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Boulevard Lane Park Play Area Rehab
Full Drainage Review
Project No. 1144528
June 2024
Department of Natural Resources and Parks
Division of Parks and Recreation
King Street Center Building KSC-NR-5702 201 South Jackson Street
Seattle, WA 98104
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Boulevard Lane Park Play Area Rehab
Full Drainage Review
Project Name: Boulevard Lane Park Play Area Rehab
Project Number: 1144528
Funded by: Parks Levy
Prepared For: City of Renton– Permitting Services
Prepared By: Collin Bond, E.I.T., King County Parks
Reviewed and Approved By: Jon Polka, P.E., King County Parks
Department of Natural Resources and Parks
Division of Parks and Recreation King Street Center Building KSC-NR-5702
201 South Jackson Street
Seattle, WA 98104
6/5/2024
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TABLE OF CONTENTS
TABLE OF CONTENTS ......................................................................................................................1
SECTION I: PROJECT OVERVIEW ...................................................................................................2
Project Description .................................................................................................................11
Existing Site Conditions .........................................................................................................12
Proposed Conditions ...............................................................................................................13
Soils ........................................................................................................................................17
SECTION II: CONDITIONS AND REQUIREMENTS SUMMARY ........................................................19
Core Requirements .................................................................................................................19
Special Requirements .............................................................................................................19
SECTION III: OFFSITE ANALYSIS .................................................................................................21
Task 1: Study Area .................................................................................................................21
Task 2: Resource Review .......................................................................................................21
Task 3: Field Inspection ..........................................................................................................21
Task 4: Drainage System Description and Problem Descriptions ..........................................21
Task 5: Mitigation of Existing or Potential Problems ............................................................22
SECTION IV: FLOW CONTROL, LOW IMPACT DEVELOPMENT (LID) AND WATER QUALITY
FACILITY ANALYSIS AND DESIGN .................................................................................................23
Flow Control (Core Requirement #3) .....................................................................................23
Water Quality (Core Requirement #8) ...................................................................................23
On-Site BMPs (Core Requirement #9) ...................................................................................23
SECTION V: CONVEYANCE SYSTEM ANALYSIS AND DESIGN .......................................................26
SECTION VI: SPECIAL REPORTS AND STUDIES ............................................................................26
SECTION VII: OTHER PERMITS ....................................................................................................26
SECTION VIII: CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN (CSWPPP)
ANALYSIS AND DESIGN ..................................................................................................................27
Erosion and Sediment Control Analysis and Design (Part A) ................................................27
Erosion and Sediment Control Standard Measures ...........................................................27
Stormwater Pollution Prevention and Spill Plan Design (Part B) ..........................................28
Stormwater Pollution Prevention and Spill Activity Measures .........................................28
SECTION IX: BOND, QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT 29
SECTION X: OPERATIONS AND MAINTENANCE MANUAL ............................................................29
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SECTION I: PROJECT OVERVIEW
FIGURE 1A: DRAINAGE REVIEW FLOW CHART
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FIGURE 1B: DRAINAGE REVIEW REQUIREMENTS
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Figure 1C: TIR Worksheet
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Project Description
This Technical Information Report is for a project that will convert 2,450 square feet of FIBAR
to artificial turf and replace 750 square feet of asphalt for the rehabilitation of the Boulevard
Lane Park play area. The project location is in the city of Renton on SE 188th Pl, Renton WA
98058 and is shown in Figure 2A. The project site is adjacent to a wetland north and west of the
site. A majority of the project site is also adjacent to the 100-year floodplain, but a small portion
of the site is located within the floodplain and is shown in Figure 2B.
FIGURE 2A: VICINITY MAP
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FIGURE 2B: CRITICAL AREAS
Background
The play area at Boulevard Lane Park was constructed in the early 1970s.This project is part of a
King County Parks Levy commitment and must be constructed in before 2025. Most children
who use the park are under the age of 13. It would be safer for the play area to have a continuous
synthetic surface rather than the existing FIBAR. Hence, the conversion of the FIBAR to turf in
the play area. In addition to the play area renovation, the project walkway is out of ADA
compliance due to long-term settlement. Thus, the pathway will be replaced in-kind to bring it
back into ADA compliance. The restroom facility on-site has been out of use for three years and
has been replaced with a portable restroom. The restroom facility will be demolished, and the
sewer and water lines will be capped at the edge of the road on SE 188th Pl.
Existing Site Conditions
The project site is approximately 12,500 square feet located on the southern side of Boulevard
Lane Park. The overall parcel is approximately 16.8-acres. The park is bordered to the north and
west by a wetland and Big Soos Creek, to the east by residential development, to the south by a
playfield for Meeker Middle School. The park play area is 2,450 square feet with FIBAR
surface. This project proposes to renovate the play area equipment and replace the existing
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FIBAR with a non-pollution generating artificial turf while maintaining the play area benches
which are heavily used and being relocated outside of the play area footprint. Existing drainage
from the play area is collected in an underdrain beneath the play area and conveyed to the
wetland on the western border of the park before it enters Big Soos Creek. Stormwater runoff for
approximately 70 acres of residential area east and northeast of the park bypasses the park
through a 24” concrete pipe that outlets in the wetland northwest of the project. The proposed
work for this project will not impact the existing 24” pipe. Stormwater runoff for the areas north
and south of the project site sheet flows east into Big Soos Creek.
FIGURE 3A: DOWNSTREAM DRAINAGE
Proposed Conditions
The primary project elements, as it relates to stormwater management include the following:
• The project will remove 2,450 square feet (0.056 ac.) of existing FIBAR in in the play
area to a depth of 8 inches and replace it with a non-pollution generating artificial turf
system.
o The play area will continue to be served by an underdrain system. This project
will convey that drainage to a proposed gravel-filled dispersion trench that will
spread flow into a native vegetated flow path towards the wetland/stream area to
the west.
• The project also includes replacing in-kind 785 feet of non-pollution generating walkway.
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o The replaced non-pollution generating walkway will be sloped to one side, and a
gravel strip will be installed to achieve basic dispersion.
• Two concrete bench pads and benches will be installed, which results in 80 square feet of
non-pollution generating impervious surface.
• The project also includes demolition the restroom and the adjacent pathways resulting in
the removal of 915 square feet of impervious surface.
• The project also includes tree maintenance activities described the project’s Tree Memo.
See Figure 3B for the layout plan of the proposed design. Table 1 contains a summary of TDA
areas for proposed conditions per the Site Plan. Refer to Table 2 for detailed accounting of TDA
areas on-site.
FIGURE 3B: PROPOSED IMPROVEMENTS
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TABLE 1: TDA SUMMARY
Site
Plan
Note
Description SWDM Type Adjust
Area for
TDA (sf)
Discussion
1 Replace playground
equipment,
surfacing, and
underdrain system.
2,450
3 Install two new
concrete bench pads.
80 Imperious surface that is moved
from one location (Site Plan No.
6) to another site (Site Plan
No.3), meeting both conditions
A and B per the SWDM
definition of “Replaced
Impervious Surface”. A portion
of the removed restroom and
adjacent walkway will
effectively be re-established as
concrete bench pads, as a form
of replaced impervious surface.
8 Replace existing
asphalt pathway.
785
Total Replaced Non-
Pollution Generating
Impervious Surface
(sf)
3,315
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TABLE 2: TDA FULL ACCOUNTING
Site Plan
Note
Description SWDM TDA
Type
Measured
Area (sf)
Adjust Area
for TDA (sf)
Discussion
1 Replace playground
equipment, surfacing,
and underdrain
system.
Replaced Non-
Pollution
Generating
Impervious
Surface
2,450 2,450
2 Remove two 9’ x 4’
concrete bench pads.
N/A 0 0 Included in Site Plan #1
3 Install two new
concrete bench pads.
Replaced Non-
Pollution
Generating
Impervious
Surface
80 80 Imperious surface that is moved
from one location (Site Plan No.
6) to another site (Site Plan
No.3), meeting both conditions
A and B per the SWDM
definition of “Replaced
Impervious Surface”.
4 Remove 50 LF of
retaining wall.
Regrade 3H:1V or
flatter slope.
0 0 Existing condition has negligible
footprint.
5 Remove 95 LF of
retaining wall.
Regrade 3H:1V or
flatter slope.
0 0 Existing condition has negligible
footprint.
6 Remove existing
asphalt and restore
with native
vegetation and
mulch.
-605 0 Reverted from impervious
surface to native vegetation. No
“net new” definition in SWDM.
7 Remove existing
restroom including
foundation and
restore with native
vegetation.
-310 0 Reverted from impervious
surface to native vegetation. No
“net new” definition in SWDM.
8 Replace existing
asphalt pathway.
Replaced Non-
Pollution
Generating
Impervious
Surface
785 785
9 Install 40 LF of root
barrier.
N/A 0 0 No impervious surface footprint
at grade.
10 Install 20 LF of root
barrier.
N/A 0 0 No impervious surface footprint
at grade.
Net Total
(sf)
Adjust Total
(sf)
Total Replaced
Non-Pollution
Generating
Impervious
Surface (sf)
2,400 3,315
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Soils
Figure 4A shows mapped soil types for the project area and the downstream analysis from the
Natural Resources Conservation Service Web Soil Survey. The mapped project site soils were
categorized as Norma sandy loam and Everett very gravelly, sandy loam, 0-8 percent slopes. The
downstream analysis soils were categorized as predominantly Alderwood gravelly loam, Arents,
Alderwood material, and Everett gravelly loam.
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FIGURE 4A: DOWNSTREAM ANALYSIS SOIL MAP
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SECTION II: CONDITIONS AND REQUIREMENTS SUMMARY
This section will address the requirements set forth by the City of Renton’s 2022 Surface Water
Management Design Manual (SWDM) Core and Special Requirements listed in Chapter 1.
Core Requirements
1. Discharge at the natural location (1.2.1): All onsite and offsite flow patterns will remain
unchanged. All surface water will be discharge at the existing natural discharge locations.
2. Offsite Analysis (1.2.2): The project does not change the rate, volume, duration, or location
of discharges to and from the project site and does not trigger Core Requirements #3 and #8.
Therefore, it meets the requirements of Exemption #3.
3. Flow Control (1.2.3): The project results in less than 5,000 square feet of new plus replaced
and impervious surface and less than ¾ acres new pervious surface. Therefore, it meets the
Basic Exemption from Core Requirement #3.
4. Conveyance System (1.2.4): This project includes a flow dispersal trench outfall and will
meet the design requirements per the SWDM. Design and analysis addressed in Section V.
5. Erosion and Sedimentation Control Plan (1.2.5): The project will require erosion and
sediment controls related to the specific conditions on the site. This is discussed in
Section VIII and on the project plans.
6. Maintenance and Operations (1.2.6): Section X of this report.
7. Financial Guarantees and Liability (1.2.7): Not applicable for King County Department of
Natural Resources Parks projects.
8. Water Quality (1.2.8): The project results in less than 5,000 square feet of new plus
replaced and PGIS and less than ¾ acres new PGPS. Therefore, it meets the Surface Area
Exemption from Core Requirement #8.
9. On-Site BMPs (1.2.9): Section IV of this report.
Special Requirements
1. Other Adopted Area-Specific Requirements (1.3.1):
There are no other Adopted Requirements for the project area.
2. Flood Hazard Area Delineation (1.3.2):
This project is partially within the 100-year floodplain.
3. Flood Protection Facilities (1.3.3): The proposed project does not rely on, modify, or
construct flood protection facilities.
4. Source Control (1.3.4): The site is not a commercial site, and this project does not require
a commercial development permit; therefore, source control is not applicable.
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5. Oil Control (1.3.5): Oil control is not applicable to this project. This project does not meet
the definition of a ‘high use’ site.
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SECTION III: OFFSITE ANALYSIS
This section identifies the tributary basin areas upstream and downstream of the project site and
evaluates upstream and downstream drainage system problems. The intent of this section is to
demonstrate that the proposed project will neither aggravate existing problems nor create new
drainage problems.
The project does not change the rate, volume, duration, or location of discharges to and from the
project site and does not trigger Core Requirements #3 and #8. Therefore, it meets the
requirements of Exemption #3.
A Level 1 Analysis was conducted for the project and is summarized below.
Task 1: Study Area
The study area was mapped to include a quarter mile downstream of the project site. See Figure
3A above for the downstream drainage map.
Task 2: Resource Review
The following documents were reviewed for the purpose of providing the project design team
background information of the site.
• King County Stormwater Services Drainage Complaint database. Accessed via William
Guardia, WLRD Functional Analyst 1, 04/26/2023.
Task 3: Field Inspection
A field visit was conducted to verify the onsite conditions described in this report.
Task 4: Drainage System Description and Problem Descriptions
Drainage System Description
The drainage from the play area is collected in the underdrain system that runs from north to
south within the play area. Water from the perforated pipe is conveyed west through a 6” pipe
where it daylights and outfalls into the existing wetland. Any drainage not collected in the park
conveyance system sheet flows west until it enters Big Soos Creek adjacent to the park. See
Figure 3A above for the downstream drainage map.
Existing Drainage Problem Analysis
One drainage complaint relevant to this project involved observed beaver activity and is shown
in Table 3 (Drainage Complaint No. 2018-0982). A discussion between King County and the
Washington Department of Fish and Wildlife (WDFW) concluded several courses of action that
King County Parks will take to mitigate existing and future problems pertaining to beavers.
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TABLE 3: DRAINAGE COMPLAINTS REVIEWED
Drainage
Complaint No.
Issue Follow Up on the Issue
2015-0732 The contractor for a sewer construction
project for Soos Creek Water & Sewer
District, dumped approximately 50-60
yards of waste material into the wetland
on the site, along the north side of SE
192nd St.
The King County Water and Land
Resources Division told the
contractor to clean up the material
immediately. After talking to the
contractor, DOE was called to set
up an ERTS. The US Army Corps
of Engineers and King County
Utility Inspectors were also
notified of the issue.
2018-0982 Rising water level at Boulevard Lane
Park due to beaver activity. King County comes to an
agreement with the WDFW that
King County Parks will trap
beavers, notch beaver dams, and
apply for an HPA.
Task 5: Mitigation of Existing or Potential Problems
This project is not expected to exacerbate any existing drainage or water quality issues.
Additionally, this project is not expected to concentrate runoff or have offsite impacts on stream
conveyance.
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SECTION IV: FLOW CONTROL, LOW IMPACT
DEVELOPMENT (LID) AND WATER QUALITY FACILITY
ANALYSIS AND DESIGN
Flow Control (Core Requirement #3)
The project meets the criteria for the basic exemption from Core Requirement #3 per section
1.2.3 of the SWDM. The project will create less than 5,000 square feet of new plus replaced
impervious surface and less than ¾ acres of new pervious surface.
Water Quality (Core Requirement #8)
The project meets the criteria for the Surface Area Exemption from Core Requirement #8 per the
SWDM. The project will create less than 5,000 square feet of new plus replaced impervious
surface and less than ¾ acres of new pervious surface.
On-Site BMPs (Core Requirement #9)
The intent of this section is to provide mitigation of hydrologic impacts that are not practical to
mitigate with a flow control facility.
On-site BMPs are implemented to the maximum extent feasible in accordance with Section
1.2.9.2.2 “Large Lot BMP Requirements”. Table 4 shows the list of BMPs that are required to be
evaluated for the project. The project manage runoff from target surfaces through a combination
of full and basic dispersion. For full dispersion, the City of Renton has expressed an allowance to
deviate from the design requirements of the SWDM by allowing a gravel filled trench within a
sensitive area buffer.
The play area will route runoff from 2,450 square feet to a 22-foot-long gravel-filled infiltration
trench per the standard detail in the SWDM. The gravel-filled infiltration trench will spread
runoff towards the west into a native vegetated buffer.
The replaced walkway and bench pads will sheet flow runoff from 865 square feet to adjacent
vegetated areas. This basic dispersion BMP will be designed per the standard detail of the
SWDM.
Figure 5 shows the on-site BMPs used for this project.
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TABLE 4: FLOW CONTROL BMP FEASIBILITY
Requirement Reference Comment
Full Dispersion SWDM 1.2.9.2.2.1 Implemented to the maximum extent feasible.
Note that the City of Renton will allow a
dispersal device within a sensitive area buffer.
2,450 SF will be served by full dispersion.
Full Infiltration of
Roof Runoff
SWDM 1.2.9.2.2.2 Not applicable to this project.
Full Infiltration SWDM 1.2.9.2.2.3 Not allowed in critical area buffers per
CRSWDM Appendix C 2.2.2.5.
Limited Infiltration SWDM 1.2.9.2.2.3 The same requirements for full infiltration apply
to limited infiltration per CRSWDM Appendix
C 2.3.2
Bioretention SWDM 1.2.9.2.2.3 Not allowed in critical area buffers per
CRSWDM Appendix C 2.6.1.25.
Permeable Pavement SWDM 1.2.9.2.2.3 Replacing impervious surface over mapped till
per CRSWDM Appendix C 2.2.7.26.
Parks Operations not resourced to maintain
permeable pavement, which could cause a
slippery surface during wet conditions.
Basic Dispersion SWDM 1.2.9.2.2.4 865 SF will be served by sheet flow basic
dispersion. This includes 785 SF of replaced
walkway and the 75 SF of replaced impervious
surface for the removed restroom/walkway and
relocated to create the bench pads.
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FIGURE 5: ON-SITE BMP DESIGN
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SECTION V: CONVEYANCE SYSTEM ANALYSIS AND DESIGN
This project will install a flow dispersal trench to meet Core Requirement #9 and will be
constructed per Figure 4.2.2.B in the SWDM.
SECTION VI: SPECIAL REPORTS AND STUDIES
A list of special reports and studies used in this TIR are listed below.
• Critical Areas Report and Mitigation Plan: Boulevard Lane Park Play Area Rehabilitation
and Restroom Demolition Project (2023, Lindsey Miller)
• Boulevard Lane Park Select Tree Assessment (2023, Tom Early)
SECTION VII: OTHER PERMITS
A list of anticipated permits and approvals are shown below.
State
• No required permits or approvals.
Local
• City of Renton
o Demolition Permit
▪ Critical Areas Exemptions Required
o Land Use Permit Master Application
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SECTION VIII: CONSTRUCTION STORMWATER POLLUTION
PREVENTION PLAN (CSWPPP) ANALYSIS AND DESIGN
Erosion and Sediment Control Analysis and Design (Part A)
The intent of the Erosion and Sedimentation Control (ESC) Plan is to minimize, to the maximum
extent possible, the transport of sediment from the project site to downstream receiving waters.
The project proposes to implement all appropriate and necessary measures to minimize the
extent and duration of erosion and sediment transport. ESC measures implemented by the
Contractor will be inspected and monitored to ensure continued performance of their intended
function. Facilities and measures shall be maintained and repaired as needed.
Erosion and sediment control measures were chosen to fit the proposed condition and
topography of the site and are subject to modifications in order to minimize sedimentation.
Erosion and Sediment Control Standard Measures
The following measures were selected to fit the site conditions. Selection was based on meeting
the criteria set forth in the 2022 City of Renton Surface Water Design Manual, Appendix D
(Erosion and Sediment Control Standards). During construction, ESC plans will be revised as
necessary to address changing site conditions so as to maintain the minimal extent and duration
of erosion and sediment transport.
1. Clearing Limits: Prior to any land-disturbing activities, including clearing or grading, all
clearing limits, sensitive areas and their buffers, and trees that are to be preserved within the
construction area will be clearly marked with the use of plastic, metal, or stake wire fencing.
2. Cover Measures: Temporary and permanent cover measures will be used to protect
disturbed areas that are to remain unworked for more than 7 days during the dry season and
12 hours during the wet season. The use of mulch and plastic will be extensive in that they
are temporary protective devices where the intent is to minimize the extent and duration of
such areas exposed. Cleared areas will be revegetated as soon as practical after grading.
3. Perimeter Protection: The project will install wattles and/or other types of perimeter
protection measures around the site so as to minimize, to the maximum extent possible, the
transport of sediment from the project site downstream to the Molasses Creek.
4. Traffic Area Stabilization: Entrance to the construction site is surfaced.
5. Sediment Retention: Straw wattles will be used as necessary to capture and control
sediment.
6. Surface Water Controls: Site topography, timing (dry season), and existing infrastructure
are such that cover measures are expected to be adequate to prevent surface water from
contacting disturbed areas and being discharged downstream.
7. Wet Season Requirements: Temporary and permanent cover measures will be used to
protect disturbed areas that are to remain un-worked for more than 12 hours during the wet
season. The wet season is from October 1 to April 30.
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8. Critical Areas Restrictions: Critical areas, their buffers, and trees that are to be preserved
within the construction area will be delineated and clearly marked with the use of plastic,
metal, or stake wire fencing.
9. Dust Control: Water is to be used if a traffic hazard may be created by dust or when wind-
transported sediment is likely to be deposited into the receiving water. Care will be taken to
ensure that runoff will not be generated.
Stormwater Pollution Prevention and Spill Plan Design (Part B)
The intent of the Stormwater Pollution Prevention and Spill (SWPPS) Plan is to identify, to the
maximum extent possible, activities that could contribute pollutants to surface and storm water,
and any adjacent properties during construction. The project proposes to implement all
appropriate and necessary measures to minimize the potential of pollutants to surface and
stormwater. SWPPS Plan measures will be monitored to ensure continued performance of their
intended function. Activities measured shall be maintained and revised as needed to address
changing site conditions.
Stormwater Pollution Prevention and Spill Activity Measures
The following activities are typically associated with construction and are addressed to the
maximum extent possible herein. The contractor will be required to develop a more in-depth
SWPPS that is specific to his/her construction method or procedures and equipment. During
construction, SWPPS plans will be revised as necessary to address changing site conditions so as
to maintain the minimal contribution of pollutants.
1. Storage and Handling of Liquids: The Contractor is responsible to identify liquids on site
and how the liquids will store and handled on the site.
2. Storage and Stockpiling of Construction Materials and Wastes: The Contractor will
identify construction materials stockpiled and wastes that may be generated on-site. This
will include the type of cover measure used to keep rainwater from contacting the materials
and wastes.
3. Fueling: Fueling is to occur away from critical areas. The Contractor will specify method of
onsite fueling and provide a description of containment methods for fuel spills.
4. Maintenance, Repairs, and Storage of Vehicles and Equipment: It is not anticipated that
the Contractor will have a maintenance and repair area. In any event of equipment failure
that raises the potential of pollutant contamination, methods for containment will be
employed.
5. Concrete Saw Cutting, Slurry, and Washwater Disposal: No truck washouts will be
located in Critical Areas or in other delineated and marked prohibited areas.
6. Application of Chemicals, including Pesticides and Fertilizers: The Contractor will
provide a list of the materials, how the materials will be stored, handled and applied on the
site. Pesticides and fertilizers are not planned for this project.
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SECTION IX: BOND, QUANTITIES, FACILITY SUMMARIES ,
AND DECLARATION OF COVENANT
This is not applicable. King County will be responsible for maintenance and operation of this
facility.
SECTION X: OPERATIONS AND MAINTENANCE MANUAL
The park is maintained by King County Parks. King County Parks will follow the maintenance
requirements listed in Appendix A of the 2022 City of Renton Surface Water Design Manual for
the No.27 – Gravel Filled Dispersion Trench BMP and No.34 – Sheet Flow BMP:
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