HomeMy WebLinkAboutD_Hyatt Regency Lake Washington Splices_FINALDEPARTMENT OF COMMUNITY
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Hyatt Regency-Lake Washington Splices_SMED_Hyatt Regency Lake Washington Splices_FINAL_20251110
PLANNING DIVISION
CERTIFICATE OF EXEMPTION
FROM SHORELINE SUBSTANTIAL DEVELOPMENT
EVALUATION FORM & DECISION
DATE OF DECISION: November 10, 2025
PROJECT NUMBER: LUA25-000388, SME
PROJECT NAME: Hyatt Regency-Lake Washington Splices
PROJECT MANAGER: Jill Ding, Senior Planner
OWNER: Scott Lane, Hyatt Regency
1053 Lake Washington Blvd N, Renton, WA 98056
CONTACT: Mark Kushino, Waterfront Construction, Inc.
205 NE Northlake Way, Ste 230, Seattle, WA 98105
PROJECT LOCATION: 1053 Lake Washington Blvd N, Renton, WA 98056
PROJECT DESCRIPTION: The applicant is requesting a Shoreline Exemption to repair eleven (11) existing
piles using bonnet splices underneath an existing 2,167-square-foot pier that serves the Hyatt Regency Hotel
at Southport (APN 0523059075) and the Bristol at Southport (APN 0523059076) (Attachment A). All work
would be completed in Lake Washington, in water depths ranging from ten to fifteen feet (10 - 15’), and would
occur in the upper five feet (5’) of the water column. Bonnet splicing requires removal of up to three feet (3’)
of the tops of piles. A steel section is added to the top of the pile by placing plates (that would be bolted down)
around the top of the remaining pile. A six-inch (6") epoxy coated steel pile section is then bolted to the steel
plates and fastened to the cap beam. Eight (8) derelict piles would also be permanently removed. The existing
pier provides moorage for hotel guests, and a place for guests to access the shoreline while staying at the
hotel. During construction, a floating boom would be installed to surround the work barge, pier, and work
area to contain any floating debris that may escape during construction. In addition, the barge will have a
perimeter containment sock to absorb oil and grease that may wash from the barge during construction. The
proposed work would be completed during the prescribed in-water work window for this area of Lake
Washington (July 16 to December 31). The Hyatt Regency Hotel is located within the Shoreline High Intensity
Designation, and the pier is located within the Aquatic Designation of Lake Washington (Reach H). Lake
Washington is classified as a Shoreline of the State, subject to the Shoreline Management Act.
SEC-TWN-R: NW 08-23-05
LEGAL DESCRIPTIONS:
(King County Assessor)
"NEW LOT A" CITY OF RENTON LOT LINE ADJUSTMENT NO LUA14-001514
(SOUTHPORT LOT LINE ADJUSTMENT) RECORDING NO 20141223900010 (BEING
A PORTION OF SW QTR SW QTR STR 05-23-05 AND OF NW QTR NW QTR STR 08-
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
City of Renton Department of Community & Economic Development Certificate of Exemption From Shoreline Substantial Development
Hyatt Regency-Lake Washington Splices LUA25-000388, SME
Permit Date: November 10, 2025 Page 2 of 3
Hyatt Regency-Lake Washington Splices_SMED_Hyatt Regency Lake Washington Splices_FINAL_20251110
23-05)
LOT 2 OF CITY OF RENTON LOT LINE ADJUSTMENT NO LUA 99-134-SHPL
RECORDING NO 20000131900006 BEING PARCEL B OF CITY OF RENTON LOT
LINE ADJUSTMENT NO LUA 98-176 LLA RECORDING NO 9902019014 BEING A
PORTION OF GOV LOT 1 IN NW 1/4 OF SECTION 08-23-05 LY NLY & WLY OF
BURLINGTON NORTHERN RAILROAD CO R/W AND PORTION OF LAKE
WASHINGTON SHORELANDS IN SW 1/4 OF SECTION 05-23-05
WATER BODY/REACH: Lake Washington, Reach H
SHORELINE EXEMPTION FINDINGS:
The proposed development is consistent with the following findings:
YES i. Consistent with the policies of the Shoreline Management Act.
Staff Comments: The proposed repair of eleven (11) piles using bonnet splices and the
removal of eight (8) derelict piles from an existing pier would qualify as maintenance
and repair to an existing structure and would be exempt from a Shoreline Substantial
Development Permit under the Shoreline Management Act.
YES ii. Not Applicable to the guidelines of the Department of Ecology where no Master
Program has been finally approved or adopted by the Department.
Staff Comments: Not applicable as the City of Renton has adopted a Shoreline Master
Program.
YES iii. Consistent with the City of Renton Shoreline Mater Program.
Staff Comments: The proposed maintenance and repair of an existing pier would be
consistence with the policies of the City of Renton Shoreline Master Program. In
addition, a Lake Study/No Net Loss Determination, prepared by Northwest
Environmental Consulting, LLC, dated September 2025 (Attachment B), was submitted
with the project application. It was concluded that the proposal would use Best
Management Practices (BMPs) and conservation measures to reduce project impacts.
The repairs minimize impacts by pile splicing, which does not require driving of new
piles, and no new overwater coverage is proposed. The maintenance repairs are the
minimum necessary to complete the work. It was concluded that the proposed project
would result in no net loss of ecological functions at the site.
In addition, a Stormwater Technical Information Report (TIR) (Attachment D) and a
Construction Stormwater Pollution Prevention Plan (CSWPPP) (Attachment E), both
prepared by Pacific Stormwater Solutions, LLC, dated October 13, 2025, were
submitted with the project application materials. The submitted reports were reviewed
by the City’s Development Engineering Division, which had no comments on the
submitted information; however, it was noted that a Construction Permit would be
required for the proposed maintenance work.
EXEMPTION JUSTIFICATION/DECISION: An exemption from a Shoreline Management Substantial
Development Permit is hereby Approved on the proposed project in accordance with RMC 4-9-190C
“Exemptions from Permit System” and for the following reasons:
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
City of Renton Department of Community & Economic Development Certificate of Exemption From Shoreline Substantial Development
Hyatt Regency-Lake Washington Splices LUA25-000388, SME
Permit Date: November 10, 2025 Page 3 of 3
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Normal maintenance or repair of existing structures or developments, including damage by accident, fire or
elements. "Normal maintenance" includes those usual acts to prevent a decline, lapse, or cessation from a
lawfully established condition. "Normal repair" means to restore a development to a state comparable to its
original condition, including but not limited to its size, shape, configuration, location and external
appearance, within a reasonable period after decay or partial destruction, except where repair causes
substantial adverse effects to shoreline resource or environment. Replacement of a structure or development
may be authorized as repair where such replacement is the common method of repair for the type of structure
or development and the replacement structure or development is comparable to the original structure or
development including but not limited to its size, shape, configuration, location and external appearance and
the replacement does not cause substantial adverse effects to shoreline resources or environment.
SIGNATURE & DATE OF DECISION:
______________________________________________ _______________________________________
Matthew Herrera, Planning Director Date
RECONSIDERATION: Within 14 days of the decision date, any party may request that the decision be
reopened by the approval body. The approval body may modify his decision if material evidence not readily
discoverable prior to the original decision is found or if he finds there was misrepresentation of fact. After
review of the reconsideration request, if the approval body finds sufficient evidence to amend the original
decision, there will be no further extension of the appeal period. Any person wishing to take further action
must file a formal appeal within the 14-day appeal time frame.
APPEALS: This administrative land use decision will become final if not appealed in writing to the
Hearing Examiner on or before 5:00 PM on November 24, 2025. An appeal of the decision must be filed
within the 14-day appeal period (RCW 43.21.C.075(3); WAC 197-11-680). Appeals must be submitted
electronically to the City Clerk at cityclerk@rentonwa.gov or delivered to City Hall 1st floor Lobby Hub
Monday through Friday. The appeal fee, normally due at the time an appeal is submitted, will be collected at
a future date if your appeal is submitted electronically. The appeal submitted in person may be paid on the
first floor in our Finance Department. Appeals to the Hearing Examiner are governed by RMC 4-8-110 and
additional information regarding the appeal process may be obtained from the City Clerk’s Office,
cityclerk@rentonwa.gov.
EXPIRATION: Two (2) years from the date of decision (date signed).
ATTACHMENTS:
Attachment A: Plan Set
Attachment B: Lake Study/No Net Loss Determination, prepared by Northwest Environmental Consulting,
LLC, dated September 2025
Attachment C: Project Narrative
Attachment D: Stormwater Technical Information Report (TIR), prepared by Pacific Stormwater Solutions,
LLC, dated October 13, 2025
Attachment E: Construction Stormwater Pollution Prevention Plan (CSWPPP), prepared by Pacific
Stormwater Solutions, LLC, dated October 13, 2025
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11/10/2025 | 12:13 PM PST
Waterfront Construction Inc.
ATTACHMENT A
RECEIVED
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PLANNING DIVISIONDocusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Waterfront Construction Inc.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Waterfront Construction Inc.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Waterfront Construction Inc.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Waterfront Construction Inc.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Waterfront Construction Inc.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Hyatt Regency at Southport
Lake Study/No Net Loss Determination
Prepared for
Hyatt Regency
1053 Lake Washington Boulevard NW
Renton, WA 98056
Prepared by
Northwest Environmental Consulting, LLC
3639 Palatine Avenue North
Seattle, WA 98103
206-234-2520
September 2025
ATTACHMENT B
RECEIVED
11/05/2025 jding
PLANNING DIVISION
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Hyatt Regency at Southport
Lake Study 1
Project Purpose
The project purpose is to repair 11 piles using bonnet splices at the hotel pier in Lake
Washington and remove an additional 8 derelict piles.
Location
The subject property is located at 1053 Lake Washington Boulevard NW (King County parcel
number 0523059076) in the City of Renton, Washington (Sheet 1). The parcel is on the
waterfront of Lake Washington.
Project Description
The proposed work is to repair 11 piles using bonnet splices, under a 2,167-square-foot pier
that serves the Hyatt Regency hotel. All work will be completed in water 10 to 15 feet deep and
occur in the upper 5 feet of the water column. Bonnet splicing requires removal of up to 3 feet
of the tops of piles. A steel section is added to the top of the pile by placing plates around the
top of the remaining pile and though bolting. A 6-inch epoxy coated steel pile section is then
bolted to the steel plates and fastened to the cap beam. 8 derelict piles will also be permanently
removed.
The pier provides moorage for hotel guests, and a place for guests to enjoy shoreline access
while staying at the hotel.
During construction, a floating boom will surround the work barge, pier, and work area.
Project drawings are included in Appendix A – Project Drawings.
Approach
Northwest Environmental Consulting LLC (NWEC) biologist Brad Thiele conducted a site visit in
August 2025 to evaluate conditions on site and adjacent to the site. NWEC also consulted the
following sources for information on potential critical fish and wildlife habitat along this shoreline:
• City of Renton COR Maps online database
(https://rp.rentonwa.gov/HTML5Public/Index.HTML?viewer=CORMaps)
• Washington State DNR Natural Heritage Features database
(https://www.dnr.wa.gov/publications/amp_nh_trs.pdf?znn6z)
• Washington Department of Fish and Wildlife (WDFW): Priority Habitats and Species
online database (http://apps.wdfw.wa.gov/phsontheweb/)
• WDFW SalmonScape online database of fish distribution and ESA listing units
(https://apps.wdfw.wa.gov/salmonscape/)
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Hyatt Regency at Southport
Lake Study 2
Site Description
The subject property is a shoreline tract in urban Renton, between the Boeing Renton Facility
and Gene Coulon Memorial Park. It has shoreline on its northern boundary with the hotel
landward, office buildings to the south, industrial buildings to the west, and condominiums to the
east.
The hotel property is fully built out, with a parking lot and adjacent buildings. The shoreline is
bulkheaded with concrete. Some mowed grass and ornamental shrubs exist on the hotel site.
The nearest shoreline vegetation is on Bird Island in Gene Coulon Memorial Park, east of the
site, and on the Boeing Facility shoreline west of the site.
The substrate of the lake is sand, gravel, and cobble. Euarasian milfoil (an invasive species)
was present at the time of the site visit. The Cedar River enters Lake Washington a half-mile
west of the hotel, along the western boundary of the Boeing facility.
Adjacent multi-family residential properties to the east and west have shared-use docks.
Lake and Stream Classifications
As a Shoreline of Statewide Significance (RMC 4-3-090B1) Lake Washington is defined as a
Shoreline of the State (RMC 4-11-190S). The Shoreline is designated as “Urban Center-2” (City
of Renton 2025) (Figure 1). No streams are present within 500 feet of the site.
Ordinary High Water Mark
The Ordinary High Water Mark (OHWM) for Lake Washington is the line of mean high water
(RMC 4-11-150 Definitions O). The Lake Washington water depth is controlled by the Army
Corps of Engineers at the Hiram M. Chittenden Locks and is at 21.8 feet above sea level (Corps
of Engineers Datum). The OHWM at the project site is shown in Appendix A – Project Drawings.
Vegetative Cover of the Site
There are no wetlands or floodplains mapped as occurring in the study area. There are no DNR
Natural Heritage Features listed in the study area (Figure 2). The site is maintained as a hotel
property with some street scaping. The site is generally paved and the water front is a paved
promenade.
Ecological Functions of Lake Washington at Site.
The site lacks native plantings that would provide habitat functions along the shoreline. There is
no plantable area along the shoreline. The nearest shoreline vegetation is on Bird Island at
Gene Coulon Memorial Park, and on the Boeing Facility’s shoreline to the west.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Hyatt Regency at Southport
Lake Study 3
Species Use
Birds
Birds observed near the site include raptors, herons, eagles, waterfowl, and songbirds. Bald
eagles, protected by the Bald and Golden Eagles Protection Act and the Migratory Bird Treaty
Act, are protected as a “sensitive species” within the state of Washington (WAC 232-12-011).
Eagles were not observed in the area during the site study and no nest or adequate nesting
trees were visible along the shoreline. Bald eagles and other raptors are common on along the
shoreline of Lake Washington. Bird Island, less than a half mile to the east, supports many
native birds.
Mammals
No wild mammals were observed during the site visit, but Lake Washington is known to have
river otters, beavers, nutrias, and muskrats. Deer and coyotes are known to be present in the
vicinity; however, the hotel is in a highly urbanized area and presence of any mammals is
unlikely outside the park.
Fish
WDFW’s PHS mapping and SalmonScape mapping tools show the following salmonid species
using Lake Washington for migration and/or rearing: residential coastal cutthroat (Oncorhynchus
clarki), winter steelhead (O. mykiss), Dolly Varden/bull trout (Salvelinus malma), sockeye
salmon (O. nerka), fall Chinook (O. tshawytscha), coho salmon (O. kisutch), and kokanee (O.
nerka). The Salmonscape database maps the site as critical habitat to the Evolutionarily
Significant Unit (ESU) of Threatened Chinook and steelhead (Figure 3). Fall Chinook salmon
and winter steelhead are mapped as rearing in the first mile of the Cedar River, and spawning
upriver. Coho salmon are mapped as rearing in the first few hundred feet of the Cedar River,
and spawning upriver. Sockeye and kokanee are mapped as present in the first few miles of the
river, then spawning upriver. Bull trout are mapped as present in the river, and rearing in Lake
Washington.
The nearest salmon stream is the Cedar River, which enters the lake a half mile west of the
project area on the western edge of the Boeing facility. The project site is accessible to any fish
migrating or rearing in the lake, and Lake Washington is designated as critical habitat for
Endangered Fall Chinook salmon. A small stream enters the lake in Gene Coulon Memorial
Park. City mapping designates this as a Fish stream, but SalmonScape does not show
presence of salmonids.
There is wetland mapped west of the site, on the Boeing property shoreline (Figure 4).
Measures to Protect Trees and Vegetation
No trees will be disturbed during construction as all work will occur in-water and from the work
barge. No vegetation will be removed.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Hyatt Regency at Southport
Lake Study 4
Project Impacts and Conservation Measures
Direct Impacts:
Sediments: Sediment disturbance will occur below the OHWM and along the shoreline of Lake
Washington. Additionally, the tug and barge propwash may disturb sediments temporarily when
making trips to/from the site. Juvenile salmonids could be temporarily displaced or stressed by
increased turbidity. Impacts to sediments should be minimal from pile work and the project
actions are not expected to exceed State Water Quality Standards.
Pile stub repairs are minimally invasive and do not require any disturbance of sediments. All
work is completed in the upper portion of the water column.
Lakebed: The proposed project will not affect the lake bed. All pile stubbing will be completed
to the upper 3 feet of the piling.
Noise: Construction equipment will create noise audible to neighbors and in-water. Noise
disturbance from the underwater chain saw will be short-term, and similar to that of vessel
motors. This noise will have negligible effects on fish and wildlife in the area. Work will be
completed during the in-water work window when juvenile fish are not expected to be present.
Potential spills: Short-term risks include the potential for petroleum spills that can occur with
any equipment operation. The chance of impact to the aquatic environment is reduced because
a crew trained in using spill containment measures will be on site and employ these measures
should a spill occur.
Indirect Impacts:
Recreational Boating: The project supports continued recreational boating, which has been
identified as a limiting factor for salmonid populations in Lake Washington. The pile repairs will
preserve existing moorage capacity in Lake Washington.
Other Conservation measures:
Work window: The work will be completed during the prescribed in-water work window for this
area of Lake Washington (July 16 to December 31). Operating within this time frame helps
protect Chinook salmon, steelhead, bull trout and other salmonid fish species.
Best Management Practices: Applicable BMPs will be used such as a floating boom around
the in-water work area to contain any floating debris that may escape during construction. The
barge will have a perimeter containment sock to absorb oil and grease that may wash from the
barge during construction.
Hazardous material containment materials such as spill absorbent pads and trained personnel
will be required onsite during any phase of construction where machinery is in operation near
surface waters.
Mitigation Strategy
Avoidance and Minimization
Impacts to Lake Washington cannot be avoided. The project has been designed to reduce
impacts by using BMPs to reduce potential impacts from construction. The repairs minimize
impacts by pile splicing, which does not require driving of new piles, and no new overwater
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Hyatt Regency at Southport
Lake Study 5
coverage is proposed. The maintenance repairs are the minimum necessary to complete the
work.
Mitigation Approach
The proposal will remove 8 derelict piles from the area. All wood piles under the pier are
untreated.
The owner has opted to pay the required in-lieu fee to King County to complete the mitigation
requirements as required by the National Marine Fisheries Service using the RAP process. The
City of Renton has not codified in lieu mitigation as an option for the project.
Shoreline Function and Values
Project activities will not affect shoreline functions. The proposal is for a maintenance of an
existing structure.
Conclusion
Juvenile Chinook salmon, and other salmonids, rear and migrate along the Lake Washington
shoreline.
There will be temporary impacts from noise and disturbed sediments during installation of the
pilings to construct the new docks.
The project will minimize construction effects on the environment by following the prescribed in
water work window and use applicable BMPs to prevent construction spills and debris from
escaping the area.
The long-term effects of the repair consist of removing 8 derelict untreated piles from the water
column.
This project has been designed to meet current residential dock standards and will use Best
Management Practices to reduce project impacts. The conservation measures are designed to
preserve ecological functions or prevent further degradation of habitat and will result in No Net
Loss of ecological functions at the site.
Document Preparers
Brad Thiele Biologist 31 years of experience NWEC
Kristin Noreen Permit Specialist 26 years of experience NWEC
The conclusions and findings in this report are based on field observations and measurements
and represent our best professional judgment and to some extent rely on other professional
service firms and available site information. Within the limitations of project scope, budget,
and seasonal variations, we believe the information provided herein is accurate and true to
the best of our knowledge. Northwest Environmental Consulting does not warrant any
assumptions or conclusions not expressly made in this report, or based on information or
analyses other than what is included herein.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Hyatt Regency at Southport
Lake Study 6
REFERENCES
City of Renton. 2025. COR Maps. Accessed August 2025 at
https://maps.rentonwa.gov/Html5viewer/Index.html?viewer=CORMaps.
City of Renton Municipal Code (RMC). 2021. RMC Section 4-8-120. Code Publishing. Accessed
August 2025 at
https://www.codepublishing.com/WA/Renton/#!/Renton04/Renton0408/Renton0408120.
html
Washington Department of Fish and Wildlife (WDFW). 2025. Priority Habitats and Species.
Online database. Accessed August 2025 at http://apps.wdfw.wa.gov/phsontheweb/
WDFW. 2021. SalmonScape. Online database. Accessed August 2025 at
http://apps.wdfw.wa.gov/salmonscape/
Washington State Department of Natural Resources. 2025. Sections that Contain Natural
Heritage Features. Accessed August 2025 at
https://www.dnr.wa.gov/publications/amp_nh_trs.pdf?znn6z
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Appendix A:
Project Drawings
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Waterfront Construction Inc.
NWS-2025-437
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Waterfront Construction Inc.
NWS-2025-437
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Waterfront Construction Inc.
NWS-2025-437
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Waterfront Construction Inc.
NWS-2025-437
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Waterfront Construction Inc.
NWS-2025-437
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Waterfront Construction Inc.
NWS-2025-437
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Appendix B:
Figures
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Figure 1 City of Renton Critical Areas Map
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Figure 2 DNR Natural Heritage Map
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Figure 3 SalmonScape Map
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8/19/25, 5:05 PM PHS Report
about:blank 2/4Figure 4: PHS Map and Report p1
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
PHS Species/Habitats Overview:
Occurence Name Federal Status State Status Sensitive Location
Freshwater Forested/Shrub
Wetland N/A N/A No
Freshwater Forested/Shrub Wetland
Priority Area Aquatic Habitat
Site Name N/A
Accuracy NA
Notes Wetland System: Freshwater Forested/Shrub Wetland - NWI Code:
PSS1/FO1Ch
Source Dataset NWIWetlands
Source Name Not Given
Source Entity US Fish and Wildlife Service
Federal Status N/A
State Status N/A
PHS Listing Status PHS Listed Occurrence
Sensitive N
SGCN N
Display Resolution AS MAPPED
ManagementRecommendations http://www.ecy.wa.gov/programs/sea/wetlands/bas/index.html
Geometry Type Polygons
DISCLAIMER. This report includes information that the Washington Department of Fish and Wildlife (WDFW) maintains in a central computer database. It is not an attempt to provide you
with an official agency response as to the impacts of your project on fish and wildlife. This information only documents the location of fish and wildlife resources to the best of our knowledge.
Report Date: 08/19/2025
PHS Species/Habitats Details:
8/19/25, 5:05 PM PHS Report
about:blank 3/4Figure 4: PHS Map and Report p2
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Appendix C:
Site Photographs
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Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Updated 5/9/25
Waterfront Construction, Inc
Project Description & Construction Sequence
Hyatt Regency - Lake Washington Splices
A. Project Location
The project is a commercial multi-occupant hotel on the south side of Lake Washington in the UC-2 zone, presently operating as a hotel. The project lot size is 239195 s/f. The project site is located at 1053 Lake Washington Blvd N, Renton, WA 98056. The property is situated in the NW Quarter of Section 8, Township 23, Range 05 at 47.5029 N Latitude and -122.2050 W Long. Tax Lot# 052305-9075. B. Project Description Conduct eleven (11) pile splices to existing float pier, per plan. Remove eight (8) derelict piles. No excavation or fill is proposed.
C. Construction Technique & Sequencing 1. Pre-Fabrication Splices will be fabricated in the contractor’s Seattle yard and will be epoxy coated. All construction materials will be loaded onto the crane barge in the contractor’s Seattle yard and transported to the site for installation.
2. Site Preparation
This site requires no preparation prior to construction. 3. Onsite Construction 1) Mobilization of crane and utility barge; 2) Remove eight (8) derelict piles; 3) Splice eleven (11) internal float piles;
o All splices will be prefabricated at contractor’s Seattle shop.
o Divers will install all splices using hand tools under the building.
o Splices are secured with ¾ inch through bolts and batters will be attached to vertical piles. 4) All old wood piles will be hauled out and discarded in an approved upland renew container.
4. Equipment used All construction equipment and materials used in this project will be stationed on the construction barge.
ATTACHMENT C
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Updated 5/9/25
5. Materials used
Metal will be epoxy-coated HDG or stainless hardware.
6. Work Corridor The construction barge will operate offshore to avoid bottom and shoreline disturbances that could occur with ground-based equipment. All staging will take place on the barge.
7. Staging Area
The barge will hold all construction materials during the project and all construction debris will be held in a 20 c/y steel debris container that is secured on the barge for upland disposal later.
8. Running of Equipment During Construction Equipment will be running off and on during the construction phase, only when required, and only during allowed work hours.
9. Clean-Up
All construction debris will be removed and loaded into a 20 c/y steel debris container secured on the construction barge during construction. Debris is then transported by barge to the contractor’s Seattle yard, off-loaded, and shipped to an approved upland disposal site. 10. Project Timing All proposed construction will take place during daylight hours in approved work windows unless work needs to be coordinated with evening hours to facilitate construction in the approved work window.
11. Duration of Construction
On site construction will take two weeks.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Hyatt Regency – Lake Washington Splices
Stormwater Technical Information Report
October 13, 2025
Prepared for:
Hyatt Regency Lake Washington
1053 Lake Washington Boulevard N
Renton, Washington 98056
Prepared by:
Kevin Cline, CESCL
David Farr, P.E.
ATTACHMENT D
RECEIVED
11/05/2025 jding
PLANNING DIVISION
David Farr, PE
Digitally signed by David
Farr, PE
DN: C=US,
E=farr@pacificsws.com,
O="Pacific Stormwater ",
CN="David Farr, PE"
Date: 2025.10.15
12:07:00-04'00'
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This page has been left intentionally blank.
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TABLE OF CONTENTS
Figures (in text) ..................................................................................................................................... v
Appendices ........................................................................................................................................... v
Acronyms and Abbreviations .............................................................................................................. vi
Disclaimer ............................................................................................................................................ vii
1 Introduction .................................................................................................................................. 1
1.1 Project Overview .................................................................................................................. 1
2 Conditions and Requirements Summary .................................................................................... 7
2.1 Core Requirement #1 – Discharge at the Natural Location .............................................. 7
2.2 Core Requirement #2 – Offsite Analysis ............................................................................. 7
2.3 Core Requirement #3 – Flow Control Facilities ................................................................. 7
2.4 Core Requirement #4 – Conveyance System ..................................................................... 7
2.5 Core Requirement #5 – Construction Stormwater Pollution Prevention ......................... 7
2.6 Core Requirement #6 – Maintenance and Operations ..................................................... 7
2.7 Core Requirement #7 – Financial Guarantees and Liability .............................................. 7
2.8 Core Requirement #8 – Water Quality ............................................................................... 8
2.9 Special Requirement #1 – Other Adopted Area-Specific Requirements ......................... 8
2.10 Special Requirement #2 – Flood Hazard Area Delineation .............................................. 8
2.11 Special Requirement #3 – Flood Protection Facilities ....................................................... 9
2.12 Special Requirement #4 – Source Controls ........................................................................ 9
3 Offsite Analysis ............................................................................................................................. 9
4 Flow Control, Low Impact Development, and Water Quality Facility Analysis and Design . 10
4.1 Existing Site Hydrology ..................................................................................................... 10
4.2 Developed Site Hydrology ................................................................................................ 10
4.3 Performance Standards ..................................................................................................... 10
4.4 Flow Control System .......................................................................................................... 10
4.5 Water Quality System ........................................................................................................ 10
5 Conveyance System Analysis And Design ................................................................................ 10
6 Special Reports and Studies ...................................................................................................... 10
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7 Other Permits .............................................................................................................................. 11
8 Erosion and Sediment Control Analysis and Design ............................................................... 11
8.1 Erosion and Sediment Control .......................................................................................... 11
8.2 Stormwater Pollution Prevention and Spill Control ......................................................... 11
9 Bond Quantities, Facility Summaries, and Declaration of Covenant ..................................... 12
10 Operations and Maintenance Manual ...................................................................................... 12
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FIGURES (IN TEXT)
Figure 1 Site Location Map
Figure 2 Site Boundary Map
Figure 3 Site Characteristics Map
Figure 4 Soils Map
Figure 5 Downstream Analysis Map
APPENDICES
Appendix A TIR Worksheet
Appendix B Lake Study/No Net Loss Determination
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2025 Stormwater TIR – Hyatt Regency Lake Washington Page vi
ACRONYMS AND ABBREVIATIONS
BMP Best Management Practice
CAR Critical Area Report
CWA Clean Water Act
ESC Erosion and Sediment Control
NRCS Natural Resources Conservation Service
O&M Operations and Maintenance
PGIS Pollution-Generating Impervious Surface
PGPS Pollution-Generating Pervious Surface
RSWDM Renton Surface Water Design Manual
SFR Single-Family Residence
TIR Technical Information Report
USDA United States Department of Agriculture
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DISCLAIMER
This Hyatt Regency – Lake Washington Splices Stormwater Technical Information Report was
prepared by Pacific Stormwater Solutions, LLC. (Pacific Stormwater) for the pier repair project at
the Hyatt Regency in Renton, Washington. The material presented reflects Pacific Stormwater’s
professional opinion and judgement in accordance with the scope, schedule and other limitations
stated in this report and in the contract between Pacific Stormwater and the Client. The opinions
in this report are based on conditions and information existing at the time the document was
prepared and do not take into account any subsequent changes. In preparing this document,
Pacific Stormwater did not verify information supplied to it by others. Any use which a third party
makes of this document is the responsibility of said third party. Such a third party agrees that
Pacific Stormwater shall not be responsible for costs or damages of any kind, if any, suffered by it
or any other third party as a result of decisions made or actions taken based on this document.
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1 INTRODUCTION
Pacific Stormwater has prepared this Technical Information Report (TIR) in support of the Hyatt
Regency – Lake Washington Splices (Project) in accordance with the 2022 City of Renton Surface
Water Design Manual (RSWDM) and as required by the pre-application meeting (PRE 25-000168)
memorandum by the City of Renton. As stated in the memorandum project is required to comply
with special requirements #1: Area Specific Requirements, #2: Flood Hazard Delineation, #3:
Flood Protection Facilities, and #4: Source Control. This report contains all technical information
and analysis necessary for Targeted Drainage Review, Category #1. The TIR worksheet from
Reference 8-A of the RSWDM is included in Appendix A of this report.
1.1 PROJECT OVERVIEW
The proposed Project is located at 1053 Lake Washington Boulevard N in a mixed use zone in
Renton, King County, Washington (Figure 1). The Project area is primarily on King County parcel
number 00523059075, but also includes a small portion of the property to the northeast (parcel
number 0322059124). The Project area, which may encompass up to approximately 0.45 acres and
is shown on Figure 2, will be referred to as the Site.
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Figure 1. Site Location Map
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Figure 2. Site Boundary Map
The Site is currently developed with a 334,335 square-foot multi-story hotel building constructed
in 2017, paved parking and drive areas, landscaping, lakeside promenade, and in-water dock.
(Figure 2). The proposed project consists of repairing the existing pier by splicing 11 existing
piles and removing 8 derelict piles. No upland demolition, removal, excavation, staging, material
import, or construction is proposed. All work will be conducted from a barge stationed in Lake
Washington. A September 2025 Lake Study conducted by Northwest Environmental Consulting
(Appendix B) determined as long as Best Management Practices (BMPs) and conservation
measures are used, the proposed project will result in No Net Loss of ecological functions at the
Site. Site characteristics are shown below on Figure 3.
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Figure 3. Site Characteristics Map (with legend)
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According to the United States Department of Agriculture (USDA) Natural Resources
Conservation Service (NRCS) Soil Survey, soil at the Site is categorized as Urban Land (Figure 4).
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Figure 4. Soils Map (with legends)
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2 CONDITIONS AND REQUIREMENTS SUMMARY
Per the pre-application meeting with the City of Renton held on July 3, 2024, the proposed Project
requires a Simplified Drainage Review with Targeted Drainage Review Category #1. The Project
will include repairing 11 existing pier piles by splicing and removing eight derelict piles. Core
Requirements #1 through #8 and Special Requirements #1 through #4 are discussed in the
following sections, in accordance with the Targeted Drainage Review Category #1 requirements
presented in the RSWDM.
2.1 CORE REQUIREMENT #1 – DISCHARGE AT THE NATURAL LOCATION
The Site is developed with an existing stormwater catchment system that discharges to Lake
Washington and will not be altered during the proposed project. Any natural discharge locations
for the Site will not be altered during the proposed project.
2.2 CORE REQUIREMENT #2 – OFFSITE ANALYSIS
The proposed Project will not add new impervious or pervious surface or change the rate, volume,
or duration of stormwater discharge from the Site.
2.3 CORE REQUIREMENT #3 – FLOW CONTROL FACILITIES
The proposed Project will not add new impervious surface or pervious surface. Storm and surface
water runoff generated from the existing impervious surfaces at the Site will be mitigated by the
existing stormwater facilities installed at the Site.
2.4 CORE REQUIREMENT #4 – CONVEYANCE SYSTEM
No new pipe systems, culverts, ditches, or channels or be constructed during this Project. There
will be no alterations to the existing onsite conveyance systems.
2.5 CORE REQUIREMENT #5 – CONSTRUCTION STORMWATER POLLUTION PREVENTION
Erosion and sediment controls will be implemented for the proposed Project per the measures
detailed in Section 8.
2.6 CORE REQUIREMENT #6 – MAINTENANCE AND OPERATIONS
No new drainage facilities will be installed at the Site for the proposed Project.
2.7 CORE REQUIREMENT #7 – FINANCIAL GUARANTEES AND LIABILITY
No new drainage facilities will be installed at the Site for the proposed Project.
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2.8 CORE REQUIREMENT #8 – WATER QUALITY
This Project will not create new or replace any pollution generating impervious surface (PGIS) or
pollution generating pervious surface (PGPS).
2.9 SPECIAL REQUIREMENT #1 – OTHER ADOPTED AREA-SPECIFIC REQUIREMENTS
The Joint Aquatic Resources Permit Application (JARPA) has been completed for the proposed
project. A September 2025 Lake Study conducted by Northwest Environmental Consulting
(Appendix B). The report details the following conservation measures:
• The proposed project will not affect the lake bed. All pile stubbing will be completed to
the upper 3 feet of the piling.
• Short-term risks include the potential for petroleum spills that can occur with any
equipment operation. The chance of impact to the aquatic environment is reduced
because a crew trained in using spill containment measures will be on site and employ
these measures should a spill occur.
• The work will be completed during the prescribed in-water work window for this area of
Lake Washington (July 16 to December 31). Operating within this time frame helps
protect Chinook salmon, steelhead, bull trout and other salmonid fish species.
• Applicable BMPs will be used such as a floating boom around the in-water work area to
contain any floating debris that may escape during construction. The barge will have a
perimeter containment sock to absorb oil and grease that may wash from the barge
during construction.
• Hazardous material containment materials such as spill absorbent pads and trained
personnel will be required onsite during any phase of construction where machinery is in
operation near surface waters.
Additionally, the owner has opted to pay the required in-lieu fee to King County to complete the
mitigation requirements as required by the National Marine Fisheries Service using the King
County Restoration and Permitting (RAP) process. The City of Renton has not codified in lieu
mitigation as an option for the project.
Project activities will not affect shoreline functions.
2.10 SPECIAL REQUIREMENT #2 – FLOOD HAZARD AREA DELINEATION
The proposed Project area is not within any mapped FEMA 100-year floodplain. Constructing a
new or modifying any existing flood protection facility is not included in the proposed Project.
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2.11 SPECIAL REQUIREMENT #3 – FLOOD PROTECTION FACILITIES
The Project does not propose to construct a new or modify any existing flood protection facilities.
2.12 SPECIAL REQUIREMENT #4 – SOURCE CONTROLS
This Project does not require a commercial building or site development permit.
3 OFFSITE ANALYSIS
Stormwater runoff from the existing hotel development is discharged to Lake Washington from
three separate outfalls. One outfall (central) is only served by the central portion of the Site. The
southern outfall is served by the adjoining industrial Boeing facility, commercial office buildings,
electrical sub-station, and associated right-of-way infrastructure. The northern outfall is served by
the adjoining commercial office building property, two multi-family residential properties and
associated right-of-way infrastructure. Lake Washington is a Clean Water Act (CWA) Section
303(d)-listed impaired water body for many contaminants including bacteria, metals, PCBs, and
pesticides.
A Level 1 Downstream Analysis was not conducted as there will be no addition or alteration of
the existing flow pattern at the Site.
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4 FLOW CONTROL, LOW IMPACT DEVELOPMENT, AND WATER QUALITY FACILITY
ANALYSIS AND DESIGN
4.1 EXISTING SITE HYDROLOGY
The Site is approximately 90 percent hardscape with storm and surface water discharging directly
to Lake Washington. There are no wetlands and/or streams located on the Site or within the
project area.
4.2 DEVELOPED SITE HYDROLOGY
The Project proposes to splice 11 existing piles and remove eight derelict piles from the existing
dock located within Lake Washington. All work will be conducted from a barge stationed in the
lake. No upland construction, staging, demolition, excavation, or hauling is proposed. No new
impervious or pervious surfaces will be constructed.
4.3 PERFORMANCE STANDARDS
Flow control best management practices (BMPs) per RSWDM Core Requirement #9 are not
required for this Project. No new conveyance systems will be constructed and the flow serving
the existing conveyance system will not be altered.
4.4 FLOW CONTROL SYSTEM
No new conveyance systems will be constructed and the flow serving the existing conveyance
system will not be altered.
4.5 WATER QUALITY SYSTEM
No new conveyance systems will be constructed and the flow serving the existing conveyance
system will not be altered.
5 CONVEYANCE SYSTEM ANALYSIS AND DESIGN
No new conveyance systems will be constructed for this Project.
6 SPECIAL REPORTS AND STUDIES
A Lake Study/No Net Loss Determination was prepared by Northwest Environmental Consulting,
LLC in September of 2024 (Appendix B).
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7 OTHER PERMITS
The site owner and their representatives have completed the JARPA process and obtained all
other applicable permits and approvals for this Project.
8 EROSION AND SEDIMENT CONTROL ANALYSIS AND DESIGN
8.1 EROSION AND SEDIMENT CONTROL
The proposed Project will occur in-water of Lake Washington. All work will be conducted from a
barge stationed in the lake. No upland construction, staging, demolition, excavation, or hauling
is proposed. No new impervious or pervious surfaces will be constructed. The following erosion
and sediment control (ESC) procedures will be implemented for this Project:
• Debris Boom – Floating debris booms will be installed around the perimeter of the in-
water work area to prevent migration of any water-born debris produced during the
project.
• Silt Curtain – Silt curtains will be installed in tandem with debris booms to contain any
bottom sediment that may be disturbed during project activities.
8.2 STORMWATER POLLUTION PREVENTION AND SPILL CONTROL
The following stormwater pollution prevention and spill control procedures will be implemented
for this Project, in accordance with the King County Stormwater Pollution Prevention Manual and
Appendix D of the RSWDM:
• Material Delivery, Storage, and Containment (Section D.2.2.4) – Materials will be properly
stored and covered to prevent stormwater contamination and reduce exposure of
surfaces to precipitation. Any waste and pollutants generated or encountered onsite will
be handled and disposed of in a manner that does not cause contamination of
stormwater. Spill prevention and containment measures will be implemented for any
equipment used during the Project.
• Maintain Protective BMPs (Section D.2.2.10) – All BMPs used for the duration of the Project
will be maintained and repaired or replaced as needed to assure continued performance
and provide effective pollutant protection. Wattles shall remain or be repositioned until
root establishment has been achieved.
• Manage the Project (Section D.2.2.11) – The Project will be phased to the maximum
degree practicable to account for seasonal work limits. Routine inspections and
monitoring will be conducted.
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No chemicals, including agricultural chemicals, are anticipated to be used during the Project. No
cement, cement-related products, or other pH-modifying sources are anticipated to be used and
now saw-cutting will occur during the Project.
9 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT
Bond quantities, facility summaries, and/or a declaration of covenant are not required for this
project.
10 OPERATIONS AND MAINTENANCE MANUAL
The Site does not have any existing flow control or water quality facilities and no new facilities will
be constructed for this Project, therefore an operations and maintenance manual is not required.
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2025 Stormwater TIR – Hyatt Splice
APPENDICES
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2025 Stormwater TIR – Hyatt Splice
APPENDIX A – TIR WORKSHEET
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
CITY OF RENTON SURFACE WATER DESIGN MANUAL
2022 City of Renton Surface Water Design Manual 6/22/2022
8-A-1
REFERENCE 8-A
TECHNICAL INFORMATION REPORT (TIR)
WORKSHEET
Part 1 PROJECT OWNER AND
PROJECT ENGINEER
Part 2 PROJECT LOCATION AND
DESCRIPTION
Project Owner _____________________________
Phone ___________________________________
Address __________________________________
Project Engineer ___________________________
Company _________________________________
Phone ___________________________________
Project Name __________________________
CED Permit # ________________________
Location Township ________________
Range __________________
Section _________________
Site Address __________________________
Part 3 TYPE OF PERMIT APPLICATION Part 4 OTHER REVIEWS AND PERMITS
Land Use (e.g., Subdivision / Short Subd.)
Building (e.g., M/F / Commercial / SFR)
Grading
Right-of-Way Use
Other _______________________
DFW HPA
COE 404
DOE Dam Safety
FEMA Floodplain
COE Wetlands
Other ________
Shoreline
Management
Structural
Rockery/Vault/_____
ESA Section 7
Part 5 PLAN AND REPORT INFORMATION
Technical Information Report Site Improvement Plan (Engr. Plans)
Type of Drainage Review
check one):
Date (include revision
dates):
Date of Final:
Full
Targeted
Simplified
Large Project
Directed
Plan Type (check
one):
Date (include revision
dates):
Date of Final:
Full
Modified
Simplified
X
October 3, 2025
October 3, 2025
X
X
XX
Pier repairX
8
23
5
Renton, WA 98056
1053 Lake Washington Blvd N
Hyatt Regency Lake Washington Splices
206-900-8420
Pacific Stormwater Solutions
David Farr, P.E.
Renton, WA 98056
1053 Lake Washington Blvd N
425-207-2250
Hyatt Regency Lake Washington
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
6/22/2022 2022 City of Renton Surface Water Design Manual
8-A-2
Part 6 SWDM ADJUSTMENT APPROVALS
Type (circle one): Standard / Blanket
Description: (include conditions in TIR Section 2)
Approved Adjustment No. ______________________ Date of Approval: _______________________
Part 7 MONITORING REQUIREMENTS
Monitoring Required: Yes / No
Start Date: _______________________
Completion Date: _______________________
Describe: _________________________________
Re: SWDM Adjustment No. ________________
Part 8 SITE COMMUNITY AND DRAINAGE BASIN
Community Plan: ____________________________________________________________________
Special District Overlays: ______________________________________________________________
Drainage Basin: _____________________________________________________________________
Stormwater Requirements: _____________________________________________________________
Part 9 ONSITE AND ADJACENT SENSITIVE AREAS
River/Stream ________________________
Lake ______________________________
Wetlands ____________________________
Closed Depression ____________________
Floodplain ___________________________
Other _______________________________
Steep Slope __________________________
Erosion Hazard _______________________
Landslide Hazard ______________________
Coal Mine Hazard ______________________
Seismic Hazard _______________________
Habitat Protection ______________________
East Lake Washington - Renton
Lake Washington
X
X
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REFERENCE 8-A: TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
2022 City of Renton Surface Water Design Manual 6/22/2022
Ref 8-A-3
Part 10 SOILS
Soil Type Slopes Erosion Potential
High Groundwater Table (within 5 feet)
Other ________________________________
Sole Source Aquifer
Seeps/Springs
Additional Sheets Attached
Part 11 DRAINAGE DESIGN LIMITATIONS
REFERENCE
Core 2 – Offsite Analysis_________________
Sensitive/Critical Areas__________________
SEPA________________________________
LID Infeasibility________________________
Other________________________________
LIMITATION / SITE CONSTRAINT
Additional Sheets Attached
Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet
per Threshold Discharge Area)
Threshold Discharge Area:
name or description)
Core Requirements (all 9 apply):
Discharge at Natural Location Number of Natural Discharge Locations:
Offsite Analysis Level: 1 / 2 / 3 dated:__________________
Flow Control (include facility
summary sheet)
Standard: _______________________________
or Exemption Number: ____________
Conveyance System Spill containment located at: _____________________________
Erosion and Sediment Control /
Construction Stormwater Pollution
Prevention
CSWPP/CESCL/ESC Site Supervisor: _____________________
Contact Phone: _________________________
After Hours Phone: _________________________
Maintenance and Operation Responsibility (circle one): Private / Public
If Private, Maintenance Log Required: Yes / No
Financial Guarantees and Liability Provided: Yes / No
N/AN/AUrban Land
503-754-1128
503-754-1128
Kevin Cline
X
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REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
6/22/2022 2022 City of Renton Surface Water Design Manual
8-A-4
Part 12 TIR SUMMARY SHEET (provide one TIR Summary Sheet
per Threshold Discharge Area)
Water Quality (include facility
summary sheet)
Type (circle one): Basic / Sens. Lake / Enhanced Basic / Bog
or Exemption No. _______________________
On-site BMPs Describe:
Special Requirements (as applicable):
Area Specific Drainage
Requirements
Type: SDO / MDP / BP / Shared Fac. / None
Name: ________________________
Floodplain/Floodway Delineation Type (circle one): Major / Minor / Exemption / None
100-year Base Flood Elevation (or range): _______________
Datum:
Flood Protection Facilities Describe:
Source Control
commercial / industrial land use)
Describe land use:
Describe any structural controls:
Oil Control High-Use Site: Yes / No
Treatment BMP: _________________________________
Maintenance Agreement: Yes / No
with whom? _____________________________________
Other Drainage Structures
Describe:
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REFERENCE 8-A: TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
2022 City of Renton Surface Water Design Manual 6/22/2022
Ref 8-A-5
Part 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS
MINIMUM ESC REQUIREMENTS
DURING CONSTRUCTION
Clearing Limits
Cover Measures
Perimeter Protection
Traffic Area Stabilization
Sediment Retention
Surface Water Collection
Dewatering Control
Dust Control
Flow Control
Control Pollutants
Protect Existing and Proposed
BMPs/Facilities
Maintain Protective BMPs / Manage
Project
MINIMUM ESC REQUIREMENTS
AFTER CONSTRUCTION
Stabilize exposed surfaces
Remove and restore Temporary ESC Facilities
Clean and remove all silt and debris, ensure
operation of Permanent BMPs/Facilities, restore
operation of BMPs/Facilities as necessary
Flag limits of sensitive areas and open space
preservation areas
Other _______________________
Part 14 STORMWATER FACILITY DESCRIPTIONS (Note: Include Facility Summary and Sketch)
Flow Control Description Water Quality Description On-site BMPs Description
Detention
Infiltration
Regional
Facility
Shared
Facility
Other
Vegetated
Flowpath
Wetpool
Filtration
Oil Control
Spill Control
Other
Full Dispersion
Full Infiltration
Limited Infiltration
Rain Gardens
Bioretention
Permeable
Pavement
Basic Dispersion
Soil Amendment
Perforated Pipe
Connection
Other
X
X
X
X
X
X
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REFERENCE 8: PLAN REVIEW FORMS AND WORKSHEET
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
6/22/2022 2022 City of Renton Surface Water Design Manual
8-A-6
Part 15 EASEMENTS/TRACTS Part 16 STRUCTURAL ANALYSIS
Drainage Easement
Covenant
Native Growth Protection Covenant
Tract
Other ____________________________
Cast in Place Vault
Retaining Wall
Rockery > 4 High
Structural on Steep Slope
Other _______________________________
Part 17 SIGNATURE OF PROFESSIONAL ENGINEER
I, or a civil engineer under my supervision, have visited the site. Actual site conditions as observed were
incorporated into this worksheet and the attached Technical Information Report. To the best of my
knowledge the information provided here is accurate.
Signed/Date
2025.10.13
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
www.pacificsws.com
2025 Stormwater TIR – Hyatt Splice
APPENDIX B – LAKE STUDY/NO NET LOSS DETERMINATION
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Hyatt Regency at Southport
Lake Study/No Net Loss Determination
Prepared for
Hyatt Regency
1053 Lake Washington Boulevard NW
Renton, WA 98056
Prepared by
Northwest Environmental Consulting, LLC
3639 Palatine Avenue North
Seattle, WA 98103
206-234-2520
September 2025
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Hyatt Regency at Southport
Lake Study 1
Project Purpose
The project purpose is to repair 11 piles using bonnet splices at the hotel pier in Lake
Washington and remove an additional 8 derelict piles.
Location
The subject property is located at 1053 Lake Washington Boulevard NW (King County parcel
number 0523059076) in the City of Renton, Washington (Sheet 1). The parcel is on the
waterfront of Lake Washington.
Project Description
The proposed work is to repair 11 piles using bonnet splices, under a 2,167-square-foot pier
that serves the Hyatt Regency hotel. All work will be completed in water 10 to 15 feet deep and
occur in the upper 5 feet of the water column. Bonnet splicing requires removal of up to 3 feet
of the tops of piles. A steel section is added to the top of the pile by placing plates around the
top of the remaining pile and though bolting. A 6-inch epoxy coated steel pile section is then
bolted to the steel plates and fastened to the cap beam. 8 derelict piles will also be permanently
removed.
The pier provides moorage for hotel guests, and a place for guests to enjoy shoreline access
while staying at the hotel.
During construction, a floating boom will surround the work barge, pier, and work area.
Project drawings are included in Appendix A – Project Drawings.
Approach
Northwest Environmental Consulting LLC (NWEC) biologist Brad Thiele conducted a site visit in
August 2025 to evaluate conditions on site and adjacent to the site. NWEC also consulted the
following sources for information on potential critical fish and wildlife habitat along this shoreline:
• City of Renton COR Maps online database
(https://rp.rentonwa.gov/HTML5Public/Index.HTML?viewer=CORMaps)
• Washington State DNR Natural Heritage Features database
(https://www.dnr.wa.gov/publications/amp_nh_trs.pdf?znn6z)
• Washington Department of Fish and Wildlife (WDFW): Priority Habitats and Species
online database (http://apps.wdfw.wa.gov/phsontheweb/)
• WDFW SalmonScape online database of fish distribution and ESA listing units
(https://apps.wdfw.wa.gov/salmonscape/)
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Hyatt Regency at Southport
Lake Study 2
Site Description
The subject property is a shoreline tract in urban Renton, between the Boeing Renton Facility
and Gene Coulon Memorial Park. It has shoreline on its northern boundary with the hotel
landward, office buildings to the south, industrial buildings to the west, and condominiums to the
east.
The hotel property is fully built out, with a parking lot and adjacent buildings. The shoreline is
bulkheaded with concrete. Some mowed grass and ornamental shrubs exist on the hotel site.
The nearest shoreline vegetation is on Bird Island in Gene Coulon Memorial Park, east of the
site, and on the Boeing Facility shoreline west of the site.
The substrate of the lake is sand, gravel, and cobble. Euarasian milfoil (an invasive species)
was present at the time of the site visit. The Cedar River enters Lake Washington a half-mile
west of the hotel, along the western boundary of the Boeing facility.
Adjacent multi-family residential properties to the east and west have shared-use docks.
Lake and Stream Classifications
As a Shoreline of Statewide Significance (RMC 4-3-090B1) Lake Washington is defined as a
Shoreline of the State (RMC 4-11-190S). The Shoreline is designated as “Urban Center-2” (City
of Renton 2025) (Figure 1). No streams are present within 500 feet of the site.
Ordinary High Water Mark
The Ordinary High Water Mark (OHWM) for Lake Washington is the line of mean high water
(RMC 4-11-150 Definitions O). The Lake Washington water depth is controlled by the Army
Corps of Engineers at the Hiram M. Chittenden Locks and is at 21.8 feet above sea level (Corps
of Engineers Datum). The OHWM at the project site is shown in Appendix A – Project Drawings.
Vegetative Cover of the Site
There are no wetlands or floodplains mapped as occurring in the study area. There are no DNR
Natural Heritage Features listed in the study area (Figure 2). The site is maintained as a hotel
property with some street scaping. The site is generally paved and the water front is a paved
promenade.
Ecological Functions of Lake Washington at Site.
The site lacks native plantings that would provide habitat functions along the shoreline. There is
no plantable area along the shoreline. The nearest shoreline vegetation is on Bird Island at
Gene Coulon Memorial Park, and on the Boeing Facility’s shoreline to the west.
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Hyatt Regency at Southport
Lake Study 3
Species Use
Birds
Birds observed near the site include raptors, herons, eagles, waterfowl, and songbirds. Bald
eagles, protected by the Bald and Golden Eagles Protection Act and the Migratory Bird Treaty
Act, are protected as a “sensitive species” within the state of Washington (WAC 232-12-011).
Eagles were not observed in the area during the site study and no nest or adequate nesting
trees were visible along the shoreline. Bald eagles and other raptors are common on along the
shoreline of Lake Washington. Bird Island, less than a half mile to the east, supports many
native birds.
Mammals
No wild mammals were observed during the site visit, but Lake Washington is known to have
river otters, beavers, nutrias, and muskrats. Deer and coyotes are known to be present in the
vicinity; however, the hotel is in a highly urbanized area and presence of any mammals is
unlikely outside the park.
Fish
WDFW’s PHS mapping and SalmonScape mapping tools show the following salmonid species
using Lake Washington for migration and/or rearing: residential coastal cutthroat (Oncorhynchus
clarki), winter steelhead (O. mykiss), Dolly Varden/bull trout (Salvelinus malma), sockeye
salmon (O. nerka), fall Chinook (O. tshawytscha), coho salmon (O. kisutch), and kokanee (O.
nerka). The Salmonscape database maps the site as critical habitat to the Evolutionarily
Significant Unit (ESU) of Threatened Chinook and steelhead (Figure 3). Fall Chinook salmon
and winter steelhead are mapped as rearing in the first mile of the Cedar River, and spawning
upriver. Coho salmon are mapped as rearing in the first few hundred feet of the Cedar River,
and spawning upriver. Sockeye and kokanee are mapped as present in the first few miles of the
river, then spawning upriver. Bull trout are mapped as present in the river, and rearing in Lake
Washington.
The nearest salmon stream is the Cedar River, which enters the lake a half mile west of the
project area on the western edge of the Boeing facility. The project site is accessible to any fish
migrating or rearing in the lake, and Lake Washington is designated as critical habitat for
Endangered Fall Chinook salmon. A small stream enters the lake in Gene Coulon Memorial
Park. City mapping designates this as a Fish stream, but SalmonScape does not show
presence of salmonids.
There is wetland mapped west of the site, on the Boeing property shoreline (Figure 4).
Measures to Protect Trees and Vegetation
No trees will be disturbed during construction as all work will occur in-water and from the work
barge. No vegetation will be removed.
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Hyatt Regency at Southport
Lake Study 4
Project Impacts and Conservation Measures
Direct Impacts:
Sediments: Sediment disturbance will occur below the OHWM and along the shoreline of Lake
Washington. Additionally, the tug and barge propwash may disturb sediments temporarily when
making trips to/from the site. Juvenile salmonids could be temporarily displaced or stressed by
increased turbidity. Impacts to sediments should be minimal from pile work and the project
actions are not expected to exceed State Water Quality Standards.
Pile stub repairs are minimally invasive and do not require any disturbance of sediments. All
work is completed in the upper portion of the water column.
Lakebed: The proposed project will not affect the lake bed. All pile stubbing will be completed
to the upper 3 feet of the piling.
Noise: Construction equipment will create noise audible to neighbors and in-water. Noise
disturbance from the underwater chain saw will be short-term, and similar to that of vessel
motors. This noise will have negligible effects on fish and wildlife in the area. Work will be
completed during the in-water work window when juvenile fish are not expected to be present.
Potential spills: Short-term risks include the potential for petroleum spills that can occur with
any equipment operation. The chance of impact to the aquatic environment is reduced because
a crew trained in using spill containment measures will be on site and employ these measures
should a spill occur.
Indirect Impacts:
Recreational Boating: The project supports continued recreational boating, which has been
identified as a limiting factor for salmonid populations in Lake Washington. The pile repairs will
preserve existing moorage capacity in Lake Washington.
Other Conservation measures:
Work window: The work will be completed during the prescribed in-water work window for this
area of Lake Washington (July 16 to December 31). Operating within this time frame helps
protect Chinook salmon, steelhead, bull trout and other salmonid fish species.
Best Management Practices: Applicable BMPs will be used such as a floating boom around
the in-water work area to contain any floating debris that may escape during construction. The
barge will have a perimeter containment sock to absorb oil and grease that may wash from the
barge during construction.
Hazardous material containment materials such as spill absorbent pads and trained personnel
will be required onsite during any phase of construction where machinery is in operation near
surface waters.
Mitigation Strategy
Avoidance and Minimization
Impacts to Lake Washington cannot be avoided. The project has been designed to reduce
impacts by using BMPs to reduce potential impacts from construction. The repairs minimize
impacts by pile splicing, which does not require driving of new piles, and no new overwater
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Hyatt Regency at Southport
Lake Study 5
coverage is proposed. The maintenance repairs are the minimum necessary to complete the
work.
Mitigation Approach
The proposal will remove 8 derelict piles from the area. All wood piles under the pier are
untreated.
The owner has opted to pay the required in-lieu fee to King County to complete the mitigation
requirements as required by the National Marine Fisheries Service using the RAP process. The
City of Renton has not codified in lieu mitigation as an option for the project.
Shoreline Function and Values
Project activities will not affect shoreline functions. The proposal is for a maintenance of an
existing structure.
Conclusion
Juvenile Chinook salmon, and other salmonids, rear and migrate along the Lake Washington
shoreline.
There will be temporary impacts from noise and disturbed sediments during installation of the
pilings to construct the new docks.
The project will minimize construction effects on the environment by following the prescribed in
water work window and use applicable BMPs to prevent construction spills and debris from
escaping the area.
The long-term effects of the repair consist of removing 8 derelict untreated piles from the water
column.
This project has been designed to meet current residential dock standards and will use Best
Management Practices to reduce project impacts. The conservation measures are designed to
preserve ecological functions or prevent further degradation of habitat and will result in No Net
Loss of ecological functions at the site.
Document Preparers
Brad Thiele Biologist 31 years of experience NWEC
Kristin Noreen Permit Specialist 26 years of experience NWEC
The conclusions and findings in this report are based on field observations and measurements
and represent our best professional judgment and to some extent rely on other professional
service firms and available site information. Within the limitations of project scope, budget,
and seasonal variations, we believe the information provided herein is accurate and true to
the best of our knowledge. Northwest Environmental Consulting does not warrant any
assumptions or conclusions not expressly made in this report, or based on information or
analyses other than what is included herein.
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Hyatt Regency at Southport
Lake Study 6
REFERENCES
City of Renton. 2025. COR Maps. Accessed August 2025 at
https://maps.rentonwa.gov/Html5viewer/Index.html?viewer=CORMaps.
City of Renton Municipal Code (RMC). 2021. RMC Section 4-8-120. Code Publishing. Accessed
August 2025 at
https://www.codepublishing.com/WA/Renton/#!/Renton04/Renton0408/Renton0408120.
html
Washington Department of Fish and Wildlife (WDFW). 2025. Priority Habitats and Species.
Online database. Accessed August 2025 at http://apps.wdfw.wa.gov/phsontheweb/
WDFW. 2021. SalmonScape. Online database. Accessed August 2025 at
http://apps.wdfw.wa.gov/salmonscape/
Washington State Department of Natural Resources. 2025. Sections that Contain Natural
Heritage Features. Accessed August 2025 at
https://www.dnr.wa.gov/publications/amp_nh_trs.pdf?znn6z
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Appendix A:
Project Drawings
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Waterfront Construction Inc.
NWS-2025-437
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Waterfront Construction Inc.
NWS-2025-437
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Waterfront Construction Inc.
NWS-2025-437
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Waterfront Construction Inc.
NWS-2025-437
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Waterfront Construction Inc.
NWS-2025-437
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Waterfront Construction Inc.
NWS-2025-437
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Appendix B:
Figures
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Figure 1 City of Renton Critical Areas Map
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Figure 2 DNR Natural Heritage Map
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Figure 3 SalmonScape Map
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8/19/25, 5:05 PM PHS Report
about:blank 2/4Figure 4: PHS Map and Report p1
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PHS Species/Habitats Overview:
Occurence Name Federal Status State Status Sensitive Location
Freshwater Forested/Shrub
Wetland N/A N/A No
Freshwater Forested/Shrub Wetland
Priority Area Aquatic Habitat
Site Name N/A
Accuracy NA
Notes Wetland System: Freshwater Forested/Shrub Wetland - NWI Code:
PSS1/FO1Ch
Source Dataset NWIWetlands
Source Name Not Given
Source Entity US Fish and Wildlife Service
Federal Status N/A
State Status N/A
PHS Listing Status PHS Listed Occurrence
Sensitive N
SGCN N
Display Resolution AS MAPPED
ManagementRecommendations http://www.ecy.wa.gov/programs/sea/wetlands/bas/index.html
Geometry Type Polygons
DISCLAIMER. This report includes information that the Washington Department of Fish and Wildlife (WDFW) maintains in a central computer database. It is not an attempt to provide you
with an official agency response as to the impacts of your project on fish and wildlife. This information only documents the location of fish and wildlife resources to the best of our knowledge.
Report Date: 08/19/2025
PHS Species/Habitats Details:
8/19/25, 5:05 PM PHS Report
about:blank 3/4Figure 4: PHS Map and Report p2
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Appendix C:
Site Photographs
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Construction Stormwater Pollution Prevention
Plan (CSWPPP)
Hyatt Regency:
Lake Washington Pier Repair
Prepared for:
Hyatt Regency
1503 Lake Washington Blvd N
Renton, WA 98056
Permittee / Owner Developer Operator / Contractor
Scott Lane, Hyatt Regency N/A Waterfront Construction, Inc
Prepared by:
414 NE Ravenna Blvd. Ste A #1055
Seattle, Washington 98115
CSWPPP Preparation Date:
October 13, 2025
Project Construction Dates:
__________ - __________
ATTACHMENT E
RECEIVED
11/05/2025 jding
PLANNING DIVISION
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Construction Stormwater Pollution Prevention Plan October 13, 2025
Hyatt Regency, Renton, Washington Page ii
TABLE OF CONTENTS
Appendices .......................................................................................................................................... iv
Acronyms and Abbreviations ............................................................................................................... v
1 Introduction ................................................................................................................................... 1
2 Project Information ....................................................................................................................... 2
2.1 Facility Information............................................................................................................... 2
2.2 Existing Conditions .............................................................................................................. 2
2.3 Proposed Construction Activities ....................................................................................... 2
3 Construction Stormwater BMPs ................................................................................................... 3
3.1 Erosion and Sediment Control Measures .......................................................................... 3
3.1.1 Clearing Limits ................................................................................................................. 3
3.1.2 Cover Measures ............................................................................................................... 4
3.1.3 Perimeter Protection ........................................................................................................ 4
3.1.4 Traffic Area Stabilization .................................................................................................. 5
3.1.5 Sediment Retention ......................................................................................................... 5
3.1.6 Surface Water Collection................................................................................................. 6
3.1.7 Dewatering Control ......................................................................................................... 7
3.1.8 Dust Control ..................................................................................................................... 7
3.1.9 Flow Control ..................................................................................................................... 7
3.1.10 Protect Existing and Proposed Stormwater Facilities and Onsite BMPs ..................... 8
3.1.11 Maintain Protective BMPs ............................................................................................... 8
3.1.12 Manage the Project ......................................................................................................... 9
3.2 Stormwater Pollution Prevention and Spill Measures ..................................................... 10
4 Wet Season Requirements ......................................................................................................... 13
5 Critical Areas Restrictions ........................................................................................................... 13
6 Pollution Prevention Team ......................................................................................................... 14
7 Monitoring of Discharges ........................................................................................................... 14
8 Site Inspections ........................................................................................................................... 15
9 Recordkeeping ............................................................................................................................ 15
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10 Final Stabilization ................................................................................................................... 16
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APPENDICES
Appendix A – Site Maps
Appendix B – BMP Details
Appendix C – Correspondance
Appendix D – Alternative BMPs
Appendix E – Project Forms
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ACRONYMS AND ABBREVIATIONS
303(d) Section of the Clean Water Act pertaining to Impaired Waterbodies
BMP(s) Best Management Practice(s)
CESCL Certified Erosion and Sediment Control Lead
CSGP Construction Stormwater General Permit
CSWPP Construction Stormwater Pollution Prevention
CSWPPP Construction Stormwater Pollution Prevention Plan
Ecology Washington State Department of Ecology
EPA United States Environmental Protection Agency
ESC Erosion and Sediment Control
JARPA Joint Aquatic Resources Permit Application
NPDES National Pollutant Discharge Elimination System
NTU Nephelometric Turbidity Units
SWRO Southwest Regional Office of the Department of Ecology
PSW Pacific Stormwater
pH Power of Hydrogen
RSWDM Renton Surface Water Design Manual
SWMMWW Stormwater Management Manual for Western Washington
SWPPS Stormwater Pollution Prevention and Spill
TMDL Total Maximum Daily Load
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1 INTRODUCTION
This CSWPPP has prepared for the Hyatt Regency’s (Site) Lake Washington Pier Repair project
(Project) in Renton, Washington.
The purpose of this CSWPPP is to describe the proposed construction activities and all temporary
and permanent Erosion and Sediment Control (ESC) measures, Stormwater Pollution Prevention
and Spill (SWPPS) measures, inspection/monitoring activities, and recordkeeping that will be
implemented during the Project. The objectives of the CSWPPP are to:
1. Implement Best Management Practices (BMPs) to prevent erosion and sedimentation,
and to identify, reduce, eliminate, or prevent stormwater contamination and water
pollution from construction activity.
2. Prevent violations of surface water quality, ground water quality, or sediment
management standards.
3. During the construction phase, prevent adverse water quality impacts including impacts
on beneficial uses of the receiving waters by controlling peak flow rates and volumes of
stormwater runoff at the Site outfall and downstream of the outfall.
This CSWPPP was prepared based on the requirements set forth in the 2022 City of Renton
Surface Water Design Manual (RSWDM), the 2021 Construction Stormwater General Permit
(CSGP), and the 2024 Stormwater Management Manual for Western Washington (SWMMWW).
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2 PROJECT INFORMATION
2.1 FACILITY INFORMATION
Project/Site Name: Hyatt Regency
Street/Location: 1053 Lake Washington Blvd N
City: Renton
State: Washington
Zip Code: 98056
Receiving Waterbody: Lake Washington
2.2 EXISTING CONDITIONS
The Site consists of King County tax parcel number 0523059075 and encompasses approximately
5.49 acres, located in Renton, Washington. The Site is located on Southport on the south shore
of Lake Washington. It is bound to the north by Lake Washington, to the east by apartment
buildings, to the south by commercial buildings, and to the west by the Boeing Renton Factory.
Total acreage: 5.49
Disturbed acreage: 0.05 (2,200 square feet)
Existing structures: Hyatt Regency Hotel, floating pier
Landscape topography: Flat
Drainage patterns: Site drains to Lake Washington (northwest)
Existing vegetation: None, except for small landscaping areas
Critical areas (wetlands, streams,
erosion risk, steep slopes):
High seismic hazard area, shoreline (Lake Washington)
Known impairments for 303(d)
listed or Total Maximum Daily
Load (TMDL) for the receiving
water body:
Bacteria – fecal coliform
Known or suspected
contaminants associated with the
Site:
None
2.3 PROPOSED CONSTRUCTION ACTIVITIES
Description of Site development:
Maintenance and repair to a floating pier owned by Hyatt Regency on Lake Washington.
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Description of construction activities:
Removal of 8 derelict piles from the existing pier and conducting 11 pile splices. This work will be
done via a utility barge and crane offshore on Lake Washington. All construction equipment,
materials, and waste will be stored on the barge.
Description of Site drainage including flow from and onto adjacent properties:
The Site drains northwest to Lake Washington.
Description of final stabilization:
No clearing, grading, excavation, or other land disturbing activities are anticipated during this
Project. The existing float pier will be repaired in kind.
Proposed activities regarding contaminated soils or groundwater:
There are no known contaminated soils or groundwater in the Project area.
3 CONSTRUCTION STORMWATER BMPS
3.1 EROSION AND SEDIMENT CONTROL MEASURES
The following sections describe the ESC measures that are required to minimize erosion and
sediment transport off a construction site and protect areas of existing and proposed stormwater
facilities. BMP specifications provided in the SWMMWW or superseded by the RSWDM have
been included as Appendix B. Alternative BMPs are included in Appendix D as a quick reference
tool for the onsite inspector in the event that one or more BMPs listed below are deemed
ineffective or inappropriate during construction.
3.1.1 CLEARING LIMITS
Prior to any Site clearing or grading, those areas that are to remain undisturbed during project
construction shall be delineated. At a minimum, clearing limits shall be installed at the edges of
all critical area buffers and any other areas required to be left uncleared, areas around significant
trees identified to be retained, onsite BMP areas to be protected, and other areas identified to
be left undisturbed to protect sensitive features.
No clearing activities are anticipated to be conducted during this Project, however boundaries of
construction activities onshore will be marked with high visibility fence, as described below. There
are no areas of vegetation or native topsoil within the Project area.
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BMP Installation Schedule Inspection and Maintenance
SWMMWW C103: High
Visibility Fence
RSWDM D.2.1.1.1 Plastic or
Metal Fence
Installed prior to clearing
or grading activities.
Inspected at least weekly.
Maintenance performed if fence
is damaged or visibility is
reduced.
3.1.2 COVER MEASURES
Temporary and permanent cover measures shall be provided to protect all disturbed areas,
including the faces of cut and fill slopes. Temporary cover shall be installed if an area is to remain
unworked for more than seven days during the dry season or for more than two consecutive
working days during the wet season (Table 1). Any area to remain unworked for more than 30
days shall be seeded or sodded, unless the City of Renton (City) determines that winter weather
makes vegetation establishment infeasible. During the wet season, slopes and stockpiles at 3H:1V
or steeper and with more than ten feet of vertical relief shall be covered if they are to remain
unworked for more than 12 hours. Additionally, the material necessary to cover all disturbed areas
must be stockpiled onsite. The intent of these cover requirements is to have as much area as
possible covered during any period of precipitation.
Table 1 – Soil Exposure (West of the Cascade Mountains Crest)
Season Dates Number of Days Soil Can be Left Exposed
Dry Season May 1 – September 30 7 days
Wet Season October 1 – April 30 2 days
There will be no areas of exposed soil or disturbed land for this Project, however plastic sheeting
will be used to cover materials or areas that may impact stormwater, as described below.
BMP Installation Schedule Inspection and Maintenance
SWMMWW C123
and RSWDM
D.2.1.2.4: Plastic
Covering
Installed if materials/areas
will remain unworked for
more than two days (during
wet season).
Inspected at least weekly. Maintenance
performed if sheets are torn or if
plastic begins to deteriorate due to UV
radiation. When plastic is no longer
needed, it must be completely
removed.
3.1.3 PERIMETER PROTECTION
Perimeter protection to filter sediment from stormwater runoff shall be located downslope of all
disturbed areas and shall be installed prior to upslope grading. Perimeter protection includes the
use of vegetated strips as well as constructed measures such as silt fences, fiber rolls, sand/gravel
barriers, brush or rock filters, triangular silt dikes and other methods. During the wet season, 50
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linear feet of silt fence (and the necessary stakes) per acre of disturbed area must be stockpiled
onsite.
No clearing, grading, excavation, or other earth-moving activities are anticipated to be
conducted during this Project. The perimeter of the construction area that is onshore will be
marked with high visibility fence, as discussed above in Section 3.1.1. Additionally, a boom will
be used in the water to prevent materials from the pier from travelling outside the Project
boundaries and polluting the receiving water.
BMP Installation Schedule Inspection and Maintenance
N/A N/A N/A
3.1.4 TRAFFIC AREA STABILIZATION
Unsurfaced entrances, roads, and parking areas used by construction traffic shall be stabilized to
minimize erosion and tracking of sediment offsite. Stabilized construction entrances shall be
installed as the first step in clearing and grading. At the City’ s discretion, road and parking area
stabilization is not required during the dry season (unless dust is a concern) or if the Site is
underlain by coarse-grained soils. Roads and parking areas shall be stabilized immediately after
initial grading.
All construction work is anticipated to occur from an offshore barge on Lake Washington, where
all equipment will be stored. No construction equipment or vehicles will be driving in or out of
the work area. There will be no unsurfaced entrances, roads, or parking areas.
BMP Installation Schedule Inspection and Maintenance
N/A N/A N/A
3.1.5 SEDIMENT RETENTION
Surface water collected from disturbed areas of the Site shall be routed through a sediment pond
or trap prior to release from the Site, except for areas at the perimeter of the Site with drainage
areas small enough to be treated solely with perimeter protection (Section 3.1.3). If the soils and
topography are such that no offsite discharge of surface water is anticipated up to and including
the developed 2-year runoff event, sediment ponds and traps are not required. A 10-year peak
flow using the approved model with 15-minute time steps shall be used for sediment pond/trap
sizing if the project size, expected timing and duration of construction, or downstream conditions
warrant a higher level of protection. At the City’ s discretion, sites may be worked during the dry
season without sediment ponds and traps if there is some other form of protection of surface
waters. Protection of catch basins is required for inlets that are likely to be impacted by sediment
generated by the project and that do not drain to an onsite sediment pond or trap. Sediment
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retention facilities shall be installed prior to grading of any contributing area and shall be located
to avoid interference with the movement of juvenile salmonids attempting to enter off-channel
areas or drainages.
No clearing, grading, excavation, or other earth-moving activities are anticipated to be
conducted during this Project. For wood particles and other materials that may be generated
during work on the pier, a boom will be used in the water to prevent solids from travelling outside
the Project boundaries and polluting the receiving water. Inlet protection will be used for any
catch basins within the Project area. These methods are described below.
BMP Installation Schedule Inspection and Maintenance
SWMMWW C220: Inlet
Protection
RSWDM D.2.1.5.3:
Storm Drain Inlet
Protection
Installed as first step in
clearing, grading, or
other construction
activities.
Inspected at least weekly. Maintenance
performed when sediment in the inlet
protection has filled one third of the
storage capacity. If there is filter media,
it must be cleaned/replaced at least
monthly.
Floating Debris Boom
Curtain
Inspected at least weekly. Maintenance
performed according to vendor or
manufacturer specifications.
3.1.6 SURFACE WATER COLLECTION
All surface water from disturbed areas shall be intercepted, conveyed to a sediment pond or trap,
and discharged downslope of any disturbed areas, except for areas at the perimeter of the Site
with drainage areas small enough to be treated solely with perimeter protection (Section 3.1.3).
If the soils and topography are such that no offsite discharge of surface water is anticipated up to
and including the developed 2-year runoff event, surface water controls are not required. A 10-
year approved model 15-minute peak flow shall be used for sizing surface water controls if the
project size, expected timing and duration of construction, or downstream conditions warrant a
higher level of protection. At the City’ s discretion, sites may be worked during the dry season
without surface water controls if there is some other form of protection of surface waters.
Significant sources of upslope surface water that drain onto disturbed areas shall be intercepted
and conveyed to a stabilized discharge point downslope of the disturbed areas. Surface water
controls shall be installed concurrently with rough grading.
There will be no areas of exposed soil, disturbed land, or steep slopes for this Project that will
generate large amounts of stormwater runoff. BMPs for interception and collection of surface
water are not anticipated to be required.
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BMP Installation Schedule Inspection and Maintenance
N/A N/A N/A
3.1.7 DEWATERING CONTROL
Any runoff generated by dewatering shall be treated through construction of a sediment trap
when there is sufficient space or by releasing the water to a well vegetated, gently sloping area.
Discharge of sediment-laden water from dewatering activities to surface and storm waters is
prohibited. If dewatering occurs from areas where the water has contacted new concrete, such as
tanks, vaults, or foundations, the pH of the water must be monitored and neutralized prior to
discharge. Clean, non-turbid dewatering water can be discharged to surface waters provided the
flows are controlled so no erosion or flooding occurs. Clean water must not be routed through a
stormwater sediment pond. Highly turbid or contaminated dewatering water must be handled
separately from stormwater.
No dewatering activities are anticipated to occur during the Project.
BMP Installation Schedule Inspection and Maintenance
N/A N/A N/A
3.1.8 DUST CONTROL
Preventative measures to minimize the wind transport of soil shall be taken when a traffic hazard
may be created or when sediment transported by wind is likely to be deposited in water resources
or adjacent properties.
There will be no areas of exposed soil or disturbed land for this Project, however there may be
materials that have the potential to generate dust during construction activities. Dust control
measures will be utilized as needed during the Project, as described below.
BMP Installation Schedule Inspection and Maintenance
SWMMWW C140:
Dust Control
Installed when exposed soils or
other dust-generating areas are dry
to the point that wind transport is
possible.
Inspected at least weekly.
Maintenance performed as needed
by re-spraying or reapplying.
3.1.9 FLOW CONTROL
Surface water from disturbed areas must be routed through the Project’s onsite flow control
facility, or other provisions must be made to prevent increases in the existing Site conditions 2-
year and 10-year runoff peaks discharging from the Site during construction.
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There are no onsite flow control facilities for this Project.
BMP Installation Schedule Inspection and Maintenance
N/A N/A N/A
3.1.10 PROTECT EXISTING AND PROPOSED STORMWATER FACILITIES AND ONSITE BMPS
Protection measures shall be installed and maintained to prevent adverse impacts to existing and
proposed stormwater facilities and onsite BMPs for the Project. Adverse impacts may trigger a
requirement to restore or replace affected stormwater facilities and BMPs.
There are no existing stormwater facilities in the Project area that would be at risk of
sedimentation, compaction, or contamination.
BMP Installation Schedule Inspection and Maintenance
N/A N/A N/A
3.1.11 MAINTAIN PROTECTIVE BMPS
Protection measures shall be maintained to ensure continued performance of their intended
function, to prevent adverse impacts to existing or proposed stormwater facilities and onsite
BMPs, and protect other disturbed areas of the Project.
The following procedures should be followed to maintain BMPs during the Project:
• Maintain and repair all temporary and permanent erosion and sediment control BMPs as
needed to ensure continued performance of their intended function in accordance with
BMP specifications.
• Remove all temporary erosion and sediment control BMPs prior to final construction
approval, or within 30 days after achieving final Site stabilization or after the temporary
BMPs are no longer needed.
• Provide protection to all stormwater facilities and onsite BMPs installed for the permanent
control of stormwater from sediment and compaction.
• Remove or stabilize trapped sediment onsite. Permanently stabilize disturbed soil
resulting from removal of erosion and sediment control BMPs or vegetation.
Measures for maintaining onsite BMPs are described below.
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BMP Installation Schedule Inspection and Maintenance
SWMMWW C150:
Materials on Hand N/A All onsite BMPs are inspected at least
weekly. Maintenance on BMPs will be
performed as necessary to ensure
continued performance.
SWMMWW C160:
Certified Erosion and
Sediment Control Lead
N/A
For regular maintenance of BMPs and in emergency situations such as unexpected heavy rains,
having materials onsite reduces the time needed to implement BMPs when inspections indicate
that existing BMPs are not meeting the CSWPPP requirements. On hand materials listed in the
SWMMWW may include:
3.1.12 MANAGE THE PROJECT
Coordination and timing of Site development activities and timely inspection, maintenance, and
update of protective measures are necessary to effectively manage the Project and ensure the
success of protective ESC and SWPPS design and implementation. Projects shall assign a
qualified CSWPP Supervisor to be the primary contact for ESC and SWPPS issues and reporting,
coordination with subcontractors, and implementation of this CSWPPP.
The following procedures should be followed to manage the Project:
• Phase development projects to the maximum degree practicable and consider seasonal
work limits.
• Inspect, maintain, and repair all BMPs as needed to ensure continued performance of
their intended function. Conduct Site inspections and monitoring in accordance with the
CSGP and/or City requirements.
• Maintain, update, and implement the SWPPP in accordance with the CSGP and/or City
requirements.
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• Projects that disturb one or more acres must have Site inspections conducted by a
Certified Erosion and Sediment Control Lead (CESCL). Project sites less than one acre (not
part of a larger common plan of development or sale) may have a person without CESCL
certification conduct inspections. However, the inspector must have the skills to properly
assess Site impacts to stormwater quality and effectiveness of ESC measures. By the
initiation of construction, the SWPPP must identify the CESCL or inspector and they shall
be present onsite or on-call at all times.
• The CESCL or inspector must examine stormwater visually for the presence of suspended
sediment, turbidity, discoloration, and oil sheen. They must evaluate the effectiveness of
BMPs and determine if it is necessary to install, maintain, or repair BMPs to improve the
quality of stormwater discharges.
• Based on the results of the inspection, construction site operators must correct the
problems identified by:
o Reviewing the SWPPP for compliance with all construction SWPPP elements and
making appropriate revisions within 7 days of the inspection.
o Immediately beginning the process of fully implementing and maintaining
appropriate source control and/or treatment BMPs as soon as possible,
addressing the problems no later than within 10 days of the inspection. If
installation of necessary treatment BMPs is not feasible within 10 days, the
construction site operator may request an extension within the initial 10-day
response period.
o Documenting BMP implementation and maintenance in the Site logbook (applies
only to sites that have coverage under the CSGP).
o The CESCL or inspector must inspect all areas disturbed by construction activities,
all BMPs, and all stormwater discharge points at least once every calendar week
and within 24 hours of any discharge from the Site. (For purposes of this condition,
individual discharge events that last more than one day do not require daily
inspections. For example, if a stormwater pond discharges continuously over the
course of a week, only one inspection is required that week.) The CESCL or
inspector may reduce the inspection frequency for temporary stabilized, inactive
sites to once every calendar month.
3.2 STORMWATER POLLUTION PREVENTION AND SPILL MEASURES
This section details the stormwater pollution prevention and spill (SWPPS) measures that are
required to prevent, reduce, or eliminate the discharge of pollutants to onsite or adjacent
stormwater systems or watercourses from construction activities. BMP specifications provided in
the SWMMWW or superseded by the RSWDM have been included as Appendix B. Alternative
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BMPs are included in Appendix D as a quick reference tool for the onsite inspector in the event
that one or more BMPs listed below are deemed ineffective or inappropriate during construction.
All pollutants, including waste materials and demolition debris, that occur onsite shall be handled
and disposed of in a manner that does not cause contamination of stormwater. Good
housekeeping and preventative measures will be taken to ensure that the Site will be kept clean,
well-organized, and free of debris. BMPs to be implemented to control specific sources of
pollutants are listed and further discussed below.
BMP Installation Schedule Inspection and Maintenance
SWMMWW C153 and RSWDM
D.2.2.4: Material Delivery,
Storage, and Containment
Installed before start of
construction activities.
All onsite BMPs are
inspected at least weekly.
Maintenance on BMPs will
be performed as necessary
to ensure continued
performance.
SWMMWW C140: Dust Control
Measures
Installed when dust
generating activities
occur.
SWMMWW C220: Inlet
Protection
RSWDM D.2.1.5.3: Storm Drain
Inlet Protection
Installed before start of
clearing, grading, or other
construction activities.
SWMMWW C152 and RSWDM
D.2.2.3: Sawcutting and Surfacing
Pollution Prevention
Installed when sawcutting
or surfacing activities
occur.
SWMMWW C162: Scheduling N/A
1) Vehicles, Construction Equipment, and/or Petroleum Product Storage/Dispensing:
i) All vehicles and equipment will be inspected regularly to detect any leaks or spills, and
to identify maintenance needs to prevent leaks or spills.
ii) Contaminated surfaces shall be cleaned immediately following any discharge or spill
incident.
iii) Maintenance and repair of heavy equipment and vehicles involving oil changes,
hydraulic system drain down, solvent and de-greasing cleaning operations, fuel tank
drain down and removal, and other activities which may result in discharge or spillage
of pollutants to the ground or into stormwater runoff must be conducted using spill
prevention measures.
iv) A wheel wash is not expected to be necessary for this Project due the presence of a
stabilized, paved access road. If a wheel wash is used, all wash water will be disposed
of offsite by an approved waste disposal vendor.
2) Chemical Storage:
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i) Storage of hazardous materials onsite shall be minimized. All chemicals stored in the
construction area will conform to the appropriate source control BMPs listed in
Volume IV of the SWMMWW. In Western Washington, all chemicals shall have cover,
containment, and protection provided onsite. Safety Data Sheets (SDS) shall be made
available for all materials stored onsite.
ii) Application of agricultural chemicals, including fertilizers and pesticides, shall be
conducted in a manner and at application rates that will not result in loss of chemical
to stormwater runoff. Manufacturers’ recommendations for application procedures
and rates shall be followed.
3) Demolition:
i) In the event dust is released from construction activities, it will be controlled using
appropriate dust control measures.
ii) Storm drain inlets vulnerable to stormwater discharge carrying dust, soil, or debris will
be protected.
iii) Any process water and slurry resulting from saw cutting and surfacing operations will
be prevented from entering the waters of the State.
4) Concrete Work and Grouting:
i) Process water and slurry resulting from concrete work will be prevented from entering
the waters of the State.
ii) No concrete work is anticipated for this Project.
5) pH Modifying Wastewater:
i) Concrete truck washout results in a slurry waste byproduct. pH modifying wastewater
will be prevented from entering the waters of the State. All wastewater will be
disposed offsite or treated.
Table 2 – pH Modifying Sources
X None
Bulk cement
Cement kiln dust
Fly ash
Other cementitious materials
New concrete washing or curing waters
Waste streams generated from concrete grinding and
sawing
Exposed aggregate processes
Dewatering concrete vaults
Concrete pumping and mixer washout waters
Recycled concrete
Other (i.e. calcium lignosulfate) [please describe]
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6) Sanitary Wastewater:
i) Wastewater from sanitary facilities onsite will be properly disposed of at an offsite
location or treatment facility.
7) Solid Waste:
i) Solid waste will be stored in secure, clearly marked containers. Containers are to
remain closed when not in use. If no cover is available, plastic sheeting or similar will
be used to eliminate stormwater run-on. A Waste Handling Plan will be prepared for
solid waste storage and handling during this Project.
8) Water Line Flushing:
i) Potable water, including water from water line flushing shall be dechlorinated to a
concentration of 0.1 mg/L (ppm) or less shall be pH adjusted (if necessary) and be
discharged in volumes and velocities controlled to prevent suspension of sediment in
the stormwater system.
ii) No water line flushing is anticipated for this Project.
9) Chemical Treatment:
i) In the event that chemical treatment is required, written approval from Ecology shall
be obtained before using chemicals to treat Site stormwater.
ii) No chemical treatment of stormwater is anticipated for this Project.
Other BMPs, such as spill kits, will be administered as necessary to address any additional
pollutant sources onsite.
4 WET SEASON REQUIREMENTS
There will be no exposed soils during this Project, therefore a Wet Season ESC Plan has not been
prepared for this work. Measures will be taken to cover construction materials, reduce stormwater
runoff, and prevent stormwater pollution during rain events.
5 CRITICAL AREAS RESTRICTIONS
Construction activities for this Project will occur on Lake Washington, and therefore a Joint
Aquatic Resources Permit Application (JARPA) was submitted to the U.S. Army Corps of
Engineers, Seattle District. This Project was authorized by the Army Corps of Engineers on August
20, 2025. The authorization letter is included in Appendix C. Additionally, this Project qualifies for
a Shoreline Substantial Development Permit Exemption for normal maintenance or repair of
existing structures or developments.
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6 POLLUTION PREVENTION TEAM
The pollution prevention team consists of personnel responsible for the implementation of the
CSWPPP, including a designated CSWPP Supervisor as required by the RSWDM.
Names and contact information for those identified as members of the pollution prevention team
are provided in Table 3 below.
Table 3 – Pollution Prevention Team
Title Name Responsibilities Phone Number
CSWPP Supervisor Overseeing CSWPPP
implementation
Project Manager Scott Lane (Hyatt
Regency) Overseeing Project 425-207-2207
CESCL or Inspector
Inspecting Site conditions,
BMPs, and stormwater
quality
General Contractor
Mark Kushino
(Waterfront
Construction, Inc.)
Overseeing construction
activities 206-407-5859
7 MONITORING OF DISCHARGES
The CSWPP Supervisor shall have a turbidity meter onsite and shall use it to monitor surface and
storm water discharges from the Project Site and into onsite wetlands, streams, or lakes whenever
runoff occurs from onsite activities and during storm events. The CSWPP Supervisor shall keep a
log of all turbidity measurements taken onsite and make it available to the City upon request. The
CSWPP Supervisor shall also use the specific SWPPS BMP procedures for monitoring surface and
stormwater discharge for pollutants and acceptable discharge levels. The CSWPP Supervisor shall
keep logs as required by the procedures of all measurements taken onsite and make them
available to the City on request.
If a turbidity test of surface and storm water discharges leaving the Project Site is greater than the
benchmark value of 25 nephelometric turbidity units (NTU) set by Ecology, but less than 250 NTU,
the CSWPP Supervisor shall do all of the following:
• Review the ESC plan for compliance and make appropriate revisions within 7 days of the
discharge that exceeded the benchmark of 25 NTU, AND
• Fully implement and maintain appropriate ESC measures as soon as possible but no later
than 10 days after the discharge that exceeded the benchmark, AND
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• Document ESC implementation and maintenance in the Site logbook
If a turbidity test of surface or storm water entering onsite wetlands, streams, or lakes indicates a
turbidity level greater than 5 NTU above background when the background turbidity is 50 NTU
or less, or 10% above background when the background turbidity is greater than 50 NTU, then
corrective actions and/or additional measures beyond those specified in SWDM Section 1.2.5.1
shall be implemented as deemed necessary by the CED inspector or onsite CSWPP supervisor.
IF discharge turbidity is 250 NTU or greater, the CSWPP Supervisor shall do all of the following:
• Notify the City by telephone, AND
• Review the ESC plan for compliance and make appropriate revisions within 7 days of the
discharge that exceeded the benchmark of 25 NTU, AND
• Fully implement and maintain appropriate ESC measures as soon as possible but no later
than 10 days after the discharge that exceeded the benchmark, AND
• Document ESC implementation and maintenance in the Site logbook. AND
• Continue to sample discharges until turbidity is 25 NTU or lower, or the turbidity is no
more than 10% over background turbidity.
Stormwater monitoring will be performed during “regular business hours”. Regular business
hours for the purpose of sample collection are defined as first shift, Monday through Friday.
8 SITE INSPECTIONS
Site inspections will be conducted per Section 3.1.12 at least once every calendar week and
within 24 hours following any discharge from the Site by personnel knowledgeable in erosion and
sediment control. The name and contact information for the CESCL or inspector is provided in
Section 6 of this CSWPPP. The Site inspector will record each Site inspection on the form
provided in Appendix E.
9 RECORDKEEPING
This CSWPPP will be maintained onsite at all times or the duration of the Project. A copy of this
CSWPPP has been submitted to the City as part of the Drainage Review for this Project. If required
by the City, maintenance on BMPs will be documented on the maintenance report forms provided
in Appendix C. If monitoring for turbidity or pH is required, a logbook must also be maintained
onsite to document sampling results.
This CSWPPP will be modified within 7 days of the following:
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• Any part of the plan is ineffective in eliminating or significantly minimizing pollutants in
stormwater discharges from the Site.
• There has been a change in design, construction, operation, or maintenance at the Site
that has a significant effect on the discharge, or potential for discharge, of pollutants to
the waters of the State.
• Determination based on inspection(s) that additional or modified BMPs are necessary to
correct problems identified.
10 FINAL STABILIZATION
Prior to obtaining final construction approval, the Site shall be stabilized, the structural ESC and
SWPPS measures removed, and drainage facilities cleaned. The removal of ESC and SWPPS
measures is not required for those projects, such as plats, that will be followed by additional
construction under a different permit. In these circumstances, the need for removing or retaining
the measures must be evaluated on a site-specific basis.
To obtain final construction approval, the following conditions must be met:
• All disturbed areas of the Site shall be vegetated or otherwise permanently stabilized.
• Structural measures such as, but not limited to, silt fences, pipe slope drains, construction
entrances, storm drain inlet protection, sediment traps and ponds, concrete washout and
collection pits, and pollutant storage shall be removed from the Site. Measures that will
quickly decompose, such as brush barriers and organic mulches, may be left in place. The
City must approve an applicant’s proposal to remove fencing prior to the establishment
of vegetation.
• All permanent surface water facilities, including catch basins, manholes, pipes, ditches,
channels, flow control facilities, and water quality facilities, shall be cleaned. Existing and
newly constructed BMPs or facilities shall be cleaned and/or mitigated as necessary to
restore functionality. Any offsite catch basin that required protection during construction
shall also be cleaned.
• If only the infrastructure of the Site has been developed, with building construction to
occur under a different permit, then the critical area buffers or setbacks shall be clearly
marked to alert future buyers and builders.
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APPENDIX A – SITE MAPS
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Waterfront Construction Inc.
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Waterfront Construction Inc.
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Waterfront Construction Inc.
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Waterfront Construction Inc.
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Waterfront Construction Inc.
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Waterfront Construction Inc.
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APPENDIX B – BMP DETAILS
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3/6/24, 12:07 PM BMP C103: High-Visibility Fence
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> BMP C103: High-Visibility Fence
BMP C103: High-Visibility Fence
Purpose
High-visibility fencing is intended to:
Restrict clearing to approved limits.
Prevent disturbance of sensitive areas, their buffers, and other areas required to be left undisturbed.
Limit construction traffic to designated construction entrances, exits, or internal roads.
Protect areas where marking with survey tape may not provide adequate protection.
Conditions of Use
To establish clearing limits plastic, fabric, or metal fence may be used:
At the boundary of sensitive areas, their buffers, and other areas required to be left uncleared.
As necessary to control vehicle access to and on the site.
Design and Installation Specifications
High-visibility plastic fence shall be composed of a high-density polyethylene material and shall be at least four
feet in height. Posts for the fencing shall be steel or wood and placed every 6 feet on center (maximum) or as
needed to ensure rigidity. The fencing shall be fastened to the post every six inches with a polyethylene tie. On
long continuous lengths of fencing, a tension wire or rope shall be used as a top stringer to prevent sagging
between posts. The fence color shall be high-visibility orange. The fence tensile strength shall be 360 lbs/ft using
the ASTM D4595 testing method.
If appropriate install fabric silt fence in accordance with BMP C233: Silt Fence to act as high-visibility fence. Silt
fence shall be at least 3 feet high and must be highly visible to meet the requirements of this BMP.
Metal fences shall be designed and installed according to the manufacturer's specifications.
Metal fences shall be at least 3 feet high and must be highly visible.
Fences shall not be wired or stapled to trees.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
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Maintenance Standards
If the fence has been damaged or visibility reduced, it shall be repaired or replaced immediately and visibility
restored.
Washington State Department of Ecology
2019 Stormwater Management Manual for Western Washington (2019 SWMMWW)
Publication No.19-10-021
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
3/6/24, 12:08 PM BMP C123: Plastic Covering
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> BMP C123: Plastic Covering
BMP C123: Plastic Covering
Purpose
Plastic covering provides immediate, short-term erosion protection to slopes and disturbed areas.
Conditions of Use
Plastic covering may be used on disturbed areas that require cover measures for less than 30 days, except as
stated below.
Plastic is particularly useful for protecting cut and fill slopes and stockpiles. However, the relatively rapid
breakdown of most polyethylene sheeting makes it unsuitable for applications greater than six months.
Due to rapid runoff caused by plastic covering, do not use this method upslope of areas that might be
adversely impacted by concentrated runoff. Such areas include steep and/or unstable slopes.
Plastic sheeting may result in increased runoff volumes and velocities, requiring additional on-site measures
to counteract the increases. Creating a trough with wattles or other material can convey clean water away
from these areas.
To prevent undercutting, trench and backfill rolled plastic covering products.
Although the plastic material is inexpensive to purchase, the cost of installation, maintenance, removal, and
disposal add to the total costs of this BMP.
Whenever plastic is used to protect slopes, install water collection measures at the base of the slope. These
measures include plastic-covered berms, channels, and pipes used to convey clean rainwater away from
bare soil and disturbed areas. Do not mix clean runoff from a plastic covered slope with dirty runoff from a
project.
Other uses for plastic include:
Temporary ditch liner.
Pond liner in temporary sediment pond.
Liner for bermed temporary fuel storage area if plastic is not reactive to the type of fuel being stored.
Emergency slope protection during heavy rains.
Temporary drainpipe (“elephant trunk”) used to direct water.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
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Design and Installation Specifications
Plastic slope cover must be installed as follows:
1. Run plastic up and down the slope, not across the slope.
2. Plastic may be installed perpendicular to a slope if the slope length is less than 10 feet.
3. Provide a minimum of 8-inch overlap at the seams.
4. On long or wide slopes, or slopes subject to wind, tape all seams.
5. Place plastic into a small (12-inch wide by 6-inch deep) slot trench at the top of the slope and
backfill with soil to keep water from flowing underneath.
6. Place sand filled burlap or geotextile bags every 3 to 6 feet along seams and tie them together
with twine to hold them in place.
7. Inspect plastic for rips, tears, and open seams regularly and repair immediately. This prevents
high velocity runoff from contacting bare soil, which causes extreme erosion.
8. Sandbags may be lowered into place tied to ropes. However, all sandbags must be staked in
place.
Plastic sheeting shall have a minimum thickness of 6 mil.
If erosion at the toe of a slope is likely, a gravel berm, riprap, or other suitable protection shall be installed at
the toe of the slope in order to reduce the velocity of runoff.
Maintenance Standards
Torn sheets must be replaced and open seams repaired.
Completely remove and replace the plastic if it begins to deteriorate due to ultraviolet radiation.
Completely remove plastic when no longer needed.
Dispose of old tires used to weight down plastic sheeting appropriately.
Approved as Functionally Equivalent
Ecology has approved products as able to meet the requirements of this BMP. The products did not pass through
the Technology Assessment Protocol – Ecology (TAPE) process. Local jurisdictions may choose not to accept
these products, or may require additional testing prior to consideration for local use. Products that Ecology has
approved as functionally equivalent are available for review on Ecology’s website at:
https://ecology.wa.gov/Regulations-Permits/Guidance-technical-assistance/Stormwater-permittee-guidance-
resources/Emerging-stormwater-treatment-technologies
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
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Washington State Department of Ecology
2019 Stormwater Management Manual for Western Washington (2019 SWMMWW)
Publication No.19-10-021
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
3/6/24, 12:08 PM BMP C140: Dust Control
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> BMP C140: Dust Control
BMP C140: Dust Control
Purpose
Dust control prevents wind transport of dust from disturbed soil surfaces onto roadways, drainage ways, and
surface waters.
Conditions of Use
Use dust control in areas (including roadways) subject to surface and air movement of dust where on-site or off-
site impacts to roadways, drainage ways, or surface waters are likely.
Design and Installation Specifications
Vegetate or mulch areas that will not receive vehicle traffic. In areas where planting, mulching, or paving is
impractical, apply gravel or landscaping rock.
Limit dust generation by clearing only those areas where immediate activity will take place, leaving the
remaining area(s) in the original condition. Maintain the original ground cover as long as practical.
Construct natural or artificial windbreaks or windscreens. These may be designed as enclosures for small
dust sources.
Sprinkle the site with water until the surface is wet. Repeat as needed. To prevent carryout of mud onto the
street, refer to BMP C105: Stabilized Construction Access and BMP C106: Wheel Wash.
Irrigation water can be used for dust control. Irrigation systems should be installed as a first step on sites
where dust control is a concern.
Spray exposed soil areas with a dust palliative, following the manufacturer’s instructions and cautions
regarding handling and application. Used oil is prohibited from use as a dust suppressant. Local
governments may approve other dust palliatives such as calcium chloride or PAM.
PAM (BMP C126: Polyacrylamide (PAM) for Soil Erosion Protection) added to water at a rate of 0.5 pounds
per 1,000 gallons of water per acre and applied from a water truck is more effective than water alone. This
is due to increased infiltration of water into the soil and reduced evaporation. In addition, small soil particles
are bonded together and are not as easily transported by wind. Adding PAM may reduce the quantity of
water needed for dust control. Note that the application rate specified here applies to this BMP, and is not
the same application rate that is specified in BMP C126: Polyacrylamide (PAM) for Soil Erosion Protection,
but the downstream protections still apply.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
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Refer to BMP C126: Polyacrylamide (PAM) for Soil Erosion Protection for conditions of use. PAM shall not
be directly applied to water or allowed to enter a water body.
Contact your local Air Pollution Control Authority for guidance and training on other dust control measures.
Compliance with the local Air Pollution Control Authority constitutes compliance with this BMP.
Use vacuum street sweepers.
Remove mud and other dirt promptly so it does not dry and then turn into dust.
Techniques that can be used for unpaved roads and lots include:
Lower speed limits. High vehicle speed increases the amount of dust stirred up from unpaved roads
and lots.
Upgrade the road surface strength by improving particle size, shape, and mineral types that make up
the surface and base materials.
Add surface gravel to reduce the source of dust emission. Limit the amount of fine particles (those
smaller than .075 mm) to 10 to 20 percent.
Use geotextile fabrics to increase the strength of new roads or roads undergoing reconstruction.
Encourage the use of alternate, paved routes, if available.
Apply chemical dust suppressants using the admix method, blending the product with the top few
inches of surface material. Suppressants may also be applied as surface treatments.
Limit dust-causing work on windy days.
Pave unpaved permanent roads and other trafficked areas.
Maintenance Standards
Respray area as necessary to keep dust to a minimum.
Washington State Department of Ecology
2019 Stormwater Management Manual for Western Washington (2019 SWMMWW)
Publication No.19-10-021
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3/6/24, 12:08 PM BMP C150: Materials on Hand
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> BMP C150: Materials on Hand
BMP C150: Materials on Hand
Purpose
Keep quantities of erosion prevention and sediment control materials on the project site at all times to be used for
regular maintenance and emergency situations such as unexpected heavy rains. Having these materials on-site
reduces the time needed to replace existing or implement new BMPs when inspections indicate that existing
BMPs are not meeting the Construction SWPPP requirements. In addition, contractors can save money by buying
some materials in bulk and storing them at their office or yard.
Conditions of Use
Construction projects of any size or type can benefit from having materials on hand. A small commercial
development project could have a roll of plastic and some gravel available for immediate protection of bare
soil and temporary berm construction. A large earthwork project, such as highway construction, might have
several tons of straw, several rolls of plastic, flexible pipe, sandbags, geotextile fabric and steel “T” posts.
Materials should be stockpiled and readily available before any site clearing, grubbing, or earthwork begins.
A large contractor or project proponent could keep a stockpile of materials that are available for use on
several projects.
If storage space at the project site is at a premium, the contractor could maintain the materials at their office
or yard. The office or yard must be less than an hour from the project site.
Design and Installation Specifications
Depending on project type, size, complexity, and length, materials and quantities will vary. A good minimum list of
items that will cover numerous situations includes:
Clear Plastic, 6 mil
Drainpipe, 6 or 8 inch diameter
Sandbags, filled
Straw Bales for mulching
Quarry Spalls
Washed Gravel
Geotextile Fabric
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
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Catch Basin Inserts
Steel "T" Posts
Silt fence material
Straw Wattles
Maintenance Standards
All materials with the exception of the quarry spalls, steel “T” posts, and gravel should be kept covered and
out of both sun and rain.
Re-stock materials as needed.
Washington State Department of Ecology
2019 Stormwater Management Manual for Western Washington (2019 SWMMWW)
Publication No.19-10-021
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3/6/24, 12:09 PM BMP C151: Concrete Handling
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> BMP C151: Concrete Handling
BMP C151: Concrete Handling
Purpose
Concrete work can generate process water and slurry that contain fine particles and high pH, both of which can
violate water quality standards in the receiving water. Concrete spillage or concrete discharge to waters of the
State is prohibited. Use this BMP to minimize and eliminate concrete, concrete process water, and concrete slurry
from entering waters of the State.
Conditions of Use
Any time concrete is used, utilize these management practices. Concrete construction project components
include, but are not limited to:
Curbs
Sidewalks
Roads
Bridges
Foundations
Floors
Runways
Disposal options for concrete, in order of preference are:
1. Off-site disposal
2. Concrete wash-out areas (see BMP C154: Concrete Washout Area)
3. De minimus washout to formed areas awaiting concrete
Design and Installation Specifications
Wash concrete truck drums at an approved off-site location or in designated concrete washout areas only.
Do not wash out concrete trucks onto the ground (including formed areas awaiting concrete), or into storm
drains, open ditches, streets, or streams. Refer to BMP C154: Concrete Washout Area for information on
concrete washout areas.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
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Return unused concrete remaining in the truck and pump to the originating batch plant for recycling.
Do not dump excess concrete on site, except in designated concrete washout areas as allowed in
BMP C154: Concrete Washout Area.
Wash small concrete handling equipment (e.g. hand tools, screeds, shovels, rakes, floats, trowels, and
wheelbarrows) into designated concrete washout areas or into formed areas awaiting concrete pour.
At no time shall concrete be washed off into the footprint of an area where an infiltration feature will be
installed.
Wash equipment difficult to move, such as concrete paving machines, in areas that do not directly drain to
natural or constructed stormwater conveyance or potential infiltration areas.
Do not allow washwater from areas, such as concrete aggregate driveways, to drain directly (without
detention or treatment) to natural or constructed stormwater conveyances.
Contain washwater and leftover product in a lined container when no designated concrete washout areas
(or formed areas, allowed as described above) are available. Dispose of contained concrete and concrete
washwater (process water) properly.
Always use forms or solid barriers for concrete pours, such as pilings, within 15-feet of surface waters.
Refer to BMP C252: Treating and Disposing of High pH Water for pH adjustment requirements.
Refer to the Construction Stormwater General Permit (CSWGP) for pH monitoring requirements if the
project involves one of the following activities:
Significant concrete work (as defined in the CSWGP).
The use of soils amended with (but not limited to) Portland cement-treated base, cement kiln dust or
fly ash.
Discharging stormwater to segments of water bodies on the 303(d) list (Category 5) for high pH.
Maintenance Standards
Check containers for holes in the liner daily during concrete pours and repair the same day.
Washington State Department of Ecology
2019 Stormwater Management Manual for Western Washington (2019 SWMMWW)
Publication No.19-10-021
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
3/6/24, 12:09 PM BMP C152: Sawcutting and Surfacing Pollution Prevention
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> BMP C152: Sawcutting and Surfacing Pollution Prevention
BMP C152: Sawcutting and Surfacing Pollution Prevention
Purpose
Sawcutting and surfacing operations generate slurry and process water that contains fine particles and high pH
(concrete cutting), both of which can violate the water quality standards in the receiving water. Concrete spillage
or concrete discharge to waters of the State is prohibited. Use this BMP to minimize and eliminate process water
and slurry created through sawcutting or surfacing from entering waters of the State.
Conditions of Use
Utilize these management practices anytime sawcutting or surfacing operations take place. Sawcutting and
surfacing operations include, but are not limited to:
Sawing
Coring
Grinding
Roughening
Hydro-demolition
Bridge and road surfacing
Design and Installation Specifications
Vacuum slurry and cuttings during cutting and surfacing operations.
Slurry and cuttings shall not remain on permanent concrete or asphalt pavement overnight.
Slurry and cuttings shall not drain to any natural or constructed drainage conveyance including stormwater
systems. This may require temporarily blocking catch basins.
Dispose of collected slurry and cuttings in a manner that does not violate ground water or surface water
quality standards.
Do not allow process water generated during hydro-demolition, surface roughening or similar operations to
drain to any natural or constructed drainage conveyance including stormwater systems. Dispose of process
water in a manner that does not violate ground water or surface water quality standards.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
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Handle and dispose of cleaning waste material and demolition debris in a manner that does not cause
contamination of water. Dispose of sweeping material from a pick-up sweeper at an appropriate disposal
site.
Maintenance Standards
Continually monitor operations to determine whether slurry, cuttings, or process water could enter waters of the
state. If inspections show that a violation of water quality standards could occur, stop operations and immediately
implement preventive measures such as berms, barriers, secondary containment, and/or vacuum trucks.
Washington State Department of Ecology
2019 Stormwater Management Manual for Western Washington (2019 SWMMWW)
Publication No.19-10-021
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3/6/24, 12:09 PM BMP C153: Material Delivery, Storage, and Containment
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> BMP C153: Material Delivery, Storage, and Containment
BMP C153: Material Delivery, Storage, and Containment
Purpose
Prevent, reduce, or eliminate the discharge of pollutants to the stormwater system or watercourses from material
delivery and storage. Minimize the storage of hazardous materials on-site, store materials in a designated area,
and install secondary containment.
Conditions of Use
Use at construction sites with delivery and storage of the following materials:
Petroleum products such as fuel, oil and grease
Soil stabilizers and binders (e.g., Polyacrylamide)
Fertilizers, pesticides and herbicides
Detergents
Asphalt and concrete compounds
Hazardous chemicals such as acids, lime, adhesives, paints, solvents, and curing compounds
Any other material that may be detrimental if released to the environment
Design and Installation Specifications
The temporary storage area should be located away from vehicular traffic, near the construction
entrance(s), and away from waterways or storm drains.
Safety Data Sheets (SDS) should be supplied for all materials stored. Chemicals should be kept in their
original labeled containers.
Hazardous material storage on-site should be minimized.
Hazardous materials should be handled as infrequently as possible.
During the wet weather season (Oct 1 – April 30), consider storing materials in a covered area.
Materials should be stored in secondary containments, such as an earthen dike, horse trough, or even a
children’s wading pool for non-reactive materials such as detergents, oil, grease, and paints. Small amounts
of material may be secondarily contained in “bus boy” trays or concrete mixing trays.
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
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Do not store chemicals, drums, or bagged materials directly on the ground. Place these items on a pallet
and, when possible, within secondary containment.
If drums must be kept uncovered, store them at a slight angle to reduce ponding of rainwater on the lids to
reduce corrosion. Domed plastic covers are inexpensive and snap to the top of drums, preventing water
from collecting.
Liquids, petroleum products, and substances listed in 40 CFR Parts 110, 117, or 302 shall be stored in
approved containers and drums and shall not be overfilled. Containers and drums shall be stored in
temporary secondary containment facilities.
Temporary secondary containment facilities shall provide for a spill containment volume able to contain 10%
of the total enclosed container volume of all containers, or 110% of the capacity of the largest container
within its boundary, whichever is greater.
Secondary containment facilities shall be impervious to the materials stored therein for a minimum contact
time of 72 hours.
Sufficient separation should be provided between stored containers to allow for spill cleanup and
emergency response access.
During the wet weather season (Oct 1 – April 30), each secondary containment facility shall be covered
during non-working days, prior to and during rain events.
Keep material storage areas clean, organized and equipped with an ample supply of appropriate spill clean-
up material (spill kit).
The spill kit should include, at a minimum:
1-Water Resistant Nylon Bag
3-Oil Absorbent Socks 3”x 4’
2-Oil Absorbent Socks 3”x 10’
12-Oil Absorbent Pads 17”x19”
1-Pair Splash Resistant Goggles
3-Pair Nitrile Gloves
10-Disposable Bags with Ties
Instructions
Maintenance Standards
Secondary containment facilities shall be maintained free of accumulated rainwater and spills. In the event
of spills or leaks, accumulated rainwater and spills shall be collected and placed into drums. These liquids
shall be handled as hazardous waste unless testing determines them to be non-hazardous.
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Re-stock spill kit materials as needed.
Washington State Department of Ecology
2019 Stormwater Management Manual for Western Washington (2019 SWMMWW)
Publication No.19-10-021
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
3/6/24, 12:09 PM BMP C160: Certified Erosion and Sediment Control Lead
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> BMP C160: Certified Erosion and Sediment Control Lead
BMP C160: Certified Erosion and Sediment Control Lead
Purpose
The project proponent designates at least one person as the responsible representative in charge of erosion and
sediment control (ESC), and water quality protection. The designated person shall be responsible for ensuring
compliance with all local, state, and federal erosion and sediment control and water quality requirements.
Construction sites one acre or larger that discharge to waters of the State must designate a Certified Erosion and
Sediment Control Lead (CESCL) as the responsible representative.
Conditions of Use
A CESCL shall be made available on projects one acre or larger that discharge stormwater to surface waters of
the state. Sites less than one acre may have a person without CESCL certification conduct inspections.
The CESCL shall:
Have a current certificate proving attendance in an erosion and sediment control training course that meets
the minimum ESC training and certification requirements established by Ecology.
Ecology has provided the minimum requirements for CESCL course training, as well as a list of ESC training
and certification providers at:
https://ecology.wa.gov/Regulations-Permits/Permits-certifications/Certified-erosion-sediment-control
OR
Be a Certified Professional in Erosion and Sediment Control (CPESC). For additional information go to:
http://www.envirocertintl.org/cpesc/
Specifications
CESCL certification shall remain valid for three years.
The CESCL shall have authority to act on behalf of the contractor or project proponent and shall be
available, or on-call, 24 hours per day throughout the period of construction.
The Construction SWPPP shall include the name, telephone number, fax number, and address of the
designated CESCL. See II-2 Construction Stormwater Pollution Prevention Plans (Construction SWPPPs).
A CESCL may provide inspection and compliance services for multiple construction projects in the same
geographic region, but must be on site whenever earthwork activities are occurring that could generate
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release of turbid water.
Duties and responsibilities of the CESCL shall include, but are not limited to the following:
Maintaining a permit file on site at all times which includes the Construction SWPPP and any
associated permits and plans.
Directing BMP installation, inspection, maintenance, modification, and removal.
Updating all project drawings and the Construction SWPPP with changes made.
Completing any sampling requirements including reporting results using electronic Discharge
Monitoring Reports (WebDMR).
Facilitate, participate in, and take corrective actions resulting from inspections performed by outside
agencies or the owner.
Keeping daily logs, and inspection reports. Inspection reports should include:
Inspection date/time.
Weather information; general conditions during inspection and approximate amount of
precipitation since the last inspection.
Visual monitoring results, including a description of discharged stormwater. The presence of
suspended sediment, turbid water, discoloration, and oil sheen shall be noted, as applicable.
Any water quality monitoring performed during inspection.
General comments and notes, including a brief description of any BMP repairs, maintenance or
installations made as a result of the inspection.
A summary or list of all BMPs implemented, including observations of all erosion/sediment
control structures or practices. The following shall be noted:
1. Locations of BMPs inspected.
2. Locations of BMPs that need maintenance.
3. Locations of BMPs that failed to operate as designed or intended.
4. Locations of where additional or different BMPs are required.
Washington State Department of Ecology
2019 Stormwater Management Manual for Western Washington (2019 SWMMWW)
Publication No.19-10-021
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3/6/24, 12:09 PM BMP C162: Scheduling
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> BMP C162: Scheduling
BMP C162: Scheduling
Purpose
Sequencing a construction project reduces the amount and duration of soil exposed to erosion by wind, rain,
runoff, and vehicle tracking.
Conditions of Use
The construction sequence schedule is an orderly listing of all major land-disturbing activities together with the
necessary erosion and sedimentation control measures planned for the project. This type of schedule guides the
contractor on work to be done before other work is started so that serious erosion and sedimentation problems
can be avoided.
Following a specified work schedule that coordinates the timing of land-disturbing activities and the installation of
control measures is perhaps the most cost-effective way of controlling erosion during construction. The removal of
ground cover leaves a site vulnerable to erosion. Construction sequencing that limits land clearing, provides timely
installation of erosion and sedimentation controls, and restores protective cover quickly can significantly reduce
the erosion potential of a site.
Design Considerations
Minimize construction during rainy periods.
Schedule projects to disturb only small portions of the site at any one time. Complete grading as soon as
possible. Immediately stabilize the disturbed portion before grading the next portion. Practice staged
seeding in order to revegetate cut and fill slopes as the work progresses.
Washington State Department of Ecology
2019 Stormwater Management Manual for Western Washington (2019 SWMMWW)
Publication No.19-10-021
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You are here: 2019 SWMMWW > Volume II - Construction Stormwater Pollution Prevention > II-3 Construction Stormwater BMPs
> BMP C220: Inlet Protection
BMP C220: Inlet Protection
Purpose
Inlet protection prevents coarse sediment from entering drainage systems prior to permanent stabilization of the
disturbed area.
Conditions of Use
Use inlet protection at inlets that are operational before permanent stabilization of the disturbed areas that
contribute runoff to the inlet. Provide protection for all storm drain inlets downslope and within 500 feet of a
disturbed or construction area, unless those inlets are preceded by a sediment trapping BMP.
Also consider inlet protection for lawn and yard drains on new home construction. These small and numerous
drains coupled with lack of gutters can add significant amounts of sediment into the roof drain system. If possible,
delay installing lawn and yard drains until just before landscaping, or cap these drains to prevent sediment from
entering the system until completion of landscaping. Provide 18-inches of sod around each finished lawn and yard
drain.
Table II-3.10: Storm Drain Inlet Protection lists several options for inlet protection. All of the methods for inlet
protection tend to plug and require a high frequency of maintenance. Limit contributing drainage areas for an
individual inlet to one acre or less. If possible, provide emergency overflows with additional end-of-pipe treatment
where stormwater ponding would cause a hazard.
Table II-3.10: Storm Drain Inlet Protection
Type of Inlet
Protection
Emergency
Overflow
Applicable for Paved/
Earthen Surfaces Conditions of Use
Drop Inlet Protection
Excavated drop inlet
protection
Yes, temporary
flooding may occur Earthen
Applicable for heavy flows. Easy
to maintain. Large area requirement:
30'x30'/acre
Block and gravel drop
inlet protection Yes Paved or Earthen Applicable for heavy concentrated flows.
Will not pond.
Gravel and wire drop
inlet protection No Paved or Earthen Applicable for heavy concentrated flows.
Will pond. Can withstand traffic.
Catch basin filters Yes Paved or Earthen Frequent maintenance required.
Curb Inlet Protection
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Type of Inlet
Protection
Emergency
Overflow
Applicable for Paved/
Earthen Surfaces Conditions of Use
Curb inlet protection
with wooden weir
Small capacity
overflow Paved Used for sturdy, more compact installation.
Block and gravel curb
inlet protection Yes Paved Sturdy, but limited filtration.
Culvert Inlet Protection
Culvert inlet sediment
trap N/A N/A 18 month expected life.
Design and Installation Specifications
Excavated Drop Inlet Protection
Excavated drop inlet protection consists of an excavated impoundment around the storm drain inlet. Sediment
settles out of the stormwater prior to entering the storm drain. Design and installation specifications for excavated
drop inlet protection include:
Provide a depth of 1-2 ft as measured from the crest of the inlet structure.
Slope sides of excavation should be no steeper than 2H:1V.
Minimum volume of excavation is 35 cubic yards.
Shape the excavation to fit the site, with the longest dimension oriented toward the longest inflow area.
Install provisions for draining to prevent standing water.
Clear the area of all debris.
Grade the approach to the inlet uniformly.
Drill weep holes into the side of the inlet.
Protect weep holes with screen wire and washed aggregate.
Seal weep holes when removing structure and stabilizing area.
Build a temporary dike, if necessary, to the down slope side of the structure to prevent bypass flow.
Block and Gravel Filter
A block and gravel filter is a barrier formed around the inlet with standard concrete blocks and gravel. See Figure
II-3.17: Block and Gravel Filter. Design and installation specifications for block gravel filters include:
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Provide a height of 1 to 2 feet above the inlet.
Recess the first row of blocks 2-inches into the ground for stability.
Support subsequent courses by placing a pressure treated wood 2x4 through the block opening.
Do not use mortar.
Lay some blocks in the bottom row on their side to allow for dewatering the pool.
Place hardware cloth or comparable wire mesh with ½-inch openings over all block openings.
Place gravel to just below the top of blocks on slopes of 2H:1V or flatter.
An alternative design is a gravel berm surrounding the inlet, as follows:
Provide a slope of 3H:1V on the upstream side of the berm.
Provide a slope of 2H:1V on the downstream side of the berm.
Provide a 1-foot wide level stone area between the gravel berm and the inlet.
Use stones 3 inches in diameter or larger on the upstream slope of the berm.
Use gravel ½- to ¾-inch at a minimum thickness of 1-foot on the downstream slope of the berm.
Figure II-3.17: Block and Gravel Filter
pdf download
Gravel and Wire Mesh Filter
Gravel and wire mesh filters are gravel barriers placed over the top of the inlet. This method does not provide an
overflow. Design and installation specifications for gravel and wire mesh filters include:
Use a hardware cloth or comparable wire mesh with ½-inch openings.
Place wire mesh over the drop inlet so that the wire extends a minimum of 1-foot beyond each side of
the inlet structure.
Overlap the strips if more than one strip of mesh is necessary.
Place coarse aggregate over the wire mesh.
Provide at least a 12-inch depth of aggregate over the entire inlet opening and extend at least 18-
inches on all sides.
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Catch Basin Filters
Catch basin filters are designed by manufacturers for construction sites. The limited sediment storage capacity
increases the amount of inspection and maintenance required, which may be daily for heavy sediment loads. To
reduce maintenance requirements, combine a catch basin filter with another type of inlet protection. This type of
inlet protection provides flow bypass without overflow and therefore may be a better method for inlets located
along active rights-of-way. Design and installation specifications for catch basin filters include:
Provides 5 cubic feet of storage.
Requires dewatering provisions.
Provides a high-flow bypass that will not clog under normal use at a construction site.
Insert the catch basin filter in the catch basin just below the grating.
Curb Inlet Protection with Wooden Weir
Curb inlet protection with wooden weir is an option that consists of a barrier formed around a curb inlet with a
wooden frame and gravel. Design and installation specifications for curb inlet protection with wooden weirs
include:
Use wire mesh with ½-inch openings.
Use extra strength filter cloth.
Construct a frame.
Attach the wire and filter fabric to the frame.
Pile coarse washed aggregate against the wire and fabric.
Place weight on the frame anchors.
Block and Gravel Curb Inlet Protection
Block and gravel curb inlet protection is a barrier formed around a curb inlet with concrete blocks and gravel. See
Figure II-3.18: Block and Gravel Curb Inlet Protection. Design and installation specifications for block and gravel
curb inlet protection include:
Use wire mesh with ½-inch openings.
Place two concrete blocks on their sides abutting the curb at either side of the inlet opening. These are
spacer blocks.
Place a 2x4 stud through the outer holes of each spacer block to align the front blocks.
Place blocks on their sides across the front of the inlet and abutting the spacer blocks.
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Place wire mesh over the outside vertical face.
Pile coarse aggregate against the wire to the top of the barrier.
Figure II-3.18: Block and Gravel Curb Inlet Protection
pdf download
Curb and Gutter Sediment Barrier
Curb and gutter sediment barrier is a sandbag or rock berm (riprap and aggregate) 3 feet high and 3 feet wide in a
horseshoe shape. See Figure II-3.19: Curb and Gutter Barrier. Design and installation specifications for curb and
gutter sediment barrier include:
Construct a horseshoe shaped berm, faced with coarse aggregate if using riprap, 3 feet high and 3 feet
wide, at least 2 feet from the inlet.
Construct a horseshoe shaped sedimentation trap on the upstream side of the berm. Size the trap to
sediment trap standards for protecting a culvert inlet.
Figure II-3.19: Curb and Gutter Barrier
pdf download
Maintenance Standards
Inspect all forms of inlet protection frequently, especially after storm events. Clean and replace clogged
catch basin filters. For rock and gravel filters, pull away the rocks from the inlet and clean or replace. An
alternative approach would be to use the clogged rock as fill and put fresh rock around the inlet.
Do not wash sediment into storm drains while cleaning. Spread all excavated material evenly over the
surrounding land area or stockpile and stabilize as appropriate.
Approved as Functionally Equivalent
Ecology has approved products as able to meet the requirements of this BMP. The products did not pass through
the Technology Assessment Protocol – Ecology (TAPE) process. Local jurisdictions may choose not to accept
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these products, or may require additional testing prior to consideration for local use. Products that Ecology has
approved as functionally equivalent are available for review on Ecology’s website at:
https://ecology.wa.gov/Regulations-Permits/Guidance-technical-assistance/Stormwater-permittee-guidance-
resources/Emerging-stormwater-treatment-technologies
Washington State Department of Ecology
2019 Stormwater Management Manual for Western Washington (2019 SWMMWW)
Publication No.19-10-021
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
www.pacificsws.com
Construction Stormwater Pollution Prevention Plan October 13, 2025
Hyatt Regency, Renton, Washington Page 19
APPENDIX C – CORRESPONDANCE
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DEPARTMENT OF THE ARMY U.S. ARMY CORPS OF ENGINEERS, SEATTLE DISTRICT 4735 EAST MARGINAL WAY SOUTH, BLDG 1202 SEATTLE, WA 98134-2388
Regulatory Branch August 20, 2025
Mr. Scott Lane
Hyatt Regency 1053 Lake Washington Boulevard North Renton, Washington 98056
Reference: NWS-2025-437 Hyatt Regency (Lake Washington
Splices)
Dear Mr. Lane:
We have reviewed your application to perform maintenance on an existing 2,167-square-foot commercial, recreational pier by repairing eleven 11.5-14-inch wood piles by cutting 3-feet below the waterline and splicing with 6-inch diameter steel pipes, waterward of the OHWM, in Lake Washington at Renton, King County, Washington.
Based on the information you provided to us, Nationwide Permit (NWP) 3, Maintenance (Federal Register December 27, 2021, Vol. 86, No. 245), authorizes your proposal as depicted on the enclosed drawings dated May 12, 2025.
In order for this authorization to be valid, you must ensure the work is performed in
accordance with the enclosed NWP 3, Terms and Conditions and the following special conditions:
a. In order to meet the requirements of the Endangered Species Act (ESA) and Magnuson-Stevens Fishery Conservation and Management Act (MSA) Restoration and Permitting (RAP) programmatic consultation (National Marine Fisheries Service (NMFS) Reference Number WCRO-2016-00008), you must implement and abide by the ESA
requirements and/or agreements set forth in the Biological Opinion (BO) dated February 17, 2017, the NMFS’ RAP Implementation Guide dated April 21, 2025 and
the RAP form for your individual project (NMFS Reference Number WCRO 2016-00008-9450. The BO is available on the U.S. Army Corps of Engineers (Corps) website
(Permit Guidebook, Endangered Species, Programmatic Consultations, Activities on Lakes Washington and Sammamish). Upon completion of the permitted work, you must submit an As-Built Report (see RAP Implementation Guide, Appendix E) to the Corps and the NMFS (rap-reports.wcr@noaa.gov). You must visually monitor the work area
during construction when the substrate is disturbed and ensure that observable turbidity
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increases do not extend beyond a 150-foot radius around the work area. If turbidity
increases occur beyond this area, you must include it in your As-Built Report. All
reports must prominently display the reference number NWS-2025-437. Failure to
comply with these requirements constitutes non-compliance with the ESA and your Corps permit. The NMFS is the appropriate authority to determine compliance with the terms and conditions of its BO and with the ESA. If you cannot comply with the terms
and conditions of this programmatic consultation, you must, prior to commencing construction, contact the Corps, Seattle District, Regulatory Branch for an individual consultation in accordance with the requirements of the ESA and/or the MSA.
b. To be in compliance with Special Condition "a", you must request an invoice from the King County Mitigation Reserves Program (ATTN: Ms. Megan Webb,
megan.webb@kingcounty.gov; In-lieu Fee Mitigation and Transfer of Development Rights, King County Water and Land Resources Division, Department of Natural
Resources and Parks, 201 South Jackson Street, Room 600, Seattle, Washington, 98104-3855) and provide the U.S. Army Corps of Engineers a receipt that you have paid the required conservation fees of $600.00 within 60 days from the date of permit authorization. This information must prominently display the reference number
NWS-2025- 437. c. In order to meet the requirements of the Endangered Species Act (ESA)
programmatic letter of concurrence for selected activities in the Lake Washington/
Lake Sammamish Basins (U.S. Fish and Wildlife Service (USFWS) Reference Number
13410-2009-I-0386-R001) you must comply with the relevant conservation measures in the document titled, Conservation Measures for Activities Covered under the Lake Washington Programmatic Consultation Letter of Concurrence available on the
U.S. Army Corps of Engineers (Corps) website (Permit Guidebook, Endangered Species, Programmatic Consultations, Activities on Lakes Washington and Sammamish). If you cannot comply with these conservation measures, you must, prior to commencing construction, contact the Corps, Seattle District, Regulatory Branch for
an individual consultation in accordance with the requirements of the ESA. The USFWS is the appropriate authority to determine compliance with the ESA.
d. In order to meet the requirements of the Endangered Species Act you may
conduct the authorized activities from July 16 through July 31 and November 16 through December 31 in any year this permit is valid. You shall not conduct work authorized by this permit from August 1 through November 15 and January 1 through July 15 in any year this permit is valid.
We have reviewed your project pursuant to the requirements of the Endangered Species Act, the Magnuson-Stevens Fishery Conservation and Management Act and
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the National Historic Preservation Act. We have determined this project complies with
the requirements of these laws provided you comply with all of the permit general and
special conditions.
Please be reminded that Special Condition “a” of your permit requires that you implement and abide by the Endangered Species Act (ESA) requirements set forth in
the programmatic Biological Opinion (BO) for this project. In particular, within 60 days you must provide an As-Built Report and a receipt for the conservation fees, as described in the BO.
The authorized work complies with the Washington State Department of Ecology’s (Ecology) Water Quality Certification (WQC) requirements and Coastal Zone
Management (CZM) consistency determination decision for this NWP. No further coordination with Ecology for WQC and CZM is required.
Lake Washington is a water of the U.S. The Section 10 jurisdictional boundaries are shown on the enclosed permit drawings. If you believe these boundaries are inaccurate, you may request a preliminary or approved jurisdictional determination (JD).
If one is requested, please be aware that we may require the submittal of additional information to complete the JD and work authorized in this letter may not occur until the JD has been completed.
We have reviewed your project pursuant to the requirements of Section 14 of the
Rivers and Harbors Act of 1899 as codified at 33 U.S.C.408 (Section 408). It has been determined that the activities authorized do not impair the usefulness of the U.S. Army Corps of Engineers Navigation project and is not injurious to the public interest.
Our verification of this NWP authorization is valid until March 14, 2026, unless the NWP is modified, reissued, or revoked prior to that date. If the authorized work for the NWP authorization has not been completed by that date and you have commenced or
are under contract to commence this activity before March 14, 2026, you will have until March 14, 2027, to complete the activity under the enclosed terms and conditions of this
NWP. Failure to comply with all terms and conditions of this NWP verification invalidates this authorization and could result in a violation of Section 404 of the Clean
Water Act and/or Section 10 of the Rivers and Harbors Act. You must also obtain all local, State, and other Federal permits that apply to this project. Upon completing the authorized work, you must fill out and return the enclosed
Certificate of Compliance with Department of the Army Permit. All compliance reports should be submitted to the U.S. Army Corps of Engineers, Seattle District, Regulatory Branch electronically at nws.compliance@usace.army.mil.
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Thank you for your cooperation during the permitting process. We are interested in
your experience with our Regulatory Program and encourage you to complete a
customer service survey. Referenced documents and information about our program
are available on our website at www.nws.usace.army.mil, select “Regulatory Permit Information”. A copy of this letter with enclosures will be furnished to Mr. Mark Kushino of Waterfront Construction at mark@waterfrontconstruction.com. If you have any
questions, please contact me at ana.c.reyes@usace.army.mil. Sincerely,
Ana Reyes, Project Manager
Regulatory Branch Enclosures
cc: Ecology (ecyrefedpermits@ecy.wa.gov) KCMRP (megan.webb@kingcounty.gov)
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WASHINGTON STATE
Joint Aquatic Resources Permit
Application (JARPA) Form1,2 [help]
USE BLACK OR BLUE INK TO ENTER ANSWERS IN THE WHITE SPACES BELOW.
Part 1–Project Identification
1. Project Name (A name for your project that you create. Examples: Smith’s Dock or Seabrook Lane Development) [help]
Hyatt Regency - Lake Washington Splices
Part 2–Applicant
The person and/or organization responsible for the project. [help]
2a. Name (Last, First, Middle)
Lane, Scott
2b. Organization (If applicable)
Hyatt Regency
2c. Mailing Address (Street or PO Box)
1053 Lake Washington Blvd N
2d. City, State, Zip
Renton, WA 98056
2e. Phone (1) 2f. Phone (2) 2g. Fax 2h. E-mail
425/207-2207 scott.lane@hyatt.com
1Additional forms may be required for the following permits:
• If your project may qualify for Department of the Army authorization through a Regional General Permit (RGP), contact the U.S. Army Corps of Engineers for application information (206) 764-3495. • Not all cities and counties accept the JARPA for their local Shoreline permits. If you need a Shoreline permit, contact the appropriate city or county government to make sure they accept the JARPA. 2To access an online JARPA form with [help] screens, go to http://www.epermitting.wa.gov/site/alias__resourcecenter/jarpa_jarpa_form/9984/jarpa_form.aspx.
For other help, contact the Governor’s Office for Regulatory Innovation and Assistance at (800) 917-0043 or help@oria.wa.gov.
AGENCY USE ONLY Date received:
Agency reference #:
Tax Parcel #(s):
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Part 3–Authorized Agent or Contact
Person authorized to represent the applicant about the project. (Note: Authorized agent(s) must sign 11b of this application.) [help]
3a. Name (Last, First, Middle)
Kushino, Mark
3b. Organization (If applicable)
Waterfront Construction, Inc
3c. Mailing Address (Street or PO Box)
205 NE Northlake Way, Ste 230
3d. City, State, Zip
Seattle, WA 98105
3e. Phone (1) 3f. Phone (2) 3g. Fax 3h. E-mail
206/407-5859 mark@waterfrontconstruction.com
Part 4–Property Owner(s)
Contact information for people or organizations owning the property(ies) where the project will occur. Consider both upland and aquatic ownership because the upland owners may not own the adjacent aquatic land. [help]
☒ Same as applicant. (Skip to Part 5.)
☐ Repair or maintenance activities on existing rights-of-way or easements. (Skip to Part 5.)
☐ There are multiple upland property owners. Complete the section below and fill out JARPA Attachment A for
each additional property owner.
☐ Your project is on Department of Natural Resources (DNR)-managed aquatic lands. If you don’t know, contact
the DNR at (360) 902-1100 to determine aquatic land ownership. If yes, complete JARPA Attachment E to
apply for the Aquatic Use Authorization.
4a. Name (Last, First, Middle)
4b. Organization (If applicable)
4c. Mailing Address (Street or PO Box)
4d. City, State, Zip
4e. Phone (1) 4f. Phone (2) 4g. Fax 4h. E-mail
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Part 5–Project Location(s)
Identifying information about the property or properties where the project will occur. [help]
☐ There are multiple project locations (e.g. linear projects). Complete the section below and use JARPA
Attachment B for each additional project location.
5a. Indicate the type of ownership of the property. (Check all that apply.) [help]
☒ Private
☐ Federal
☐ Publicly owned (state, county, city, special districts like schools, ports, etc.)
☐ Tribal
☐ Department of Natural Resources (DNR) – managed aquatic lands (Complete JARPA Attachment E)
5b. Street Address (Cannot be a PO Box. If there is no address, provide other location information in 5p.) [help]
1053 Lake Washington Blvd N
5c. City, State, Zip (If the project is not in a city or town, provide the name of the nearest city or town.) [help]
Renton, WA 98056
5d. County [help]
King
5e. Provide the section, township, and range for the project location. [help]
¼ Section Section Township Range
NW 8 23 5
5f. Provide the latitude and longitude of the project location. [help]
• Example: 47.03922 N lat. / -122.89142 W long. (Use decimal degrees - NAD 83)
LAT: 47.5029 LONG: -122.2050
5g. List the tax parcel number(s) for the project location. [help]
• The local county assessor’s office can provide this information.
0523059075
5h. Contact information for all adjoining property owners. (If you need more space, use JARPA Attachment C.) [help]
Name Mailing Address Tax Parcel # (if known)
KW Bristol at Southport LLC 1073 Lake Washington Blvd N 052305-9076 Renton, WA 98056
The Boeing Company 737 Logan Ave N 072305-9001 Renton, WA 98055
5i. List all wetlands on or adjacent to the project location. [help]
None known
5j. List all waterbodies (other than wetlands) on or adjacent to the project location. [help]
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Lake Washington
5k. Is any part of the project area within a 100-year floodplain? [help]
☐ Yes ☐ No ☒ Don’t know
5l. Briefly describe the vegetation and habitat conditions on the property. [help]
Existing vegetation is quite sparse and limited to the parking lot and further upland.
5m. Describe how the property is currently used. [help]
Commercial multi-occupant hotel.
5n. Describe how the adjacent properties are currently used. [help]
A manufacturing plant and a private multi-family dwelling.
5o. Describe the structures (above and below ground) on the property, including their purpose(s) and current condition. [help]
Parking lot, restaurants, swimming pool, public entrance, business center and exercise facilities appear in good
condition.
5p. Provide driving directions from the closest highway to the project location, and attach a map. [help]
From I-5 North: At Exit 168B, head right on the ramp for WA-520 toward Bellevue / Kirkland.
Take the ramp on the right for E Lake Washington Blvd and head toward Montlake Blvd. Keep straight to get onto E Lake Washington Blvd. Road name changes to Lake Washington Blvd E. Road name changes to Lake Washington Blvd. Arrive at Lake Washington Blvd on the left.
Part 6–Project Description
6a. Briefly summarize the overall project. You can provide more detail in 6b. [help]
Conduct eleven (11) pile splices to existing float pier, per plan. Remove eight (8) derelict piles. No excavation or fill is proposed.
6b. Describe the purpose of the project and why you want or need to perform it. [help]
The purpose of the project is to repair the damaged elements under the structure and pier to extend the overall lifetime of the structure.
6c. Indicate the project category. (Check all that apply) [help]
☒ Commercial ☐ Residential ☐ Institutional ☐ Transportation ☐ Recreational
☐ Maintenance ☐ Environmental Enhancement
6d. Indicate the major elements of your project. (Check all that apply) [help]
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☐ Aquaculture
☐ Bank Stabilization
☐ Boat House
☐ Boat Launch
☐ Boat Lift
☐ Bridge
☐ Bulkhead
☐ Buoy
☐ Channel Modification
☐ Culvert
☐ Dam / Weir
☐ Dike / Levee / Jetty
☐ Ditch
☐ Dock / Pier
☐ Dredging
☐ Fence
☐ Ferry Terminal
☐ Fishway
☒ Float
☐ Floating Home
☐ Geotechnical Survey
☐ Land Clearing
☐ Marina / Moorage
☐ Mining
☐ Outfall Structure
☒ Piling/Dolphin
☐ Raft
☐ Retaining Wall
(upland)
☐ Road
☐ Scientific
Measurement Device
☐ Stairs
☐ Stormwater facility
☐ Swimming Pool
☐ Utility Line
☐ Other:
6e. Describe how you plan to construct each project element checked in 6d. Include specific construction methods and equipment to be used. [help]
• Identify where each element will occur in relation to the nearest waterbody.
• Indicate which activities are within the 100-year floodplain.
1) Mobilization of crane and utility barge;
2) Remove eight (8) derelict piles;
3) Splice eleven (11) internal float piles;
o All splices will be prefabricated at contractor’s Seattle shop.
o Divers will install all splices using hand tools under the building.
o Splices are secured with ¾ inch through bolts and batters will be attached to vertical
piles.
4) All old wood piles will be hauled out and discarded in an approved upland renew container.
6f. What are the anticipated start and end dates for project construction? (Month/Year) [help]
• If the project will be constructed in phases or stages, use JARPA Attachment D to list the start and end dates of each phase or stage.
Start Date: ASAP End Date: Within work windows ☐ See JARPA Attachment D
6g. Fair market value of the project, including materials, labor, machine rentals, etc. [help]
$58000
6h. Will any portion of the project receive federal funding? [help]
• If yes, list each agency providing funds.
☐ Yes ☒ No ☐ Don’t know
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Part 7–Wetlands: Impacts and Mitigation
☐ Check here if there are wetlands or wetland buffers on or adjacent to the project area.
(If there are none, skip to Part 8.) [help]
7a. Describe how the project has been designed to avoid and minimize adverse impacts to wetlands. [help]
☐ Not applicable
7b. Will the project impact wetlands? [help]
☐ Yes ☐ No ☐ Don’t know
7c. Will the project impact wetland buffers? [help]
☐ Yes ☐ No ☐ Don’t know
7d. Has a wetland delineation report been prepared? [help]
• If Yes, submit the report, including data sheets, with the JARPA package.
☐ Yes ☐ No
7e. Have the wetlands been rated using the Western Washington or Eastern Washington Wetland Rating
System? [help]
• If Yes, submit the wetland rating forms and figures with the JARPA package.
☐ Yes ☐ No ☐ Don’t know
7f. Have you prepared a mitigation plan to compensate for any adverse impacts to wetlands? [help]
• If Yes, submit the plan with the JARPA package and answer 7g.
• If No, or Not applicable, explain below why a mitigation plan should not be required.
☐ Yes ☐ No ☐ Don’t know
7g. Summarize what the mitigation plan is meant to accomplish, and describe how a watershed approach was used to design the plan. [help]
7h. Use the table below to list the type and rating of each wetland impacted, the extent and duration of the impact, and the type and amount of mitigation proposed. Or if you are submitting a mitigation plan with a similar table, you can state (below) where we can find this information in the plan. [help]
Activity (fill, drain, excavate, flood, etc.)
Wetland Name1 Wetland type and rating category2
Impact area (sq. ft. or Acres)
Duration of impact3 Proposed mitigation type4
Wetland mitigation area (sq. ft. or acres)
1 If no official name for the wetland exists, create a unique name (such as “Wetland 1”). The name should be consistent with other project documents, such as a wetland delineation report. 2 Ecology wetland category based on current Western Washington or Eastern Washington Wetland Rating System. Provide the wetland rating forms with the JARPA package. 3 Indicate the days, months or years the wetland will be measurably impacted by the activity. Enter “permanent” if applicable. 4 Creation (C), Re-establishment/Rehabilitation (R), Enhancement (E), Preservation (P), Mitigation Bank/In-lieu fee (B)
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ORIA-revised 02/2020 Page 7 of 12
Page number(s) for similar information in the mitigation plan, if available:
7i. For all filling activities identified in 7h, describe the source and nature of the fill material, the amount in cubic yards that will be used, and how and where it will be placed into the wetland. [help]
7j. For all excavating activities identified in 7h, describe the excavation method, type and amount of material in cubic yards you will remove, and where the material will be disposed. [help]
Part 8–Waterbodies (other than wetlands): Impacts and Mitigation
In Part 8, “waterbodies” refers to non-wetland waterbodies. (See Part 7 for information related to wetlands.) [help]
☒ Check here if there are waterbodies on or adjacent to the project area. (If there are none, skip to Part 9.)
8a. Describe how the project is designed to avoid and minimize adverse impacts to the aquatic environment.
[help]
☐ Not applicable
All demoed materials will be placed in a container on the barge and disposed of in an upland facility,
mitigation will be completed as needed.
8b. Will your project impact a waterbody or the area around a waterbody? [help]
☒ Yes ☐ No
8c. Have you prepared a mitigation plan to compensate for the project’s adverse impacts to non-wetland waterbodies? [help]
• If Yes, submit the plan with the JARPA package and answer 8d.
• If No, or Not applicable, explain below why a mitigation plan should not be required.
☐ Yes ☒ No ☐ Don’t know
Applicant agrees to comply with the NMFS Restoration and Permitting (RAP) Programmatic to ensure a no net loss of environmental impact.
8d. Summarize what the mitigation plan is meant to accomplish. Describe how a watershed approach was used to design the plan.
• If you already completed 7g you do not need to restate your answer here. [help]
N/A
8e. Summarize impact(s) to each waterbody in the table below. [help]
Activity (clear, dredge, fill, pile drive, etc.)
Waterbody name1 Impact location2 Duration of impact3
Amount of material (cubic yards) to be placed in or removed from waterbody
Area (sq. ft. or linear ft.) of waterbody directly affected
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1 If no official name for the waterbody exists, create a unique name (such as “Stream 1”) The name should be consistent with other documents provided. 2 Indicate whether the impact will occur in or adjacent to the waterbody. If adjacent, provide the distance between the impact and the waterbody and indicate whether the impact will occur within the 100-year flood plain. 3 Indicate the days, months or years the waterbody will be measurably impacted by the work. Enter “permanent” if applicable.
8f. For all activities identified in 8e, describe the source and nature of the fill material, amount (in cubic yards) you will use, and how and where it will be placed into the waterbody. [help]
None proposed.
8g. For all excavating or dredging activities identified in 8e, describe the method for excavating or dredging, type and amount of material you will remove, and where the material will be disposed. [help]
None proposed.
Part 9–Additional Information
Any additional information you can provide helps the reviewer(s) understand your project. Complete as much of this section as you can. It is ok if you cannot answer a question.
9a. If you have already worked with any government agencies on this project, list them below. [help]
Agency Name Contact Name Phone Most Recent Date of Contact
City of Renton Planning Customer Service 425/430-7294 4/10/25
9b. Are any of the wetlands or waterbodies identified in Part 7 or Part 8 of this JARPA on the Washington
Department of Ecology’s 303(d) List? [help]
• If Yes, list the parameter(s) below.
• If you don’t know, use Washington Department of Ecology’s Water Quality Assessment tools at: https://ecology.wa.gov/Water-Shorelines/Water-quality/Water-improvement/Assessment-of-state-waters-303d.
☐ Yes ☒ No
9c. What U.S. Geological Survey Hydrological Unit Code (HUC) is the project in? [help]
• Go to http://cfpub.epa.gov/surf/locate/index.cfm to help identify the HUC.
Lake Washington Watershed 17110012
9d. What Water Resource Inventory Area Number (WRIA #) is the project in? [help]
• Go to https://ecology.wa.gov/Water-Shorelines/Water-supply/Water-availability/Watershed-look-up to find the WRIA #.
8 Cedar Sammamish
9e. Will the in-water construction work comply with the State of Washington water quality standards for turbidity? [help]
• Go to https://ecology.wa.gov/Water-Shorelines/Water-quality/Freshwater/Surface-water-quality-standards/Criteria for the standards.
☒ Yes ☐ No ☐ Not applicable
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9f. If the project is within the jurisdiction of the Shoreline Management Act, what is the local shoreline
environment designation? [help]
• If you don’t know, contact the local planning department.
• For more information, go to: https://ecology.wa.gov/Water-Shorelines/Shoreline-coastal-management/Shoreline-coastal-
planning/Shoreline-laws-rules-and-cases.
☒ Urban ☐ Natural ☐ Aquatic ☐ Conservancy ☐ Other:
9g. What is the Washington Department of Natural Resources Water Type? [help]
• Go to http://www.dnr.wa.gov/forest-practices-water-typing for the Forest Practices Water Typing System.
☒ Shoreline ☐ Fish ☐ Non-Fish Perennial ☐ Non-Fish Seasonal
9h. Will this project be designed to meet the Washington Department of Ecology’s most current stormwater manual? [help]
• If No, provide the name of the manual your project is designed to meet.
☒ Yes ☐ No
Name of manual:
9i. Does the project site have known contaminated sediment? [help]
• If Yes, please describe below.
☐ Yes ☒ No
9j. If you know what the property was used for in the past, describe below. [help]
Not known
9k. Has a cultural resource (archaeological) survey been performed on the project area? [help]
• If Yes, attach it to your JARPA package.
☐ Yes ☒ No
9l. Name each species listed under the federal Endangered Species Act that occurs in the vicinity of the
project area or might be affected by the proposed work. [help]
Marbled Murrelet, Puget Sound Chinook, Puget sound Steelhead, Bull Trout
9m. Name each species or habitat on the Washington Department of Fish and Wildlife’s Priority Habitats and Species List that might be affected by the proposed work. [help]
Marbled Murrelet, Puget Sound Chinook, Puget Sound Steelhead Puget Sound Coho, Kokanee Bull Trout,
Rainbow Trout, Sockeye
Part 10–SEPA Compliance and Permits
Use the resources and checklist below to identify the permits you are applying for.
• Online Project Questionnaire at http://apps.oria.wa.gov/opas/.
• Governor’s Office for Regulatory Innovation and Assistance at (800) 917-0043 or help@oria.wa.gov.
• For a list of addresses to send your JARPA to, click on agency addresses for completed JARPA.
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10a. Compliance with the State Environmental Policy Act (SEPA). (Check all that apply.) [help]
• For more information about SEPA, go to https://ecology.wa.gov/regulations-permits/SEPA-environmental-review.
☐ A copy of the SEPA determination or letter of exemption is included with this application.
☐ A SEPA determination is pending with (lead agency). The expected decision date
is .
☐ I am applying for a Fish Habitat Enhancement Exemption. (Check the box below in 10b.) [help]
☒ This project is exempt (choose type of exemption below).
☒ Categorical Exemption. Under what section of the SEPA administrative code (WAC) is it exempt?
WAC 197-11-800 (3) Repair, remodeling and maintenance activities
☐ Other:
☐ SEPA is pre-empted by federal law.
10b. Indicate the permits you are applying for. (Check all that apply.) [help]
LOCAL GOVERNMENT
Local Government Shoreline permits:
☐ Substantial Development ☐ Conditional Use ☐ Variance
☒ Shoreline Exemption Type (explain): WAC 173-27-040.2 (exempt as maintenance and repair)
Other City/County permits:
☐ Floodplain Development Permit ☐ Critical Areas Ordinance
STATE GOVERNMENT
Washington Department of Fish and Wildlife:
☒ Hydraulic Project Approval (HPA) ☐ Fish Habitat Enhancement Exemption – Attach Exemption Form
Washington Department of Natural Resources:
☐ Aquatic Use Authorization
Complete JARPA Attachment E and submit a check for $25 payable to the Washington Department of Natural Resources.
Do not send cash.
Washington Department of Ecology:
☐ Section 401 Water Quality Certification ☐ Non-Federally Regulated Waters
FEDERAL AND TRIBAL GOVERNMENT
United States Department of the Army (U.S. Army Corps of Engineers):
☐ Section 404 (discharges into waters of the U.S.) ☒ Section 10 (work in navigable waters)
United States Coast Guard: For projects or bridges over waters of the United States, contact the U.S. Coast Guard at: d13-pf-d13bridges@uscg.mil
☐ Bridge Permit ☐ Private Aids to Navigation (or other non-bridge permits)
United States Environmental Protection Agency:
☐ Section 401 Water Quality Certification (discharges into waters of the U.S.) on tribal lands where tribes do
not have treatment as a state (TAS)
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Tribal Permits: (Check with the tribe to see if there are other tribal permits, e.g., Tribal Environmental Protection Act, Shoreline
Permits, Hydraulic Project Permits, or other in addition to CWA Section 401 WQC)
☐ Section 401 Water Quality Certification (discharges into waters of the U.S.) where the tribe has treatment
as a state (TAS).
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
www.pacificsws.com
Construction Stormwater Pollution Prevention Plan October 13, 2025
Hyatt Regency, Renton, Washington Page 20
APPENDIX D – ALTERNATIVE BMPS
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
The following includes a list of possible alternative BMPs from the 2025 Stormwater Management
Manual for Western Washington for that are not included in the main CSWPPP text. This list can be
referenced in the event a BMP for a specific element is not functioning as designed and an
alternative BMP needs to be implemented.
Clearing Limits
• BMP C103: High-Visibility Fence
• BMP C233: Silt Fence
Cover Measures
• BMP C120: Temporary and Permanent Seeding
• BMP C121: Mulching
• BMP C122: Nets and Blankets
• BMP C123: Plastic Covering
• BMP C124: Sodding
• BMP C130: Surface Roughening
• BMP C131: Gradient Terraces
Perimeter Protection
• BMP C101: Preserving Natural Vegetation
• BMP C102: Buffer Zones
• BMP C231: Brush Barrier
• BMP C232: Gravel Filter Berm
• BMP C233: Silt Fence
• BMP C234: Vegetated Strip
• BMP C235: Wattles
• BMP C208: Triangular Silt Dike (TSD)
Traffic Area Stabilization
• BMP C105: Stabilized Construction Access
• BMP C106: Wheel Wash
• BMP C107: Construction Road / Parking Area Stabilization
Sediment Retention
• BMP C234: Vegetated Strip
• BMP C240: Sediment Trap
• BMP C241: Sediment Pond (Temporary)
• BMP C220: Inlet Protection
Surface Water Collection
• BMP C200: Interceptor Dike and Swale
• BMP C201: Grass-Lined Channels
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
• BMP C202: Riprap Channel Lining
• BMP C203: Water Bars
• BMP C204: Pipe Slope Drains
• BMP C205: Subsurface Drains
• BMP C206: Level Spreader
• BMP C207: Check Dams
• BMP C209: Outlet Protection
Dewatering Control
• BMP C203: Water Bars
• BMP C236: Vegetative Filtration
Dust Control
• BMP C140: Dust Control
Flow Control
• BMP C200: Interceptor Dike and Swale
• BMP C201: Grass-Lined Channels
• BMP C203: Water Bars
• BMP C204: Pipe Slope Drains
• BMP C205: Subsurface Drains
• BMP C206: Level Spreader
• BMP C207: Check Dams
• BMP C209: Outlet Protection
Protect Facilities and BMPs
• BMP C102: Buffer Zones
• BMP C103: High-Visibility Fence
• BMP C200: Interceptor Dike and Swale
• BMP C201: Grass-Lined Channels
• BMP C207: Check Dams
• BMP C208: Triangular Silt Dike (TSD)
• BMP C231: Brush Barrier
• BMP C233: Silt Fence
• BMP C234: Vegetated Strip
Maintain BMPs
• BMP C150: Materials on Hand
• BMP C160: Certified Erosion and Sediment Control Lead
Manage the Project
• BMP C150: Materials on Hand
• BMP C160: Certified Erosion and Sediment Control Lead
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
• BMP C162: Scheduling
Pollution Prevention
• BMP C151: Concrete Handling
• BMP C152: Sawcutting and Surfacing Pollution Prevention
• BMP C153: Material Delivery, Storage, and Containment
• BMP C154: Concrete Washout Area
• BMP C250: Construction Stormwater Chemical Treatment
• BMP C251: Construction Stormwater Filtration
• BMP C252: Treating and Disposing of High pH Water
• BMP C250: Construction Stormwater Chemical Treatment
• BMP C251: Construction Stormwater Filtration
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
www.pacificsws.com
Construction Stormwater Pollution Prevention Plan October 13, 2025
Hyatt Regency, Renton, Washington Page 21
APPENDIX E – PROJECT FORMS
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Construction Stormwater Site Inspection Form
Page 1
Project Name Permit # Inspection Date Time
Name of Certified Erosion Sediment Control Lead (CESCL) or qualified inspector if less than one acre
Print Name:
Approximate rainfall amount since the last inspection (in inches):
Approximate rainfall amount in the last 24 hours (in inches):
Current Weather Clear Cloudy Mist Rain Wind Fog
A. Type of inspection: Weekly Post Storm Event Other
B. Phase of Active Construction (check all that apply):
Pre Construction/installation of erosion/sediment
controls
Clearing/Demo/Grading Infrastructure/storm/roads
Concrete pours Vertical
Construction/buildings
Utilities
Offsite improvements Site temporary stabilized Final stabilization
C. Questions:
1. Were all areas of construction and discharge points inspected? Yes No
2. Did you observe the presence of suspended sediment, turbidity, discoloration, or oil sheen Yes No
3. Was a water quality sample taken during inspection? (refer to permit conditions S4 & S5) Yes No
4. Was there a turbid discharge 250 NTU or greater, or Transparency 6 cm or less?* Yes No
5. If yes to #4 was it reported to Ecology? Yes No
6. Is pH sampling required? pH range required is 6.5 to 8.5. Yes No
If answering yes to a discharge, describe the event. Include when, where, and why it happened; what action was taken,
and when.
*If answering yes to # 4 record NTU/Transparency with continual sampling daily until turbidity is 25 NTU or less/ transparency is 33 cm or greater.
Sampling Results: Date:
Parameter Method (circle one) Result Other/Note
NTU cm pH
Turbidity tube, meter, laboratory
pH Paper, kit, meter
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Construction Stormwater Site Inspection Form
Page 2
D. Check the observed status of all items. Provide “Action Required “details and dates.
Element # Inspection BMPs
Inspected
BMP needs
maintenance
BMP
failed
Action
required
(describe in
section F)
yes no n/a
1
Clearing
Limits
Before beginning land disturbing
activities are all clearing limits,
natural resource areas (streams,
wetlands, buffers, trees) protected
with barriers or similar BMPs? (high
visibility recommended)
2
Construction
Access
Construction access is stabilized
with quarry spalls or equivalent
BMP to prevent sediment from
being tracked onto roads?
Sediment tracked onto the road
way was cleaned thoroughly at the
end of the day or more frequent as
necessary.
3
Control Flow
Rates
Are flow control measures installed
to control stormwater volumes and
velocity during construction and do
they protect downstream
properties and waterways from
erosion?
If permanent infiltration ponds are
used for flow control during
construction, are they protected
from siltation?
4
Sediment
Controls
All perimeter sediment controls
(e.g. silt fence, wattles, compost
socks, berms, etc.) installed, and
maintained in accordance with the
Stormwater Pollution Prevention
Plan (SWPPP).
Sediment control BMPs (sediment
ponds, traps, filters etc.) have been
constructed and functional as the
first step of grading.
Stormwater runoff from disturbed
areas is directed to sediment
removal BMP.
5
Stabilize
Soils
Have exposed un-worked soils
been stabilized with effective BMP
to prevent erosion and sediment
deposition?
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Construction Stormwater Site Inspection Form
Page 3
Element # Inspection BMPs
Inspected
BMP needs
maintenance
BMP
failed
Action
required
(describe in
section F)
yes no n/a
5
Stabilize Soils
Cont.
Are stockpiles stabilized from erosion,
protected with sediment trapping
measures and located away from drain
inlet, waterways, and drainage
channels?
Have soils been stabilized at the end of
the shift, before a holiday or weekend
if needed based on the weather
forecast?
6
Protect
Slopes
Has stormwater and ground water
been diverted away from slopes and
disturbed areas with interceptor dikes,
pipes and or swales?
Is off-site storm water managed separately from stormwater generated
on the site?
Is excavated material placed on uphill
side of trenches consistent with safety
and space considerations?
Have check dams been placed at
regular intervals within constructed
channels that are cut down a slope?
7
Drain Inlets
Storm drain inlets made operable
during construction are protected.
Are existing storm drains within the
influence of the project protected?
8
Stabilize
Channel and
Outlets
Have all on-site conveyance channels
been designed, constructed and
stabilized to prevent erosion from
expected peak flows?
Is stabilization, including armoring
material, adequate to prevent erosion
of outlets, adjacent stream banks, slopes and downstream conveyance
systems?
9
Control
Pollutants
Are waste materials and demolition
debris handled and disposed of to
prevent contamination of stormwater?
Has cover been provided for all
chemicals, liquid products, petroleum
products, and other material?
Has secondary containment been
provided capable of containing 110%
of the volume?
Were contaminated surfaces cleaned
immediately after a spill incident?
Were BMPs used to prevent
contamination of stormwater by a pH
modifying sources?
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Construction Stormwater Site Inspection Form
Page 4
Element # Inspection BMPs
Inspected
BMP needs
maintenance
BMP
failed
Action
required
(describe in
section F)
yes no n/a
9
Cont.
Wheel wash wastewater is handled
and disposed of properly.
10 Control
Dewatering
Concrete washout in designated areas. No washout or excess concrete on the
ground.
Dewatering has been done to an
approved source and in compliance
with the SWPPP.
Were there any clean non turbid
dewatering discharges?
11
Maintain
BMP
Are all temporary and permanent
erosion and sediment control BMPs
maintained to perform as intended?
12
Manage the
Project
Has the project been phased to the
maximum degree practicable?
Has regular inspection, monitoring and
maintenance been performed as
required by the permit?
Has the SWPPP been updated,
implemented and records maintained?
13
Protect LID
Is all Bioretention and Rain Garden
Facilities protected from
sedimentation with appropriate BMPs?
Is the Bioretention and Rain Garden
protected against over compaction of
construction equipment and foot
traffic to retain its infiltration
capabilities?
Permeable pavements are clean and free of sediment and sediment laden-water runoff. Muddy construction
equipment has not been on the base
material or pavement.
Have soiled permeable pavements
been cleaned of sediments and pass
infiltration test as required by stormwater manual methodology?
Heavy equipment has been kept off
existing soils under LID facilities to
retain infiltration rate.
E. Check all areas that have been inspected.
All in place BMPs All disturbed soils All concrete wash out area All material storage areas
All discharge locations All equipment storage areas All construction entrances/exits
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
Construction Stormwater Site Inspection Form
Page 5
F. Elements checked “Action Required” (section D) describe corrective action to be taken. List the element number;
be specific on location and work needed. Document, initial, and date when the corrective action has been completed
and inspected.
Element
#
Description and Location Action Required Completion
Date
Initials
Attach additional page if needed
Sign the following certification:
“I certify that this report is true, accurate, and complete, to the best of my knowledge and belief”
Inspected by: (print) (Signature) Date:
Title/Qualification of Inspector:
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
SECTION D.4 REFERENCE SECTION
6/22/2022 2022 City of Renton Surface Water Design Manual
D-130
D.4.3 ESC AND SWPPS MAINTENANCE REPORTS
CED may require a written record of all maintenance activities to be kept to demonstrate compliance with
the Maintenance Requirements (Section D.2.4.4). A standard ESC Maintenance Report is provided on the
next page and typical SWPPS Maintenance Reports follow. Copies of the ESC and SWPPS Maintenance
Reports must be kept on site throughout the duration of construction.
E S C M A I N T E N A N C E R E P O R T
Performed By: ___________________________
Date: ___________________________
Project Name: ___________________________
CED Permit #: ___________________________
Clearing Limits
Damage OK Problem
Visible OK Problem
Intrusions OK Problem
Other OK Problem
Mulch
Rills/Gullies OK Problem
Thickness OK Problem
Other OK Problem
Nets/Blankets
Rills/Gullies OK Problem
Ground Contact OK Problem
Other OK Problem
Plastic
Tears/Gaps OK Problem
Other OK Problem
Seeding
Percent Cover OK Problem
Rills/Gullies OK Problem
Mulch OK Problem
Other OK Problem
Sodding
Grass Health OK Problem
Rills/Gullies OK Problem
Other OK Problem
Perimeter Protection Including Silt Fence
Damage OK Problem
Sediment Build-up OK Problem
Concentrated Flow OK Problem
Other OK Problem
BMP/Facility Protection
Damage OK Problem
Sedimentation OK Problem
Concentrated Flow OK Problem
Rills/Gullies OK Problem
Intrusions OK Problem
Other OK Problem
Brush Barrier
Damage OK Problem
Sediment Build-up OK Problem
Concentrated Flow OK Problem
Other OK Problem
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
D.4.3 ESC AND SWPPS MAINTENANCE REPORTS
2022 City of Renton Surface Water Design Manual 6/22/2022
D-131
Vegetated Strip
Damage OK Problem
Sediment Build-up OK Problem
Concentrated Flow OK Problem
Other OK Problem
Construction Entrance
Dimensions OK Problem
Sediment Tracking OK Problem
Vehicle Avoidance OK Problem
Other OK Problem
Wheel Wash
Dimensions OK Problem
Sed buildup or tracking OK . Problem
Other OK Problem
Construction Road
Stable Driving Surf. OK Problem
Vehicle Avoidance OK Problem
Other OK Problem
Sediment Trap/Pond
Sed. Accumulation OK Problem
Overtopping OK Problem
Inlet/Outlet Erosion OK Problem
Other OK Problem
Catch Basin/Inlet Protection
Sed. Accumulation OK Problem
Damage OK Problem
Clogged Filter OK Problem
Other OK Problem
Interceptor Dike/Swale
Damage OK Problem
Sed. Accumulation OK Problem
Overtopping OK Problem
Other OK Problem
Pipe Slope Drain
Damage OK Problem
Inlet/Outlet OK Problem
Secure Fittings OK Problem
Other OK Problem
Ditches
Damage OK Problem
Sed. Accumulation OK Problem
Overtopping OK Problem
Other OK Problem
Outlet Protection
Scour OK Problem
Other OK Problem
Level Spreader
Damage OK Problem
Concentrated Flow OK Problem
Rills/Gullies OK Problem
Sed. Accumulation OK Problem
Other OK Problem
Dewatering Controls
Sediment OK Problem
Dust Control
Palliative applied OK Problem
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744
SECTION D.4 REFERENCE SECTION
6/22/2022 2022 City of Renton Surface Water Design Manual
D-132
Miscellaneous
Wet Season Stockpile OK Problem
Other OK Problem
Comments:
Actions Taken:
Problems Unresolved:
Docusign Envelope ID: 91048D1A-31F5-4E3C-8582-8543E2233744