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SEPA Environmental checklist September 2023 Page 1
(WAC 197-11-960)
SEPA1 Environmental Checklist
Purpose of checklist
Governmental agencies use this checklist to help determine whether the environmental impacts of your
proposal are significant. This information is also helpful to determine if available avoidance, minimization, or
compensatory mitigation measures will address the prob able significant impacts or if an environmental impact
statement will be prepared to further analyze the proposal.
Instructions for applicants
This environmental checklist asks you to describe some basic information about your proposal. Please answer
each question accurately and carefully, to the best of your knowledge. You may need to consult with an
agency specialist or private consultant for some questions. You may use “not applicable” or “does not apply”
only when you can explain why it does not apply and not when the answer is unknown. You may also attach
or incorporate by reference additional studies reports. Complete and accurate answers to these questions
often avoid delays with the SEPA process as well as later in the decision-making process.
The checklist questions apply to all parts of your proposal, even if you plan to do them over a period of time
or on different parcels of land. Attach any additional information that will help describe your proposal or its
environmental effects. The agency to which you submit this checklist may ask you to explain your answers or
provide additional information reasonably related to determining if there may be significant adverse impact.
Instructions for lead agencies
Please adjust the format of this template as needed. Additional information may be necessary to evaluate the
existing environment, all interrelated aspects of the proposal and an analysis of adverse impacts. The checklist
is considered the first but not necessarily the only source of information needed to make an adequate
threshold determination. Once a threshold determination is made, the lead agency is responsible for the
completeness and accuracy of the checklist and other supporting documents.
Use of checklist for nonproject proposals
For nonproject proposals (such as ordinances, regulations, plans and programs), complete the applicable parts
of sections A and B, plus the Supplemental Sheet for Nonproject Actions (Part D). Please completely answer all
questions that apply and note that the words "project," "applicant," and "property or site" should be read as
"proposal," "proponent," and "affected geographic area," respectively. The lead agency may exclude (for non -
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projects) questions in “Part B: Environmental Elements” that do not contribute meaningfully to the analysis of
the proposal.
A. Background
Find help answering background questions2
1. Name of proposed project, if applicable:
Renton Municipal Airport Taxiway A Rehabilitation and Associated Improvements
2. Name of applicant:
City of Renton (Renton Municipal Airport)
3. Address and phone number of applicant and contact person:
William Adams
616 West Perimeter Road
Unit A
Renton, WA 98057
206-775-6862
4. Date checklist prepared:
April 30, 2024
5. Agency requesting checklist:
City of Renton
6. Proposed timing of schedule (including phasing, if applicable):
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.
7. Do you have any plans for future additions, expansion, or further activity related to or
connected with this proposal? If yes, explain.
None.
8. List any environmental information you know about that has been prepared, or will be
prepared, directly related to this proposal.
• Stream/Lake Study and Habitat Data Report, Renton Municipal Airport Taxiway A
Rehabilitation & Associated Improvements, Renton, Washington (ESA, April 2024)
• Geotechnical Report, Renton Municipal Airport Taxiway A Rehabilitation &
Associated Improvements – Phase 1 Predesign, Renton, Washington (GeoSciences
Inc., 2023)
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• The Federal Aviation Association (FAA) determined the project to be categorically
excluded under FAA Order 1050.1F 5-6.4 because the proposed project is entirely
within the boundaries of prior ground disturbance.
9. Do you know whether applications are pending for governmental approvals of other
proposals directly affecting the property covered by your proposal? If yes, explain.
None.
10. List any government approvals or permits that will be needed for your proposal, if known.
• Washington Department of Ecology, Construction Stormwater General Permit
• City of Renton Grading Permit
• City of Renton State Shoreline Management Act Shoreline Substantial Development
Permit Exemption
• City of Renton Critical Areas Review
11. Give brief, complete description of your proposal, including the proposed uses and the
size of the project and site. There are several questions later in this checklist that ask you
to describe certain aspects of your proposal. You do not need to repeat th ose answers on
this page. (Lead agencies may modify this form to include additional specific information
on project description.)
The Renton Municipal Airport Taxiway A Rehabilitation and Associated Improvements
Project (project) is proposing a variety of onsite maintenance and improvement projects.
Specifically, the proposed 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 sea plane ramp pavement to the north of Taxiway A.
• Replacement of existing Taxiway A edge lighting with new LED lights.
• Removal/abandonment of the existing fire water line beneath Taxiway A that is
leaking and beyond its useful life and reconfiguration of fire waterline feed to Boeing
Fuel Farm building adjacent Perimeter Road.
• Minor infield grading and drainage improvements between Taxiway A and Runway
16/34.
• Replacement/relocation of existing Taxiway signage as needed to support taxiway
and infield improvements.
All work will occur within the built environment and there will be no increase in the area of
impervious surface. 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, cement). Work will only occur to existing native
subgrade. No excavation below the depth of the existing pavement section will occur.
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The Airport is located adjacent to Lake Washington and the Cedar River, both Shorelines of
the State. The proposed improvements are located within Reach J of Lake Washington
which has a Shoreline Environmental Designation of Shoreline High Intensity.
12. Location of the proposal. Give sufficient information for a person to understand the
precise location of your proposed project, including a street address, if any, and section,
township, and range, if known. If a proposal would occur over a range of area, provide the
range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and
topographic map, if reasonably available. While you should submit any plans requi red by
the agency, you are not required to duplicate maps or detailed plans submitted with any
permit applications related to this checklist.
The Renton Municipal Airport is located at 616 W Perimeter Rd in Renton, Washington
(Figure 1). It is located in Sections 7 and 18 of Township 23 North, Range 5 East on King
County Tax Parcels #0723059007 and #0723059096.
B. Environmental Elements
1. Earth
Find help answering earth questions3
a. General description of the site:
The majority of the site consists of impervious surfaces to support aircraft operations
including a single runway (Runway 16/34) accompanied by parallel Taxiway A to the
west and Taxiway B to the east with several connector taxiways. The site is bordered b y
Lake Washington to the north and the Cedar River to the east, both of which have
vegetated shorelines consisting of Himalayan blackberry (Rubus bifrons), reed canary
grass (Phalaris arundinacea), and English ivy (Hedera helix). The site is predominantly
flat and situated approximately 20 to 30 feet above mean sea level, sloping gently
downward north toward Lake Washington. The infield areas between the taxiways and
runway include typical lawn grasses.
The proposed improvements will only occur on Taxiway A, a flat and paved taxiway to
the west of Runway 16/34. This area contains typical lawn grasses to its east and
impervious surfaces used for aircraft parking to its west. The northern extent of Taxiway
A is adjacent to the Lake Washington shoreline and includes some shrub vegetation.
Prior to development, the Project area existed as the southern extent of Lake
Washington and as a flood plain for the Cedar River and Black River (GeoSciences Inc.,
2023).
Circle or highlight one: Flat, rolling, hilly, steep slopes, mountainous, other:
b. What is the steepest slope on the site (approximate percent slope)?
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The steepest slope is the gradual slope leading to Lake Washington at the north end of
the Project area. According to data from King County’s iMap, elevation along the slope
range from 25 feet at the top of the slope and 20 feet at the bottom of the slope;
resulting in an approximately 3% slope.
c. What general types of soils are found on the site (for example, clay, sand, gravel, peat,
muck)? If you know the classification of agricultural soils, specify them, and note any
agricultural land of long-term commercial significance and whether the proposal
results in removing any of these soils.
The National Resource Conservation Service (NRCS) considers the site to be urban land
and does not map any NRCS soils at the. According to the Project’s geotechnical report
(GeoSciences, 2023) “the project site soil is mapped as artificial fill and modified
land…fill soils were placed in the historic river channel, nearby wetlands, and the local
flood plain to create usable land for development.” The fill material at the site is
primarily composed of dense, sandy gravel.
d. Are there surface indications or history of unstable soils in the immediate vicinity? If
so, describe.
City of Renton Maps the entire site as a seismic hazard (COR Maps 2023). An erosion
hazard is mapped to the west of Taxiway A along W Perimeter Rd and Rainier Ave N
(COR Maps, 2023).
e. Describe the purpose, type, total area, and approximate quantities and total affected
area of any filling, excavation, and grading proposed. Indicate source of fill.
The project will rehabilitate 17.7 acres of existing asphalt and include up to 3.1 acres of
infield grading. Within the limits of pavement rehabilitation, excavation will only occur
within the depth of the existing pavement section (no soils will be imported or exported
as part of the pavement rehabilitation project element). Fill material associated with the
pavement rehabilitation will be engineered structural pavement materials (e.g., asphalt,
crushed aggregate) and will be imported from an approved offsite source. Within the
limits of infield grading, the earthwork is estimated to result in 2,659 cubic yards (CY) of
cut and 1,714 CY fill, resulting in approximately 517 CY of excess native material that will
be hauled off-site, to an undetermined site, and disposed of by the contractor.
Additionally, a limited quantity of temporary excavation will occur as part of trenching
related to the electrical replacement and fire waterline project elements. Native
subgrade materials excavated during construction of these project elements will be
temporarily stockpiled and used as backfill once electrical systems are replaced, and the
fire waterline is removed/modified.
f. Could erosion occur because of clearing, construction, or use? If so, generally describe.
No major vegetation clearing is proposed for the Project and soil erosion is not
anticipated to occur as a result of clearing during construction. Soil erosion could occur
as a result of grading during project construction, primarily during precipitation events.
However, appropriate erosion control best management practices (BMPs) will be
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utilized during construction to minimize or eliminate sediment runoff. Additionally,
temporary erosion control (TESC) measures will be implemented and may include, but
not limited to storm inlet protection, silt fencing, stabilized construction entrance, check
dams, straw wattles, and temporary sedimentation storage (e.g. Baker tanks).
g. About what percent of the site will be covered with impervious surfaces after project
construction (for example, asphalt or buildings)?
Currently, approximately 85% of the site is covered with impervious surfaces. There will
be no change in impervious surfaces after Project construction. The existing impervious
surfaces at the site include asphalt taxiways, runway, and aircraft parking aprons;
hangars; and aircraft office buildings.
h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any.
TESC measures will include, but not be limited to, storm inlet protection, silt fencing,
stabilized construction entrances, check dams, straw wattles, and temporary
sedimentation storage (e.g. Baker tanks).
A draft Construction Stormwater Pollution Prevention Plan (SWPPP) will be prepared for
this project prior to construction and will consist of a written narrative using the
Department of Ecology’s template. Additionally, erosion and sediment control (ESC)
plans will be included in the contract documents. It will be the responsibility of the
selected construction contractor to modify and complete the SWPPP based on the
proposed construction approach and designate a Certified Erosion and Sediment
Control Lead (CESCL) to monitor construction stormwater, as well as modify the SWPPP
based on site conditions and construction activities. The contractor’s CESCL will ensure
that site discharges are in accordance with the State of Washington Construction
Stormwater General Permit.
2. Air
Find help answering air questions4
a. What types of emissions to the air would result from the proposal during construction,
operation, and maintenance when the project is completed? If any, generally describe
and give approximate quantities if known.
During construction activities, there may be a small increase in exhaust emissions from
construction vehicles and equipment, and a temporary increase in fugitive dust due to
sediment removal. This increase in exhaust emissions and dust would be localized and
temporary. No emissions to the air would result from the operation or maintenance of
the project.
b. Are there any off-site sources of emissions or odor that may affect your proposal? If
so, generally describe.
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There are no off-site sources of emissions or odors that would affect the project.
c. Proposed measures to reduce or control emissions or other impacts to air, if any:
Measures that could be incorporated during construction to minimize impacts to air
quality include:
• Spray exposed soil and storage areas with water during dry periods.
• Remove particulate matter deposited on paved areas to reduce mud and dust;
sweep and wash streets frequently to reduce emissions.
• Equip construction equipment with appropriate emission controls.
• Comply with the Puget Sound Clean Air Agency (PSCAA) regulations to control
odorous emissions so as to prevent undue interference with nearby uses.
3. Water
Find help answering water questions5
a. Surface:
Find help answering surface water questions6
1. Is there any surface water body on or in the immediate vicinity of the site
(including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)? If
yes, describe type and provide names. If appropriate, state what stream or river it
flows into.
The site is immediately adjacent to Lake Washington to the north and the Cedar
River, which flows into Lake Washington, to the east. Both are shorelines of the
state. According to the Statewide Washington Integrated Fish Distribution (SWIFD)
online mapping, Cedar River is a fish-bearing stream that supports salmonids.
According to the U.S. Fish and Wildlife Service’s (USFWS) National Wetland
Inventory (NWI), no wetlands occur on site. According to the City of Renton’s (COR)
Maps online mapping tool, one stream occurs onsite that flows north into Lake
Washington. However, this stream is piped under the runway.
2. Will the project require any work over, in, or adjacent to (within 200 feet) the
described waters? If yes, please describe and attach available plans.
There will be no work over or in any waters. A portion of the Project will be
constructed adjacent to (within 200 feet) the waters of Lake Washington. Work
proposed within 200 feet of Lake Washington includes reconstruction and
rehabilitation of the existing asphalt within the seaplane ramp and the northern
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extent of Taxiway A and taxiway connector (Taxiway A1). All proposed project work
will occur greater than 200 feet (approximately 250 feet) to the west of the Cedar
River.
3. Estimate the amount of fill and dredge material that would be placed in or
removed from surface water or wetlands and indicate the area of the site that
would be affected. Indicate the source of fill material.
No in-water work will occur as a part of the project. No fill and/or dredge material
will be placed in or removed from wetlands or surface waters.
4. Will the proposal require surface water withdrawals or diversions? Give a general
description, purpose, and approximate quantities if known.
No surface water withdrawals or diversions are required for the proposed project.
5. Does the proposal lie within a 100-year floodplain? If so, note location on the site
plan.
No, the proposal does not lie within a 100-year floodplain. According to Federal
Emergency Management Agency (FEMA) mapping, the Cedar River 100-year
floodplain (1% chance of annual flood) and regulatory floodway is mostly contained
within its leveed channel (Figure 2). No work is proposed in the floodplain or the
floodway.
6. Does the proposal involve any discharges of waste materials to surface waters? If
so, describe the type of waste and anticipated volume of discharge.
The proposed Project will not involve the discharge of any waste materials to surface
waters.
b. Ground:
Find help answering ground water questions7
1. Will groundwater be withdrawn from a well for drinking water or other purposes?
If so, give a general description of the well, proposed uses and approximate
quantities withdrawn from the well. Will water be discharged to groundwater?
Give a general description, purpose, and approximate quantities if known.
No groundwater would be withdrawn for drinking water or other purposes.
2. Describe waste material that will be discharged into the ground from septic tanks
or other sources, if any (domestic sewage; industrial, containing the following
chemicals…; agricultural; etc.). Describe the general size of the system, the number
of such systems, the number of houses to be served (if applicable), or the number
of animals or humans the system(s) are expected to serve.
No waste materials would be discharged into the ground from septic tanks or other
sources.
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c. Water Runoff (including stormwater):
1. Describe the source of runoff (including storm water) and method of collection
and disposal, if any (include quantities, if known). Where will this water flow? Will
this water flow into other waters? If so, describe.
Stormwater will be the main source of runoff. However, a change in the amount of
stormwater runoff, post-construction, is not anticipated as there are no changes in
the area of impervious surfaces proposed by the Project. Drainage improvements
will include installation of pavement underdrains on east side of Taxiway A that tie
into existing drainage facilities. Additionally, the infield area, where there are
frequently numerous areas of standing water present, will be regraded to better
accommodate drainage. Additionally, storm drainage improvements include
repairing cracked stormwater pipes, replacing misaligned pipes, removal of gravel fill
and debris from pipes, and replacing structures with eroded concrete lid/grate lip.
Currently, Taxiway A stormwater surface runoff is captured along the full length of
the runway through depressed infield drains or catch basins. A subgrade regional
culvert that parallels West Perimeter Road receives the conveyed stormwater from
the taxiway and eventually outfalls into Lake Washington. No changes to the existing
flow of stormwater are a part of the Project. Stormwater runoff will be conveyed to
Lake Washington, as it currently is.
2. Could waste materials enter ground or surface waters? If so, generally describe.
No waste materials would be discharged into the ground or surface waters as a
result of the Project.
Does the proposal alter or otherwise affect drainage patterns in the vicinity of the
site? If so, describe.
The proposal will not affect or alter the existing drainage patterns within the vicinity
of the site.
d. Proposed measures to reduce or control surface, ground, and runoff water, and
drainage pattern impacts, if any:
No impacts to surface water, ground water, stormwater runoff, or drainage patterns will
occur as a result of the project; therefore, no mitigation measure s are required.
4. Plants
Find help answering plants questions
a. Check the types of vegetation found on the site:
☐ deciduous tree: alder, maple, aspen, other
☐ evergreen tree: fir, cedar, pine, other
☒ shrubs
☒ grass
☐ pasture
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☐ crop or grain
☐ orchards, vineyards, or other permanent crops.
☐ wet soil plants: cattail, buttercup, bullrush, skunk cabbage, other
☐ water plants: water lily, eelgrass, milfoil, other
☐ other types of vegetation
b. What kind and amount of vegetation will be removed or altered?
Grasses existing along the airport infields will be cleared and grubbed during
construction. All disturbed areas will be reseeded post-construction.
c. List threatened and endangered species known to be on or near the site.
According to the Washington State Department of Natural Resources Washington
Natural Heritage Program mapper, there are no known listed plant species on or near
the Project site (WDNR 2024). The Project site is urban and does not provide suitable
habitat for listed plants.
d. Proposed landscaping, use of native plants, or other measures to preserve or enhance
vegetation on the site, if any.
Cleared infield grasses will be reseeded post-construction. No other landscaping is
proposed.
e. List all noxious weeds and invasive species known to be on or near the site.
According to King County iMap, tansy ragwort (Jacobaea vulgaris), a Class B noxious
weed, has been identified along Perimeter Rd E adjacent to the Cedar River in the
southeastern portion of the site (King County 2024).
Other invasive species found onsite include Himalayan blackberry, reed canary grass,
English ivy, holly (Ilex sp.), and Scotch broom (Cytisus scoparius). These species are
found in dense patches along the shorelines of Lake Washington and the Cedar River.
5. Animals
Find help answering animal questions8
a. List any birds and other animals that have been observed on or near the site or are
known to be on or near the site.
Animal species observed and/or known to be on site include:
• Birds: mallard (Anas platyrhynchos), dark-eyed junco (Junco hyemalis), American
coot (Fulica americana), common merganser (Mergus merganser), bufflehead
(Bucephala albeola), northern flicker (Colaptes auratus), Canada goose (Branta
canadensis), American robin (Turdus migratorius), red-winged blackbird
(Agelaius phoeniceus), bald eagle (Haliaeetus leucocephalus), violet-green
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swallow (Tachycineta thalassina), Brewer’s blackbird (Euphagus cyanocephalus),
black-capped chickadee (Poecile atricapillus), white-crowned sparrow
(Zonotrichia leucophrys), greater scaup (Aythya marila), mourning dove (Zenaida
macroura), California gull (Larus californicus), American crow (Corvus
brachyrhynchos), house sparrow (Passer domesticus) and European starling
(Sturnus vulgaris). Birders have documented 187 bird species to occur in the area
(eBird 2024).
• Mammals: eastern gray squirrel (Sciurus carolinensis), raccoon (Procyon lotor),
eastern cottontail (Sylvilagus floridanus), and nutria (Myocastor coypus)
• Fish: Lake Washington and the Cedar River, adjacent to the Project site, are
mapped by WDFW Priority Habitat and Species (PHS) as habitat for steelhead
(Oncorhynchus mykiss), sockeye/kokanee (O. nerka), Chinook (O. tshawytscha),
coho (O. kisutch), resident coastal cutthroat trout (O. clarki), and Dolly
Varden/bull trout (Salvelinus malma/S. confluentus) (WDFW 2024).
b. List any threatened and endangered species known to be on or near the site.
Bull trout, Chinook, and steelhead are federally-listed salmonid species known to occur
in the Cedar River and Lake Washington, adjacent to the site (SWIFD 2024).
c. Is the site part of a migration route? If so, explain.
The project site, along with the entire Puget Sound region, is located within the Pacific
Flyway, which is a flight corridor for migrating waterfowl and other birds. The Pacific
Flyway extends south from Alaska to Mexico and South America. No portions of t he
proposed project would interfere with or alter the Pacific Flyway .
d. Proposed measures to preserve or enhance wildlife, if any.
Impacts to wildlife are not anticipated as a result of the project; therefore, measures
have not been proposed. The project would not impact the Pacific Flyway. During
construction, BMPs would be put in place to isolate and protect waters in the vicinity o f
the construction, as needed, and therefore no impacts to fish species are anticipated.
e. List any invasive animal species known to be on or near the site.
Mammals including eastern cottontail, eastern gray squirrel, and nutria are known to
occur on or near the site. Birds including European starling and house sparrow are also
known to occur on or near the site.
6. Energy and natural resources
Find help answering energy and natural resource questions9
a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet
the completed project's energy needs? Describe whether it will be used for heating,
manufacturing, etc.
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Construction equipment will require the use of oil and gas to complete proposed Project
work. Taxiway A edge light system replacement and lighted guidance sign replacement
is proposed as part of the Project which will be connected to existing underground
electrical lines.
b. Would your project affect the potential use of solar energy by adjacent properties? If
so, generally describe.
The Project would not affect solar energy use by adjacent properties.
c. What kinds of energy conservation features are included in the plans of this proposal?
List other proposed measures to reduce or control energy impacts, if any.
The Project will require a very limited power supply and therefore, will not require
energy conservation needs. That said, installation of energy efficient LED lighting and
guidance signs will provide for a reduction in longer term electrical needs at the Airport.
7. Environmental health
Health Find help with answering environmental health questions10
a. Are there any environmental health hazards, including exposure to toxic chemicals,
risk of fire and explosion, spill, or hazardous waste, that could occur because of this
proposal? If so, describe.
With any construction project, there is the risk of potential construction-related spills or
leaks. This project would face similar risks, but all risks would be well within the range of
typical construction projects. BMPs and mitigation measures will be implemented to
minimize risk. No toxic chemicals would be used or stored at the construction sites,
other than fuels and other construction-related fluids.
1. Describe any known or possible contamination at the site from present or past
uses.
The Washington State Department of Ecology’s Spills and Cleanup map identifies a
cleanup site at the Renton Municipal Airport (Action Aviation - clean site ID# 6266).
This site has been affected by benzene and petroleum-based candidates. Cleanup
for this site has started but has not been completed (Ecology 2024).
2. Describe existing hazardous chemicals/conditions that might affect project
development and design. This includes underground hazardous liquid and gas
transmission pipelines located within the project area and in the vicinity.
There are no known hazardous chemicals or conditions present within the Project
area that might affect the Project area and/or vicinity.
3. Describe any toxic or hazardous chemicals that might be stored, used, or produced
during the project's development or construction, or at any time during the
operating life of the project.
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Fuels and motor oil will be used for the equipment during construction. The
completed Project will not require the use of any hazardous chemicals.
4. Describe special emergency services that might be required.
Emergency services are not anticipated to be required during project construction.
However, since this Project is located at an active airport, emergency services will be
notified about the Project prior to its construction.
5. Proposed measures to reduce or control environmental health hazards, if any.
As described in 7a above, applicable measures would be followed to minimize the
release of any hazardous materials, if encountered. Additionally, a Spill Prevention
Control and Countermeasure plan will be approved prior to construction.
b. Noise
1. What types of noise exist in the area which may affect your project (for example:
traffic, equipment, operation, other)?
Airplane traffic at the site, vehicular traffic along nearby roadways, and boat traffic
in Lake Washington are the major noise sources in the area. These sources will not
have any effect on the Project.
2. What types and levels of noise would be created by or associated with the project
on a short-term or a long-term basis (for example: traffic, construction, operation,
other)? Indicate what hours noise would come from the site)?
Short-term noise levels will increase due to typical construction activities, such as
the temporary operation of construction equipment. Work will occur during daytime
and evening hours only (7:00am to 10:00pm). Operation and maintenance of the
Project, post-construction, will not result in any additional noise.
3. Proposed measures to reduce or control noise impacts, if any:
Construction work would be limited to typical workday and work week hours.
Nighttime and weekend work is not anticipated. The Project would follow King
County noise guidelines which allow the use of heavy equipment from 7 am to 7 pm
weekdays, impact equipment from 8 am to 5 pm weekdays, and all other
construction activities from 7 am to 10 pm weekdays.
8. Land and shoreline use
Find help answering land and shoreline use questions11
a. What is the current use of the site and adjacent properties? Will the proposal affect
current land uses on nearby or adjacent properties? If so, describe.
The site is an active general aviation and FAA-designated reliever airport that provides
regional airport services for air charter, air taxi, corporate flights, business, and
recreational flyers. Adjacent properties include Boeing to the east, an aircraft
11 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist-
guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-8-Land-shoreline-use
SEPA Environmental checklist September 2023 Page 14
(WAC 197-11-960)
manufacturer, and residential areas to the west. The proposal will not change the
current use of the airport and will not affect current land uses on nearby or adjacent
properties.
b. Has the project site been used as working farmlands or working forest lands? If so,
describe. How much agricultural or forest land of long-term commercial significance
will be converted to other uses because of the proposal, if any? If resource lands have
not been designated, how many acres in farmland or forest land tax status will be
converted to nonfarm or nonforest use?
The site has not been used as working farmlands or forest lands.
1. Will the proposal affect or be affected by surrounding working farm or forest
land normal business operations, such as oversize equipment access, the
application of pesticides, tilling, and harvesting? If so, how?
The project would neither affect, nor be affected by working farm or forest land
operations.
c. Describe any structures on the site.
Structures on site include aircraft hangars, an aircraft paint booth, an air traffic control
tower, and other buildings supporting aircraft operations, signage, lighting, and an
underground fire water line.
d. Will any structures be demolished? If so, what?
Site demolition consists of reconstruction of existing pavement and the replacement of
utilities including lighting and the existing underground fire water line. No buildings will
be demolished as a part of the Project.
e. What is the current zoning classification of the site?
The Project site is currently zoned Medium Industrial (MI).
f. What is the current comprehensive plan designation of the site?
The Project site is designated as Employment Area (EA).
g. If applicable, what is the current shoreline master program designation of the site?
Both the Lake Washington shoreline and Cedar River shoreline are designated as High
Intensity.
h. Has any part of the site been classified as a critical area by the city or county? If so,
specify.
In addition to the Cedar River floodway and the regulated shorelines of Lake
Washington and Cedar River, the City of Renton COR Maps the entire site as a seismic
hazard and a Zone X Flood Area (500 year flood). It also maps protected slopes along the
shoreline of Lake Washington and a Wellhead Protection Area to the south of the
Project site.
i. Approximately how many people would reside or work in the completed project?
SEPA Environmental checklist September 2023 Page 15
(WAC 197-11-960)
No one would reside in the completed Project. After construction, workers that
currently work at the Airport would continue to work in the completed project.
j. Approximately how many people would the completed project displace?
The completed Project would not displace any people.
k. Proposed measures to avoid or reduce displacement impacts, if any.
Displacement would not occur as a result of the project; therefore, no mitigation
measures are required.
l. Proposed measures to ensure the proposal is compatible with existing and projected
land uses and plans, if any.
The proposed project will not change the existing land use of the site; therefore, no
mitigation measures are required.
m. Proposed measures to reduce or control impacts to agricultural and forest lands of
long-term commercial significance, if any:
There are no agricultural or forest lands in the Project vicinity.
9. Housing
Find help answering housing questions12
a. Approximately how many units would be provided, if any? Indicate whether high,
middle, or low-income housing.
No housing units would be provided by the Project.
b. Approximately how many units, if any, would be eliminated? Indicate whether high,
middle, or low-income housing.
No housing units would be eliminated by the Project.
c. Proposed measures to reduce or control housing impacts, if any:
No housing impacts will occur; therefore, no mitigation is required.
10. Aesthetics
Find help answering aesthetics questions13
a. What is the tallest height of any proposed structure(s), not including antennas; what is
the principal exterior building material(s) proposed?
The tallest proposed structure will be the upgraded lighting infrastructure to support
aircraft safety. These structures will replace existing structures and are estimated to be
under 5 feet in height.
12 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist-
guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-9-Housing
13 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist-
guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-10-Aesthetics
SEPA Environmental checklist September 2023 Page 16
(WAC 197-11-960)
b. What views in the immediate vicinity would be altered or obstructed?
No views in the immediate vicinity would be altered or obstructed as a result of the
Project.
c. Proposed measures to reduce or control aesthetic impacts, if any :
No impacts to aesthetics will occur as a result of the Project; therefore, no mitigation
measures are proposed.
11. Light and glare
Find help answering light and glare questions14
a. What type of light or glare will the proposal produce? What time of day would it
mainly occur?
The proposal will replace the existing taxiway edge lighting and signage systems to
support aircraft operational safety. These lights and lighted signs have the potential to
operate 24/7 to support aircraft operations.
b. Could light or glare from the finished project be a safety hazard or interfere with
views?
The Project will replace the existing taxiway edge lighting and signage systems. As of
now, no additional lights are proposed. However, it is possible that a small number of
additional lights may be required to comply with current FAA standards. Any new or
replaced lights will increase aircraft operational safety. Therefore, lighting as a result of
the finished Project, will not result in a safety hazard or interfere with views.
c. What existing off-site sources of light or glare may affect your proposal?
There are no offsite sources of light or glare that would affect the Project.
d. Proposed measures to reduce or control light and glare impacts, if any:
As of now, no additional lights are proposed. However, it is possible that a small number
of additional lights may be required to comply with current FAA standards. The increase
in light count is anticipated to be minor and would be necessary to support aircraft
operational safety. Therefore, no mitigation measures are proposed.
12. Recreation
Find help answering recreation questions
a. What designated and informal recreational opportunities are in the immediate
vicinity?
As an active municipal airport, the site provides opportunities for recreational flyer s. In
addition, the site hosts a seaplane ramp for recreational flyers to moor their seaplanes
on Lake Washington.
b. Would the proposed project displace any existing recreational uses? If so, describe.
14 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist-
guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-11-Light-glare
SEPA Environmental checklist September 2023 Page 17
(WAC 197-11-960)
The proposal will not change the current use of the site and will not displace any
existing recreational uses.
c. Proposed measures to reduce or control impacts on recreation, including recreation
opportunities to be provided by the project or applicant, if any:
No impacts to recreational uses are anticipated as a result of the Project; therefore, no
mitigation measures are proposed.
13. Historic and cultural preservation
Find help answering historic and cultural preservation questions15
a. Are there any buildings, structures, or sites, located on or near the site that are over
45 years old listed in or eligible for listing in national, state, or local preservation
registers? If so, specifically describe.
There are no buildings, structures, or sites located on or adjacent to the project site that
are currently listed in the National Register of Historic Places (NRHP), Washington
Heritage Register, or King County Landmarks Register (Washington State Departme nt of
Archaeology and Historic Preservation [DAHP], 2024; KCHPP, 2024).
The Renton Municipal Airport was established in 1941-1945, making the facility over 45
years old. In the 1920s, the prior landowner operated the Bryn Mawr Airfield at this
location; today’s runway was built in 1943 and the facility was used by the Department
of the Navy and the Boeing Company for World War II production of the B-29 military
airplanes (Bucher, Willis, and Ratliff Corporation, 1997). The City acquired the airport in
1946 after the end of World War II.
The Airport has not yet been inventoried and evaluated for its potential eligibility to the
NRHP or as a King County Landmark. In addition to its runway and taxiway features, the
Airport includes at least 22 individual structures built in or before 1979, m aking these
individual structures also over 45 years old (King County Assessor, 2024; NETROnline,
2024). Three of these buildings have been previously recorded and determined not
eligible for listing in the NRHP; however, the majority of the Renton Municip al Airport
individual historic-aged structures and features have not yet been recorded on DAHP
historic property inventory forms (DAHP, 2024).
Directly south of the Renton Municipal Airport, on the opposite side of Airport Way, is
the Jolly Boy Drive In at 111 Airport Way (DAHP Property ID #344312). Constructed in
1956, this building was determined eligible for listing in the NRHP in 2020 (Chambe rs,
2020; DAHP, 2024).
b. Are there any landmarks, features, or other evidence of Indian or historic use or
occupation? This may include human burials or old cemeteries. Are there any material
evidence, artifacts, or areas of cultural importance on or near the site? Please list any
professional studies conducted at the site to identify such resources.
15 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist-
guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-13-Historic-cultural-p
SEPA Environmental checklist September 2023 Page 18
(WAC 197-11-960)
The Project is located within the ancestral lands of the Duwamish people, who are
among the signatories of the 1855 Treaty of Point Elliott (Marino 1990). The Duwamish
are part of the larger Southern Coast Salish cultural group (Suttles and Lane 1990).
Descendants of the Duwamish are members of today’s non-Federally recognized
Duwamish Tribe and Federally-recognized tribes including the Muckleshoot Indian Tribe,
Snoqualmie Indian Tribe, Suquamish Tribe, Tulalip Tribes, and others (Miller and Blukis
Onat 2004:24-25, 56-108). Based on available publications, there are multiple places
with Indigenous names (“placenames”) in close proximity to the project site, including a
village located at the confluence of the original Cedar River and Black River channels,
which was in very close proximity to the southwest portion of today’s Airport (Hilbert et
al., 2001; Lane, 1975).
To date, Taxiway A does not contain any archaeological sites, cemeteries, or traditional
cultural properties that have been recorded with DAHP (DAHP, 2024). However, the
Airport is classified in the DAHP Statewide Predictive Model as Moderate to Very High
Risk for containing precontact-era archaeological resources (DAHP, 2024). There are 15
recorded archaeological sites within 1.0 mile of Taxiway A; six are precontact-era sites
and nine are historic-era sites (DAHP, 2024). Two of these archaeological sites are within
the Airport (45KI1218 and 45KI1344) but outside of Taxiway A; these were identified
during construction monitoring. The recorded precontact-era archaeological sites are all
located at least 0.25 mile from the project site.
No previous cultural resources assessments have examined Taxiway A, although several
have been conducted within the Airport. In 2014, archaeological monitoring was
conducted along the south edge of the Airport for replacement of a blast wall, during
which ca. 1930-1940 historic-era debris was identified and recorded as archaeological
site 45KI1218 (Butler, 2014 [NADB 1686449]; Stegner, 2014). The site predates the
development of the airport and was determined not eligible for listing in the NRHP in
2014 (DAHP, 2024). In 2017, archaeological monitoring was conducted along the
southeast portion of the Airport and resulted in the identification of archaeological site
45KI1344, a pre-1941 historic-era debris scatter (Anderson, 2017 [NADB 1689846]); no
NRHP eligibility determination is documented for this site.
Two cultural resources surveys have been conducted less than 300 feet west of Taxiway
A, along Rainier Avenue: one for development of a section of the Lake Washington Loop
Trail (Baldwin et al., 2016 [NADB 1688490]), the other for sidewalk and road
improvements along Rainier Avenue which also resulted in the identification and
evaluation of historic resources including the Jolly Boy Drive In (Baldwin et al. 2020
[NADB 1693420]). Both of the surveys directly west of Taxiway A consisted of pedestrian
and subsurface archaeological survey; no archaeological resources were identified as a
result (Baldwin et al., 2016; Baldwin et al., 2020). There have been over 40 additional
cultural resources surveys conducted within 1.0 mile of the project site.
Prior to historic filling, dredging, channelization, and other development activities, the
project site existed as the southern extent of Lake Washington and as a flood plain for
the Cedar River and Black River, which joined just south of the project site (GeoSciences
Inc., 2023; USGS, 1897). The south and southwest portions of today’s Airport were once
SEPA Environmental checklist September 2023 Page 19
(WAC 197-11-960)
shoreline (Chrzastowski, 1983). The Natural Resources Conservation Service classifies
soils within the project site as Urban Land (NRCS 2024). This designation signifies that
natural soil sequences have been disrupted by widespread urbanization, including
grading and filling. A geotechnical investigation of the project site conducted in 2023
generally encountered pavement and fill soils placed during construction of the Renton
Municipal Airport between 1941 and 1945 overlying alluvial deposits from Lake
Washington, the Black River, and the Cedar River (GeoSciences Inc., 2023). Pavement
and fill soils extended to an average depth of 5 feet below surface although fill thickness
varied widely across the project site, from 2 feet to over 11 feet below surface
(GeoSciences Inc., 2023).
c. Describe the methods used to assess the potential impacts to cultural and historic
resources on or near the project site. Examples include consultation with tribes and
the department of archeology and historic preservation, archaeological surveys,
historic maps, GIS data, etc.
Methods used included reviewing background data. The following information was
reviewed: the DAHP’s Washington Information System for Architectural and
Archeological Records Data (WISAARD) database (DAHP, 2024), King County Online
Property Information (King County Assessor, 2024), historical maps and aerial imagery
(Chrzastowski, 1983; USGS, 1897; NETROnline, 2024), previous geotechnical reports
(GeoSciences Inc., 2023), and published ethnographies and regional histories (Hilbert et
al., 2001; Lane, 1975; Suttles and Lane, 1990).
d. Proposed measures to avoid, minimize, or compensate for loss, changes to, and
disturbance to resources. Please include plans for the above and any permits that may
be required.
Due to federal funding, it is assumed that this project is also subject to compliance with
the National Historic Preservation Act (commonly referred to as “Section 106”). The lead
federal agency for Section 106 is the FAA. However, because the Project is a pavement
rehabilitation project that is entirely within the boundaries of the prior ground
disturbance, it is Categorically Excluded (CatEx) under FAA Order 1050.1F 5-6.4e, f, and
o. The undocumented CatEx determination was received by the FAA on October 18,
2022. Since excavation will be limited to the depth of the existing pavement section
(there will be no excavation deeper than subgrade, or bottom of base rock), FAA
determined that additional cultural resources consultation was not necessary for the
project. Additionally, because all work will occur within the already built environment,
no measures to avoid, minimize, or compensate for loss, changes to, or disturbance to
resources are being proposed.
SEPA Environmental checklist September 2023 Page 20
(WAC 197-11-960)
14. Transportation
Find help with answering transportation questions16
a. Identify public streets and highways serving the site or affected geographic area and
describe proposed access to the existing street system. Show on site plans, if any.
The site can be accessed by Rainier Avenue South, the main thoroughfare through
downtown Renton, by heading east on Airport Way and north on West Perimeter Road.
b. Is the site or affected geographic area currently served by public transit? If so,
generally describe. If not, what is the approximate distance to the nearest transit
stop?
The closest transit stop is approximately 420 feet south of the intersection of Rainier
Ave South and Airport Way at the intersection of Rainier Ave South and Hayse Place
Southwest. This stop is serviced by King County Metro bus route 107.
c. Will the proposal require any new or improvements to existing roads, streets,
pedestrian, bicycle, or state transportation facilities, not including driveways? If so,
generally describe (indicate whether public or private).
The proposal will improve the existing Taxiway A and taxiway connectors (A1 – A7)
which are publicly available to licensed aircraft pilots. The project does include trenching
across Perimeter Rd to provide for the reconfiguration of an existing fire waterline feed.
The impacts to Perimeter Rd will be temporary, and phased appropriately to reduce
impacts to users. No additional transportation facility construction or improvements are
proposed.
d. Will the project or proposal use (or occur in the immediate vicinity of) water, rail, or
air transportation? If so, generally describe.
The proposal is occurring on an active public use general aviation airport used for
recreational and commercial air transportation. The site is also an airport reliever site
for the Sea-Tac International Airport.
e. How many vehicular trips per day would be generated by the completed project or
proposal? If known, indicate when peak volumes would occur and what percentage of
the volume would be trucks (such as commercial and nonpassenger vehicles). What
data or transportation models were used to make these estimates?
The completed Project would not generate any additional vehicular trips.
f. Will the proposal interfere with, affect, or be affected by the movement of agricultural
and forest products on roads or streets in the area? If so, generally describe.
The project will neither affect nor be affected by agricultural or forest product
transportation.
g. Proposed measures to reduce or control transportation impacts, if any:
16 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist-
guidance/SEPA-Checklist-Section-B-Environmental-elements/Environmental-elements-14-Transportation
SEPA Environmental checklist September 2023 Page 21
(WAC 197-11-960)
The selected contractor will be required to work with airport personnel to prepare
aircraft traffic control plans. No impacts to transportation are anticipated after
construction is completed.
15. Public services
Find help answering public service questions17
a. Would the project result in an increased need for public services (for example: fire
protection, police protection, public transit, health care, schools, other)? If so,
generally describe.
The project would not result in a need for increased public services.
b. Proposed measures to reduce or control direct impacts on public services, if any.
Impacts to public services are not anticipated; therefore, mitigation measures have not
been developed.
16. Utilities
Find help answering utilities questions18
a. Circle utilities currently available at the site: electricity, natural gas, water, refuse
service, telephone, sanitary sewer, septic system, other:
b. Describe the utilities that are proposed for the project, the utility providing the
service, and the general construction activities on the site or in the immediate vicinity
which might be needed.
The Project will be replacing an existing water main and upgrading infield stormwater
drainage. Power to the site is provided by Puget Sound Energy (PSE). Water supply is
provided by the City of Renton in the Kennydale 308-hydraulic pressure zone.
Wastewater service is also provided by the City of Renton.
C. Signature
Find help about who should sign19
The above answers are true and complete to the best of my knowledge. I understand that the
lead agency is relying on them to make its decision.
17 https://ecology.wa.gov/regulations-permits/sepa/environmental-review/sepa-guidance/sepa-checklist-
guidance/sepa-checklist-section-b-environmental-elements/environmental-elements-15-public-services
18 https://ecology.wa.gov/regulations-permits/sepa/environmental-review/sepa-guidance/sepa-checklist-
guidance/sepa-checklist-section-b-environmental-elements/environmental-elements-16-utilities
19 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist-
guidance/SEPA-Checklist-Section-C-Signature
SEPA Environmental checklist September 2023 Page 22
(WAC 197-11-960)
X
Type name of signee:
Position and agency/organization:
Date submitted:
D. Supplemental sheet for nonproject actions
Find help for the nonproject actions worksheet20
Do not use this section for project actions.
Because these questions are very general, it may be helpful to read them in conjunction with
the list of the elements of the environment.
When answering these questions, be aware of the extent the proposal, or the types of activities
likely to result from the proposal, would affect the item at a greater intensity or at a faster rate
than if the proposal were not implemented. Respond briefly and in general terms.
1. How would the proposal be likely to increase discharge to water; emissions to air;
production, storage, or release of toxic or hazardous substances; or production of
noise?
• Proposed measures to avoid or reduce such increases are:
2. How would the proposal be likely to affect plants, animals, fish, or marine life?
• Proposed measures to protect or conserve plants, animals, fish, or marine life are:
3. How would the proposal be likely to deplete energy or natural resources?
• Proposed measures to protect or conserve energy and natural resources are:
20 https://ecology.wa.gov/regulations-permits/sepa/environmental-review/sepa-guidance/sepa-checklist-
guidance/sepa-checklist-section-d-non-project-actions
SEPA Environmental checklist September 2023 Page 23
(WAC 197-11-960)
4. How would the proposal be likely to use or affect environmentally sensitive areas or
areas designated (or eligible or under study) for governmental protection, such as
parks, wilderness, wild and scenic rivers, threatened or endangered species habitat,
historic or cultural sites, wetlands, floodplains, or prime farmlands?
• Proposed measures to protect such resources or to avoid or reduce impacts are:
5. How would the proposal be likely to affect land and shoreline use, including whether it
would allow or encourage land or shoreline uses incompatible with existing plans ?
• Proposed measures to avoid or reduce shoreline and land use impacts are:
6. How would the proposal be likely to increase demands on transportation or public
services and utilities?
• Proposed measures to reduce or respond to such demand(s) are:
7. Identify, if possible, whether the proposal may conflict with local, state, or federal laws
or requirements for the protection of the environment.
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Vicinity Map
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