TagPollution Control Hearings Board(1532)

US Army Corps of Engineers Regulatory Guidance Letter No. 01-1, dated 31 October 2001, providing guidance for the establishment and maintenance of compensatory mitigation projects under Section 404(a) of the Clean Water Act and Section 10 of the Rivers and Harbors Act of 1899. Covers debit/credit assessment methodology, role of preservation, inclusion of upland areas,

Final meeting notes from October 30, 2001 Low Flow Analysis meeting regarding Port Of Seattle’s revisions to the Low Streamflow Analysis and Summer Low Flow Impact Offset Facility Proposal per 401 Permit conditions for Sea-Tac Airport Third Runway. Attendees included Ann Kenny (Dept. of Ecology), Kelly Whiting and David Masters (King County), Lisa Scott (Corps

Draft meeting notes from a Low Flow Analysis meeting held October 30, 2001, related to the 401 Permit Post-Issuance Clarification for Sea-Tac International Airport’s Third Runway. The notes describe modeling errors discovered by Port of Seattle consultants in the low streamflow analysis, including a conversion factor error in embankment fill input to HSPF that resulted

Final meeting notes from an October 30, 2001 meeting convened by the Port of Seattle to discuss errors identified in the low streamflow modeling for the Sea-Tac Airport Third Runway 401 Permit. The meeting covered six specific modeling errors and associated revisions, including a 1/24th conversion factor error in embankment fill input to HSPF, incorrect

Technical notes from Hydrocomp, Inc. (authored by Norm Crawford) describing the linkages between HSPF and Hydrus/Slice models for stormwater and groundwater modeling at Sea-Tac Airport’s new runway and taxiway areas. The document outlines how pervious and impervious land surfaces are modeled, how water moves through fill material and Vashon till, and provides eight recommended steps

Memorandum dated October 30, 2001 from Michael Kenrick of Hart Crowser, Inc. to Jim Thomson of HNTB (project number 4978-06), CC Elizabeth Leavitt of Port Of Seattle, regarding wetland hydrology impacts of the Third Runway Embankment Fill at Sea-Tac Airport. Covers depression wetlands, slope wetlands, and riparian wetlands; references FEIS for the Master Plan Update

Memorandum dated October 30, 2001 from Michael Kenrick of Hart Crowser, Inc. to Jim Thomson of HNTB, CC Elizabeth Leavitt of Port Of Seattle, project number 4978-06. Addresses wetland hydrology impacts of Third Runway Embankment Fill construction at Sea-Tac Airport, covering depression wetlands, slope wetlands, and riparian wetlands. References Miller Creek and Walker Creek baseflow,

Port Of Seattle’s submittal of record references in PCHB case No. 01-160 (Airport Communities Coalition v. Department of Ecology and Port Of Seattle), filed October 29, 2001, opposing ACC’s motion for stay. Lists declarations from James C. Kelley Ph.D., Katie Walter, Erik Stockdale, Paul S. Fendt, Joseph Brascher, Donald Weitkamp Ph.D., Ann Kenny, Edward O’Brien,

Transmittal form dated October 26, 2001 from Jim Kelley, Ph.D. at Parametrix, Inc. (Kirkland, WA) to Muffy Walker, U.S. Army Corps of Engineers (ACOE), Seattle, WA, transmitting responses to ACOE request for additional information regarding the STIA MPU Natural Resource Mitigation project (Project Number 556-2912-001-03). Carbon copy to Elizabeth Leavitt, Port Of Seattle. Attachments include

Email from Kelly Whiting (King County Department of Natural Resources, Water and Land Resources Division) to Ann Kenny and Raymond Hellwig, dated October 25, 2001, summarizing a pre-meeting briefing on revised low flow hydrologic modeling related to Port Of Seattle airport embankment impacts. Discusses Hydrocomp (Norm Crawford) independent review findings, HSPF modeling errors including incorrect