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Technical Information Report
PREPARED FOR:
Renton School District
300 SW 7th Street
Renton, WA 98057
PROJECT:
Maplewood Heights E.S.
130 Jericho Avenue NE
Renton, WA 98059
2230871.10
PREPARED BY:
Jason Hein
Project Engineer
REVIEWED BY:
David Nason, PE
Principal
DATE:
April 2024
Revised June 2024
DEVELOPMENT ENGINEERING
SAMorman 07/05/2024
Surface Water Enginering
JFarah 07/10/2024
Technical Information Report
PREPARED FOR:
Renton School District
300 SW 7th Street
Renton, WA 98057
PROJECT:
Maplewood Heights E.S.
130 Jericho Avenue NE
Renton, WA 98059
2191083.10
PREPARED BY:
Jason Hein
Project Engineer
REVIEWED BY:
David Nason, PE
Principal
DATE:
April 2024
Revised June 2024
I hereby state that this Technical
Information Report for the Maplewood
Heights E.S. project has been prepared
by me or under my supervision, and
meets the standard of care and expertise
that is usual and customary in this
community for professional engineers. I
understand that City of Renton does not
and will not assume liability for the
sufficiency, suitability, or performance of
drainage facilities prepared by me.
06/20/2024
0
Technical Information Report
Maplewood Heights E.S.
2191083.10
Table of Contents
Section Page
1.0 Project Overview ....................................................................................................................... 1
1.1 Purpose and Scope ........................................................................................................ 1
1.2 Existing Conditions ......................................................................................................... 1
1.3 Post-Development Conditions ......................................................................................... 1
1.4 Drainage Basins ............................................................................................................. 1
1.5 Sensitive Areas .............................................................................................................. 2
2.0 Conditions and Requirements Summary ................................................................................. 2
2.1 CR 1 – Discharge at the Natural Location ....................................................................... 2
2.2 CR 2 – Offsite Analysis ................................................................................................... 2
2.3 CR 3 – Flow Control ....................................................................................................... 2
2.4 CR 4 – Conveyance System ........................................................................................... 2
2.5 CR 5 – Erosion and Sediment Control ............................................................................ 2
2.6 CR 6 – Maintenance and Operations .............................................................................. 3
2.7 CR 7 – Financial Guarantees and Liability ...................................................................... 3
2.8 CR 8 – Water Quality ...................................................................................................... 3
2.9 CR 9 – Onsite BMPs....................................................................................................... 3
2.10 SR 1 – Other Adopted Requirements .............................................................................. 4
2.11 SR 2 – Flood Hazard Delineation .................................................................................... 4
2.12 SR 3 – Flood Protection Facilities ................................................................................... 4
2.13 SR 4 – Source Control .................................................................................................... 4
2.14 SR 5 – Oil Control........................................................................................................... 4
2.15 SR 6 – Aquifer Protection Area ....................................................................................... 4
3.0 Off-Site Analysis ....................................................................................................................... 4
4.0 Flow Control, Low Impact Development (LID), and Water Quality Facility Analysis and
Design ....................................................................................................................................... 4
5.0 Conveyance System Analysis and Design .............................................................................. 5
6.0 Special Reports and Studies .................................................................................................... 5
7.0 Other Permits ............................................................................................................................ 5
8.0 CSWPPP Analysis and Design ................................................................................................. 5
8.1 ESC Plan Analysis and Design ....................................................................................... 5
Technical Information Report
Maplewood Heights E.S.
2191083.10
8.2 SWPPS Plan Design ...................................................................................................... 6
9.0 Bond Qualities, Facility Summaries, and Declaration of Covenant ........................................ 6
10.0 Operations and Maintenance Manual ....................................................................................... 6
Conclusion ............................................................................................................................................. 7
Appendices
Appendix A
Figures
1-1............. TIR Worksheet
1-2............. Vicinity Map
1-3............. Soil Map
3-1............. Erosion Hazards Map
3-2............. Steep Slopes Map
3-3............. Slide Hazard Map
3-4............. Flood Hazard Map
3-5............. Coal Mine Hazard Map
3-6............. Aquifer Protection Map
3-7............. Wetland and Water Classifications Map
3-8............. FEMA Flood Hazard Map
Technical Information Report
Maplewood Heights E.S. 1
2191083.10
1.0 Project Overview
1.1 Purpose and Scope
This report accompanies the civil engineering plans and documents for the Maplewood Heights
Elementary School located at 130 Jericho Avenue NE in Renton, Washington. The project site
encompasses Tax Parcel 0847100090 in the City of Renton, King County, Washington. The
parcel is located within the Southeast Quarter of the Northeast Quarter of Section 15, Township
23 North, Range 5 East, of the Willamette Meridian. See Figure 1-2 for a Site Vicinity Map.
The Renton School District is proposing improvements to the Maplewood Heights Elementary
School. The project proposes to update multiple ADA ramps within the park lot, re-grading the
existing ADA parking stalls to meet current standards, install two separate French Drains to
address on-site erosion, provide an asphalt path from the playground to an existing man gate on
the east side of the site, replace damaged fence at several different location around the site and
resurface the existing ball field in the southeast corner of the site. In additional multiple existing
man gates are proposed to be replaced and provide a locking mechanism for school security.
The project site is bounded by 144th Avenue SE to the west of the school, SE 136th Street to the
south and 146th Avenue SE to the east with private residences to the north. There are no
proposed revisions to any portion of the frontage and no proposed changes to the wet or dry
utilities apart from the French Drain connection to the existing onsite stormwater system.
The 2022 City of Renton Surface Water Design Manual (CORSWDM) establishes the
methodology and design criteria used for the project.
1.2 Existing Conditions
The site is the current location for the Maplewood Height Elementary School. The school was
constructed in 1969 with a total building area of 53,303 square feet. Since the construction of the
school the Renton School District has added an additional six classroom portables with a total
area of 5,376 square feet of space for staff and students. The site which the school resides on
has a total area of 377,665 square feet (8.67 Acres).
1.3 Post-Development Conditions
The Renton School District is proposing several improvements to the Maplewood Heights
Elementary School. Upon completion of this project the site will have updated all existing ramps
to meet current ADA standards, revised grading at the existing ADA parking stalls to meet current
ADA standards, a new 6-foot-wide asphalt path from the playground to an existing gate on the
east side of the property, repaired fencing around the site along with a new 6-foot-tall chain-link
fence along the southern property boundary. In addition, the existing ball field will be resurfaced,
and the existing batting cage will also have new chain-link fabric installed.
The proposed improvements will replace 4,998 square feet (0.11 ac) of hard surfaces to the site.
1.4 Drainage Basins
The site is located within the Lake Washington/Cedar River Watershed basin, as delineated by
the King County Department of Natural Resources and Parks Water and Land Resources
Division.
There are no new proposed impervious surfaces within the scope of this project and no proposed
changes to the existing onsite stormwater drainage system.
Technical Information Report
Maplewood Heights E.S. 2
2191083.10
1.5 Sensitive Areas
Upon reviewing the Sensitive Area maps provided by the City of Renton it was determined that a
small portion of the site in the northeast corner of the site has a Steep Slope. There is no work
proposed in this area will not be impacted by this project.
2.0 Conditions and Requirements Summary
The project triggers Full Drainage Review because it results in more than 2,000 square feet of
new and/or replaced impervious surface. Below is a summary of how the proposed project will
meet the Core Requirements (CR) and how it will meet applicable Special Requirements (SR).
2.1 CR 1 – Discharge at the Natural Location
Maplewood Heights E.S. has a single discharge point from a catch basin located in one of the site
entrances on the west property line. There is a second discharge point from a surface water ditch
into a catch basin at the southwest corner of the site. Both points of discharge combine in a public
catch basin in a catch basin located on the east side of Jericho Avenue SE.
Both discharge points will be maintained by this project. There are no proposed changes to the
existing storm system.
2.2 CR 2 – Offsite Analysis
The project is exempt from providing an offsite analysis.
The project does not change the rate, volume, duration, or location of discharge to and from the
project site.
2.3 CR 3 – Flow Control
This project is exempt from providing flow control.
The proposed work for this project is adding less than 5,000 square feet of new plus replaced
impervious surface and is not adding any new pervious surface. The existing storm facilities are
in good working order to the best of our understanding.
2.4 CR 4 – Conveyance System
The conveyance system is not required to be analyzed for conveyance capacity.
The existing onsite conveyance system will not experience a change in flow characteristics as a
result of the proposed project.
2.5 CR 5 – Erosion and Sediment Control
Onsite land disturbance will consist of clearing the work site, demolished damaged fencing and
resurfacing an existing ball field. Erosion and sediment control will be provided with the use of
catch basin inlet protection. See Section 8.0 for Construction Stormwater Pollution Prevention
Plan (CSWPPP) analysis and design.
Technical Information Report
Maplewood Heights E.S. 3
2191083.10
2.6 CR 6 – Maintenance and Operations
Maintenance and operations of all drainage facilities will be maintained by the Renton School
District. The project does not propose any changes to the existing storm system. The existing
Operation and Maintenance Manual will apply to the system.
2.7 CR 7 – Financial Guarantees and Liability
This project will provide financial guarantees and liability per City of Renton requirements. See
the City of Renton Bond Quantities Worksheet in Figure 9-1.
2.8 CR 8 – Water Quality
This project is exempt from providing water quality.
The proposed work for this project is adding less than 5,000 square feet of new plus replaced
pollution generating impervious surfaces.
2.9 CR 9 – Onsite BMPs
This project proposes work on an Individual Lot that is classified as a Large Lot as the site is
larger than 22,000 square feet. Therefore, for CR 9 it must meet the requirements for Large Lot
BMPs, as described in Section 1.2.9.2.2 in the CORSWDM. Due to the existing developed site
conditions, meeting the LID performance requirement is not feasible. The onsite BMPs required
by the City are listed below:
• Full Infiltration: - Existing developed area is designed to drain into the onsite stormwater
system. It is not feasible to meet this BMP.
• Limited Infiltration: Existing developed area is designed to drain into the onsite
stormwater system. It is not feasible to meet this BMP.
• Bioretention: Existing developed area is designed to drain into the onsite stormwater
system. It is not feasible to meet this BMP.
• Permeable Pavement: Existing developed area is designed to drain into the onsite
stormwater system. It is not feasible to meet this BMP.
• Basic Dispersion: Existing developed area is designed to drain into the onsite stormwater
system. It is not feasible to meet this BMP.
• Reduced Impervious Surface Credit: Existing developed area is designed to drain into
the onsite stormwater system. It is not feasible to meet this BMP.
• Native Growth Retention Credit: There is no new impervious surface that could be
mitigated by the native vegetated surface. It is not feasible to meet this BMP.
• Tree Retention Credit: There is no new impervious surface proposed. It is not feasible to
meet this BMP.
Technical Information Report
Maplewood Heights E.S. 4
2191083.10
2.10 SR 1 – Other Adopted Requirements
The project is included in The Lake Washington/Cedar River Watershed Basin. City and County
basin requirements will be followed where applicable.
2.11 SR 2 – Flood Hazard Delineation
The proposed project is not in or adjacent to the 100-year floodplain. See Figure 3-8 for the
FEMA National Flood Hazard map.
2.12 SR 3 – Flood Protection Facilities
This project does not rely on existing flood protection facilities, nor will it modify or construct new
flood protection facilities.
2.13 SR 4 – Source Control
The project proposes the replacement of existing ramps to meet ADA requirements and a new
asphalt path that will not be exposed to any vehicles. Therefore, it does not meet the
requirements for source control purposes.
2.14 SR 5 – Oil Control
The site does not meet high use criteria and is not subject to oil control measures.
2.15 SR 6 – Aquifer Protection Area
The site is not located within any of the Groundwater Protection Areas.
3.0 Off-Site Analysis
The project is exempt from providing an Off-Site Analysis.
Per Section 1.2.2 Core Requirement #2: Offsite Analysis under the Exemption From Core
Requirement #2 this project does not change the rate, volume, duration, or location of discharges
to and from the project site (e.g., where existing impervious surface is replaced with other
impervious surface having similar runoff-generating characteristics, or where pipe/ditch
modification do not change existing discharge characteristics).
4.0 Flow Control, Low Impact Development (LID), and Water Quality Facility
Analysis and Design
The project is not proposing any changes to the existing storm system.
Per Section 1.2.3 Core Requirements #3: Flow Control Facilities under Exemption From Core
Requirement #3 this project has less than 5,000 square feet of new plus replaced impervious
surfaces proposed and less than ¾ acres of new pervious surfaces added. Therefore, we are
exempt from providing any Flow Control Facilities
Per Section 1.2.8 Core Requirements #8: Water Quality Facilities under Exemption From Core
Requirement #8 this project has less than 5,000 square feet of new plus replaced impervious
surfaces proposed and less than ¾ acres of new pervious surfaces added. Therefore, we are
exempt from providing a Water Quality Facility.
Technical Information Report
Maplewood Heights E.S. 5
2191083.10
There are no Low Impact Developments (LID) proposed for this project.
5.0 Conveyance System Analysis and Design
There are no proposed changes to the existing storm system. The existing conveyance system
will be protected and maintained throughout this project.
6.0 Special Reports and Studies
The project is not proposed any changes to the existing storm system. A Geotechnical Report
was not necessary for the scope of the site improvements.
The nearest wetland to the site is more than 300 feet to the northeast. The site stormwater is
collected on site and discharges on the west side of the site and does not drain towards the
wetland. A Wetland Report was not necessary for the scope of the improvements.
No other reports and/or studies were needed for the proposed site improvements.
7.0 Other Permits
No other permits are required for the proposed site improvements.
8.0 CSWPPP Analysis and Design
8.1 ESC Plan Analysis and Design
The proposed development shall comply with guidelines set forth in City of Renton drainage
requirements. The plan will include erosion/sedimentation control features designed to prevent
sediment-laden runoff from leaving the site or adversely affecting critical water resources during
construction. A construction Stormwater Pollution Prevention Plan (CSWPPP) is provided in a
separate document.
The following measures will be shown on the ESC plans and will be used to control
sedimentation/erosion processes:
1. Clearing Limits – All areas to remain undisturbed during the construction of the project will
be delineated prior to any site clearing or grading.
2. Cover Measures – Cover measures will be implemented for the disturbed areas.
3. Perimeter Protection – Filter fabric fences for site runoff protection will be provided at the
downstream site perimeter.
4. Traffic Area Stabilization – Traffic area stabilization is not applicable for this project.
5. Sediment Retention – Inlet sediment protection will be utilized as part of this project.
6. Surface Water Collection – Catch basins and conveyance pipes will provide surface water
collection.
7. Dewatering Control – Water from dewatering operations should be discharged to a well-
vegetated area or to a temporary sediment control facility.
Technical Information Report
Maplewood Heights E.S. 6
2191083.10
8. Dust Control – Dust control measures, including sweeping and water truck, will be
implemented when exposed soils are dry to the point that wind transport is possible; and
roadways, drainage ways, or surface waters are likely to be impacted.
9. Flow Control – Flow control is not required for this project.
10. Control Pollutants – Stormwater pollution prevention measures will be implemented to
prevent, reduce or eliminate the discharge of pollutants to onsite or adjacent stormwater
systems.
11. Protect Existing and Proposed Stormwater Facilities and On-site BMPs – Contractor shall
inspect and maintained protective measures at all times until the completion of the project.
12. Maintain Protective BMPs – All protective BMPs used during construction will be properly
monitored and maintained until the completion of the project.
13. Manage the Project – Contractor shall coordinate in a timely manner all inspection.
8.2 SWPPS Plan Design
The project is proposing the replacement and/or installation of pedestrian ramps to meet current
ADA requirements. In addition, there will be some minor work in existing grassy areas that will
have the potential for dirt and debris to collect in paved areas. Below is a list BMPs from the King
County Stormwater Pollution Prevention Manual dated July 2021, that will be applied throughout
the extent of the project.
• A-20: Concrete and Asphalt Application
• A-26: Landscaping Activities, Vegetation Management, and Irrigation
• A-27: Clearing and Grading of Land for Small Construction Projects
• A-32: Sidewalk Maintenance
9.0 Bond Qualities, Facility Summaries, and Declaration of Covenant
Bond Quantities – A Site Improvement Bond Quantities Worksheet has been completed and
submitted along with Site Plans and this TIR.
Facility Summaries – This project is exempt from Flow Control and Water Quality. A flow Control
and Water Quality Facility Summary Sheet and Sketch is not needed for this project.
Declaration of Covenant – There are no proposed changes to the existing stormwater system. A
Declaration of Covenant is not required for this project.
10.0 Operations and Maintenance Manual
Maintenance and operations of all drainage facilities will be maintained by the owner. There are
no proposed changes to the existing storm water system. The existing Operations and
Maintenance Manual shall be referred to for the existing system.
Technical Information Report
Maplewood Heights E.S. 7
2191083.10
Conclusion
This site has been designed to meet or exceed the requirements of the 2022 City of Renton
Surface Water Design Manual (CORSWDM).
This analysis is based on data and records either supplied to or obtained by AHBL. These documents
are referenced within the text of the analysis. The analysis has been prepared using procedures and
practices within the standard accepted practices of the industry.
AHBL, Inc.
Jason Hein
Project Engineer
April 2024
Revised June 2024
Q:\2023\2230871\10_CIV\NON_CAD\REPORTS\TIR\20240326 Rpt (TIR) 2230871.docx
Technical Information Report
Maplewood Heights E.S.
2191083.10
Appendix A
Figures
1-1....................TIR Worksheet
1-2....................Vicinity Map
1-3....................Soil Map
3-1....................Erosion Hazards Map
3-2....................Steep Slopes Map
3-3....................Slide Hazard Map
3-4....................Flood Hazard Map
3-5....................Coal Mine Hazard Map
3-6....................Aquifer Protection Map
3-7....................Wetland and Water Classifications Map
3-8....................FEMA Flood Hazard Map
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
__________________
__________________
__________________
Renton School District
425-204-2300
300 SW 7th Street
Renton, WA 98057
Jason Hein
AHBL Inc.
253-383-2422
Maplewood Heights E.S.
23
5 E
15
130 Jericho Avenue NE
Renton, WA 98059
X
X
April 2024
X
April 2024
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 ______________________
_____________________________________
Cedar River - Lake Washington
X NE Corner of Site
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
Alderwood gravelly sandy loam 8 - 15 %None
1
Not Required
Not Required
1 & 2
N/A
To be determined
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:
1
Catch Basin Inlet Protection
None Required
Commercial
None
None Required
None
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
_____________
_____________
_____________
_____________
_____________
_____________
_____________
_____________
_____________
_____________
_____________
XX
X
X
X
X
X
None Required None Required
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
X XNone None
2215 North 30th Street
Suite 300
Tacoma, WA 98403
253.383.2422 TEL
253.383.2572 FAX
Maplewood Heights Elementary School
Vicinity Map
Figure 1-2
Soil Map—King County Area, Washington
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/26/2024
Page 1 of 35258950525898052590105259040525907052591005259130525916052591905259220525925052589505258980525901052590405259070525910052591305259160525919052592205259250564170564200564230564260564290564320564350564380
564170 564200 564230 564260 564290 564320 564350 564380
47° 29' 0'' N 122° 8' 54'' W47° 29' 0'' N122° 8' 43'' W47° 28' 50'' N
122° 8' 54'' W47° 28' 50'' N
122° 8' 43'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 10N WGS84
0 50 100 200 300
Feet
0 20 40 80 120
Meters
Map Scale: 1:1,490 if printed on A portrait (8.5" x 11") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: King County Area, Washington
Survey Area Data: Version 19, Aug 29, 2023
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 31, 2022—Aug 8,
2022
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Soil Map—King County Area, Washington
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/26/2024
Page 2 of 3
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
AgC Alderwood gravelly sandy
loam, 8 to 15 percent slopes
9.5 100.0%
Totals for Area of Interest 9.5 100.0%
Soil Map—King County Area, Washington
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/26/2024
Page 3 of 3
Maplewood Heights
Elementary School
Maplewood Heights
Elementary School
Maplewood Heights
Elementary School
Maplewood Heights
Elementary School
Maplewood Heights
Elementary School
Maplewood Heights
Elementary School
Maplewood Heights
Elementary School
National Flood Hazard Layer FIRMette
0 500 1,000 1,500 2,000250
Feet
Ü
SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT
SPECIAL FLOODHAZARD AREAS
Without Base Flood Elevation (BFE)Zone A, V, A99With BFE or DepthZone AE, AO, AH, VE, AR
Regulatory Floodway
0.2% Annual Chance Flood Hazard, Areasof 1% annual chance flood with averagedepth less than one foot or with drainageareas of less than one square mileZone X
Future Conditions 1% Annual
Chance Flood HazardZone X
Area with Reduced Flood Risk due to
Levee. See Notes.Zone X
Area with Flood Risk due to LeveeZone D
NO SCREENArea of Minimal Flood Hazard Zone X
Area of Undetermined Flood HazardZone D
Channel, Culvert, or Storm Sewer
Levee, Dike, or Floodwall
Cross Sections with 1% Annual Chance
17.5 Water Surface Elevation
Coastal Transect
Coastal Transect Baseline
Profile Baseline
Hydrographic Feature
Base Flood Elevation Line (BFE)
Effective LOMRs
Limit of Study
Jurisdiction Boundary
Digital Data Available
No Digital Data Available
Unmapped
This map complies with FEMA's standards for the use of
digital flood maps if it is not void as described below.The basemap shown complies with FEMA's basemapaccuracy standards
The flood hazard information is derived directly from theauthoritative NFHL web services provided by FEMA. This mapwas exported on 3/26/2024 at 8:04 PM and does notreflect changes or amendments subsequent to this date andtime. The NFHL and effective information may change orbecome superseded by new data over time.
This map image is void if the one or more of the following map
elements do not appear: basemap imagery, flood zone labels,
legend, scale bar, map creation date, community identifiers,
FIRM panel number, and FIRM effective date. Map images for
unmapped and unmodernized areas cannot be used for
regulatory purposes.
Legend
OTHER AREAS OF
FLOOD HAZARD
OTHER AREAS
GENERAL
STRUCTURES
OTHER
FEATURES
MAP PANELS
8
B 20.2
The pin displayed on the map is an approximatepoint selected by the user and does not representan authoritative property location.
1:6,000
122°9'12"W 47°29'13"N
122°8'35"W 47°28'49"N
Basemap Imagery Source: USGS National Map 2023