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� TECHNICAL INFORMATION REPORT '
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Short Plat
2132 Harrington Place N.E.
Renton, Washington
Prepared for:
Camie Ng, Renton Properties
1530 — 33rd Avenue South
Seattle, WA 98144
(206) 334-8773
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November 27, 2007
Revised January 10, 2008
Our Job No. 12653
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CIVIL ENGINEERING,LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES
18215 72ND AVENUE SOUTH KENT,WA 98032 (425)251-6222 (425)251-8782 Fnx
� i BRANCH OFFICES • OLYMPIA,WA ♦ TACOMA,WA ♦ SACRAMENTO,CA ♦ TEMECULA,CA
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TECHNICAL INFORMATION REPORT �`N ,N `
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Camie Ng Short Plat = C . W
Renton, Washington � , �?
Our Job. No. 12653 �b8 �°`�yJ I
TABLE OF CONTENTS
1.0 PROJECT OVERVIEW
Figure 1 —Technical Information Report (TIR) Worksheet
Figure 2—Vicinity Map
Figure 3 —Drainage Basins, Subbasins, and Site Characteristics
Figure 4—Soils Map and Documentation
2.0 CONDITIONS AND REQUIREMENTS SUMMARY
2.1 Analysis of the Core Requirements
2.2 Analysis of the Special Requirements
2.3 City of Renton Conditions of Approval /SEPA
3.0 OFF-SITE ANALYSIS
3.1 Upstream Basin Analysis
3.2 Downstream Drainage Course Analysis
Figure 5—Downstream Drainage System Table
Figure 6—Downstream Drainage Map
Figure 7—Upstream Drainage As-Built Map
Figure 8—Aerial Photo
Figure 9—Topographic Nlap
Figure 10—Renton Storm Systcm Liap
Figure 11 —Assessor's Map
Figure 12—FEMA Map
Figure 13 —Sensitive Areas Map
4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN
4.1 Flow Control Analysis and Design
4.2 Water Quality Analysis and Design
5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN
6.0 SPECIAL REPORTS AND STUDIES
I� 7.0 OTHER PERMITS
8.0 TEMPORARY EROSION AND SEDIMENTATION CONTROL
9.0 BOND QUANTITY WORK SHEET
10.0 MAINTENANCE AND OPERATIONS STANDARDS
''� 1?653.004.doc
1.0 PROJECT OVERVIEW
The project proposes a short subdivision of two existing tax parcels totaling approximately
0.98 acre into six single-family residential lots. The property is located in the R-8 zone. The site
address is 2132 Harrington Place N.E. and the site is comprised of King County Taac Parcel
Nos. 042305-9210 and 9134. The site has street frontage on N.E. 21st Street and
Harrington Place N.E.
Existing topography at the site consists of a slight downward slope from northeast to southwest.
There is an existing single-family residence on the site that will be demolished to accommodate
the proposed lots.
According to the United States Department of Agriculture-Soil Conservation Service (SCS) King
County Soil Survey, the on-site soils consist of Indianola loamy fine sand. This soil is in SCS
Hydrologic Soil Group A. The existing land cover consists of forest, lawn, and some impervious
areas that include the existing house and driveway. The subject property mostly drains to
Hamngton Place N.E., except for a narrow strip along the eastem boundary draining to the
private road on the property to the east.
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12653.004.doc
FIGURE 1 - TECHNICAL
I N FORMATION REPORT
(TIR} WORKSHEET
King County Department of Development and Environmental Services
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
Part 1 PROJECT OWNER AND PROJECT ENGINEER Part 2 PROJECT LOCATION AND DESCRIPTION
Project Owner Camie N Renton Pro erties Project Name
,4ddress 1530 33rd Avenue South Camie N Short Plat
Seattle, WA. 98144 �ocation: 2132 Hamn on Place NE, Renton
Phone 206 322-3022 Township 23 North
Project Engineer Ra mond van der Rcest,P.E. Range 5 East
Company Bar hausen Consultin En ineers, Inc. Section 4, SW '/4 of the NW '/<
Address/Phone 18215—72nd Avenue South
Kent, WA 98032/ 425 251-6222
Part 3 TYPE OF PERMIT APPLICATION Part 4 OTHER REVIEWS AND PERMITS
❑ Subdivision HPA ❑ DFW HPA ❑ Shoreline Management
� Short Subdivision ❑ COE 404 ❑ Rockery
❑ Grading ❑ DOE Dam Safety ❑ Structural Vaults
❑ Commercial ❑ FEMA Floodplain ❑ Other
❑ Other ❑ COE Wetlands
Part 5 SITE COMMUNITY AND DRAINAGE BASIN
Community:
Renton
Drainage Basin:
Ma Creek
Part 6 SITE CHARACTERISTICS
❑ River ❑ Floodplain
❑ Stream ❑ Wetlands
❑ Critical SVeam Reach ❑ Seeps/Springs
❑ Depressions/Swales ❑ High Groundwater Table
❑ Lake ❑ Groundwater Recharge
❑ Steep Slopes ❑ Other
12653.004.doc
Part 7 SOILS
Soil Type Slopes Erosion Potential Erosive Velocities
A(Indianola,InC 4 to 15 percent Slight
❑ Additional Sheets Attached
Part 8 DEVELOPMENT LIMITATIONS
REFERENCE LIMITATION/SITE CONSTRAINT
❑ None None
❑
❑
❑
❑ Additional Sheets Attached
Part 9 ESC REQUIREMENTS
MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS
DURING CONSTRUCTION AFTER CONSTRUCTION
� Sedimentation Facilities � Stabilize Exposed Surface
� Stabilized Construction Entrance � Remove and Restore Temporary ESC Facili6es
� Perimeter Runoff Control � Clean and Remove All Silt and Debris
� Clearing and Grading Restrictions ❑ Ensure Operation of Permanent Facilities
� Cover Practices ❑ Flag Limits of SAO and Open Space Preservation Areas
� Construction Sequence ❑ Other
❑ Other
Part 10 SURFACE WATER SYSTEM
❑ Grass Lined Channel ❑ Tank ❑ Infiltration Method of Analysis
❑ Pipe System ❑ Vault ❑ Depression SBUH/Rational
❑ Open Channel ❑ Energy Dissipater ❑ Flow Dispersal
❑ Dry Pond ❑ Wetland ❑ Waiver
❑ Wet Pond ❑ Stream ❑ Regional Detention
Brief Description of System Operation Existin catch basins and storm sewers in Harrin ton Place N.E. collect and
conve stormwater runoff to the outfall at Ma Creek, north of Edmonds Avenue N.E.
Facility Related Site Limitations
Reference Facility Limitation
N/A N/A N/A
12653.004.doc
Part 11 STRUCTURAL ANALYSIS Part 12 EASEMENTSITRACTS
❑ Cast in Place Vault ❑ Drainage Easement
❑ Retaining Wall � Access Easement
❑ Rockery>4'High ❑ Native Growth Protection Easement
❑ Structural on Steep Slope ❑ Tract
❑ Other ❑ Other
Part 13 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 attachments. To the best of my knowledge the information provided here is accurate.
S� ned/Dated /�7�0�
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Q�GHA�� CAMIE NG SHORT PLAT VICINITY MAP
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m z 2132 HARRINGTON PLACE N.E.
�` G�� .= RENTON, WASHINGTON �
`''+a��o�N•`' (BCE JOB#12653)
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FIGURE 3 - DRAINAGE
BASINS, SUBBASINS ,
AND SITE
CHARACTERISTICS
DaB7rio oo�orftoNe eo►erl�u►P
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GAMIE NG PROPERTY ��` �_�- _. .�. � . , '
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FORESTED 0.51 AC. FORESTED 0.09 AC. FORESTED 0.60 AC. � �°"'J �i
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�� 1650000 FEET • R.4 E. R. 5 E. RervroN�.9 e+r. 12'30" (loins sheef 1 1) � RdC la �f
RENTON 1.T Ml. 12L�O7�30��
Scaie 1:24 000 N
Orthophotobase compiled in 1970 Dy USGS. Planimetric
1 3; 44 '� o t 2 rn�i�.s
r____ _ ' ' ' _� _ detail obta�ned Irom USGS 7y2�m�nute series maps.
, --- -
-�e--�.-� e--- � - -- -------._.. _z -
5000 4000 3000 2000 1000 O 5000 1000o Fec� Polyconic pro�ection. 1927 North American datum.
10,000-foot grid based on Washington coordinate system,
n. ,.<;, 5c��oi..•.��,�:o north tone.
K��,"�d(; ' _ . ��! i'.�=:F:�+, :.ASI+,I�1GTCihd NU. `
' SHFFT NO. 5
3.2.2 KCRTS/RUNOFF FlLES METHOD—GENERATING TIME SERIES
TABLE 3.2.ZB EQUIVALENCE BETWEEN SCS SOIL TYPES AND KCRTS SOIL TYPES
SCS Soil Type SCS KCRTS Soil Notes
Hydrologic Group
Soil Group
Aldervvood (Ag6,AgC,AgD) C Till
Arents, Alderwood Material (Am6, AmC) C Till
Arents, Everett Material (An) B Outwash 1
Beausite BeC, BeD, BeF) C Till 2
Bellingham (Bh) D Till 3
Briscot (Br) D Till 3
Buckley(Bu) D Till 4
Earlmont (Ea) D Till 3
Edgewick (Ed) C Till 3
Everett(EvB, EvC, EvD, EwC) A/B Outwash 1
� Indianola (InC, InA, InD) A Outwash 1
Kitsap (KpB, KpC, KpD) C Till
Klaus (KsC) C Outwash 1
Neilton (NeC) A Outwash 1
�Newberg (Ng) B Till 3
Nooksack (Nk) C Till 3
Norma (No) D Till 3
Orcas (Or) D Wetland
Oridia (Os) D Till 3
Ovall (OvC, Ov�, OvF) C Till 2
Pilchuck (Pc) C Till 3 �
i Puget (Pu) D Till 3
; Puyallup (Py) B Till 3
�' Ragnar(RaC, RaD, RaC, RaE) B Outwash 1
Renton (Re) D Till 3
Salal (Sa) C Till 3
, Sammamish (Sh) D Till 3
Seattle (Sk) D Wetland
Shalcar(Sm) D Till 3
Si (Sn) C Till 3
� Snohomish (So, Sr) D Tilf 3
Sultan (Su) C Till 3
Tukwila(Tu) D Till 3
Woodinville (Wo) D Till 3
Notes:
1. Where outwash soits are saturated or underiain at shallow depth(<5 feet)by glacial till,they should
be treated as till soils.
2. These are bedrock sals,but calibration of HSPF by King County DNR shows bedrock soils to have
similar hydrologic response to till soils.
3. These are alluvial soils,some of which are underlain by glacial till or have a seasonally high water
table. In the absence of detailed siudy,these soils should be treated as till soils. .
4. Buckley sals are formed on the low-permeability Osceola mudflow. Hydrologic response is
assumed to be similar to that of till soils.
1998 Surface Water Design Manual 9/1/98
3-25
gravelly coarse sand to very gravelly loamy sand. the presence of a consolidated substratum at a depth.-�-� from very dark grayish brown td brown and dark and the mean annual air temperature is about SO' F.
Depth to the IIC horizon ranges from 18 to 36 of 7 to 20 feet. This substratum is the same mate- yeliowish brown. The C horizon ranges from dark The frost-free season is 150 to more than 200 da s.
Y
inches.
rial as that in the Alderwoo soi s. grayish brown to pale olive and from loamy fine sand F.levation ranges from about sea level to S00 feet.
Some areas are up to 5 percent included Alderwood Some areas are up to 5 percent included Norma, to sand. Thin lenses of silty material are at a In a representative profile, the surface layer
:oils, on the more rolling and undulating parts of Seattle, and Tukwila soils, all of which are poorly depth of 4 to 7 feet iti some places, and subsoil are very dark brown and dark yellowish-
he landscape; some are about S percent the deep, drained. Soils included with this soil in ma in make u brown silt loam that extends to a depth of about 2A
sandy Indianola soils; and some are up to 25 percent Runoff is slow to medium, and the erosion hazard PP S P
Neilton very gravelly loamy sands. Also included is slight to moderate. no more than 25 percent of the total acreage. Some in�ies. The substratum is olive-gray silty clay
in mapping are areas where consolidated glacial till, Most of the acreage is used for timber. Capabil- areas are up to 10 percent Alderwood soils, on the loam. It extends to a depth of 60 inches or more.
which characteristically underlies Alderwood soils, ity unit VIs-1; woodland group 3f3. more rolling and undulating parts of the landscape; Kitsap soils are used for timber and pasture.
some are up to 8 percent the deep, gravelly Everett
is at a depth of 5 to 15 feet. and Neilton soils; some are up to 15 percent Kitsap Kitsap silt loam, 2 to 8 percent slopes (KpB),--
Permeability is rapid. The effective rooting soils, which have platy lake sediments in the sub- This undulating soil is on low terraces of the major
depth is 6o inches or more. Available water capac- ,,.�� Indianola Series soil; and some are up to 15 percent Ragnar soils, valleys of the Area. Areas range from S acres to
ity is low. Runoff is slow, and the erosion hazard which have a sandy substratum, more than 600 acres in size and are nearly circular
is slight. The Indianola series is made up of somewhat Permeability is rapid. The effective rootin to irre ular in sha e.
This soil is used for timber and pasture and for excessively drained soils that formed under conifers 8 8 p Some areas are one-eighth to
urban development. Capability unit IVs-1; woodland in sandy, recessional, stratified glacial drift, depth is 60 inches or more. Available water capac- a half mile wide and up to 3 or 4 miles long.
ity is moderate. Runoff is slow to medium and the Representative profile of Kitsap silt loam 2 to
group 3f3. 'fhese undulating, rolling, and hwnmocky soils are on erosion hazard is slight to moderate. � 8 percent slopes, in pasture, 820 feet west and 330
terraces. Slopes are 0 to 30 percent. The annual 'lhis soil is used for timber and for urban devcl- feet south of east quarter corner of sec. 28, T. 25
Everett gravelly sandy loam, 5 to 15 percent precipitation is 30 to 55 inches, and the mean
� slopes (EvC) .--This soil is rolling. Areas are annual air temperature is about 50° F. The frost- opment. Capability unit IVs-2; woodland group 4s3. N. , R. 7 E. :
irregular in shape, have a convex surface, and range free season is 150 to 210 days. Elevation ranges
from 25 acres to more than 200 acres in size. Run- from about sea level to 1,000 feet. Indianola loamy fine sand, 0 to 4 percent slopes Ap--O to S inches, very dark brown (lOYR 2/2) silt
off is slow to medium, and the erosion hazard is In a representative profile, tlie upper 30 inches (InA).--This soil occupies smooth terraces in long loam, dark grayish brown (lOYR 4/2) dry; mod-
' is brown dark ellowish-brown and li ht olive- narrow tracts adjacent to streams. Areas range from erate, medium, granular structure; slightly
slight to moderate. � Y � g about 3 to 70 acres in size.
Soils included with this soil in mapping make up brown loamy fine sand. This is underlain by olive hard, very friable, nonsticky, nonplastic;
no more than 25 ercent of the total acrea e. Some sand that extends to a depth of 60 inches or more Soils included with this soil in mapping make up many roots; medium acid; abrupt, smooth bound-'
p B no more than 20 percent of the total acreage. Some ary.
areas are up to 5 percent Alderwood soils, which (pl. I, right) . areas are up to S percent Alderwood soils, on the 62--5 to 24 inches, dark yellowish-brown (lOYR 3/4)
overlie consolidated glacial till; some are up to Indianola soils are used for timber and for urban more rolling and undulating parts of the landscape; silt loam, brown (lOYR 5/3) dry; 2 percent
20 percent Neilton very graveliy loamy sand; and development. some are about 10 percent the deep, gravelly Everett iron concretions; weak, coarse, prismatic
some are about 15 percent included areas of Everett and Neilton soils; some are up to 10 percent Indian- structure• sli htl hard friable sli htl
, 8 Y . , 8 Y
soils where slopes are more gentle than 5 percent Indianola loamy fine sand, 4 to 15 percent slopes ola loamy fine sand that has stronger slopes; and sticky, slightly plastic� many roots• sli htl
and where they are steeper than 15 percent. (InC) .--This undulating and rolling soil has convex some areas are up to 10 percent the poorly drained acid• abru t wav boundar � g Y
This Everett soil is used for timber and pasture slopes. It is near the edges of upland terraces. Norma, Shalcar, Tukwila soils. ' P ° y Y• 18 to 21 inches
thick.
and for urban development. Capability unit VIs-1; Areas range from 5 to more than 100 acres in size. Runoff is slow, and the erosion hazard is slight. IIC--24 to 60 inches, olive-gray (SY 5/2) silty clay
woodland group 3f3. Representative profile of Indianola loamy finc This soil is used for timber. Capability unit loam, light gray (5Y 7/2) dry; many, medium
sand, 4 to 15 percent slopes, in forest, 1,000 feet
Everett gravelly sandy loam, 15 to 30 ercent west and 900 feet south of the northeast corner of IVs-2; woodland group 4s3. and coarse, prominent mottles of dark yellowish
brown and strong brown (lOYR 4/4 and 7.SYR
slopes (EvD .--This soil occurs as long, narrow sec. 32, T. 25 N. , R. 6 E. : Indianola loamy fine sand, 15 to 30 ercent 5/8
p ) ; moderate, thin and medium, platy struc-
areas, mostly along drainageways or on short slopes slopes (InU) .--This soil is along entrenched streams. ture; hard, firm, sticky, plastic• few roots
between terrace benches. It is similar to Everett 01--3/4 inch to 0, leaf litter. Soils included with this soil in mapping make up to a depth of 36 inches, none below; stron 1
gravelly sandy loam, 0 to S percent slopes, but in 621ir--0 to 6 inches, brown (lOYR 4/3) loamy fine no more than 25 percent of the total acreage. Some acid. g Y
most places is stonier and more gravelly. sand, brown (lOYR 5/3) dry; massive; soft, areas are up to 10 percent Alderwood soils; some are
Soils included with this soil in mapping make up very friable, nonsticky, nonpiastic; many about S percent the deep, gravelly Everett and Neil- The A horizon ranges from very dark brown to dark
no more than 30 percent of the total acreage. Some roots; slightly acid; clear, smooth boundary. ton soils; some are up to 15 percent Kitsap soils, brown. The e horizon ran es from dark
areas are up to 10 percent Aiderwood soiis, which 4 to 8 inches thick. which have platy, silty lake sediments in the sub- brown to dark brown and f�om silt loam tolsiltyhclay
overlie consolidated glacial till; some are up to 5 B22ir--6 to 15 inches, dark yellowish-brown (lOYR soil; and some are up to 15 percent Indianola loamy loam. The platy IIC horizon ranges from grayish
percent the deep, sandy Indianola soils; some are 4/4) loamy fine sand, brown (lOYR S/3) dry; fine sand that has milder slopes. brown to olive gray and from silt loam to silty clay
up to 10 percent Neilton very gravelly loamy sand; massive; soft, very friable, nonsticky, non- Runoff is medium, and the erosion hazard is moder- loam that has thin lenses of loamy fine sand in
and some are about 15 percent included areas of plastic; canmon roots; slightly acid; clear,
ate to severe. places. Brownish mottles are common in the upper
Everett soils where slopes are less than 15 percent. smooth boundary. 6 to 15 inclies thick. � This soil is used for timber. Capability unit part of the IIC horizon.
Runoff is medium to rapid, and the erosion hazard C1--15 to 30 inches, light olive-Urown (2.SY S/4) VIe-1� woodland group 4s2. Some areas are up to 10 percent included Alderwood
is moderate to severe. loamy fine sand, yellowish brown (lOYR 6/4) '
htost of the acreage is used for timber. Capa- dry; massive; soft, very friable, nonsticky, gravelly sandy loam; some are up to 5 percent the
� very deep, sandy Indianola soils; and some are up to
bility unit VIe-1; woodland group 3f2, nonplastic; common roots; slightly acid; Kitsa Series � ercent the
P p poorly drained Bellingham, Tukwila,
gradual, smooth boundary. 12 to 17 inches ; and Seattle soils.
j The Kitsap series is made up of moderately a�ell �Vater flows on top of the substratum in winter.
Everett-Alderwood avelly sandy loams, 6 to 15 C2--30ttoc60 inches olive (SY S/4) sand li ht
g drained soils that formed in glacial lake deposits, Permeability is moderate above the substratum and
percent slopes (EwC� .-- is mapping unit is about brownish ra � 2.5Y 6/2) dr sin le rain•
equal parts Everett and Alderwood soils. The soils 8 Y � Y; g g . under a cover of conifers and shrubs. These soils very slow within it. The effective rooting depth is
� are rolling. Slopes are dominantly 6 to 10 percent loose, nonsticky, nonplastic; few roots;
, are on terraces and strongly dissected terrace about 36 inches. Available water capacity is moder-
but range from gentle to steep. Most areas are slightly acid. Many feet thick. fronts. They are gently undulating and rolling and ate to moderately high. Runoff is slow to medium,
irregular in shape and range from 15 to 100 acres moderately steep. Slopes are 2 to 70 percent. snd the erosion hazard is slight to moderate.
or more in size. In areas classified as Everett There is a thin, very dark brown A1 horizon at Platy, silty sediments are at a depth of 18 to 40 This soil is used for timber and pasture. Capabil-
the surface in some laces. The B horizon ran• es inches. The annual precipitation is 35 to 60 inches, ity unit IIIe-1; woodland group 2d2.
soils, field examination and geologic maps indicate P �
16
17
TABI.F 2.--ESTiMAT£D PROPERTIES�:+• OF TIiG SOILS--Continued
Cl.assificstion Coarse Percentage �'ercentage passing sieve--f ont.
De th to Practzon passing
p Depth greater sieve-- CorrosiviLy
Soil series and map seasonal prom Avaiiable
than 3 Permeability uater Reac�ion Shrink-swell
symbols hi[ah erater surface i�o. 10 No. 40 No, ppp PoCential
table USDA texture Unified AASI{0 inches in No, li 2 � m� capaciLy Uncoated
diameter (1�.7 �mn•) { ) (0.42 mm.) {O.O'jl� mm, si:eel Concretie
Feet Inches Percent Inches hr. Inches in
� � �
- of soil
o-l0 60-90 �o-�S 35-5o i5-2S 2.0-6.3 o.og-o.l�
��erett: EvB, LbC, CvD, (�) 0-17 Gravelly sandy loam-- SM A-1 �
5.1-b.5 Low---------- fiiE�h---------
F�. " 10 45-55 �i0-50 2Q_ p hfoderate to
For Alderwood part of' 17-32 Very �ravelly �andy UM A-1 �- 3 10-15 ` b.3_20.0 0.06-0.08 � hi�h.
EuC, see Aldyrwood 1oam. 5.1-6.� Low---------- Lox----------
b� �-35 5-15 p_� Moderate to
series. 32-60 Very r_,ravelly coarse GW or CP A-1 5-� 35� > > >20.0 0.02-0.O�i � high.
sand. 5.�i-6.J Lox-----^---- Low---------
- Hoderate.
Indianoia: InA, InC, ��)
p�30 Loamy fine >and_-_--- SM A-2 0 9�-L00 85-100 Fi0-75 ?p-3Q b.3-20.0 Q.49-0.11 5.1-6.� Lou---------
3o-i�o Sand----------------- SP-SM A-3 0-5 90-l0o T5-�O SS-75 5-l0 > t 5 _^ Loc,----------
20.0 0.4�-0.06 6.1-6. L�w________ �7ocierate.
InD. �W---------- ikoderate.
Kitsap: KpB, K�C, KP��--- L�'3 0-2�e Silt loam------------ �"� A-4 O 95-100 90-100 9Q-100 c35-95 0.63-2.0 0.20-0.24 '� -- Moderate-----
�•5-6•5 Low-------- Lorr Lo
?_4-60 Silty clay loam------ MH A-6 0 95-100 95-��0 95-100 90_Ipp G.06 0.0�+-0.06 moderate.
5�1-h•5 P�taderate----- High----..____ L,ox Lo
20-40 }�0-5� 34-��� 10-20 moderate.
K1aus: KsC-------------- (�) 0-Fi4 Very ;ravelly loamy GP-GM A-1 5-10 6.3-20.0+ 0.03-0.05 t�.0-.�i.0 Low---------
sand and very �;rav- -- Moderate Lo Moderate to
el.ly sand.
hi�;h. hirh.
i�ixe3 alluvi.al land: ?Wa.
?roperties are too
variable to rate.
Seasonal high watier
table is ai: the
surface.
----- � 0-18 Very �ravelly loamy CP-CM A-1 0-15 40-SO � 3o-t+o 10-e� --
:1eilton: ?�feC------- � ) : �-.l0 6.3-20.0 0.03-0.OS 5.1-5.0 T.ow--_------- derate----- h to
sahd. ' r'�O � Toderate
,� �ravelly sand---- GlJ or GP A-1 5-1� 35-�+5 ;; �-37 5-15 p_-
lt3-oo Ver� 5 >20.0 q.02-0.04 high.
�- 5.6-6.5 t.ou---------- Lou---------- Moderate.
", -- 3-t. 0-00 Very fine sandy loam-- ML A-4 0 100 � 100 ?',5-�> >�-60 0.53-2.0 o.z6-o.i8
:•iewtv rE;: �,�,------- `
� 5•6-7-3 Lox---------- hloc3erai:e----- Low to
----
�
.:
•, moderate.
- ----= 1, 0-60 Sil� Loa.m------------- Mv n-�+ � 200 � 100 qj-L00 y5-1o0 0.63-2.0 0.2�-0.2�i
ilooksack: ?:l:-------- 3- 5.6-�.5 Low-^------- '
-- t•toderate----- t�u to
--- g,y A-2 0 95-1� mocierate.
i;orma.: ido--------------- 0-1 0-EO Sunc�y loam--------- 85-100 35-55 ?5-35 %.0�.3 0.12-0.14
5.6-6.j Lorr----------- Ifi�h--------- t+i�derate.
----- ------ ------ -----
Orcas: Or--------------- 0-� 0-60 Spha6num peat--------- pt A ----- >20.0 0.30-O.kO k.�-
5.0 ffigh shrink, I[i�h--------_ fiigh.
Iow swe.il.
_ 1_2 p_�1� Silt loam------------- � A-6 or A-7 0 100 95-100 9j_�pp gp_100 0.2�2.0 0.20-0.2�F 4.5-7. Low--------
Oridia: �s--�---------- 3
-- tiigh--------- I.ou to higtt.
0_3(, craw:.11y ioan,--------- Sc or SM A-4 0-5 7o-F3o �5-75 50-60 35-5o b.3-2.0 0.12-o.zb.
Ovall: QvC, cyvA, OvF---- ��) 5.1-6.5 Low----------
hl�dArate----_ C,ow to
jo Weathered andesite. moderate.
Pilchuck: Pc, Pk-------- 2-4 0-38 i.oa"�'
f.ine sand------ SM A-2 0 85-100 'E�4-7-00 60-"l5 �xJ-30 6.3-20.0 0.08-0.10 b.l-��.3 Low----------
(Fine saiidy loam - Lou------____ �w to
surface layer in moderate,
Pk]
38-60 Gravelly sand-------- SP A-1 �-15 55-95 5�'� 3o-ti0 o-y >20.0 0.03-0.05 6.6-7.3 Low-------
---- Low---------- LoW.
See footnotes at end of' taole.
38 39
.s:1R .
TABLF: 4.--IIEGREE OF LIMI'CATIONS FOR TOWN AMD COUNTRY PLA13NI33G--Continued
TABLG 4,--DEGRF.E OF LIAIITATIONS FOR T01YN ANp COUNCRY PI.ANNINC,--Continued
Shaliow Septic tank ! —
�� Foundations for filter fields Sewage lagoons Soil series and map Foundations for Shallrna Septic tank
Soil series and map low buildings excavations . symbols low buildings
symbols ` - excavations filter fields Sewage iag000s
-- Severe: flood
---- Severe: seasonal Severe: seasonal Severe: flood hazard; Klaus: KsC-------------- g
hi h watex table, seasonal high �+ater hazard. Sli ht anc2 moderate: Severe: very Siight and moderate: Severe: slope;
i3riscot: Qr----'"'-" high tiaater taUle; � t�le. moderate if slo e ravell
flood hazard. p g y• moderate if slopc
1 is more than 8 rapid to very
percent, is more than 8 rapid perme-
__--- Severe: seasonal Severe: seasonal Severe: slow P��e� SOOT��icomatter. percent; possible ability.
Buckley: �u-------- hi h water table• a1�ility; seasonal S pollution hazard.
high water table. g h�_�}t water taUle.
Mixed alluvial
Severe: tidal land: Ma-------------- Severe: seasonal Severe: flood Severe: flood
Severe: tidal Severe: tidal Severe: tidal flooding. high water table; Severe: flood
Coastai beaches: CU----- flooding- flooding. hazaxd. Fazard.
flooding. flood hazard; hazard; rapid
Severe: flood vari.ab2e textures. permeability.
__--- �Severe: seasonal Severe: seaso��ai Severe: flood �azard.
Earlmont: �-a�'--��- high water table; high water table. hazard; seasonal Neilton: NeC----------
high water table. -- Slight and moderate: Severe: ve
fiood hazard; low moderate if slope gravell � Slight and moderate: Severe: slope;
shear strength. is more than 8 Y' ��derate if slope very rapid
Severe: flood ` Ie �enc tPan 8 rmea
Severe: flood �• percent. Pe bility.
Severe: flood �`
--- Severe: flood hazard; rapid � P �' t; ossible
'" pollution hazard.
hazaxd. hazard. f�e�Qability in y:
Edgewick: Cd--------' hazard. �:
suUstratum. ;� Newberg: Ng------------- Sevcre: seasonai Moderate: flooci Severe: flood Severe: ML soil;
� l�igh water table; hazard. hazard; seasonal
� � flood hazard; flood hazard.
Nonc to slight: Severe: GM soil; ; low shear strength. high water table.
t�verett: Severe: �ei'Y rapid perme-
_____________ �one to slight---- SS�,}�1e
EvB------- gravelly. po�lution hazard. ability. Nooksack: Nk-----------_
Severe: flood Severe: E1ood
Sli ht and moderate: Sevcre: C>ht soils; hazard; loa shear hazaxd. Severe: flood Severe: iNL soil;
Sliglit and modexate: Severe: Ve3'Y mo�erate if slope siope; rapid strength. hazard. flood hazard.
����, EwC--------------- ravell �rmeability.
is more tlian 8 n Noima: No_______________ Severe: seasonal Severe: seasonal Sevcre: flood
For Alde n000d part of msdmoreethan58Qpe g percent; possible Severe: moderately
EwC, see AgC. high water table; high water table; hazard; seasonal ra id erme-
percant. pollution hazard• Severe: (�t soil; flood hazard; 2ow flood hazard. hi h water tat>le. P p
Severe: slope; Severe: slope;
___-- Severe: slope---- ossit�le pollution slope; rapid shear strength, g ability; flood
hazard.
EvD----------`--- very gravelly. P perneaY�ility. Orcas: Or---------------
hazard. Severe: organic Severe: seasonal Severe: seasonal Severe: organic
� soil. liigh Water table; hi h water table•
Indianola: I Severe: SP-Shf organic soil. g � soil.
__--- 1None to sli ht---- Severe: coarse No�ie to slight: rapid organ.ic soil.
S ossible pollution soil; OriBia: Os-------______. Severe: seasonal Severe: seasonal Severe: flood
inA---------'---�- � texture. jlazard. permeability. Severe: flood
SP-SM high ioater table; higli water table. hazard; seasonal
________-- ISlight and moderate: .Severe: coarse S}moderate mfdsl�e $esoil; rapid flood hazard; low hazard.
�n�' I rnoderate if slope texture. ermeability. shear stxength, high water table.
is more than 8 F
is more than S percent; possi.Ule Ovall:
percent. pollution hazard. OvC____________________ Severe for build- Severe: bedrock Severe: !>edrock at Severe: slope;
Se�lere: slope-------- Severe: siope;
_____--- Severe: slope; Severe: slope; rapiJ perme- in s with
InD-------- coarse texture. g at a depth of 20
___- a depth of 20 to bedrock at a
slippage. aUility. basements. to 40 inches. 40 inches; slope, de th of 20 to
I�toderate for P
buildings witF►- 40 inches.
�toderate: slo e. out basements.
Kitsap: ______ ��erate: seasonal Moderate: seasonal Sevcre: very slow � P pyp___________
--------- Severe: slope;
KpB� high water table; high water table; permeability. Severe: bedrock Severe: slo e;
moderately well bedrock at a at a de th of P Severe: slope;
low sheaz depth of 20 to � bedrock at a bedrock at a
strength. drained. 20 to 40 inches, depth of 20 to to
Severe: very slo�a_.., Severe: slope. �F______________ ___ 40 inches, deptlt of 2
4Q inciies. �
KpC----------`"'"-"'"' Severe: seasonal Moderate: slope; e�eability. - - Severe: slope---- Severe: slo e; 40 inches.
high water table; seasonal high P - P Severe; slo e------
water taUle. bedrock at a P Severe: slope.
low shear strength; deptfi of 20 to
moderate slippage 40 inches.
potential. slo e; Severe: slope; very Scvere: slope.
e:
on
a
1
Se
ver P
eas . 't .
KpD-------------"----' Severe: s ,easonal h�gh siow permeabit� y '
; ' high water table;
'' low shear strength; water taUle.
� severe slippage
potentzal.
59
58 '
's;,
�. ' !6B_3R6��0-T9
2.0 CONDITIONS AND REQUIREMENTS SUMMARY
2.1 Analysis of the Core Requirements
Core Requirement No. 1: Discharge at the Natural Location.
Response: This project proposes to discharge at the natural location, which is at
Hanington Place N.E. and N.E. 21st Street. Adverse impacts on the downstream system
are not anticipated.
Core Requirement No. 2: Off-Site Analvsis.
Response: Refer to the Level 1 Off-Site Analysis in Section 3.0 of this report. This
report hereby fulfills the requirements of Core Requirement No. 2.
Core Requirement No. 3: Flow Control.
Response: We are qualifying for the peak flow control exemption by limiting the
amount of impervious area, while implementing best management practices. As the new
impervious area subject to vehicular use is less than 5,000 square feet, water quality
treatment is not required. Please see Section 4.0 of this report.
Core Requirement No. 4: Conveyance System.
Response: Please refer to section 5 of this report. No on-site storm drains are proposed,
and roof runoff will discharge onto splash blocks. The existing storm drain is off-site
and,to the best of our knowledge, does not have any existing flooding problems.
Core Requirement No. S: Erosion and Sediment Control.
Response: This project site will concur with this requirement by implementing an
erosion and sediment control plan, based on best management practices (BMP's) as
stipulated in the 2005 King County, Washington Surface Water Design Manual
(KCSWDM), including specified clearing limits, cover measures, providing perimeter
protection in the form of silt fences,traffic area stabilization, sodding, and hydroseeding.
Core Requirement No. 6: Maintenance and Operations. �i
Response: This project will concur with maintenance and operations requirements of the
Ciry of Renton for projects of this nature.
Core Requirement No. 7: Financial Guarantees and Liability.
Response: This project will concur with all financial guarantees and liability
requirements of the City of Renton for projects of this nature. ,
Core Requirement No. 8.• Water Qualitv.
Response: As the proposed new pollution generating impervious surface (PGIS) is less
than 5000 square feet, this project is exempt from water quality treatment per the 1990
KCSWDM.
12653.004.doc
2.2 Analysis of the Special Requirements
Special Requirement Nos. 1, 2, 3, and 4—Other Adopted Areas Specific Requirements.
Response: This site does not meet the threshold of these requirements.
Special Requirement No. S—Special Water Quality Controls.
Response: This development does not meet the threshold of this requirement.
Special Requirement No. 6—Coalescing Plate Oil/water Separators.
Response: This development does not meet the threshold of this requirement.
Special Requirement Nos. 7 and 8— Closed Depressions, and Use of Lakes, Wedands, or
Closed Depression for Runoff Control.
Response: This development does not meet the threshold of these requirements.
Special Requirement No. 9—Floodplain/Floodway Delineation.
Response: This site is not adjacent to a stream, lake, wetland, or closed depression.
Special Requirement No. 10—Flood Protection Facilities.
Response: This project does not propose to construct a new or modify an existing flood
protection facility.
Special Requirement No. I1 — Geotechnical Analvsrs and Report.
Response: This development does not propose any ponds or infiltration.
Special Requirement No. 12—Soils Analysis and Report.
Response: The USDA-SCS Soil survey shows the site to have Indianola loamy fine sand
on 4- to I S-percent slopes (InC). The sandy appearance of the soil surface at the project
property is consistent with this type of soil.
2.3 City of Reaton Conditions of Approval/SEPA
The Hearing Examiner's Report and Decision is included below:
I 2653.004.doc
July 2,2007
OFFICE OF THE HEARING E�i;ANIINER
CITY OF RENTON
1'Iinutes
APPLICANT/CONTACT: Alexia Dorsch
Barghausen Consulting Engineers, Inc.
18215 72°d Ave S
Kent,WA 98032
OWNERS: Camie Ng
1530 33`�Ave S
Seattle,WA 98144
Renton Properties Short Piat
��
LUA-07-043,SHPL-H
�;,'
LQCATION: 2132 Harrington Place NE
SLTMMARY OF REQUEST: Hearing Examiner Short Plat approval for the development of a
6-lot subdivision of 2 parcels of land totaling approximately
41,995 sf.
SiJ1VIl1�fARY OF ACTION: Development Services Recommendation: Approve subject ta �
conditions
DEVELOPMENT SERVICES REPORT: The Development Services Report was received by the
Examiner on June 19,2007.
PUBLIC HEARING: After reviewing the Development Services Report,examining
available information on file with the application,field
chec2dng the property and surrocmding area; the Examiner
conducted a public hearing on the subject as follows:
11�IINUTES
The following minutes are a summary of the June 26,2007 hearing.
The legal record is recorded on CD.
The hearing opened on Tuesday,June 26,2007,at 9:02 a.m. in the Council Chambers on the seventh floor of the
Renton City Hail. Parties wishing to testify were aff'irmed by the Examiner.
T'he following exhibits were entered into the record:
Ezhibit No. l: Yellow file containing the ariginal Exhibit No.2: Vicinity Map
application,proof of posting,proof of pubtication and
other documentation ' ent to this r uest. "
Ex�clbft No.3: Aerial Photo h Eahibit No.4: Zonin Ma
E�ibit No. 5: Prelimin Short Plat Exhibit No.6: Slo Anal sis Ma
Eghibit No.7: Prelimin Tree Retention Plan Eahibit No. 8: Prelimi Landsca e Plantin Plan
Renton Properties Short Plat
File No.: LUA-07-043, SHPL-H,
July 2, 2007
Page 2
Exhibit Na.9: Setbacks Plan
The hearing opened with a presentation of the staffreport by Etizabeth Higgins, Senior Planner,Development
Services, City of Renton, I055 S Grady Way,Renton,Washington 98055. The project is located in northeast
Renton in an area that is generaliy developed with single-family residences. Hyde Park Condominiums are
located to the east. The proposal is to combine two lots and subdivide them into six new lots and one access
tract to the west that would be dedicated for street improvements. The property to the north,west and south is
zoned R-8,the same as the subject property,east is zoned R-10.
The properiy currently has a single-family residence on it, which would be removed prior to recording of the
final plat.
The 61ots have an average size of approximately b,000 square feet each, the total area is 35,828 square feet.
Following deducrions a net density arrives at 7.30 dwelling units per acre,which is within the ailowed range of
the R-8 zone. The east property boundary has some steep slopes,they are within the setback area of Lot 4,it
will not be an issue for this subdivision.
The property�is covered with mature vegetation and where possible these trees would be retained. A landscape
plan has been submitted showing the landscaping that has been planned for the abutting right-of-way,
The project meets the objectives and policies of the Comprehensive Plan Designation in the Land Use Element
and Community Design Element. This project wilt be denser than the szurounding properties,however,the two
lots in the back will be screened by the four lots in the front thereby decreasing the impact on the area, The
project f�n-ther meets the development standards of the R-8 zone in terms of Density and Lot Dimensions. There
are some setbacks that wi11 need to be adjusted. Some setbacks were shown to be larger than actually needed,
front setbacks are required to be only 15-feet far primary shucture and 20-feet for attached garage. The side
setback along the side abutting the private access easement must be 15-feet from the edge of the access tract,it
has been suggested that the property line be shifted to the east.
Compliance with the buitding standards will be verified prior to the issuance of building permits.
All lots comply with the Subdivision Regulations with regards to Lot Amangement,Size, Shape, and Orientation
of the lots. The Boundaries are reasonable,the access is good for projects with lots in back.
This project was exempt from Environmental Review,however,as a condition of approval,Traffic,Fire and
Parks Mitigation Fees will be required.
Tom Bar h�ausen, 18215 72°�Ave S,Kent,WA 98032 stated that the private tract made more sense than private ',
easemen� With a private trac�,the two properties that benefit from the access are actually responsible for the ,
maintenance and ownership purposes. Those owners have ownerslup and are responsible for the upkeep and I
maintenance of the tract.
They do intend to make a shift between Lots 5 and 6,from the i 10 feet for those two lots,they intend to shift the
line between the two lots by 6-feet,maldng Lot 5 60-feet wide and Lot 6 50-feet wide.
Jane Keesecker,2124 Harrington Place NE,Renton,WA stated that she was the owner of the small cutout
section southwest of this projec� She was surprised as to how nice the plans for this project were. Her major
concems include fencing around her property,curbing and sidewalks where will they be placed. She had
Renton Properties Short Plat
File No.: LUA-07-043, SHPL-H,
July 2, 2007
Page 3
concerns regarding the dedicated ROW that is going to be 20-feet while their property has a 30-foot ROW,how
will that affect their property. She wondered why they could not get some of their property back as well.
Elizabeth Hig i�ns stated that the original submission showed a 20-foot ROW,however that was an error and it
has been corrected to show a 30-foot ROW along NE 21�Street.
Kavren Kittrick,Development Services stated code requirements state that the road must be improved out to
Harrington so that the properties can use the road as a�access. It must be fire safe(a minimum of 20-feet wide
pavement). The"Fee in Lieu of'portion of the code may be applied for by this developer, they can pay the City
the amount of money that it would cosi the City to put in improvements sometime in the future. If a developer
were to re-develop a large section,then the City would take money from that fund and start filling in the area. If
&ontage improvements were to be put in now,it could disturb the storm drainage that is worlang in that area.
Mr. Barghausen offered to build a 6-foot solid wood fence on two sides of the Keesecker properiy.
The Examiner called for further testimony regarding ttiis project. There was no one else wishing to speak, and
no fiuther comments from staff. The hearing closed at 9:41 a.m.
FINDINGS. CONCLUSIQNS&RECOMMENDATION
Having reviewed the record in this matter,the Examiner now makes and enters the following:
FINDINGS:
1. The applicant,Alexia Dorsch of Barghausen Consulting Engineers,Inc., filed a request for a Short PIat
approval.
2. The yellow file containing the staff report,the State Environmental Policy Act(SEPA)documentation
and other pertinent materials was entered into the record as Exhibit#1.
3. The Environmental Review Committee(ERG�,the City's responsible o�ciat determined that the
proposal is exempt&om environmental review.
4. The subject proposal was reviewed by all departments with an interest in the matter.
5. The subject site is located at 2132 Harrington Place NE. The subject site is located on the east side of
Harrington Place and north of NE 21 st Street as extended.
6. The map element of the Comprehensive Plan designates the area in which the subject site is located as
suitable for the development of detached sirtgle-family homes,but does not mandate such dcvelopment
without consideration of other policies of the Plan.
7. The subject site is currently wned R-8 (Single Family-8 dwelling units/acre).
8. The sabject site was annexed to the City with the adoption of Ordinance 1796 enacted in October 1959.
9. The subject site consists of h�vo adjoining parcels that total 0.9b acres. One pazcel is 0.31 acres while
the second parcel is 0.65 acres. 'The two parcels combined are L-shaped. The subject site is
approximately 281 feet deep(east to west)and approximately 218 feet wide. The frontage along
Harrington is 108 feet long while the frontage on what will be the extension of NE 21st is 130 feet long.
_ Renton Properties Short Plat
File No.: LUA-07-043, SHPL-H,
July 2, 20fl7
Page 4
1 Q. The proposal wouid combine the pazcels and re-divide them into six(6)lots and two tracts. One tract
would be an access roadway for interior lots while the second tract would actually be dedicated for the
extension of NE 21 st Street to the eastern edge of the plat
11. The subject site has a slope of approximately 13 percent generalIy but drops steepty near its northeast
corner. The 13 percent grade is not regulated but the slope along the east is regulated but staff noted
that the slope falls in a setback area that would not be developed or disturbed.
12. An existing home is located on the western third of the subject site and would be removed if the plat is
approved.
13. The easteFn two-thirds of the subject site is heavily wooded and a survey found 85 sigiificant trees. Thc
Director determined tiiat 25%of those trees much be retained. The applicant agreed to retain 29%of
those trees. In addition,code requires two trees to be planted in the front yards of the new lots.
14. The applicant proposes creating six lots. Proposed Lofis t and 2 would be located on and accessed from
Harrington. Proposed Lots 5 and 6 would be located on and accessed from NE 21 st Street. Proposed
Lots 3 and 4 would be interior lots. These two Iots would be accessed from Tract B,a private tract that
would enter the site from NE 21 st Street.
I 5. Staff noted that a side yard street setback would be required for Proposed Lot 5 adjacent to Tract B.
Staff suggested that its common lot line with Proposed Lot 6 be shifted eastward to accommodate a
buildable lot and appropriate side yard setback. The applicant agreed it would be appropriate.
Appropriate setbacks will also be required on Proposed Lots 3 and 4 from the access tract.
16. As noted, the new Iots will be accessed from Harrington and NE 21st. NE 21 st Street will terminate
neaz the east property line of the subj ect site since a steep slope east of that location would prevent its
extension eastward. A private extension of Jefferson Avenue NE runs north to south just east of the
subject site but does directly abut the subject site. In addition,a steep sIope separates the subject site
from that private right-of-way. Staff has recommended that no access be pernnitted to the east from
Proposed Lots 4 and 6.
17. The density for the plat would be 7.3 dwelling units per acre after subtracting roadways.
18. The subject site is located within the Renton School District. The project is expected to generate
approximately 3 school age children. These students would be spread across the grades and would be
assigned on a space avaiiable basis.
19. The development will increase traffic approximately 10 trips per unit or approximately 50 new trips far
the five new single-family homes. Approximately ten percent of the trips,or approximately 5 additional
peak hour hips will be generated in the moming and everiing.
20. Stormwater systems are located in Harrington. The analysis required by the City shows the site is
exempt from detention requirements. Stormwater would be tightlined to the existing system but if the
soils are suitable, infiltration may be used.
21. Sewer and wa.ter will be provided by the City. Hookup and special district fees are applicable to this
development.
Renton Properties Short Plat
File No.: LUA-47-043, SHPL-H,
July 2, 2007
Page 5 �
22. The applicant agreed to provide a fence along its southern and western property Iines ta benefit the
neighboring property owner. The fence will be subject to City review to assure it does not interfere with
sight lines for those on the streets or using the driveways.
23. The City has adopted mitigation fees for transportation improvements, fire services and parks and
recreational needs based on an analysis of the needs and costs of#hose services. These fees are applied
to new development to help offset the impacts new homes and residents have on the existing community
and the additional demand for services.
CONCLUSIONS:
1. The proposed Short Plat appears to serve the public use and interest. The subdivision wiil create five
new building Iots for detached single-far�ily homes in kPeping with both the zoning and comprehensive
� plan for this area.
2. The redevelopment of the subj ect site will increase the tax base of the City and heip offset some of the
impacts of the new development. The City has identified specific services that the City provides that are
additional,affected by new development, The development will increase the demands on the City's
parks,roads and emergency services. The applicant shall therefore help offset those impacts by
, providing mitigation that matches the fees established by the City.
3. The proposed lots are in the main rectangle with two lots slightly skewed to allow an access tract to gain
entry to interior portions of the lot. The creation of a separate access tract will clarify ownership and
maintenance responsibilities fQr the access.
4. The applicant will be preserving the steeper slopes on the site since they will be incorporated into a rear
yard setback. The applicant also proposes preserving more than two dozen of the significant trees found
on the site while adding new trees to the front yard azeas as required by Code.
5. The applicant will have to provide appropriate setbacks from access roads and may shiR a lot line as
required to provide appropriate iot size or setbacks.
6. In conclusion, the proposed short appears reasonable and is approved.
DECISION:
The Short Plat is approved subject to the following conditions:
1. The existing structure,including the atta.ched garage,must be removed or demolished prior to
the recording of the plat.
2. The applicant shall pay a Transportation Mitigation Fee based on$75.00 per net new average
daily trip attributed to the project.The fee is payable grior to the recording of the plat
3. A Temporary Erosion and Sedimentation Control Plan(TESCP)shall be required. The TESCP
shall be designed pursuant to the Deparhnent of Ecology's Erosion and Sediment Control
Requirements outlined in Votume II of the most recent Department of Ecology Stormwater
Management Manual.This condition shall be subject to the review and approval of the
Development Services Division.
Renton Properties Short Plat
File No.: LUA-07-043, SHPL-H,
July 2, 2007
Page 6
4. A Fire Mitigation Fee,based on$488.00 per new single-family structtire,shall be payable prior
to the recording of the plat.
5. A Parks Mitigation Fee of�530.76 per each new singie-family residence shall be payable prior
to the recording of the plat.
6. The face of the plat shall contain language that prohibits any access to the east from Proposed
Lots 4 and 6.
ORDERED THLS 2°�day of July 2007
� j
r-x�a.r.��
HEARING INER
TRANSMTTTED THIS 2"�day of JuIy 2007 to the parties of record:
Eiizabeth Higgins Alexia Dorsch Tom Bazghausen
1055 S Grady Way Barghausen Consulhng Engineers,Inc Barghausen Consulting Engineers, Inc I
Renton,WA 98055 18215 72°d Ave S 18215 72°�Ave S �
Kent,WA 98032 Kent,WA 98032
Jane Keesecker
2124 Harrington Place NE Camie Ng Suzette Cuizon
Renton,WA 98056 1530 33`�Ave S 2200 Harrington Place NE
Seattle,WA 98144 Renton,WA 98456
Don Cochran
2132 Hazrington Place NE Elizabeth Rogers
Renton,WA 98056 2300 Jeffeison Ave NE Ste.B-108
Renton,WA 48456
TRANSMITTED THIS 2"d day of July 2007 to the following:
Mayor Kathy Keolker Mark Peterson,Fire
Jay Covington,Chief Administrative Officer T.,arry Mecicling,Building Official
Julia Medzegian,Council Liaison Planning Commission
Grregg Zimmerman,PBPW Administrator Transportation Division
Alex Pietsch,Economic Devetopment Utilities Division
Jennifer Henning,Development Services Neil Watts,Development Services
Stacy Tucker,Development Services 7anet Conklin,Development Se�rvvices
Renton Reporter
Pursuant to Title N,Chapter 8, Section 100Gof the City's Code, repuest for reconsideratiom m�st be filed in
writing on or before 5:00 p.m..3ulv 16,2007. Any aggrieved person feeting that the decision of the Examiner
is ambiguous or based on erroneous procedure, errors of law or fact,error in judgment,or the discovery of new
evidence which could not be reasonably available at the prior hearing may make a written request for a review
Renton Praperties Short Piat
File No.: LUA-07-043, SHPL-H,
July 2, 2007
Page 7
by the Examiner within fourteen(14)days from the date of the Examiner's decision. This request shall set forth
the specific ambiguities or errors discovered by such appellant,and the Examiner may,after review of the
record,take further action as he deems proper.
An appeal to the City Council is governed by Title N,Chapter 8, Section 110,which requires that such appeal
be filed with the City Clerk, accompanying a filing fee of$75.00 and meeting other specified requirements. I
Copies of this ordinance are available for inspection or purchase in the Finance Department, first floor of City ;
Hall. An anneal must be filed in writin�o�or before 5:00 p.m.,Julv 16,2U07. i
If the Examiner's Recommeudation or Decision contains the requirement for Restrictive Covenants,the
executed Covenants will be repuired prior to anproval bv City Council or final processing of the fiEe, You
may contact this o#'�ce for information on formatting covenants. ,
The Appearance of Fairness Docirine provides that no ex parte(private one-on-one)communications may occur '
concerning pending land use decisions. This means that parties to a land use decision may not communicate in
private with any decision-maker concerning the proposai. Decision-makers in the land use process inclt�de both
the Hearing Exaininer and members of the City Council.
All communicarions conceming the proposal must be made in public. This public communication petmits all
interested parties to lrnow the contents of the communication and would allow them to openly rebut Lhe
evidence. Any violation of this doctrine would resutt in the invalidation of the request by thc Court.
'The Doctrine applies not anty to the initial public hearing but to all Requests for Reconsideration as well as
Appeals to the City Council.
, l
�
City of Renton
PUBL1 C Department of Planning/Building/Public Works
HEARING pRELIMINARY REPORT TO TNE HEARING EXAMINER
A. SUMMARYAND PURPOSE�F REQUEST:
Public Hearing Date: June 26, 2007
. Project Name: Renton Properties Short Plat
Owners: Camie Ng
1530—33�d Ave S
Seattle WA 98144
Applicant/Contact: Alexia Dorsch
Barghausen Consulting Engineers, Inc.
98215—72"�Ave S
Kent WA 98032
File Number. LUA-07-043, SHPE.-H Project Elizabeth Higgins,
. Manager. Senior Planner
Project Summary: The applicant has requested review and appraval of a 6-lat subdivision of 2
parcels of land totaling approximately 41,995 sf. The property is zoned
Residential 8 (8 dwelling units per net ac�e). The proposed density is 7.30
du/a. An existing single-family residence would be removed prior to
redevelopment into new single-family residential structures.
Project Location: 2132 Harrington Place NE
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'� ' 3.0 OFF-SITE ANALYSIS
` 3.1 Upstream Basin Analysis ',
The eastern boundary of the project site runs along the divide between the Honey Creek Ili
�� ' subbasin and the subbasin draining to Edmonds Avenue N.E. The site is located at a �
local high point. Therefore,there is no upstream basin.
3.2 Downstream Drainage Course Analysis
N.E. 21st Street borders the site on the south and Harrington Place N.E. borders the site
on the west. The site sheetflows to N.E. 21 st Street. The existing street topography
channels the site runoff into the existing storm drain system in Hamngton Place N.E.
The 12- to 15-inch diameter concrete storm drain in Harrington Place N.E. leads north a
distance of 600 feet, where the storm sewer makes a 90-degree turn to the west, down
N.E. 23rd Place. The public storm sewer in N.E. 23rd Place continues a distance of 1,040
feet to the west, to Edmonds Avenue N.E., which is more than 0.25-mile downstream of
the site.
The Edmonds Avenue N.E. storm drain system flows northerly to the outfall system
north of N.E. 27th Street, and discharges to May Creek roughly 1,950 feet north of
N.E. 23rd Place.
Please refer to the Downstream Drainage System Table and Map,below.
12653.004.doc
FIGURE 5 -
DOWNSTREAM
D RAI NAG E SYSTE M
TABLE
OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE
Surface Water Design Manual, Core Requirement #2
F3asin: Puget Sound Subbasin Name: May Creek Subbasin Number:
Distance Observations of Field Inspector,
Drainage Component Drainage Component from Site Existing Potential Resource Reviewer,or
Symbol Type,Name,and Size Description Slope Discharge Problems Problems Resident
Conslrictions,undcr capacity,ponding,
ovcrtopping,Flooding,habitnt or
Typc: shcct flow,swalc,strcam, organism
channcl,pipc,pond;sizc, Drainagc basin,vegctation,covcr, dcstruction,scouring,b�nk sloughing, Tributary arca,likclihood of problcm,
Scc Map diamctcr,surface area dcpth,typc of scnsitivc arca,volumc % Ft. scdimcntation,incision,otlicr crosion ovcrFlow pathways,potcntial impacts
1. 12-inch diameter concrete pipe Harrington Place N.E. lU0 None Noted None Noted
2. 15-inch diameter concrete pipe Harrington Place N.E. 600 None Noted None Noted
3. 15-inch diameter concrete pipe N.E. 23rd Place 1,640 None Noted None Noted
4. Outfall pipe to May Creek Edmonds Avenue N.E. to May 3,590 None Noted Nonc Noted
Canyon Creek
I 2653.004.doc
FIGURE 6 -
DOWNSTREAM
D RAI NAG E SYSTE M MAP
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hds+l Imd pobnim ryfew udn
cvr�e�clm:m 6irt dev�fus delnni�
Z0/N V Car�Ilood wM�dult� hmid Iww
FLOOD INSURANCE RATE MAP �"'�°��'`�"�
�.�. �.� �. �,. � ,.�
— ��.� � �
FLOOOYYAY NlEAS IN ZONE AE
KING COUNTY� onaea F�000 �s I
IOI!I Nea d SOb�s/mk re�d mrea
Bood ww a�� �Mpk d lo tlnn �
WASHINGTON AND ''���'�`°��—'�°�
, ,q�.. a4 rtl a� P^� a
INCORPORATED AR,EAS ��'�"��
� o���
ZGIS Y �RY dlY�Yrd b d qdd!SOQyp
��
ZOM D Nas u wYd /ood MmN re
PANEL 668 OF 1725 �,��� ���E�
(SEE MAP IN�EX FOR PANELS NOT PHINTED)
� � � �
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isst isso Ra�ocrd� '
CaWJ b�rir anu nwmapv�oobe wiFln a aq�ew m Syar1M
FleoJ N�sld ArNt�
FIooA Bau�y
CONTAINS:
COMMUNfTY NUMBER PANEL SUFFIX ��
- - �.°°w''^'
� � �� �
� �.. .d �,�
KING COUHTY, oMerw a.. d pe.+�
UrNNCORPORATED AF�AS 530011 OBBB F co.w aw iwea es�rb.
RENTON.CfTY OF a� 0868 F w""�" � poo0 �i°
�
e«. a�a e..w� u�«
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ta Eratlan orun.
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•� fliYw IiM�
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NOTES
TAi�ui u�a uw in+6r�aemi tlw NI�oIYI FboC wwriC�f/op�n:
MAP NUMBER �°����tl�..�b��,,�
bd 6Wp�wm d ard a.w aN P�+�1s1uw aaid�
Sy�dtl Rood MmiE!wi
53033C0668 f `°�""'�"�°'"�""�'`"�'°d°°�°.�°�°"°'
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�,�Y,�,� MAP REVISED• ,���,,,,�,m
�.�,..�������,..�a�a
��G MAY 16 1995 � d �
,� r hi.na..n ewM..� o�m ��a,..°n��n��w..a�
w n�a.uk �.mua. wnn �.sb m naa.�,«o ar ,n. s.aw
�aMrv�sw��ro�x
Flme+�+r�n M rer�a w me w�mv m aiew a aoi..
N
RooMe� wid�M r� pu"id�1 in M ihod Inauw�w SnM' R�part
��yo o TAs rruP mp inearyoeb nVOmi�W Eaa�'s af CaM1Y Bni�
. RNama SyaMn lhi4 wd/w ORrn�iM FM�CY! Ars� wlWM
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Capuw�IMwb a1ur�r�an�t a d tM bb d 1A's m4 7M ur
YaJE miMsl ppApW a^^vw'/af/ir b GOwiw i wrynM�
Fcderal Emergency Management Agency "�° "�° �° � 0 M � d ~ �
w,�.�v��w�v v�«m�.�.w.o ,« ,
s.mon aa a s»roea xi.nraie.se�er Mpen. '�.
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M4 Ydec
MM REPOSITORY
Rdar m Repwi[aY Listin9 on MaP InOmc
EfFECTNE OATE OF
COUN7WNDE FLAOD INSURANCE RATE MAP: ',
s�fEAiFn 18.W� �i
EFFECTNE OATEIS]OF REVSION(SITO TNiS PANEL�
R�:Idd t.Yy M.1Bi6 to ipd�e�my ionruc
�G;;�s� CAMIE NG SHORT PLAT FEMA LEGEND
m z 2132 HARRINGTON PLACE N.E.
:`�,t,,W`�,z RENTON, WASHINGTON
�a.,,o��• (BCEJOB#12653)
FU20005U26531e#��brt112653fema egend.ccir
FIGURE 13 - SENSITIVE
AREAS MAP
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� Selected Parcels '-i� Mo��Rar[ '
,.::
z_:�
I-� County Boundary SEVERE
;� Mountaln Peaks � Sole Saurce Aquifer
CAO 5ho�eline Conditlan � SAO Wetland
il a;gh ';;, 5A0 Lantfslide
l�
�f �u.d;�.n � �'�� SAO Caal Mine '
r•,.' �aw � 5A0 Seismic �
Highways SAO Erasion
�f Incorporated Area � Chinaok Distribution
Streets ■ 5ensitive Area Natice on ,
Title
il�gh'µty
A�� i Drainage Complaints
��� Areas 5usceptable to
G roundwate r
Parcels Contaminatian
,�J Agricultural Waterways
�T � LbN
Wildlife Network
SAO Stream M��m
:'`.- ���yh
� C lass 1
S1NDM Landslide Hazards
� C Liss 2 Poron n iai
� Ctass 2 SaYnanid L�ndsNdo Il�rd
L�ndsfida N�ard Dramago
,,,f` C t�ss 3
. uncass�r�oa CAO Basin Condition
DLakes and Large Rivers �� ��'��
' Matium
,ti,,` Streams �
� Flaodway n �O�~
�'"`�'; 100 Year Floodplain
1
Channel Migration Haza�d
Areas
'�
¢G"A�s CAMIE NG SHORT PLAT SENSITIVE AREAS LEGEND
� m� �
m � - � 2132 HARRINGTON PLACE N,E.
� == �
:� �.��► .= RENTON, WASHINGTON
`'�a.�a���`� (BCE JOB#12653)
P,`,12000sU2653\exh'trit\12653 senyfive ar�s!egend.cdr
4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN
4.1 Flow Control Analysis and Design
The site is located in the May Creek Basin, and drains to May Creek via the
Edmonds Avenue N.E. storm drain system, and the outfall system north of
Edmonds Avenue N.E. and N.E. 27th Street.
We calculated that the 100-year peak flow for the existing site runoff in accordance with
the SBUH method is 0.07 cfs for the 24-hour, 100-year event. We delineated the existing
site into impervious area, lawn, and forest. The CN numbers for the runoff calculation
are for hydrologic soil type"A", and are tabulated below.
We intend to apply the peak flow exemption in accordance with the 1990 King County,
Washington KCSWDM, and limit the 100-year peak flow increase to less than 0.50 cfs.
We found that a developed area distribution with 0.43acres of impervious areas and
0.44 acre of landscaping has a 24-hour, 100-year peak flow of 0.43 cfs, again using the
SBUH single event method. We shall limit the impervious areas in developed conditions
to 49 percent, equaling 0.43 acres. We summarized the results in Table 4.1.1 below.
Table 4.1.1 —Site Areas and 100-year Peaks
EXISTING DEVELOPED
TOTAL: 0.87 acre CN
IMPERVIOUS.(acres) 98 0.08 0.45
GRASS(acres) 68 0.28 �.42
FOREST(acres) 42 0.51 0.00
TOTAL(acres) 0.87 0.87
100-YEAR FLOW(cfs) 0.07 0.45
Table 4.1.2—Total Point of Compliance Basin
Areas and 100-Year Peaks
EXISTING DEVELOPED
TOTAL: 1.76 acres CN
IMPERVIOUS(acres) 98 0.45 0.89
GRASS(acres) 68 0.71 0.87
FOREST(acres) 42 0.60 0.00
TOTAL(acres) 1.76 1.76
100-YEAR FLOW(cfs) 0.40 0.89
As we propose to pave 2,930 square feet of the public right-of-way, we included a peak
flow analysis for the drainage basin that includes the site and the right-of-way area along
the site frontage, and the residential lot that is encompassed by these areas. Please refer
to the basin area maps below. As the stormwater drains north along Harrington Place
N.E., the point of compliance (POC) is in Harrington Place N.E., opposite the northwest
property comer. Table 4.1.2 above shows that the 100-year peak flow increase at the
12653.00�}.doc
� ,
POC meets the flow control threshold of 0.50 cfs for a peak flow exemption from a
stormwater detention facility.
We based the runoff peak flow analysis on a maximum allowable roof area of
2,450 square feet per lot. In order to reduce increases in runoff we propose to utilize
limited roof infiltration with splash block overflows per civil plans and as described
below. The construction of two roof infiltration dry-wells per lot shall be a home-builder
item.
4.1.1 Small Site Flow Control BMP's
We propose to specify individual roof infiltration dry-wells to mitigate minor increases in
runoff. The dry wells shall be 8 ft. in diameter, filled with 1-1/2"to 3"washed drain
rock, and wrapped in filter fabric. As the SCS Soil Type is "InC", Indianola loamy fine
sand, the volume design requirement is 230 cubic feet, including rocks,per every 1000
square feet of tributary roof area. This is in accordance with the 2005 KCSWDM Small
Project Drainage Requirements, Appendix C, section C.23.
We will design for a 3000 sf roof per each lot:
Thus, if per each roof we design 2 dry-wells, then each dry-well shall hold 1.5 x 230 cf=
345 cf.
Dry-well bottom area: 16Pi sf =50.265 sf. far an 8' diameter dry-well
Required storage depth=345 cf/50.265 sf=7 ft.
4.2 Water Quality Analysis and Design
As the total new impervious area subject to vehicular use is 4,944 square feet, being less
than 5,000 square feet, water quality treatment of runoff will not be required in
accordance with the 1990 KCWSWDM. The paragraph below describes the pavement
counted towards new Pollutant Generating Impervious Surface(PGIS).
We propose to pave 2,680 square feet in the N.E. 21st Street right-of-way, which is
included in the increase of the off-site road and driveway area. The new pavement
overlays 1,320 square feet of this area of existing compacted gravel. We also propose to
pave 2,264 square feet within Tract A, the access tract to Lots 3 and 4. Thus, the total
', ;
proposed asphalt paving amounts to 4,944 square feet.
�
12653.004.doc
oogTHo ooeort�oNe e�neN�
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? C�1MIE NG PROPERTY �" � ' �
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SITE AREAS: OFF-SITE AREAS: TOTAL BASIN AREAS: „��� �
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LANDSCAPING 0.28 AC. IANDSCAPING 0.43 AC. LANDSCAPING 0.71 AC. g�V� � �
�a.,. e
' R�OF & DWY. 0.08 AC. ROOF 0.04 AC. IMPERVIOUS 0.45 AC. �`+, a
► ��i � �
RDA� 8C ���5 0.33 AC. _ • J � �
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FORESTED 0.51 AC. FORESTED 0.09 AC. FORESTED 0.60 AC. °°"'J 's
9
TOTAL 0.87 AC. TOTAL 0.89 AC. TOTAL 1.76 AC. � � �
� � � �
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�
CAMIE NG PROPERTY �
A POFiT10IV OF'1}�E NW 1/4 OF SECT1pN 4,TOWNBFP 23 N,RANC9E 5 E.WM � �
Fl�lf'01�WA8�47'ON
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� \ �;: � ; ; • �•�'� . .......................
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. � -• .�..t. \ �
� ( � �� ; ' � ..."......:,, • , .
...
.
� � � 1 '� ......._.. .,.,:--_�� ; ._......_,� •\,. �\` � a �
l .��. r - -� . , � � ......... \� �� � 3
� I t r � ` �ryp ....'-•"••' ................ P � � Q � 3
l � ' 1 '' `� ..
' 1 � � . . � � �� � F � �
�;�� � � � f ,� � � � � ,q � g
:'�;' j � � i d � \� �S
S�1F -0.$7AC. �
; � , � TR.A � � , _
F " � I p�� �
tI��l � � f � � � i /�1 a
� � �05 SF. � �� ; �ti ,� �
IRO°F � � ' � '1
� � ......
� ` � . � .._.._. ....... �E+R y!!
1 � I � \............ ........... .. ..�
� � � ' ........ y4 .,
. .. .
........ .
4 y
�'(D � � �' �`+ p�•�
/ .. - , � �� QQQ S� ���R�
9 -- ''�'��� o ��o -
�
+ � � ��;�:'.� `. ��5 �'�5'' o
a a / '..�: ' ; � g 620 � o
�� � /� ,?I70.SF. � �p� `� � �o pa�u __ � �
__ > a � , , � � ..
^ ^ – � � ,�i � �yl �
' � .:. - . – . _ _ _ • : : : '
� 1 �� 1i,000 SF.DC. + DWY'S � Q�% '� ' �
` �. 1 � 60% � 5. ��� � \ 0.02 AC. � � � '� � �
0 0 0'0 ��r '--:_- - . ` ` EX.ROAD &
'_ • ' ,i.�t:ir r��� . / �. � � � � �
' L. ,�h . ��d --) ..i:.
�� 1 . • ' ' .. • ` ` Q
1 ��
1 ; � �
! 1 � f ' . x
� � � � �
_ � -
��ry ^
pppH� Q
$p�try'Oml �y 7G
SITE AREAS: OFF-SITE AREAS: TOTAL BASIN AREAS: ��N� �
PRUPOSED PAVI�IG-t320 SF. �� '"� .€
LANDSCAPING 0.44 AC. LANDSCAPiNG 0.43 AC. LANDSCAPING 0.87 AC. ��'= � ;
a
DRIVEWAYS fl.09 AC. R00� 0.05 AC. PROPOSED PAVINQ-740 SF. '�.; g
���bJ�s �
ROOFS 0.34 AC. ROAD & DWY'S 0.41 AC. iMPERVIQUS 0.89 AC. _ � ` ` -�r� rv
(MAX 2450 SF EACH) �6►�0�„ �
9
TOTAL 0.87 AC. TOTAL 0.89 AC. TOTAL 1.76 AC. � h �
� � � �
d
�
3.?.1 RATIONAf_M[:THOD
FIGURE 3.2.I.D 100-YF.AR 24-HUUR ISOYLUV[ALS
3�� ��� � ��� ���. ��� ��..� �� �� 1 COUF�Y
3� i -..e.r �l. m�< r_ ✓� N, CVVNfv
� 'Yar �R
a�� � `' 7 � � -
� - __ :_.�; .:�:
3 j 3S -- �� ° - V ;Y
39 8 ;...,« � � - _ _
�v ` J
4p : �.� ,
�r = _ ,. � ��r - -
���. � � '�. �!� . :o '�}�� �. :f—� . . .
4 ��, ., "'1 m �i" . \ - �`
•�? � S - �
ST \ ' � � _.�
�� �,��� .,. f.j
�1 ; � ' ; -
� � � � -� �
.s ,.� ;
��" --, :a�- m
sr f � f ��e . � - � � - --
.a' � - , ;_n < ,, •
- � '1; -
< ; � � �
...... � � � ��� �
+ 5 �- �� ,�`-r m
.t � ! ; �
;� r� � :� Q
� �. -
1 `� '
� ; - -�{ � :� a..-- -�
) � --'�;� �� �o _ c,
� i � ;-- — V�` �: - = _
r rr �°?� `. - .� __�,� -
� �' f„��' Q . - 1� �- - :} - .�
m � _ ��
".i: Y.�. Q �
.\ � . O
� �, � "
.� y� ` o- .. - . -
� ,r. � ,
� i�,_� - o
��:��T�� ���� 'K C COVMTY
P�� CE GOVNTY �
WESTERN �° `� � '��
_, .
�-
, .
KtNG COUNTY � - � `` �5
r __ -. s.a
_. . . .
a. �. � ��
N 0�• �, ' r�' _-_ . 5.5
,
100-Year 24-Hour °� �,'� �,� � �
�,. � ,r ,
Precipitation �,, o --, ,_�,`_ ,
in Inches 0 2�4Miles y. }
hh
Z00�Surfacc Water Dcsign Manual 1/24�2005
3-17
KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL
(21 CN values can be area weighted when they apply to pervious areas of similar CN's (within 20
CN points). However, high CN areas should not be combined with low CN areas (unless the
low CN areas are less than 15% of the subbasin). In this case, separate hydrographs should be
gonerated and summed to form one hydrograph.
FIGURE 3.SZA HYDROLOGIC SOIL CROUP OF THE SOILS IN KING COUNTY
HYDROLOGIC HYDROLOGIC
SOIL GROUP GROUP• SOIL GROUP GROUP•
Alderwood C Orcas Peat D
Arents, Alderwood Material C Oridia D
Arents. Eve�ett Material B Ovall C
Beausite C Pilchuck C
Bellingham D Puget D
Briscot D Puyallup 6
Buckley 0 Ragnar 8
Coastal Beaches VariaWe Renton D
Earimont Silt Loam 0 Riverwash Variable
Edgewick C Salal C
Everett /�[� 'Sammamish D
Indianola �A] Seattle . D
Kitsap �� Shacar D
Klaus C Si Silt C
Mbced A�Iwial Land Variable Snohomish D
Neilton A Sultan C
Newberg B Tukwila D
Nooksack C Urba� Varfabte
Normal Sandy Loam D Woodinville D
HYDROLOGIC SOIL GROUP CLASSIFICATIONS
O (Low runoff potential). So�s having h(gh infdtration rates, even when thoroughly wetted, and consisting
chiefly o(deep, well-to-excessively drained sands or gravels. These soils have a high rate of water
transmission.
B. (Moderately low runoff potential). Soils having moderate infdtration rates when thoroughly wetted, and
consisti�g chie8y of moderately fine to moderately coarse textures. 7hese soils have a moderate rate ot
water transmission.
C. (Moderately high runoH potentiai). So�s having slow Infiltration rates when thwoughly wetted, and
consisting chiefly of soils with a layer that impedes dowrnvard movement of water, or sops with moderately
fine to(ine textures. These so�s have a slow rate of water transmission.
D. (High runoft potential). Soils having very slow infiltration rates when.thoroughly wetted and consisting
chie8y of cfay so0s with a high swelling potential, sols with a permanent high water tade, so�ls with a
hardpan or day layer at or near the surface, and shallow so�s over nearly lmpenrious material. These soils
have a very slow rate oi water transmission.
• From SCS,TR-55, Second Edition,June 1986, Exhibit A-t. Revisio�s made irom SCS, So0 Interpretatbn
Record, Form �5, September 1988.
� 3.5.2-2 i]/92
KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL
TABLE 3.5.2I3 SCS �i'ESTERN WASHINGTON RUNOFF CURVE NUMBERS
SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Published by SCS in 1982)
Runoff curve �umbers for selected agricultural, suburban and urban land use for Type t A
rainfall distribution, 24-hour storm duration.
CURVE NUMBERS BY
HYD LOGIC SOIL GROUP
LAND USE DESCRIPTION A B C D
Cuitivated land(t): winter condition 86 91 94 95
Mountain open areas: low growing brush and grasslands 74 82 89 92
Meadow or pasture: 65 78 85 89
Wood or forest land: undisturbed or older second growth 42 64 76 81
Wood or forest land: young second growth or brush 72 8t �
Orchard: with cover crop 8� 88 92 94
Open spaces, lawns, parks, golf courses, cemeteries,
landscaping.
good condition: grass cover on 75�
or more of the area O 80 86 90
fair condition: grass cover on 50�
to 75°k of the area 77 85 90 92
Gravel roads and parking lots 6 85 89 91
Dirt roads and parking lots 2 82 87 89
Impervious surfaces, pavement, roofs, etc. 98 98 98
Open water bodies: lakes, wetlands, ponds, etc. 100 100 100
Single Family Residential (2)
Dwelling Unit/G�oss Acre 96 Impervious (3}
1.0 DU/GA 15 Separate curve number
1.5 DU/GA 20 shall be selecled
2.0 DU/GA 25 for pervious and
2.5 DU/GA 30 impervfous portion
3.0 DU/GA 34 ot the site or basin
3.5 DU/GA 38
4.0 DU/GA 42
4.5 DU/GA 46
5.0 DU/GA 48
5.5 DU/GA 50
6.0 DU/GA 52
6.5 DU/GA �4
7.0 DU/GA 56
Planned unit developments, 96 impenrious
condominiums, apartments, must be computed
commercial business and
industrial areas.
{t) For a more detaited description of agricultural land use curve numbers refer to National Engineering
Handbook, Section 4, Hydrdogy, Chapter 9, August 1972.
(2) Assumes roof and driveway runoff is directed into street/storm system.
(3) The remaining pervious areas (lawn) are considered to be in good condition for these curve numbers.
� 3.5.2-3 i1/92
Appended on: 12:04:30 Monday,July 16, 2007
SI'I'E-EXIST Event Summary
_ - - , - --- -----._ �..�. . _..._.._. _ . .. _._...
! Event �Peak Q (cfs) Peak T (hrs);Hyd Vol{acft)IArea (ac}�Method f Rarntype
: __-----_._. _ .. __._.._----- ------ ... - --- . . __ .. . _. _ _.. . ._._ . ._.y._. . .
� 2 year � U.0351 � 8.00 � 0.0119 I; 0.8700 � SBUH jTYP�IA !
, ___ . __.,-- _ _. ; .._ ___.________ , ___ _..---_ _. �..__._.. _ _
_ _ __ .;
_._ __ _ __
1100 year� O.d709 ; 8.00 0.0472 ; 0.8700 � SBUH !TYP�IA ;
_ _. .. - - . __ _ __ � _ �
Record Id: SiTE-EXIST
.___ _ _.. - -�-- .._ - _ ..- - - ..._..____._ ___.__ _ __ ____
_ ,_ _ ..._ .__.__ _�
�Design Method ( SBUH �Rainfall type i TYPEIA �
�
. . __. _ ________---------------._.._..---._._..__.._.._.. _._._ ._ �...._ ..__ -- --� - -�--_.--;
.
--- -
____.__ I g
�Hyd Intv � 10.00 niin Peakin Factor � 484.00
�____._..__._...____.....----�._-----.___._._... _____------._.__._.___._,-------------._.----_____..._......___._.___._--. _ -
Abstrac#ion Coef'f 0.20
I �.._ ! �_._._. _. .--�--- -- --
---_.._.._.__.___._..-______.________. �
�Pervious Area 0.79 ac ;DCIA i .0.08 ac
�__.�..______------�--------------_ - -
- -� - --- � -- - -.------___�_..__.....__ . _
jPervious CN ----- ---- _.._._(_."_"_ 51.22 _____IDC CN �� 98.00 ---- k
_._ . ----------.__..___...--__._... .-�---___------� --�_....__ __---------�---_._._-------____�...._. .-�------�,.--- -----.__i
iPervious TC ` 54.67 min �DC TC ; 6.30 min �
'' _. __._._._____...---- -------._.. .__ _--- ----._..____----___... -._ __._.._....__._ _ __._..___._.__...__...T_.__I
i . .___.._.-•-•---..^._�_ �.�_-_ ._.__.___.�-----_._.---__..._..�._.___.__ ...�_.._. `----�_.-._._,_.....-----__ ._�_.�_ E
� Pervious CN Calc i�
.___..___ --. _ .___._. ...__._ _---_.__._....__. .
__._ _.__....----i�
�......._.__ _.___..__ _._..___. �---Sub cn !�
„ llescription ; SubArea
�� ...... . ....... ... ....... . . ... . .. ...... .._ .. . ._... . ..._.,_ ...._..., .. . .. ..� . ..._ .. .... .....�t
, ;� Open spaces, lawns,parks (>75% grass} : 0.28 ac ; 68.00 �E
;I_ _ _ _ Wood/fflrest tand (Undisturbed/2nd growth)- _ _ ._ ____1- 0_51 ac _._ _.!!
� ,
� 42.00 F i
_._.._. _ _ __ _ ..._. ___ ___ ...__._ ,._-- ... _ _ _. __.
._._ . �
�� Peiwious Compositcd CN (AMC 2} i 51 22 Ii
1 __ _ .._ _. _ �. _ _ --- __ _ _ _. _ _ __.. ..l!
�- ._------....._. _-- -- . .. . __ _
_ .
, _.._ _ --- . _-------- ----- - - __ --. . _. ___ _.. _. _ . ..... :,
�� 1'er�vious TC Calc ��
_ ___._.__.� ___ _ ..--- .. __.. . _ _ ,__ . . _. .., _ _. _ „
!� Type ; Description ; Length ;Slopc � Coeff , N1isc � I'T
,, _ !_ _ _... . _.. __ - ._._ _... _ __ _ _ __ . ; - _r r._ _. _
1�
;�Slicet 'Woods or forest with light underbrush.: ;40,00 ft 'S.00%'0.4040 I2'�� �9.05 inin �'
�I �0.40 I i i I'n � i i
_ ..__ _...._ ... ..___ _____ __._.__.._ _ __.__. _... _ ,__ _ ---_.. --- �
;..
__.. _ ,
Woods or forest witll light underbiush.: ` o � 2.00 �32 94 ��
�Sheet ��4� !90.00 ft �l.00/o,0.4000;.
fl
j I I � � ill] �T11I17 j 3
_.. .__..�_.__._. .. . . -- -_....._.__.....�._.._._.-------__ ;
3 -----_.---'---'-'-'-----_..._..._....-'---..�----.-�••--__..,....._._..____.._r__......_._._------..��__._.__. . _._.
'
"I Woods or forest with light underbrush.: o � 2 00 �11.82 ;
!ISheet 0.4a �50.00 ft I4.00/o�0.400U ��i min �
j _ !i
,. . . _ ---. . _ - _. .
�-___.._.._.,--�--�-------- - --------- ---------._.._._ ___...__..._------- I 110.00_.____-�-------_ . _- ------___ ___.._._,__._ i;
!�Shallow Short grass, pasture and lawns (n=0.030} I ft �4.00%�0.0300 I i0.86 min ;�
} � I
... _
� __._.____.--•----------.�__.._---_.__.._...___.____.__�---_---_--.---.------,--.___...�._..----__..__ _.__._ .._______._ _ . _..----.__..._,
�� - 54.67 j�
' Pervious TC
�
,
; min '�
; :�
. _ _ _ _ _� __ _... _
, _. ._ . . ... ___ ____ _..__._._ . . _ --- _..... -_- _:_ -._ - �_ __.. . . .__..
, . ._... - -...�.._._ _ _ __ ___.
_ _ _ _ . _. ,�
� Directly Connected CN Calc I i
�� . _ ._ _._._.__._.__._.__. _.._ ____.. _ ,.... __. _.. -- -......_..,_. _. .. __ .._.. _.... ______. ,,
.; llescription � SubArea � Sub cn (;
;,-..._._..__.__,._.... ._ ,._ ___. ._. --- --__._. _._,_..__.._,.__, �
___ ...__ . __.---- -----____ .. __---
_ .__ . .. ,---. _..._-- -�
�! Impervious surfaces (pavcments, roofs, etc) 0.08 ac 98.(� j
:.'•.._.....__.____ _..__ _-- -. ___._. ...__ __. _._ . _
�__ _ _
... � -.: _-_._ :_3�
_ �__._._._.__.___..
� ._ _._.�.__.._._...__.__ - _
� DC Co�nposited CN (AMC 2) � 98 00 j;
_--- . ._------.._-----_.._.__.__ _.. .
_ ____._. .. .__.__._
. . _ ._ . _. ._.. __..._._ _
, �_ .___ __.. _._.__._....._.___._._._. _ _:_.. .._ _.._..... ___...._._..____._._. ..___... ...._.._ _ . _. __.�__.:;.:-I
�i, ' M � ^ . �. Directly Connected TC Calc E
� _ _ _ ___._.____- -----_,.. _._.... .,.. __..., ._..__ _....-----.--.___._.. �
_.. .
I f Type j Descript�on j Length � Slope � Coeff � 119isc. � 1 T
.. ,_._. ,._ . .._ . ._ _ _ .. . . _ _ _ _.. -_ . _,_ . _ _ -- ;
'Fixcd � !6.30 n�in �I
I ,
_..__ _..._. _....__._ ._..__.__... ._ ___. ----. -- ---_._ ��
_. - -___--- ---..._ _ _,__ _...__-----
;i Directly Connected 1 C � 6 30min 'I
=___. _ ----_____-----._-_---_ . _ ._.__. __---._ ......_ _.__._.... '
_ _.__. ....__... _____...._._.__ ._______ .__.. .__.. .._._ ......_�,
Licensed to: Barghausen Engineers
Appended on: 16:15:05 Monday,November 19,2007
SITE-DEVPD Event Summary
- __ _ _ _ _ - - --- _
Event �ak Q (cfs):Peak T (hrs)'rHyd Vol (acft)'Area (ac)'Method�,Raintype
_ _._ -- -- � -
2 year : _ 0_1976___:__- 8A0 ---- -- - 0.0733 __ 0.8700 _SBUH ; TYPEIA;
100 year, 0.4485 ' 8.00 0.1774 ' 0.8700 � SBUH TYPEIA_�
Record Id: SITE-DEVPD
Design Method SBUH Rainfall type TYPEIA
Hyd Intv 10.00 min Peaking Factor 484.00
� Abstraction Coeff 0.20
- _. __.-----._.. _-- _ , ._____.. _.--_ : _ .________ _ _ __ - _
Pervious Area 0.42 ac DCIA 0.45 ac
Pervious CN 68.00 DC CN 98.00
Pervious TC j 21.33 min , DC TC ' 6.30 min �
Pervious CN Calc
Description SubArea Sub cn '
Open spaces, lawns,parks (>75% grass) 0.42 ac 68.00
Pervious Composited CN(AMC 2) 68.00
Pervious TC Calc
. . . ___ _ _ __ _ _ - ____ - -- . . . _ _ . _ _ . ,
Type Description ! Length Slope Coeff, Misc . TT
' - - -. .���
Sheet Short prairie grass and lawns.`0.15 . ;50.00 ft 4.00%�0.1500;2.00 ini 5.39 min ;
. �����
Sheet Short prairie grass and lawns.: 0.15 �80.00 ft : 1.00%� 0.1500'2.00 in 13.68 min .
Shallow Short grass, pasture and lawns(n=0.030) ' 145.00 ft' 1.00%' 0.0300��-2.26 min '
Pervious TC 21.33 min `
Directly Connected CN Calc
Description SubArea Sub cn
Impervious surfaces (pavements, roofs, etc) 0.45 ac 98.00
- - �_ _ __ . . . .._.
DC Composited CN (AMC 2) 98.00 ;
Directly Connected TC Calc
Type �Description � Length Slope Coeff Misc TT
��� - - -
Fixed 6.30 min
Directly Connected TC 6.30min
Licensed to: Barghausen �ngineers
Appended on: 11:58:56 Monday,July 16, 2007
POC-EXIST Event Summar,y
_ __._..___.__.._.___ . _...____ .__...- ----- . _ , -.- -..--
, .. . ....__ _ _ _.. ._.__..
� Event �Peak Q {cfs) Peak T (hrs}�I3yd Vol (acft) jArea (ac)�Methad Raintype;
�_.___.__ --_ _._.----.. _.___._--- --____.._ _.._ _ . . :
- ---�---. ,
.
, � 2 year � 0.1976 8.Q0 � 0.0690 � 1.7600 ! SBUH ITYPElA �
_ _ .... ..
' �l U0 yea;•I----0.3996_......_I....____8.00_._.___I � 0.1960 .__.�--1.7604 ( SBUH ITYPEI A I
Record Id: POC-EXIST
_ __ - _ _ __ .._. . __.._ . .__ ._..._ _ ___ __ ___ . _ _ _.._,. _ __
Design Method ! SBUI-I ;ltainfall type TYP�IA i
_ _ _ _ _ __ _. __ ___ __.__....
',Hyd Intv ; 10 00 min ,Pe�k,ng Facror 484 QO '
_ _.._. . . ..... _.. ..._ ._.; .-- _ .
I
. .. ,
, ; I � _ _ __ . _. .._�._..._.... . ......_ ._ _.._ _..... �. .,..._.. . ,
� E �Abstraction Coeff � 0.20 i
. .____"__'_..___....r_'_. . __..__.._._...__._. .....___.�'.___'.___.._. _..._ ..__ ._....__.._.._...._ _____. __.._._.'..._....._..___..__..�
j"_"_.__�..__...._.. ._ I
�Pervious Area i 1.31 ac IDCIA 0.45 ac
•.--__ ............ . _.._.. .___,_.___.___.__. .._._.._._._ _.._ _ .. _.__...--------__._ ___° :
,__..__._._----...__.._. _.__... .. --__... ,
;Pervious CN ( 56.U9 '.DC CN 98.00
_._ ._ ._... - - - --.. _ ..� -- �-- _. _ '
�Pervious TC � 55.i 7 min �DC TC # 6 30 min �
� __. __ ..__.____..._.._...._._._._.---..._.___.._..__.__ .___.___ - �
._ . .. ..
3 - .._ .____ _.._ _._ _.__ _�__.__�_.�_.__________..._.�_.____...__�___.,__ --- ---- �
.
-- --- ..
'� Pervious CN Calc ''
I __---------__.�_-- �----- ....__._.___ _..._ . t
---- --_ ._ _..__ . . -. __. ---, ... �
Description ; SubArea � Sub cn �,
. . - ._ - - ---_.._.__. . __._.__ _...._._..__._..._._. ........___ - - . .-- --.�_ _ . _ ... _ _._.
�I Wood/forest Iaiid (Undisturbed/2nd growih) ; 0.60 ac I 42.00
;..... ..._-....__....,. . _.._....._..""__"..____.-__'._____..__ _.__.._._.__ ....__._. _._.. _- ..___.._.. __.._........ �.._..._._...__._._�..__. . _. . .Ei
_ ...
. . _. ........_. _
!E Opcn spaces, law�is,parks (>75% ��rass) � 0.71 ac 68.00 I i
i`--------_.-----____... ___._____.._.---..__--.._-----------..---._____.____..___�._..__�_.._.__.-----------_--....--------_..:..___..._.._._..____..!�
i� _ Peivious Composited CN {AMC 2} � SbA9 '
.._ _ ... .. __----__._..__ ._._..__.._ _..__.___ ._ . - ---... _. ____._. .. .._____.._. �E
, ___..._..._..__.. ._.... - -.- - --- - .__...... _._._..._ _ _ _._ __.__.._.._ ---_ _,
..___.�_._..._ .-------.._ ___.___.___ .__..__.___--- . . . .. ... ..... . . . . .... _ _. _________.--_.__._.._,._.--- ,...
I
,� Pervious TC Calc ,;
_.._ __._ __. .. _ . __ -- - .----- _ __._ . . __ _
_.
_. . ._.. ...._._ _ _.. . ;.
;± Type � Description � Length jSlope � Coe#f i Misc � TT
___ . . _. _._.. ___ .. . _ . _ _ .. _ _ _ ___ !
. .. . __.
' !Woods or forest with libht _ _ � � .__ ;2.U0_ I
��Sl�eet �Ul�derbrush.: 0.40 �40.00 ft i5.40%'0.4U00 i�n j9.05 ini�i !
�
II ,. ___ ___- ---. ._ .. ....__.. _ _.._. ._ ____ ._.._._.. _ , ..__ _ . _ .._ .,_ ,_ _ _._..._._
1
� )� ��Woods or�oiest with (ight � ; o ; '2 00 ;32.94 `;
��Sheet j :90.U0 ft :1.00%;U.4000,. ' ; i;
ji �ui�derbrush.: U.40 : ! , ,ul �min ;;
...._.... .� ..... ... . ..... .... . .......... ... . F._... _ .. ;.... .. .0.. � . . ... . ... . .........��.. .._.._....... .... I
: ....... ............... ` k
;� �Woods or forest with libht '2 00 I11.82 �;
!IShect �ullderbrush.. 0.40 !SO.UU ft `4.OU/a 0.400U�in Im�n '�
,r _._._.. __ _.f -------.. ---- ...,___ _.. ._ . ___.. ._ ._ _.__...__. __-- --_ --- -_.. _ _ _______ ._ _I;
�i iShort grass, pasture and lawns i l 10.00 a � � ��
;�Shailow ��n=0.U3U) �ft I4.00/o p0.U3U0 i 0.86 min F(
` � 1 i ;�
_...- ---- - ----_--�_ ___.._.._._.___,_ __.._---- ---- .__.�_._....__.__ ..__. ...__.__�.__...____ �-�-- -_.;... _.---- - --__._.. - !i
jChannel ! (
�((intenn} iConcrete pipe (n=0.012) '70.00 t� �1.55%�O.0 120� I0.22 min ��
� � i
�._._�--------_-.--._., _.__-----.__�'�__{_-_____.�_..._._.__._._._.___._�._.____..._.....___._._____.._ __..--_.__._ ...----.._..._. .__--.-------.- ;
Charuiel �Concrete 2 e n-0.012 }23.OU ft 15.22%�0.0120 I �0.04 min i
�1(interm) I I
� ._....- ----.__ ---------- -----�--------_ __----------__---------�----._ ____�___._..__ ._.___....___�_._.._......_.._�..__.._...._.._..'--_...._--.._..._._'i�
'�Cliannel (� ��
l' Concrete pipe (n=0.U12) I43.Q0 ft �0.50%�0.0120 E U.24 min �
��(interm) � � �
_ _. - - � -__._.----- --._ . ._ _..:� _ ---'I
. .._...
:_.- . .._-:�..._ ___.__.. __ .. ,_._.... __ : ....__ .....__...._._....�--.._..... ... __.. _._ __ ._ --__ . _
'` � 55 17 �
�� Pervious TC (i
, � min ;;
l....... ... .... _._.__... ._......._.... ..._.__._..__.__....__.._.._......-. ._.._........__.__'- '. _.._-�-'----..____....-__----` ----.____..._._.--�--.-'_" --.."".-'_-_ ..._JE
...__.____�.__..-----'----'----'-----�------'---'-----------....-.-'.-..-------------��------------`---'--�------------'...-------
' _�_..___....__.._.�._....._._.�-'----..__..__'_".,.'_'---��..-..._._.._._..-----_-__�_..__-_..-._._____.
`(�_._.___._---�-'._��._._.._�.�_ ��
�i Directly Connected CN Cale ;;
:�----..------------�------------- __..__ --._ .._._. -..._. --- ----�-- ----._. _ _ _ _ ,_ __ . _;;
_.. . .
� Description � SubArea i Sub cn j:
_.
.---. ___.___ _____ __ _._ _..._ _.---_.___ _ .---. _..... _ _;�
__. _ ..._. - - _ ____ .
` .._ __ _ _ �
�� lmpervious surfaces (pavements, roofs, e�c} ; 0,45 ac � 98.U0 ;
f ----.. .__._.._ _ __ _- - . _ ` .
-- - -- _ _ .___ --- - --_�___. --- ------ -__ ..
;( DC Co�nposited CN (AMC 2) j 98.00
�—-- ------------------------------- ------------------�------ —--------. __-____----------------
--�. ___.__ _ __ �_- — - ..�
--- --�-------... ._.—�..._____
j f'�..""__'.____.___._._.._..__.._.-�-"'�_"'-'_ �_.__.�.._._._._._�- _�________._.___.__. _
�� Directly Connected TC Calc
.__ __...- -._. _ ._ ..._ __ _. ._ __.__
._---
�-- --
.I Type + Description � Length � Slopc I Coeff I Misc � TT
__. .._ _----_ _.. ___- ----. __ -- -- -- �- - _ ._. _ _.___�_ _ ---�-
kFixed minimum Tc 6.30 imn
, __ _ ._ _- --- --.- -__ .__- -. ._l� . ._ . . .._ .. _.._. ..... . , __ ..___.__.._... . ._.__- ___ . - -
�� D�reutly Conneeted TC 6.30min
��
Licensed to: Bar�hausen Enbineers
' I
I
�
�
i
Appended on: 11:58:11 iVlonday,July 16, 20U7
POC-DEVPD Event Summary
_ ._ ____. .__..__.._.. . ... _ __._.... ...._.......� ._. _. .. ..._ . ._. ,. . - -- __ __ _ -...
;` Event '�Peak Q (cfs)�Peak T (hrs}iHyd Vol (acft} �Area (ac);Method�Raintype
; _ _ ,._ . ..__ _. ._._ . __ ___... _.__ _ . ._.._ . . , ___ ,
j 2 yc,ar � 0.3908 � 8.OU l O.I457 j 1.7600 ; SBUH �TYPCIA �
, --._.. ----- _ _. .-- __ .___ ..___._ .,-._ .. _ _; _ ,
�10U year� 0.8886 � ^ 8.00 ; 0.3546 � 1.7600 ! SBV'H �TYPEIA '
Record Id: POC-DEVPll
_ _ _.._ _ _,_ .. _. _ _ _
jllesign Mcthod � SBUH iRainfall typc , TYP�IA i
. ._ - -- . _....___._ . . . -- -, -- ------- ._.._---...,. _._.._.. ._
..__ _-- ---... _ _ -- -
IHyd Intv � 10.00 inin �Peaking Factor � 484.40 �
�_.._..___..___..__..-___._.--.-------. ------...__.___ .._---.-.------..__.._..._.._._...__--._._ _.._..._.._____... �
_ . . .
I j----�---------.- �Abstraction Coeff � 0.2Q.------- ;
,----...___._--------------�-----;-._._.�..__._.__._�._.._.
-- .______.__..__.___._----------.------_._---_._.__..___-------...__._.__..._....._...---�
,Pervious Area i 4.87 ac �DCIA 0.89 ac
��-----�-------__��.�._____.____. _._�__�._�._;---- -----�----..__��.----- - . . _�
Perviaus CN 68.00 DC CN 98.00 �
� �
t---- __..------------_,._---�__.._.._.._..._----� --------_.__......_____----�-------- -�_.-----------�_._.._..--�
IPervious TC ( 22.59 min �DC TC f 6.30 m�n
-----_.___. _._......____.....__.---.---- ------_--....._._.____.__._.----------._._ _ __ _ -.---
�.____.:::'.::___'��'�:'"_,_'.: ___._ _---_---�---_.�.__�..__._-._-----.__ _.__.v._.._-------_ --G
i r Pervious CN Calc {
��...__._ __-------_ .____._ _ ____.___ _.._..._.__ . _ .. .-.-. -_-- - ._.._.._I;
--�-- ---- --�--------- .__.
;� Description SubArea i Sub cn �;
,,. _.. ...__._._ ._.__.__.._....--- -_ __ ---___ ._ ___ _ _-- - .-----.__ _ _ ._ _.__ _.:.._. - -.__ .__ ._ _��
--- --- �
� Open spaces, lawns,parks {>75% grass) j 0.87 ac � 68 40 I I
�, .�
_ ____ _ - . ._ _. . ____ __..._ �. __.._ .__. . - _ . _ _ _ _ - _...._. __._ __ .
'` Pervious Co3npositcd CN (AMC 2) ' 68.00 !
. _ .._ _---- .._ __ _ ... .---.. -- . . _ . _ ._. _.._. . __ _ . _. _. ._._. ,.
�� __ _-----_ .�_._ _---- ._.---- -. _.__.. __ Pcrvious TC Calc I
' '� , __ _ ;_ _. __ ._ _i' ... __.__. ,,
;!.. _ . _,_ (
- -
t� Type � Descr�ption 3 Length j Slope ; Coeff � Misc TT �
_ __..... . ......._.. __ __ .._. __.' _ . ._- - --- - -- _
. ._ .. _. � .. ._ _ _!_ �_._. ; . _ ._ .. __- - -li
�jSheet �Short pza�ric brass and lawns.: 0.I S i5Q.00 ft j4.0U%;0.1500!?'�� �5.39 mii1 :;
� � i � �'
_ . _--- ..__ _.._.--- _ ..__._ __.____ ._ .___. . __.
t �
- - -__...... ...... ._._ . ...._�. _.._. _.;
�.__.. _._ _ ! _� _ � {i
I i � I �2 00 i 3.68 ,�
�ISlieet Short prairie grass and lawns.: Q.15 80.00 ft 1.(}0%I�.1500 . ' � . I i
`� � � in �min �
,, __ ....__._-------..------. ,._._.. ._�_-------._._._...._....._.__.___ _.__ ....... ....... .._ __ . ; .
._ __._. ..
�I EShort��rass, pasture and lawns 145.00 i �f � � ��
;�Shallow � �1.00%I0.0300' 2.25 min ;:
�(n=0.030} �ft � I
r �;
I --..__.__..___.._-___----------..-- ------ ---____.._- ----�--- �-- - - - __---______�;
��Shallow �Paved i50.0a ft �4.00%�0.0100[ �0.13 min r;
� _.._..____._.._ __---._._......._.._.....--------.-._..�-----___._- ---._. --. .__.., .__.._..--- __._ _.__ ._____..._..� ._._. .__.__.__ .... ..
� Ghannel 120.00 ! � - �--_.__._ �
` (interm) Concrete pipe(n=0.412} ft f2.60%'0.0120( f 0.29 min ��
� i �
I I �
I �
.-..___.___�__-___. _._.__---------___-------__.�_._.�..__ ._..__.._-------------_._.______._.______,_�------ ---_._ _ ,
IChannel Concrete pipe (n=0.012) 37.U0 ft �3.19%�0.0120 0.08 min �
, 3 (intenn} � � ;
; __.____-.___ __. .. -- ---.--____.._.___..---.___.__________--.--.------_._._.__.-- ----.-----.,-_-_.____.___._--r__--._____.�;
'�Channel � �165.00 � ? � �
;� . Concrete pipe(n=0.012) 2.16%�OAl2U 1 I0.44 min �;
�i(interm) ft � !
_______ _ ----_.. ._. _____ -- _.... . ____.. .. ._-............ . ____ _ _ ' _.. _.�i
.- ,- __ i_.._ _....._i I
IChannel I � �
;�(intenn) EConcrcte pipe(n=Q.012) ,43.00 ft IU.50%�O.OI 20� 10.24 min !�
,_ __. _ _.__.___.____... ...._. ._. _.
_...._.... _._._. _ _._....._ --.__ . . ... _..
_._ _ _ . ._._ ...... _ _._. .. � ;
-----_�—.__-------_._.__.—..---___..--------___.__�..______�_.�.__________._._.___.�-- -. ___.__-_-----
. __.. .- � --
----__---__...---�--.._..___----�------------�---___.�.-------------_..___.__.__._ --.___—_-___..------�---- ----.__—---�----�!
Pervious TC � 22.59
.
� min �
,___---...._.__�_�.__. _____._.�---.._.-----._._.___.._-----.-.--__.__.__.__.__._.___---.--------____.._._.._.____..__._..,,
� - --.. .� _ _ -- .-- - - - �
�-_�_�.--�.-_���..=:�-___-__.-_._._____---_�:_�-_-__--==_-W:_-�__:�-_._.---_�--�__�-.�_.-�_:-_--. -���
�` Directly Connected CN Ca[c �
. .
_ . . . . . ._ . _ .. � _ .. ......._._.--- __...._._._.__.._._... �
_. _ ._ __._ . .- - - -
_ ._ -- - �- ------ ._..
E Descriptiott � SubArea , Sub cn
��_..-- ---_ -- p---- ---- ---,------�p----:--�--'-------'---__}-_.-----.._-�-��-----�____- -____;______- --._......_i�
-�-------�-------------__.______.--------�__._.----_..__._---------------______.--�--�------------..._...-----�--__________�_....
Im ervious surfaces avements roofs etc 0 89 ac 98.00 a
, i G DC Ca�nposited CN (AMC 2) ; 98.00 �i
�:._._.___. - _::
_ . . . ... __ .....__.. ... ..__ _ . _.__ __ __.. _ _ �
. _._--- .___._ ..__--___
_. ._....._. . _ _ _ . ,....::_ :: ......__- _.. _._�. _ _....._ ___:..__ : �;
��._...... . _ . _... ,
,� llirectly Connected TC Calc ;;
__-�-- _------,----- __.._.__,--.,__._...---..._._:_._..- -.._ .
•��._ _- � ---- ---- - -j- - ,
___
� Type i Descrept�on � Length � Slope i Coeff : Misc � TT �
�i . _ _ _._ __,_ _._.. _.__ _.. _____ ._ __ .. . .._ _ _ __. __ � __ .. _ .._. _- - _.__._._. ,
iFixed mu�imum Tc '
� I �6.30 min I
_ . _,_._ _. ._._._.._..... _. _ , .__�_._.. .._ . ....... .. ................. . _,._... _..._.
�� ._._...._.._......._ . . .. . . `
;� Directly Connected TC � 6.30min E
� __ . .....__ __ . ._ __ _.__ ..__.. _ .__ _. . __ _ __. _ _ . . _._ . __ ..._ __.__.. _.... ,
Licensed to: Barbhausen Engincers
5.0 CONVEYANCE ANALYSIS
As the project does not propose any new conveyance systems a conveyance analysis will not be
required. We are including a conveyance and full-flow capacity calculation for a hypothetical
12" diameter concrete pipe at minimum slope. The conveyance calculation shows the rational
method peak flow for the 25-year event, for the POC basin as described in section 4. A 12"
diameter concrete pipe is shown to have a larger capacity than the 25-year peak flow. As the
downstream pipe system is larger than 12" in diameter, we do not anticipate any downstream
capacity problems due to the site runoff increase.
12653.004.dce
SEC'TION 3.2 RUNOFF COMPUTATION AND ANALYSIS METIIODS
rICURE 3.2.1.0 25-YEAR 24-�IOUR ISOPLUVIALS
�V . �-- -- sN ItOM1f�51<COUNiY
2 ,'_ • ,� ' y'' �_ � ' �.�_ _ ___ , __ �' N�wGCOUNTY
s , t� '1�. .i ee ��� �
a �
2 +� % ` ��ii� .. t �.� �� � �J..._ �
.� � . � > ' �!� ,', _� /f
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r
����7���`��u� .!KIN6 COUNTY 1
P�E11C!COtlMiY � l
��
WESTERN � '�¢\ �
�,• �; .. � �, .
KING C�UNTY `.f� �-' YYtt �, �•s
N �C • �'-,�" �•�
�- F �
25-Year 24-Hour � � � ' �_ �,--Y
Precipitation �� � �, -�, �;�.��
in lnches °—�"""� � `'��a �� L
1/24/2005 2005 Surface Water Design Manual
3-16
12653 xls
BARGHAUSEN CONSIll71NG ENGINEERS-PIPE F�OV�'CAI UUI.ATOR
usmg �he Ra�ional Mclh�d&Ma�n�ng Formula
KING COUNTY DESIGN FOR 25 YEAR SiORM
JOB NAME: CAMIE NG NOTE:ENTER DEFAULTS AND STORM DATA BEFpRE BEGINNENG
JOBX: i2653 DEFau�TS C= 0.58 �= 00�2
FILE NR:12653-70pC1A d= �� t2 Tc= 6.3
A=ConVibuling Arw(Ac) Od=Despn Flow(cfs) COEFfICIENTS FOR 7HE RATIONAL ME7H00"I�"-EQUATION
C�RurwH Coeffidenl 0f=Fuli Capaciry Fbw(c(s� STORM Ar Br
Tc=Time o(Concenlratwn(min) Vd=Velocity at Deslgn Flow(fps� 2YR 1.58 0.58
1=Incens�ry a�7c(iNhr) Vf=ve�ociry at Fuil Flow((ps) 70YR 2.d4 O.6a NRECIP= 3.43
d=Oiameter ot Pipe{in) s=Slope oi pipe(%) 25YR 2.66 0.65 An 2.66
L=langlh ot Pipe(ft) n-Man�ing Roughness CoefficieM SOYR 275 0.65 Bn 0.85
D=Waler Depth at Qd(in) Tr-Trovel Tvne al v6(min) 100vR 2.6� 0.63
fROM TO A s L d Tc n C SUM A A'C SUM A'C 1 Od Qf QdlQf p!tl D V( Vd i t
------ ------ ""-- ------ ------ ----------- -`---- ------ --- -__1.,� ------------- ------ ----�� ----- ------ ------ ----__ _......._ ._ ..--
cbt out 1J6 0.50 106 12 6.3 0.012 0.58 1.7E3 1.02 1.02 2J6 2.82 2J3 1.032 0.85T 1028 3.48 3.93 0.42
Page 7
Camie Ng, Renton Properties SP.
Worksheet for Circular Channel
Project Description
Project File p:112000s1126531engineering112653.fm2
Worksheet Full Flow Capacity
Flow Element Circular Channel
Method Manning's Formula
Solve For Full Flow Capacity
Input Data
Mannings Coe�cient 0.012
Channel Slope 0.005400 ft/ft
Diameter 12.00 in
Results
Depth 1.00 ft
Discharge 2.73 cfs
Flow Area 0.79 ftz
Wetted Perimeter 3.14 ft
Top Width 0.00 ft
Critical Depth 0.71 ft
Percent Full 100.00
Critical Slope 0.006918 ft/ft
Velocity 3.47 ft/s I
Velocity Head 0.19 ft '
Specific Energy FULL ft
Froude Number FULL
ARaxim�m Discharge 2.94 cfs
Full Flow Capacity 2.73 cfs
Full Flow Slope 0.0050Q0 ft/ft
07!"tG/07 FlowMaster v5.95
03:04:02 PM Haestad Methods, tnc. 37 Brookside Road Waterbury, CT 06708 {203)755-1666 Page 1 of i
6.0 SPECIAL REPORTS AND STUDIES
None required.
I?653.OQ4.doc I
7.0 OTHER PERMITS
No other permits will be needed.
The site is exempt from a NPDES Permit as it is below 1 acre.
'
1�653.004.doc
8.0 TEMPORARY EROSION AND SEDIMEVTATION CONTROL ANALYSIS AND
DESIGN
TESC elements will be addressed as follows:
• Clearing Limits: Clearing limits are delineated on the engineering plans and will be
flagged in the field.
• Cover Measures: Cover measures will be comprised of hydroseeding and/or grass sods.
; Hydroseeding shall be accompanied by mulching during the wet season.
, • Perimeter Protection: Perimeter protection is shown on the engineering plans (filter
fabric silt fences).
• Traffic Area Stabilization: A stabilized rock construction entrance is shown on the
engineering plans. The gravel base for the shared driveway in Tract A may be
_ established at the contractor's option to provide a stable surface.
• Sediment Retention: The area to be cleared is smaller than 1 acre; therefore, a sediment
trap may be provided only upon request from the City of Renton construction inspector.
• Surface Water Controls: Grading exposed soils at mild slopes to sheet flow towards the
right-of-way, having a soil type with a high infiltration capacity, combined with
hydroseeding,mulching, and perimeter protection will control surface water sufficiently.
• Dust Control: Dust control by sprinkling will be utilized upon request from the City of
Renton construction inspector.
• Wet Season Construction: Construction will be conducted according to the King
County Department of Development and Environmental Services (DDES) standards
during the wet season(Oct 1-Apri130).
• Construction within Sensitive Areas and Buffers: No construction within sensitive
areas or buffers is proposed.
• Maintenance: The contractor shall inspect BMPs on a weekly basis and before
imminent rain storms. Silt shall be removed from catch basin protection and perimeter
silt fences pursuant to 2005 KCWSWDM Appendix D. Breached silt fences shall be
repaired and exposed soil be mulched upon inspection.
• Final Stabilization: Upon completion of the project, all disturbed areas will be
stabilized and Best Management Practices removed if appropriate. Dead or damaged
grass sods must be replaced. Proposed paving shall be completed and permanent
vegetation and landscaping shall be established.
' 12653.004.doc
I
9.0 BOND QUANTITIES, FACILITY SU:VIMARIES, AltiD DECLARATION OF
COVENANT
The bond quantities are included below.
126�3.004.doc
i
' GHAV
Q ��/ stn
m Z
� BOND QUANTITY ESTIMATE
� =� _ ��
_ �,,�,
P9'
�
�`-EtiG�H� ..
1
PROJECT NAME: Renton Properties SP PROJECT NO.: 12653
' LOCATION: 2132 Hartington Place NE.,Renton NO. OF LOTS: 6
' CLIENT: Camie Ng ACREAGE: 0.87
DATE OF ESTIMATE: �lovember 27,2007
'
HARD COST ESTIMATE - BOND QUANTITIES
' A. Site Gradin Clearin /Earthwork Von-Taxable S20,078
B. Sanita Sewer S stem Taxable S17,715
C. Water Su 1 S stem Taxable) S10,800
D. Public Storm Draina e S stem(Non-Ta�cable) SO
E. Private Storm Draina e S stem Taxable SO
F. Public Roadwa Im rovements on-Taxable) $6,359
G. On-Site S ecific Construction Costs Taxable $12,608
TOTAL $67,559
09i l U06 Page I of 1 12653bondquantiry-estimate.xls
F.PUBLIC ROADWAY IMPROVEMENTS
QUAnTITY linlT UMT COST TOTAL
Sawcuttin 195 LF $2.00 $390
Base Course Crushed Rock(S 1.50 er inch thickness) 147 SY $7.50 $1,103
To Course Crushed Rock S 1.75 er inch thickness 160 SY $10.50 $1,680
To Course Crushed Rock S1J5 er inch thickness 147 SY $2.63 �387
AC Pavin (�5.00 er inch thickness) 307 SY 510.00 S3,070
Thickened AC Ed e(excludes base lift) 60 LF S2.00 $120
TOTAL SECTIOV F $6,359
G. ON-SITE SPECIFIC CONSTRUCTION COSTS
QUANT[TY UNIT UV[TCOST TOTAL
To Course Crushed Rock S 1.75 er inch thickness 615 SY $10.50 S6,458
AC Pavin $5.00 er inch thickness) 615 SY S 10.00 S6,150
TOTAL SECTION G $12,608
09i I 1!06 Page 2 of 2 1?653bondquantity-estimate.xis
10.0 MAINTENANCE RECOMMENDATIOVS
Private maintenance for this short plat is limited to landscaping and private driveways. An HOA
shall not be necessary.
' I
12653.004.doc