• City of Duvall

CITY OF DUVALL
SEPA THRESHOLD DETERMINATION
DUV-1 OFF-SITE TEMPORARY FILL AND HAUL ROUTE (SEPA17-001)


Project Name / Description of Proposal: DUV-1 Offsite Temporary Fill and Haul Route (SEPA17-001). The owner/applicant, Charles Hare (on behalf of TOLL WA LP), submitted a permit application on June 30, 2017 (deemed complete on July 7, 2017), seeking environmental review of proposed off-site work associated with the Duvall Urban Village mixed use project. This off-site work includes the construction of approximately 350 feet of permanent new road (Streets L and R) which extend off the Duvall Urban Village project site onto the adjacent Walden project site. A temporary haul route will extend off the temporary terminus of Street L approximately 870 feet east and terminate at two receiving sites where excess fill from the Duvall Urban Village project (totaling approximately 48,530 cubic yards) will stored until later utilization within the Walden project area. Applicant Contact: Charles Hare on behalf of TOLL WA LP, 9720 NE 120th Place, #100, Kirkland, WA 98024, chare@tollbrothers.com, 425-825-5319. Lead Agency: City of Duvall, PO Box 1300, Duvall, WA 98019. The responsible official hereby makes the following determination based upon impacts identified in the environmental checklist and evaluated by staff, the policies set out in the 2015 City of Duvall Comprehensive Plan, and other municipal policies, plans, rules, and regulations designated as a basis for the exercise of substantive authority of the Washington State Environmental Policy Act Rules pursuant to RCW 43.21C. It is hereby determined that this proposal does not have a probable significant adverse impact on the environment. An Environmental Impact Statement (EIS) is not required under RCW 43.21C.031(1). This Mitigated Determination of Non-Significance (MDNS) is issued under WAC 197-11-340; the lead agency will not act on this proposal for at least 14 days from November 15, 2017. Disclaimer: Issuance of this threshold determination does not constitute approval of any permit associated with this proposal. The proposal will be reviewed for compliance with all applicable City of Duvall codes which regulate development activities including, but not limited to, Land Use Codes, Building Codes, Public Works Development Design Standards, Surface Water Design Manual, and Sensitive Area regulations. Description of Impacts: 1. Stormwater Impacts: Stormwater will be generated from new pollution generating impervious surface from the Street R and L improvements. Surface water will be generated from the haul road and soil stockpile improvements. 2. Transportation and Utility Infrastructure Impacts: The project will construct new roadway and utility infrastructure at Streets R and L. 3. Grading Impacts: The proposed project includes large stock piles of soil for use as part future development activities. Temporary stockpiles are proposed at 3:1 slopes. 4. Temporary Erosion Sediment Control Impacts: The project includes stock piles of soil adjacent to sensitive areas and their associated buffers. 5. Plant Animal Impacts: Seventy-Seven Significant Trees that include potential Pileated Woodpecker habitat will be removed. 6. Historic Cultural Preservation Impacts: This project is within an area that has a moderately low risk for containing unknown archaeological resources. Soil disturbance may impact cultural resources. Mitigation Measures: 1. Stormwater Mitigation: Stormwater facilities shall be constructed to provide detention and water quality improvement for Street R and L improvements in accordance with the adopted King County Surface Water Design Manual and Public Works Development Design Standards. The stormwater facilities shall be installed as part of the DUV1 Long Plat (SU-08-001) and be privately owned and maintained by the DUV1 Owners Association. Annual operation and maintenance reports shall be supplied to the City for all private facilities. Surface water generated from the haul road and soil stockpile improvements shall be dispersed into adjacent vegetated areas in accordance with approved Grading and Temporary Erosion and Sediment Control (TESC) plans. 2. Transportation and Utility Infrastructure Mitigation: Roadway, water system, and sewer system improvements shall be installed at Streets R and L to coordinate with planned construction at the DUV1 project to the west and in accordance with the Public Works Development Design Standards, and City-Approved Construction Drawings. 3. Grading Mitigation: Proper site preparation shall be completed prior to stockpile activities. Stockpiles shall be segregated based on soil properties and intended uses and shall be stabilized at a maximum 3:1 slope. No grading shall occur within 10 feet of Sensitive Areas and their associated buffers (area within 10 foot setback must remain in native vegetated state). 4. Temporary Erosion Sediment Control Mitigation: All activities shall be completed in accordance with an approved Temporary Erosion and Sediment Control Plan (TESC) plan including, but not limited to, double silt fencing, plastic sheeting, and or hydroseed with tackifier. A Washington State Department of Ecology Construction Stormwater General Permit is required. 5. Plant and Animal Mitigation: To mitigate plant and animal impacts the Applicant will complete one of the following options to mitigate removal of 77 Significant Trees (16-inch in diameter at chest height): 1) Replace Significant Trees at a 3:1 ratio On-site; 2) Replace Significant Trees at a 3:1 ratio at an off-site location approved by the City; or 3) Bond for the replacement of Significant Trees within the affected area (Walden Project) in the amount of $69,300 (77 trees multiplied by a replacement ration of 3:1 multiplied by $300 per replacement cost per tree). The applicant shall choose an option prior to a construction permit being approved. 6. Historic Cultural Preservation Mitigation: Should archaeological materials (e.g. bones, shell, stone tools, beads, ceramics, old bottles, hearths, etc.) or human remains be observed during project activities, all work in the immediate vicinity shall stop. The State Department of Archaeology and Historic Preservation (360-586-3065), the County/City planning office, the affected Tribe(s) and the county coroner (if applicable) shall be contacted immediately in order to help assess the situation and determine how to preserve the resource(s). Compliance with all applicable laws pertaining to archaeological resources (RCW 27.53, 27.44 and WAC 25-48) is required. Comment Period: Comments regarding this MDNS must be submitted no later than 4:30 pm on Wednesday, November 29, 2017. Appeals shall be filed in accordance with DMC 14.08.060.C. Responsible Official: Lara Thomas, Planning Director PO Box 1300, Duvall, WA 98019, (425) 939-8079. Date Issued: November 15, 2017.
PostedNovember 15, 2017