Loading...
HomeMy WebLinkAboutPN_Project_Narrative_250414_v1Project Narrative – SEPA Project Name: 116th Ave SE Sidewalk Size: 2.57 Acres Location: This project’s location is in Renton Washington on 116th Avenue SE between SE 160th Street and SE 162nd Street. This project is in Sections 20, 21, 28, and 29, Township 23 North, and Range 5 East, west meridian. Land Use Permits Required: • Civil Construction Permit, City of Renton • Stormwater Permit, City of Renton Zoning Designation of Site and Adjacent Properties: Site is City of Renton right-of-way with adjacent properties zoned as Residential 6 du/ac (R6) and Residential 8 du/ac (R8). Current Use of Site and Any Existing Improvements: The 116th Ave SE roadway is a minor arterial for the City of Renton, running in the north-south direction, bordered by several residential homes and two churches on the west, and cement concrete sidewalk adjacent to the elementary school on the east. Within 116th Ave SE Right of Way (ROW) there is an existing stormwater conveyance system that is comprised of a mix of open channels and pipe conveyance with drainage structures. During two separate site visits, stormwater was observed fiowing off the roadway and into the conveyance ditches without fiooding. There was observable water in each trench with no visible indication of failure. For site photos of existing conditions refer to the 116th Avenue SE Sidewalk Project Drainage Design Report. The site is composed of two Threshold Discharge Areas (TDA). TDA 1 includes the western half of 116th Ave SE from SE 160th Street (west of 116th) to SE 160th Street (east of 116th). Stormwater runoff from TDA 1 fiows to the north and is collected by a single catch basin, then conveyed through the City’s underground conveyance system to the east. TDA 2 includes the western half of 116th Ave SE from SE 162nd St and SE 160th Street and is sloped to the south. Stormwater runoff from TDA 2 fiows to the south and is collected by a series of drainage ditches and a catch basin, then conveyed through the City’s underground conveyance system, which passes through the Family First Center. On the Family First Site (parcel no. 2823059133) there is a fiow splitter that conveys a pre-designed volume through the on-site treatment and detention system. Both the remaining water and the overfiow from the detention system combine back into one conveyance network and continue to the east, ultimately discharging into a depression at Cascade Park located approximately 2,500 feet to the east. A TDA map is included with the 116th Avenue SE Sidewalk Project Drainage Design Report Special Site Features: None Statement Addressing Soil type and Drainage Conditions: Type of material at site: Soils on the site consist of Alderwood gravelly sandy loam and Arents (Alderwood material). Proposed Use of the Site and Scope of the Proposed Development: The City of Renton proposes to construct a new sidewalk on the west side of 116th Ave SE between SE 160th Street and SE 162nd Street. Improvements would include: • Construction of a sidewalk on the west side of 116th Ave SE between SE 160th Street and SE 162nd Street. • Construction new curb ramps on the northwest corner of 116th Ave SE & SE 162nd St and the southwest corner of 116th Ave SE & SE 160th St. • Addition of Rectangular Rapid Flashing Beacons (RRFB) at the existing marked crosswalk at 116th Ave SE & SE 162nd St and the proposed midblock crossing located approximately 40- feet from the southern intersection of 116th Ave SE & SE 160th St. • Replacement of existing stormwater ditch by the installation of a new stormwater system and regrading the west side of the roadway to manage runoff and connection to existing stormwater system. Plat Information: N/A. Access: Access to site can be achieved from Puget Dr SE or SE 168th St, which are the nearest arterials. Proposed Off-Site Improvements: N/A Total Estimated Construction Cost/Estimated Fair Market value of Proposed Project: Total Estimated Construction Cost: $1,200,000.00 Estimated Fair Mark Value of Proposed Project: N/A Estimated Quantities and Type of Materials Involved in Fill or Excavation: Some areas under the proposed sidewalk and at the back of the sidewalk would need to be fllled with crushed surfacing base course to meet the proposed grade. Topsoil Type A will be used for flll material at the back of the sidewalk in existing vegetative areas. The flll material would come from WSDOT approved pits or other pits that meet the speciflcation requirements. The total cut would be 720 cubic yards, and the total flll would be 130 cubic yards. Number, Type and Size of Any Trees to be Removed: No trees are being removed as a part of this project. Explanation of Any Land to be Dedicated to the City: None. Any Proposed Job Shacks, Sales Trailers, and/or model Homes: N/A. Any Proposed Modifications Being Requested: None. Is Project Within 100 ft of a Stream or Wetland: No. Is Project within 200 ft of Black River, Cedar River Springbrook Creek, May Creek and Lake Washington: No.