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Home My WebLink AboutRS_Lake_Study_and_Habitat_Data_Report_240513_v1.pdf Renton Municipal Airport Taxiway A Rehabilitation i ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report CONTENTS Lake Study and Habitat Data Report 1.0 Introduction ................................................................................................................................. 1 2.0 Project Description ..................................................................................................................... 1 3.0 Local Regulations ....................................................................................................................... 4 4.0 Standard Lake Study Narrative ................................................................................................. 6 4.1 Stream and Lake Classification........................................................................................... 6 4.2 Vegetative Cover ................................................................................................................. 6 4.3 Ecological Function ............................................................................................................. 7 4.4 Fish and Wildlife .................................................................................................................. 7 4.5 Measures to Protect Trees and Vegetation ........................................................................ 8 4.6 No Net Loss of Ecological Function .................................................................................... 9 5.0 Habitat Data Narrative ................................................................................................................ 9 5.1 Habitat Diversity .................................................................................................................. 9 5.2 Migration Corridors .............................................................................................................. 9 5.3 Vegetation Cover Types and Associated Species ............................................................ 10 5.4 Disturbed Areas ................................................................................................................. 10 5.5 Existing Habitat Values and Functions ............................................................................. 10 5.6 Proposed Habitat Alterations ............................................................................................ 11 6.0 References ................................................................................................................................ 12 Figures Figure 1 Project Vicinity and 100-Year Floodplain ............................................................................ 2 Figure 2 Waters and Shoreline Jurisdiction within Project Vicinity ................................................... 3 Appendices A. Project Plans B. Photo Log Renton Municipal Airport Taxiway A Rehabilitation ii ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report Acronyms and Other Abbreviations Abbreviation Definition Airport Renton Municipal Airport BGEPA Bald and Golden Eagle Protection Act City City of Renton COR Maps City of Renton Map Viewer EPA U.S. Environmental Protection Agency ESA Environmental Science Associates LED light-emitting diode NWIFC Northwest Indian Fisheries Commission OHWM ordinary high water mark PHS Priority Habitats and Species RMC Renton Municipal Code USFWS U.S. Fish and Wildlife Service WDFW Washington Department of Fish and Wildlife WDNR Washington Department of Natural Resources Renton Municipal Airport Taxiway A Rehabilitation 1 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report RENTON MUNICIPAL AIRPORT TAXIWAY A REHABILITATION AND ASSOCIATED IMPROVEMENTS PROJECT Lake Study and Habitat Data Report 1.0 Introduction The City of Renton (City) is proposing a Taxiway A and Associated Improvements project (project) at the Renton Municipal Airport (Airport) in Renton, Washington (Figure 1). The Airport is adjacent to Lake Washington to the north and the Cedar River to the east. Both are considered to be Shorelines of the State with Shoreline Environmental Designations of High Intensity. The project is a maintenance project; therefore, the City is applying for a Shoreline Permit Exemption. As part of the application, the Renton Municipal Code (RMC) requires a Standard Lake Study and a Habitat Data Report to document existing conditions and describe measures to be taken to protect shoreline resources. Environmental Science Associates (ESA) was contracted by the Airport to prepare this Lake Study and Habitat Data Report to provide a description of the environmental and habitat attributes in the project area, as well as ecological functions that may be impacted by the project. Portions of the project will occur within the 200-foot shoreline jurisdiction of Lake Washington, which is the focus of this report. However, all work will be outside of the 200-foot shoreline jurisdiction of the Cedar River (Figure 2). Therefore, the Cedar River is not included in this assessment. 2.0 Project Description The project includes rehabilitation and associated improvements along Taxiway A, taxiway connectors A1– A7, Apron Service Road, and the Seaplane Ramp. The project also includes removal and replacement of an underground fire waterline running north-south along Taxiway A and drainage improvements to the infield. The project will be constructed in two phases. Phase 1 consists of the rehabilitation work starting at the north end of Taxiway A (A1 connector to runway) and extending south to just north of Taxiway A6 and will be constructed spring–fall 2025. Phase 2 consists of rehabilitation work on Taxiway A from Taxiway A6 to Taxiway A7 and will be constructed spring–fall 2026 (Appendix A). The project will include the following elements: •Rehabilitation of the existing Taxiway A, A1, A2, A3, A4, A5, A6, and A7 pavements. •Rehabilitation of the existing apron service road pavement to the west of Taxiway A. •Rehabilitation of the existing Seaplane Ramp pavement to the north of Taxiway A. • WilliamsStreet NorthLoganAvenue North Renton Avenue South Airport Way SouthRainierAvenue NorthNorth 8th Street North 6th Street North 4th StreetNortheast ParkDr iveNorth3 rd StreetRainier AvenueSouth2020 40 40 40202 2 2224 22 22 242222 24 22242424 22 222424 222 2 2422 24 2 4 2235032530010075275 250 225 5020017515012537525Figure 1 Project Vicinity and 100-Year Floodplain FEMA 2024, Washington DNR 2023, OSM 2024, King Co 2021 0 400 Feet 0 200 Meters U:\GIS\GIS\Projects\2023xxx\D202300538_Renton_Airport_Taxiway_A\03_Project\202300538_3_RentonAirportTaxiwayA.aprx (SMarion, 4/25/2024)Renton Municipal Airport property FEMA Flood Zone Regulatory Floodway 1% Annual Chance of Flood Taxiway A Rehabilitation and Associated Improvements Project Area LAKE WASHINGTON Type S Water Type S WaterCEDAR RIVER SEAPLANE RAMP SITE ACCESS VEGETATED RIPARIAN AREA IN PROJECT VICINITY (DOMINATED BY INVASIVE SPECIES) Figure 2: Waters and Shoreline Jurisdiction within Project Vicinity FEMA 2024, Washington DNR 2023, OSM 2024, King Co 2021 0 100 Feet 0 50 Meters U:\GIS\GIS\Projects\2023xxx\D202300538_Renton_Airport_Taxiway_A\03_Project\202300538_3_RentonAirportTaxiwayA.aprx (SMarion, 4/25/2024)Renton Municipal Airport property Approximate OHWM Shoreline Jurisdiction Taxiway A Rehabilitation and Associated Improvements Project Area LAKE WASHINGTON Type S Water Type S WaterCEDAR RIVER 3.0 Local Regulations Renton Municipal Airport Taxiway A Rehabilitation 4 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report •Replacement of existing Taxiway A edge lighting with new light-emitting diode (LED) lights. •Removal/abandonment of the existing fire water line beneath Taxiway A that is leaking and beyond its useful life. •Minor infield grading and drainage improvements between Taxiway A and Runway 16/34. •Replacement/relocation of existing taxiway signage to support taxiway and infield improvements. All work will occur within the built environment, and there will be no increase in impervious surface area. Rehabilitation of roads and taxiways will include the replacement of existing asphalt pavement, which is failing, with engineered structural pavement section materials (e.g., asphalt, crushed aggregate, concrete). Work will only occur to existing native subgrade. No excavation below the depth of the existing pavement section will occur. 3.0 Local Regulations Under the RMC 4-8-120C (Submittal Requirements – Specific to Application Type: Land Use Applications), the City requires the following environmental reports to be included with the Airport’s permit application submittal for the project: Stream or Lake Study, Standard: A report shall be prepared by a qualified biologist and include the following information: a.Site Map: Site map(s) indicating, at a scale no smaller than one inch equals twenty feet (1” = 20’) (unless otherwise approved by the Community and Economic Development Administrator): i.The entire parcel of land owned by the applicant, including one hundred feet (100’) of the abutting parcels through which the water body(ies) flow(s); ii.The ordinary high water mark (OHWM) determined in the field by a qualified consultant pursuant to RMC 4-3-050G7, Streams and Lakes, (the OHWM must also be flagged in the field); iii.Stream or lake classification, as recorded in the City of Renton’s COR Maps, the City’s online interactive mapping application available through the City’s website, for the City of Renton Water Class or RMC 4-3-090 (if unclassified, see “Supplemental Stream or Lake Study” below); iv.Topography of the site and abutting lands in relation to the stream(s) and its/their buffer(s) at contour intervals of two feet (2’) where slopes are less than ten percent (10%), and of five feet (5’) where slopes are ten percent (10%) or greater; v.One hundred (100) year floodplain and floodway boundaries, including one hundred feet (100’) of the abutting parcels through which the water body(ies) flow(s); vi.Site drainage patterns, using arrows to indicate the direction of major drainage flow; vii.Top view and typical cross-section views of the stream or lake bed, banks, and buffers to scale; viii. The vegetative cover of the entire site, including the stream or lake, banks, riparian area, and/or abutting wetland areas, extending one hundred feet (100’) upstream and downstream from the property line. Include position, species, and size of all trees of at least six-inch (6”) caliper and larger, fifty four inches (54”) above grade, and the location, size and species of all protected trees on the site that are within one hundred feet (100’) of the OHWM, and the location of measures to protect trees on and abutting the site; 3.0 Local Regulations Renton Municipal Airport Taxiway A Rehabilitation 5 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report ix. The location, width, depth, and length of all existing and proposed structures, roads, stormwater management facilities, wastewater treatment and installations in relation to the stream/lake and its/their buffer(s); and x. Location of site access, ingress and egress. b. Grading Plan: A grading plan prepared in accordance with RMC 4-8-120D7, and showing contour intervals of two feet (2’) where slopes are less than ten percent (10%), and of five feet (5’) where slopes are ten percent (10%) or greater. c. Stream or Lake Assessment Narrative: A narrative report, formatted to eight and one- half inches (8.5") by eleven-inches (11") shall be prepared to accompany the site plan and describes: i. The stream or lake classification as recorded in the City of Renton’s COR Maps, the City’s online interactive mapping application available through the City’s website, for the City of Renton Water Class or RMC 4-3-090; ii. The vegetative cover of the site, including the stream or lake, banks, riparian area, wetland areas, and flood hazard areas extending one hundred feet (100’) upstream and downstream from the property line, including the impacts of the proposal on the identified vegetation; iii. The ecological functions currently provided by the stream/lake and existing riparian area and the impacts of the proposal on the identified ecological functions; iv. Observed or reported fish and wildlife that make use of the area including, but not limited to, salmonids, mammals, and bird nesting, breeding, and feeding/foraging areas, including the impacts of the proposal on the identified fish and wildlife; v. Measures to protect trees, as defined in RMC 4-11-200, and vegetation; and vi. For shorelines regulated under RMC 4-3-090, Shoreline Master Program Regulations, the study shall demonstrate if the proposal meets the criteria of no net loss of ecological functions as described in RMC 4-3-090D2. If the proposal requires mitigation for substantial impacts to the existing vegetation buffer in order to demonstrate no net loss of ecological functions, a supplemental stream or lake study is required. (Ord. 5137, 4-25-2005; Ord. 5633, 10-24-2011; Ord. 5676, 12-3-2012; Ord. 5757, 6-1-2015). Habitat Data Report: Habitat data reports include: d. Site Plan: The site plan shall indicate: • The vegetative cover types reflecting the general boundaries of the different plant communities on the site; • The exact locations and specifications for all activities associated with site development including the type, extent and method of operations; • Top view and typical cross-section views of critical habitat/wildlife habitat to scale; • The results of searches of the State Department of Fish and Wildlife’s Natural Heritage and Non- Game Data System databases; • The results of searches of the Washington State Department of Fish and Wildlife Priority Habitat and Species database. 4.0 Standard Lake Study Narrative Renton Municipal Airport Taxiway A Rehabilitation 6 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report e.Narrative Report: A narrative report shall be prepared to accompany the site plan which describes: •The layers, diversity and variety of habitat found on the site; •The location of any migration or movement corridors; •The species typically associated with the cover types, including an identification of any critical wildlife species that might be expected to be found; •Identification of any areas that have been previously disturbed or degraded by human activity or natural processes; •A summary of existing habitat functions and values, utilizing a habitat evaluation procedure or methodology approved by the City; •A summary of proposed habitat alterations and impacts and proposed habitat management program. Potential impacts may include but are not limited to clearing of vegetation, fragmentation of wildlife habitat, expected decrease in species diversity or quantity, changes in water quality, increases in human intrusion, and impacts on wetlands or other water resources (Ord. 4835, 3-27-2000). Sections 4.0 and 5.0 of this report provide the narratives for the Standard Lake Study and Habitat Data Report, respectively. 4.0 Standard Lake Study Narrative This section presents the Standard Lake Study narrative, providing information about existing habitat conditions and functions of Lake Washington adjacent to the project area. The project area is defined as those areas of proposed improvements detailed in Section 2.0 within the 200-foot shoreline zone adjacent to Lake Washington (see Figure 1). 4.1 Stream and Lake Classification Lake Washington is classified as a Shoreline of Statewide Significance (Type S) per RMC 4-3-090 and is regulated under Renton’s Shoreline Master Program regulations. 4.2 Vegetative Cover ESA biologists Gracie Allen and Jessica Redman conducted a site visit on March 21, 2024, to assess vegetative cover along the Lake Washington shoreline adjacent to and within 200 feet of the project area. Appendix B provides a photographic log depicting habitat conditions and vegetation along the riparian zone of Lake Washington adjacent to the project area. The project area is within the existing built environment of the Airport and consists primarily of paved concrete and asphalt surfaces adjacent to grass infields. West of the Seaplane Ramp within 100 feet of the project area, Lake Washington contains no riparian zone or vegetated shoreline. This area is devoid of any vegetation and is entirely concrete surfaces supporting pedestrian access to seaplane mooring docks (Photos 1, 2, and 3). The riparian zone to the east of the Seaplane Ramp within 100 feet of the project area comprises a relatively narrow (approximately 20-foot-wide or less) vegetated band consisting of shrubs and grass/herbaceous groundcover. This area abuts graded grass infield surfaces to the south and is mixed with fill material and broken concrete (Photos 4 and 5). Vegetation within the riparian zone consists 4.0 Standard Lake Study Narrative Renton Municipal Airport Taxiway A Rehabilitation 7 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report primarily of invasive species including Himalayan blackberry (Rubus armeniacus), reed canarygrass (Phalaris arundinacea), English ivy (Hedera helix), butterfly-bush (Buddleja davidii), and English holly (Ilex sp.) (Photos 6, 7, 8, and 9). Other vegetation associated with this area includes herbaceous weedy groundcover (e.g., clover [Trifolium sp.], plantain [Plantago sp.], dandelion [Taraxacum sp.] species) and grasses. No trees are located on the Lake Washington shoreline within 100 feet of the project area. 4.3 Ecological Function Lake Washington is a naturally occurring ribbon lake excavated by glaciers near the end of the Late Pleistocene. It is surrounded by cities, most notably Seattle, Kenmore, Kirkland, Bellevue, and Renton. Prior to development, the project area existed as a floodplain for the Cedar River and Black River at the southern extent of the lake. Historically, Lake Washington drained to the south through the Black River. Prior to 1916, Lake Washington extended approximately as far south as the current Taxiway A5 (GeoSciences Inc. 2023). Here the lake flowed into the mouth of the Black River, which continued to flow south until it met the Cedar River at approximately what is now the southern end of Taxiway A. In 1916, a canal was completed that connected Lake Washington and Portage Bay (Lake Union), resulting in the lowering of Lake Washington water levels by approximately 9 feet (City of Seattle 2024). The levels of both Lake Washington and Lake Union would become controlled by the Hiram M. Chittenden Locks, also known as the Ballard Locks. During the same period of land modification, the Cedar River was rerouted to flow into Lake Washington to prevent flooding in the City of Renton. This activity severed Lake Washington’s outflow to the Black River, as well as the Cedar River’s flow into the Black River. As the Black River dried, fill soils were placed in the historic river channel, nearby wetlands, and the local floodplain to create usable land for development (GeoSciences Inc. 2023). Because of the extensive development and disturbance of the riparian zone along Lake Washington adjacent to and within 100 feet of the project area, the primary ecological functions now provided are minimal. Primary ecological functions provided by the limited riparian vegetation along Lake Washington within 100 feet of the project area include: •Limited nesting and foraging habitat for birds and small mammals. •Input of terrestrial insects from overhanging vegetation. •Input of allochthonous organic matter (via leaf fall). •Limited erosion control. •Limited habitat complexity. 4.4 Fish and Wildlife This section addresses fish and wildlife species that were observed during the site visit or expected to use Lake Washington and/or its riparian zone in the vicinity of the project area. 4.4.1 Mammals No mammals were observed directly during the site visit. However, small excavations, likely made by squirrels (Sciurus spp.), were observed. Given the level of development and paved surface area in the project area, it is likely that only small mammals adapted to disturbed and developed environments such 4.0 Standard Lake Study Narrative Renton Municipal Airport Taxiway A Rehabilitation 8 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report as mice (Peromyscus spp.), rats (Rattus spp.), voles (Microtus spp.), moles (Scapanus orarius), raccoons (Procyon lotor), opossums (Didelphis virginiana), and muskrats (Ondatra zibethicus) use the riparian areas along Lake Washington’s shoreline adjacent to and within 100 feet of the project area. Nutria (Myocastor coypus), an invasive semi-aquatic rodent, is known to inhabit Lake Washington in the vicinity of the project area (WSLPA 2011). 4.4.2 Birds Twenty different bird species were observed during the site visit, mostly waterfowl species including mallard (Anas platyrhynchos), bufflehead (Bucephala albeola), Canada goose (Branta canadensis), and common merganser (Mergus merganser). Bald eagle (Haliaeetus leucocephalus), a species protected by the Bald and Golden Eagle Protection Act (BGEPA), was also observed during the site visit. Documented observations by birders in eBird (an online database of bird observations maintained by the Cornell Lab of Ornithology) report 187 bird species in the project vicinity (eBird 2024). Most of these birds are common to the Puget lowlands and are expected to forage or nest in the project vicinity. 4.4.3 Amphibians and Reptiles No amphibians or reptiles were observed during the site visit; however, it is likely that amphibian (e.g., frogs, salamanders, newts, and toads) and reptile species (e.g., turtles and garter snakes [Thamnophis spp.]) found in the Lake Washington basin may use the areas within the project vicinity. 4.4.4 Fish No fish were observed in Lake Washington adjacent to the project area during the site visit. The Lake Washington system, including the Cedar River adjacent to the project area, hosts many fish species, including five salmonid species: Chinook salmon (Oncorhynchus tshawytscha), coho salmon (O. kisutch), sockeye/kokanee salmon (O. nerka), coastal cutthroat trout (O. clarkii), and steelhead/rainbow trout (O. mykiss) (NWIFC 2024). Additionally, Lake Washington is mapped as designated Critical Habitat for coastal/Puget Sound bull trout/Dolly Varden (Salvelinus confluentus/S. malma). However, it is likely that few bull trout currently occur in the lake, if they occur at all, due to the amount of previous and existing anthropogenic disturbance (USFWS 2024; WDFW 2024a). Puget Sound Chinook salmon, Puget Sound steelhead, and bull trout are federally listed species under the Endangered Species Act. Fish species native to the Lake Washington system include the northern pike minnow (Ptychocheilus oregonensis), peamouth (Mylocheilus caurinus), sculpins (Cottus spp.), and longfin smelt (Spirinchus thaleichthys) (Weitkamp et al., 2000; Wydoski and Whitney, 2003). Several non-native fish species have been documented in the Lake Washington/ Lake Union system. Some of these species are known to prey on salmon (e.g., northern pike [Esox lucius]) while others are potential competitors with juvenile salmonids for food (Kerwin 2001; WDFW 2024b). 4.5 Measures to Protect Trees and Vegetation The project will be confined entirely to the Airport property within the existing built environment and will not occur in areas with existing trees or riparian vegetation. No direct or indirect impacts on riparian vegetation or trees will occur as a result of the project; therefore, no measures to protect vegetation or trees have been incorporated into the project design. 5.0 Habitat Data Narrative Renton Municipal Airport Taxiway A Rehabilitation 9 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report 4.6 No Net Loss of Ecological Function Because the project will occur entirely within the built environment, the project will result in no net loss of ecological function in the riparian zone of Lake Washington adjacent to and within 100 feet of the project area. There will be no change in the area of impervious surfaces within the shoreline zone. The ecological function provided by the site is expected to be the same pre- and post-construction. 5.0 Habitat Data Narrative This section presents the Habitat Data Report narrative, providing information about existing habitat conditions and functions of Lake Washington adjacent to the project area. For the Habitat Data Report narrative, the project area is defined as the areas of proposed improvements detailed in Section 2.0 within the 200-foot shoreline zone adjacent to Lake Washington. 5.1 Habitat Diversity As described in Section 4.3 of this report, the shoreline of Lake Washington in the vicinity of the project area has been heavily altered by development. Because of the extensive development along the shoreline of Lake Washington in the project area, there is minimal habitat diversity. The only upland wildlife habitat present within this area consists of limited herbaceous groundcover and a narrow width (less than 20 feet wide) of woody vegetation and shrubs to the east of the Seaplane Ramp (Appendix B, Photos 1, 9, and 12). Aquatic wildlife habitat consists of limited large woody debris that abuts the riparian zone to the east of the Seaplane Ramp (Appendix B, Photos 10 and 11). The remainder of the area is primarily asphalt and concrete surfaces with small, isolated patches of mowed grass infields that do not support wildlife habitat. 5.2 Migration Corridors According to the Washington Department of Fish and Wildlife (WDFW) Priority Habitats and Species (PHS) program, no mammalian migration corridors exist within the vicinity of the project area. Lake Washington is known to host several salmonid species that migrate through the Ballard Locks to Puget Sound and include: •Steelhead •Sockeye salmon/kokanee •Coastal cutthroat trout •Chinook salmon •Coho salmon •Bull trout/Dolly Varden Puget Sound Chinook salmon, Puget Sound steelhead, and bull trout are federally listed species protected under the Endangered Species Act. Additionally. the project area is located within the Pacific Flyway, a flight path for migratory birds. Numerous species of waterfowl and passerines use Lake Washington and its riparian areas for foraging and/or nesting (eBird 2024). 5.0 Habitat Data Narrative Renton Municipal Airport Taxiway A Rehabilitation 10 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report 5.3 Vegetation Cover Types and Associated Species The absence of riparian vegetation along the western portion of the Lake Washington shoreline adjacent to the project area, the relatively narrow and invasive species-dominated riparian area along the eastern portion, and the highly developed nature of the shoreline within the study area as a whole severely limit habitat availability and use by multiple plant and animal species. The vegetative cover types present within the project area include herbaceous groundcover and woody shrubs (Appendix B, Photo 12). Species that use these cover types typically include animals associated with disturbed environments such as squirrels, rats, mice, moles, small birds, and amphibians. Critical species occurring in the vicinity of the project area include those salmonids and migratory birds identified in Section 4.4. Further, Lake Washington is identified as Critical Habitat for bull trout (USFWS 2024); however, as mentioned in Section 4.4.4. it is highly unlikely that bull trout use the Lake Washington system due to the amount of anthropogenic disturbance that has occurred historically and exists currently. No other critical habitat or plant or animal species of special concern are expected to occur in the vicinity of the project area (WDFW 2023; USFWS 2024; WDNR 2024). 5.4 Disturbed Areas The entire project area is disturbed. It is highly developed and covered in asphalt and/or concrete on top of gravelly fill material. What vegetation does exist is either invasive species along the shoreline or mowed grasses in the infield. The project area has supported airport operations for decades and as described in Section 4.3 has been developed since the early 1900s. 5.5 Existing Habitat Values and Functions ESA biologists Gracie Allen and Jessica Redman performed a visual-based habitat assessment of the riparian zone of Lake Washington on March 21, 2024. Protocols for the visual-based habitat assessment are identified in the U.S. Environmental Protection Agency’s (EPA’s) Rapid Bioassessment Protocols for Use in Wadeable Streams and Rivers (Barbour et al. 1999). Because of the extensive development and disturbance of the riparian zone along Lake Washington, the area adjacent to and within the project area provides only minimal ecological functions. Primary ecological functions provided by the limited riparian vegetation along Lake Washington within the project area include: •Limited nesting and foraging habitat for birds and small mammals. •Input of terrestrial insects from overhanging vegetation. •Input of allochthonous organic matter (via leaf fall). •Limited erosion control. •Limited habitat complexity. The minimal ecological values and functions of the Lake Washington shoreline within the project area were assessed during the habitat assessment and are due primarily to the lack of habitat complexity and sparse riparian vegetation. 5.0 Habitat Data Narrative Renton Municipal Airport Taxiway A Rehabilitation 11 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report 5.6 Proposed Habitat Alterations No alterations to habitat are proposed as part of the Airport project. All project work would occur in the built environment. The project will not involve any in-water components or work below the ordinary high water mark. What minimal habitat and ecological functions that currently exist on-site are expected to remain post-construction. Additionally, the project will not impact state- or federally listed fish or wildlife species, nor will it impact the Pacific Flyway migratory corridor. Temporary disturbance to infield grass areas during construction will be reseeded, post-construction. 6.0 References Renton Municipal Airport Taxiway A Rehabilitation 12 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report 6.0 References Barbour, M.T., J. Gerritsen, B.C. Snyder, and J.B. Stribling. 1999. Rapid Bioassessment Protocols for Use in Streams and Wadeable Rivers. U.S. Environmental Protection Agency, Office of Water, EPA 841-B-99-002, Washington, D.C. City of Seattle. 2024. The Ship Canal, a Brief History. URL: https://www.seattle.gov/cityarchives/exhibits-and-education/online-exhibits/lake-washington-ship- canal/life-on-the- cut#:~:text=The%20canal%27s%20construction%20lowered%20the,locks%20beginning%20in%20A ugust%201911. Accessed: April 2024. eBird. 2024. Cedar River mouth hotspot. URL: https://ebird.org/hotspot/L283821. Accessed: April 2024. GeoSciences Inc. 2023. Geotechnical Report Renton Municipal Airport Taxiway A Reconstruction/Rehabilitation & Associated Improvements – Phase 1 Predesign Renton, Washington. Prepared for Century West Engineering. December 22, 2023. Kerwin, J. 2001. Salmon and Steelhead Habitat Limiting Factors Report for the Cedar-Sammamish Basin (Water Resource Inventory Area 8). Washington Conservation Commission, Olympia. NWIFC (Northwest Indian Fisheries Commission). 2024. Statewide Washington Integrated Fish Distribution (SWIFD) Online Mapper. URL: https://geo.wa.gov/datasets/wdfw::statewide- washington-integrated-fish-distribution/explore?location=47.198187%2C-120.672158%2C7.22. Accessed: April 2024. USFWS (U.S. Fish and Wildlife Service). 2024. Information for Planning and Consultation (IPaC) tool. URL: https://ipac.ecosphere.fws.gov/. Accessed: April 2024. WDFW (Washington Department of Fish and Wildlife). 2023. Priority Habitats and Species (PHS). URL: https://wdfw.wa.gov/species-habitats/at-risk/phs. Accessed: April 2024. WDFW (Washington Department of Fish and Wildlife). 2024a. Bull trout (Salvelinus confluentus). URL: https://wdfw.wa.gov/species-habitats/species/salvelinus-confluentus#locations. Accessed: April 2024. WDFW (Washington Department of Fish and Wildlife). 2024b. Northern pike (Esox lucius). URL: https://wdfw.wa.gov/species-habitats/invasive/esox-lucius. Accessed: April 2024. WDNR (Washington Department of Natural Resources). 2024. Natural Heritage Program. URL: https://www.dnr.wa.gov/NHPdataexplorer. Accessed: April 2024. Weitkamp, D.E., G.T. Ruggerone, L. Sacha, J. Howell, and B. Bachen. 2000. Factors Affecting Chinook Populations – Background Report. City of Seattle, Seattle, Washington. WSLPA (Washington State Lake Protection Association). 2011. More lakeside neighbors: Nutria now found in Washington. URL: https://www.walpa.org/waterline/june-2011/more-lakeside-neighbors- nutria-now-found-in-washington/. Accessed: April 2024. Wydoski, R.S., and R.R. Whitney. 2003. Inland Fishes of Washington. American Fisheries Society, Bethesda, Maryland, and University of Washington Press, Seattle. TOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATSATSATSATSATSATSATSATSATSATSATSATSATSA2+00 3+00 4 + 0 0 5+006+007+008+009+0010+0011+00SCALES ACCORDINGLY.THIS SHEET, ADJUSTIF NOT ONE INCH ON 0" 1"ORIGINAL DRAWING.BAR IS ONE INCH ONVERIFY SCALESAPPRBYNO. DATEREVISIONSSHEET NO.DRAWING NO.DATE: CENTURY WESTE N G I N E E R I N GPUGET SOUND OFFICE22232 17TH AVENUE SESUITE #206PROJECT NO:SCALE:CHECKED BY:DRAWN BY:DESIGNED BY:RENTON MUNICIPAL AIRPORTTAXIWAY A REHABILITATIONAND ASSOCIATED IMPROVEMENTSC:\Centurywest Dropbox\Puget Sound\Projects\RENTON, CITY OF\`Taxiway A Rehabilitation\CAD\_WORKING\EXHIBIT\DWG\ALT 4 COST TAKEOFFS EXHIBIT_R3.dwgPRELIMINARYNOT FOR CONSTRUCTION 425.286.6602 OFFICE BOTHELL, WA 98021RMBX KEYPLAN0SCALE 1" = 408040'NMATCHLINE, SEE SHEET C1.2C1.11SCALE: 1" = 40'PLANNOVEMBER 202335022.008.02AS NOTEDGJRSAWDMYALTERNATIVE 4C1.11 OF 5LEGENDBASE BID ADG II PAVEMENTBASE BID ADG III PAVEMENTTAXIWAY OBJECT FREE AREALEGEND CONT.ADDITIVE A - AIP ELIGIBLE ADG II PAVEMENTADDITIVE B - NON - AIP ELIGIBLE ADG II PAVEMENTTAXIWAY SAFETY AREATOFATSARUNWAY 16-34TAXIWAY ATAXIWAY A7 BOEING APRON BHANGAR 50' TYP.ESTIMATED TOTAL ALTERNATIVE 4 COSTSESTIMATED COSTBASE BID CONSTRUCTION$15,800,000ADDITIVE A CONSTRUCTION (AIP ELIGIBLE)$1,360,000ADDITIVE B CONSTRUCTION (NON - AIP ELIGIBLE)$850,000CONSTRUCTION MANAGEMENT & ADMINISTRATION$2,300,000TOTAL COSTFAA SHARE (90%)SPONSOR SHAREAVAILABLE FAA FUNDING*FAA GRANT BALANCETOTAL AIP ELIGIBLE BASE BID$18,100,000$16,290,000$1,810,000$17,069,000$779,000TOTAL AIP ELIGIBLE (BASE BID + ADDITIVE A)$19,460,000$17,514,000$2,391,000$17,069,000$-445,000TOTAL PROJECT COST (BASE BID + ADDITIVE A + ADDITIVE B)$20,310,000$17,514,000$3,241,000$17,069,000$-445,000*AVAILABLE FAA FUNDING IS COMPRISED OF $10,250,000 OF FY24 AND $6,819,000 OF FY25 FUNDS.** MAY BE CONSIDERED FOR FAA FUNDING IF FAVORABLE BIDS RECEIVED.BASE BID ADG III PAVEMENTBASE BID ADG II PAVEMENTADDITIVE A - AIP ELIGIBLE ADG II PAVEMENTADDITIVE B - NON - AIP ELIGIBLE ADG II PAVEMENTADG II TOFA (62') ADG II TSA (39.5')**1C1.62C1.63C1.62C1.6ALT 4 MAJOR WORK ITEMSPAVEMENT :- Base bid rehabilitation extends 25' west of centerline (edge of taxiway)- Taxiway A, A1, A6 and A7 ADG III Pavement (Strength and Width)- Connectors A2, A3, A4 and A5 ADG II Pavement- Taxiway A7 TDG3 fillet design standard (within existing pavement limits)- Taxiway A6, A5, A4, A3, A2, and A1 maintain existing pavement geometry- Maintain existing shed section- AIP eligible work extends to TOFA- Non - AIP eligible work west of TOFASTORM:- Trench drain not anticipated- Provide permit related storm drainage improvements- Provide miscellaneous catch basin & conveyance improvements to facilitate infield drainageWATERLINE:- Abandon waterline in place except for under A, A6 and A7ELECTRICAL:- New LED taxiway edge lights (mix of new and existing base can)- New guidance signs and bases at A1, A6 and A7- 1 regulator for Taxiway A and B circuit (combined)MAINTAIN EXISTINGEDGE GEOMETRYMAINTAIN EXISTINGEDGE GEOMETRY TOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSA1+0 0 2+0 0 3+0 0 4+0 0 5+0 0 12+0013+0014+0015+0016+0017+0018+0019+0020+0021+0022+0023+00SCALES ACCORDINGLY.THIS SHEET, ADJUSTIF NOT ONE INCH ON 0" 1"ORIGINAL DRAWING.BAR IS ONE INCH ONVERIFY SCALESAPPRBYNO. DATEREVISIONSSHEET NO.DRAWING NO.DATE: CENTURY WESTE N G I N E E R I N GPUGET SOUND OFFICE22232 17TH AVENUE SESUITE #206PROJECT NO:SCALE:CHECKED BY:DRAWN BY:DESIGNED BY:RENTON MUNICIPAL AIRPORTTAXIWAY A REHABILITATIONAND ASSOCIATED IMPROVEMENTSC:\Centurywest Dropbox\Puget Sound\Projects\RENTON, CITY OF\`Taxiway A Rehabilitation\CAD\_WORKING\EXHIBIT\DWG\ALT 4 COST TAKEOFFS EXHIBIT_R3.dwgPRELIMINARYNOT FOR CONSTRUCTION 425.286.6602 OFFICE BOTHELL, WA 98021RMBX KEYPLAN0SCALE 1" = 408040'NMATCHLINE, SEE SHEET C1.3 MATCHLINE, SEE SHEET C1.1 NOVEMBER 202335022.008.02AS NOTEDGJRSAWDMYALTERNATIVE 4C1.22 OF 5C1.21SCALE: 1" = 40'PLANLEGENDBASE BID ADG II PAVEMENTBASE BID ADG III PAVEMENTTAXIWAY OBJECT FREE AREALEGEND CONT.ADDITIVE A - AIP ELIGIBLE ADG II PAVEMENTADDITIVE B - NON - AIP ELIGIBLE ADG II PAVEMENTTAXIWAY SAFETY AREATOFATSARUNWAY 16-34TAXIWAY ATAX I W A Y A 6 BOEING APRON BHANGARFBO FUEL TANKSHANGAR HANGAR HANGAR50' TYP.MAINTAIN EXISTING EDGE GEOMETRYMAINTAIN EXISTING EDGE GEOMETRYBASE BID ADG III PAVEMENTADDITIVE A - AIP ELIGIBLE ADG II PAVEMENTADDITIVE B - NON - AIP ELIGIBLE ADG II PAVEMENTADG II TOFA (62') ADG II TSA (39.5')**1C1.62C1.62C1.6ALT 4 MAJOR WORK ITEMSPAVEMENT :- Base bid rehabilitation extends 25' west of centerline (edge of taxiway)- Taxiway A, A1, A6 and A7 ADG III Pavement (Strength and Width)- Connectors A2, A3, A4 and A5 ADG II Pavement- Taxiway A7 TDG3 fillet design standard (within existing pavement limits)- Taxiway A6, A5, A4, A3, A2, and A1 maintain existing pavement geometry- Maintain existing shed section- AIP eligible work extends to TOFA- Non - AIP eligible work west of TOFASTORM:- Trench drain not anticipated- Provide permit related storm drainage improvements- Provide miscellaneous catch basin & conveyance improvements to facilitate infield drainageWATERLINE:- Abandon waterline in place except for under A, A6 and A7ELECTRICAL:- New LED taxiway edge lights (mix of new and existing base can)- New guidance signs and bases at A1, A6 and A7- 1 regulator for Taxiway A and B circuit (combined)ESTIMATED TOTAL ALTERNATIVE 4 COSTSESTIMATED COSTBASE BID CONSTRUCTION$15,800,000ADDITIVE A CONSTRUCTION (AIP ELIGIBLE)$1,360,000ADDITIVE B CONSTRUCTION (NON - AIP ELIGIBLE)$850,000CONSTRUCTION MANAGEMENT & ADMINISTRATION$2,300,000TOTAL COSTFAA SHARE (90%)SPONSOR SHAREAVAILABLE FAA FUNDING*FAA GRANT BALANCETOTAL AIP ELIGIBLE BASE BID$18,100,000$16,290,000$1,810,000$17,069,000$779,000TOTAL AIP ELIGIBLE (BASE BID + ADDITIVE A)$19,460,000$17,514,000$2,391,000$17,069,000$-445,000TOTAL PROJECT COST (BASE BID + ADDITIVE A + ADDITIVE B)$20,310,000$17,514,000$3,241,000$17,069,000$-445,000*AVAILABLE FAA FUNDING IS COMPRISED OF $10,250,000 OF FY24 AND $6,819,000 OF FY25 FUNDS.** MAY BE CONSIDERED FOR FAA FUNDING IF FAVORABLE BIDS RECEIVED. TOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSA1+002+003+004+00 0+001+002+003+004+005+0024+0025+0026+0027+0028+0029+0030+0031+0032+0033+0034+0035+00SCALES ACCORDINGLY.THIS SHEET, ADJUSTIF NOT ONE INCH ON 0" 1"ORIGINAL DRAWING.BAR IS ONE INCH ONVERIFY SCALESAPPRBYNO. DATEREVISIONSSHEET NO.DRAWING NO.DATE: CENTURY WESTE N G I N E E R I N GPUGET SOUND OFFICE22232 17TH AVENUE SESUITE #206PROJECT NO:SCALE:CHECKED BY:DRAWN BY:DESIGNED BY:RENTON MUNICIPAL AIRPORTTAXIWAY A REHABILITATIONAND ASSOCIATED IMPROVEMENTSC:\Centurywest Dropbox\Puget Sound\Projects\RENTON, CITY OF\`Taxiway A Rehabilitation\CAD\_WORKING\EXHIBIT\DWG\ALT 4 COST TAKEOFFS EXHIBIT_R3.dwgPRELIMINARYNOT FOR CONSTRUCTION 425.286.6602 OFFICE BOTHELL, WA 98021RMBX KEYPLAN0SCALE 1" = 408040'NMATCHLINE, SEE SHEET C1.2 MATCHLINE, SEE SHEET C1.4NOVEMBER 202335022.008.02AS NOTEDGJRSAWDMYALTERNATIVE 4C1.33 OF 5C1.31SCALE: 1" = 40'PLANLEGENDBASE BID ADG II PAVEMENTBASE BID ADG III PAVEMENTTAXIWAY OBJECT FREE AREALEGEND CONT.ADDITIVE A - AIP ELIGIBLE ADG II PAVEMENTADDITIVE B - NON - AIP ELIGIBLE ADG II PAVEMENTTAXIWAY SAFETY AREATOFATSARUNWAY 16-34TAXIWAY A5TAXIWAY ATAXIWAY A4 ATCTBOEING FUEL FARMHANGARHANGAR50' TYP.MAINTAIN EXISTING EDGEGEOMETRYMAINTAIN EXISTING EDGEGEOMETRYBASE BID ADG III PAVEMENTBASE BID ADG II PAVEMENTADDITIVE A - AIP ELIGIBLE ADG II PAVEMENTADDITIVE B - NON - AIP ELIGIBLE ADG II PAVEMENTBASE BID ADG II PAVEMENTADG II TSA (39.5') ADG II TOFA (62')**ALT 4 MAJOR WORK ITEMSPAVEMENT :- Base bid rehabilitation extends 25' west of centerline (edge of taxiway)- Taxiway A, A1, A6 and A7 ADG III Pavement (Strength and Width)- Connectors A2, A3, A4 and A5 ADG II Pavement- Taxiway A7 TDG3 fillet design standard (within existing pavement limits)- Taxiway A6, A5, A4, A3, A2, and A1 maintain existing pavement geometry- Maintain existing shed section- AIP eligible work extends to TOFA- Non - AIP eligible work west of TOFASTORM:- Trench drain not anticipated- Provide permit related storm drainage improvements- Provide miscellaneous catch basin & conveyance improvements to facilitate infield drainageWATERLINE:- Abandon waterline in place except for under A, A6 and A7ELECTRICAL:- New LED taxiway edge lights (mix of new and existing base can)- New guidance signs and bases at A1, A6 and A7- 1 regulator for Taxiway A and B circuit (combined)1C1.62C1.63C1.62C1.63C1.6ESTIMATED TOTAL ALTERNATIVE 4 COSTSESTIMATED COSTBASE BID CONSTRUCTION$15,800,000ADDITIVE A CONSTRUCTION (AIP ELIGIBLE)$1,360,000ADDITIVE B CONSTRUCTION (NON - AIP ELIGIBLE)$850,000CONSTRUCTION MANAGEMENT & ADMINISTRATION$2,300,000TOTAL COSTFAA SHARE (90%)SPONSOR SHAREAVAILABLE FAA FUNDING*FAA GRANT BALANCETOTAL AIP ELIGIBLE BASE BID$18,100,000$16,290,000$1,810,000$17,069,000$779,000TOTAL AIP ELIGIBLE (BASE BID + ADDITIVE A)$19,460,000$17,514,000$2,391,000$17,069,000$-445,000TOTAL PROJECT COST (BASE BID + ADDITIVE A + ADDITIVE B)$20,310,000$17,514,000$3,241,000$17,069,000$-445,000*AVAILABLE FAA FUNDING IS COMPRISED OF $10,250,000 OF FY24 AND $6,819,000 OF FY25 FUNDS.** MAY BE CONSIDERED FOR FAA FUNDING IF FAVORABLE BIDS RECEIVED. TOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSATSA1+002+003+004+005+0036+0037+0038+0039+0040+0041+0042+0043+0044+0045+0046+0047+00SCALES ACCORDINGLY.THIS SHEET, ADJUSTIF NOT ONE INCH ON 0" 1"ORIGINAL DRAWING.BAR IS ONE INCH ONVERIFY SCALESAPPRBYNO. DATEREVISIONSSHEET NO.DRAWING NO.DATE: CENTURY WESTE N G I N E E R I N GPUGET SOUND OFFICE22232 17TH AVENUE SESUITE #206PROJECT NO:SCALE:CHECKED BY:DRAWN BY:DESIGNED BY:RENTON MUNICIPAL AIRPORTTAXIWAY A REHABILITATIONAND ASSOCIATED IMPROVEMENTSC:\Centurywest Dropbox\Puget Sound\Projects\RENTON, CITY OF\`Taxiway A Rehabilitation\CAD\_WORKING\EXHIBIT\DWG\ALT 4 COST TAKEOFFS EXHIBIT_R3.dwgPRELIMINARYNOT FOR CONSTRUCTION 425.286.6602 OFFICE BOTHELL, WA 98021RMBX KEYPLAN0SCALE 1" = 408040'NMATCHLINE, SEE SHEET C1.3 MATCHLINE, SEE SHEET C1.5NOVEMBER 202335022.008.02AS NOTEDGJRSAWDMYALTERNATIVE 4C1.44 OF 5C1.41SCALE: 1" = 40'PLANLEGENDBASE BID ADG II PAVEMENTBASE BID ADG III PAVEMENTTAXIWAY OBJECT FREE AREALEGEND CONT.ADDITIVE A - AIP ELIGIBLE ADG II PAVEMENTADDITIVE B - NON - AIP ELIGIBLE ADG II PAVEMENTTAXIWAY SAFETY AREATOFATSARUNWAY 16-34TAXIWAY ATAXIWAY A3BOEING APRON CGA TIEDOWN APRONGA TIEDOWN APRON50' TYP.MAINTAIN EXISTING EDGEGEOMETRYBASE BID ADG III PAVEMENTBASE BID ADG II PAVEMENTADDITIVE A - AIP ELIGIBLE ADG II PAVEMENTADDITIVE B - NON - AIP ELIGIBLE ADG II PAVEMENTADG II TSA (39.5') ADG II TOFA (62')**1C1.62C1.63C1.62C1.6ALT 4 MAJOR WORK ITEMSPAVEMENT :- Base bid rehabilitation extends 25' west of centerline (edge of taxiway)- Taxiway A, A1, A6 and A7 ADG III Pavement (Strength and Width)- Connectors A2, A3, A4 and A5 ADG II Pavement- Taxiway A7 TDG3 fillet design standard (within existing pavement limits)- Taxiway A6, A5, A4, A3, A2, and A1 maintain existing pavement geometry- Maintain existing shed section- AIP eligible work extends to TOFA- Non - AIP eligible work west of TOFASTORM:- Trench drain not anticipated- Provide permit related storm drainage improvements- Provide miscellaneous catch basin & conveyance improvements to facilitate infield drainageWATERLINE:- Abandon waterline in place except for under A, A6 and A7ELECTRICAL:- New LED taxiway edge lights (mix of new and existing base can)- New guidance signs and bases at A1, A6 and A7- 1 regulator for Taxiway A and B circuit (combined)ESTIMATED TOTAL ALTERNATIVE 4 COSTSESTIMATED COSTBASE BID CONSTRUCTION$15,800,000ADDITIVE A CONSTRUCTION (AIP ELIGIBLE)$1,360,000ADDITIVE B CONSTRUCTION (NON - AIP ELIGIBLE)$850,000CONSTRUCTION MANAGEMENT & ADMINISTRATION$2,300,000TOTAL COSTFAA SHARE (90%)SPONSOR SHAREAVAILABLE FAA FUNDING*FAA GRANT BALANCETOTAL AIP ELIGIBLE BASE BID$18,100,000$16,290,000$1,810,000$17,069,000$779,000TOTAL AIP ELIGIBLE (BASE BID + ADDITIVE A)$19,460,000$17,514,000$2,391,000$17,069,000$-445,000TOTAL PROJECT COST (BASE BID + ADDITIVE A + ADDITIVE B)$20,310,000$17,514,000$3,241,000$17,069,000$-445,000*AVAILABLE FAA FUNDING IS COMPRISED OF $10,250,000 OF FY24 AND $6,819,000 OF FY25 FUNDS.** MAY BE CONSIDERED FOR FAA FUNDING IF FAVORABLE BIDS RECEIVED. TOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATOFATSATSATSATSATSATSATSATSATSATSATSATSA1+002+003+004+00 48+0049+0050+0051+0052+0053+0054+0055+0056+00SCALES ACCORDINGLY.THIS SHEET, ADJUSTIF NOT ONE INCH ON 0" 1"ORIGINAL DRAWING.BAR IS ONE INCH ONVERIFY SCALESAPPRBYNO. DATEREVISIONSSHEET NO.DRAWING NO.DATE: CENTURY WESTE N G I N E E R I N GPUGET SOUND OFFICE22232 17TH AVENUE SESUITE #206PROJECT NO:SCALE:CHECKED BY:DRAWN BY:DESIGNED BY:RENTON MUNICIPAL AIRPORTTAXIWAY A REHABILITATIONAND ASSOCIATED IMPROVEMENTSC:\Centurywest Dropbox\Puget Sound\Projects\RENTON, CITY OF\`Taxiway A Rehabilitation\CAD\_WORKING\EXHIBIT\DWG\ALT 4 COST TAKEOFFS EXHIBIT_R3.dwgPRELIMINARYNOT FOR CONSTRUCTION 425.286.6602 OFFICE BOTHELL, WA 98021RMBX KEYPLAN0SCALE 1" = 408040'NMATCHLINE, SEE SHEET C1.4 NOVEMBER 202335022.008.02AS NOTEDGJRSAWDMYALTERNATIVE 4C1.55 OF 5LEGENDBASE BID ADG II PAVEMENTBASE BID ADG III PAVEMENTTAXIWAY OBJECT FREE AREALEGEND CONT.ADDITIVE A - AIP ELIGIBLE ADG II PAVEMENTADDITIVE B - NON - AIP ELIGIBLE ADG II PAVEMENTTAXIWAY SAFETY AREATOFATSAC1.51SCALE: 1" = 40'PLANRUNWAY 16-34TAXIWAY ATAXIWAY A2 TAXIWAY A1 LAKEWASHINGTONHANGARHANGAR SEAPLANE APRONMAINTAIN EXISTING EDGEGEOMETRYMAINTAIN EXISTINGEDGE GEOMETRYBASE BID ADG III PAVEMENTBASE BID ADG II PAVEMENTADDITIVE A - AIP ELIGIBLE ADG II PAVEMENTADDITIVE B - NON - AIP ELIGIBLE ADG II PAVEMENTBASE BID ADG II PAVEMENTADG II TSA(39.5')ADG II TOFA(62')**1C1.62C1.63C1.64C1.62C1.6ALT 4 MAJOR WORK ITEMSPAVEMENT :- Base bid rehabilitation extends 25' west of centerline (edge of taxiway)- Taxiway A, A1, A6 and A7 ADG III Pavement (Strength and Width)- Connectors A2, A3, A4 and A5 ADG II Pavement- Taxiway A7 TDG3 fillet design standard (within existing pavement limits)- Taxiway A6, A5, A4, A3, A2, and A1 maintain existing pavement geometry- Maintain existing shed section- AIP eligible work extends to TOFA- Non - AIP eligible work west of TOFASTORM:- Trench drain not anticipated- Provide permit related storm drainage improvements- Provide miscellaneous catch basin & conveyance improvements to facilitate infield drainageWATERLINE:- Abandon waterline in place except for under A, A6 and A7ELECTRICAL:- New LED taxiway edge lights (mix of new and existing base can)- New guidance signs and bases at A1, A6 and A7- 1 regulator for Taxiway A and B circuit (combined)ESTIMATED TOTAL ALTERNATIVE 4 COSTSESTIMATED COSTBASE BID CONSTRUCTION$15,800,000ADDITIVE A CONSTRUCTION (AIP ELIGIBLE)$1,360,000ADDITIVE B CONSTRUCTION (NON - AIP ELIGIBLE)$850,000CONSTRUCTION MANAGEMENT & ADMINISTRATION$2,300,000TOTAL COSTFAA SHARE (90%)SPONSOR SHAREAVAILABLE FAA FUNDING*FAA GRANT BALANCETOTAL AIP ELIGIBLE BASE BID$18,100,000$16,290,000$1,810,000$17,069,000$779,000TOTAL AIP ELIGIBLE (BASE BID + ADDITIVE A)$19,460,000$17,514,000$2,391,000$17,069,000$-445,000TOTAL PROJECT COST (BASE BID + ADDITIVE A + ADDITIVE B)$20,310,000$17,514,000$3,241,000$17,069,000$-445,000*AVAILABLE FAA FUNDING IS COMPRISED OF $10,250,000 OF FY24 AND $6,819,000 OF FY25 FUNDS.** MAY BE CONSIDERED FOR FAA FUNDING IF FAVORABLE BIDS RECEIVED. EXISTING NATIVE SUBGRADETW CENTERLINEVARIESGEOTEXTILE SEPARATION FABRIC6" BITUMINOUS STABILIZEDBASE COURSE (P-403)4" BITUMINOUS SURFACECOURSE (P-401)VARIESTOP OF MILLED SURFACEEXISTING ASPHALT PAVEMENT& PAVEMENT SECTION TOREMAIN, DEPTH VARIES2" MILL AND INLAYVARIESTOP OF MILLED SURFACEEXISTING ASPHALT PAVEMENT& PAVEMENT SECTION TOREMAIN, DEPTH VARIES4" MILL AND INLAYEXISTING NATIVE SUBGRADEVARIESGEOTEXTILE SEPARATION FABRIC6" CRUSHED AGGREGATEBASE COURSE6" PORTLAND CEMENTCONCRETE (PCC)6" ASPHALT18" SUBBASE8" CEMENT TREATED BASECOURSE (P-304)EXISTING NATIVE SUBGRADEVARIESGEOTEXTILE SEPARATION FABRIC6" CRUSHED AGGREGATEBASE COURSE (P209)4" BITUMINOUS SURFACECOURSE (P-401)6" CEMENT TREATED BASECOURSE (P-304)6" CRUSHED AGGREGATEBASE COURSE (P209)12" +/- EXISTING SUBBASE(P209)SCALES ACCORDINGLY.THIS SHEET, ADJUSTIF NOT ONE INCH ON 0" 1"ORIGINAL DRAWING.BAR IS ONE INCH ONVERIFY SCALESAPPRBYNO. DATEREVISIONSSHEET NO.DRAWING NO.DATE: CENTURY WESTE N G I N E E R I N GPUGET SOUND OFFICE22232 17TH AVENUE SESUITE #206PROJECT NO:SCALE:CHECKED BY:DRAWN BY:DESIGNED BY:RENTON MUNICIPAL AIRPORTTAXIWAY A REHABILITATIONAND ASSOCIATED IMPROVEMENTSC:\Centurywest Dropbox\Puget Sound\Projects\RENTON, CITY OF\`Taxiway A Rehabilitation\CAD\_WORKING\EXHIBIT\DWG\ALT 4 COST TAKEOFFS EXHIBIT_R3.dwgPRELIMINARYNOT FOR CONSTRUCTION 425.286.6602 OFFICE BOTHELL, WA 98021RMBX KEYPLANNOVEMBER 202335022.008.02AS NOTEDGJRSAWDMYALTERNATIVE 4C1.55 OF 51C1.6ADG III PAVEMENTNO SCALE2C1.6ADG II 4" MILL AND INLAYNO SCALE3C1.6ADG II 2" MILL AND INLAYNO SCALE4C1.6SEA PLANE RAMP PAVEMENT REHABNO SCALE5C1.6EXISTING PAVEMENTNO SCALE Appendix B. Photo Log Renton Municipal Airport Taxiway A Reconstruction/Rehabilitation B-1 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report Preliminary − Subject to Revision Photo: 1 Looking: East Notes: Seaplane Ramp: Existing Impervious Surfaces; No Vegetated Shoreline Photo: 2 Looking: West Notes: Existing Impervious Surfaces; No Vegetated Shoreline Appendix B. Photo Log Renton Municipal Airport Taxiway A Reconstruction/Rehabilitation B-2 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report Preliminary − Subject to Revision Photo: 3 Looking: West Notes: Lake Washington Abutting Concrete Wall; No Vegetated Shoreline Photo: 4 Looking: North Notes: Broken Concrete Along Lake Washington Shoreline Appendix B. Photo Log Renton Municipal Airport Taxiway A Reconstruction/Rehabilitation B-3 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report Preliminary − Subject to Revision Photo: 5 Looking: East Notes: Graded Area with Concrete Pieces Photo: 6 Looking: West Notes: Blackberry, Reed Canarygrass, and English Ivy Along Shoreline Appendix B. Photo Log Renton Municipal Airport Taxiway A Reconstruction/Rehabilitation B-4 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report Preliminary − Subject to Revision Photo: 7 Looking: North (downward) Notes: Blackberry Along Shoreline; Woody Debris Photo: 8 Looking: North (downward) Notes: English Ivy, Holly, and Reed Canarygrass Along Shoreline Appendix B. Photo Log Renton Municipal Airport Taxiway A Reconstruction/Rehabilitation B-5 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report Preliminary − Subject to Revision Photo: 9 Looking: West Notes: Riparian Area Along Shoreline Photo: 10 Looking: North Notes: Large Woody Debris Appendix B. Photo Log Renton Municipal Airport Taxiway A Reconstruction/Rehabilitation B-6 ESA / D202300538 and Associated Improvements Project April 2024 Lake Study and Habitat Data Report Preliminary − Subject to Revision Photo: 11 Looking: North (downward) Notes: Large Woody Debris Photo: 12 Looking: East Notes: Vegetation Cover Types