HomeMy WebLinkAboutRS_Civil_Drainage_Report_170629_v3
Montano Residence
(Unit 3785) NE 12th Street, Renton WA 98059
Job (#)
Drainage Report
for Small Lot Residence
Prepared for
Chateau Meridian Development
P.O. Box 6490
Kent, WA 98032
Prepared by
O’Bunco Engineering International Inc.
1042 W James Street. Suite 103
Kent, WA 98032
June 2017
May 2017 L-i Montano Re/N.E. 12TH ST. PRELI. TIR
TABLE OF CONTENTS
P.E. Stamp Page .......................................................................................................................... 1
1.0 Project Overview ............................................................................................................... 2
2.0 Preliminary Conditions & Requirements Summary ........................................................... 3
3.0 Off-Site Analysis ................................................................................................................ 4
4.0 Conveyance System Design and Analysis ........................................................................ 4
5.0 Erosion / Sedimentation Control Design ........................................................................... 5
6.0 Financial Guarantees and Liability ................................................................................. 6
7.0 Maintenance and Operations ............................................................................................ 6
8.0 Revised Flow Control Requirements Summary/Storm Drainage Calculations .................. 6
APPENDIX A:
1. Topographic Map
2. Site Drainage Plans C1, C2, C3 & Figure 3
APPENDIX B: Maps & Drawings
1. Flow Control (Reference 11-A)
2. Groundwater Protection Areas (Reference 11-B)
3. Soil Survey (Reference 11-C)
May 2017 Page.1 Montano Re/N.E. 12TH ST. PRELI. TIR
P.E. Stamp Page
O’Bunco Engineering Inc
The staff of O’Bunco Engineering under the supervision and direction of undersigned
professional engineer have prepared this report whose stamp and signature appears
hereon.
Samuel Obunike, P.E.
Principal
May 2017 Page.2 Montano Re/N.E. 12TH ST. PRELI. TIR
1.0 Project Overview
Project Profile:
Property address & legal description is: Quarter Section 3, Township 23 N,
Range 5 E W.M.; King County WA
Soil type: According to the King County soils map, the site is underlain with
Alderwood Soils: Alderwood gravelly Sandy Loam (AgD), hydrologic soils group
C.
Approximately 0.105 acres is developed with SW, DW surface & roof top
Approximately 0.115 acres is developed with grass cover
No Wetland was encountered
Proposed improvement: Residential one lot & Landscaping
Site Description:
The site is located at 5200 block of NE 12th Street in Renton, Washington (Vicinity Map
Figure 1). The site consists of one rectangular tax parcel (No. 323059154) with a total
area of 9,440 square feet. The site slopes gently toward the northeast at magnitudes
ranging from 2.5 to 9.1 percent. The overall topographic relief across the property is
approximately 14 feet. The property is vegetated with sparse evergreen and deciduous
trees and grasses. The site is bordered to the east and west by single family
residences, to the south by NE 12th St.
SOIL CONDITIONS:
Soil Type: AgD
Slope: 15% to 30%
Erosion Potential: Low
Erosive Velocity: Low
May 2017 Page.3 Montano Re/N.E. 12TH ST. PRELI. TIR
PROPOSED PROJECT:
The approximately 0.217 acres’ site including 1 existing paved driveway and
vegetated with sparse evergreen and deciduous trees and grasses to be constructed of
one new single-family residences on the existing parcel.
2.0 Preliminary Conditions & Requirements Summary
The following is a summary list of the core requirements and special requirements
according to City of Renton (COR) modified King County SWDM 2016 and brief
description how the requirements are addressed:
Core Requirement #1 (Discharge at the Natural Location): This project will
preserve existing drainage paths. The project also proposes to restore the
natural drainage paths for the frontage street and infiltrate roof/lot drain onsite
(see site drainage plans C1, C2, C3 & Figure 3).
Core Requirement #2 (Offsite Analysis): The existing drainage conditions were
evaluated and runoff from the existing impervious surface do not have offsite
impact but contained with the site.
Core Requirement #3 (Flow Control): Flow control considerations was bases on
final Geotech report. Full dispersion-N/G (no good) because the property does not
have 100 ft of flow path available; The proposed new impervious surfaces (roof,
and drive/walkway) will be mitigated using full infiltration. As a result, no
additional flow control is required.
Core Requirement #4 (Conveyance System): Not applicable (N/A).
Core Requirement #5 (Erosion and Sediment Control): The proposed erosion
control erosion and sediment plan will consist of filter fabric fences to be placed
along the north, east margin of the site. Contractor will comply the COR/Ecology
necessary permit during construction.
Core Requirement #6 (Maintenance and Operations): The proposed storm
drainage system will be owned, operated and maintained by the owner. See
exhibit B for maintenance & operation manual.
May 2017 Page.4 Montano Re/N.E. 12TH ST. PRELI. TIR
Core Requirement #7 (Financial Guarantees and Liability): Financial Guarantees
and Liability not applicable (N/A).
Core Requirement #8 (Water Quality): The COR 2016 drainage manual requires
water treatment for project that add 5,000 square ft or more of new pollution
generating impervious surface (PGIS). The proposed developed (PGIS) will add 750
sq. ft of NEW PGIS. Based upon the threshold, water quality is not required per the
manual.
3.0 Off-Site Analysis
Upstream: The proposed project does not have off-site runoff entering the site.
The frontage property has extruded asphalt curb which drains to downstream
catch basin “B” (See attached topographic survey map)
Downstream: We do not observe any areas that indicated flooding or any undue
wash-off of soils during our site visit on march 5th 2017 (from one quarter of a
mile downstream). Sheet flow from the site drains north to northeast parcels #
0323059054 which is heavily wooded brushy area and with Honey Creek flowing
northwest from this parcel, cross Hoquiam avenue and enters May Creek
approximately 2 miles from the site which discharges to Lake WA.
4.0 Conveyance System Design and Analysis
No storm drainage conveyance system is proposed for the project and such the
onsite conveyance system not applicable (N/A).
May 2017 Page.5 Montano Re/N.E. 12TH ST. PRELI. TIR
5.0 Erosion / Sedimentation Control Design
All temporary erosion and sediment control requirements have been designed in
accordance with Core Requirement #5 of the 2016 COR SWDM section 1.2.5
Erosion and Sediment Control. These standards prevent or reduce pollution of
stormwater runoff caused by construction activities. The Temporary Erosion and
Sediment Control Plan has been designed to minimize the amount of sediment
laden runoff that leaves the project site, protecting downstream properties from
construction and grading activities. Since project does not meet 1 or more acre
land disturbance, CSWPP is not required. Temporary erosion and sediment
control plans has been prepared and attached in appendix. The following is a
narrative describing proposed TESC measures: Clearing Limits: Clearing limits is
shown clearly on TESC plans with details sufficient to install and maintain during
construction. Cover Measures: The type and location of temporary cover
measures to be used onsite is shown on the TESC plans. Perimeter Protection:
Silt fencing location and details for installation is shown on TESC plans. Traffic
Area Stabilization: Construction entrance locations is shown on the TESC plans.
Dust control measures shall also be addressed on the plans.
Sediment Retention: Silt fencing and catch basin inserts shall be used primarily to
trap sediments. Also, stabilization of the site will help prevent sediments from
migrating.
Wet Season Requirements: A list of applicable wet season requirements shall be
shown on the TESC plans. From October 1st through April 30th, no soils shall be
exposed for more than two consecutive working days. Also, exposed soils shall
be covered.
May 2017 Page.6 Montano Re/N.E. 12TH ST. PRELI. TIR
6.0 Financial Guarantees and Liability
Per RMC 4.6.030 Drainage Standard Section L, the flow control BMPs (Downspout
Infiltration) for the single family residential building, Finan cial Guarantees and Liability
not applicable (N/A).
Declaration of Covenant will be filed for this site for the owner to operate and maintain
and is provided in Exhibit A of this report.
7.0 Maintenance and Operations
The maintenance & operations for the proposed dry well and infiltration trench
have been provided in Exhibit B under Declaration of covenant.
8.0 Revised Flow Control Requirements Summary/Storm Drainage
Calculations
Flow Control (Core Requirement No. 3)
The proposed development qualifies for exemption as follows:
Since the proposed new project met the basic exemption of section 1.2.3, new plus
replaced impervious is 4,028 sq. ft / or less than 5,000 sq. ft and less than 0.75 ac
(actual pervious added is 5,372 sq. ft) of new pervious surface.
In addition, the property is located within the city of Renton Flow Control Duration
Standard (Matching Forested Site Conditions). The proposed new impervious surfaces
will be mitigated using full infiltration (BMP’s to include drywell for driveway stormwater
May 2017 Page.7 Montano Re/N.E. 12TH ST. PRELI. TIR
management and infiltration trench for roof drain stormwater management designed to
the “40/20 rule” section 1.2.3. Therefore, no additional flow control is required.
Please see below flow control and water quality facility analysis and design concept-
Based upon the 2017 City of Renton Drainage Manual, the following steps are required
to determine the mitigation of storm water runoff of the development:
Full Dispersion-N/G (no good)-the property does not have 100 feet of flow path
available on each new lot;
Full Infiltration- acceptable- The soils on the property are fine to medium sands
and should provide adequate depth for full infiltration.
The proposal is to mitigate all new impervious surfaces for the 1 single lot improvement.
Design:
Exiting Impervious surface on property-
Ex. Asphalt Driveway- 750 sq. ft
Ex. Concrete Path- 30 sq. ft
Total existing 780 sq. ft
Proposed lot impervious surface
2,918 sq. feet of roof area and patio;
1,110 sq. ft. (P.G.I.S) of asphalt/concrete driveway & 60 sq. ft. of path (Total =
1,170 sq. ft)
Total impervious proposed 4,028 sq. ft
Mitigation using full infiltration per very conservative calculation (see attached) &
section C.2.2 or 5.2.
10 *20 infiltration trench & 1 drywell were prosed for roof drain & driveway to
mitigate the propped impervious surfaces.
May 2017 Page.8 Montano Re/N.E. 12TH ST. PRELI. TIR
Developed Impervious-
Un-mitigated New impervious 0 sq. ft
Existing Impervious 780 sq. ft
Total developed 4,028 sq. ft
The difference between the existing and developed impervious surfaces is 3,248
sq. ft or less than 5,000 sq. feet. Therefore, storm water detention is not required per
the manual.
Proposed BMPs
The proposed Infiltration Trench for roof mitigation located at the back of the property
and infiltration drywell for driveway & walkway surface runoff containment, located at the
front of the property, is underground stormwater detention facility which utilizes
percolation into the ground as at least part of it outlet. The selected BMPs has
numerous environmental benefits to include to reduce the peak rate of runoff leaving the
site and also recharge groundwater into the ground.
Sizing Infiltration Trench & Drywell
Trench (22’x10’x4’ deep bed of ½” clean crushed stone with synthetic filter fabric
completely around the stone-dimensions)-, because of limited space, 2 rows trenches
with combinations of two 12 feet long 24” diameter perforated pipes with two 6 foot long
manifolds and stone materials to add storage capacities are used to reduce trench
footprints (C1).
Drywell, -because of limited space, 1 drywell with combinations of bottomless concrete
tank and surrounded with stone materials are used to reduce trench footprint and add
capacity (C1).
Appendix A
Montano Residence
1. Topo Map
2. Site Drainage Plans C1, C2 , C3 & Figure 3
Appendix B:Maps & Drawings
Montano Residence
1. Flow Control
2. Groundwater Protection Area
3. Soil Survey
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Flow Control Application Map
Reference 11-A
Date: 01/09/2014
Flow Control Standards
Peak Rate Flow Control Standard (Existing Site Conditions)
Flow Control Duration Standard (Existing Site Conditions)
Flow Control Duration Standard (Forested Conditions)
Flood Problem Flow
Unincorporated King County Flow Control Standards
Renton City Limits
Potential Annexation Area
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Cedar Valley Sole SourceAquifer Project Review Area
Streamflow Source Area
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Aquifer Protection Area Zones
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Potential Annexation Area
Groundwater Protection Areas Date: 01/09/2014
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SS EE JJ oo nnee ss RR dd
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114488tthhAAvveeSSEEWWMMeerrcceerrWWaayy115544tthhPPllSSEEEEddmmoonnddssAAvveeNNEEAAbbeerrddeeeennAAvveeNNEEWWeessttVVaalllleeyyHHwwyyEast Valley RdEast Valley Rd,§-405
,§-405
Reference 11-C
Renton City Limits
Potential Annexation Area
Groundwater Protection Area Boundary
Aquifer Protection Area Zone 1
Aquifer Protection Area Zone 1 Modified
Soil Type
AgB
AgC
AgD
AkF
AmB
AmC
An
BeC
BeD
Bh
Br
EvB
EvC
EvD
EwC
InA
InC
InD
KpB
KpC
KpD
Ma
Ng
Nk
No
Or
Os
OvC
OvD
PITS
Pc
Pk
Pu
Py
RdC
RdE
Re
Rh
Sh
Sk
Sm
So
Tu
Ur
W
Wo
Date: 01/09/2014
0 1 2
MilesµSoil Survey