Planning 2016-10-27 Minutes - Public Hearing - Low Impact Development Regulations / Tukwila Municipal Code Titles 18 and 8.25 Amendments

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Page 2 Public Hearing Minutes October 27, 2016 Greg Villanueva , National Pollutant Discharge Elimination Systems (NPDES) Coordinator, City of Tukwila noted that the PC agenda packet staff report was prepared by Moira Bradshaw on amending the City’s codes for required Low Impact Development (LID). Mr. Villanueva provided background on why the City is required to incorporate LID into its development codes. As the NPDES Coordinator he is responsible for management and implementation of the NPDES Phase II Permit. The Permit authorizes discharge of the surface water bodies of the state, Green River, and Duwamish River. The Permit requires all Washington state cities: 1) To update their codes and make effective LID principles and LID Best Management Practices, which involves amending Title 14 by adopting the 2016 King County Surface Water Design Manual and the 2016 Stormwater Pollution Prevention Manual, which the Public Works Department is currently doing. 2) Amend Title 16 Building and Construction, specifically 16.54 grading, which is currently being done. 3) And before the Commission tonight, Title 18, Zoning and Title 8.25 Vehicle Storage and Parking on Single Family Residential Property. Mr. Villanueva introduced Trista Kobluskie, with Otak Consultants, who the City contracted with to help with implementation of LID into the City’s code. Trista Kobluskie , Stormwater Planner, Otak Consultants gave a presentation on LID and noted the following:  Why the code is being amended to incorporate LID? The municipal stormwater permit requires it. The goal is to make low impact development; the preferred and commonly used approach to site development in the city, which should replace the traditional way of developing sites if possible. This goal is required to be met by December 31, 2016 and implemented at the beginning of 2017 for development proposals.  What is LID? It’s a set of site development principles; it prioritizes retention of native vegetation; reduction of impervious surfaces and managing stormwater close to its source.  Intent? To disturb less land, generate less stormwater, and have a smaller impact on receiving waters.  Technique Examples – parking area reduction; dedicating less land to automobile use; limiting development coverage or impervious surface coverage.  Some techniques to manage stormwater close to its source – bioretention, known as rain gardens; or permeable pavement  The goal of LID is to create an urban landscape that still functions with a natural hydrologic process. The Process used to get where we are today:  The Department of Ecology produced a guideline book, which the City followed.  Involvement and resources - Department of Community Development, Public Works, the Fire Marshal, Public Safety, City Attorney, and ordinances to determine what is appropriate for Tukwila.  Ecology requires participation from officials and community stakeholders because the scope of the changes is potentially large.  The following code titles were reviewed – 8, 14, 16, 17, and 18 which is the purpose of the public hearing. Ms. Kobluskie also provided a summary of her findings during review, such as Comp Plan goal 4.13, promotion of tree retention through the City, which she said was the most sought after goal of LID.  There have been several public outreach efforts throughout this process. A summary of proposed amendments was provided. It was noted that no changes are currently being proposed for the tree regulations as they are subject to amendments in a separate process to follow.