DevSvcs-THP-2019.January
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Public Works Department
SIMPLIFIED TIR
SUBMITTAL TEMPLATE
Project Name:
Date of Submittal:
Prepared By:
PE License #:
City of Kirkland Permit #:
PE stamp (if required per Appendix C.1.1):
Click to upload stamp image
For office use:
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SIMPLIFIED TECHNICAL INFORMATION REPORT (TIR)
Purpose…………………………………………………………………………………………… 3
Disclaimer………………………………………………………………………………………… 3
Project Information…………………………………………………………………………… 3
Simplified Drainage Plan Eligibility……………………………………………………… 4
Narrative Description………………………………………………………………………… 5
Soils report/special studies results……………………………………………………… 6
Flow control BMP site plan………………………………………………………………… 7
Flow control BMP design & maintenance details…………………………………… 8
o Full Dispersion………………………………………………………………………………… 9
o Full Infiltration………………………………………………………………………………… 10
o Limited Infiltration…………………………………………………………………………… 11
o Bioretention…………………………………………………………………………………… 12
o Permeable Pavement……………………………………………………………………… 13
o Basic Dispersion……………………………………………………………………………… 14
CSWPP plan……………………………………………………………………………………… 15
o Erosion Sediment Control (ESC) Measures………………………………………… 17
A. Mark Clearing Limits/Minimize Clearing…………………………………… 17
B. Minimize Sediment Tracked Offsite………………………………………… 18
C. Control Sediment………………………………………………………………… 19
D. Stabilize Exposed Soils………………………………………………………… 20
E. Control Runoff……………………………………………………………………… 21
F. Control Dewatering……………………………………………………………… 23
G. Control Other Pollutants………………………………………………………… 24
H. Final Stabiliziation………………………………………………………………… 25
o Stormwater Pollution Prevention and Spill (SWPPS) Measures……………… 26
1. Effective Pollutant Handling & Disposal Procedures………………… 26
2. Cover and Containment for Pollutants……………………………………… 26
3. Maintenance /Repair of Heavy Equipment and Vehicles.…………… 27
4. Fertilizer /Pesticides Application……………………………………………… 27
5. pH Modification of Runoff…………………………………………………...... 28
6. Permanent Structures and Features….....………………………………… 28
Appendix A – Geotechnical Report
Appendix B – WWHM 2012 Report
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PURPOSE AND INSTRUCTIONS FOR USE
This Simplified TIR template is based on the requirements of Appendix C of the 2016 King
County Storm Water Design Manual (KCSWDM) and City of Kirkland's Addendum to the
KCSWDM (Policy D-10), together known as "The Manual". Permit applicants are required to
complete and submit the Simplified TIR for all simplified drainage review projects proposed
within the City of Kirkland. Instructions for use are given throughout the document in italics. All
page numbers reference the manual, unless otherwise specified.
DISCLAIMER
It is the responsibility of the applicant to ensure that all applicable codes and regulations have
been addressed. Use of this template does not relieve the applicant of meeting all of the
project's legal obligations, even if they are related to erosion sediment control and stormwater
pollution prevention and do not appear in the template. Any conflicts between this document
and 2016 KCSWDM shall defer to the manual.
PROJECT INFORMATION
Applicant contact
Project
Stormwater values
Phone number:
Site address:
Name:
Phone number:
Site address:
Name:
Total project size (sf):
Existing impervious (sf):
Percentage impervious on site (%):
New impervious (sf):
Replaced impervious (sf):
Total proposed impervious (sf):
New pervious (sf):
New PGIS (sf):
New PGPS (acres):
Predominant soil type (Till or Outwash?):
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SIMPLIFIED DRAINAGE PLAN ELIGIBILITY
Before submittal, review the following flow chart to confirm that the project is eligible for
simplified drainage review.
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NARRATIVE DESCRIPTION
Include a written description of project in the space below. See C.4.4.1 (p. C-144) for an example.
For office use: Note any post-revision or field changes in the space below.
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SOILS REPORT/SPECIAL STUDIES RESULTS
Include a full geotechnical report prepared by or under the direction of a licensed onsite
sewage system designer or geotechnical professional with your submittal. The report must
meet the requirements of COK Policy D-8: Soil Information for Stormwater Development to
Meet Flow Control BMP Requirements. Copy and paste the main recommendations regarding
LID BMP feasibility in the space below.
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FLOW CONTROL BMP SITE PLAN
Paste the flow control BMP site plan drawing in the space below (does not need to be to scale).
The plan must show all target impervious surfaces, new pervious surfaces and required flow
control BMPs proposed for the project site. Refer to City of Kirkland Policy G-7 for required plan
elements. See Figure C.4.2.A (p. C-141) for an example site plan.
Click to upload image
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Full Dispersion
Full Infiltration
Bioretention
Limited Infiltration
Basic Dispersion
Permeable Pavement
FLOW CONTROL BMP DESIGN
This section provides descriptions of approved BMPs based on Section C.2 (p. C-31). Use the
following pages of this section to provide design specifications and maintenance instructions for
each flow control BMP proposed. Indicate in the checkbox lists if a BMP will not be used. Refer to
Section C.2 (p. C-31) for guidance.
This project will: apply flow control BMPs as specified in the following section; OR
demonstrate compliance with the LID Performance Standard of KCSWDM Section 1.2.9.
If applying flow control BMPs, indicate which types will be employed from the following checklist:
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FULL DISPERSION (Reference KCSWDM C.2.1, p. C-32 for additional information)
Select the type of Full Dispersion BMP to be applied, or indicate that Full Dispersion will not be
applied.
Check if Full Dispersion will not be applied to this project
Splash Blocks (Section C.2.1.3, p. C-34)
10-foot Gravel Trench (Section C.2.1.5, p. C-35)
Rock Pads (Section C.2.1.4, p. C-35)
Sheet Flow from Impervious Surface (Section C.2.1.6, p. C-37)
50-foot Gravel Trench (Section C.2.1.5, p. C-35)
Sheet Flow from Non-Native Pervious Surface (Section C.2.1.6, p. C-37)
Feasibility
Use the space below to describe how the proposed Full Dispersion BMP meets the minimum
design requirements of C.2.1.1 (p. C-32 & -33) and COK Storm Drainage Pre-approved Plans; OR
explain why it is infeasible or inapplicable to apply full dispersion.
Design
If determined feasible, describe the device(s) used for Full Dispersion and how the relevant design
specifications and native growth retention requirements of C.2.1.2-C.2.1.8 (p. C-34 through C-46)
have been achieved in the space below.
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FULL INFILTRATION (Reference KCSWDM C.2.2, p. C-48 for additional information)
Select the type of Full Infiltration BMP to be applied, or indicate that Full Infiltration will not be
applied.
Check if Full Infiltration will not be applied to this project
Drywells (Section C.2.2.4, p. C-51)
Gravel Filled Trenches (Section C.2.2.3, p. C-50)
Ground Surface Depressions (Section C.2.2.5, p. C-51)
Feasibility
Use the space below to describe how the proposed Full Infiltration BMP meets the minimum
design requirements of C.2.2.2 (p. C-48 through C-50) and COK Storm Drainage Pre-approved
Plans; OR explain why it is infeasible or inapplicable to apply full infiltration.
Design
If determined feasible, describe the device(s) used for Full Infiltration and how the relevant design
specifications of C.2.2.3-C.2.2.5 (p. C-50 through C-56) have been achieved in the space below.
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LIMITED INFILTRATION (Reference KCSWDM C.2.3, p. C-57 for additional information)
Select the type of Limited Infiltration BMP to be applied, or indicate that Limited Infiltration will not
be applied.
Check if Limited Infiltration will not be applied to this project
Drywells (Section C.2.3.4, p. C-58)
Gravel Filled Trenches (Section C.2.3.3, p. C-58)
Feasibility
Use the space below to describe how the proposed Limited Infiltration BMP meets the minimum
design requirements of C.2.3.2 (p. C-57) and COK Storm Drainage Pre-approved Plans; OR explain
why it is infeasible or inapplicable to apply limited infiltration.
Design
If determined feasible, describe the device(s) used for Limited Infiltration and how the relevant
design specifications requirements of C.2.3.3-C.2.3.4 (p. C-57 through C-58) have been achieved
in the space below.
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BIORETENTION (Reference KCSWDM C.2.6, p. C-73 for additional information)
Select the type of Bioretention BMP to be applied, or indicate that Bioretention will not be applied.
Check if Bioretention will not be applied to this project
Bioretention Swales
Bioretention Cells
Bioretention Planters
Feasibility
Use the space below to describe how the proposed Bioretention BMP meets the feasibility
requirements of C.2.6 (p. C-73 through C-76) and COK Storm Drainage Pre-approved Plans; OR
explain why it is infeasible or inapplicable to apply bioretention.
Design
Describe how the relevant design specifications requirements of C.2.6.1-C.2.6.2 (p. C-77 through
C-81) have been achieved in the space below.
Road-side Bioretention Ditch
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PERMEABLE PAVEMENT (Reference KCSWDM C.2.7, p. C-86 for additional information)
Select the type of Permeable Pavement BMP to be applied, or indicate that Permeable Pavement
will not be applied.
Porous Concrete (Section C.2.7.2, p. C-90)
Permeable Pavers (Section C.2.7.4, p. C-91)
Porous Asphaltic Concrete (Section C.2.7.3, p. C-91)
Other permeable pavement BMP per Appendix C, modified by Policy D-10
Feasibility
Use the space below to describe how the proposed permeable pavement BMP meets the minimum
design requirements of C.2.7 and C.2.7.1 (p. C-86 through C-90) and COK Storm Drainage Pre-
approved Plans; OR explain why it is infeasible or inapplicable to apply permeable pavement.
Design
Describe the proposed type of Permeable Pavement and how the relevant design specifications
requirements of C.2.7.2-C.2.7.6 (p. C-90 through C-92) have been achieved in the space below.
Check if Permeable Pavement will not be applied to this project
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BASIC DISPERSION (Reference KCSWDM C.2.4, p. C-60 for additional information)
Select the type of Basic Dispersion BMP to be applied, or indicate that Basic Dispersion will not be
applied.
Check if Basic Dispersion will not be applied to this project
Rock Pads (Section C.2.4.3, p. C-62)
Splash Blocks (Section C.2.4.2, p. C-61)
Gravel Filled Trenches (Section C.2.4.4, p. C-62)
Feasibility
Use the space below to describe how the proposed Basic Dispersion BMP meets the minimum
design requirements of C.2.4.1 (p. C-60 through C-61) and COK Storm Drainage Pre-approved
Plans; OR explain why it is infeasible or inapplicable to apply basic dispersion.
Design
Describe the device(s) used for Basic Dispersion and how the relevant design specifications
requirements of C.2.4.2-C.2.4.5 (p. C-61 through C-69) have been achieved in the space below.
Sheet Flow (Section C.2.4.5, p. C-63)
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SITE CSWPP PLAN
Introduction
The following Simplified Construction Stormwater Pollution Prevention (CSWPP) plan conforms
to Core Requirement #5 from the 2016 King County Stormwater Design Manual and City of
Kirkland Pre-approved Plans regarding erosion and sediment control and pollution prevention.
These rules require the submittal of a CSWPP plan for review and approval by Kirkland staff.
This plan consists of two parts: an Erosion and Sediment Control (ESC) plan and a Stormwater
Pollution Prevention and Spill Control (SWPPS) plan.
The placement and type of proposed ESC and SWPPS measures are shown in the following
section. The contractor or other persons performing construction activities shall comply with
the stormwater pollution prevention and spill control measures/BMPs specified for such
activities in Appendix D, the King County Stormwater Pollution Prevention Manual and/or
Section E of COK Pre-approved plans.
Both the applicant and contractor are responsible for implementation and maintenance of the
approved Simplified site CSWPP plan and any additional measures required by COK.
The Simplified site CSWPP plan shall be retained onsite or within reasonable access to the site.
The plan shall be modified whenever there is a significant change in the design, construction,
operation, or maintenance at the construction site that has, or could have, a significant effect
on the discharge of pollutants to surface waters. The plan shall be modified, if during
inspections or investigations conducted by the City, it is determined that the plan is ineffective
in eliminating or significantly minimizing pollutants in stormwater discharges from the site. The
plan shall be modified as necessary to include additional or modified measures designed to
correct problems identified.
Phone Number:
Address:
Compliance Contact Person:
Email:
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CSWPP PLAN
Paste the CSWPP Plan in the space below. See CK-E.04 for an example.
Click to upload image
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EROSION AND SEDIMENT CONTROL PLAN
A. MARK CLEARING LIMITS/MINIMIZE CLEARING (Reference KCSWDM D.3.2.A,
p. D-126 for additional information)
Prior to beginning land disturbing activities, all clearing limits, sensitive areas and their buffers,
trees that are to be preserved within the construction area and any existing or proposed flow
control BMP areas shall be clearly marked, both in the field and on the small site CSWPP plan,
to prevent damage and offsite impacts. Also, clearing shall be minimized to the maximum
extent practicable. See "Mark Clearing Limits/Minimize Clearing," Section D.3.4.1 (p. D-129),
for more detailed specifications
.
Design & Installation
Use the following space to specify how clearing limits are to be delineated, and instructions
on their installation
.
Maintenance
Use the following space to specify maintenance requirements for the clearing limits measures.
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B. MINIMIZE SEDIMENT TRACKED OFFSITE (Reference KCSWDM D.3.2.B, p. D-126 and
COK pre-approved plans CK-3.01 & .02 for additional information)
1. Establish a stabilized entrance for construction vehicle access to minimize the tracking of
sediment onto public roads. Entrance and exit shall be limited to one route, if possible.
See "Stabilized Construction Entrance," Section D.2.1.4.1 (p. D-42), for detailed
specifications.
2. If sediment is tracked offsite, public roads shall be cleaned thoroughly at the end of each
day, or more frequently during wet weather, if necessary to prevent sediment from
entering waters of the state. Sediment shall be removed from roads by shoveling or pickup
sweeping and shall be transported to a controlled sediment disposal area. Street washing
will be allowed only after sediment is removed in this manner. Street wash wastewater
shall be controlled by pumping back onsite, or otherwise be prevented from discharging
into drainage systems tributary to surface waters. This requirement shall be included as a
note on the small site CSWPP plan
.
Specification
Use the following space to describe how offsite sediment tracking will be minimized
.
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C. CONTROL SEDIMENT (Reference KCSWDM D.3.2.C, p. D-126 for additional
information)
Runoff from disturbed areas must pass through a sediment control measure to prevent the
transport of sediment downstream until the disturbed area is fully stabilized. Sediment controls
must be installed as one of the first steps in grading and shall be functional before other land
disturbing activities take place. One or more the following sediment controls may be used to
meet this requirement
:
Silt Fence (See COK Pre-approved plan CK-E.03)
Triangular Silt Dike (See Section D.2.1.3.4, p. D-37)
Vegetated Strip (See Section D.2.1.3.3, p. D-37)
Storm Drain Inlet Protection (See Section D.2.1.5.3, p. D-53)
Design & Installation
Use the following space to specify the measures to be employed for sediment control
.
Maintenance
Use the following space to specify maintenance requirements for sediment control measures.
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D. STABILIZE EXPOSED SOILS (Reference KCSWDM D.3.2.D, p. D-126 for additional
information)
All exposed and unworked soils shall be stabilized through the application of cover measures to protect the soil from
the erosive forces of raindrop impact, flowing water, and wind erosion. One or more of the following cover
measures may be used to meet this requirement during the construction phase:
Cover measures shall be applied in accordance with the following requirements:
1. Cover measures must be installed if an area is to remain unworked for more than seven days during the dry
season (May 1 to September 30) or for more than two consecutive working days during the wet season
(October 1 to April 30). These time limits may be relaxed if an area poses a low risk of erosion due to soil
type, slope gradient, anticipated weather conditions, or other factors. Conversely, the City may reduce
these time limits if site conditions warrant greater protection (e.g., adjacent to significant aquatic resources
or highly erosive soils) or if significant precipitation is expected.
2. Any area to remain unworked for more than 30 days shall be seeded or sodded unless the City determines
that winter weather makes vegetation establishment infeasible. During the wet season, exposed ground
slopes and stockpile slopes with an incline of 3 horizontal to 1 vertical (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. Also
during the wet season, the material necessary to cover all disturbed areas must be stockpiled on site. The
intent of these cover requirements is to have as much area as possible covered during any period of
precipitation.
Plastic Covering (See COK Pre-approved plan CK-E.05)
Seeding (See Section D.2.1.2.6, p. D-24)
Nets and Blankets (See COK Pre-approved plan CK-E.06)
Sodding (See Section D.2.1.2.7, p. D-28)
Mulching (See Section D.2.1.2.2, p. D-16)
Design & Installation
Use the following space to specify the measures to be employed for stabilization of exposed soils.
Maintenance
Use the following space to specify maintenance requirements for sediment control measures.
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E. CONTROL RUNOFF (Reference KCSWDM D.3.2.E, p. D-127 for additional information)
Stormwater runoff originating on the site and/or entering the site from offsite areas must be controlled so as to
minimize erosion of disturbed areas and exposed cut and fill slopes, and to minimize erosive impacts on existing or
proposed flow control BMP areas. The following runoff control measures shall be used as needed per the conditions
of use and specifications for each measure:
Interceptor Dikes and Swales (see Section D.2.1.6.1, p. D-60 for conditions of use and specifications)
Ditches (see Section D.3.4.2, p. D-129 for conditions of use and specifications)
Check Dams (COK Pre-approved Plan CK-E.07)
Pipe Slope Drain (see Section D.3.4.3, p. D-130 for conditions of use and specifications)
Catch Basin/Inlet Sedimentation Trap (COK Pre-approved Plan CK-E.08)
Storm Drain Protection Insert (COK Pre-approved Plan CK-E.11)
Straw Wattles (COK Pre-approved Plan CK-E.10)
Temporary Sediment Trap (COK Pre-approved Plan CK-E.09A)
Temporary Sediment Pond (COK Pre-approved Plan CK-E.09)
Design & Installation
Use the following space to specify the design and installation of runoff control measures.
Show sizing for temporary sediment pond for both the 2 and 10 year storm events
.
Maintenance
Use the following space to specify maintenance requirements for the runoff control measures.
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Sizing Calculations
In the space below, paste an image of the report from WWHM stating the 2- and 10-year peak
flows
.
In the space below, paste calculations showing the sizing requirements.
Click to upload image
Click to upload image
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F. CONTROL DEWATERING (Reference KCSWDM D.3.2.F, p. D-127 for additional
information)
All surface water from disturbed areas shall be intercepted, conveyed to a sediment pond or
trap, and discharged downslope of any disturbed areas. The purpose of surface water control is
to collect and convey surface water so that erosion is minimized, and runoff from disturbed
areas is treated by a sediment pond or trap
.
Design & Installation
Use the following space to specify the design and installation of dewatering control measures.
If not applicable, include language from geotechnical report stating that no groundwater will
be present on site. Note if there are contaminated soils on site
.
Maintenance
Use the following space to specify maintenance requirements for the dewatering control measures.
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G. CONTROL OTHER POLLUTANTS (Reference KCSWDM D.3.2.G, p. D-127 for additional
information)
The requirements for this section are covered in the Stormwater Pollution Prevention and Spill
(SWPPS) Plan, beginning on p. 27 of this document.
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H. FINAL STABILIZATION (Reference KCSWDM D.3.2.H, p. D-127 for additional
information)
1. Prior to final construction approval, the project site shall be stabilized to prevent sediment-laden
water from leaving the project site after project completion. All disturbed areas of the project
site shall be vegetated or otherwise permanently stabilized. At a minimum, disturbed areas
must be seeded and mulched to ensure that sufficient cover will develop shortly after final
approval. Mulch without seeding is adequate for small areas to be landscaped before October 1.
2. All temporary ESC and SWPPS measures shall be removed within 30 days after final site
stabilization is achieved or after the temporary measures are no longer needed. Trapped
sediment shall be removed or stabilized onsite. Flow control BMPs impacted during construction
shall be restored. Disturbed soil areas resulting from removal of measures or vegetation shall be
permanently stabilized with seeding or sodding.
Design & Installation
Use the following space to specify the measures to be employed for final stabilization
.
Maintenance
Use the following space to specify maintenance requirements for final stabilization measure.
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STORMWATER POLLUTION PREVENTION AND SPILL (SWPPS) MEASURES
(Reference KCSWDM D.3.5, p. D-131 for additional information)
The purpose of stormwater pollution prevention and spill control is to prevent, reduce, or
eliminate the discharge of pollutants to onsite or adjacent stormwater systems or watercourses
from construction-related activities such as materials delivery and storage, onsite equipment
fueling and maintenance, demolition of existing buildings and disposition of demolition
materials and other waste, and concrete handling, washout and disposal.
The implementation of this SWPPS plan and the construction, maintenance, replacement, and
upgrading of the SWPPS facilities is the responsibility of the Permittee/Contractor until all
construction is approved
.
1. All pollutants, including waste materials, that occur onsite shall be handled and disposed of
in a manner that does not cause contamination of stormwater. Describe how effective
pollutant handling and disposal procedures will be achieved
.
2. Cover, containment, and protection from vandalism shall be provided for all chemicals,
liquid products, petroleum products, and non-inert wastes present on the site. Onsite fueling
tanks shall include secondary containment. Describe how cover and containment for
materials, fuel and other pollutants will be achieved
.
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3. 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 may result in
discharge or spillage of pollutants to the ground or into stormwater runoff must be conducted using spill
prevention measures, such as drip pans. Contaminated surfaces shall be cleaned immediately following any
discharge or spill incident. Emergency repairs may be performed onsite using temporary plastic placed beneath
and, if raining, over the vehicle. Describe additional measures that will be employed to protect the environment
from spills and drips of petroleum products and other pollutants.
4. 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 rates and procedures shall be followed. Describe any additional measures that will be employed to
prevent the over-application and untimely application of chemicals and fertilizers.
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5. Stormwater discharges shall not cause or contribute to a violation of the water quality standard for pH in the
receiving water. Measures shall be used to prevent or treat contamination of stormwater runoff by pH modifying
sources. Describe any additional measures that will be employed to prevent or treat contamination of stormwater
runoff by pH modifying sources.
6. For full compliance with KMC 15.52.110 - Water Quality Standards, the project may need to include measures
for the permanent structures and features constructed under other permits. Describe any additional measures that
must be employed during construction.
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Appendix A & B
Please include the geotechnical report and WWHM 2012 report with your submittal
.