des Moines Creek Basin Committee. Prepared for Tim Heydon (City of Des Moines), Tom Hubbard (Port Of Seattle), David Masters (King County), Don Monaghan (City of SeaTac), and

A October 1999 laboratory analysis report from Aquatic Research Incorporated details water sample testing conducted for Parametrix/Port of Seattle. One water sample collected on October 8-11, 1999 was tested for total suspended solids, petroleum hydrocarbons (diesel and motor oil), and total metals including cadmium, copper, lead, and zinc. Results showed low levels of contaminants, with zinc detected at 0.102 mg/l and copper at 0.0070 mg/l, while diesel and motor oil levels fell below detection limits.

In this October 1999 letter, the Washington State Department of Ecology reviewed a study by the Port of Seattle examining how de-icing chemicals used at Sea-Tac International Airport affect water quality in Miller and Des Moines Creeks. Ecology found significant deficiencies in the study, including incorrect water quality classifications, too few de-icing events sampled, and inadequate monitoring methods, concluding that dissolved oxygen levels in both creeks frequently failed to meet applicable standards. The agency requested that the Port resubmit the study with corrections before a determination could be made about whether de-icing operations were being properly managed to protect local waterways.

Dissolved Oxygen Deicing Study prepared by Cosmopolitan Engineering Group for Port Of Seattle Sea-Tac International Airport (AR042698, August 1999), examining impacts of de-icing agents from airport stormwater runoff on Miller Creek and Des Moines Creek, including BOD5 discharges to NW Ponds and Lake Reba. Accompanied by Washington State Department of Ecology (NWRO) response letter dated

Hart Crowser memorandum from Michael Bailey, Allen Jones, and Doug Lindquist to Jim Thomson (HNTB), dated October 8, 1999, presenting probabilistic seismic hazard analysis (PSHA) results for the Sea-Tac Airport Third Runway project (J-4978-14). Reports peak horizontal acceleration (PHA) values for common design return intervals: 0.16 g (72-year), 0.36 g (475-year), 0.47 g (975-year), and

Hart Crowser subsurface conditions data report (project J-4978.02) prepared for HNTB and Port Of Seattle, dated September 24, 1999, covering Borrow Areas 1, 3, and 4 for the Sea-Tac Airport Third Runway project. Report includes generalized geologic conditions, subsurface soil conditions, hydrogeologic regime, groundwater elevation data, and perched water-bearing zone analysis. Field explorations used dual-wall

A September 20, 1999 internal memorandum from Parametrix, Inc. consultants to Scott Tobiason provides technical review comments on the first draft of the 1999 Annual Stormwater Report for Seattle-Tacoma International Airport (STIA). The memo raises concerns about consistency in water quality comparators, statistical methods for 'trimmed' data sets, and the attribution of reduced sediment levels to construction wheel wash versus other factors. It also flags regulatory issues regarding mixing zones, water quality standards language, and potential NPDES permit compliance implications of identifying pollution sources in the annual report.

Email chain from Raymond Hellwig (Washington State Department of Ecology) to Thomas Fitzsimmons and Bill Alkire, cc’ing Carol Jolly, Ron Langley, Tom Luster, Kevin Fitzpatrick, Dave Garland, Erik Stockdale, Roger Nye, and Paul David Carr, dated September 17, 1999. Discusses Governor’s reported commitment to Sea-Tac legislators (Paterson et al.) that the Section 401 Water Quality

Internal email from Tom Luster (Washington State Department of Ecology) to Raymond Hellwig, Kevin Fitzpatrick, Erik Stockdale, and Paula Ehlers dated September 16, 1999, outlining unresolved stormwater issues in the 401/CZM review of Port Of Seattle’s Sea-Tac Airport Master Plan Expansion. Topics include: definitions of ‘modified Level 1’ and ‘Level 2-type flow control’; role of

Internal email from Tom Luster (Ecology) to Raymond Hellwig, Kevin Fitzpatrick, Erik Stockdale, and Paula Ehlers, dated September 16, 1999, regarding SeaTac Airport 401 certification and compliance with water quality standards under the Clean Water Act. Discusses non-attainment of water quality standards in Des Moines Creek and Miller Creek, antidegradation requirements, Level 2 detention requirements,