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Home My WebLink AboutSWP272952(7) Draft Design Report R" ANT { Duvall Avenue NE/ Coal Creek Parkway SE Reconstruction Project Volume 1 of 3 - Report ' Submitted to City of Renton Renton, Washington Submitted by BERGER/ABAM ' ENGI NEERS I N C. i Job No. FAPWT-04-032 10 September 2004 DRAFT DESIGN REPORT Duvall Avenue NE Widening/ Coal Creek Parkway SE Reconstruction Project 9 Volume 1 of 3 y Submitted to {` City of Renton Renton,Washington ' September 2004 Submitted by BERGER/ABAM Engineers Inc. 33301 Ninth Avenue South, Suite 300 Federal Way,Washington 98003-2600 1 Job No. FAPWT-04-032 DUVALL AVENUE NE WIDENING/ COAL CREEK PARKWAY RECONSTRUCTION TABLE OF CONTENTS ' SECTION PAGE EXECUTIVE SUMMARY............................................................................... .................... iv ' SECTION 1-INTRODUCTION................................................. ......... ...................................... 1-1 ProjectLocation.............................................................. ......... ......... ........................ 1-1 Community Collaboration and Vision............. .... .... .... .... ........ 1-1 ProjectDescription.............................................. ..... .. ......... 1-3 ProjectPurpose.................................................... ........................................................ 1-3 ProposedImprovements................................................................................................ 1-3 StudyDescription...................................... ......... ........................... ... 1-3 SECTION 2-EXISTING INFORMATION AND CONDITIONS........................................... 2-1 r Administrative/Roadway Conditions......................... ................................... 2-1 Regional Roadway Network. ..................... ......... ..................................... 2-3 ExistingLand Use....................... ......................... .... .......................... 2-3 ' Topography........................... ...... ................................. .............................. 2-3 Geotechnical Considerations.... ....... .................. ................................... 2-3 Hydrologyand Drainage.............. ........ ........................................ 2-4 SECTION 3-ROADWAY IMPROVEMENTS..... ......... ........ .............................................. 3-1 Design Standards and Criteria... ...... ..................................................................... 3-1 ' Deviations for-Intersection of Duvall Avenue NE and Northeast Sunset Blvd 3-4 Deviations for Duvall Avenue NE/Coal Creek Parkway SE................................... 3-4 ' Roadway Geometry .. ..................................................................... 3-5 Pavement........................................... ... 3-5 Embankments and Retaining Walls............................................................................. 3-6 Intersectionsand Access-, ........................................................................................... 3-6 ' Geometrics...... ......... ..................................................................................... 3-7 DrivewayApproaches ...... ........................................................................................ 3-7 Pedestrian and Bicycle Facilities................................................................................. 3-7 Landscapingand Irrigation........................................................................................... 3-8 Illumination....................................................................................................................... 3-8 Signalizati on...................................................................................................................... 3-8 Maintenance of Traffic During Construction............................................................ 3-8 StormwaterManagement............................................................................................... 3-8 SECTION 4-ROW/EASEMENTS............................................................................................... 4-1 ' Existing Conditions......................................................................................................... 4-1 ProposedROW.................................................................................................................. 4-1 SECTION 5-UTILITIES.............................................................................................................. 5-1 Utilities ............................................................................................................................... 5-1 Draft Design Report Duvall Avenue NE Widening/Coal Creek Parkway Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington ii September 2004 SECTION 6-ENVIRONMENTAL CONSIDERATIONS AND PERMITS........................... 6-1 Introduction....................................................................................................................... 6-1 Topography........................................................................................................................ 6-1 Geology/Soils..................................................................................................................... 6-1 WaterResources...............................................................................................................' 6-1 Vegetation...................................................................................... .... .................. 6-1 Wildlife.......................... 6-2 Cultural........................................................................................... ..... ...................... 6-2 ' Land Use.............................................................................. -..: ............................. 6-3 Environmental Site Assessment. 6-3 Wetlands............................................................................. .. .................... 6-4 Floodplain............................................................... ..... .... .................. 6-5 WaterQuality......................................................... . 6-5 AirQuality............................................................. ..... ...... .. 6-5 Noise.............................................................. .. . ..... ........... 6-5 Environmental Review and Permits..... - •.•.- .•....................... .•. 6-6 Impacts... ....... .. ..... .... 6-8 NaturalResources........................... .............. .... ......... .......: ................................... 6-15 Summary of Project Impacts.............................. .................................................... 6-15 SECTION 7-IMPLEMENTATION AND FUNDING... ........ .............................................. 7-1 ' Recommended Plan............ .......................................... ....... .............. 7-1 Preliminary Project Costs.............................................................................................. 7-1 Preliminary Cost Allocations...................... ................................................................. 7-1 Funding............................................................................................................................... 7-1 SECTION8-BIBLIOGRAPHY................................................................................................... 8-1 Plansand Reports............................................................................................................ 8-1 DesignStandards............................................................................................................. 8-1 LIST OF FIGURES Figure1-1 Vicinity Map.. ...................................................................................................... 1-2 1-5 Figure1-2 Project Schedule..... ........................................................................................ Figure1-3 Cost Estimates......... ........................................................................................... 1-6 Figure2-1 Drainage Basins................................................................................................... 2-6 Figure 3-1 Typical Cross Section in the City of Renton................................................. 3-2 Figure 3-2 Typical Cross Section in King County........................................................... 3-3 LIST OF TABLES; Table 2-1 Existing Roadway Functional Classifications and Posted Speeds......... 2-1 Table3-1 Summary of New and Replaced Surfaces...................................................... 3-9 Table3-2 Summary of Project Surface Areas................................................................. 3-9 Table 3-3 Summary of Discharge Rates. 3-10 Table 3-4 Water Quality (WQ)and Flow Control........................................................... 3-11 Table 4-1 Summary of Existing ROW................................................................................ 4-1 Table 5-1 Utility Conflicts................ 5-3 Table 6-1 Wetlands in the Duvall Avenue SE Project Area......................................... 6-4 Table7-1 Summary of Preliminary Cost Allocations................................................... 7-1 Draft Design Report Duvall Avenue NE Widening/Coal Creek Parkway Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington iii September 2004 LIST OF APPENDIIMS Appendix A Preliminary Geotechnical Engineering Services Report Appendix B Design Criteria Appendix C Preliminary Hydraulics Calculations Appendix D Environmental Site Assessment Appendix E Noise Report Appendix F Preliminary Cost Estimate i Draft Design Report Duvall Avenue NE Widening/Coal Creek Parkway Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington iv September 2004 +I EXECUTIVE SUMMARY Background and Project Description The primary goal of the Duvall Avenue NE/Coal Creek Parkway SE reconstruction project is to improve an eight-tenths of a mile roadway section of Duvall Avenue NE/Coal Creek Parkway SE from Northeast Sunset Blvd. [State Route 900 (SR 900)] in the City of Renton to Southeast 95th Way in the City of Newcastle. The improvements are planned to reduce congestion and improve safety along Duvall Avenue NE. The roadway within the project limits will be widened and will provide bike lanes, curb and gutter, and sidewalks along both sides of the roadway, in addition to increasing the number of traffic lanes. The intersection of Duvall Avenue NE and Northeast Sunset Blvd. (SR 900) will be widened and reconfigured to improve traffic flow and safety. The existing roadway is paved with asphalt concrete and has both paved and gravel shoulders. Along the southern portion of the roadway, there are several stretches of curb and gutter and sidewalks with an enclosed drainage system. Variable depth drainage ditches exist along the northern portion of the project, which does not have sidewalks. A traffic signal is located at the intersection of Duvall Avenue NE/Northeast Sunset Blvd. (SR 900).,All other intersections in the project are stop-sign controlled. A flashing pedestrian signal and crosswalk are located at NE 21st Street. Currently, the roadway is a two-lane roadway with limited dedicated turn lanes. The current posted speed for the roadway is 35 mph and the roadway is classified as a principal arterial. The existing land uses along the project are characterized by residential and commercial businesses. Recent development in the area has led to increase in traffic, which is beyond the current capacity of the roadway. The corridor has developed into a commuter and freight traffic route between Renton and Bellevue, and additionally acts as an alternate route to Interstate 405 (I-405) during peak hours. The widening of Duvall Avenue NE will ease traffic congestion, while increasing safety, along this corridor. The project will be divided into three segments: the Duvall Avenue NE/Northeast Sunset Blvd. (SR 900) intersection, the segment of roadway in the City of Renton, and the segment of roadway in King County. The City of Renton segment will contain the portion of Duvall Avenue NE from Northeast Sunset Blvd. (SR 900)to the Renton City Limits between Northeast 23rd Street and Northeast 24th Street. The King County segment will contain the portion of Duvall Avenue NE (called Coal Creek Parkway SE with in the County)from the Renton City Limits to Southeast 95th Way at the Newcastle city limits. Reconstruction of the entire corridor involves the City of Renton, Washington State Department of Transportation (WSDOT), King County, and the City of Newcastle. The City of Renton is the lead agency for the City of Renton and King County segments. Summary of Proposed Improvements The proposed improvements of the intersection will consist of a reconfiguration of the traffic signal at the intersection, adding:a second eastbound left-turn lane from Northeast Sunset Blvd. onto Duvall Avenue NE, and adding a southbound right-turn lane from Duvall Avenue NE onto Northeast Sunset Blvd. All curbs will be reconstructed to meet current curb radius design standards. Along Duvall Avenue NE, the proposed improvements will consist of widening the road to provide four travel lanes, a center two-way left-turn lane with turn pockets at intersections,bicycle lanes, curb and gutter, and sidewalks, as well as including drainage improvements, landscaping, and illumination. Approximately midway along the King County portion of the roadway, the center turn lane will transition to an extruded curb where no driveways or side streets are present. Environmental mitigations for wetlands and noise will be included, as necessary, as a part of the overall project construction. Draft Design Report Duvall Avenue NE Widening/Coal Creek Parkway Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington v September 2004 Summary of Project Impacts Right-of--Way (ROW) The existing ROW widths vary along Duvall Avenue NE from 60 to 120 feet. The proposed ROW along the project varies between 82 and 119.50 feet, dependant on the location of current ROW and cut/fill slopes required. The proposed ROW, as shown in the plans, attempts to use as much of the existing ROW along Duvall Avenue NE as possible. No additional ROW will be required for the intersection reconstruction. Along the City of Renton portion of the roadway,the ROW acquisition will be balanced between the east and west sides of the roadway. ROW required along the King County segment of the roadway will be reduced by the use of retaining walls on both sides of the roadway. At this time, it is estimated that approximately 1.4 acres are required for new roadway ROW. An additional 1.4 acres will be required for detention ponds;0.74 acre for Pond B1 and 0.66 r acre for Pond D1. Temporary construction permits will also be required to reconstruct private driveway accesses. t z Utilities �`111i F�' Impacts to existing utilities are anticipated due to construction. Impacted utilities include water, ' storm drain, sewer, overhead electrical power with telephone and television, underground power, fiber optic, and gas. Coordination with utility companies may be necessary for relocating impacted utilities before and during construction. Overhead power lines will be undergrounded according to the Puget Sound Energy franchise agreement in the City of Renton section of project. Potential impacts due to the proposed roadway are summarized in Section 5. Environment Significant or adverse impacts to"the environment-are not anticipated as a result of the project. Environmental considerations included wetlands,noise, biological resources, and water quality. Results of these investigations will be incorporated into the SEPA process and will be available to the public for review and comment. The wetland investigation"and delineation-report,concluded that the wetlands within the project area were not jurisdictional wetlands""Mitigation fbr jurisdictional wetlands is not anticipated;however, jurisdictional determination is pending review by the U.S.Army Corps of Engineers (USACE). The noise report concluded that noise impacts are due to the sound level criterion being met or exceeded, and none are the result of a"substantial increase"over the existing condition. Abatement measures were fully evaluated in accordance with the Federal Highway Administration(FHWA) and WSDOT noise abatement policy, and it was determined that none of the abatement options were reasonable and feasible. A biological resource report will be required to evaluate the potential effects of the project on proposed, candidate,listed species, and potential wildlife and fauna within the project area as required by SEPA-. This report will summarize potential impacts to species and fauna and will make recommendations to minimize impacts by avoidance, mitigation, or minimization measures if necessary. Water quality impacts during and post-construction are expected to be minor. Water quality treatment facilities will be designed, operated, and maintained in accordance with the stormwater design standards specked by the Washington State Department of Ecology (DOE) Stormwater Management Manual for Western Washington. Draft Design Report Duvall Avenue NE Widening/Coal Creek Parkway Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington vi September 2004 r Traffic During Construction ' The proposed reconstruction of the intersection of Duvall Avenue NE and Northeast Sunset Blvd. (SR 900)will require construction on portions of all legs of the intersection to be phased to maintain traffic, as well as access during construction of the project. With the revisions proposed to the Northeast Sunset Blvd. and Duvall Avenue NE/Coal Creek Parkway SE intersections, both horizontally and vertically, existing traffic will need to be accommodated by phased construction of the facilities to maintain two lanes of traffic and existing accesses. Access and Access Revisions rAccess along Duvall Avenue NE will maintain the existing intersections at all existing side streets and private roads/shared driveways. All driveways will need to be relocated to the proposed back of sidewalk due to the widening of the roadway. A limited number of driveways will need to be relocated to side streets or to different locations along the roadway, due to conflicts with intersections and sight distance concerns. Several parcels have circular driveways which will be changed to single entrance driveways. Project Implementation and Cost Funding for design and construction will come from a variety of public sources, including federal grants. At this time, the City of Renton has acquired funding for the project. Intersection reconstruction will occur first, beginning in spring 2005. Both segments of the roadway reconstruction project will be constructed concurrently, and will involve phasing beginning in late 2005. The project is estimated to cost $11.44 million, including about $2.98 million in ROW acquisition costs and $1.90 million in engineering,permitting, and administration costs. 1 r r r Draft Design Report Duvall Avenue NE Widening/Coal Creek Parkway Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington vii September 2004 SECTION 1—INTRODUCTION Project Background Recent growth and development in the City of Renton along the Duvall Avenue NE/Coal Creek Parkway SE project corridor has led to an increase in traffic, and with it increased congestion and accidents. The intersection of Duvall Avenue NE and Northeast Sunset Blvd. (SR 900)was selected as a Hazard Elimination Safety (HES)project in 2002. The HES program is designed to fund safety improvement projects to eliminate or reduce serious accidents by correcting hazardous elements along roadways. The high occurrence of accidents and the increased left-turn volumes onto Duvall Avenue NE from Northeast Sunset Blvd. (SR 900), along with the planned improvements to Duvall Avenue NE and Coal Creek Parkway SE,prompted this selection. The grant associated with the HES project selection will provide federal funding for the engineering and construction of the intersection reconstruction. The Growth Management Act GMA was passed in 1990 and strengthened in 1991 by the g ( ) P g Washington State Legislature. The purpose of the act is to address the adverse effects of uncoordinated and unplanned growth in the state. In order to plan more effectively for economic and population growth, cities and counties are expected to work together to develop an overall vision. In response to the GMA, King County adopted the King County Countywide Planning Policies (KCCPP) in 1994. These policies address growth management problems in King County and the cities within King County, including transportation planning. A goal of these policies is to promote the mobility of people and goods by a multimodal transportation system. The proposed improvements along Duvall Avenue NE/Coal Creek Parkway SE, such as sidewalks and bicycle lanes, promote this ideal along with increasing safety and mobility along the corridor. An environmental impact statement (EIS) for a portion of roadway adjacent to the northern boundary of the project (Environmental Impact Statement for Improvements to Coal Creek Parkway SE, Renton City Limits to SE 72nd Street) was completed in September 1995. This study examined the existing roadway system and alternatives to alleviate congestion and increase safety while minimizing negative impacts to the environment. The findings of this study also apply to the Duvall Avenue NE corridor addressed in this project. Recommendations made in the EIS support design decisions in the current project. Project Location The Duvall Avenue NE/Coal'Creek Parkway SE reconstruction project is located along Duvall Avenue NE/Coal Creek Parkway SE in the City of Renton and unincorporated King County, Washington. The widening will occur on the portion of roadway north of Sunset Blvd. (SR 900) and south of Southeast 95th Way (see vicinity map on Figure 1-1). Community Collaboration and Vision Community input on the Duvall Avenue NE/Coal Creek Parkway SE reconstruction project has been solicited through public open houses and community newsletters. Community involvement will continue throughout the development of the project. Draft Design Report ' Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 1-1 September 2004 AT ANGELES �EVERETT �'_$EATTLE 'RENTON _ - C M1 �N �TACOMA � ABERDEEN- -• OLY41A ► 1 SE M°y t/olley Rcl i S� 4y Creek 1 �h 1 �4` 1 0O 1 1 / w C ' 1 Z NE 25th PI NE 26th Ct 1 a� c 41 P ► a NE 25th Ct ► SE 100th St 1 NE 24th St N)24thSt4 ► 1 1 NE 23rd St ' / NE 22nd LU NE 22nd PI ► Z 1 a Q) w NE 21 st S1 ► Q Q D NE 21st PI N a Q 1 NE 20th St � o NE 19th St I 1 Q N W 1 NE 19th St E Z 1 m` c tE 18th St UJ 1 � Z ► WhitmanP NF18f Qlei 18th PI Q ► 1 h Cl/ a Q � ► � 1 w NE 17th St SE 107th PI U 1 �Se;Q g�v d '/ 0 'N I 11"k Duvall Ave NE/Coal Creek Parkway SE Figure • BERCERIABAM Reconstruction Project 9 ��NTo� "`, Vicinity Map 1-1 Project Description The proposed improvements at the intersection of Northeast Sunset Blvd. (SR 900) and Duvall Avenue NE will include dedicated left- and right-turn lanes for traffic traveling south on Duvall Avenue NE, as well as four through lanes, bicycle lanes, curb and gutter, and sidewalks. Northeast Sunset Blvd. (SR 900)will be widened west of the intersection to provide two left-turn lanes. The remaining legs of the intersection will also be widened but no traffic lanes will be added. In addition, signal reconstruction will be provided. Along Duvall Avenue NE/Coal Creek Parkway SE, the proposed improvements will consist of four travel lanes, a center two-way left-turn lane with turn pockets at intersections, bicycle lanes, curb and gutter, sidewalks, drainage improvements, landscaping, and illumination. About midway along the King County portion of the roadway, the center turn lane will transition to an extruded curb where no driveways or side streets exist. Project Purpose The purpose of the reconstruction project is to provide a safer, more efficient roadway to accommodate increases in traffic volumes due to population growth and associated development. The roadway is at capacity and does not meet City of Renton or King County design standards. Currently, sight distance at existing driveways and side streets is a concern, curves are too sharp for the posted speed, and sidewalks are absent on a majority of the roadway. Increases in volumes at the intersection have led to increases in accidents. Proposed improvements would improve traffic flow and circulation, help relieve peak-hour traffic congestion, increase safety, and provide improved pedestrian and bicycle access along Duvall Avenue NE/Coal Creek Parkway SE. Proposed Improvements At the intersection of Duvall Avenue NE and Northeast Sunset Blvd. (SR 900), the proposed improvements would widen the roadway in all four directions and increase curb radii. Changes to channelization include adding a second eastbound left-turn lane from Northeast Sunset Blvd. onto ' Duvall Avenue NE and a southbound right-turn pocket from Duvall Avenue NE onto Northeast Sunset Blvd. Reconfiguration of the traffic signal is also proposed. Proposed improvements to Duvall Avenue NE/Coal Creek Parkway SE would increase the roadway width to 79 feet in most sections. The proposed cross section includes four 11-foot travel lanes, a center 12-foot left-turn lane, two 5-foot bicycle lanes, curb and gutter, and 6-foot sidewalks on both sides of the street. The proposed roadway alignment meets horizontal and vertical curve requirements for a design speed of 35 mph and increases entering sight distance. Improvements will also include stormwater conveyance, and water quality/quantity facilities. Study Description Scope of Work The scope of work for the Duvall Avenue NE/Coal Creek Parkway reconstruction project includes four major phases: (1)predesign, (2)preliminary design and ROW plans, (3) environmental documentation, and (4)final plans. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 1-3 September 2004 Project deliverables for the intersection reconstruction include the following. ■ Preliminary opinion of costs ■ Draft and final design report, including various technical tests, analyses, evaluations and documentation as necessary to support the scope of work ■ Preliminary plan set(approximately 30 percent design level) ■ Final contract documents, including plans, project manual, and engineer's estimate Project deliverables for the roadway reconstruction include the following. ■ Geotechnical report with recommendations ■ Preliminary opinion of costs ■ Draft and final design report, including various technical tests, analyses, evaluations, and documentation as necessary ■ Preliminary plan set (approximately 30 percent design level) ■ Final contract documents, including plans,project manual, and engineer's estimate ■ ROW plans for all ROW required from properties ■ Permit matrix, environmental recommendations technical memorandum, and completed SEPA and NEPA environmental documentation (including flood plain analysis, biological assessment, archeological/cultural resources report, and noise analysis). See Figure 1-2 for project schedule. Study Funding Funding for design,ROW acquisition, and construction will come from a variety of public sources, including federal grants. At this time, the City of Renton has acquired funding for the project and intends to complete project specific SEPA environmental documentation, complete preliminary design to the 30 percent complete stage, and final design of the entire alignment. Funding has also been acquired for construction(see Figure 1-3). Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 1-4 September 2004 j 1 i FALL WINTER SPRING SUMMER FALL WINTER SPRING SUMMER FALL WINTER SPRING SUMMER FALL WINTER 2003 03/04 2004 2004 2004 04/05 2005 2005 2005 05/06 2006 2006 2006 2006 INTERSECTION OF DUVALL AVENUE NE AND NE SUNSET BLVD j I Project Kick-Off Study Alignment/Profile Alternatives Public Meeting Approval from WSDOT Final Design Report Final Construction Plans Award Contract i Construction ROADWAY - DUVALL AVENUE/ COAL CREEK PARKWAY FROM NE SUNSET BLVD TO SE 95TH WAY Project Kick-Off Geotechnical Analysis Environmental Documentation/Permitting Roadway Design Traffic Analysis Public Meeting Storm Drainage Analysis Final Design Report Right-Of-Way Plans&Acquisition ®� Public Meeting Final Construction Plans C Award Contract - Construction Figure Project Schedule 1-2 SE May Valle Y Ra sF Creek 'h �4y w cry NE 25th PI NE 26th Ct Sys King County Road Project o NE 25th Ct F $ 316,000 Project Engineering SE 100th St $ 1,591,303 Right-of-Way NE 24th St NE 24th St $ 3,468,202 Construction MKOLY $ 438,000 Construction Admin. NE 23rd St ;,$ enton Road Project $ 928,000 Project Engineering NE 22nd LU NE 22nd PI $ 1 ,384,756 Right-of-Way Z $ 3,094,253 Construction o a� NE 21 st St Q Q z NE 21 st PI $ 214,000 Construction Admin. �o Q) Q' j NE 20th St U o NE 19th St Q Nd NE 19th St E Z 4) CO C E th St > z W hitman`�- NF IBfh C Q E 18th PI a� f > w NE 17th St SE 107th PI u= a et pid Q NE Sins 0 . - 0 Figure Cost Estimates 1-3 r SECTION 2—EXISTING INFORMATION AND CONDITIONS Administrative/Roadway Conditions Functional Classifications and Posted Speeds Table 2-1 indicates the functional classifications and posted speed of each of the roadways within the project area. ' Table 2-1. Existing Roadway Functional Classifications and Posted Speeds' Roadway Renton/WSDOT King County Posted Speed Duvall Avenue NE Principal Arterial Principal Arterial 35 mph NE Sunset Blvd. (SR 900) Principal Arterial Principal Arterial 35 mph Geometrics Duvall Avenue NE is a north-south arterial that connects between Southeast 136th Street in the City of Renton and I-405 in the Factoria area of Bellevue. The roadway is identified as Duvall Avenue NE or 138th Avenue SE in the City of Renton and changes to Coal Creek Parkway SE as it enters King County. The existing roadway in the project limits typically consists of two 12-foot lanes, with additional turn lanes at a number of intersections. Along the southern end of the project, curb and gutter and sidewalk are located sporadically. These elements are absent on the northern portion of the project. Northeast Sunset Blvd. (SR 900)is a state roadway that connects between the City of Renton at its eastern terminus and Issaquah at its western terminus. In the vicinity of Duvall Avenue NE, the roadway runs east-west and consists of four travel lanes and one left turn lane. ' Intersections The following is a description of the existing intersections within the project limits. Signalized Locations The Northeast Sunset Blvd. (SR 900)/Duvall Avenue NE intersection is the only signalized intersection along the project. Each leg of the intersection has a dedicated left-turn lane and four through lanes. Traffic flow through the intersection is controlled by an actuated signal. Unsignalized Locations The Duvall Avenue NE/Southeast 107th Place intersection is a three-legged intersection with Southeast 107th Place forming the intersection's west leg. At the intersection, Duvall Avenue NE has a two-way left turn lane. Southeast 107th Place has one approach and one departure lane. The approach from Southeast 107th Place is stop controlled. The Duvall Avenue NE/Southeast 107th Street intersection is a three-legged intersection with Southeast 107th Street forming the intersection's west leg. Each leg of the intersection has one approach and one departure lane. The Southeast 107th Street approach functions as a private driveway approach and has no posted stop control. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 2-1 September 2004 The Duvall Avenue NE/Northeast 18th Place intersection is a three-legged intersection with Northeast 18th Place forming the intersection's east leg. Each leg of the intersection has one approach and one departure lane. The approach from Northeast 18th Place is stop controlled. The Duvall Avenue NE/Northeast 18th Street intersection is a three-legged intersection with Northeast 18th Street forming the intersection's east leg. Each leg of the intersection has one approach and one departure lane. The approach from Northeast 18th Street is stop controlled. The Duvall Avenue NE/Northeast 19th Street intersection is a four-legged intersection. Duvall Avenue NE forms the north and south legs and Northeast 19th Street forms the east and west legs. Northbound Duvall Avenue NE has dedicated left- and right-turn lanes. The right-turn lane tapers off after the intersection. Southbound Duvall Avenue NE has a dedicated left-turn lane. Both legs of Northeast 19th Street have one approach and one departure lane. The eastbound approach from Northeast 19th Street is stop controlled. No stop control is present on the westbound approach from Northeast 19th Street, but there is no indication as to why no stop control is present. The Duvall Avenue NE/Northeast 20th Place intersection is a three-legged intersection with Northeast 20th Street forming the intersection's east leg, At the intersection, Duvall Avenue NE has a two-way left-turn lane. Northeast 20th Place has one lane serving as both an approach and departure lane. The Northeast 20th Place approach functions as a private driveway approach and has no posted stop control. The Duvall Avenue NE/Northeast 21st Street intersection is a three-legged intersection with Northeast 21st Street forming the intersection's.east leg. There is a dedicated left- and right-turn lane from Duvall Avenue NE to Northeast 21st Street,"The right-turn lane tapers off after the intersection: Northeast 21st Street has one approach and one departure lane. There is a crosswalk at this intersection which is indicated by pavement markings, signs, and a flashing amber light across Duvall Avenue NE. The approach from Northeast 21st Street is stop controlled. The Duvall Avenue NE/Northeast 23rd Street intersections are two three-legged intersections with Northeast 23rd Street forming the intersection's east and west legs. The east leg of the intersection is 75 feet south of the west leg of the intersection. Each leg of the intersection has one approach and one departure lane. The westbound Northeast 23rd Street approach functions as a private driveway approach and has no posted stop control. The eastbound Northeast 23rd Street approach is stop controlled. The Duvall Avenue NE/Northeast 24th Street intersection is a three-legged intersection with Northeast 24th Street forming the intersection's west leg. Each leg of the intersection has one approach and one departure lane. The approach from Northeast 24th Street is stop controlled. The Coal Creek Parkway SE/Southeast 100th Street intersection is a three-legged intersection with Northeast 24th Street forming the intersection's east leg. Each leg of the intersection has one approach and one departure lane. The approach from Southeast 100th Street is stop controlled. The Coal Creek Parkway SE/Southeast 95th Way intersection is a three-legged intersection with Southeast 95th Way forming the intersection's west leg. Each leg of the intersection has one approach and one departure lane. The approach from Southeast 95th Way is stop controlled. Traffic Operations A traffic analysis was conducted for the Duvall Avenue NE/Coal Creek Parkway SE reconstruction project in April2004. King County provided traffic forecast volumes for the year 2030 using its traffic model for the traffic analysis. Traffic volumes are expected to increase significantly by the year 2030 due to future development and regional changes in the transportation network. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 2-2 September 2004 During the morning peak hour, peak traffic direction is northbound along Duvall Avenue NE/Coal Creek Parkway SE, with the volume peaking at Southeast May Valley Road. Peak direction reverses during the afternoon peak hour. As roadway capacity increases along the corridor, the ratio between northbound and southbound traffic decreases. Overall traffic on the intersecting side streets along the project is not forecasted to increase significantly. Residential developments in the corridor are fully developed and commercial developments in the vicinity of the intersection of Northeast Sunset Blvd. are not expected to undergo any significant development or redevelopment. In the year 2030, the Duvall Avenue corridor is expected to have over 900 vehicles traveling in the peak direction during peak hours.With this forecasted volume,pedestrians will have difficulty finding a gap in the traffic to cross Duvall Avenue NE/Coal Creek Parkway. This difficulty is increased with widening of the roadway. Regional Roadway Network Principal roadways in the vicinity of the project include Duvall Avenue NE/Coal Creek Parkway SE, Northeast Sunset Blvd. (SR 900), Southeast 95th Way and Southeast May Valley Road. This roadway network serves as a commuter and freight traffic route between the cities of Renton and Bellevue. Additionally, the corridor has developed into an alternative route to 1-405, particularly during peak hours Existing Land Use The existing land use in the project area is residential and commercial businesses. The area is rapidly developing and the use of Duvall Avenue NE/Coal Creek Parkway SE as a commuter route has increased in recent years. ' Topography The proposed project is located in the City of Renton and unincorporated King County in western Washington. The elevation along the route in the City of Renton is relatively flat with an approximate downward slope of less than 1 percent to the north. Along the roadway in the King County segment of the project, the downward slope increases. Slopes range between 3 and 7 percent. Along,the west side of the existing roadway the land rises significantly, while along the east side, the land drops off past the roadway. Total elevation change over the length of the project is approximately 80 feet. May Creek is located approximately 750 feet north of the Southeast 95th Way intersection. Geotechnical Considerations In the City of Renton's portion of the project, existing soil conditions consist of upper layers of medium dense to very dense silty sand with gravel. Soils in the King County segment include fill, colluvium, advanced outwash, and glaciolacustrine deposits. Groundwater levels along the whole corridor are expected to fluctuate as a result of season, precipitation, and other factors. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 2-3 September 2004 Hydrology and Drainage Surfacewater Honey Creek flows northwest on the southeast corner of the SR 900/Duvall Avenue NE intersection. At approximately B STA 173+50, the creek flows into a 72-by 44-inch corrugated metal pipe arch. This pipe arch connects to a series of closed drainage systems that run under the parking lot in the southeast corner of the above-mentioned intersection. This system discharges into Honey Creek at the northwest corner of Union Avenue/SR 900. Honey Creek flows northwest to connect at the north to May Creek. May Creek is located approximately 750 feet north of the Southeast 95th Way Intersection. May Creek flows northwesterly to connect to the Cedar River, which discharges into East Lake Washington. There are no floodplains within the project vicinity. Wetlands There are no jurisdictional wetlands in the project footprint (see Section 6"Wetlands"). J P J Roadway Conveyance System Within the project footprint, stormwater flows both to the north to May Creek and to the south to Honey Creek. The change in flow direction, at the crest of Duvall Avenue, is located at approximately B STA 194+50 (just south of Northeast 21st Street). There are no existing water quality treatment or flow controls for the roadway runoff. The following describes each of the two systems. May Creek In the adjacent subdivisions, on the west side of Duvall Avenue, off-site stormwater is primarily collected through a series of catch basins. The water is then routed in pipes towards Duvall Avenue to be discharged into a ditch on the west side of the roadway. The off-site water combines with roadway runoff in the ditch, conveying the water to a culvert located at approximately B STA 208+00. The corrugated metal culvert transports the water under the roadway to outfall on the eastside of Duvall Avenue in a ravine. On the eastside of Duvall.Avenue, off-site stormwater flows overland to a ditch on the east side of the roadway- Roadway runoff drains to the ditch. Both the on- and off-site water for the east side of Duvall Avenue is conveyed in the ditch to a plugged catch basin on the northeast corner of NE 100th Street at approximately B STA 204+75. It is not known at this time if there are any problems with this segment of the system during large storm events. From B STA 204+75, the roadway runoff along with the east side overland flows, combine in a ditch on the east side of Duvall Ave. This ditch flows over an embankment at approximately B STA 207+75. The stormwater from the ditch combines with the water from the above mentioned culvert to flow downhill to the head of Stream P9. Stream P9 feeds a wetland approximately 400 feet to the northeast. North of B STA 208+00, both on- and off-site overland (west side only)water combine in a ditch on the west side of Duvall Avenue. This ditch flows to an 18-inch reinforced concrete culvert at the corner of Duvall Avenue and Northeast 95th Way. The culvert outfalls on the northwest side of Northeast 95th Way. The stormwater is dispersed through the native vegetation. For the east side, north of B STA 208+00, the off-site water flows down the hill on the east side. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 2-4 September 2004 Honey Creek South of Northeast 21st Street, stormwater from the neighboring subdivisions on both the west and east sides is collected in a series of catch basins. The stormwater is directed to a closed system of catch basins and pipes along Duvall Avenue. There are two main trunk lines running parallel to the curb on each side of Duvall Avenue. Intermittent laterals collect roadside runoff connecting to one of the main trunk lines. At approximately B STA 190+00,the west trunk line crosses under Duvall Avenue to join the east trunk line. South of this location, the on- and off-site water for the east side continues to be collected and conveyed in the same manner. On the west side, south of B STA 190+00, the off-site continues to be collected in a series of catch basins, but is now routed to a ditch. This ditch collects both the west side off-site water and roadway runoff from the west side. At B STA 180+75, the stormwater from the ditch is routed to a catch basin at the northwest corner of Southeast 107th Place. The east trunk line runs west under Duvall Avenue at B STA 179+40 where the above-mentioned catch basin joins this main trunk line. Intermittent laterals collect roadside runoff and stormwater from adjacent parking lots to be conveyed in the main trunk line. The main trunk line on the west side conveys the water south to a storm drain manhole in the parking lot at the southwest corner of the intersection of Duvall Avenue and SR 900 at approximately B STA 173+67. Stormwater on SR 900 is collected by catch basins on both the north and south sides of the roadway. Runoff from eastern leg of SR 900 is conveyed south on the east side of Duvall Avenue to be discharged into Honey Creek. Honey Creek is routed, southwest, under Duvall Avenue through a 77-by 44-inch culvert. The culvert connects to a pipe that in turn connects to the previously mentioned manhole. From this point, the water is conveyed southwest through a series of pipes and manholes. The runoff from the western leg of SR 900 is conveyed south to join with this system. This system is believed to be discharged into a ditch.According to the City of Renton's drainage plans, all of the water from the ditch is conveyed in pipes southwest to two parallel culverts (58 by 36 inches). These two culverts cross northwesterly under SR 900 to discharge into Honey Creek. There are no existing water quality treatment or flow controls for the roadway runoff. Basin Descriptions Eleven existing subbasins have been identified within the project corridor (see Figure 2-1). Eight of these are off-site flows. ■ Subbasin Al (20.82 acres)— The off site runoff from the area northwest of Northeast 24th Street flows eastward down the hill to be collected in a roadside ditch on the west side of Duvall Avenue NE. ■ Subbasin A2'(5.28 acres)—The off-site runoff flows towards Duvall Avenue NE from the area northeast of Southeast 100th Street. This flow is collected in a ditch on the east side of Duvall Avenue NE. The ditch conveys the water over the side of the hill into Stream P9. ■ Subbasin A3(20.27 acres)—The area on the west side of Duvall Avenue NE between the south side of Northeast 23rd Street and Northeast 24th Street. The off-site runoff is conveyed through three storm drain pipes into ditches on the west side of Duvall Avenue NE. These ditches convey the runoff to a culvert located at B STA 208+00, which outfalls to Stream P9 on the east side of Duvall Avenue. ■ Subbasin A4(1.86 acres)—The area on the east side of Duvall Avenue NE between Northeast 21st Street and Northeast 24th Street. The off-site runoff flows overland to a series of ditches on the east side of Duvall Avenue and is conveyed toward May Creek. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 2-5 September 2004 DRAINAGE BASIN MAI s AV' � LEGEND MAY CREEK OFFSITE SUB-BASINS SUB-BASIN MAY CREEK ONSITE Al SUB-BASINS -- (20.82 AC) HONEY CREEK OFFSITE SUB-BASINS HONEY CREEK ONSITE SUB-BASIN SUB-BASINS - (20.27 AC) SUB-BASIN (3.8 AC) SUB-BASIN N KING CO Anacwtes Ave NE (22.80 AC) "Vol LE 0 j Bremerton Ave NE .. SUB-BASIN . 02 �- (4.18 AC i I , m w RENTON l r KING COUNTY May I N Creek w - U Chelan Pt L Y ' r z w s Z +. _a--.._:-�.a_.-mow_-_ a-._....,- __—, .. _. _, _,,, u-V vafiAve _ >: _. �"`�-�— _ ., .-tTuvatrAveNE �:. --- -- ---- _ Y SUB-BASIN B1 } C N r L� (5.70 AC) LU I x ••� b ' _ w Honey Creek z i SUB-BASIW � SUB-BASIN C2 I- - ` 3:D AC (7.69 AC)r' > SUB-BASIN ( ) SUB-BASIN z - A2 SUB-BASIN A4 z (5.28 AC) .22 AC) z Field Ave NE (1 i Y i `��Y �� •, Figure Drainage Basins Map 2-1 ■ Subbasin BI (5.70 acres)—The area within the project footprint that conveys runoff to May Creek. The water is currently collected on both sides of Duvall Avenue in a series of ditches. ■ Subbasin CI (22.80 acres)—The area on the west side of Duvall Avenue NE between Northeast 107th Place and mid-block of Northeast 24th Street/Northeast 21st Street. Off-site runoff flows south to Honey Creek through intermittent ditches and closed storm systems. ■ Subbasin C2(7.69 acres)—The area on the east side of Duvall Avenue NE between Northeast 19th Street and Northeast 107th Place. Off-site runoff is collected in a series of catch basins on the east side of Duvall Avenue NE to be routed to the south into Honey Creek. ■ Subbasin C3(3.58 acres)—The area on the west side of Duvall Avenue NE between Northeast 107th Place and Sunset Blvd. (SR 900). The off-site runoff predominately flows toward both Duvall Avenue NE and Sunset Blvd. to be collected in a_series of catch basins and routed to Honey Creek. ■ Subbasin C4(1.22 acres)—The area on the east side of Duvall Avenue NE between Northeast 107th Place and Sunset Blvd. The off-site runoff predominately flows toward both Duvall Avenue NE and Sunset Blvd.to be collected in a series of catch basins and routed to Honey Creek. ■ Subbasin DI (6.75 acres)—The area within the project footprint that conveys runoff to May Creek. The water is currently collected on both sides of Duvall Avenue and Sunset Blvd.in a series of catch basin to be routed to Honey Creek. ■ Subbasin D2(4.18 acres)—The area within the project footprint that conveys runoff to Honey Creek. In the vicinity of the SR 900 and Duvall Avenue intersection,the water is currently collected on both sides of Duvall Avenue and Sunset Blvd.in a series of catch basins. This water is routed to Honey Creek. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 2-7 September 2004 SECTION 3—ROADWAY IMPROVEMENTS Design Standards and Criteria Design Standards The following are the design standards that are applicable to this project. ■ Renton Municipal Code ■ City of Renton Standard Plans for Road, Bridge, and Municipal Construction ■ WSDOT Design Manual ■ WSDOT Standard Plans ■ King County Road Standards ■ Washington State Department of Ecology (DOE) Stormwater Management Manual for Western Washington (SWMM) ■ King County Surfacewater Design Manual ■ WSDOT Highway Runoff Manual ■ State Environmental Policy Act (RCW 43.21C) The following publications and manuals are applicable to this project when a specific subject is not covered or discussed in the above listed documents. ■ Manual on Uniform Traffic Control Devices ■ AASHTO"Policy on Geometric Design of Highways and Streets" (Green Book) For the design of the Duvall Avenue NE/Northeast Sunset Blvd.. (SR 900) intersection, WSDOT design standards will take precedence over City of Renton and other listed design standards. Design Criteria Intersection of Duvall Avenue NE and Northeast Sunset Blvd. (SR 900 The design criteria for the intersection of Duvall Avenue NE and Northeast Sunset Blvd. (SR 900) will be in accordance with WSDOT Standards. Details for design criteria are shown in Table B-1, included in Appendix in Volume 2. Duvall Avenue NE/Coal Creek Parkway SE The following summarizes the design criteria for Duvall Avenue NE/Coal Creek Parkway SE. Additional details of design criteria and citation of sources are shown in Tables B-2 and B-3, included in Appendix B in Volume 2. Classification: Urban principal arterial Design Speed: 35 mph from Northeast Sunset Blvd. to Northeast 24th Street (Renton) 40 mph from Northeast 24th Street to Southeast 95th Way (King County) ' Traveled Way: 66 feet, face of curb to face of curb (typ) 57 feet(between STA 210+58 and STA 216+33) (A representative section is shown in Figures 3-1 and 3-2) Through Lanes: Four 11-foot through lanes are proposed. (A representative section is shown in Figures 3-1 and 3-2) Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 3-1 September 2004 Typical Cross Section in the Cityof Renton 83' Right-of-Way 2' 66' Roadway 6.5' 5 11' SB 11' SB 12' Left 11' NB 11' NB 5' 6.5' SW & Bike Travel Lane Travel Lane Turn Lane Travel Lane Travel Lane Bike SW & Curb Lane Lane Curb Existing Ground 2:1 Slope Max - 3" Hot Mix Asphalt 3.h" Hqt Mix Asphalt " Crushed Surfacing �- (Class 1/2") ( lass 1 ") Base Coarse r Typical Cross Section in the City of Renton Figure 3-1 Typical Cross Section in KingCounty i (Does Not Depict Superelevation) Right-of-Way Varies r ''57 -66 Roadway with Median r -Wall Proposed 2' 1 5.5' 5' 11' SB 11' SB _3_ _- ' - 12' 11' NB__ 11' NB 5' 6.5' -- p SW & Bike Travel Lane Travel Lane Median Travel Lane Travel Lane Bike SW & Tiebacks Curb Lane - =_r__-__- Lane Curb � --- for Wall Stabilization - , - Proposed Handrail Z% 2% - i!mj Proposed Wall - —� Existing Ground r .5 Hot Mix Asphalt 4 Hot Mix Asphalt 6" Crushed Surfacing (Class 1/2 ) (Class 1 ) Base Coarse r Figure Typical Cross Section in King County 3-2 r - 1 Turn Lanes: One 12-foot two-way left-turn lane with turn pockets at intersections is proposed along the majority of the roadway. Midway along the King County portion of the roadway, a 3-foot median with an extruded curb will replace the center turn lane where there are no driveways or side streets. Roadside: Concrete barrier curbs and gutters with 6-foot sidewalks (5-foot sidewalks on west side of roadway from STA 203+00 north) along each side. Retaining walls or 2:1 cut/fill slopes will be required along the corridor. Grade: 0 percent(City of Renton) to 0.5 percent (King County)minimum; 7.5 percent (City of Renton)to 10 percent (King County)maximum Superelevation: 0.06 ft/ft max Horizontal Curves: 509 feet minimum for 40 mph design speed (6 percent superelevation) 6,000 feet minimum for 40 mph design speed (0 percent superelevation) Sight Distance: Entering Sight Distance: 555 feet for 40 mph design speed Stopping Sight Distance: 325 feet for 40 mph design speed Deviations for Intersection of Duvall Avenue NE and Northeast Sunset Blvd. The following is a summary of the deviations that are required in order to construct the intersection of Duvall Avenue NE and Northeast Sunset Blvd.,as shown in the design report plans included in Volume 3 of this report. For a more detailed description of the applicable design standards/criteria, see Table B-1 in Appendix B in Volume 2. Channelization A deviation from the standard WB 50 design vehicle to a bus design vehicle is required for turning movements at the intersection. The WB-50 cannot negotiate same-lane turns, but can negotiate adjacent lane turns. To fully support WB-50 turning movements, additional ROW would be required from properties located at each'corner of the intersection. The bus design vehicle can negotiate turns within the intersection and the intersection is located on a bus route. Sidewalks New sidewalks within the intersection are the standard width of 6 feet. Sidewalk widths vary as new sidewalks match to existing sidewalks, which are less that 6 feet wide in some locations. Deviations for Duvall Avenue NE/Coal Creek Parkway SE ' The following is a summary of the deviations that are required in order to construct the project as shown in the design report plans included in Volume 3 of this report. For a more detailed description of the applicable design standards/criteria (see Tables B-2 and B-3 in Appendix B, Volume 2). Design Speed A King County variance is required to reduce the 45 mph design speed to 40 mph on Duvall Avenue NE/Coal Creek Parkway SE in the King County segment of roadway for the following reasons. ■ Adjacent sections of the roadway had design speeds of 40 mph or less for the 35 mph posted speed. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 3-4 September 2004 ■ Reduces cost in ROW acquisition, fill materials, and walls by using smaller radii horizontal curves to keep the proposed alignment closer to existing ROW and alignment. Entering Sight Distance A King County variance is required to reduce the entering sight distances for Northeast 241b Street and for the relocated McDowell property driveway for the following reasons. ■ Entering sight distances are greatly improved over existing conditions. Roadway Geometry Horizontal Alignment Values for the proposed horizontal curves on Duvall Avenue NE/Coal Creek Parkway SE meet King County and WSDOT criteria for the proposed design speed and sight distance requirements. The minimum allowable radius for 40 mph design speeds is 6,000 feet with no superelevation and 509 feet with a 6 percent superelevation. There are four horizontal curves on the alignment;two in the Renton segment of the alignment have radii of 6,000 feet with no superelevation, and two in the King County segment of the alignment have radii of 531.50 and 527 feet with a maximum 6 percent superelevation. Vertical Alignment The proposed vertical alignment design parameters for Duvall Avenue NE/Coal Creek Parkway SE meet all design criteria for stopping sight distance and maximum grades, as specified above and in Tables B-2 and B-3 in Appendix B,Volume 2. The vertical profile was established based on the existing ground elevation along the alignment. The proposed profile attempts to minimize cut and ' fill along the corridor and allows for proper storm drainage. The proposed roadway will match into existing side streets. Lane Configuration Reconstruction of the Duvall Avenue NE/Coal Creek Parkway SE corridor will accommodate current traffic volumes, as well as future traffic. A corridor analysis was conducted to determine the lane configuration and intersection geometry required to provide acceptable operating levels of service at the Duvall Avenue NE/Northeast Sunset Blvd. intersection for the design year 2030. Widening Duvall Avenue NE/Coal Creek Parkway SE to a four-lane facility with a two-way left-turn lane will ' provide adequate capacity to meet expected 2030 forecasted demand. A corridor progression assessment was performed using the Synchro 6.0 modeling to determine how the corridor, as well as the individual intersections, would function under expected traffic,future traffic, and signal control. The intersection channelization requirements that resulted from this analysis are described in the "Intersections and Access" subsection below. Pavement Based on preliminary analysis, the following pavement section is used throughout the project limits to provide a 25-year pavement design life. All depths are minimum compacted depths. Draft Design Report ' Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 3-5 September 2004 ' City it o Renton ' ■ Hot Mix Asphalt(Class 1/2-inch) 0.25 foot ■ Hot Mix Asphalt(Class 1-inch) 0.30 foot ' ■ Crushed Rock Base Course 0.50 foot King County ' ■ Hot Mix Asphalt(Class 1/2-inch) 0.30 foot ' ■ Hot Mix Asphalt(Class 1-inch) 0.35 foot ■ Crushed Rock Base Course 0.50 foot ' A payment overlay of 0.33 foot will be placed over the existing pavement at the intersection of Duvall Avenue NE and Northeast Sunset Blvd. A detailed pavement design will be completed following additional geotechnical engineering analyses during final design efforts. See the "Geotechnical Engineering Services Duvall Avenue NE Improvements" geotechnical supplemental report in Appendix A for further details. Retaining Walls Retaining walls are used along the corridor as shown in the typical sections provided in the design ' report plans included in Volume 3. Due to groundwater seepage expected from cuts required along the west side of Coal Creek Parkway SE, soldier pile walls will be constructed. For fill sections, mechanically stabilized earth walls will be used. Cut wall sections under 6 feet in height will be ' supported by a rockery wall. See the"Geotechnical Engineering Services Duvall Avenue NE Improvements" geotechnical supplemental report in Appendix A for further details. ' Intersections and Access Forecast Traffic Volumes ' King County provided 2030 traffic forecast volumes using its traffic model for the analysis. Four future'alternatives were considered for the corridor. These alternatives included a "no-action" alternative, as well as three-lane, four-lane, and five-lane alternatives. Output shows significant traffic volume increases over existing conditions. The morning peak hour numbers reveal that the peak direction is northbound. The traffic volumes build as one travels north ' along the study corridor and peaks at Southeast May Valley Road (outside of the project boundaries). In the afternoon, the general peak direction is southbound. However, in the higher capacity alternatives, the ratio between northbound and southbound volumes decreased. ' The overall traffic on the intersecting side streets is not forecasted to increase significantly. Developments along this corridor are generally built-out. Most of the side streets connect to fully .developed residential areas. Development in this area of Renton and King County is primarily low- density residential development. Some commercial developments are located along Northeast Sunset Blvd. At this time, this corridor is not expected to see any significant development or redevelopment. t Draft Design Report ' Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 3-6 September 2004 Intersection Channelization Separate Synchro models were created with the no-action, three-lane, four-lane, and five-lane improvement alternatives and associated forecasted 2030 volumes to evaluate the level of service and delay for the intersections along the project corridor. As a result of this analysis, intersection channelization requirements for the project were identified and used to prepare the design report plans that are included in Volume 3. The required length of turn pockets were established to provide adequate storage. Synchro analysis calculated 95 percentile ' queue lengths for each movement at all study intersections during the AM and PM peak hour periods. The total pocket lengths may have been modified to better allow turning vehicles to bypass the through-movement queues. ' Conclusions The five-lane roadway section proposed will require improvements at several locations to further ' increase capacity, reduce congestion, and shorten queue lengths. The increase in corridor capacity would attract traffic to Duvall Avenue NE that might otherwise travel on parallel arterials or other less desirable local roads. The addition of a center two-way left-turn lane will also increase safety along the corridor. Geometrics Corner radii for the intersection of Duvall Avenue NE and Northeast Sunset Blvd. (SR 900) are between 35 and 55 feet. The variation in radii is due to the skew angle of the intersection and the constraint of taking no additional ROW. The radii provided are sufficient for the bus design vehicle ' used. Corner radii for local access cross streets are 25 feet. Corner radii for private streets vary between ' 20 and 25 feet. Driveway Approaches The majority of driveways along the corridor are residential driveways. Residential driveway approaches will be in accordance with WSDOT Cement Concrete Driveway Entrance Type 4. Three driveways will need to be relocated. The driveway on Parcel 5169700129 (Glass)will be relocated ' west of the retaining wall,off of Southeast 107th Place. The driveway on Parcel 0323059052 (McDowell) will be relocated north along the alignment to maximize entering sight distance. The driveway on Parcel 0323059287 (City of Renton Park) will be relocated to enter Coal Creek Parkway ' SE across from the proposed Southeast 95th Way. Driveway approaches will be provided as shown on the design report plans (Volume 3). Pedestrian and Bicycle Facilities ' Pedestrian facilities for the project will be 6-foot-wide sidewalks on each side of the roadway. P J Y Crosswalks will be provided along all four legs of the Duvall Avenue NE/Northeast Sunset Blvd. ' intersection and across Duvall Avenue NE between Northeast 21st Street and Northeast 23rd Street. Five-foot-wide bicycle lanes adjacent to curb will be provided along both sides of the roadway. Draft Design Report ' Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 3-7 September 2004 Landscaping and Irrigation No landscaping is currently envisioned for the project, except for hydroseeding areas for restoration outside the limits of the sidewalk construction and restoration of private property. Mitigation for impacted wetlands will be in the form of creation and enhancement as required. No irrigation ' systems will be used. The use of drought-tolerant plants will be employed as required. Illumination Roadway lighting will be provided along Duvall Avenue NE/Coal Creek Parkway SE as specified in Chapter 6, 4-6-060-I, of the Renton Municipal Code, and should be designed and constructed in accordance with the City publication, "Guidelines and Standards for Street Lighting Design of ' Residential and Arterial Streets." Signalization A signal warrant assessment was conducted to evaluate the basis and warrants for the installation of traffic signals within the project limits. The warrant analysis was performed as specified under the "Manual on Uniform Traffic Control Devices." Given the forecasted traffic volumes, it is ' recommended that traffic signals be installed for the Duvall Avenue NE/Coal Creek Parkway SE reconstruction project at the following intersections (see the "Duvall Avenue Corridor Traffic Analysis Report" supplemental report). ■ Northeast Sunset Blvd. (reconstruction of existing signal) ■ Between Northeast 21st Street and Northeast 23rd Street(pedestrian actuated signal) ' ■ Southeast 95th Way (future—intersection is in City of Newcastle jurisdiction but adjacent to project limits) Maintenance of Traffic During Construction ' The proposed reconstruction of the intersection of Duvall Avenue NE and Northeast Sunset Blvd. (SR 900) will require construction on portions of all legs of the intersection to be phased to maintain traffic, as well as access during construction of the project. With the revisions proposed to the Northeast Sunset Blvd. and Duvall Avenue NE/Coal Creek ' Parkway SE intersections, both horizontally and vertically, existing traffic will need to be accommodated by phased construction of the facilities to maintain two lanes of traffic and existing accesses. ' Stormwater Management A stormwater analysis and design has been conducted by BERGER/ABAM in accordance with DOE's ' rxexp irem nts for redevelopment. The project site has over 46 percent existing impervious coverage and will not add 50 per nt or more to the existing impervious surfaces within the project limits such that the minimum requirements No. 1 through No. 10 of the Stormwater Management Manual for ' Western Washington(SMMWW) will apply only to the new and replaced impervious surfaces. The existing"hydrology and drainage" conditions for the project area are described in Section 2. The following is a summary of the stormwater management findings and recommendations of the report. Stormwater will be formally collected in catch basins, eliminating the existing open ditches and culverts under street intersections and driveways. Both detention and treatment facilities will be configured to collect, treat, and detain the runoff from the new and replaced surfaces The areas of the new and replaced surfaces were used to size the detention/water quality facilities (see Table 3-1 for these areas). Draft Design Report ' Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 3-8 September 2004 Table 3-1. Summary of New and Replaced Surfaces Sub-Basin New Impervious Converted Pervious Surfaces Total Surface May Creek(B1) 2.18 acres 1.55 acres 3.73 acres Honey Creek(D1) 2.70 acres 0.53 acre 3.23 acres h existing alignment, a ortion of the existing impervious surfaces will Due to the proposed shift in the e gp g p be converted to landscaping, while on the other hand some of the existing pervious surfaces will be converted to impervious surfaces. The project will add approximately 2.63 net acres of impervious surface area (for this project only)to the site (see Table 3-2 for a net summary of the surface areas of the project). ' Table 3-2. Summary of Project Surface Areas Project Totals Existing Proposed Net increase/decrease) Impervious Area (roadway) 3.91 acres 5.78 acres 1.87 acres (increase) Impervious Area (sidewalk) 0.25 acre 1.01 acres 0.76 acre (increase) Total Impervious Area 4.16 acres 6.79 acres 2.63 acres(increase) Pervious Area 4.77 acres 2.14 acres 2.63 acres (decrease) Total Project Area 8.93 acres 8.93 acres ' May Creek Existing Proposed Net increase/decrease) Impervious Area (roadway) 2.11 acres 3.48 acres 1.37 acres (increase) Impervious Area (sidewalk) 0.03 acre 0.61 acre cre (increase) Total Impervious Area 2.14 acres 4.09 acre .1.95 acres (increase) Pervious Area 3.56 acres 1.61 acres acres (decrease) Total Project Area 5.70 acres 5.70 acres Honey Creek-DI Existing Proposed Net (increase/decrease) Impervious Area(roadway) 1.80 acres 2.30 acres 0.50 acre (increase) Impervious Area(sidewalk) 0.22 acre 0.40 acre 0.18 acre (increase) ' Total Impervious Area 2.02 acres 2.70 acres 0.68 acre (increase) Pervious Area 1.21 acres 0.53 acre 0.68 acre (decrease) Total Project Area 3.23 acres 3.23 acres ' Flow Control The y hydraulic analysis was performed and the proposed facilities were designed using a ' continuous simulation hydraulic model based on the Environmental Protection Agency's Hydraulic Simulation Program-Fortran (HSPF). The continuous simulation hydraulic model, MGSFlood, is in accordance with the guidelines listed in Volume 3 of the SMMWW(see Appendix C in Volume 2 for ' detention calculations). The continuous model was used to determine stormwater detention requirements. Detention ' facilities were sized so that developed discharge rates will match predeveloped forest conditions for the range from 50 percent of the 2-year peak flow up to the 100-year peak flow (see Table 3-3 below for a summary of these discharge rates). Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 3-9 September 2004 ' Table 3-3. Summary of Discharge Rates ' May Creek- City of Renton and King County 2-year PRE 10-year PRE 100-year PRE ' Flows (cfs) .094 0.1843.0 0.343 Precip. (in) 2.1 40 ' 2-year POST 10-year POST- 100-year POST Flows (cfs) 0.682.1 1.094 1.8454.0 Precip. (in) 3.0 In Flow Release Rates ' (cfs) (cfs) 2-year POST 13.07 <1/2 of 2-year PRE 034 10-year POST 22.15 <2-gear PRE 0.111 100-year POST 32.37 <10-year PRE 0.185 ' HoneyCreek-City of Renton 2-year PRE 10-year PRE 100-year PRE Flows (cfs) 0.081 0160 0.297 Precip. (in) 2.14.0 ' 2-year POST 10-year POST 100-year POST ' Flows (cfs) 0.762 1.169 1.866 Precip. 2.1 3.0 4.0 ('m) ' In Flow Release Rates (cfsj (cfs) 2-year POST 0762 <1/2 of 2-year PRE 0.034 ' 10-year POST 1.169 <2-year PRE 0.095 100-year POST 1.866 <10-year PRE 0.137 d Water Quality ' Stormwater treatment facilities for the project were analyzed and designed to meet the minimum` ' standards identified in King County's Surfacewater Design Manual(SWDM). Water quality facilities were sized to treat the new impervious areas containing roadway runoff. Water quality design volumes were determined using the above-mentioned continuous runoff model in accordance with the guidelines listed in Volume 4, Chapter 4 of the SMMWW for the six-month, 24-hour storm ' (see Appendix C in Volume 2 for water quality calculations). By the definition of a high-use site by the SMMWW (Volume V, Section 2.1), the project will not utilize oil control facilities. q Draft Design Report ' Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 3-10 September 2004 Conveyance System ' The project corridor was divided into two drainage areas (see Section 2 for basin areas). The drainage areas were delineated using the base map developed for the project. The delineated ' drainage areas reflect the configuration of the existing drainage patterns and the proposed roadway. The approximate locations of existing outfalls will be maintained to avoid flow diversions from the existing drainage patterns. The proposed conveyance system was analyzed and designed in accordance with the current guidelines listed in the SWDM. The Santa Barbara Urban Hydrograph`'(SBUH) method was used to compute the 25-year, 24-hour storm peak discharge for all pipelines(see Appendix C in Volume 2 for conveyance system calculations). Gutter flow and inlet spacing were determined by using the gutter analysis method described in WSDOT's Hydraulics Manual. Each full pipe capacity was evaluated using Manning's equation. Wet Ponds Combined wetpool/detention ponds were designed for both water quality and detention. Each of the two ponds will consist of two cells separated by a gravel berm. Approximately 35 percent of the water quality volume will be contained in the first cell. The second cell will contain both the detention volume (live storage) and the remaining 65 percent of water quality volume (dead storage). ' The water quality volume was given a safety factor of 1.5. Table 3-4 summarizes the detention volume and water quality volume required for the drainage areas. Table 3-4. Water Quality (WQ) and Flow Control Basin Detention WQ Volume Type of Facility Volume May Creek 86,277 CF 18,393 CF Combined water quality and detention pond Honey Creek 88,150 CF 19,916 CF Combined water quality and detention pond ' The first cell of the ponds shall contain 1 foot of sediment storage. The first cell is proposed to be lined with a low-permeability liner, such as compacted till liner, clay liner, or geomembrane liner. An emergency overflow structure is designed to discharge the 100-year flow for developed condition. An access ramp is provided to the first cell of each pond at a maximum grade of 15 percent for maintenance. A birdcage/multiple orifice restrictor located in the second cell will facilitate the discharge rates mentioned in Section 2"flow control"and will convey the discharge to the applicable discharge location. ' Pond D1 will contain the roadway runoff for Subbasin D1. Pond D1,located at approximately B STA 183+50, will have 2H:1V interior slopes on all four sides of the first and second cells. Pond B1 will contain the roadway runoff for Subbasin B1. Pond B1,located at approximately B STA 217+00,is positioned on a downward slope. A combination of both vertical walls and 2H:1V interior sloped will be used to avoid deep cuts to reach the desired combined volume for detention and water quality. ' Further geotechnical investigation will need to be performed on each of the two parcels that will contain Ponds B1 and D1. This is to determine the soils present and the groundwater elevation. ' Locations of the outfall for Pond B1 are being investigated. There are two options. 1. A direct discharge to May Creek. Additional environmental concerns will need to be investigated. Draft Design Report ' Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 3-11 September 2004 Proposed System for On-Site Runoff ' Computations to size the pipes are included in Appendix C in Volume 2 and depicted in the draft report plans included in Volume 3. Preliminary design of flow control and water quality facilities are ' shown on the design report plans included in Volume 3. Basin DI (from Northeast Sunset Blvd. to Northeast 22nd Place) This drainage area is in the Honey Creek basin. Runoff from the proposed roadway will be collected by catch basins at the gutter on both sides of the roadway. A system of pipes will direct runoff to a flow bypass structure in the vicinity of Pond D1. Flow from existing impervious areas will be diverted through the bypass structure to connect to the existing drainage system. Flow from the new impervious areas and converted pervious areas will be diverted to Pond D1 for water quality treatment and flow control. Discharge from the pond will be conveyed through a closed pipe system to discharge at an existing manhole located along Sunset Blvd. at approximately A STA 169+93 (66' RT). This manhole (discussed in Section 2)eventually discharges into Honey Creek. Basin BI (from Northeast 22nd Place to Southeast 95th Way) This drainage area is in the May Creek Basin. Runoff from the proposed roadway will be collected by catch basins at the gutter on both sides of the roadway. A system of pipes will direct runoff to a flow bypass structure in the vicinity of Pond B1. Flow from existing impervious areas will be diverted through the bypass structure to be discharged in the same location(to be determined) as the discharge from Pond B1 as mentioned above in the section on wet ponds. Flow from the new ' impervious areas and converted pervious areas will be diverted to Pond B1 for water quality treatment and flow control. Discharge from the pond will be conveyed through a closed system of pipes. ' Proposed System for Off-Site Runoff For both subbasins, off-site runoff will be separated from on-site flows. The off-site flows will be conveyed to the existing storm system or will outfall at their current location to maintain the existing hydrology. Basin DI The pipes carrying the off-site flows from the west side of Duvall Avenue will connect to the existing storm system. For approximately 400 feet to the south of B STA 194+50, the east side off-site overland flows will be collected in a series of catch basins and tied into the existing storm system. South of this area, off-site flows are captured in the neighboring subdivisions and connected to the existing system either on Duvall Avenue or Sunset Blvd. Existing drainage patterns will be maintained. Basin BI ' There is an existing culvert on the east side of Duvall Avenue at approximately B STA 208+00. This culvert outfalls to Stream P9, which feeds a wetland approximately 400 feet to the northeast. Currently, off- and on-site water are both conveyed to the culvert through roadside ditches. The ' proposed storm system would separate the on- and off-site stormwater. Only the off-site water will be conveyed to the existing culvert. Separating the on- and off-site flows would decrease the amount of hydrology going through culvert to the Stream P9 by approximately 12 percent. There is a large ' area upstream of Stream P9 that produces overland flows. Further investigation needs to completed to determine the overall effect this will have on the stream. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 3-12 September 2004 The pipes carrying the off-site flows from the west side of Duvall Avenue will connect to a trunk line ' within the ROW. This trunk line will convey the flow to approximately B STA 208+00 (left)where it will connect to the existing culvert. Off-site flows, on the west side, north of B STA 208+00, will be intercepted behind the retaining wall to be discharged on the northwest side of Southeast 95th Way. Off-site flows from the east side of Duvall Avenue flow overland to catch basins located within a drainage easement. A trunk line will transport the captured off-site flows to the existing culvert. Off-site flows, on the east side, north of B STA 208+00, will flow overland to the east. The proposed off-site system is shown in the draft report plans included in Volume 3. Downstream Analysis Runoff from the project site will be collected and detained to'meet the flow control requirement set by DOE. The flow control criteria reduce flow rates for the proposed condition to the rates that are characteristic of the natural conditions. The controlled flow prevents the long-term erosion in the downstream watercourses. Downstream analysis is not needed in this project. ,. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 3-13 September 2004 SECTION 4—ROW/EASEMENTS Existing Conditions The existing ROW width varies through the project improvement area. Along Duvall Avenue NE in the City of Renton, the minimum width is 60 feet and the maximum width is 100 feet. Along Coal Creek Parkway SE in King County, the typical width is 60 feet, with the ROW widening to more than 100 feet near the intersection with Southeast 95th Way. The existing ROW width varies throughout the project site, as summarized in Table 4-1. Table 4-1. Summary of Existing ROW Section of Duvall Avenue NE/Coal Creek Pkwy SE Existing ROW Width (feet) Sta. 173+00 to Sta. 173+46 84 Sta. 173+46 to Sta. 174+76 92 Sta. 174+76 to Sta. 177+96 Varies Sta. 177+96 to Sta. 178+96 100 Sta. 178+96 to Sta. 180+72 Varies Sta. 180+72 to Sta. 182+40 75 Sta. 182+40 to Sta. 185+62 80 Sta. 185+62 to Sta. 187+44 60 Sta. 187+44 to Sta. 188+85 80 Sta. 188+85 to Sta. 190+75 92 Sta. 190+75 to Sta. 192+07 72 Sta. 192+07 to Sta. 193+12 80 Sta. 193+12 to Sta. 195+14 100 Sta. 195+14 to Sta. 195+94 80 Sta. 195+94 to Sta. 196+29 100 Sta. 196+29 to Sta. 198+30 80 Sta. 198+30 to Sta. 199+95 95 Sta. 199+95 to Sta. 204+43 80 Sta. 204+43 to Sta. 212+79 60 Sta. 212+79 to Sta. 214+37 80 Sta.214+37 to End of Project Varies Proposed ROW ROW The ROW needs along the proposed alignment will require acquisitions from over half of the parcels adjacent to Duvall Avenue NE/Coal Creek Parkway SE. The most significant acquisitions will be in the King County portion of the corridor, where the proposed alignment strays from the existing alignment to meet horizontal curve requirements. In addition, it is anticipated that the following parcels will be acquired in their entirety. Parcel 3295400120(Bales) The Bales property consists of approximately 0.65 acre of land located on the southeast corner of the intersection of Duvall Avenue NE and Northeast 18th Place. For the following reasons, it is recommended that this parcel be acquired in its entirety. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 4-1 September 2004 ■ A proposed storm drainage pond is located on the Bales property. This property was chosen for ' the location of the storm drainage pond because of its location along the corridor and because it is vacant. Parcel 0323059116(Brant) The Brant property consists of approximately 0.74 acre of land located east of the Coal Creek Parkway SE/Southeast 95th Way intersection. For the following reasons,it is recommended that this parcel be acquired in its entirety. ■ The proposed alignment will require a ROW acquisition from the property and the current property owner has expressed an interest in being bought out. ■ The City of Renton Parks property driveway, which accesses Parcels 0323059112 and 0323059164, will need to be relocated to meet entering sight distance requirements. The , proposed relocated driveway runs through the Brant property. ■ A proposed storm drainage pond is located on the Brant property. The proposed ROW width varies between 82 and 119.50 feet, as shown on the design report plans located in Volume 3. The total number of parcels affected will be determined during the preparation of the final ROW plans. At this time, it is estimated that a total of approximately 2.8 acres of property, including total take parcels, will be required for this project. Of this amount,it is estimated that approximately 1.4 acres are required for new roadway ROW. The remaining 1.4 acres will'be available for stormwater detention and driveway relocations. In the city of Renton, 1.1 acres of the total ROW is required. The remainder 1.8 acres of ROW is in King County. Easements Permanent Drainage Easements Approximately 0.43 acre of permanent drainage easements will be required for construction of catch basins and storm drainage lines to collect and convey off-site flow. Drainage easements begin along the east side of the roadway at Northeast 19th Street and continue north until approximately B STA 208+00. On the west side of the roadway, drainage easements begin at Northeast 24th Street and continue north until the relocated driveway on the McDowell property. Temporary Slope Easements Slope easements will be,required to match the proposed roadway to the existing land along the ' alignment. A 2:1 side slope will be used unless a flatter slope can be accommodated without requiring additional ROW. The easements will be required along the majority of the corridor and are temporary. Approximately 0.34 acre of temporary slope easements will be required, mostly on the southern end of the corridor. Temporary Construction Easements/Agreements to Reconstruct Driveways Temporary construction permits are required at all locations where driveway approaches are connected to the proposed roadways. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 4-2 September 2004 Assumptions for ROW Cost Calculations The cost of ROW for partial take of parcels has been estimated at$15 per square foot. The cost for total takes of the parcels are estimated based on the assessed value of the land and improvements, plus 20 percent to account for the increase in market rate. The cost for removal of permanent structures within the proposed ROW is included in the estimate under the line item for"the removal of structures and obstructions." Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGERIABAM,FAPWT-04-032 City of Renton,Washington 4-3 September 2004 SECTION 5—UTILITIES ' Utilities Existing Utilities . Known utilities are shown on the design report plans (Volume 3)based on survey data provided by the City of Renton and King County. ' The following utilities are known to have utilities within the limits of this project. Power Puget Sound Energy P.O. Box 90868 Bellevue, WA 98009-0868 Contact: Joe Jainga (425/224-2120, 206/604-5662) Gas ' Puget Sound Energy P.O. Box 90868 Bellevue, WA 98009-0868 Contact: Joe Jainga (425/224-2120, 206/604 5 �y Sewer � City of Renton Renton City Hall—5th Floor . 1055 South Grady Way Renton, WA 98055 Contact: John Hobson(425/430-7279) King County 201 South Jackson Street MS: KSC-TR-0231 Seattle, WA 98104 Contact: Earl Fisher (2061296-6576) Coal Creek Utility District ' 6801— 132nd Place SE Newcastle, WA 98059-1415 Contact: Larry Jones (425/235-9200) Storm Drainage City of Renton Renton City Hall—5th Floor 1055 South Grady Way ' Renton, WA 98055 Contact: Ronald Straka (425/430-7248) Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 5-1 September 2004 1 ' King County 201 South Jackson Street ' MS: KSC-NR-0600 Seattle, WA 98104 Contact: Mark Wilgus (206/263-6324) ' Phone Qwest ' 23315—66th Avenue S. Kent, WA 98032 Contact: Melanie Wheeler (206/345-4055) Cable Comcast ' 4020 Auburn Way N. Auburn, WA 98002 Contact: Jim Nies (253/288-7531) ' Water ' City of Renton Renton City Hall—5th Floor 1055 South Grady Way Renton,WA 98055 ' Contact: Abdoul Gafour (425/430-7210) King County ' 201 South Jackson Street MS: KSC-TR-0231 Seattle, WA 98104 Contact: Earl Fisher (206/296-6576) Coal Creek Utility District 6801— 132nd Place SE' Newcastle, WA 98059-1415 Contact: Larry Jones (425/235-9200) Fiber Optics ' 360 Network 4976—328th Avenue NE ' Carnation, WA 98014 Contact: Will Dronen (206/920-0248) Potential Utility Conflicts As part of the preliminary analysis, a review of existing utilities and potential conflicts was ' performed to identify significant impacts due to major elements of the construction. Known conflicts that will likely require utility relocations are identified in Table 5-1. ' Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABW FAPWT-04-032 ' City of Renton,Washington 5-2 September 2004 ' Table 5-1. Utility Conflicts Existing Start B Sta. End B Sta. Offset Conflicting Proposed Utility Element Water (W) 174+30 205+72 13'—36' Rt. New Roadway/Pavement 180+50 203+00 16' Lt. New Roadway/Pavement ' Connections to existing side streets, water New Roadway/Pavement meters, and fire hydrants Gas (G) Line along Northeast 18th Street New Roadway/Pavement ' Power (P) 182+83 184+18 28' Lt. New Roadway/Pavement Overhead 186+20 192+70 26'—40' Rt. New Roadway/Pavement ' 191+14 192+05 40'—64' Lt. New Roadway/Pavement 196+89 204+21 24'—26' Rt. New Roadway/Pavement 204+21 212+00 0'—60'Rt. New Roadway/Pavement ' 212+00 219+42 0'—72'Lt. New Roadway/Pavement Lines run from power poles to residences in numerous locations Power (P) Underground 177+00 182+36 32'—60'Rt. New Roadway/Pavement ' 182+51 184+36 42'—44' Rt New Grading 183+82 184+21 49'—50' Rt. New Grading ' Overhead Overhead lines run from power poles to residences in numerous locations along Telephone (T) the proposed corridor. Buried 182+90 191+99 29'—40' Rt. New Roadway/Pavement ' Telephone (T) Fiber Optic Underground lines along Sunset Blvd. within intersection limits (FO) ' Storm Drain 173+50 180+59 24'—33' Lt. New Roadway/Pavement (SD) 173+50 173+76 29' Rt. New Roadway/Pavement 177+29 181+50 28'—36' Rt. New Roadway/Pavement ' 179+39 193+41 16'—31' Rt. New Roadway/Pavement 181+14 181+52 24' Lt. New Roadway/Pavement 182+19 182+67 20'—22' Lt. New Roadway/Pavement 182+43 182+56 22'—29' Rt. New Roadway/Pavement 183+50 183+69 19' Lt. New Roadway/Pavement 183+81'` 184+20 17'— 19' Lt. New Roadway/Pavement ' 184+63 184+72 16' Lt. New Roadway/Pavement 185+35 185+61 14'— 15' Lt. New Roadway/Pavement 186+09 187+02 13' Lt. New Roadway/Pavement ' 189+07 191+97 41'—42' Rt. New Roadway/Pavement 189+98 196+12 16'—20' Lt. New Roadway/Pavement 196+23 199+77 29'—35' Rt. New Roadway/Pavement ' 196+82 197+39 14' Lt. New Roadway/Pavement 198+08 198+29 15' Lt. New Roadway/Pavement 199+53 200+26 13' - 23' Rt. New Roadway/Pavement 199+77 199+99 0'—28' Rt. New Roadway/Pavement 199+99 200+26 0'— 13' Lt. New Roadway/Pavement 200+46 200+71 13' Rt. New Roadway/Pavement 201+09 201+31 33'—34' Rt. New Roadway/Pavement ' Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 ' City of Renton,Washington 5-3 September 2004 ' Existing Start B Sta. End B Sta. Offset Conflicting Proposed Utility Element ' 201+44 201+72 33' Rt. New Roadway/Pavement 202+50 203+17 14' Lt. New Roadway/Pavement 204+23 204+67 29'Rt. New Roadway/Pavement Lines run to catch basins and other drainage features along corridor ' Sanitary Sewer 173+95 176+48 39'—41' Rt. New Roadway/Pavement (SS) 175+56 199+77 11'—71' Lt. New Roadway/Pavement 194+16 196+29 35' Rt. New Roadway/Pavement Lines run from residences in numerous locations along,corridor ' Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 ' City of Renton,Washington 5-4 September 2004 ' SECTION 6—ENVIRONMENTAL CONSIDERATIONS AND PERMITS Introduction The proposed improvements and associated ROW acquisition raise several environmental considerations that must be addressed, including the following. ' ■ Presence of and potential impacts to wetlands ■ Noise impacts from both the construction and the completed project ' Duringthe design process for the Duvall Avenue NE/Coal Creek Parkway SE project, these g p environmental issues must be addressed both during the environmental review processes and in ' obtaining required permits from jurisdictional regulatory agencies. A number of studies (discussed below) were conducted as part of the preliminary design phase of the project. These studies will be relied upon to complete the environmental review. ' Topography The proposed project is located in west central King County,Washington, approximately 2 miles southwest of Cougar Mountain and approximately 2 miles east of Lake Washington. Two-thirds of the project corridor is location within the City of Renton. The remaining one-third is located in unincorporated King County, between the cities of Renton and Newcastle. The City of Renton ' segment of the project is located in an upland area and the existing roadway alignment ranges in elevation from Elevation 410 feet to Elevation 428 feet. The King County segment of the project descends into the May Creek Valley, and the existing roadway alignment ranges in elevation from ' Elevation 350 feet in the north to Elevation 422 feet in the south. Geology/Soils ' The geology of the area consists primarily of glacial and postglacial deposits. Landforms in the area are primarily the result of recent glaciation, erosion, sedimentation, and modification by road building activities. Deposits include recessional outwash, glacial till, advance outwash, and ' glaciolacustrine,silts and clays. Deposits of colluvium are also expected in the corridor. Colluvium is a soil unit that covers a hill slope and is of the same material that underlies the hill slope. Colluvium is generally very loose material and may range in thickness from a few inches to several feet depending on slope angle, age, vegetation, and geologic origin. Water'Resources ' The project area is located within the May Creek basin in the lower basin subarea. The basin is approximately 14 square miles and drains to Lake Washington. The northern-most portion of the project area is approximately 1,000 feet south of May Creek. The project corridor is located between ' uplands on the west side of the roadway and the basin, which is northeast of the roadway. The principal sources of hydrology to the area are stormwater runoff, surface flows, and groundwater. Water is channelized through open ditches and culverts along the roadway. ' The average annual precipitation in the area is approximately 35 inches, with 75 percent of annual precipitation occurring from October to March (Soil Survey of King County Area, Washington). Vegetation Vegetation adjacent to the project corridor consists mostly of roadside weeds and residential tlandscaped lawns. The vegetation in the open areas is dominated by upland plant communities:big- Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 ' City of Renton,Washington 6-1 September 2004 leaf maple (Acer macrophyllum), red alder (Alnus rubra), Himalayan blackberry (Rubus procerus), trailing blackberry (Rubus ursinus), western red cedar (Thuja plicata), sword fern(Polystichum ' munitum), and reed canary grass (Phalaris arundinacea). Invasives such as Himalayan blackberry (Rubus procerus) and reed canary grass (Phalaris arundinacea)were prevalent throughout the project area. Open ditches along the roadside were comprised of invasive herbaceous species. ' Information provided by the Washington Natural Heritage Program (October 2003) indicated that there were no records for rare plants or high-quality native ecosystems in the vicinity of the project area. Wildlife Wildlife habitat and species information has been requested from U.S. Fish and Wildlife Service ' (USFWS) and the Washington State Department of Fish and Wildlife (WDFW), as well as National Oceanic and Atmosphere Administration (NOAA)Fisheries. The following species were listed as potentially occurring within the project vicinity. ' Mammals ■ Canada lynx ' ■ Gray wolf ■ Grizzly bear ■ Pacific fisher (candidate) ' Birds ' ■ Bald eagle ■ Marbled murrelet ■ Northern spotted owl ■ Yellow-billed cuckoo (candidate) ' Fish ■ Bull trout ■ Chinook salmon (Puget Sound ESU) (threatened) ■ Coho salmon (Puget Sound/Straight of Georgia ESU) (candidate) ' Cultural The proposed project is located within King County in the cities of Newcastle and Renton. According ' to the 2000 U.S. Census, the population of Renton is 50,052 and the population of Newcastle is 7,737. A report from the Washington State Office of Archaeology and Historic Preservation (OAHP) will be ' obtained for the proposed Area of Potential Effects (APE). An historic resource inventory and technical report will be prepared in accordance with applicable OAHP and U.S. Secretary of Interior standards. ' Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 ' City of Renton,Washington 6-2 September 2004 ' Land Use ' In the past, mining, logging, and farming activities took place in the region. Presently, land use in the immediate vicinity is residential and commercial development. A series of housing developments surround the area, as well as private and public open space. There are also some rural residences, small farms, and forested land outside of the immediate project vicinity. ' Currently, the project area is zoned as incorporated city and residential(King County Zone Atlas, November 2001). Per the King County Comprehensive Land Use Map (August 2002), the project vicinity is urban residential with small areas of open space/recreation and urban greenbelt. Duvall Avenue SE is classified as a primary arterial. Environmental Site Assessment An environmental reconnaissance stud was conducted b GeoEngineers in April and May 2004. Y Y � P Y Although elements common to a Phase I Environmental Site Assessment(ESA) were evaluated, the ' study does not constitute an ASTM Standard E 1527-00 Phase I ESA. The purpose of the study was to evaluate environmental conditions located along the project corridor to determine the,potential presence of hazardous substances from on- or off-site sources that may affect or impact the project ' area. Visual reconnaissance of the site (45 parcels) was conducted in April and May 2004 to identify potential sources of contamination. The study included reviews of federal, state, and local environmental databases for information on environmental problems at or near the site. Historical photographs, maps, title reports, and tax records were'reviewed to determine land development history and the possible use, generation, storage, disposal,annd/or release of hazardous substances. Based on the information reviewed and site reconnaissance, it was concluded that there was no evidence of commercial activity within the study area with potential for environmental issues or impacts (GeoEngineers, June 2004)., Heating oil underground storage tanks (USTs) and ' aboveground storage'tanks (ASTs)were found to be located within the project area. These parcels with the USTs or ASTs received a high ranking for soil and groundwater contamination potential because of the proximity of the tanks to the.existing road. It is recommended that either the ' construction plan incorporate a soil handling and disposal plan or that soil and groundwater sampling/testing be completed prior to construction. Those sites with tanks located within 50 feet from the existing road received a"moderate ranking. Releases from these tanks were considered unlikely to impact the project due to thel:r distance from the project site. The study also addressed the potential for petroleum release at the ARCO service station site (former 7-11 service station). It was recommended that further investigation be completed as petroleum releases may have contaminated soil and/or groundwater at the south end of the project site. Geotechnical borings were ' completed for determination of fill type and thickness, and it was concluded that the potential for uncontrolled and contaminated fill within the project area was low. ' Based on the findings from the environmental reconnaissance study, it was recommended that an ASTM Standard Phase I ESA be conducted to evaluate the long-term environmental liability (GeoEngineers, June 2004). ' Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 6-3 September 2004 Wetlands A Wetland Investigation and Delineation Report(Widener and Associates, 2004) was conducted to delineate the location and extent of waters, including wetlands, within the project area of Duvall Avenue SE/138th Avenue SE/Coal Creek Parkway SE. Wetlands were delineated consistent with the Washington State Wetlands Identification and Delineation Manual(DOE, 1997) and the USACE Wetland Delineation Manual (1987 Manual). Based on the data collected and site visits conducted in August 2004, four wetlands were identified within the project area. Wetland A is located within the drainage ditch along the west side of the roadway. It begins approximately 200 feet north of Southeast 100th and continues north beyond Southeast 95th Way and outside the project area. The primary source of hydrology to the open ditch was determined to be stormwater runoff;however, groundwater seepage contributes as well (see Table 6-1). Table 6-1. Wetlands in the Duvall Avenue SE Project Area Wetland Classification Size.(sq. ft.) Ecology ` King King Rating County County Rating -Buffer Width ' A PEM 3,220 III III 50 B PEM 2,526 III III 50 C PEM 1,952 III III 50 E PEM, PSS 1,084 III 111 50 PEM=Palustrine emergent PSS=Palustrine scrub-shrub *Wetland D is not located within the project area. Wetland B is located on the west side of the roadway and extends within a ditch line north from 21st Street to the culvert just north of Southeast 100th. The water then flows through the culvert and into a stream channel in the ravine, east of the roadway. The primary source of hydrology to the ditch was determined to be stormwater runoff from the residential area west of Duvall Avenue/138th Avenue SE. Wetland C is located within a ditch line on the east side of the roadway and extends north from 21st Street to approximately 300 feet north of Southeast 100th. The water flows northward through a culvert system within the ditch, under driveways, and down into the ravine,joining the stream channel and the waters from Wetland B. The primary source of hydrology to the open ditch system of Wetland C is also stormwater runoff and groundwater seepage. The edge of Wetland D is located approximately 400 feet east of the roadway, outside of the project area. It is a palustrine forested, shrub, and emergent wetland that receives hydrology directly from the stream flow of stormwater runoff into the ravine, as well as surfacewater and groundwater seepage from the adjacent hillside. The wetland is hydrologically connected to May Creek through perennial stream systems and associated wetlands. Wetland E is located within a small basin, approximately 35 feet from the edge of the roadway within the steep ravine and at the toe of the slope on the east side of 138th Avenue SE. The hydrology source was determined to be groundwater and surface runoff. The wetland is isolated, as it is not connected to a water body nor is it associated with another wetland. None of the wetlands in the project area were valued as having highly functioning biological capacities. Functional capacity is limited by uniform vegetation, small size, and location adjacent to urban areas and roadway. These wetlands were valued as having low to moderate functioning Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 6-4 September 2004 capacities for water storage and delay, sediment stabilization, nitrogen removal, and primary production. They have low habitat support function for invertebrates, amphibians, turtles, songbirds, breeding waterbirds, and wintering and migratory waterbirds. These wetlands were not valued as having thermoregulation, resident fish habitat support, or anadromous fish habitat support functional capacities. None of the wetlands within the project area were determined to be jurisdictional wetlands as defined by USACE regulatory guidance. The wetland report has not been submitted to USACE; therefore, a federal jurisdictional determination is pending review by the USACE. Mitigation for jurisdictional wetlands is not anticipated;however, this determination is contingent upon approval of the Wetland Identification and Delineation Report by USACE. Floodplain The project area is not located within a floodplain based on the Federal Emergency Management Agency(FEMA) U.S. Flood Areas Map. Water Quality The principal sources of hydrology to the area are stormwater runoff, surface flows, and groundwater. The hydrology in the area has been dramatically impacted by the increase of impervious surface from developments in the upland areas and has resulted in an increase of stormwater runoff. Water pollutants, such as total suspended solids, nitrogen, phosphorus, copper, and zinc, are commonly generated by traffic. The roadway improvements could have temporary impacts to water quality during construction operations. These impacts would be mitigated using erosion control and water pollution prevention techniques as required by DOE. Roadway runoff within the project limits will be collected and conveyed to water quality treatment facilities. Water quality treatment facilities will be designed, operated, and maintained in accordance with the stormwater design standards specified by the DOE Stormwater Management Manual for Western Washington. Air Quality The project is located within the maintenance area for criteria pollutants carbon dioxide (CO) and ozone (03). The project is included in the Transportation Improvement Plan (TIR) for Puget Sound Region and is therefore in conformance with the State Implementation Plan (SIP) for air quality. Temporary impacts to air quality during construction will be mitigated by incorporating best management practices (BMPs) for dust control. Noise Widener &Associates undertook a technical noise study in April 2004 to document and analyze existing road traffic noise conditions and predict future traffic noise conditions in the project vicinity. Existing conditions were compared with the no build and future condition for the year 2030. The study shows that noise impacts (as defined by FHWA/WSDOT)would occur as a result of the proposed project. All impacts are due to the sound level criterion being met or exceeded, and none are the result of a"substantial increase" over the existing condition. Based on the results of this study, abatement measures were fully evaluated in accordance with FHWA and WSDOT noise abatement policy. It was concluded that none of the abatement options were reasonable and feasible. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 6-5 September 2004 Environmental Review and Permits Biological Resource Report A biological resource report will be required to evaluate the potential effects of the project on proposed, candidate, listed species, and other wildlife species within the project area as required by SEPA. The report will address direct and indirect impacts as a result of the project within the project action area. This report will summarize potential impacts to species and will make Irecommendations to minimize impacts by avoidance, mitigation, or minimization measures if necessary. Environmental Review Approval of the proposed roadway and funding by local and state agencies will require SEPA documentation. Discussions with agencies responsible for the environmental documentation indicate these requirements can be met with an expanded checklist for SEPA as supported by the,technical discipline reports. The following is a preliminary assessment of the questions that will need to be answered in the formal environmental review for this project during the final design phase. Environmental Legislation and Requirements Will the following environmental legislation and re uirements affect the pro osal? Yes``' Maybe No 1 Coastal Zone Management Act X 2 Executive Order 11988(Flood Plains) X 3 Executive Order 11990 (Wetlands) X 4 National Historic Preservation.Act, X (Section 106 5 Farmland Protection Policy Act ' ! X ' (Prime and Unique Farmlands) 6 Land Use Requirements X 7 Section 4(f) X 8 Endangered Species Act X 9 Highway Improvements in the Vicinity X ofAirports 10 Fish &Wildlife Coordination Act X 11 Clean Water/Safe Drinking Water Act X 12 Wild & Scenic Rivers Act X 13 Clean Air Act- X 14 Hazardous Waste Act X 15 Noise Requirements X 16 National Forest Management Act X Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 6-6 September 2004 i Comments No Section 4(f)properties, wild and scenic rivers, or national forest lands are present within the project area. No unique or prime farmland located within the project area. Jurisdictional determination for wetlands is pending. Permits Will the following permits be needed? Federal Yes Maybe No 1 USACE's Section 404 Permit, Clean Water Act of 1977 (P.L. X 95-217, Section 404) 2 U.S. Coast Guard Permit, Rivers &Harbors Act and the X ' Surface Transportation Assistance Act 3 Special Use Permit (Forest Service) X 4 Other: Forest Service Road Use, Mineral X Use, Staging/Camping, and Fire Permits 5 National Pollution Discharge Elimination System NPDES) X' Comments 1. Pending jurisdictional determination from USAGE. State/County Yes Maybe No 1 Grade/Clearing Permit'(King County, City of Renton, City of X Newcastle) 2 Coastal Zone Management X 3 Critical Areas Ordinance X 4 ''Flood lain Development X 5 Shoreline Permit X 6 State Waste Discharge Permit X 7 Hydra c Project Approval(WDFW) X 8 Other: Section 401 Certification X 9 NPDES X Comments No coastal, shoreline, or in-water work. Jurisdictional determination for wetlands is pending and culvert replacement will likely require an HPA. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 6-7 September 2004 Tribe Yes Maybe No 1 Hydra c Permit Approval X 2 National Historic Preservation Act—Section 106 X Concurrence Comments ' No tribal lands within project area. Possible traditional use area by recognized tribes. Impacts Will the following environmental legislation and requirements affect the proposal? For each question, the impact is shown as high (H), medium (M), low(L), or not applicable(N/A). If the impact is high or medium, the comments section contains a discussion of the impact, mitigation being considered, and differences that may exist among alternatives. In some cases, comments have been provided for low impacts for clarification. Earth Will the proposal result in H M L N/A 1 Unstable earth conditions or changes in geologic X substructures? 2 Disruptions, landslides, displacement, compaction, or over X covering of the soil? 3 A change in topography or ground surface relief features? X 4 The destruction, covering, or modification of any unique X geologic or physical features? 5 Any increase in wind or water erosion of soils either on or off X the site'? 6 Changes in deposition or erosion of beach sands, which may X modify the bed of the ocean, bay, or inlet? 7 Changes in siltation, deposition, or erosion which may X modify the channel of a river or stream or the bed of a lake? ' Comments 2. Construction activities include clearing, grading, laying base, and paving. These activities will not result in large areas of disturbance or cause major soil disruption. 4. No unique geologic or physical features are present or will be covered. 5. There is potential for a temporary increase in wind or water erosion during periods of construction when soils are bare. However, erosion control methods will be used to minimize erosion through the use of silt dams, silt fences, scheduling of ground disturbing work, revegetation and seeding. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 6-8 September 2004 7. Temporary erosion control measures would be implemented to minimize siltation and deposition of material into adjacent drainage courses during the construction phase until permanent revegetation and erosion control measures can be established. Erosion control would be addressed through the NPDES permit. ' Air Will the proposal result in H M L N/A 1 Air emissions or deterioration of ambient airquality? X 2 The creation of objectionable odors? X 3 An inconsistency with regional air quality requirements? Comments 1. Construction of the project would result in short-term exhaust emissions from construction equipment, dust generation during grading, and hauling activities. Dust abatement will be required during grading and hauling activities on nonsurfaced facilities. 3. The project is on the SIP and is therefore consistent with regional air quality requirements. Water Will the proposal result in H M L N/A 1 Changes in currents, or the course of direction of water X movements, in either marine or fresh waters? 2 Changes in absorption rates, drainage patterns, or the rate X and amount of surfacewater runoff? 3 A change in the amount of surfacewater in any water body? X 4 Discharges into surfacewaters or any alteration of X surfacewater quality including but not limited to tem erature, dissolved oxygen, or turbidity? 5 The alteration of the direction or rate of flow of X oundwaters? 6 A change in the quantity of groundwater either through X direct additions or withdrawals or through interception of an aquifer by cuts or excavations? 7 The deterioration in groundwater quality either through X direct injection or through the seepage of leachate, phosphates, detergents, waterborne virus, or bacteria, or other substances into the oundwaters? 8 The reduction in the amount of water otherwise available X for public water supplies? 9 Alterations to the course or flow of flood waters? X 10 Placing fill below the ordinary high water mark of rivers X ' and streams? 11 Encroachment into a 100-year flood plain or regulated X flood way? Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 6-9 September 2004 MComments 2. The project involves the realignment and widening of Duvall Avenue SE. The anticipated impact to water is related to stormwater, surface water, and groundwater flow. 3. May Creek is located north of the project area. Wetlands Will the proposal cause H M L N/A 1 The removal of hydro h tic vegetation? X 2 The covering or replacing of any h dric soil? X 3 The alteration of the hydrology? X 4 1 A change in function or value? X Comments All Jurisdictional determination has not been made. Impacts will be mitigated in accordance with ' USACE requirements for no net loss of function or value. Flora Will the pro osal result in H M L N/A 1 A change in the diversity of species or numbers of any X species of flora (including trees, shrubs, grass, crops, micro flora, and aquaticplants)? 2 An effect on any unique, rare, or endangered species of X flora? 3 The introduction of new species of flora into an area or a X barrier to the normal,replenishment of existing:species? Comments All Based on the developed nature of the surrounding landscape, low impacts are currently anticipated for these categories. Fauna Will the proposal result in: H M L N/A 1 Changes in the diversity of species or numbers of any species X of fauna (birds, land animals including reptiles, fish and shellfish, benthic organisms, insects, or micro fauna)? 2 An effect on any threatened or endangered species of fauna? X 3 The introduction of new species of fauna into an area or result X ' in a barrier to the migration or movement of fauna? 4 1 The deterioration of, or interference with, fish or wildlife X critical habitat? Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 6-10 September 2004 Comments All Based on the developed nature of the surrounding landscape, low impacts are currently anticipated for these categories. Noise 1 1 Will this proposal increase existing noise levels? X Comments 1. Noise impacts are due to the sound level criterion being met or exceeded, and none are the result of a"substantial increase"over the existing condition. Land Use Will the pro osal cause H M L I'N/A 1 The alteration of the present or plann2d land use of an area? X 2 The reduction in acreage of any agricultural products? X 3 The reduction in acreage of any prime and unique farmland? X Comments All ROW acquisition would be necessary for realignments.Agricultural land is not present in the immediate vicinity of the project. Natural Resources Will the proposal cause H IM I L I N/A 1 An increase in the use of any natural resources? I I X 2 The reduction of any nonrenewable natural resources? I I X Comments All Reconstruction of the road would require the use of crushed aggregate, a natural resource, for base and pavement. There would be a minor irretrievable commitment of fossil fuel for construction purposes. Energy Will the pro osal cause H M L N/A 1 The use of substantial amounts of fuel or energy? X 2 The savings of substantial amounts of fuel or energy? I X ' Comments All Fossil fuels would be irretrievably committed to the construction of the road improvements. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 6-11 September 2004 Aesthetics Will the proposal cause H M L N/A 1 A change in a scenic vista or view as seen from the road? X 2 A change in a scenic vista or view for viewers of the road? X 3 A conflict with the scenic management plans of other X agencies? 4 New light orglare? X Comments 1. Within the City of Renton, power lines will be underground, which will improve the view quality of the project corridor. All The view of and from sections of the road would be minimally altered. The road would not transit through any new landscapes. Lights from the traffic traveling on the road are expected to increase the light and glare in the vicinity.` Recreation H M L N/A 1 Will this proposal cause an impact upon the quality or quantity X of existing recreational opportunities? Comments 1. Recreational opportunities are currently minimal within the project area. The project will add bike lanes to the roadway and is, therefore, expected to enhance recreational opportunities for cyclists. Archaeological/Flistorical Will the proposal result in H M L N/A 1 The alteration of an important archaeological site? X 2 The alteration of a historical site,structure, object, or X building? 3 The alteration of a traditional cultural property? X Comments All OAHP will be obtained for the proposed Area of Potential Effects (APE). Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 6-12 September 2004 Hazardous Waste Will the proposal H M L N/A 1 Affect a known hazardous waste site on the EPA's National X Priority List(NPL)or a statewide inventory? 2 Affect a site with the potential for hazardous waste (e.g., X sanitary landfills, gasoline stations, industrial sites)? 3 Affect human health by creating a health hazard or a X potentially unhealthy situation? 4 Increase the likelihood of an explosion or release of hazardous X substances (including but not limited to oil, pesticides, chemicals, or radiation) in the event of an accident? Comments All An environmental reconnaissance study has been conducted. Socioeconomic Will the proposal H M L N/A 1 Alter the location, distribution, density,or growth rate of the X human population of an area? 2 Affect racial, ethnic, religious, minority, elderly, or low-income X groups? 3 Affect existing housing (including but not limited to rural or X urban residences and business yr commercial buildings)? 4 Create a demand for additional housing? X 5 Affect local employment, taxes,property values, etc.? X Comments 3. ROW acquisition would be.necessary for realignments. 5. During the construction phase,the project would provide a short-term increase in construction- related jobs and benefit local businesses and materials suppliers. In addition, the proposed safety enhancements on the roadway may have long-term benefits for the local and regional economy because they would make the roadway a safer route for residents. Owners of the affected properties shall be paid the fair market value for the land acquired and paid any damages to remaining property if damages occur. Property acquisitions, compensation, and benefits will be calculated in accordance with pertinent state laws. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 6-13 September 2004 Public Services Will the proposal have an effect upon or result in a need for new or altered services in any of the following areas? H IM L I N/A 1 Fireprotection? X 2 Policeprotection? X 3 Schools? X 4 Maintenance of public facilities (including roads)? X 5 Airport.. X 6 Religious institutions or facilities? X 7 Health services? X 8 Mail delivery? X 9 Parks and recreational facilities? X 10 Other services? X Comrnents All Over the long term, the improvements to the roadway would provide safer and more reliable access for services such as fire protection, law enforcement, and emergency medical service. Over the short term, services may be impacted by construction and the need to use detour routes. Transportation/Circulation Will the proposal cause H IM L I N/A 1 An increase in motor vehicle movement? X 2 An increase in the movement of bicycles, pedestrians, or X equestrians? 3 Increased traffic hazards to cyclists, pedestrians, or X equestrians? F74 Existing parking facilities to be affected or create a demand X for new arkin ? 5 Changes in access? X 6 An impact u on existn trans ortation systems? X An im act upon waterborne, rail, or air traffic? X 8 Impacts associated with construction activities (e.g., detours, X temporary delays)? Cornrnents 2. The project will include the installation of sidewalks and bicycle lanes, thereby improving mobility for these forms of transport. 5. The project will result in a change in access to several commercial properties near SR 900, as well as private residences. Access to all properties impacted will be maintained both during and after construction. 6. The project area is used for access to residences and surrounding rural areas, as well as local services. Improvements to the operational and safety characteristics will benefit all users. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 6-14 September 2004 8. Construction activities would cause minor delays for traffic during the construction period. A traffic control plan would be necessary to minimize the inconvenience to traffic. Utilities Will the proposal cause a need for news stems or alterations of the following utilities? H IM L I N/A 1 Power or natural as? X 2 Communications systems? X 3 Water? X 4 Sanitary systems or septic tanks? X 5 Stormwater drainage? X 6 Irrigation system? X 7 Solid waste disposal? X 8 Pipelines? X' 9 Cable TV? X Comments All The realignment of the road is likely to impact utilities,resulting in the need to relocate (temporarily or permanently) utility lines. Overhead utilities, including power, will be underground however, it is not anticipated to have extended periods of interrupted service. Cost of moving utilities underground will be borne by the project which will minimize the cost of relocation of utilities to the rate payors. Natural Resources It is not anticipated that the project will have any adverse impacts to natural resources. Summary of Project Impacts Environment Significant or adverse impacts to the environment are not anticipated as a result of the project. g P p Environmental considerations included wetlands, noise, biological resources, and water quality. Results of these investigations will be incorporated into the SEPA process and will be available to the public for review and comment. The wetland investigation and delineation report concluded that the wetlands within the project area were not jurisdictional wetlands. Mitigation for jurisdictional wetlands is not anticipated; however, jurisdictional determination is pending review by USACE. The noise report concluded that noise impacts are due to the sound level criterion being met or exceeded, and none are the result of a"substantial increase"over the existing condition. Abatement measures were fully evaluated in accordance with the FHWA and WSDOT noise abatement policy, and it was determined that none of the abatement options were reasonable and feasible. A biological resource report will be required to evaluate the potential effects of the project on proposed, candidate, listed species, and potential wildlife and fauna within the project area as required by SEPA. This report will summarize potential impacts to species and fauna and will make recommendations to minimize impacts by avoidance, mitigation, or minimization measures if necessary. Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 6-15 September 2004 Water quality impacts during and post-construction are expected to be minor. Water quality treatment facilities will be designed, operated, and maintained in accordance with the stormwater design standards specified by the DOE Stormwater Management Manual for Western Washington. f 'N b '- ,5V Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 6-16 September 2004 SECTION 7—IMPLEMENTATION AND FUNDING Recommended Plan The recommended plan for further implementation is defined in the design report plans included in Volume 3 and in this design report. Preliminary Project Costs An estimate of construction cost has been prepared for the recommended plan based on preliminary design and quantities generated from the design. The unit costs are based on bid tabulations of recent, similar municipal and WSDOT projects. A preliminary estimate of cost is provided in Appendix F. All costs include sales tax, construction contingency, design and construction engineering costs, administrative costs, and permitting costs. Preliminary Cost Allocations ' The Duvall Avenue NE/Coal Creek ParkwaySE reconstruction project is divided into three areas: P J the intersection of Duvall Avenue NE and Northeast Sunset;Blvd;Duvall Avenue NE/Coal Creek Parkway SE in the City of Renton; and Duvall Avenue NE/Coal Creek Parkway SE in King County. The intersection project will be constructed with funds specifically allocated for the project. The funds for the roadway reconstruction will be divided between the City of Renton and King County. The City of Renton/King County limits are located at STA 201+33. South of B STA 201+33 is City of Renton jurisdiction, while north is King County jurisdiction. Several parcels along the west side of Duvall Avenue NE/Coal Creek Parkway SE, north of B STA 201+33, are located in the City of Renton as the boundary line travels along the ROW line from B STA 201+33 to B STA 204+44. Estimated total project costs are divided between the City of Renton and King County as shown in Table 7-1. A more detailed breakdown of project costs is included in Appendix F in Volume 2. Table 7-1. Summary of Preliminary Cost Allocations Project Element City of Renton King County Duvall Avenue NE/Coal Creek $3,094,253 $3,468,202 Parkway SE Roadway ROW $1,384,756 $1,591,303 Funding Funding sources for implementation of the Duvall Avenue NE/Coal Creek Parkway SE project include, but are not limited to, the following. Identified Sources ■ WSDOT/FHWA.Hazard Elimination Safety (HES) ■ City of Renton ■ King County ■ Washington State Transportation Improvement Board (TIB) Draft Design Report Duvall Avenue NE/Coal Creek Parkway SE Reconstruction BERGER/ABAM,FAPWT-04-032 City of Renton,Washington 7-1 September 2004 ' - IOGRAPHY SECTION 8 BIBLIOGRAPHY Plans and Reports GeoEngineers, Geotechnical Engineering Services, Duvall Avenue Northeast Improvements (Draft), i 22 March 2004. King County Department of Public Works, Environmental Impact Statement(Final), September 1995. Mirai Associates, Duvall Avenue Corridor Traffic Analysis Report(Draft),April 2004. Widener &Associates, Noise Report, Duvall Avenue NE/Coal Creek Parkway Widening Project (Draft), 4 August 2004. Widener &Associates,Wetland Investigation Report, Duvall Avenue NE/Coal Creek Parkway Improvements Projects (Draft), 22 March 2004. Design Standards Washington State Department of Transportation (WSDOT)Publications ■ WSDOT Design Manual ■ Bridge, and Municipal Construction WSDOT Standard Plans for Road, ■ WSDOT Hydraulic Manual ■ WSDOT'Highway Runoff Manual ■ WSDOT Sign Fabrication Manual Washington State Department of Ecology ■ Stormwater Management Manual for Western Washington King County ■ King County Road Standards ■ King County Surfacewater Design Manual i AASHTO ■ Policy on Geometric Design of Highways and Streets City of Renton ■ Renton Municipal Code e, and Municipal Construction ■ City of Renton Standard Plans for Road, Bridg U.S.Army Corps of Engineers ■ Wetlands Delineation Manual Federal Highway Administration ■ Manual on Uniform Traffic Control Devices for Streets and Highways Draft Design Report BERGER/ABAM,FAPWT-04-032 Duvall Avenue NE/Coal Creek Parkway SE Reconstruction 8 1 September 2004 City of Renton,Washington 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1