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HomeMy WebLinkAboutECF_SEPA_Checklist_250108_v1SEPA 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 -
projects) questions in “Part B: Environmental Elements” that do not contribute meaningfully to the analysis of
the proposal.
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A. Background
Find help answering background questions2
1. Name of proposed project, if applicable:
Williams – ADU / Garage
2. Name of applicant:
Jamie Williams and Patty Thumann
3. Address and phone number of applicant and contact person:
13411 SE 151st St Renton WA 98058
206-819-6588 Jamie Williams
253-442-7681 Patty Thumann
4. Date checklist prepared:
12/26/24
5. Agency requesting checklist:
City of Renton – as part of the Master Application process to add and ADU / Garage on
property
6. Proposed timing of schedule (including phasing, if applicable):
Hopefully we can start in the Spring 2025 and finish by Fall 2025.
7. Do you have any plans for future additions, expansion, or further activity related to or
connected with this proposal? If yes, explain.
This application is being done as part of the Williams ADU / Garage project. No other
projects are needed / planned.
8. List any environmental information you know about that has been prepared, or will be
prepared, directly related to this proposal.
We have had the following reports completed in preparation for this project.
1. Channel Migration Study
2. Geotechnical Study
3. Wetland and Stream Assessment
4. Drainage Report
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.
No
10. List any government approvals or permits that will be needed for your proposal, if known.
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None are known at this time.
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.)
We are planning to build a separate garage with living unit above (ADU) with 2 bedrooms
and bathroom. The square footage is planned to be 980 SF. The building will be used for
extra vehicles (trailer and boat) and for visiting relatives. We do not plan to rent out the
ADU.
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 location of the ADU/Garage will be behind the existing residence and the driveway will
be to the side of the house where an existing gate is located. The new building will be close
to the existing house because it must be outside of the 100-year flood zone. This is shown
on the site plan. The site plan also takes into account boundaries with the neighbors
property. [Site plan is attached with this SEPA Checklist]
B. Environmental Elements
1. Earth
Find help answering earth questions3
a. General description of the site:
There are no wetlands on or visible from the subject property. The property is primarily
lawn grass between the house patios and the streambank of the Cedar River. The soils
are Pilchuck fine sandy, which is a non-hydric fluvial soil that does not meet the criteria
for a hydric soil. The elevation from the river to the house is gradual, 68’ by the river
and 76’ by the location of the planned ADU.
Circle or highlight one: Flat, rolling, hilly, steep slopes, mountainous, other:
As stated above, the elevation from river to planned location of the house is 8’. This elevation is
gradual over a 200’+ distance from the river. Site Plan shows the elevation from river to
planned site.
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b. What is the steepest slope on the site (approximate percent slope)?
There is a 2’ incline by the river and then there is a gradual slope up to the proposed
site, appr. 200’+ from the river shore.
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 soils are Pilchuck fine sandy, which is a non-hydric fluvial soil that does not meet the
criteria for a hydric soil. The taxonomic classification is Mixed, Mesic Dystric
Xeropsamments. The typical Pedon “A” horizon depth is 0-20 inches of sand. The
drainage classification is “somewhat excessively drained”. Soils color are 10YR 4/3, as
determined with a Munsell color chart in the field. [From the Wetland and Stream
Assessment dated 11/20/21].
d. Are there surface indications or history of unstable soils in the immediate vicinity? If
so, describe.
We do not know of any history of unstable soils by the property. There is a hillside
across the river from the house that is monitored by a public agency.
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 construction area will be over 200’ from the river edge by the current resident
house. The proposed Garage / ADU will be apprx. 980 SF (35’x28’). There will be no
basement, just cement slab.
f. Could erosion occur because of clearing, construction, or use? If so, generally describe.
There should not be any erosion since the construction site is over 200’ from the river
bank.
g. About what percent of the site will be covered with impervious surfaces after project
construction (for example, asphalt or buildings)?
The current plot is 37,744 SF. The planned building is 980 SF. That results in 2.6% of the
property. All other surfaces on the site (residence, driveway and concrete paving) equal
approx.. 5000 SF equals approx.. 13.25%.
h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any.
We have planned the building outside of the 100 flood plan and over 200’ away from
the river.
SEPA Environmental checklist September 2023 Page 5
(WAC 197-11-960)
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.
We will be using general construction methods and the only machines used will be to
clear the area for the concrete slab and moving in the materials.
b. Are there any off-site sources of emissions or odor that may affect your proposal? If
so, generally describe.
Not to our knowledge. We are not asking for any special materials that would require
special processing.
c. Proposed measures to reduce or control emissions or other impacts to air, if any:
We have not planned for any special controls since the construction size is limited and
using standard materials.
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.
No. The construction site is over 200’ away from the river site.
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.
None.
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4. Will the proposal require surface water withdrawals or diversions? Give a 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:
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
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.
The current septic system will be replaced with a new septic system, the design has
been submitted to the City of Renton as part of our application paperwork.
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.
The first feasible BMP is to mitigate runoff from the proposed impervious areas of
Full Infiltration via an infiltration drywell. This drywell will catch flows from the
proposed rooftop as well as the proposed driveway. Per the requirement for Full
Infiltration, pollution generating impervious surfaces may be part of the contributing
surface runoff to the infiltration facility if said runoff is treated for water quality.
There are no other feasible BMPs to mitigate runoff from the proposed driveway due
to site constraints (buffers, geometry etc…). Thus, although water quality treatment
is not required per the core requirements criteria, it is required since we are routing
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pollution generating runoff to an infiltration facility. As such, a Contech storm filter
catch basin is proposed to be placed in the proposed driveway to collect runoff, treat
it, and then release it into the proposed drywell for Full Infiltration. [From Drainage
Report dated 12/17/24].
2. Could waste materials enter ground or surface waters? If so, generally describe.
Routing pollution generating runoff to an infiltration facility. As such, a Contech
storm filter catch basin is proposed to be placed in the proposed driveway to collect
runoff, treat it, and then release it into the proposed drywell for Full Infiltration.
[From Drainage Report dated 12/17/24].
3. Does the proposal alter or otherwise affect drainage patterns in the vicinity of the
site? If so, describe.
Drainage proposed will only effect the residence of applicants, no effect on
neighboring properties.
d. Proposed measures to reduce or control surface, ground, and runoff water, and
drainage pattern impacts, if any:
An infiltration drywell will catch flows from the proposed rooftop as well as the
proposed driveway.
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
☐ 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?
Two fir trees will need to be removed since the only place we can put the building due
to the 100 year flood zone is where the 2 fir trees are located.
c. List threatened and endangered species known to be on or near the site.
SEPA Environmental checklist September 2023 Page 8
(WAC 197-11-960)
None known
d. Proposed landscaping, use of native plants, or other measures to preserve or enhance
vegetation on the site, if any.
We have planted numerous evergreen type of trees near the river bank and along the
side of the property.
e. List all noxious weeds and invasive species known to be on or near the site.
None known
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.
Examples include:
• Birds: hawk, heron, eagle, songbirds, other:
• Mammals: deer, bear, elk, beaver, other:
• Fish: bass, salmon, trout, herring, shellfish, other:
Eagles and hawks are known to fly along the river.
Salmon migrate up the Cedar River during the year.
b. List any threatened and endangered species known to be on or near the site.
None known.
c. Is the site part of a migration route? If so, explain.
No, proposed site is just out of the 100 year flood plain.
d. Proposed measures to preserve or enhance wildlife, if any.
None needed
e. List any invasive animal species known to be on or near the site.
None that are known.
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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Electricity will be used for heating and power.
b. Would your project affect the potential use of solar energy by adjacent properties? If
so, generally describe.
No plan for this at this time
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.
No plan at this time
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.
1. Describe any known or possible contamination at the site from present or past
uses.
No known contamination
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.
No existing hazardous chemicals / conditions
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.
No hazardous chemicals will be stored on property during the project
4. Describe special emergency services that might be required.
None are identified
5. Proposed measures to reduce or control environmental health hazards, if any.
None needed at this time
b. Noise
1. What types of noise exist in the area which may affect your project (for example:
traffic, equipment, operation, other)?
No noise issues
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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)?
Construction will be the only noise and will only be during normal hours appropriate
to the neighborhood
3. Proposed measures to reduce or control noise impacts, if any:
Work hours will be suitable for the area. 8am – 5pm.
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 and area are currently residential
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?
No
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 main residence and a work shed for lawn tools.
d. Will any structures be demolished? If so, what?
No
e. What is the current zoning classification of the site?
R-4
f. What is the current comprehensive plan designation of the site?
Site is currently residential.
g. If applicable, what is the current shoreline master program designation of the site?
We do not have a current shoreline master program for this site.
11 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist-
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h. Has any part of the site been classified as a critical area by the city or county? If so,
specify.
Channel Migration Zone report has been completed due to the 100 year flood zone on
the property. The site selection for the building is outside this 100 year flood zone.
[Attached Channel Migration Zone report]
i. Approximately how many people would reside or work in the completed project?
No permanent residents or workers planned
j. Approximately how many people would the completed project displace?
None
k. Proposed measures to avoid or reduce displacement impacts, if any.
None needed since we are not displacing anyone.
l. Proposed measures to ensure the proposal is compatible with existing and projected
land uses and plans, if any.
The area is residential and will remain residential
m. Proposed measures to reduce or control impacts to agricultural and forest lands of
long-term commercial significance, if any:
There are none in the area to impact.
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.
ADU / Garage for current resident, not to be rented
b. Approximately how many units, if any, would be eliminated? Indicate whether high,
middle, or low-income housing.
None will be eliminated
c. Proposed measures to reduce or control housing impacts, if any:
This building is not for additional housing other than current residents
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?
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Proposed building is planned to be 24’ height, with an additional 6’ for roof pitch.
b. What views in the immediate vicinity would be altered or obstructed?
None
c. Proposed measures to reduce or control aesthetic impacts, if any:
None, design is complimentary to current residence.
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?
No specific light during construction since it will be done through the daytime period
and limited light on-going since it is not the main residence.
b. Could light or glare from the finished project be a safety hazard or interfere with
views?
This building does not effect any other house views or become a safety hazard.
c. What existing off-site sources of light or glare may affect your proposal?
This building is in our backyard where there is only motion lights currently.
d. Proposed measures to reduce or control light and glare impacts, if any:
No plan for glare or bright lights.
12. Recreation
Find help answering recreation questions
a. What designated and informal recreational opportunities are in the immediate
vicinity?
None
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 needed
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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.
No
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.
No
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.
None needed
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.
None needed
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 access to the building will be off of SE 151st St Renton. There is already a gate and
space for the driveway. This does not affect any other property.
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?
No
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).
No
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d. Will the project or proposal use (or occur in the immediate vicinity of) water, rail, or
air transportation? If so, generally describe.
No
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?
Less than one per day. The garage will house a trailer and boat which are used on a
limited basis during parts of the year.
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.
No
g. Proposed measures to reduce or control transportation impacts, if any:
None needed
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.
No. Part of the required plan is to have fire suppression equipment in the garage.
b. Proposed measures to reduce or control direct impacts on public services, if any.
None needed
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:
Water is from private community well. New septic system will be installed as part of
project.
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.
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Water and electricity are the only utilities needed for the project. The septic will be
attached to the new septic system installed for both the main house and the new
building.
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.
Recoverable Signature
X Patricia Thumann
Signed by: 2b53dbea-b208-44b7-85fd-b97fb67f694c
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?
The building is primarily a garage and excess living space when needed for family visits. The
only water discharge is rain runoff and there will be no toxic or hazardous substances. The
only noise will be normal living conditions.
• Proposed measures to avoid or reduce such increases are:
Filters that will be installed to treat the rain runoff.
19 https://ecology.wa.gov/Regulations-Permits/SEPA/Environmental-review/SEPA-guidance/SEPA-checklist-
guidance/SEPA-Checklist-Section-C-Signature
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 16
(WAC 197-11-960)
How would the proposal be likely to affect plants, animals, fish, or marine life?
No affect on animals, fish or marine life. We will need to take down two trees.
• Proposed measures to protect or conserve plants, animals, fish, or marine life are:
We will be planting additional trees along the edge of the property.
2. How would the proposal be likely to deplete energy or natural resources?
This property will not be used as a main residence, so energy use is limited.
• Proposed measures to protect or conserve energy and natural resources are:
Will continue to use correct lighting appropriate for the area.
3. 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?
No affect
• Proposed measures to protect such resources or to avoid or reduce impacts are:
None needed
4. 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 ?
The project is over 200’ away from the river shoreline
• Proposed measures to avoid or reduce shoreline and land use impacts are:
Far enough away from river shoreline
5. How would the proposal be likely to increase demands on transportation or public
services and utilities?
No impact.
• Proposed measures to reduce or respond to such demand(s) are:
None needed
6. Identify, if possible, whether the proposal may conflict with local, state, or federal laws
or requirements for the protection of the environment.
No conflict. The site is far enough away from the river and there are no other protected
areas.