HomeMy WebLinkAboutEx_08_TIR Boeing Renton
Apron R Crew Shelters
and Tool Cabanas
Technical
Information Report
Prepared for:
The Boeing Company
P.O. Box 3707
Puyallup, WA 98373
Project Manager: Joe Nguyen
Phone: (425) 328-4599
Permitting Contact: Mark Clement
Phone: (425) 229-4279
Prepared by:
Sitts & Hill Engineers, Inc.
4815 Center Street
Tacoma, Washington 98409
Contact: Don Davis, P.E.
Phone: (253) 474-9449
February 2025
S&H Job Number 20,727
Exhibit 8
Docusign Envelope ID: 6BFD5F36-E5AA-4F5D-9CAD-4567CCEC6B34
Boeing Renton
Apron R Crew Shelters and Tool Cabanas
Technical Information Report
Prepared for:
The Boeing Company
P.O. Box 3707
Puyallup, WA 98373
Project Manager: Joe Nguyen
Phone: (425) 328-4599
Permitting Contact: Mark Clement
Phone: (425) 229-4279
Prepared by:
Sitts & Hill Engineers, Inc.
4815 Center Street
Tacoma, Washington 98409
Contact: Don Davis, P.E.
Phone: (253) 474-9449
IN COMPLIANCE WITH CITY OF RENTON
STANDARDS
February, 2025 S&H Job Number 20,727
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TABLE OF CONTENTS
1.0 PROJECT OVERVIEW ............................................................................................................... 3
1.1 Scope ................................................................................................................................................................ 3
1.2 Existing Conditions ........................................................................................................................................ 4
1.3 Proposed Conditions ..................................................................................................................................... 5
2.0 Conditions and Requirements Summary ............................................................................... 6
2.1 Discussion of Core and Special Requirements .......................................................................................... 6
2.1.1 Core Requirement #1: Discharge at the Natural Location ................................................................ 6
2.1.2 Core Requirement #2: Off-site Analysis .............................................................................................. 6
2.1.3 Core Requirement #3: Flow Control ..................................................................................................... 6
2.1.4 Core Requirement #4: Conveyance System ....................................................................................... 6
2.1.5 Core Requirement #5: Construction Stormwater Pollution Prevention ........................................... 6
2.1.6 Core Requirement #6: Maintenance and Operations ........................................................................ 6
2.1.7 Core Requirement #7: Financial Guarantees and Liability ............................................................... 7
2.1.8 Core Requirement #8: Water Quality ................................................................................................... 7
2.1.9 Core Requirement #9: On-site BMPs ................................................................................................... 7
2.1.10 Special Requirement #1: Other Adopted Area-Specific Requirements ........................................ 8
2.1.11 Special Requirement #2: Flood Hazard Area Delineation .............................................................. 8
2.1.12 Special Requirement #3: Flood Protection Facilities ....................................................................... 8
2.1.13 Special Requirement #4: Source Control .......................................................................................... 8
2.1.14 Special Requirement #5: Oil Control .................................................................................................. 9
2.1.15 Special Requirement #6: Aquifer Protection Areas ......................................................................... 9
3.0 OFF-SITE ANALYSIS ............................................................................................................... 12
4.0 FLOW CONTROL, LID, AND WATER QUALITY FACILITY ANALYSIS AND DESIGN ..... 13
5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN ............................................................. 14
6.0 SPECIAL REPORTS AND STUDIES ...................................................................................... 15
7.0 OTHER PERMITS ..................................................................................................................... 16
8.0 CSWPPP ANALYSIS AND DESIGN ....................................................................................... 17
9.0 BOND QUANTITIES and R/D FACILITY SUMMARIES ........................................................ 18
9.1 Bond Quantities ........................................................................................................................................... 18
9.2 Facility Summaries ....................................................................................................................................... 18
10.0 OPERATIONS AND MAINTENANCE MANUAL .................................................................. 19
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TABLE OF APPENDICES
A.1 TIR Worksheet ........................................................................................................................ 20
A.2 Existing and Proposed Surface Coverage Exhibits .......................................................... 27
A.3 Site Historical Aerial Photography ...................................................................................... 31
A.4 Stormwater Engineering Calculations ................................................................................ 35
A.5 Geotechnical Engineering Report........................................................................................ 36
TABLE OF FIGURES
Figure 1 – Site Location Map ........................................................................................................................... 4
Figure 2 – Drainage Review Flow Chart ...................................................................................................... 10
Figure 3 – FEMA Map – Proposed Building ................................................................................................ 11
Figure 4- City of Renton Flow Control Application Map ............................................................................ 13
Figure 5 – TIR Worksheet ............................................................................................................................. 26
TABLE OF TABLES
Table 1. Existing and Developed Condition Description ............................................................................. 5
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1.0 PROJECT OVERVIEW
1.1 Scope
This Technical Information Report (TIR) addresses improvements associated with the
installation of crew shelters, tool cabanas, and associated utility improvements at the Boeing
Renton facility, located at 737 Logan Ave N, Renton, WA (Parcel No. 0723059001). Please see
Figure 1 for the Site Location Map of the proposed crew shelters. The crew shelters and tool
cabanas are premade structures installed on-site, over existing concrete pavement, providing
office and storage space in close proximity to aircraft being serviced or prepared for delivery.
Power and communication utilities will be delivered to the new facilities via new conduits
routed above existing paved surfaces. No earthwork, paving, utility, or other site improvements
are proposed for this project.
This Technical Information Report has been prepared in accordance with the 2022 City of
Renton Stormwater Design Manual (SWDM).
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Figure 1 – Site Location Map
1.2 Existing Conditions
The subject sites are located on one parcel, zoned as Urban Center-2 (UC-2), with an area of
153.28 acres that is fully developed. The sites, as depicted on the topographical survey and
utility plans, are relatively flat. Current surfacing on-site is concrete pavement.
The existing site consists of airplane parking and maintenance stalls, as well as supporting
buildings such as hangars, offices, and warehouses. Based on historical photographs and the
King County Assessor’s Website, the site has been developed since 1942. See Appendix A.3,
which includes a series of aerial photographs dating back to July, 1990.
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1.3 Proposed Conditions
The purpose of this project is to install crew shelters at existing airplane parking stalls. Tool
cabanas will be installed near the crew shelters. Each shelter will have access stairs and an ADA
compliant access ramp. This project proposes no grading, paving, or drainage (water quality,
detention, or conveyance) improvements for on-site and off-site areas. See Table 1 for a
description of existing and proposed surface conditions of the proposed building.
All of the stormwater generated on-site as part of this project will come from non-pollution
generating roofing. All runoff from these roofs will follow pre-construction flow paths.
Please see Appendix A.2 for Existing and Proposed Surface Coverage Exhibits.
Table 1. Existing and Developed Condition Description
Description On-site Off-site Total
Existing Conditions
Total Project Area (ft2) 2,592 0 2,592
Existing impervious surface (ft2) 2,592 0 2,592
Existing landscaping/lawn area (ft2) 0 0 0
Total Project Area (ft2) 2,592 0 2,592
New impervious surface (ft2) 0 0 0
New pollution generating impervious surface (PGHS) (ft2) 0 0 0
Replaced impervious surface (ft2) 2,592 0 2,592
Replaced PGHS (ft2) 0 0 0
New plus replaced impervious surface (ft2) 2,592 0 2,592
New plus replaced PGHS (ft2) 0 0 0
Existing impervious surfaces converted to
vegetation/landscaping (ft2)
0 0 0
Land Disturbed (ft2) 2,592 0 2,592
Native Vegetation to Pasture (acres) 0 0 0
Existing vegetation area to remain (ft2) 0 0 0
Existing impervious surface to remain unaltered (ft2) 0 0 0
Value of proposed improvements ($) TBD 0 TBD
Amount to be Graded/Approx. (CY) 0 0 0
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2.0 CONDITIONS AND REQUIREMENTS SUMMARY
2.1 Discussion of Core and Special Requirements
This is a project in Urban Center zoning that replaces a total of more than 2,000 square feet of
impervious surface. Therefore, the project is subject to a full drainage review and must satisfy
all core requirements (1-9) and all special requirements (1-6) of the 2022 City of Renton Surface
Water Design Manual (SWDM). See Figure 2 at the end of this Section for the Drainage Review
Flow Chart for the proposed crew shelters. Below is a description of each core requirement and
how the project proposes to satisfy each requirement.
2.1.1 Core Requirement #1: Discharge at the Natural Location
This requirement will be met by maintaining preconstruction flow paths.
2.1.2 Core Requirement #2: Off-site Analysis
This project does not trigger Core Requirements #3 or #8. Additionally, this project does not
include more than 2,000 square feet of new impervious surface, more than ¾ acre of new
pervious surface, or modifications to existing drainage facilities, and does not include work in
landslide, steep slope, or erosion hazard areas. Therefore, this project is exempt from Core
Requirement #2.
2.1.3 Core Requirement #3: Flow Control
The project proposes work within the Peak Rate Flow Control Standards (Existing Site
Conditions) Area. Projects in that area must match the developed peak discharge rates to the
existing site conditions peak discharge rates for the 2-, 10-, and 100-year return periods.
However, this project is proposing less than 5,000 square feet of new plus replaced impervious
surface and less than ¾ acres of new pervious surface and is therefore exempt from Core
Requirement #3.
2.1.4 Core Requirement #4: Conveyance System
This project proposes no new conveyance systems or modifications to existing conveyance
systems.
2.1.5 Core Requirement #5: Construction Stormwater Pollution Prevention
No activities related to this project are expected to create sediment or other stormwater
pollutants, therefore a Temporary Erosion and Control (TESC) Plan will not be included in the
construction plan set. A CSWPPP under a separate cover has been prepared to satisfy this
requirement.
2.1.6 Core Requirement #6: Maintenance and Operations
This project does not propose installation of new stormwater features, or modification of
existing stormwater features. Therefore, no Operations and Maintenance Manual has been
prepared.
Boeing will continue to be responsible for maintenance and operation of the existing on-site
stormwater facilities.
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2.1.7 Core Requirement #7: Financial Guarantees and Liability
We do not anticipate that Boeing will be required to provide a Construction Bond to the City of
Renton prior to issuance of the permit. The contractor/owner will be responsible for all erosion
and maintenance liabilities during construction.
2.1.8 Core Requirement #8: Water Quality
This project is proposing less than 5,000 square feet of new plus replaced PGIS and less than ¾
acres of new PGPS and is therefore exempt from Core Requirement #8.
2.1.9 Core Requirement #9: On-site BMPs
Target surfaces subject to Core Requirement #9 On-site BMPs include replaced impervious
surfaces, already mitigated with an approved on-site BMP. This site qualifies for the Large Lot
BMP Requirements per 1.2.9.2.2 of the City of Renton SWDM, since it is larger than 22,000
square feet. These requirements state that all proposed pervious surfaces must implement the
soil amendment BMP and roof downspout connections must be perforated pipe connections.
Neither soil amendment nor downspout BMPs apply to the project as construction will occur
above existing concrete pavement. Construction will also not involve removal or replacement
of any existing concrete pavement.
In addition, these requirements require the consideration of the following BMPs: full
dispersion, full infiltration, limited infiltration, bioretention, permeable pavement, basic
dispersion, reduced impervious surface credit, native growth retention credit, tree retention
credit. None of the listed BMPs are feasible for implementation on the project site, and will
therefore not be implemented. The remainder of this section contains a discussion of
infeasibility for each BMP.
Full Dispersion – The application of this BMP depends on the sheet flow of runoff through an
area of native vegetation. The project site does not contain any native vegetation area (e.g.,
forested) in the existing or proposed condition. Therefore, full dispersion is infeasible for this
project.
Full Infiltration – Per Section C.2.2.2 of the Manual, full infiltration requires that “Existing soils
must be coarse sands or cobbles or medium sands and cannot be comprised of fill materials
where the infiltration device will be located.” Site soils meet this requirement, except for the
top layer of soil. However, the shallow groundwater level renders infiltration on-site infeasible.
Therefore, full infiltration is infeasible for this project.
Limited Infiltration – The infeasibility criteria for limited infiltration are the same as those for
full infiltration except that appropriate soils may be fine sands, loamy sands, sandy loams, or
loams. Note that Section C.2.3.2 of the Manual states “Silt and clay loams, and cemented till
(hardpan) are not suitable for limited infiltration systems.” Site soils meet this requirement,
except for the top layer of soil. However, the shallow groundwater level renders infiltration on-
site infeasible. Therefore, limited infiltration is infeasible for this project.
Bioretention – This project is underlain by soil that makes infiltration impractical, as such a
bioretention facility is infeasible.
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Permeable Pavement – The soil under a permeable pavement section must provide adequate
treatment for groundwater protection. The underlying soils should also infiltrate for this
surfacing to be durable and effective. The requirements for adequate treatment are a minimum
organic content of 1.0% and a minimum cation exchange capacity of 8 milliequivalents per 100
grams. The uppermost soil layer on the project site is made up of fill material and does not meet
these requirements. Again, the depth to groundwater renders BMPs that rely on infiltration
ineffective. Permeable Pavement is infeasible for this project.
Basic Dispersion – The implementation of basic dispersion requires the dispersed stormwater to
flow over a vegetated surface, but there are no existing or proposed vegetated surfaces near
the proposed development. Such a flowpath cannot be provided on the project site without a
drastic reconfiguration of the site and Foreign Object Debris (FOD) risk to aircraft. We see basic
dispersion as infeasible to the project.
Reduced Impervious Surface Credit – This BMP presents four possible methods of impervious
surface reduction: restricted footprint, wheel strip driveways, minimum disturbance
foundation, and open grid decking over pervious surface. The restricted footprint method
requires less than 10,000 square feet of impervious area, which is not feasible for the proposed
use of the site as airplane maintenance facilities. A wheel strip driveway is not applicable for
airplane parking. A minimum disturbance foundation is not feasible for an automotive
workshop. Open grid decking over a pervious surface is also not applicable to airplane parking
or a structure. The reduced impervious surface credit is infeasible for this project.
Native Growth Retention Credit – The existing condition of the site does not contain any native
growth. Therefore, the native growth retention credit is infeasible for this project.
Tree Retention Credit – The existing condition of the site contains no trees.
2.1.10 Special Requirement #1: Other Adopted Area-Specific Requirements
N/A. The project site is not in a designated critical drainage area or in an area included in an
adopted master drainage plan, basin plan, salmon conservation plan, stormwater compliance
plan, flood hazard management plan, lake management plan, or shared facility drainage plan.
2.1.11 Special Requirement #2: Flood Hazard Area Delineation
N/A. Per the FEMA floodplain map at the end of this Section, Figure 3, the project site lies within
a boundary delineating “areas determined to have a 0.2% annual chance of flooding.” This is
outside of the 100-year flood boundary and therefore flood-related delineation on the project
site is not required.
2.1.12 Special Requirement #3: Flood Protection Facilities
N/A. This project does not propose to rely on an existing flood protection facility nor does it
modify or construct a new flood protection facility.
2.1.13 Special Requirement #4: Source Control
Boeing shall continue to maintain current source control features.
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2.1.14 Special Requirement #5: Oil Control
This project proposes development on an existing high-use site. Runoff from the project site is
treated by an existing oil/water separator.
2.1.15 Special Requirement #6: Aquifer Protection Areas
This project is not located within an Aquifer Protection Area per King County GIS.
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Figure 2 – Drainage Review Flow Chart
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Figure 3 – FEMA Map – Proposed Building
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3.0 OFF-SITE ANALYSIS
Per City of Renton SWDM Section 1.2.2, this project is exempt from providing an off-site
analysis report that assesses potential off-site drainage and water quality impacts associated
with the redevelopment of the project site.
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4.0 FLOW CONTROL, LID, AND WATER QUALITY FACILITY ANALYSIS AND
DESIGN
No stormwater features were designed or analyzed as part of this project.
Figure 4- City of Renton Flow Control Application Map
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5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN
This project proposes no changes to the existing on-site private stormwater system. Therefore,
no stormwater calculations have been performed as part of this project.
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6.0 SPECIAL REPORTS AND STUDIES
We are not aware of any site characteristics that are particularly sensitive to stormwater runoff.
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7.0 OTHER PERMITS
We anticipate that a Land Use Master Application, Building Permit, Shoreline Protection
Permit, and a Joint Aquatic Resources Permit Application (JARPA) will be required.
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8.0 CSWPPP ANALYSIS AND DESIGN
The Construction Stormwater Pollution Prevention Plan report is included under a separate
cover.
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9.0 BOND QUANTITIES AND R/D FACILITY SUMMARIES
9.1 Bond Quantities
A Bond Quantity Worksheet has not been prepared for this project as it does not include the
construction of drainage facilities, or other facilities that would impact the City of Renton and
the surrounding environment if left unfinished.
9.2 Facility Summaries
This project proposes to implement no stormwater facilities, or modifications to stormwater
facilities.
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10.0 OPERATIONS AND MAINTENANCE MANUAL
An Operations and Maintenance Manual has not been prepared for this project.
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A.1 TIR Worksheet
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Figure 5 – TIR Worksheet
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A.2 Existing and Proposed Surface Coverage Exhibits
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A.3 Site Historical Aerial Photography
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A.4 Stormwater Engineering Calculations
Stormwater calculations were not prepared for this project as it does not trigger flow control
or water quality requirements.
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A.5 Geotechnical Engineering Report
A Geotechnical Report was not prepared for this project.
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