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City of Renton Seaplane Base Maintenance Dredging, Challenges Beyond the Scope of Maintenance Dredging

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City of Renton Seaplane Base Maintenance Dredging, Challenges Beyond the Scope of Maintenance Dredging Proceedings of Western Dredging Association and Texas A&M University Center for Dredging Studies' "Dredging Summit and Expo 2015" CITY OF RENTON SEAPLANE BASE MAINTENANCE DREDGING, CHALLENGES BEYOND THE SCOPE OF MAINTENANCE DREDGING J. G. Dawson1, R. S. Phillips2 ABSTRACT The City of Renton’s (City) Will Rogers-Wiley Memorial Seaplane Base is located at the southern end of Lake Washington in Renton, Washington, adjacent to the Cedar River delta. Maintenance dredging was required at the end of 2013 in order to mitigate for Cedar River flooding that occurred in 2009, which caused large amounts of sediment to be deposited near the existing seaplane base facilities. Built-up sediment near the temporary mooring facilities and access ramp had a significant effect on seaplane pilot safety, due to limited depths during taxi, take-off and landing operations. Coast & Harbor Engineering was hired to assist with regulatory permitting, final design and assist with construction management during dredging operations. Several issues related to permitting, the development of feasible design criteria, and restriction son construction operations, made dredging at the seaplane base challenging. The first issue of the project was that a portion of the dredge prism was within Washington State submerged lands, which meant the Federal Emergency Management Administration (FEMA) was partially responsible for providing financial assistance to the City of Renton for dredging activities as part of mitigating the effects of the 2009 flood event. Second, a portion of the dredge prism was within privately owned submerged lands requiring the City to obtain easements to dredge these areas. Third, King Country Metro sewer lines and private communication lines restricted the dredge prism to strict offsets, limited room for construction equipment and required atypical dredge cuts. Fourth, the unique location of the seaplane base relative to the Cedar River outlet and delta formation made water quality monitoring for the protection of migrating salmon difficult during dredging construction. Lastly, the seaplane base is located at the end of the City’s main runway for the Renton Municipal Airport requiring the Federal Aviation Administration (FAA) to regulate all construction related activity conducted within the vertical elevation prism (determined by the FAA). From a construction logistics and scheduling perspective, these restrictions made the potential for aviation-related construction delays critical to the Contractor meeting their developed schedule. The unique location, property boundaries, physical restrictions and State and Federal regulations made maintenance dredging at the City of Renton’s Will Rogers-Wiley Memorial Seaplane Base challenging within several aspects of permitting, design and construction. Dredging started in December 2013 and was successfully completed in February 2014. Dredging operations restored the seaplane base to pre-2009 Cedar River flood conditions and allowed pilots to enjoy a safer and more operable facility. Keywords: Dredging, flooding, seaplane, aviation, water quality, federal INTRODUCTION The City of Renton’s (City) Will Rogers Wiley Post Memorial Seaplane Base is located at the southern end of Lake Washington in Renton, Washington. The seaplane base is situated along the shoreline, directly north of the City’s municipal airport (Clayton Scott Field) utilized by both private and commercial airplane traffic, most notably the Boeing Commercial Airline Company, which uses the municipal runway for the initial flights of Boeing 737 aircraft. The seaplane base is used primarily by private aircraft (e.g. seaplanes and/or float planes), allowing tenants to utilize a launch ramp, maneuvering basin and temporary moorage along two (2) floating concrete docks, one orientated in the east-west directions and one orientated in the north-south directions. 1 Coastal Engineer, Coast & Harbor Engineering, a Division of Hatch Mott MacDonald, 110 James Street STE 101, Edmonds, Washington, 98020, USA, T: 425-778-5763, Fax: 425-778-6883, Email: [email protected]. 2 Principal Coastal Engineer, Coast & Harbor Engineering, a Division of Hatch Mott MacDonald, 110 James Street STE 101, Edmonds, Washington, 98020, USA, T: 425-778-6042, Fax: 425-778-6883, Email: [email protected]. 286 Proceedings of Western Dredging Association and Texas A&M University Center for Dredging Studies' "Dredging Summit and Expo 2015" Directly east of the City’s seaplane base (approximately 100 meters) is the outllet of the Cedar River, one of the larger tributaries into Lake Washington. As a result of geomorphic processes, a delta and a several dynamic channels have formed at the outlet of the Cedar River into Lake Washington. Figure 1 shows a plan view of the southern end of Lake Washington, the project site, and the approximate extent of the Cedar River delta in the vicinity of the project site. Figure 1. Plan view of the project site located at the southern end of Lakee Washington in Renton, WA. Following a Cedar River flooding eventn in January 2009, large volumes of sediments were carried down the river and deposited within the delta and surrounding areas. Due to the orientation of the delta channels at the time of the 2009 flooding, sediment carried by the Cedar River into Lake Washington was directed at the City’s seaplane base launch ramp, floating concrete docks and maneuvering basin. Deposited sedimennt from the flooding events within the area of the City’s seaplane base severely limited depths required for safe launching, navigation and take- off/landing activities for the seaplane users. This prompted the City to initiate the permitting process, final design and ultimately maintenance dredging construction was conducted tto mitigate for the impacts of the 2009 flooding event. Upon completion of dredging in February 2014, approximately 12,230 m³ (16,000 CY) of material was removed from the City’s seaplane base dredging area. Upon initiating the permitting phase, the City and their consultant, Coast & Harbor Engineering (CHE), a Division of Hatch Mott MacDonald, ran into several permitting, design and constructionn phase related issues that required project-specific strategies and methods to be implemented in order to successfully complete the City’s maintenance dredging project. This paper will present and discuss project-specific issues and complexities due to the unique location, submerged land boundaries, physical restrictions and State and Federal regulations during the permitting, design, and construction phases of the City of Renton’s seaplane base maintenaannce dredging project. Some of the specific issues discussed within this paper include; (1) submerged lands ownership; (2) correspondence with the Federal 287 Proceedings of Western Dredging Association and Texas A&M University Center for Dredging Studies' "Dredging Summit and Expo 2015" Emergency Management Administration (FEMA) as a result of the 2009 flood events; (3) consideration of utility and communication line locations within the design dredging prism; (4) Federal Aviation Administration (FAA) construction safety and phasing; and lastly (5) water quality considderations for the protection of migrating salmon species during construction. The following sub sections describe the project specific challenges and the successful mitigating actions in detail. PROJECT CHALLENGES The projectc -specific challenges the City of Renton faced throughout the permitting, design and construction phases of the Will Rogers Wiley Post Memorial Seaplane Base Maintenance Dredging project extended beyond the common issues associated with most maintenance dredging projects. These project specific issues and challenges encountered by the project team and the contractor throughout the duration of the City’s maintenance dredging project are discussed further within the following sub-sections. Submerged Lands Ownership The initial challenges during the permitting and early design process were directly associated with the horizontal limits of the dredging area and the types of submerged lands ownnerships that existed within it. Figure 2 shows a plan view of the approximate dredge area limits and surrounding area within Lake Washington. The colored areas in the figure represent the different types of submerged land ownership that existed within the horizontal dredge limits. The red area indicates public Department of Natural Resources (DNR) submerged land, the green area represents submerged land leased from DNR by the City, the blue area represents City owned submerged land and the purple/magenta area represents privately owned submerged land. Yellow lines within the figure represent utility (sewer) or communication lines that either run through or adjacent to the dredge prrism. Figure 2. Plan view of the project site located at the southern end of Lake Washington in Renton, WA showing the various typpes of properties (public/private) and utility/communication lines addjacent to or within the dredging area. During the permitting and design phases of City’s maintenance dredging project, offset distances from existing the utilities and communication lines were established and the appropriate submerged lands easements/permissions were 288 Proceedings of Western Dredging Association and Texas A&M University Center for Dredging Studies' "Dredging Summit and Expo 2015" obtained and incorporated into the final design documents. Several other issues directly related to submerged lands ownership within the
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