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HomeMy WebLinkAboutM_ERC_MitMeas_AdvisNotes_ForestTerrace_181019.pdfDEPARTMENT OF COMMUNITY & ECONOMIC DEVELOPMENT Planning Division 1055 South Grady Way, 6th Floor | Renton, WA 98057 | 425-430-7200, ext. 2 www.rentonwa.gov DETERMINATION OF NON-SIGNIFICANCE – MITIGATED (DNS-M) MITIGATION MEASURES AND ADVISORY NOTES PROJECT NUMBER: LUA18-000124, ERC, PP, MOD APPLICANT: Ivana Halvorsen, Barghausen Consulting Engineers, Inc. / ihalvorsen@barghausen.com / 18215 72nd Ave S, Kent, WA 98032 PROJECT NAME: Forest Terrace Preliminary Plat PROJECT DESCRIPTION: Project applicant has requested an ERC reconsideration of DNS-M mitigation measure #6 that would require restoration of Union Ave NE to current City standards from curb to curb along the property's frontage. The applicant is requesting Preliminary Plat approval, Environmental Review (SEPA), Critical Areas Variance, and two (2) modifications to subdivide a 596,570 square foot (13.70 acre) site located at 2611 Union Ave NE (subject property) into 25 single-family residential lots, four (4) open space tracts, and one (1) drainage tract. The subject property is located in the Residential-4 (R-4) zoning classification and Residential Low Density Comprehensive Plan land use designation. Proposed lot sizes would range from 9,038 to 19,584 square feet with an overall density of approximately 2.14 dwellings per net acre. One (1) existing single-family residence on the subject property would be removed. Access to the site would be via a new public residential access street extending from Union Ave NE through the subject property with stubs for future connectivity along the north and western property limits. The applicant would also construct frontage improvements on Union Ave NE along the subject property and the frontage of 2623 Union Ave NE. Stormwater would be conveyed via a system of catch basins and storm pipes throughout the development with flow control provided via two (2) detention tanks and one (1) detention vault located on the northwest portion of the property. A proposed stormfilter would provide water quality treatment. New eight (8) inch sewer and eight (8) inch water mains would be constructed within the subdivision's new public street and connect to the existing sewer and water facilities located in Union Ave NE. The applicant has requested a critical areas variance to remove an existing protected slope on the eastern portion of the subject property to construct a section of the new internal public street with the remaining slope proposed to be replaced with a terraced retaining wall. The applicant has requested a modification to the residential retaining wall height limitation of six (6) feet with proposed rockeries up to 10-feet in height in the southwestern portion of the of the subject property. A second modification is requested for frontage improvements along Union Ave NE for a modified minor arterial standard. A Lot Line Adjustment (LUA18-000125) is also under review for the subject property and the abutting 2623 Union Ave NE that would alter the abutting lot’s property lines to accommodate the proposed subdivision’s new public street alignment and frontage improvements on Union Ave NE. The City’s Critical Areas map identifies potential regulated slopes on the property between 25-40 percent with isolated areas greater than 40-percent. The applicant has proposed to retain 119 of the subject property’s 847 viable trees. The applicant has submitted an arborist report, geotechnical report, transportation impact analysis, and drainage report with the preliminary plat application. PROJECT LOCATION: 2611 and 2623 Union Ave NE / APNs 042305-9142 and 042305-9114 LEAD AGENCY: The City of Renton Department of Community & Economic Development Planning Division MITIGATION MEASURES: 1. Clearing and grading of the subject property shall be limited to May 1 to September 30. 2. The applicant shall comply with the recommendations of the Geotechnical Report, Protected Slope Analysis, and Response to GeoEngineers Secondary Review Comments prepared by Terra Associates Inc. dated July 19, 2017, June 18, 2018, and August 14, 2018, respectively, and any future addenda to such reports. 3. The applicant’s geotechnical engineer shall review the project’s construction plans to verify compliance with the geotechnical report(s). The geotechnical engineer shall submit a sealed letter stating that he/she has reviewed the construction plans and in their opinion the plans and specifications meet the intent of the report(s). 4. The applicant’s geotechnical engineer shall identify those construction activities where observation onsite by a licensed geotechnical engineer should occur. Those identified activities shall be clearly stated on the construction plans to be submitted for review and approval by the Civil Plan Reviewer. 5. The applicant’s geotechnical engineer shall seal and certify all rockeries and retaining walls regardless of height on the construction plans and provide long term maintenance recommendations for future homeowners. 6. If any utilities are constructed east and parallel of the centerline within Union Ave NE along the subject property’s frontage, the applicant shall restore the Union Ave NE roadbed (curb to curb) along the subject property’s frontage to current City Standards prior to final plat recording. 7. If utilities are only constructed west and parallel of the centerline within Union Ave NE along the subject property’s frontage, the applicant shall restore the gaps, if found to not meet City standards, between the trench restorations west and parallel of the centerline to current City standards prior to final plat recording. 8. The applicant shall video the approved haul route prior to the beginning of construction to identify the existing condition of the roadway. Following the completion of plat infrastructure, the applicant shall video the haul route again and identify the post construction condition of the roadway. The applicant shall repair the roadway to a condition equal or better to the condition of the initial video. Repairs to the haul route shall be completed by the applicant and reviewed and approved by the civil plan reviewer prior final plat recording. ADIVISORY NOTES: The following notes are supplemental information provided in conjunction with the administrative land use action. Because these notes are provided as information only, they are not subject to the appeal process for the land use actions.