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SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 1 of 13
SEPA 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 probable 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-projects) questions in Part B - Environmental Elements –that do not
contribute meaningfully to the analysis of the proposal.
A. Background [HELP]
1. Name of proposed project, if applicable: Brotherton New Cadillac Dealership &
Brotherton Buick-GMC Building Addition
2. Name of applicant: Brad Brotherton
SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 2 of 13
3. Address and phone number of applicant and contact person: 215 SW 12TH Street, Renton,
WA 98057; (425) 336-1089
4. Date checklist prepared: January 31, 2022
5. Agency requesting checklist: City of Renton
6. Proposed timing or schedule (including phasing, if applicable): Demolition of residences
and site features on the new Cadillac dealership properties will be completed during
winter/spring 2022 by current owner as part of the lease agreement. Development of
the new Cadillac dealership is planned for summer 2022. Development of the Buick-
GMC building addition is planned for summer 2022.
7. Do you have any plans for future additions, expansion, or further activity related to or
connected with this proposal? If yes, explain. Not at this time.
8. List any environmental information you know about that has been prepared, or will be
prepared, directly related to this proposal. None known.
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
known.
10. List any government approvals or permits that will be needed for your proposal, if known.
SEPA Review, Site Plan Review, Building permits, Grading & Site Development
permits.
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 those answers on this
page. (Lead agencies may modify this form to include additional specific information on
project description.)
NEW CADILLAC DEALERSHIP:
Current parcel numbers 334040-2780, 334040-2805, 334040-2880, 334040-2925; total
area 52,657 SF (1.21 acres). Existing houses and site features to be demolished by
current property owners per terms of property lease. Upon completion of demolition,
combination of properties, parcel line adjustment, and acquisition of necessary
building and site development permits, a new 16,635 SF Cadillac dealership building
will be constructed on-site. Building will be constructed with paved site vehicular
(driving and parking) and pedestrian concrete and asphalt surfaces, perimeter
landscaping, and associated utility improvements such as stormwater, sanitary sewer,
domestic and fire water, power, and communications.
BUICK-GMC BUILDING ADDITION:
Current parcel numbers 334040-2820, 334040-2850, 334040-2860, 334040-2870, and
334040-2885; total area 70,955 SF (1.63 acres). This project will include a 4,416 SF
addition to the Service Department of the existing Brotherton Cadillac-Buick-GMC
building. The addition will be located at the southwest portion of the existing building
and will be construted at the location of an existing asphalt paved parking lot.
SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 3 of 13
Sanitary sewer and domestic/fire water services for the building addition will be
provided via connections to the systems in the existing building. Site improvements
will include new asphalt pavement, stormwater utilities, sidewalk and curb ramps
along Maple Ave SW, and landscaping.
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 required by the agency, you
are not required to duplicate maps or detailed plans submitted with any permit applications
related to this checklist. The project is located at 215 SW 12th Street, Renton, WA 98055.
King County tax parcel numbers for each portion of the project are listed in the
previous response. The site is located in the NW ¼ of Section 19, Township 23 North,
Range 5 East, Willamette Meridian, in King County, Washington. Site plan and vicinity
maps are included with the SEPA permitting package.
B. Environmental Elements [HELP]
1. Earth [help]
a. General description of the site: The project site is generally flat, and fully developed with
the existing dealership on the westerly portion of the site, and four residences on the
easterly portion of the site.
(circle one): Flat, rolling, hilly, steep slopes, mountainous, other _____________
b. What is the steepest slope on the site (approximate percent slope)? ±25% at the easterly
margin of the site abutting the Maple Ave SW ROW. Average slope throughout the
dealership portion of the site is ±3%. Average slope throughout the residence portion
of the site is ±5%
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. A geotechnical report prepared by Migizi Group, Inc, dated
July 8, 2021 is included with the SEPA permitting package. Per the report, on-site
soils consist of “a surface mantle of sod and topsoil or asphaltic concrete, underlain
by native alluvial deposits”. “The uppermost 8 feet of soil deposits encountered in our
explorations are largely poorly consolidated and fine-grained, ranging in composition
from silty sand to silt. Underlying this material are intermediate gravels, which were
encountered in a medium dense to very dense in situ condition and extended through
a depth of 15 to 20 feet below existing grade, before transitioning to another fin-
grained soil horizon. In the vicinity of augure boring exploration B-2, the fine grained
horizon was 15 feet thick, whereas in the remaining two explorations, it was only
observed from a depth of 20 to 25 feet below the intermediate gravel. The final soil
horizon consists of deep gravels, which were again encountered in a medium dense to
very dense in situ condition. This deep gravel soil horizon was observed through the
termination of all our subsurface explorations, a maximum depth of 36 ½ feet below
existing grade.
SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 4 of 13
d. Are there surface indications or history of unstable soils in the immediate vicinity? If so,
describe. No.
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. Our conceptual site
plan will disturb approximately 51,000 SF of surface; and will involve earthwork of
approximately 430 CY cut and 370 CY fill, for a total earthwork of 800 CY (60 CY net
cut). Fill will be comprised of structural fill obtained from local quarry, as sourced by
the earthwork contractor. Structural fill will be in accordance with Washington State
Department of Transportation standard specifications.
f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe.
Earthwork to prepare site for proposed building and permanent site features will
generally be lower than existing grade, and contained within the excavation footprint.
Installation of temporary erosion and sedimentation control (TESC) devices will be
required prior to clearing and grading activity. The proposed building, paved
surfaces, and landscaping will provide permanent stabilization for all exposed
surfaces.
g. About what percent of the site will be covered with impervious surfaces after project
construction (for example, asphalt or buildings)? Approximately 94% of the total site area
will be covered with impervious surfaces upon completion of construction.
h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any:
As described in section “f” above, TESC measures will be installed to minimize
erosion during construction. After construction, the site will be permanently stabilized
with buildings, pavement, and landscaped surfaces.
2. Air [help]
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. Typical earthwork construction equipment is
expected to be used during construction of the project. Upon completion of the
project, we do not anticipate any emissions from the site that are atypical for an
automotive dealership.
b. Are there any off-site sources of emissions or odor that may affect your proposal? If so,
generally describe. None known.
c. Proposed measures to reduce or control emissions or other impacts to air, if any: None
proposed
3. Water [help]
a. Surface Water: [help]
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. No.
SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 5 of 13
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. No.
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. N/A
4) Will the proposal require surface water withdrawals or diversions? Give general
description, purpose, and approximate quantities if known. No.
5) Does the proposal lie within a 100-year floodplain? If so, note location on the site plan.
No.
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. No.
b. Ground Water: [help]
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 general
description, purpose, and approximate quantities if known. Dewatering of groundwater
may be required for construction of deep stormwater detention vault or pump
station structures. Quantities depend on seasonal groundwater table elevation,
and the time and duration of construction.
2) Describe waste material that will be discharged into the ground from septic tanks or
other sources, if any (for example: 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. None proposed.
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 is the only runoff
anticipated on-site. All stormwater from on-site new or replaced pollution
generating surfaces will be collected in a conveyance system and routed through a
stormwater treatment device appropriately sized for the area. Stormwater from
new/replaced surfaces will be detained in accordance with the City of Renton
Stormwater Manual and discharged to the City stormwater system.
2) Could waste materials enter ground or surface waters? If so, generally describe. The site
will be equipped with a stormwater system designed to collect surface water runoff
and convey it to the City system via a stormwater treatment device.
3) Does the proposal alter or otherwise affect drainage patterns in the vicinity of the site? If
so, describe. No, all surface water is currently tributary to the City stormwater
system in Maple Ave SW. An existing regional stormwater system exists on-site,
and collects stormwater from the subject parcel, as well as from parcels to the east
SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 6 of 13
and north (across 12th St SW). The collection system conveys stormwater to the
City system in Maple Ave SW, via an existing wet detention vault.
d. Proposed measures to reduce or control surface, ground, and runoff water, and drainage
pattern impacts, if any: We are proposing to install a new detention and treatment system
on the Cadillac site to mimic existing runoff conditions from the site. Stormwater
discharged from the site will also be treated.
4. Plants [help]
a. Check the types of vegetation found on the site:
_x__deciduous tree: alder, maple, aspen, other
_x__evergreen tree: fir, cedar, pine, other
_x__shrubs
_x__grass
____pasture
____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? The lease agreement of
the property proposed for the Brotherton Cadillac building requires clearing of the
site. All trees on the Cadillac site will be removed prior to construction. The Buick-
GMC building addition site will require the removal of one 14” maple tree to
accommodate a vehicular door of the building.
c. List threatened and endangered species known to be on or near the site. None known.
d. Proposed landscaping, use of native plants, or other measures to preserve or enhance
vegetation on the site, if any: Trees and landscaping will be installed replaced in
accordance with City of Renton landscaping requirements.
e. List all noxious weeds and invasive species known to be on or near the site. None known.
5. Animals [help]
a. List any birds and other animals which have been observed on or near the site or are known
to be on or near the site.
Examples include:
birds: hawk, heron, eagle, songbirds, other:
mammals: deer, bear, elk, beaver, other:
fish: bass, salmon, trout, herring, shellfish, other ________
b. List any threatened and endangered species known to be on or near the site. None known.
SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 7 of 13
c. Is the site part of a migration route? If so, explain. Pacific flyway.
d. Proposed measures to preserve or enhance wildlife, if any: None proposed.
e. List any invasive animal species known to be on or near the site. None known.
6. Energy and Natural Resources [help]
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. Electric or natural gas, heating only.
b. Would your project affect the potential use of solar energy by adjacent properties?
If so, generally describe. No other sites are in proximity to be affected by the
addition/new building.
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: None.
7. Environmental Health [help]
a. Are there any environmental health hazards, including exposure to toxic chemicals, risk
of fire and explosion, spill, or hazardous waste, that could occur as a result of this proposal?
If so, describe. There are no environmental hazards associated with this proposal that
are atypical from automotive dealership/maintenance. The dealership will utilize
industry standard BMPs to contain these materials and prevent spills.
1) Describe any known or possible contamination at the site from present or past uses.
None known.
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. None known.
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. Fluids such as gasoline, motor oil, antifreeze, etc. are expected
to be present on the site both during construction and throughout the life of the
project. After completion all hazardous chemicals will be stored in approved
containers.
4) Describe special emergency services that might be required. None known.
5) Proposed measures to reduce or control environmental health hazards, if any: The
contractor and dealership will provide measures for rapid cleanup and reporting
of any accidental spills of materials which could present an environmental
hazard.
b. Noise
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1) What types of noise exist in the area which may affect your project (for example:
traffic, equipment, operation, other)? Traffic on nearby Interstate 405, 12th Street SW,
and Maple Ave SW. Engine noise on-site and from other automobile dealerships
adjacent to the site.
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)? Indi-
cate what hours noise would come from the site. During construction of the project,
we expect the noise of conventional earthwork moving equipment, and tools for
construction of the building to be heard during authorized hours. After
construction, noise will be limited to cars and automotive tools inside the building
during normal business hours only.
3) Proposed measures to reduce or control noise impacts, if any: None proposed.
8. Land and Shoreline Use [help]
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. All properties adjacent to the
subject property are zoned Commercial Arterial with Auto Mall overlay. Adjacent
sites are also automotive dealerships or car lots. Interstate 405 is south of the project
site.
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 as a result 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 subject site has been developed for at least 50 years, not used as
farmlands or working 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: No.
c. Describe any structures on the site. The site is currently occupied by the Brotherton
Cadillac-Buick-GMC Renton dealership, and four single family residences and
outbuildings.
d. Will any structures be demolished? If so, what? All four residences and associated
outbuildings will be demolished prior to construction.
e. What is the current zoning classification of the site? Commercial Arterial with Auto Mall
overlay.
f. What is the current comprehensive plan designation of the site? Commercial Arterial with
Auto Mall overlay.
g. If applicable, what is the current shoreline master program designation of the site? N/A
SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 9 of 13
h. Has any part of the site been classified as a critical area by the city or county? If so, specify.
No, areas immediately south of the property, adjacent to the Interstate 405 on-ramp
have been designated as a landslide hazard area.
i. Approximately how many people would reside or work in the completed project?
j. Approximately how many people would the completed project displace? It is our
understanding that the existing residences proposed for demolition are already
vacated.
k. Proposed measures to avoid or reduce displacement impacts, if any: N/A
L. Proposed measures to ensure the proposal is compatible with existing and projected land
uses and plans, if any: N/A
m. Proposed measures to reduce or control impacts to agricultural and forest lands of long-term
commercial significance, if any: N/A
9. Housing [help]
a. Approximately how many units would be provided, if any? Indicate whether high, mid-
dle, or low-income housing. None.
b. Approximately how many units, if any, would be eliminated? Indicate whether high,
middle, or low-income housing. Four low/middle income single family residences will be
demolished prior to commencement of construction, under a separate permit.
c. Proposed measures to reduce or control housing impacts, if any: N/A
10. Aesthetics [help]
a. What is the tallest height of any proposed structure(s), not including antennas; what is
the principal exterior building material(s) proposed? 25’. Principal exterior building
materials include aluminum, glazing, and split face CMU.
b. What views in the immediate vicinity would be altered or obstructed? None.
c. Proposed measures to reduce or control aesthetic impacts, if any: N/A
11. Light and Glare [help]
a. What type of light or glare will the proposal produce? What time of day would it mainly
occur? The dealership will have parking lot lighting similar to other dealerships in the
vicinity.
b. Could light or glare from the finished project be a safety hazard or interfere with views? This
particular project will not substantially alter lighting in the vicinity to present a safety
hazard or interfere with views.
c. What existing off-site sources of light or glare may affect your proposal? None.
SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 10 of 13
d. Proposed measures to reduce or control light and glare impacts, if any: Shielded light
fixtures.
12. Recreation [help]
a. What designated and informal recreational opportunities are in the immediate vicinity? N/A
b. Would the proposed project displace any existing recreational uses? If so, describe. No.
c. Proposed measures to reduce or control impacts on recreation, including recreation
opportunities to be provided by the project or applicant, if any: None.
13. Historic and cultural preservation [help]
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. None known.
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. None known.
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.
No impacts are expected.
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. No
impacts are expected.
14. Transportation [help]
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. Both
project sites currently have and will maintain direct access to 12th Street SW, and
indirect access to Maple Ave.
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 site is
within ¼ mile of three King County Metro bus stops located on Grady Way SW, one
block north of 12th Street SW.
c. How many additional parking spaces would the completed project or non-project proposal
have? How many would the project or proposal eliminate? This project will eliminate 40
existing stalls among both sites, which will be offset by 26 new stalls on the Cadillac
dealership site. In addition, the Cadillac dealership site will designate large portions
of the new asphalt paved surface for vehicle display and staging of vehicles for the
service departments. These areas will not be explicitly marked as parking stalls to
provide flexibility.
SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 11 of 13
d. 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). A new driveway approach to 12th Street SW along
with curb/gutter and sidwalk will be constructed at the Cadillac dealership site. New
sidewalk and curb ramps will also be installed alongside the Buick-GMC site on
Maple Ave SW.
e. Will the project or proposal use (or occur in the immediate vicinity of) water, rail, or air
transportation? If so, generally describe. No.
f. 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? TBD per report prepared by Heath &
Associates, which will be submitted with the SEPA permit documentation.
g. 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. No.
h. Proposed measures to reduce or control transportation impacts, if any: None.
15. Public Services [help]
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. No.
b. Proposed measures to reduce or control direct impacts on public services, if any. None.
16. Utilities [help]
a. Circle utilities currently available at the site:
electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system,
other ___________ All of the above.
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. City of Renton stormwater sewer utility, sanitary sewer utility, and water
utility. PSE electricity and natural gas.
C. Signature [HELP]
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.
Signature: ___________________________________________________
Name of signee __________________________________________________
Position and Agency/Organization ____________________________________
Date Submitted: _____________
SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 12 of 13
D. Supplemental sheet for nonproject actions [HELP]
(IT IS NOT NECESSARY to use this sheet 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; pro-
duction, 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:
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:
SEPA Environmental checklist (WAC 197-11-960) July 2016 Page 13 of 13
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.
4815 Center Street
Tacoma, WA 98409-2319
(253) 474-9449 / sittshill.com
Brent K. Leslie, P.E., S.E.
Kathy A. Hargrave, P.E.
Larry G. Lindell, P.E., S.E.
Michael A. McEvilly, P.L.S.
Andrew J. Boileau, P.E., S.E.
David C. Boileau, AIA
Civil | Structural | Survey
January 31, 2022
BROTHERTON CADILLAC
215 SW 12th Street
Renton, Washington 98057
TO: Mr. Brad Brotherton
SUBJECT: CONSTRUCTION MITIGATION DESCRIPTION
BROTHERTON CADILLAC NEW BUILDING & BUICK-GMC SERVICE ADDITION
Dear Brad,
This letter is being written to satisfy the requirement for a Construction Mitigation Description for the
proposed construction of your new Cadillac dealership building, and the addition to your existing Buick-
GMC dealership building.
At this time, we anticipate construction will begin in the summer of 2022 and conclude by year’s end.
The proposed hours of operation for construction of the new building and building addition are 6am
through 4pm, Monday through Friday. These start and finish times are earlier than typical business
hours, and are intended to minimize traffic and transportation impacts.
Proposed hauling/transportation routes for vehicles accessing the new Cadillac dealership site will be
limited to a designated construction entrance off of SW 12th Street, until such time that the site work is
complete; all disturbed surfaces are stabilized; and the owner, engineer, and City inspector provide
written acceptance. For continuation of work within the building, it is expected that the permanent SW
12th Street driveway approach will be used for construction access. For the Buick-GMC construction,
access shall be provided via the existing paved driveway approach to SW 12th Street throughout the
duration of construction.
The construction plans for each project site will identify temporary erosion and sedimentation control
devices to be installed prior to construction, and maintained until the site is accepted by the owner,
engineer, and City inspector. These measures will minimize the migration of sediment into private or
public storm drainage systems. Also, the contractor shall be required to sweep as necessary to prevent
tracking sediment onto the public streets. The plans will also require a temporary traffic control plan
for all work abutting SW 12th Street and Maple Avenue SW, for installation of curb/gutter and sidewalk.
Please feel free to contact our office with any additional questions or comments regarding this project.
Sincerely,
Don Davis, P.E.
Senior Project Engineer
O:\19400\19480\Permits and Applications\~Master Document List\CM_Construction_Mitigation_Desc_220131_v1.docx