HomeMy WebLinkAbout25-095 Braunstein.TIRSeptember 11, 2025
25-095 Braunstein.TIR
Page 1
DRAINAGE TECHNICAL INFORMATION REPORT
Proposed Pavement
600 SW 13th Street
Renton, Washington
PN: 334040-5025 & 5035
Client:
Braunstein Holding Group
600 SW 13th Street #200
Renton, WA 98057
November 20, 2025
Prepared by:
DEVELOPMENT ENGINEERING, PLLC
9601 Key Peninsula Hwy. NW
Gig Harbor, Washington 98329
(253) 228-0513
www.de-civil.com
DEVELOPMENT ENGINEERING
HBray 12/19/2025
Surface Water Enginering
jfarah 12/22/2025
September 11, 2025
25-095 Braunstein.TIR
Page 2
CONTENTS
Section 1 – Project Overview 3
Pre-Developed Site Conditions 3
Post-Developed Conditions 3
Site Soils 3
Section 2 - Conditions and Requirements Summary 3
Surface Water Design Manual Minimum Core Requirements 3
King County Surface Water Design Manual Special Requirements 4
Section 3 – Level 1 Offsite Analysis 4
Task 1. Study Area Definition and Maps 4
Task 2. Resource Review 4
Task 3. Field Inspection 5
Section 4 - Flow Control and Water Quality Analysis and Design 5
Section 5 - Conveyance System Analysis and Design 7
Section 6 – Special Reports and Studies 8
Section 7 – Other Permits 8
Section 8 – CSWPPP Analysis and Design 8
Section 9 – Bond Quantities, Facility Summaries, and Declaration of Covenant 8
Section 10 - Operations and Maintenance Manual 8
Table A 9
Figure 1: Technical Information Report (TIR) Worksheet 10
Site Vicinity Map 13
Existing Site Conditions 14
Basin Study Areas 16
Sensitive Areas 17
100 Year 24-Hour Isopluvial 19
Drainage Basin Map 20
Appendix A: Operation and Maintenance Manual 21
Appendix B: Declaration of covenant 23
Appendix C: Geotechnical Report 28
September 11, 2025
25-095 Braunstein.TIR
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SECTION 1 – PROJECT OVERVIEW
We are pleased to submit this drainage report for the construction of the proposed pavement on the
existing tax parcels located at 600 SW 13th Street in the city of Renton, Washington, as shown on the
attached Site Vicinity Map, Figure 2. It is our understanding from the discussions that we have had, our
knowledge with the area and our site visit that you intend to construct a paved parking lot the currently
vacant parcel.
Since the impervious surfacing you’ve planned to install totals to less than 5,000 sqft, the City of Renton
will require you to submit a “Full Drainage Review”, requiring you to comply with all nine core
requirements from section 1.2 and all five special requirements from section 1.3 of the 2022 Renton
Surface Water Design Manual (RSWDM).
Pre-Developed Site Conditions
The site consists of two existing lots of record that are currently undeveloped which have been cleared
of any native vegetation since prior to 2000. The site is triangular in shape and measures approximately
285 feet in height, west to east with a base of 45 feet north to south and encompasses 0.14 acres. The is
nearly level with a slight slope to the north. The overall topographic relief across the site is less than 1
foot. The site is bounded by SW 13th Street to the north, SR 405 to the south and unopened Seneca
Avenue SW right of way to the east.
Post-Developed Conditions
Based on our conversations with you and our review of the provided site plan, it is our understanding
that the proposed development will include the pavement of the vacant lot to create additional off-
street parking for your business. The proposed driveway/parking will measure 4,875sqft for a total
added impervious area of 4,980sqft. In addition to the parking lot approximately 3,500sqft of disturbed
right of way will be revegetated with grass. No additional clearing is proposed at this time.
See the attached site plans and Table A for a complete breakdown of the site areas. For this project, we
are proposing to utilize sheet flow dispersion into the SW 13th Street ROW which will then convey the
drainage to an existing catchbasin located in 13th Street to the east of the site.
Site Soils
A geotechnical infiltration report was prepared by our office dated July 28, 2025. Based on the results of
that investigation, infiltration is not feasible for this project, see attached.
SECTION 2 - CONDITIONS AND REQUIREMENTS SUMMARY
Per the FEMA Flood Map no portion of the site is not located within a 100-year flood plain. According to
the SWMM the site should be subject to “Directed Drainage Review”. The site will disturb less than
7,000 sqft of area and will add less than 5,000 sqft of new impervious area since 2000. It is assumed that
a combination of BMPs will be necessary and will comply with stormwater management as they pertain
to the rules and regulations set forth by King County’s SWMM, July 2021 as adopted by the City of
Renton.
Surface Water Design Manual Minimum Core Requirements
Core Requirement 1. Discharge at the natural location:
Portions of the site sheet flows to the north where it enters adjacent SW 13th Street row. Currently
there is a catch basin that is located in the east central portion of the site that collects some surface
water and conveys it to the south. The proposed drainage will be sheet flow dispersed to the north
while the grate on the existing catch basin will be replaced with a solid lid.
September 11, 2025
25-095 Braunstein.TIR
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Core Requirement 2. Off-Site Analysis:
An Off-Site Analysis is included in Section 3 of this report. The analysis includes site inspection and
research as required to meet the requirements of a Level 1 off-site analysis.
Core Requirement 3. Flow Control:
Flow control is not applicable to this project since we proposing less than 5,000sqft of new impervious
area.
Core Requirement 4. Conveyance System:
No conveyance system is proposed at this time.
Core Requirement 5. Temporary Erosion & Sediment Control:
Basic erosion control measures have been shown on the attached plans with a more detailed
explanation given in Section 8 of this report.
Core Requirement 6. Maintenance & Operation:
An operation and maintenance manual has been included with this report.
Core Requirement 7. Financial Guarantees & Liability:
It is anticipated that a bond will be required for this development.
Core Requirement 8. Water Quality:
This project will not be required to meet the basic water quality measures, as the total amount of
pollutant generating surfacing is less than 5,000 sqft.
Core Requirement 9. Flow Control BMPs:
This project will direct the site drainage to the street drainage system see Section 4 of this report for
further details.
2022 RSWDM Special Requirements
Per the FEMA Flood Map no portion of the site is located within the 100-year flood plain. There are no
wetlands mapped on any portion of the site. No development is proposed within any wetland buffer
areas.
SECTION 3 – LEVEL 1 OFFSITE ANALYSIS
Task 1. Study Area Definition and Maps
The site is located within the Duwamish-Green River watershed. The site slopes down from south to
north at grades of less than 1 percent. Overall topographic relief across the site is less than 1 foot.
Stormwater from the proposed pavement will be mitigated through use of a sheet flow dispersion to the
existing street drainage system. The proposed development will not negatively impact native drainage
patterns. See Section 4 – Flow Control for details.
Task 2. Resource Review
The following is a summary of the resources reviewed to identify any potential sensitive areas within,
adjacent to and downstream of the proposed site.
• Wetlands: iMap mapping shows no wetlands on or near the property.
• Streams and 100-year Floodplains: No flooding hazard is mapped on or near the property.
September 11, 2025
25-095 Braunstein.TIR
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• Erosion Hazard Areas: iMap mapping shows no areas as being mapped as an erosion hazard
area.
• Landslide Hazard Areas: iMap mapping shows no areas on or near the property as being mapped
as a potential landslide hazard area.
• Seismic Hazard Areas: iMap shows no seismic hazard on or near the property.
• Drainage Complaints: iMap mapping shows no drainage complaints in the project area.
See Figures for maps.
Task 3. Field Inspection
Level 1 Inspection:
1. Investigate any problems reported or observed during the resource review.
No problems were identified within the resource review.
2. Locate all existing/potential constrictions or lack of capacity in the existing drainage system.
No problems identified.
3. Identify all existing/potential downstream drainage problems as defined in Section 1.2.2.1.
The existing road drainage system discharges into a natural ravine through a CMP culvert that is
exposed and suspended above the channel. This area appears to have washed out some time
ago but is currently in a stable condition.
4. Identify existing/potential overtopping, scouring, bank sloughing, or sedimentation.
No evidence was observed of these issues.
5. Identify significant destruction of aquatic habitat or organisms.
None noted.
6. Collect qualitative data on features such as land use, impervious surfaces, topography, and soil
types.
The site and surrounding areas generally consists of urban commercial properties. There was
little evidence of concentrated drainage systems other than what was associated with the road
systems.
7. Collect information on pipe sizes, channel characteristics, drainage structures, and relevant
critical areas (e.g., wetlands, streams, steep slopes).
As mentioned, there is a catch basin structure located on the site that is currently accepting
water from the site. At the time of our site visit the structure was covered with a metal plate.
The SW 13th Street row includes a catch basin that is located to the east of the site at the
intersection of SW 13t hand Seneca Street.
8. Verify tributary basins delineated in Task 1.
The attached Figure 7 Basin Study Area accurately reflects the basin areas based on our field
observations.
9. Contact neighboring property owners or residents in the area about past or existing drainage
problems, and describe these in the report (optional).
Not done.
10. Note the date and weather conditions at the time of the inspection.
The inspection was performed in the afternoon of August 27, 2025. The weather was clear and
sunny, no downstream deficiencies were noted during our investigation.
SECTION 4 - FLOW CONTROL AND WATER QUALITY ANALYSIS AND DESIGN
The proposed drainage will be maintained by directing the impervious surface drainage to the north and
sheet flow dispersing into the SW 13th Street right of way and then into the street drainage system. The
project is required to implement on-site BMP’s following section 1.2.9.2 Individual Lot BMP
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25-095 Braunstein.TIR
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requirements as identified below for Small Lots. We have included Section 1.2.9.2.1 from the RSWMM
with a brief discussion of the viability of each requirement.
1.2.9.2.1 SMALL LOT BMP REQUIREMENTS
IF the proposed project is on a site/ lot smaller than 22,000 square feet, THEN on-site BMPs must be
applied as specified in the requirements below OR the project must demonstrate compliance with the
LID Performance Standard ( described in Section 1.2.9.1.B) using an approved continuous runoff model.
Projects on small lots are typically single family residential improvements ( e.g., homes, outbuildings,
etc.) but could be a small commercial development..
1. The feasibility and applicability of full dispersion as detailed in Appendix C, Section C.2.1 must
be evaluated for all target impervious surfaces. If feasible and applicable, full dispersion must
be implemented as part of the proposed project. Typically, small lot full dispersion will be
applicable only in subdivisions where enough forest was preserved by tract, easement, or
covenant to meet the minimum requirements for full dispersion in Appendix C, Section C.2.1.1.
Full dispersion is not feasible as there is insufficient room for the required 100 foot vegetated
flow paths due to the size of the lot.
2. Where full dispersion of target impervious roof areas is not feasible or applicable, or will cause
flooding or erosion impacts, the feasibility and applicability of full infiltration as detailed in
Appendix C, Section C.2.2 must be evaluated ( note, this will require a soils report for the site/
lot). If feasible and applicable, full infiltration of roof runoff must be implemented as part of
the proposed project.
Full infiltration is not feasible because of a high groundwater potential and site quality of the
site soils.
3. All target impervious surfaces not mitigated by Requirements 1 and 2 above, must be
mitigated to the maximum extent feasible using one or more BMPs from the following list. Use
of a given BMP is subject to evaluation of its feasibility and applicability as detailed in
Appendix C. Feasible BMPs are required to be implemented. The BMPs listed below may be
located anywhere on the site/ lot subject to the limitations and design specifications for each
BMP. These BMPs must be implemented as part of the proposed project..
a. Full Infiltration per Appendix C, Section C.2.2, or per Section 5.2, whichever is applicable
Full infiltration is not feasible because of a high groundwater potential and site quality
of the site soils.
b. Limited Infiltration per Appendix C, Section C.2.3,
Limited infiltration is not feasible due to the quality of soils onsite and potential depth
to groundwater and the steep slopes located on site.
c. Bioretention per Appendix C, Section C.2.6, sized as follows:
i. SeaTac regional scale factor equals 1.0: In till soils, provide bioretention volume
based on 0.6 inches of equivalent storage depth; in outwash soils provide
bioretention volume based on 0.1 inches of equivalent storage depth,
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25-095 Braunstein.TIR
Page 7
ii. SeaTac regional scale factor greater than 1.0: In till soils, provide bioretention
volume based on 0.8 inches of equivalent storage depth; in outwash soils,
provide bioretention volume based on 0.4 inches of equivalent storage depth,
BioRetention is not feasible due to the quality of soils onsite and potential depth to
groundwater.
d. Permeable Pavement per Appendix C, Section C.2.7,
Permeable pavement is not feasible due to the site soils and potential groundwater
depth.
4. All target impervious surfaces not mitigated by Requirements 1,2 and 3 above, must be
mitigated to the maximum extent feasible using the Basic Dispersion BMP described below.
Use of Basic Dispersion is subject to evaluation of its feasibility and applicability as detailed in
Appendix C. Feasible BMPs are required to be implemented. Basic Dispersion BMPs may be
located anywhere on the site/lot subject to the limitations and design specifications cited in
Appendix C. The BMP must be implemented as part of the proposed project.
a. Basic Dispersion per Appendix C, Section C.2.4,
Basic dispersion is feasible and is proposed for this project.
5. BMPs must be implemented, at minimum, for an impervious area equal to at least 10% of the
site/ lot for site/ lot sizes up to 11,000 square feet and at least 20% of the site/ lot for site/ lot
sizes between 11,000 and 22,000 square feet. For projects located in Zone 1 of the Aquifer
Protection Area, these impervious area amounts must be doubled. Doubling of the minimum
impervious area required for BMP implementation in Zone 1 of the Aquifer Protection Area is
not required for projects located within 200 feet of a steep slope hazard area, landslide
hazard, or erosion hazard area. If these minimum areas are not mitigated using feasible BMPs
from Requirements 1, 2, 3, and 4 above, one or more BMPs from the following list are required
to be implemented to achieve compliance. These BMPs must be implemented as part of the
proposed project.
a. Reduced Impervious Surface Credit per Appendix C, Section C.2.9
b. Native Growth Retention Credit per Appendix C, Section C.2.10.
c. Tree Retention Credit per Appendix C, Section C.2.14
Not applicable to this project.
6. The soil moisture holding capacity of new pervious surfaces ( target pervious surfaces) must be
7. protected in accordance with the soil amendment BMP as detailed in Appendix C, Section
C.2.13.
8. Any proposed connection of roof downspouts to the local drainage system must be via a
perforated pipe connection as detailed in Appendix C, Section C.2.11.
SECTION 5 - CONVEYANCE SYSTEM ANALYSIS AND DESIGN
No conveyance system is proposed at this time.
September 11, 2025
25-095 Braunstein.TIR
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SECTION 6 – SPECIAL REPORTS AND STUDIES
A geotechnical infiltration report was prepared by our office, dated July 28, 2025. A copy of the report is
included for reference.
SECTION 7 – OTHER PERMITS
No other permits are anticipated at this time.
SECTION 8 – CSWPPP ANALYSIS AND DESIGN
Typical erosion control measures have been shown on the provided plans. Given the limited amount of
area to be worked at any given time and the near surface soils, the chance of erosion from leaving the
site is minimal. While we have shown a silt fence along the down slope portions of the clearing limits, it
is our opinion that little surface runoff will leave the site uncontrolled and that this will be adequate
erosion protection for the site. Surface areas that are cleared are expected to be seeded or landscaped
shortly after they have been cleared further minimizing the chance for erosion. In our opinion the plans
as prepared are adequate for a project of this nature.
SECTION 9 – BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT
A Declaration of Covenant is included in this report under Appendix B.
SECTION 10 - OPERATIONS AND MAINTENANCE MANUAL
An operation and maintenance manual is included with this report.
September 11, 2025
25-095 Braunstein.TIR
Page 9
TABLE A
Proposed Impervious Surface: Fill in all applicable blanks below to list the square footage of all new and
existing impervious surface areas proposed on your parcel. When calculating impervious surface areas for
buildings do not list living/useable space square-footage, instead list the building roof square-footage, measured to
the outside edge of eve or gutter.
Impervious New Existing Total
Roof Area
(House, Attached Garage,
Covered Patio, Covered Deck,
Covered Porch) - sq. ft. - sq. ft. - sq. ft.
Roof Area
(Detached Garage) sq. ft. sq. ft. sq. ft.
Roof Area
(All Out Buildings) sq. ft. sq. ft. sq. ft.
On-site Driveway Area 4,175 sq. ft. 0 sq. ft. 4,175 sq. ft.
Off-site Driveway Area 700 sq. ft. 0 sq. ft. 700 sq. ft.
Walkways / Sidewalks / Stepping Stone Area sq. ft. sq. ft. sq. ft.
Uncovered Porch and / or Patio Area sq. ft. sq. ft. sq. ft.
Uncovered Decks Area sq. ft. sq. ft. sq. ft.
Replaced Impervious Area
(Considered New Impervious) sq. ft. sq. ft. sq. ft.
All Other Impervious Areas sq. ft. sq. ft. sq. ft.
Total New Impervious Surface Area 4,875 sq. ft.
Total Existing Impervious Surface Area 0 sq. ft.
Total Impervious Areas 4,875 sq. ft.
Total Clearing Limits, Site Disturbance / Graded Areas
(Include Septic Drain fields Primary and Reserve) 8,375 sq. ft.
Total New Pervious Areas
[(Total Clearing Limits, Site Disturbance/Graded Areas) – (Total New Impervious Areas)] 3,500 sq. ft.
Total Excavation Volume
120 Cubic Yard
Total Fill Volume (Exported) Cubic Yard
Total Fill Volume (Imported) 120 Cubic Yard
For DPER Staff Use ONLY
Parcel Number: ____________________
Approved By: _______________________
Application Number: ______________
Date: __________________
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
Braunstein Holding Group
600 SW 13th Street #200
Renton, WA 98057
Glen Coad, PE
Development Engineering, PLLC
(253) 228 - 0513
Braunstein Parking
23
5
19
600 SW 13th Street
X
X
X
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 ______________________
Full Drainage review all 9 minimum requirements.
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
Not mapped Flat None
X
None Noted
Site
All 9
1
11/20/25
Not Applicable
N/A
N/A
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:
N/A <5,000SQFT PGIS
None required
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
X Sheet flow along
north side
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
September 11, 2025
25-095 Braunstein.TIR
Page 13
Not to Scale Approximate Location
DE-CIVIL, PLLC
P.O. Box 446
Tacoma, WA 98401
Ph (253) 228-0513
www.de-civil.com
SITE VICINITY MAP
Braunstein Parking
600 SW 13th Street
Renton, Washington
Job No: 25-095 September 2025 Figure 2
September 11, 2025
25-095 Braunstein.TIR
Page 14
DE-CIVIL, PLLC
P.O. Box 446
Tacoma, WA 98401
Ph (253) 228-0513
www.de-civil.com
EXISTING SITE CONDITIONS
Braunstein Parking
600 SW 13th Street
Renton, Washington
Job No: 25-095 September 2025 Figure 3
September 11, 2025
25-095 Braunstein.TIR
Page 15
DE-CIVIL, PLLC
P.O. Box 446
Tacoma, WA 98401
Ph (253) 228-0513
www.de-civil.com
USDA SOILS MAP
Braunstein Parking
600 SW 13th Street
Renton, Washington
Job No: 25-095 September 2025 Figure 4
September 11, 2025
25-095 Braunstein.TIR
Page 16
DE-CIVIL, PLLC
P.O. Box 446
Tacoma, WA 98401
Ph (253) 228-0513
www.de-civil.com
BASIN STUDY AREAS
Braunstein Parking
600 SW 13th Street
Renton, Washington
Job No: 25-095 September 2025 Figure 4
September 11, 2025
25-095 Braunstein.TIR
Page 17
DE-CIVIL, PLLC
P.O. Box 446
Tacoma, WA 98401
Ph (253) 228-0513
www.de-civil.com
SENSITIVE AREAS
Braunstein Parking
600 SW 13th Street
Renton, Washington
Job No: 25-095 September 2025 Figure 5
September 11, 2025
25-095 Braunstein.TIR
Page 18
DE-CIVIL, PLLC
P.O. Box 446
Tacoma, WA 98401
Ph (253) 228-0513
www.de-civil.com
DRAINAGE COMPLAINTS
Braunstein Parking
600 SW 13th Street
Renton, Washington
Job No: 25-095 September 2025 Figure 7
September 11, 2025
25-095 Braunstein.TIR
Page 19
DE-CIVIL, PLLC
P.O. Box 446
Tacoma, WA 98401
Ph (253) 228-0513
www.de-civil.com
100 YEAR 24-HOUR ISOPLUVIAL
Braunstein Parking
600 SW 13th Street
Renton, Washington
Job No: 25-095 September 2025 Figure 6
September 11, 2025
25-095 Braunstein.TIR
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DE-CIVIL, PLLC
P.O. Box 446
Tacoma, WA 98401
Ph (253) 228-0513
www.de-civil.com
DRAINAGE BASIN MAP
Braunstein Parking
600 SW 13th Street
Renton, Washington
Job No: 25-095 September 2025 Figure 7
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APPENDIX A: OPERATION AND MAINTENANCE MANUAL
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#10 – Maintenance Checklist for Filter Strips (Basic and CAVFS):
Drainage System
Feature
Defect or Problem Condition When Maintenance is
Needed
Results Expected When
Maintenance is Performed
General Sediment
Accumulation on
Grass
Sediment depth exceeds 2
inches.
No sediment deposits in
treatment areas.
General Vegetation When the grass becomes
excessively tall (greater than 10
inches); when nuisance weeds
and other vegetation starts to
take over.
Grass is healthy and nuisance
vegetation controlled such that
flow not impeded. Grass should
be mowed to a height between
3-4 inches.
General Trash and Debris
Accumulation
Trash and debris accumulated
on the filter strip.
No trash or debris present. Any
trash and debris removed from
filter.
General Erosion/Scouring Eroded or scoured areas due to
flow channelization, or higher
flows.
No eroded or scoured areas,
cause of erosion or scour
addressed.
For ruts or bare areas less than
12 inches wide repair the
damaged area by filling with
crushed gravel (basic filter strip)
or a 50/50 mixture of crushed
gravel and compost (CAVFS).
The grass will creep over the
rock in time. If bare areas are
large, generally greater that 12
inches wisde, the filter strip
should be re-graded and re-
seeded. For smaller bare areas,
overseed when bare spots are
evident.
General Flow Spreader Flow spreader uneven or
clogged so that flows are not
uniformly distributed through
entire filter width.
Flows are apread even;y over
entire filter width/ Spreader is
level and clean.
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APPENDIX B: DECLARATION OF COVENANT
not applicable - do not use
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APPENDIX C: GEOTECHNICAL REPORT