HomeMy WebLinkAboutReport 1'.Denis -Law
Mayor •·
March 4, 2016 ·. · ·
James Jaeger; P.E ..
Jaeger Engin.eering :
9419 S 204th Place -
· ·Kent, WA 98~31
SUBJECT: . Chau Sh~rt Plat S~~rt Plat LUA09"123,' SH PL-A (King Co. :Fil~ #L03S0016)
. De~r Mr. Jaeger: .
This.offke)1as reviev.,ecl y~ur request(dated February,27, 2010j ti> extend an approved.
· short plat (File No. LUA09~123/KC File #L0,3S00i6) that expired ori March 12, 2009 .. ·
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P~rsuant fo RMC 4-l~OSOF, the. mu~icipal code grants authorization to the Pl~nning
. Director to approve a'n extension fo~ any land use. or subdivision project. therefore,
. your short plat extension request is approved; The short plat wiH expire on Mai"ch iz,
2011.·
I hop_e this extensiop meets your needs arid tb~t your project can be completed. You.
-. may call Laureen Nicolay at (425) 430-7294 if you have any further questions; · .
. : ··,_,.; ··: . ·• . ,:" '".,;: '.: ,. ' .. : .· _., .• . ··. . ' . . '. .. ·. '_'. . ·_'
C.E;,,Chip'' Vincent '
· ·Plaririing Dire~torc. ·
cc: Jennifer·Henning, Cufrent Planning Ma~nager
· Cit\iofRenton FileLUA09-123 -·•
: · Jari -~llian, Pl~n .. ReView ..
· Renton City Hall • 1055 South Grady Way • Renton, Washington 98057. • rentonwa.go~
J~GER ENGilN~Ril!NI@i
9419 S. 204 PLACE -KENT, WASHINGTON 98031
PHONE (253) 850-0934 FAX (253) 850-0155
February 27, 2010
Rocale Timmons
City of Renton -Current Planning
1055 S. Grady Way
Renton, WA. 98057
RE: Request for Extension,oJ Short Plat
Chau 3 Lot Short Plat
17034 106th Ave. SE
Dear Ms. Timmons.
City of Renton
Planning Division
MAR -2 2010
I had been working with King County on the final short plat approval of the
Chau Short Plat. Since the application to the County, the property has
been annexed to the City of Renton. The preliminary short plat approval
from the County expired last year. I am writing to request an extension that
will allow the short plat to get recorded. Last year, before the expiration. I
met with Ken Glasby, a planner for the City. He gave me the forms and·
mentioned several items that should be provided to the City to complete
the project. Mr. Glasby has since left the City and I would like to finish the
project with you. The main item that he mentioned was the paperwork for
the dedication of a small portion of ROW at the intersection. This
information was given to the surveyor for the legal description and exhibit
of the area to be dedicated. The surveyor in turn was working with the
owner to get this signed and submitted. I do not know if the
. owner-/applicant,Ms,-Ha Chau, has submitted-this to the City yeL
I did confirm with the County that the engineering plans for the roadway
improvements (curb, gutter, sidewalk, some drainage, etc.)were approved
in December of 2008. The review engineer at the County was Mazen
Haidar (206-296-7133). The County file number was L03S0016.
The project is very near completion and I am hoping that the City will grant
an extension. Please feel free to contact me with any questions. Thank
you for your attention.
F9-~
James Jaeger. P.E.
. .
JAEGER . ENGINEERI~G·
9~19 s. 204 PLA<;:E. ~·KENT; WASHINGTON ~8031. .
'PHONE (253) 850-0934 fAX (253) 850-0155.
· March.22, 2007 .
August 28, 200? ·
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. TECHNICAL INFORMATION REPORT . ·
CHAU3LOTSHORTPLAT .
. 170341061
b AVEiSE ·.· .
· CO~TY FILE NO. L03S0016
· .· L07SR022
. · PREPARED FOR:·: .
. Ha Minh Chau
4i01 150th Ave. SE . .
B~H~vue, WA._ 98006 ' ..
(425) 643-3993 ·
PREP ARE~_BY:
' ' . ' .
. Jame:s J:Jaeger, p'£.· .
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JAEGER ENGINEERING
9419 s. 204 PLACE • KENT~ WASHINGTON 98031
PHONE (253) 850-0934 FAX (253) 850-0155
March 22; 2007
August 28, 2008
· SMALL SITE DRAINAGE .
TECHNICAL INFORMATION REPORT
PREPARED FOR:
Ha Minh Chau
CHAU3LOTSHORTPLAT
i 7034 1061b A VE. SE
COUNTY FILE NO. L03S0016
L07SR022
4101 150th Ave. SE
Bellevue, WA. 98006
(425) 6.43-3993
PREPARED BY:
James J. Jaeger, P.E.
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I. OVERVIEW
The proposed project is a 3 lot short plat located at the southeast corner
of the intersection of SE 172nd St. and 106th Ave. SE. The property is 0.34
acres and is proposed to divide into 3 new single family lots. two lots of
approx. 4500 SF and a larger lot of approx. 5500 SF. The property is zoned
R-8. There is and existing house and carport that will be demolished and
removed. Also on the site is an gravel driveway that is connected to 106th
Ave. SE. This driveway will also be removed. Access to the new houses
will be a joint driveway (lots 2 and 3) from 1061h Ave. SE. and single
driveway (Lot l) from SE 172nd St.
Both of the frontage streets are currently unimproved. Both will be
improved with curb, gutter. sidewalk and pavement widening to meet the
urban sub-access road standard. The pavement widening will be
measured from the centerline of the existing pavement. rather than the
ROW centerline, per discussion with County staff. This was agreed to by
the County so that additional ROW would not be needed to construct the
necessary road width. The existing lot and future lots will be fully served
by the existing public utilities.
The site is nearly flat in the northeast corner and then begins an increasing
slope down to the southwest corner. The maximum slope near this corner
is approx. 12%. The site slopes down to both frontage streets. The site
vegetation is primarily tall grass, brush with sporadic trees and shrubs.
There is a row of fir trees along the 106th Ave. SE frontage. There are no
sensitive areas or hazard designations within this site. This property is
basically a large existing lot on a corner of an older plat.
There are no drainage improvements on the site itself. However, there are
several culverts and ditches along the edges of both street frontages. All
of the ditches drain to an existing culvert located near the southwest
property corner. Along with the proposed new curb, gutter and
sidewalks, the applicant will install a gutter drainage system consisting of
catch basins and piping that will connect to the existing catch basin. This
new gutter system will collect all of the runoff from the half streets along
the frontage as well as the existing ditches upstream from the property.
The new lots will include a roof downspout drainage piping system that
will be connected lo individual dispersal trenches. Each lot will also have
a connection stub pipe to the public drainage system for footing drains ..
The project is exempt from drainage detention and water quality
enhancement as will be shown on the developed drainage section.
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King County
Department of Development
and Environmental Services
900 Oakesdale Avenue SW
Renton, WA 98055-1219
File No.
File Name:
CONDITIONS OF APPROVAL
L03S0016
Chau Short Plat
· Application Date: May 2, 2003
Revision Date: January 30, 2004
This short subdivision is granted preliminary approval subject to the following Conditions of
Approval. These conditions are based on a field visit and current information the applicant
has provided about the short subdivision property. Occasionally, in satisfying the Conditions
of Approval, a more definitive land use limitation of the property may be revealed. New
information (such as final Health approval or sensitive areas review) may require additional
conditions and may reduce the number oflots.
Final approval will be granted after compliance with the Conditions of Approval. Key codes
and guidelines have been noted to provide guidance in preparing the required plans and other
documents. Compliance with some of the following conditions will require that engineering
plans be prepared by a professional civil engineer licensed in the State of Washington.
1. Title 19A
A. The short subdivision shall comply with all provisions of Title 19A.
B. The final review process must be completed prior to recording of the short
subdivision. The Department of Development and Environmental Services
(DDES) strongly recommends the Final Short Plat be submitted at least one
year prior to the expiration date of the project. The Final Short Plat submittal
package includes:
I. A surveyed map page (four sets) including lot area closure calculations;
2. Final health approval from the King County Health Department (different
. from preliminary health approval);
3. A current short plat certificate and supporting documents (easements, etc.);
4. Payment of the Final Short Plat submittal fee;
5. A copy of this letter (preliminary approval letter).
A licensed land surveyor shall be hired to prepare the final short subdivision
documents. These documents shall comply with all of the following
conditions for final approval:
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C. All persons having an ownership interest in the subject property are required to
sign the final short subdivision.
D. If modifications to the approved preliminary site plan (Attachment I) are
needed to accomplish engineering design or final short plat, then a revised
preliminary site plan shall be submitted to DDES for review and approval.
The revised site plans shall be submitted with the engineering plans or the final
short plat submittal.
2. Surface \Valer Management (KCC 9)
1998 King County Surface \Vater Design Manual (S\VDM)
A. This short subdivision proposal is subject to Full Drainage Review per section
1.1.2.3. Final short subdivision approval shall require full compliance with
drainage provisions and storm drainage requirements of this section.
Compliance may result in reducing the number and/or location of lots shown
on the approved preliminary short subdivision. The conditions outlined below
are site-specific drainage conditions:
(1) Core Requirement #1 -Discharge at the Natural Location
(2) Core Requirement #2 -Off-Site Analysis
(3) Core Requirement #3 -Flow Control
(4) Core Requirement #4 -Conveyance System
(5) Core Requirement #5 -Erosion & Sedimentation Control
(6) Core Requirement #6 -Maintenance and Operation
(7) Core Requirement #7 -Financial Guarantees & Liability
(8) Core Requirement #8 -Water Quality
(SI) Special Requirement #1 -Other Adopted Requirements
B. A professional civil engineer licensed in the State of Washington shall prepare
a Technical Information Report and/or engineering plans per Chapter 2, of the
1998 King County Surface Water Design Manual.
3. Health (KCC 13)
This project is exempt from further King County Heath Department review.
However, if improvements are required from the Sewer and/or the Water
District, then verification shall be required from said District(s) that the
improvements have been bonded and/or installed, prior to final recording of
the short plat.
' 4. Road Standards (KCC 14)
1993 King County Road Standards, Ordinance 11187
Final short subdivision approval shall require full compliance with the provisions set
forth in the King County Road Standards including engineering plans for all road
improvements. The engineering plans shall be prepared by a professional civil
engineer licensed in the State of Washington. DOES strongly recommends the
· Engineering Plans be submitted at least two years prior to the expiration date of the
project.
A. That portion of the North half of SE J 72"d Street adjoining the subject property
shall be improved to an urban Sub-access standard per KCRS Section 1.03.
B. That portion of the East half of 106th Avenue SE adjoining the subject property ·
shall be improved to an urban Sub-access standard per KCRS Section 1.03.
C. Provide 35' paved radii at the intersection of I 061h Avenue SE and SE 172
Street per KCRS Section 2.10. Dedicate a 25-foot property line radius at the
intersection of I 06'h A venue SE and SE I 72"d Street per KCRS Section 2.10.
D. Existing roadside obstacle(s) shall be relocated to provide a minimum
clearance of 10 feet from the edge of the travel lane to the obstacle(s) per
KCRS Section 5.11.
E. Private access to Lots 2 and 3 shall be shown as a joint-use driveway tract per
KCRS Section 3.01. The tract shall be an undivided ownership to the lots it
serves, and the lot owners shall be responsible for its maintenance. The tract
shall be 20-feet wide with a 18-foot-wide paved surface. The tract shall be a
minimum of 20 feet in length.
· F. The following notes shall be shown on the final recorded short subdivision:
I) \Varning: King County has no responsibility to build, improve,
maintain or otherwise service the private roads contained within or
providing service to the property described in this short subdivision.
2) All private easements and/or tracts to be maintained, repaired, and/or
rebuilt by the owners of the parcels having legal access therefrom and
their heirs, assigns or successors, unless and until such roads are
improved to King County standards and are dedicated and accepted by
King County for maintenance.
G. All utilities within proposed rights-of-way shall be included within a franchise
approved by the King County Council prior to final short subdivision
recording.
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H. All restrictions, easements, tracts, and their purpose shall be shown on the final
recorded short subdivision.
5. Building and _Construction Standards (Title 16)
Grading. The applicant shall comply with all applicable provisions of KCC 16.82.
6. Fire Code (KCC 17)
Section 902 of the 1997 Edition of Uniform Fire Code
The applicant shall obtain the approval of the King County Fire Protection Engineer
for the adequacy of the fire hydrant, water main, and fire flow standards ofKCC 17.08
prior to recoding of the lots.
7. Zoning Code (KCC 21A)
A. Density and Dimensions (KCC 21 A.12)
All lots shall meet the density and dimensions requirements of the R-8-SO
zone classification or shall be as shown on the face of the approved prelimi-
nary short subdivision, whichever is larger. Minor revisions to the short
subdivision, which do not result in substantial changes and/or do not create
additional lots may be approved at the discretion of LUSD.
B. Street Trees (KCC 21 A.16)
Street trees shall be provided along that portion of the right-of-way for
l 061h Avenue Southeast and Southeast l 72"d Street abutting the subject
property, pursuant to the provisions of KCC 2 IA.16.050(E) and KCC
21 A.16.190, unless existing trees are shown to be equivalent to the
requirement of Code. See note below. The required street trees shall be
designed as to location and spacing on the final plan submittal. The street trees
must be installed and inspected, or a performance bond posted, prior to
recording of the plat. If a performance bond is posted, the street trees must be ·
installed and inspected within one year of recording of the plat. At the time of
inspection, if the trees are found to be installed per the approved plan, a
maintenance bond must be submitted, or the performance bond replaced with a
maintenance bond, and held for one year. After one year, the maintenance
bond may be released after DDES has completed a second inspection and
determined that the trees have been kept healthy and thriving.
NOTE:
I. KCC 21A.16.0SO Landscaping -street frontages. The average
width of perimeter landscaping along street frontages shall be provided as
follows:
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For single-family subdivisions:
a. Trees shall be planted at the rate of one tree for every 40 feet of
frontage along a neighborhood collector street or arterial street.
b. The trees shall be: ·
· I. Located within the street right-of-way if permitted by the
custodial state or local agency;
2. No more than 20 feet from the street right-of-way line when
located within a lot;
3. Maintained by the adjacent landowner unless part of a County
maintenance program; and
4. A species approved by the County if located within the street
right-of-way and compatible with overhead utility lines.
c. The.trees may be spread at irregular intervals in order to
accommodate sight distance requirements for driveways and
intersections.
2. KCC 21A.16.190 Financial guarantees. Financial guarantees shall
be.required consistent with the provisions of Title 27A.
C. Significant Tree Retention-KCC 21 A.38.230 which applies to the site, a
detailed tree retention plan shall be submitted with the engineering plans for
the subject plat. The tree retention plan (and engineering plans) shall be
consistent with the requirements ofKCC 21A.38.230, as well as the conceptual
tree retention plan which is part of the hearing record for this project. No
clearing of the subject property is permitted until the final tree retention plan is
approved by LUSD. Flagging and temporary fencing of trees to be retained
shall be provided, consistent with KCC 21A.38.230B4. The placement of
impervious surfaces, fill material, excavation work, or the storage of
construction materials is prohibited within the fenced areas around preserved
trees, except for grading work permitted pursuant to KCC 21A.38.230B4d(2).
A note shall be placed on the final plat indicating that the trees shown to be
retained on the tree retention plan shall be maintained by the future owners of
the proposed lots, consistent with KCC 21A.38.230B6. (Note that the tree
retention plan shall be included as part of the final engineering plans for the
subject plat.) If there are no significant trees as defined by the Special Overlay
District on the site then, this requirement does not apply.
D. The existing house shall be removed or demolished prior to the final approval
and recording. A demolition pennit shall be obtained prior to demolition.
8. Road Mitigation Payment System
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The applicant shall comply with Road Mitigation Payment System (MPS), by paying
the required MPS fee as determined by King County Department of Transportation,
plus an administrative fee. The applicant has an option to either:
A. Pay the. MPS fee at final short subdivision recording and the MPS
administrative fee at final short subdivision application, or
B. Pay the MPS fee at building permit issuance and the MPS administrative fee at
the time of building permit application.
If option A is chosen, then the following note shall be shown on the final short
plat:
MPS FEE NOTICE:
All fees required by King County code 14. 75, Mitigation Payment System
(MPS) have been paid.
If option B is chosen, then the following note shall be shown on the final short
plat:
MPS FEE NOTICE:
This short plat is subject to King County Code No. 14.75, King County Road
Mitigation Payment System (MPS). The MPS fees plus the MPS
administrative fee shall be paid at the time of building permit application at
the rate in effect at that time.
9. State Environmental Policy Act (SEPA)
This short subdivision was exempt from the provision of the State Environmental
Policy Act (SEP A).
10. Other Considerations
Preliminary approval of this application does not limit the applicant's responsibility to
obtain any required permit or license from the State or other regulatory body. This
may include obtaining a forest practice permit from the Washington State Department
of Natural Resources for tree removal.
KING COUNTY
LAND USE SERVICES
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Transmitted to the following Parties of Record for short plat L03S0016:
Cramer Northwest Inc.
945 N. Central Ave., Suite #104 Kent, WA 98032
Mr. & Mrs. G.A. Headland
17030 106 1h Ave SE Renton, WA 98055
Jay Newton
17006 106th Ave SE Renton, WA 98055
Trishah Bull, Project Manager II, DDES Land Use Services Division
Curt Foster, Sr. Engineer, DDES Land Use Services Division
Mazen Haidar, Engineer, DDES Land Use Services Division
Rich Hudson, Program Manager III, DDES Land Use Services Division
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ATTACHMENT A
RIGHT TO APPEAL
This action may be appealed in writing to the King County Hearing Examiner, with a fee
of$250.00 (check payable to King County Office of Finance).
As required by KCC 20.20.090 and 20.24.090, the appeal period shall be fourteen (14)
calendar days and shall commence on the third day after the notice of decision is mailed.
Filing an appeal requires actual delivery to the King County Land Use Services Division
prior to the close of business (4:30 p.m.) on the date due. Prior mailing is not sufficient if
actual receipt by the Division does not occur within the applicable time period. The
Examiner does not have authority to extend the time period unless the Division is not
open on the specified closing date, in which event delivery prior to the close of business
on the next business day is sufficient to meet the filing requirement.
If a timely Notice of Appeal has been filed, the appellant shall file a statement of appeal
within a 21-day calendar period commencing three days after the notice of decision is
mailed. The statement of appeal shall identify the decision being appealed (including file
number) and the alleged errors in that decision.
The statement of appeal shall state: 1) specific reasons why the decision should be
reversed or modified; and 2) the harm suffered or anticipated by the appellant, and the
relief sought. The scope of an appeal shall be based on matters or issues raised in the
statement of appeal. Failure to timely file a notice of appeal, appeal fee, or statement of
appeal deprives the Examiner of jurisdiction to consider the appeal.
Appeals must be submitted to the Department of Development and Environmental
Services, addressed as follows:
LAND USE APPEAL
Land Use Services Division
Department of Development and Environmental Services
BlackR.iver Corporate Park
900 Oakesdale Avenue Southwest
Renton, WA 98055-1219
A request for a pre-hearing conference may be made by any party. For more infomiation
regarding appeal proceedings and pre-hearing conferences, please contact the Office of
the Examiner for a Citizens' Guide to the Examiner hearings and/or read KCC 20.20 and
20.24.
PROJECT INFORMATION
Proposal: Short Plat
Location: 17034 106th Avenue SE
Renton, Washington 98055
Owner: Ha Chau
Area: Approximately .33 acre
Soils: AgC (Alderwood gravelly sandy loam)
Legal Description: Lot 13, Block 4, Aker's Farms No. 5
Volume 40, Page 27
Tax Parcel No: 008700-0280-07
PROJECT DESCRIPTION
This project proposes to subdivide approximately 1/3 acre of land into 3 (three) lots.
Presently there is a single family residence with carport located at the north side of the
parcel. As a result of the subdivision, the existing house will be partially or entirely
demolished.
The ground consists of lawn, three pine trees in the front yard, a row of small fu trees
along the west property line, and a gravel driveway. The parcel is bordered by S.E. 172°d
Street along the south side, and by I 06th A venue S .E. along the west side.
Attached are site pictures, a vicinity map, a soils map, U.S.G.S. aerial topography map,
and a schematic storm drainage plan. These enclosures were used in this analysis as
resources.
DOWNSTREAM ANALYSIS
The ground of the parcel slopes from northeast corner down to southeast corner at a
moderate slope of ten ( I 0) percent. The sheet flow from the parcel is collected by the
ditches along the south and west property lines. Both of these ditches are located in the
public right-of-way and meet outside of the southwest corner of the property. The west
side and south side ditches are connected via eighteen (18) inch and twelve (12) inch
diameter short culverts, respectively, into a catch basin located in the northeast corner of
the intersection.
There is a twelve (12) inch diameter outgoing reinforced concrete pipe culvert from the
catch basin running diagonally across the intersection at an approximate slope of7.7%.
Page I of2 ct:s
This culvert daylights into a wooded ravine that continues to slope down in a
southwesterly direction until it becomes a roadside ditch for the State Route 515 (Talbot
Road), at a point at least a •;. mile from the proposed subdivision. There are no evident
signs of erosion or capacity problems within this existing downstream storm drainage
conveyance system. Eventually the runoff from the property is part of the Panther Creek
Wetland that is drained into Lake Washington via Green River.
A site visit to verify these conditions was made on March 6, 2003, by CTS Engineers,
Inc.
PROPOSED SITE DRAINAGE IMPROVEMENTS
Each ditch on the south and west of the subject property currently outlets via a short
culvert which connects to an existing catch basin at the NE comer of the intersection of
I 06th Ave SE and SE 172nd St. As part of the access improvements to the subdivided
property, it is proposed to replace both existing ditches with culverts, filling each ditch to
the level of street pavement. In addition, the existing catch basin is proposed to be
replaced with a larger catch basin or storm drain manhole. Site drainage and storm runoff
will be directed into below-grade pipes which will connect to the proposed culverts
upstream of the replaced catch basin.
Refer to the attached preliminary storm drainage plan for a graphical representation of the
proposed improvements.
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II. PEAK RUNOFF FLOWS
A. PREDEVELOPED DRAINAGE
The pre-developed drainage basin includes the entire subject property
plus a portion of the two frontage roads. T.he frontage road areas were
included because the proposed curb. gutter and sidewalk will add new
impervious surface that must be accounted for in the drainage
calculations. The on-site area was calculated to be 0.34 acres. The area
of the frontage road improvements was determined using only the area
from the edge of the existing pavement to the ROW line. The existing road
pavement was not included in the calculations because this area will not
be changed. The frontage area was calculated to be 3982 SF, or 0.09
acres. This provided a total project area of 0.43 acres. The existing house
and gravel driveway also presented existing impervious surface. This
existing impervious surface was calculated to be 0.07 acres. Note that
only 50% of the gravel driveway was counted as impervious surface, per
code. The remaining pre-developed area was considered till pasture.
The pre-developed drainage analysis was performed using the "KCRTS"
hydrology software and its summary tables and charts are attached for
reference. The methods outlined in the 1998 King County Surface Water
Design Manual were used as guidelines. Following this page are the data
sheets used for the computer input data. The computer summary sheets
for peak flows are also attached. Below is a brief description of the
existing drainage characteristics:
2 year peak flow:
l O year peak flow:
l 00 year peak flow:
project area:
till pasture:
impervious area:
0.024 CFS
0.040 CFS
0.076 CFS
0.43 acres
0.36 acres
0.07 acres
CHAU SHORT PLAT
KCRTS PEAK FLOW SUMMARY
PRE-DEVELOPED DRAINAGE
Flow Frequency Analysis
Time Series File:chaupre.tsf
Project Location:Sea-Tac
---Annual Peak Flow Rates--------Flow Frequency Analysis-------
Flow Rate Rank Time of Peak --Peaks Rank Return Prob
(CFS) (CFS) Period
0.037 4 2/09/01 15:00 0.076 1 100.00 0.990
0.024 6 1/05/02 16:00 0.042 2 25.00 0.960
0.042 2 2/27/03 7:00 0.040 3 10.00 0.900
0.019 8 8/26/04 2:00 0.037 4 5.00 0.800
0.024 7 1/05/05 8:00 0.037 5 3.00 0.667
0.040 3 1/18/06 16:00 0.024 6 2.00 0.500
0.037 5 11/24/06 3:00 0.024 7 1. 30 0.231
0.076 1 1/09/08 6:00 0.019 8 1.10 0.091
Computed Peaks 0.065 50.00 0.980
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? . i::=.~ sn ~ , G-LJ'C\~~-R."1 J"uS' :
II
I ~~$ b~ . 2497 ;se
II ~st. ~\~ c:h:::1~'. 6 <c," -s;-F
II 0--Jfo )'MF£ -4±.3 Sr
' I ~ -h>hl Q,kj'ST, I~, :z_q~ }P
:: 0,0t Ac_
II
311 S'><I s'I, N Gee P~~J_QUS"
II ~ Ll.:s:e... -h\\ I f43 h..,ce...
Ill B';) a,r e.c.._ ;:-O 4"3. -(!),01 -0. 3l,, (\c..,
Ill
4.111 :R f"l \ NA:'r\.-L,,, ~jSA:.fo ..._1 ••
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II
.c,. II lecf<J.'; PPE-uc;~:·J. Pr=-A-K-~s-
II
l 0-'--. 2-'<r· -D.b24-
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II /OD TC.· ~ o.011~
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II .
' I i
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I
I I I
~-~-·-· 11
B. DEVELOPED DRAINAGE
The developed drainage calculations used the same project area as the
pre-developed calculations. The impervious surfaces included the 3 new
houses. 3 new driveways, the joint use driveway and the frontage
improvements for 106th Ave SE and Se 172nd St. The applicant provided
specific house plans for the three new lots. The footprint for these specific
houses was uses as the impervious surface area for the new houses at
each lot. These areas are shown on the attached worksheet. A driveway
for each lot was also calculated using the site plan that was provided by
the applicant. The areas for the driveways were taken directly from the
plan for each new lot. The joint use driveway was calculated to cover the
"worse" condition of extending the full length of the common lot line
between Lots 2 and 3. The required pavement with of 18 ft. was used.
The frontage improvement impervious surface includes the new sidewalk.
curb and pavement widening. The pavement widening width was
calculated using an average width of the additional pavement for both
streets. The developed pervious surface was considered as till lawn.
Similar to the existing condition. the KCRTS method was used to determine
the peak flows for the various storm events. The computer data sheets for
the developed flows follow this page. A brief summary of the developed
drainage characteristics are:
2 year peak flow:
10 year peak flow:
100 year peak flow:
total area:
till lawn:
impervious area:
0.075 CFS
0.091 CFS
0.153 CFS
0.43 acres
0.19 acres
0.24 acres
Time
CHAU SHORT PLAT
KCRTS PEAK FLOW SUMMARY
DEVELOPED DRAINAGE
Flow Frequency Analysis
Series File:chaudev.tsf
Project Location:Sea-Tac
---Annual Peak Flow Rates--------Flow Frequency Analysis-------
Flow Rate Rank Time of Peak -Peaks Rank Return Prob
(CFS) (CFS) Period
0.075 6 2/09/01 2:00 0.153 1 100.00 0.990
0.060 8 1/05/02 16:00 0.092 2 25.00 0.960
0.091 3 2/27/03 7:00 0.091 3 10.00 0.900
0.063 7 8/26/04 2:00 0.079 4 5.00 0.800
0.076 5 10/28/04 16:00 0.076 5 3.00 0.667
0.079 4 1/18/06 16:00 0.075 6 2.00 0.500
0.092 2 10/26/06 0:00 0.063 7 1. 30 0.231
0.153 1 1/09/08 6:00 0.060 8 1.10 0.091
Computed Peaks 0.133 50.00 0.980
----++t-------,-1..,_,,-t=~'----.~-.q:OBI:..i..._---1:p_'-":u----------
----+++----~~E:>-lE.LD ~ D-~._.f'r:~(N~~~~-------
II
___ "2-_,----;;-,-f ff _~~~"--'-"''-""-----'Lro'"""-'--'-'--'p~~=D~-'-------------
1 ff I ; /'o • Zi:; 2.
::: IQ( l I to)+ QI. D(/ 4-o) : .64-13
---~~---~e=>':..1-----"b?=-'-b--_\~, ""'=_._r::_,,vw.,10='-'"-":s:.__._· ____ _.,_,,/ D,._7_,_,__,I o=-~:sF"-'-r __
1111 s) -,-
----,---------------------==---, 0~ -z..4-Ac..-.
jl'i !,l
If' , I
111
Ill
II
II
iii
If
2.. "r
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::
::: 0. OCf(
::: O,r53
C. HYDROLOGIC ANALYSIS
The site qualifies for an exemption from Core Requirement #3. Flow
Control. Exemption #3 (page 1-27. attached) is met. This is the peak flow
exemption using flow control BMP's. The 100 year peak developed flow is
0.153 CFS. The 100 year peak pre-developed flow is 0.07 6 CFS. The
difference is 0.077 CFS. which is less than 0.1 CFS limit to qualify for this
exemption. In addition, the site is a re-development project and is not
located within a critical drainage area or a landslide hazard drainage
area. The project is a single family residential project; also needed to
qualify for this exemption.
The flow control BMP used for this project is individual lot dispersal
trenches. Individual lot infiltration is not an alternative because the soils
are of the Alderwood series (hydrologic group CJ. These soils have slow
permeability rates and high ground water.
The site qualifies for small site drainage review since the net new
impervious surface is less than 10.000 SF. The new impervious from the
development of the site and the 3 lots is 10.710 SF. The existing impervious
surface to be removed is 2,940 SF. The net new impervious surface is 7.770
SF.
D. WATER QUALITY CONTROL
The site also qualifies for an exemption from Core Requirement #8, Water
Quality. Exemption # 1, surface area exemption (page 1-50. attached) is
met. The developed site will be adding less than 5000 SF of new
impervious surface subject to vehicular traffic (PGIS). The new PGIS area
includes the 3 new driveways for each lot. the joint use driveway and the
pavement widening along both frontage roads. The totals for these
areas are:
• 3 driveways: 546 SF
• joint driveway: 1080 SF
• 106 Ave. widening: 708 SF
• 172 St. widening: 140 SF
TOTAL: 247 4 SF
This does not count the existing gravel driveway that is being removed
(credit for 50% of the area). This does show that the project meets the
requirements for the surface area exemption.
... ----
I .:!.3 CORE REQUIREME.'T #3: FLOW CO:-.TIOL
CJ EXEMPTIONS FROM CORE REQUIREMENT #3
There are eight possible exemptions from the requirement 10 provide a formal flow control facility per
Core Requirement #3. The intent of these exemptions is to provide for situations where a facility may not
be practical or needed, where other alternatives to a facility can be just as effective, or where it makes
sense to provide incentives for retaining native vegetation or for maximizing use of existing developed
areas.
1. Impervious Suriace Exemption
A proposed project or any threshold discharge area within a project is exempt if less than 5,000
square feet of new impervious surface will be added and the project or threshold discharge area is not
within a Landslide Hazard Drainage Area." If the project or threshold discharge area is located
within a Landslide Hazard Drainage Area, this exemption only applies to new impervious surface less
than 2,000 square feet.
2. Impervious Surface Exemption Using Flow Control BMPs
Any threshold discharge area within a proposed project is exempt if less than 10,000 square feet of
new impervious surface will be added, AND all of the following criteria are met:
a) The area cleared to accommodate the proposed project must be less than 35% or less than 2 acres
of the threshold discharge area (whichever is greater), AND
b) If the project is a single family residential project, flow control BMPs must be applied within
the threshold discharge area as specified in Small Site Drainage Requirements (detached
Appendix C), AND
c) · For projects other than single family residential projects, the new impervious surface within
· the threshold discharge area must be comprised of either non-pollution-generating roofs that
comply with the roof downspout controls in Section 5.1, OR roads, trails, or drivewavs that
· comply with the rural roadway dispersion requirements in Section 5.2.1, Al\TI ' ·
d) The manner in which runoff is discharged from the project site must not create a significant
adverse impact per Core Requirement #1.
3. Peak Flow Exemption Using Flow Control BMPs
Any threshold discharge area within a proposed project is exempt if the project improvements within
the threshold discharge area generate less than a 0.1 cfs increase in the existing site conditions"' 100-
year peak flow rate, AND all of the following criteria are met:
a) If the project is a rede,·elopment project, flow control BMPs must be applied as specified in
Section 5.2, and the project improvements must not significantly impact a "severe erosion
problem" or "severe flooding problem" (see page 1-21), and must not be located within a
Landslide Hazard Drainage Area, AND
b) If the project is a single family residential project, the runoff from impervious surfaces must be
infiltrated or dispersed using flow control BMPs specified in Appendix C, and any areas of native
31 Landslide Hazard Drainage Areas are delineated on a map adopted with this manual (see map pocket on inside of back
cover).
32 Existing site conditions depend on what, if any, land conversion activity has occurred on the si1e since May 1979 when King
County first required flow control on developments adding more than 5,000 square feet of new impervious surface. IF a
drainage plan has been approved by the County since May , 979 for any land conversion activity which includes the addition of
more than 5,000 square feet of new impervious surface, THEN existing site conditions are those created by the site
improvements and drainage facilities·constructed per 1he approved engineering plans. OTHERWISE, existing site conditions
are those that existed prior to May 1979 as determined from aerial photographs and, if necessary, on knowledge of individuals
familiar with the area. The intent is to mitiga1e unaddressed impacts created by site alterations or improvements, such as
clearing, which have occurred since May 1979. "·
1998 Surface \Vater Design Manual 9/1/98
1-27
SECTION 1.2 CORE REQL'IREME.'-'TS
9/1/98
vegetation assumed not to be cleared for the purposes of computing the increase in 100-year peak
flow must be preserved within a tract or by covenant as described in Appendix C, AND
c) For projects other than rede>·elopment projects and single family residential projects, the
new impervious surface within the threshold discharge area must be comprised of either non-
pollution-generating roofs that comply with the roof downspout controls in Section 5.1, OR roads,
trails, or driveways that comply with the rural roadway dispersion reguirements in Section 5.2.1,
AND
d) The manner in which runoff is discharged from the project site must not create a significant
adverse impact per Core Reguirement #I.
4. Peak Flow Exemption for Urban Redevelopment Projects
Any natural discharge area of a redevelopment project located within the Urban Growth Area is
exempt if the project improvements within the natural discharge area generate Jess than a 0.1 cfs
increase in the existing site conditions JOO-year peak flow, A.1\'D all of the following criteria are met:
a) The application of this exemption to narural discharge areas within a proposed project must not
result in more than a 0.4 cfs increase in the existing site conditions I 00-year peak flow rate for any
threshold discharge area of the project, AND
b) Flow control B~{Ps must be applied to the runoff from new impervious surfaces as specified in
Section 5.2.J, AND
c) The project impro,·ements within the natural discharge area must not be located within a
Landslide Hazard Drainage Area and must not significantly impact a "severe erosion problem"
or "severe flooding problem" (see page 1-21), AND
d) · .. The manner in which runoff is discharged from the project site must not create a significant
adverse impact per Core Requirement #I.
5., Forested Open Space Exemption for Rural Residential Projects
Any natural discharge area within a proposed rural residential project (zoned RA-2.5, RA-5, RA-I 0,
or RA-20) is exempt if all of the following criteria are met:
a) At least 65% of the unsubmerged portion" of the natural discharge area will be set aside as
forested open space as specified in Section 5.2.1. Al\'D
b) The runoff from new impervious surfaces within the natural discharge area will be dispersed over
native vegetation using the flow control Bl\1Ps detailed in Section 5.2.1, A.1\"D
c) The manner in which runoff is discharged from the project site will not create a significant
adverse impact per Core Requirement #l.
6. Direct Discharge Exemption
Any natural discharge area within a proposed project is exempt if it drains to one of the "major
receiving waters" listed in Table 1.2.3.B, AND meets all of the following criteria for direct
discharge•• to that receiving water:
a) The flowpath from the project site discharge point to the edge of the JOO-year floodplain of the
major receiving water shall be no longer than a quarter mile, except for discharges to Lake
Sammamish, Lake Washington, and Puget Sound, AND
b) The conveyance system between the project site and the ordinary high water line of the major
receiving water shall be comprised of manmade com·eyance elements (pipes, ditches, outfall
33 Unsubmerged portion means any portion outside lhe ordinary high water line of streams, lakes, and wetlands .
.s.: Direct discharge means unde!ained discharge from a proposed project to a "major receiving wa1er."
1998 Surface W:Her Design M.mua1
1-28
SECTION 1.2 CORE REQUJREME:-.'TS
• Special Requirement #5: Oil Control, Section 1.3.5 (p. 1-62)-This requirement applies special oil
controls to those projects proposing to develop or redevelop a high-use site.
Key Definitions
• Pollution-generating impervious surface (PGIS) Definition: Those impervious surfaces considered
to be a significant source of pollutants in stormwater runoff. Such surfaces include those which are
subject to vehicular use" or storage of erodable or teachable materials, wastes, or chemicals," and
which receive direct rainfall or the run-on or blow-in of rainfall. 48 Metal roofs are also considered to
be PGIS unless they are treated to prevent leaching.
• Pollution-generating pervious surface (PGPS) Definition: Any non-impervious surface with
vegetative ground cover subject to use of pesticides and fertilizers. Such surfaces include. but are not
limited to, the lawn and landscaped areas of residential or commercial sites, golf courses, parks and
sports fields .
....---;j>;... D EXEMPTIONS FROM CORE REQUIREMENT #8
9/1/98
There are five possible exemptions from the requirement to provide a formal water quality facility per
Core Requirement #8:
1. Surface Area Exemption
A proposed project or any threshold discharge area within a project is exempt if it meets all of the
following criteria:
a) Less than 5,000 square feet of new PGJS'' will be added. AND
b) Less than 5,000 square feet of contiguous PGIS'' will be created through any combination of new
and/or replaced impen·ious surface as part of a redevelopment project, AND
c) Less than 1 acre of contiguous PGPS'' will be added and/or modified," OR there is a formal
agreement with King County to implement a landscape management plan" for the PGPS areas on
the site (or a farm management plan in the case of an agricultural land use).
46 A surface. whether paved or not, shall be considered subject to vehicular use if it is regularly used by motor vehicles. The
following are considered regularly-used surfaces: roads, unvegetated road shoulders, bike lanes within the traveled lane of a
roadway, driveways, parking lots, unfenced fire!anes, diesel equipment storage yards, and airport runways. The following are
not considered regularly-used surfaces: road shoulders primarily used for emergency parking, paved bicycle pathways, bicycle
lanes adjacent to unpaved or paved road shoulders primarily used for emergency parking, fenced firelanes, and infrequently
used maintenance access roads.
47 Erodable or leachabfe materials, \IYastes, or chemicals are those substances which, when exposed to rainfall, measurably alter
the physical or chemical characteristics of the rainfall runoff {examples include erodable soil, uncovered process wastes,
manure, fertilizers, oily substances, ashes, kiln dust. garbage dumpster leakage, etc.).
48 A covered parking area would be considered pollution-generating if runoff from uphill could regularly run through it, or if rainfall
could regularly blow in and wet the pavement surface. The same par1<ing area would not be included if it were enclosed by
walls or if a low wall and berm prevented stormwater from being blown in or from running onto the covered area.
49 New PGIS means new impervious surface (as defined on page 1-4) that is pollution-generating.
so Contiguous PGIS means a discrete patch of PGJS that is all together as opposed to being separated in different locations on
the project site. As used in this and other exemptions, the intent is to apply Core Requirement #8 to those redevelopment
projects that are replacing and/or adding enough impervious surface in one location to allow for opporiune installation of a
water quality facility.
51 Contiguous PGPS means a patch of PGPS that is au together as opposed to being separated in different locations on the
project site.
52 Modified PGPS means any existing PGPS that is re-graded or re-contoured by the proposed project.
53 Landscape management plan means a King County approved plan for defining the layout and long-term maintenance of
landscaping features to minimize the use of pesticides and fertilizers. and to reduce the discharge cl suspended solids and
other pollutants. Guidelines for preparing landscape management plans can be found in Reference Section 4-A. Submittal
requirements are detailed in Section 2.3.1.4.
1998 Surface Water Dc:sign ~b.nuJ.l
1-50
Site Improvement Bond Quantity Worksheet
King County Department of Development & Environmental Services
900 Oakesdale Avenue Southwest
Renton, Washington 98055-1219
Project Name: Chau 3 Lot Short Plat
Location: 17034 106th Ave. SE
Clearing greater than or equal to 5,000 board feet of timber?
-~~~~~~-yes XXXXXXXXX no
If yes,
Forest Practice Permit Number: ---------
(RCW 76.09)
Page 1 of 9
/''
A~c:.r:;,iSPRond
Date: 28-Au.9.-08
Project No.: L03S0016
Activity No.: L07SR022
Note: All prices include labor, equipment, materials, overhead and
profit. Prices are from RS Means data adjusted for the Seattle area
or from local sources if not included in the RS Means database.
Unit prices updated: 02/12/02
Version: 04/22/02
Report Date: 9/8/2008
Site Improvement Bond Quantity Worksheet
Reference#
EROSION/SEDIMENT CONTROL
Backfill & compaction-embankment
Check dams, 4" minus rock SWDM 5.4.6.3
Crushed surfacino 1 1/4" minus WSDOT 9-03.913\
Ditchinq
Excavation-bulk
Fence, silt SWDM 5.4.3.1
Fence, Temporary (NGPE)
Hvdroseedinq SWDM 5.4.2.4
Jute Mesh SWDM 5.4.2.2
Mulch, by hand, straw, 3" deep SWDM 5.4.2.1
Mulch, by machine, straw, 2" deep SWDM 5.4.2.1
Pioina, temoorarv, CPP, 6"
Pioinci, temporary, CPP, 8"
Piping, temPorarv, CPP, 12"
Plastic coverina, 6mm thick, sandbaaned SWDM 5.4.2.3
Rip Rap, machine ~laced: slooes WSDOT 9-13.1(2)
Rock Construction Entrance, 50'x15'x1' SWDM 5.4.4.1
Rock Construction Entrance, 100'x15'x1' SWDM 5.4.4.1
Sediment pond riser assemblv I SWDM 5.4.5.2
Sediment trao, 5' hlah berm I SWDM 5.4.5. 1
Sed. trap, 5' l'igh, rlprapoed spillway berm section SWDM 5.4.5.1
Seeding, by hand SWDM 5.4.2.4
Soddina, 1" deep, level around I SWDM 5.4.2.5
Sodding, 1" deep, sloped ground I SWDM 5.4.2.5
TESC Suoervisor
Water truck, dust control SWDM 5.4.7
WRITE-IN-ITEMS •••• /see nane 91
CB Protection Filter
Page 2 of 9
R.::i~.r;:iSPAond
Unit
Price Unit Quantitv
$ 5.62 CY 20
$ 67.51 Each
$ 85.45 CY
$ 8.08 CY
$ 1.50 CY 20
$ 1.38 LF
$ 1.38 LF
$ 0.59 SY
$ 1.45 SY
$ 2.01 SY 100
$ 0.53 SY
$ 10.70 LF
$ 16.10 LF
$ 20.70 LF
$ 2.30 SY
$ 39.08 CY
$ 1,464.34 Each
$ 2,928.68 Each
$ 1,949.38 Each
$ 17.91 LF
$ 68.54 LF
$ 0.51 SY
$ 6.03 SY
$ 7.45 SY
$ 74.75 HR 4
$ 97.75 HR 4
$ 100.00 Each 1
ESC SUBTOTAL:
30% CONTINGENCY & MOBILIZATION:
ESCTOTAL:
COLUMN:
#of
Aoolications Cost
1 112
1 30
1 201
1 299
1 391
1 100
$ 1,133.40
$ 340.02
$ 1,473.42
A
Unit prices updated: 02/12/02
Version: 04/22/02
Report Date: 9/8/2008
-·
GENEH/\L ITEMS
Backfil & Compaction-embankment
Backfil & Compaction-trench
Clear/Remove Brush, bv hand
Clearlna/Gruti:>lnarTree Removal
Excavation -b.Jlk
Excavation -Trench
Fenclrg, cedar 6' high
Fenclrq, chain link. vlnvl coated 5 hloh
FencilYl, chain link. aate. vlnVf coated 20'
Fenclra, solit rail, 3' hich
FIii & compact • common barrow
Fm & comoact -arave\ base
Fill & compac1 -screened toosoll
Gablon. 12" deep, stone filled mesh
Gablon. 18" deep, stone filled mesh
Gablon 36" deeo, stone filled mesh
Gradira, fine, bv hand
Gradirn, fine, with orader
Monuments, 3' lon!l
Sensit'we Areas S1an
Soddlnn, 1" deeo, slooed around
SuNeving, line & arade
Survel.Anq, lot location/lines
Traffic control crew ( 2 flanners)
Trail, 4'' chinn,:,,d wood
Trail, 4'' crushed cinder
Trail, 4'' top course
Wall, retainlna, concrete
Wall, rockery
Page 3 of 9
*KCC 27 A authoriZes only one bond reduction.
~----l'."nn.~ ... .-1
Site Improvement Bond Quantity Worksheet
Existing Future Public Private
Righi-of-Way Road Improvements lmprovements
& Drainaoe Facilities
Unit Price Unit Quant. Cost Quant. Cost Quant. Cost
$ 5.62 CY
$ 8.53 CY 45 363.85
$ 0.36 SY 100 36.00
$ 8,876.16 Acre
$ 1.50 CY
$ 4.06 CY 45 182.70
$ 18.55 LF
$ 13.44 LF
$1,271.81 Each
$ 12.12 LF
$ 22.57 CY
$ 25.48 CY
$ 37.85 CY
$ 54.31 SY
$ 74.85 SY
$ 132.48 SY
$ 2.02 SY
$ 0.95 SY 250 237.50
$ 135.13 Each
$ 2.88 Each
$ 7.46 SY
$ 788.26 Day 1 788.26
$ 1 556.64 Acre 0.1 155.66
$ 85.18 HR 8 681.44
$ 7.59 SY
$ 8.33 SY
$ 8.19 SY
$ 44.16 SF
$ 9.49 SF
SUBTOTAL 2,465.41
Quantity Completed
(Bond Reduction)"
Quant.
Complete Cost
Unit prices updated: 02/12/02
Version: 4n.2102
Report Date: 9/8/2008
Site Improvement Bond Quantity Worksheet
' . Existing Future Public Private
Right-of-way Road Improvements Improvements
& Drainaae Facilities
Unit Price Unit Quant. Cost Quant. I Cost Quant. I Cost
ROAD [MP.R.9:J_F,MEt,J_T
AC Grhdina, 4' wide machine< 1000sv $ 23.00 SY 115 2,645.00
AC Grnding. 4' wide machine 1000-2000sy $ 5.75 SY
AC Grhdin!:1, 4' wide machine > 2000sv $ 1.38 SY
AC Ranoval/Disnnsal/Reoair $ 41.14 SY
Barricade, tvne I $ 30.03 LF
Barricade tvne Ill < Permanent ) $ 45.05 LF
Curb a Gutter, rolled $ 13.27 LF
Curb a Gutter, vertlcal $ 9.69 LF 259 2,509.71
Curb iYld Gutler, demolltlon and disnosal $ 13.58 LF
Curb, extruded asphalt $ 2.44 LF
Curb, extruded concrete $ 2.56 LF
SawcU asoh!lt, 3" death $ 1.85 LF 260 481.00
SawcU, concrete, per 1" det>th $ 1.69 LF
Sea\art, asphalt $ 0.99 LF 260 257.40
Shoulder, AC, ( see AC road unit orlce) $ -SY
Shoulder, oravel, 4" thick $ 7.53 SY
Sidewalk, 4" thick $ 30.52 SY 144 4,394.88
Sidewalk, 4" thick, demolition and dlsoosal $ 27.73 SY
Sidewalk, 5" thick $ 34.94 SY
Sidewalk, 5" thick, demolition and disoosat $ 34.65 SY
Slan, handicao $ 85.28 Each
Strlcina, cer stall $ 5.82 Each
Stripln1t thermoplastic, < for crosswalk ) $ 2.38 SF
Striping, 4" reflectorlzed line $ 0.25 LF
Page 4 or 9 SUBTOTAL 10,287.99
: I
*KCC 27A authorizes only one bond reduction.
.... __ ,-("f:,t"}.~ ... ~
Bond Reduction• ,'.' ·\: --·
.. ' , .. , .. •>~;·"' ... :'.'!'"'.,'.
Quant. ...
Complete Cost
Untt prices updated: 02/12/02
Version: 4122/02
Report Date: 9/812008
.
Site Improvement Bond Quantity Worksheet
Unit Price Unit
t<OAD_ SUl3_F.I\CING /,i'' r~(y:;,f,; ~ ~ r; [1,'}SI'. :-: \ ', .. lr:p, ''lll ~<:i
For KCRS '93, (additional 2.5" base) add: $ 3.60 SY
AC Overlav. 1.5" AC $ 7.39 SY
AC Overlay, 2" AC $ 8.75 SY
AC Road, 2'', 4" rock, First 2500 SY $ 17.24 SY
AC Road, 2". 4" rock. Qtv. over 2500SY $ 13.36 SY
AC Road, 3", 4" rock, First 2500 SY $ 19.69 SY
AC Road, 3", 4" rock, Qtv. over 2500 SY $ 15.81 SY
AC Road, 5", First 2500 SY $ 14.57 SY
AC Road, 5", atv. Over 2500 SY $ 13.94 SY
AC Road, 6". Flrs1 2500 SY $ 16.76 SY
AC Road, 6". Qty. Over 2500 SY $ 16.12 SY
Asphalt Treated Base 4" thick $ 9.21 SY
Gravel Road. 4" rock, First 2500 SY $ 11.41 SY
Gravel Road, 4" rock, Otv. over 2500 SY $ 7.53 SY
PCC Road, 5", no base, over 2500 SY $ 21.51 SY
PCC Road, 6', no base, over 2500 SY $ 21.87 SY
Thickened Edge $ 6.89 LF
Page5of9 SUBTOTAL
·KCC 27A authorizes only one bond reduction.
o.,,,r,,.~Pi:l.rinrl
Existing Future Public
Right-of-way Road Improvements
& Drainage Facilities
Quant. Cost Quant. I Cost
FtJ; ·n 11,:r:n;: f I. r:· h!,,._;.., , .... !,;rs•~,,~ I 5" lqprr,tll",('\
181 651.60
894 6,606.66
181 2,418.16
9,676.42
Priyate,, .. ., ~~~:;~~r~ti.r~t-:t: .. I
Improvements
Quant.
Quant. I Cost Comolete Cost
64 230.40
64 855.04
20 137.80
1,223.24
Un~ prices updated: 02/12/02
Version: 4'22/02
Report Date: 9/8(2008
Site Improvement Bond Quantity Worksheet
Unit Price Unit
DR/\IN/\GE (C f)p :: (;.-.1 nm,1!.<!d f'l<i",li<: Pu;r•. t·J 1;; ,,i 1· ti111v;,lr,!;'. 1
Access Road, RID
Bollards -fixed
Bollards -removable
• (CBs include frame and lid)
CB T"ne I
CB Tvne IL
CB Tvoe 11, 48" diameter
for additional deoth over 4'
CB Tvne 11, 54" diameter
for additional depth over 4'
CB Tvne II, 60" diameter
for additional deoth over 4'
CB T"= 11, 7'Z' diameter
for additional depth over 4'
Throuah~curb Inlet Framework (Add)
Cleanout, PVC, 4"
Cleanout, PVC, 6"
CleanOut, PVC, 8"
Culvert, PVC, 4"
Culvert, PVC, 6"
Culvert, PVC, B"
Culvert, PVC, 12"
Culvert, CMP, B"
Culvert, CMP, 12"
Culvert, CMP, 15"
Culvert, CMP, 18"
Culvert, CMP, 24"
Culvert, CMP, 30"
Culvert, CMP, 36"
Culvert, CMP, 48"
Culvert, CMP, 60"
Culvert, CMP, 72"
Page 6 of 9
*KCC 27 A authorizes only one bond reduction.
BasraSPBond
$ 16.74 SY
$ 240.74 Each
$ 452.34 Each
$ 1 257.64 Each
$ 1 433.59 Each
$ 2 033.57 Each
$ 436.52 FT
$ 2 192.54 Each
$ 486.53 FT
$ 2 351.52 Each
$ 536.54 FT
$ 3 212.64 Each
$ 692.21 FT
$ 366.09 Each
$ 130.55 Each
$ 174.90 Each
$ 224.19 Each
$ 8.64 LF
$ 12.60 LF
$ 13.33 LF
$ 21.77 LF
$ 17.25 LF
$ 26.45 LF
$ 32.73 LF
$ 37.74 LF
$ 53.33 LF
$ 71.45 LF
$ 112.11 LF
$ 140.63 LF
$ 235.45 LF
$ 302.58 LF
SUBTOTAL
Existing
Right-of-way
Quant. Cost
;·.,,' ... ,-,,:::•··.
3 3,IT2.92
3,772.92
Future Public Private ·, . . Bond Reduction'. .. · .. . . ... '., ..
Road Improvements Improvements
& Drainage Facilities Quanl.
Quant. Cost Quant. I Cost Complete Cost
. ,·: .·· ' . :•. •,, . ·,.; ,; '·,·••:··:• , .. ,.1 .,,,,,,,! ; ·.::' ,,, ·',.•,':I·: .,-,,_<· . • •·! ·' ,,., .. ,
Unit prices updated: 02/12/02
Version: 4/22/02
Report Date: 9/8/2008
..
DRAINAGE CONTINUED
Culvert, Concrete, 8"
Culvert. Concrete, 12"
Culvert, Concrete, 15"
Culvert, Concrete, 18"
Culvert, Concrete, 24"
Culvert, Concrete, 30"
Culvert. Concrete, 36"
Culvert, Concrete 42''
Culvert, Concrete 48"
Culvert, CPP, 6"
Culvert, CPP, 8"
Culvert, CPP, 12''
Culvert, CPP, 15"
Culvert, CPP, 18"
Culvert, CPP, 24"
Culvert, CPP, 30"
Culvert, CPP, 36"
Oltchina
Flow Disoersal Trench (1,436 base+}
French Drain /3' deothl
Geotextlte, laid In trench, oolVDroovlene
Infiltration oond testino
Mid-tank Access Riser, 48" dla, 6' deep
Pond OvertloW Solllwav
Restrlctor/Oil Separator, 12"
Restrictor/Oil Separator, 15"
Restrictor/Oil Separator 18"
Riorao, olaced
Tank End Reducer (36" diameter)
Trash Rack, 12"
Trash Rack, 15"
Trash Rack. 18"
Trash Rack, 21"
Page 7 of 9
·Kee 27A authorizes only one bond reduction.
R;:i~raSPBond
Site Improvement Bond Quantity Worksheet
Existing Future Public Private
Right-of-way Road Improvements Improvements
& Drainage Facilities
Unit Price Unit Quant. Cost Quant. Cost Quant. Cost
$ 21.02 LF
$ 30.05 LF 14 420.7
$ 37.34 LF
$ 44.51 LF
$ 61.07 LF
$ 104.18 LF
$ 137.63 LF
$ 158.42 LF
$ 175.94 LF
$ 10.70 LF
$ 16.10 LF
$ 20.70 LF 129 2670.3
$ 23.00 LF
$ 27.60 LF
$ 36.80 LF
$ 48.30 LF
$ 55.20 LF
$ 8.08 CY 10 80.8
$ 25.99 LF
$ 22.60 LF
$ 2.40 SY
$ 74.75 HR
$ 1,605.40 Each
$ 14.01 SY
$ 1,045.19 Each
$ 1,095.56 Each
$ 1,146.16 Each
$ 39.08 CY 10 390.8
$ 1,000.50 Each
$ 211.97 Each
$ 237.27 Each
$ 268.89 Each
$ 306.84 Each
SUBTOTAL 3562.6
Bond Reduction•
Quant.
Complete Cost
Unit prices updated: 02/12/02
Version: 4/22/02
Report Date: 9/8/2008
.. ' ~ ..
Site Improvement Bond Quantity Worksheet
Unit Price Unit
P/\1,.KING.L,.OLSURF/\C:1.N_G
2'' AC. 2" top course rock & 4" borrow $ 15.84 SY
2'' AC. 1.5" top course & 2.5" base course $ 17.24 SY
4" select borrow $ 4.55 SY
1.5" too course rock & 2.5" base course $ 11.41 SY
W.RLTE,IN-.1.J:.El\'I_S
Mailboxes $ 800.00 EA.
EA.
LF
EA.
EA.
EA.
LF
SF
LF
LF
SUBTOTAL
SUBTOTAL (SUM ALL PAGES):
30% CONTINGENCY & MOBILIZATION:
Page 8 of 9
*KCC 27 A authorizes only one bond reduction.
B;i~raSPBnnd
GRANDTOTAL:
COLUMN:
Existing Future Public
Right-of-way Road Improvements
& Drainaoe Facilities
Quant. I Price Quant. I Cost
1 800
800.00
30,565.34
9,169.80
39,734.95
B C
Quant.
Private Bond Reduction•
lmprov:ements
Cost
D
Quant.
Comrlete Cost
1,223.24
366.97
1,590.21
E
Unit prices updated: 02/12/02
Version: 4/22/02
Report Date: 9/812008
"•.-'
•
Site Improvement Bond Quantity Worksheet
Original bond computations prepared by:
Name: Chau 3 Lot Short Plat Date: 28-Aug-08
PE Registration Number: 20734 Tel. #: 253-850-0934
Firm Name: Jaeger Engineering
Address: 9419 S. 204 Place, Kent, WA. 98031 Project No: L03S0016
ROAD IMPROVEMENTS & DRAINAGE FACILITIES FINANCIAL GUARANTEE REQUIREMENTS
Stabilization/Erosion Sediment Control (ESC)
Existing Right-of-Way Improvements
Future Public Road Improvements & Drainage Facilities
Private Improvements
Calculated Quantity Completed
Total Right-of Way and/or Site Restoration Bond·/ ..
(First $7,500 of bond• shall be cash.)
Performance Bond• Amount (A+B+C+D) = TOTAL
Redu~ed Performance Bond· Total•••
Maintenance/Defect Bond• Total
NAME OF PERSON PREPARING BOND· REDUCTION:
PERFORMANCE BOND·
AMOUNT
(A) $ 1.473.4
(B) $ :3_9,734.9
(C) $
----
(D) $ 1,590.2
(A+B) $ 41,208.4
(T) $ 42,798.6
Minimum bondJ amount is $1000.
BOND• AMOUNT
REQUIRED AT RECORDING OR
TEMPORARY OCCUPANCY•••
(E) $
TX 0.30 $ 12,839.6
(T-E) $ 42,798.6
Use larger of Tx30% or (T-E)
"NOTE: The word "bond" as used in this document means any financial guarantee acceptable to King County.
•• NOTE: KCC 27A authorizes right of way and site restoration bonds to be combined when both are required.
OR
Date:
PUBLIC ROAD & DRAINAGE
MAINTENANCE/DEFECT BOND•
(B+C) x
0.25 = $ 9,933.7
The restoration requirement shall include the total cost for all TESC as a minimum, not a maXimum. In addition, corrective work, both on-and off-site needs to be included.
Quantities shall reflect worse case scenarios not just minimum requirements. For example, if a salmonid stream may be damaged, some estimated costs for restoration
needs to be reflected in this amount. The 30% contingency and mobilization costs are computed in this quantity.
**• NOTE: Per KCC 27 A, total bond amounts remaining after reduction shall not be less than 30% of the original amount (T) or as revised by major design changes.
SURETY BOND RIDER NOTE: If a bond rider is used. minimum additional performance bond shall be ! $ 1,590.2 !(C+D)-E
REQUIRED BOND· AMOUNTS ARE SUBJECT TO REVIEW AND MODIFICATION BY ODES
Page 9 of 9
BasraSPBond
Unit prices updated: 02/12/02
Version: 4/22/02
Report Date: 9/8/2008
• •
I I·: •f ..
·' .
i ·.
I·'
' . ',,
. . .
J.AEGER ENGINEER.IN'G
9419.S. 204PLACE ~ KENT,.WASHINGTON 98031'
PHONE '(253} 850--0934 FAX (253). 850-0155
. . . ' -·. . ' ' .' . , .
March 22,2007· .
August 28, 2008 .
. . ' '
" '
. '
. SMAi..LSiTE DRAINAGE
.. ,·~ ·tECHNICAL INFQRMATION REPORT
• J
.. CHAU3LO'f.SB0RTPLAT'.
. . ·170341061bAVE. SE
. COUNTY FILE NO; L0380016 .
. L07~R022·
'·· . '.
, .
. '.,..
. 'PREPAIIBD FOR: .... . ·; .
· Ha Minh Chau.· ' ·
.· 41'<>1.'l~Oth Ave; SE.
· • Bellevue, WA. 98Qci6 .·
.· ( 425) 6;43,3993 .
' .
. PREPARED BY:.
James J., Jaeger, P.E. · . . ~ .
. .
---
. .
;
. '
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. i's . [iiiiI
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.· 0 · C . · (iiiil. . , .
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JAEGER· ENGINEERING
9419 S. 204 PLACE -KENT; WASHINGTON 98031
PHONE (253) 850-0934 FAX (253) 850-0155
March 22, 2007
August 28, 2008
· SMALL SITE DRAINAGE
TECHNICAL INFORMATION REPORT
PREPARED FOR:
Ha Minh Chau
CHAU3LOTSB0RTPLAT
17034 1061b A VE. SE
COUNTY FILE NO. L03S0016
L07SR022
4101 150th Ave. SE
Bellevue, WA. 98006
(425) 643-3993
PREPARED BY:
James J. Jaeger, P.E.
'
I. OVERVIEW
The proposed project is a 3 lot short plat located at the southeast corner
of the intersection of SE 172nd St. and 1061h Ave. SE. The property is 0.34
acres and is proposed to divide into 3 new single family lots, two lots of
approx. 4500 SF and a larger lot of approx. 5500 SF. The property is zoned
R-8. There is and existing house and carport that will be demolished and
removed. Also on the site is an gravel driveway that is connected to 1061h
Ave. SE. This driveway will also be removed. Access to the new houses
will be a joint driveway (lots 2 and 3) from 1061h Ave. SE. and single
driveway (Lot 1) from SE 172nd St.
Both of the frontage streets are currently unimproved. Both will be
improved with curb, gutter, sidewalk and pavement widening to meet the
urban sub-access road standard. The pavement widening will be
measured from the centerline of the existing pavement, rather than the
ROW centerline, per discussion with County staff. This was agreed to by
the County so that additional ROW would not be needed to construct the
necessary road width. The existing lot and future lots will be fully served
by the existing public utilities.
The site is nearly flat in the northeast corner and then begins an increasing
slope down to the southwest corner. The maximum slope near this corner
is approx. 12%. The site slopes down to both frontage streets. The site
vegetation is primarily tall grass, brush with sporadic trees and shrubs.
There is a row of fir trees along the 1061h Ave. SE frontage. There are no
sensitive areas or hazard designations within this site. This property is
basically a large existing lot on a corner of an older plat.
There are no drainage improvements on the site itself. However, there are
several culverts and ditches along the edges of both street frontages. All
of the ditches drain to an existing culvert located near the southwest
property corner. Along with the proposed new curb, gutter and
sidewalks, the applicant will install a gutter drainage system consisting of
catch basins and piping that will connect to the existing catch basin. This
new gutter system will collect all of the runoff from the half streets along
the frontage as well as the existing ditches upstream from the property.
The new lots will include a roof downspout drainage piping system that
will be connected to individual dispersal trenches. Each lot will also have
a connection stub pipe to the public drainage system for footing drains ..
The project is exempt from drainage detention and water quality
enhancement as will be shown on the developed drainage section.
.. ,
. !'
' ®
King County
Department of Development
and Environmental Services
900 Oakesdale Avenue SW
Renton, WA 98055-1219
File No.
File Name:
CONDITIONS OF APPROVAL
L03S00l6
Chau Short Plat
· Application Date: May 2, 2003
Revision Date: January 30, 2004
This short subdivision is granted preliminary approval subject to the following Conditions of
Approval. These conditions are based on a field visit and current information the applicant
has provided about the short subdivision property. Occasionally, in satisfying the Conditions
of Approval, a more definitive land use limitation of the property may be revealed. New
information (such as final Health approval or sensitive areas review) may require additional
conditions and may reduce the number of lots.
Final approval will be granted after compliance with the Conditions of Approval. Key codes
and guidelines have been noted to provide guidance in preparing the required plans and other
documents. Compliance with some of the following conditions will require that engineering
plans be prepared by a professional civil engineer licensed in the State of Washington.
I. Title 19A
A. The short subdivision shall comply with all provisions of Title 19A.
B. The final review process must be completed prior to recording of the short
subdivision. The Department of Development and Environmental Services
(DDES) strongly recommends the Final Short Plat be submitted at least one
year prior to the expiration date of the project. The Final Short Plat submittal
package includes:
1. A surveyed map page (four sets) including lot area closure calculations;
2. Final health approval from the King County Health Department ( different
from preliminary health approval);
3. A current short plat certificate and supporting documents (easements, etc.);
4. Payment of the Final Short Plat submittal fee;
5. A copy of this letter (preliminary approval letter).
A licensed land surveyor shall be hired to prepare the final short subdivision
documents. These documents shall comply with all of the following
conditions for final approval:
.•
',
C. All persons having an ownership interest in the subject property are required to
sign the final short subdivision.
D. If modifications to the approved preliminary site plan (Attachment 1) are
needed to accomplish engineering design or final short plat, then a revised
preliminary site plan shall be submitted to DDES for review and approval.
The revised site plans shall be submitted with the engineering plans or the final
short plat submittal.
2. Surface \Yater Management (KCC 9)
1998 King County Surface \Yater Design Manual (SWDM)
A. This short subdivision proposal is subject to Full Drainage Review per section
1.1.2.3. Final short subdivision approval shall require full compliance with
drainage provisions and storm drainage requirements of this section.
Compliance may result in reducing the number and/or location of lots shown
on the approved preliminary short subdivision. The conditions outlined below
are site-specific drainage conditions:
( 1) Core Requirement #1 -Discharge at the Natural Location
(2) Core Requirement #2 -Off-Site Analysis
(3) Core Requirement #3 -Flow Control
(4) Core Requirement #4 -Conveyance System
(5) Core Requiremenf#S -Erosion & Sedimentation Control
(6) Core Requirement #6 -Maintenance and Operation
(7) Core Requirement #7 -Financial Guarantees & Liability
(8) Core Requirement #8 -Water Quality
(SI) Special Requirement #1-Other Adopted Requirements
B. A professional civil engineer licensed in the State of Washington shall prepare
a Technical Information Report and/or engineering plans per Chapter 2, of the
1998 King County Surface Water Design Manual.
3. Health (KCC 13)
This project is exempt from further King County Heath Department review.
However, if improvements are required from the Sewer and/or the Water
District, then verification shall be required from said District(s) that the
improvements have been bonded and/or installed, prior to final recording of
the short plat.
,· ,·
4. Road Standards (KCC 14)
1993 King County Road Standards, Ordinance 11187
Final short subdivision approval shall require full compliance with the provisions set
forth in the King County Road Standards including engineering plans for all road
improvements. The engineering plans shall be prepared by a professional civil
engineer licensed in the State of Washington. DDES strongly recommends the
Engineering Plans be submitted at least two years prior to the expiration date of the
project.
A. That portion of the North half of SE 172nd Street adjoining the subject property
shall be improved to an urban Sub-access standard per KCRS Section 1.03.
B. That portion of the East half of I 06th Avenue SE adjoining the subject property ·
shall be improved to an urban Sub-access standard per KCRS Section 1.03.
C. Provide 35' paved radii at the intersection of 1061h Avenue SE and SE 172
Street per KCRS Section 2.10. Dedicate a 25-foot property line radius at the
intersection of I 06 1h A venue SE and SE 172°d Street per KCRS Section 2.10.
D. Existing roadside obstacle(s) shall be relocated to provide a minimum
clearance of JO feet from the edge of the travel lane to the obstacle(s) per
KCRS Section 5.11.
E. Private access to Lots 2 and 3 shall be shown as a joint-use driveway tract per
KCRS Section 3.0 I. The tract shall be an undivided ownership to the lots it
serves, and the lot owners shall be responsible for its maintenance. The tract
shall be 20-feet wide with a 18-foot-wide paved surface. The tract shall be a
minimum of 20 feet in length.
· F. The following notes shall be shown on the final recorded short subdivision:
I) \Varning: King County has no responsibility to build, improve,
maintain or otherwise service the private roads contained within or
providing service to the property described in this short subdivision.
2) All private easements and/or tracts to be maintained, repaired, and/or
rebuilt by the owners of the parcels having legal access therefrom and
their heirs, assigns or successors, unless and until such roads are
improved to King County standards and are dedicated and accepted by
King County for maintenance.
G. All utilities within proposed rights-of-way shall be included within a franchise
approved by the King County Council prior to final short subdivision
recording.
,.
"
I
H. All restrictions, easements, tracts, and their purpose shall be shown on the final
recorded short subdivision.
5. Building and Construction Standards (Title 16)
Grading. The applicant shall comply with all applicable provisions of KCC 16.82.
6. Fire Code (KCC 17)
Section 902 of the 1997 Edition of Uniform Fire Code
The applicant shall obtain the approval of the King County Fire Protection Engineer
for the adequacy of the fire hydrant, water main, and fire flow standards ofKCC 17.08
prior to recoding of the lots.
7. Zoning Code (KCC 21A)
A. Density and Dimensions (KCC 21A.12)
All lots shall meet the density and dimensions requirements of the R-8-SO
zone classification or shall be as shown on the face of the approved prelimi-
nary short subdivision, whichever is larger. Minor revisions to the short
subdivision, which do not result in substantial changes and/or do not create
additional lots may be approved at the discretion of LUSD.
B. Street Trees (KCC 21 A.16)
Street trees shall be provided along that p011ion of the right-of-way for
106 1h Avenue Southeast and Southeast 172nd Street abutting the subject
property, pursuant to the provisions of KCC 2 IA.l 6.050(E) and KCC
21 A.16.190, unless existing trees are shown to be equivalent to the
requirement of Code. See note below. The required street trees shall be
designed as to location and spacing on the final plan submittal. The street trees
must be installed and inspected, or a performance bond posted, prior to
recording of the plat. If a performance bond is posted, the street trees must be
installed and inspected within one year of recording of the plat At the time of
inspection, if the trees are found to be installed per the approved plan, a
maintenance bond must be submitted, or the performance bond replaced with a
maintenance bond, and held for one year. After one year, the maintenance
bond may be released after DDES has completed a second inspection and
determined that the trees have been kept healthy and thriving.
NOTE:
I. KCC 21A.16.050 Landscaping -street frontages. The average
width of perimeter landscaping along street frontages shall be provided as
follows:
'·,
( ... -...
~. f
•
For single-family subdivisions:
a. Trees shall be planted at the rate of one tree for every 40 feet of
frontage along a neighborhood collector street or arterial street.
b. The trees shall be: ·
I. Located within the street right-of-way if permitted by the
custodial state or local agency;
2. No more than 20 feet from the street right-of-way line when
located within a lot;
3. Maintained by the adjacent landowner unless part of a County
maintenance program; and
4. A species approved by the County if located within the street
right-of-way and compatible with overhead utility lines.
c. The trees may be spread at irregular intervals in order to
accommodate sight distance requirements for driveways and
intersections.
2. KCC 21A.l 6.190 Financial guarantees. Financial guarantees shall
be.required consistent with the provisions of Title 27A.
C. Significant Tree Retention-KCC 21A.38.230 which applies to the site, a
detailed tree retention plan shall be submitted with the engineering plans for
the subject plat. The tree retention plan (and engineering plans) shall be
consistent with the requirements ofKCC 21A.38.230, as well as the conceptual
tree retention plan which is part of the hearing record for this project. No
clearing of the subject property is permitted until the final tree retention plan is
approved by LUSD. Flagging and temporary fencing of trees to be retained
shall be provided, consistent with KCC 21A.38.230B4. The placement of
impervious surfaces, fill material, excavation work, or the storage of
construction materials is prohibited within the fenced areas around preserved
trees, except for grading work permitted pursuant to KCC 21 A.38.230B4d(2).
A note shall be placed on the final plat indicating that the trees shown to be
retained on the tree retention plan shall be maintained by the future owners of
the proposed lots, consistent with KCC 2 IA.38.230B6. (Note that the tree
retention plan shall be included as part of the final engineering plans for the
subject plat.) If there are no significant trees as defined by the Special Overlay
District on the site then, this requirement does not apply.
D. The existing house shall be removed or demolished prior to the final approval
and recording. A demolition permit shall be obtained prior to demolition.
8. Road Mitigation Payment System
; ....
l,t ·. ,,
' ', /'
The applicant shall comply with Road Mitigation Payment System (MPS), by paying
the required MPS fee as determined by King County Department of Transportation,
plus an administrative fee, The applicant has an option to either:
A, Pay the. MPS fee at final short subdivision recording and the MPS
administrative fee at final short subdivision application, or
B. Pay the MPS fee at building permit issuance and the MPS administrative fee at
the time of building permit application.
If option A is chosen, then the following note shall be shown on the final short
plat:
MPS FEE NOTICE:
All fees required by King County code 14. 75, Mitigation Payment System
(MPS) have been paid.
If option B is chosen, then the following note shall be shown on the final short
plat:
MPS FEE NOTICE:
This short plat is subject to King County Code No. 14.75, King County Road
Mitigation Payment System (MPS). The MPS fees plus the MPS
administrative fee shall be paid at the time of building permit application at
the rate in effect at that time.
9. State Environmental Policy Act (SEPA)
This short subdivision was exempt from the provision of the State Environmental
Policy Act (SEPA).
I 0. Other Considerations
Preliminary approval of this application does not limit the applicant's responsibility to
obtain any required permit or license from the State or other regulatory body. This
may include obtaining a forest practice permit from the Washington State Department
of Natural Resources for tree removal,
. 1~ LINV=381.S 1-----
,5 ' ci) ::~'"!
11 l 11 c,l BEGIN NEIi CURB,
GUTTER & SIDEIIALK
11 · '---l----lL-0', _ _J
130.01'
12• CONC, RET,
\/ALL 111TH
\IOOD FENCE
(\IALL ON PROP. LN.>
1-,-II \ 1 i3 i3:\ASPHAL T. .1 ~ u D/V AP N EX CONC.1 EX HOUSE 'u " ~~ . II · \ \ I : ? i$
l~ ~ \~, t ----'-~y--;aa-~:,, J3o) .··: \ -/ ----rE;~:~i6_---~-~""'s'="o.~---.io
rl ---/ DRIVE I 1\ CA;\ I : \ 7-,, ff] ,--JI PORT I I \ \
LDT 13
1-..J..t-41'11!..,\-~I?\~ \[) Lori'!./"' , i1---_J '
1 1 co .~ 1 /Ji_';>:, ~ I ~ LOTI # 1-:'ll ~
q \ *·/ (") I ..;: I c) v• ~ts:l/)rn\ \ o 4 190± SQ F i l/) ..s.,9e6+LSQ. FT. '.,, I e r--""--I , (3) 10' ' . I tJ..(>pfo~-S"'( <J50 , ___ ....J
M-4-.\--.. \ \a I Ex 1 HOUSE 1 _!!f ,~PINES I <REMOVE> I . I ~-. A \ \ I I I co \ EX HOUSE
c!~+.::H++-Wr+~t.:' ~-7-'-9.18~' \ ~ -\ -t; \f ~ ? ~ ---
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4.594± SQ. F~~ ~r 5e:i , 0:...
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FIR ·TREES ' I
. N~~Lfl~r°~\,'~R "'\., ~D NEIi c11
B, GUTTER
' ...,.-25' ROIi R & SJIJ8,/ALK
v-"'&
R!=LDCA TED F.fl. 6 '-~-
12' RCP
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EX ilJTC+i'
EDGE OF PAVEMEt
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Transmitted to the following Parties of Record for short plat L03S0016:
Cramer Northwest Inc.
945 N. Central Ave., Suite #104 Kent, WA 98032
Mr. & Mrs. G.A. Headland
17030 106'h Ave SE Renton, WA 98055
Jay Newton
17006 106u, Ave SE Renton, WA 9805 5
Trishah Bull, Project Manager II, DDES Land Use Services Division
Curt Foster, Sr. Engineer, DDES Land Use Services Division
Mazen Haidar, Engineer, DDES Land Use Services Division
Rich Hudson, Program Manager III, DDES Land Use Services Division
...
•
ATTACHMENT A
RIGHT TO APPEAL
This action may be appealed in writing to the King County Hearing Examiner, with a fee
of$250.00 (check payable to King County Office of Finance).
As required by KCC 20.20.090 and 20.24.090, the appeal period shall be fourteen (14)
calendar days and shall commence on the third day after the notice of decision is mailed.
Filing an appeal requires actual delivery to the King County Land Use Services Division
prior to the close of business (4:30 p.m.) on the date due. Prior mailing is not sufficient if
actual receipt by the Division does not occur within the applicable time period. The
Examiner does not have authority to extend the time period unless the Division is not
open on the specified closing date, in which event delivery prior to the close of business
on the next business day is sufficient to meet the filing requirement.
If a timely Notice of Appeal has been filed, the appellant shall file a statement of appeal
within a 21-day calendar period commencing three days after the notice of decision is
mailed. The statement of appeal shall identify the decision being appealed (including file
number) and the alleged errors in that decision.
The statement of appeal shall state: 1) specific reasons why the decision should be
reversed or modified; and 2) the harm suffered or anticipated by the appellant, and the
relief sought. The scope of an appeal shall be based on matters or issues raised in the
statement of appeal. Failure to timely file a notice of appeal, appeal fee, or statement of
appeal deprives the Exan1iner of jurisdiction to consider the appeal.
Appeals must be submitted to the Department of Development and Environmental
Services, addressed as follows:
LAND USE APPEAL
Land Use Services Division
Department of Development and Environmental Services
BlackRiver Corporate Park
900 Oakesdale Avenue Southwest
Renton, WA 98055-1219
A request for a pre-hearing conference may be made by any party. For more infomrntion
regarding appeal proceedings and pre-hearing conferences, please contact the Office of
the Examiner for a Citizens' Guide to the Examiner hearings and/or read KCC 20.20 and
20.24.
. -•
'
PROJECT INFORMATION
Proposal: Short Plat
Location: 17034 106th Avenue SE
Renton, Washington 98055
Owner: Ha Chau
Area: Approximately .33 acre
1)0LUN~f\l\..
DF-.~,l'-l.~
Soils: AgC (Alderwood gravelly sandy loam)
Legal Description: Lot 13, Block 4, Aker's Farms No. 5
Volume 40, Page 27
Tax Parcel No: 008700-0280-07
PROJECT DESCRIPTION
This project proposes to subdivide approximately 1/3 acre ofland into 3 (three) lots.
Presently there is a single family residence with carport located at the north side of the
parcel. As a result of the subdivision, the existing house will be partially or entirely
demolished.
The ground consists of la-wn, three pine trees in the front yard, a row of small fir trees
along the west property line, and a gravel driveway. The parcel is bordered by S.E. l 72"d
Street along the south side, and by I 06th Avenue S.E. along the west side.
Attached are site pictures, a vicinity map, a soils map, U.S.G.S. aerial topography map,
and a schematic storm drainage plan. These enclosures were used in this analysis as
resources.
DOWNSTREAM ANALYSIS
The ground of the parcel slopes from northeast comer down to southeast comer at a
moderate slope of ten ( l 0) percent. The sheet flow from the parcel is collected by the
ditches along the south and west property lines. Both of these ditches are located in the
public right-of-way and meet outside of the southwest comer of the property. The west
side and south side ditches are connected via eighteen (18) inch and twelve (12) inch
diameter short culverts, respectively, into a catch basin located in the northeast comer of
the intersection.
There is a twelve (12) inch diameter outgoing reinforced concrete pipe culvert from the
catch basin running diagonally across the intersection at an approximate slope of7.7%.
Page I of2 ct:s
This culvert daylights into a wooded ravine that continues to slope down in a
southwesterly direction until it becomes a roadside ditch for the State Route 515 (Talbot
Road), at a point at least a Y. mile from the proposed subdivision. There are no evident
signs of erosion or capacity problems within this existing downstream storm drainage
conveyance system. Eventually the runoff from the property is part of the Panther Creek
Wetland that is drained into Lake Washington via Green River.
A site visit to verify these conditions was made on March 6, 2003, by CTS Engineers,
Inc.
PROPOSED SITE DRAINAGE IMPROVEMENTS
Each ditch on the south and west of the subject property currently outlets via a short
culvert which connects to an existing catch basin at the NE comer of the intersection of
I 06th Ave SE and SE 172nd St. As part of the access improvements to the subdivided
property, it is proposed to replace both existing ditches with culverts, filling each ditch to
the level of street pavement. In addition, the existing catch basin is proposed to be
replaced with a larger catch basin or storm drain manhole. Site drainage and storm runoff
will be directed into below-grade pipes which will connect to the proposed culverts
upstream of the replaced catch basin.
Refer to the attached preliminary storm drainage plan for a graphical representation of the
proposed improvements.
Page 2 of2 ct:s
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'-"1-l, '"' e. , r-rre:.µt tt-L '2-':> r eii.--r.
II. PEAK RUNOFF FLOWS
A. PREDEVELOPED DRAINAGE
The pre-developed drainage basin includes the entire subject property
plus a portion of the two frontage roads. T,he frontage road areas were
included because the proposed curb. gutter and sidewalk will add new
impervious surface that must be accounted for in the drainage
calculations. The on-site area was calculated to be 0.34 acres. The area
of the frontage road improvements was determined using only the area
from the edge of the existing pavement to the ROW line. The existing road
pavement was not included in the calculations because this area will not
be changed. The frontage area was calculated to be 3982 SF. or 0.09
acres. This provided a total project area of 0.43 acres. The existing house
and gravel driveway also presented existing impervious surface. This
existing impervious surface was calculated to be 0.07 acres. Note that
only 50% of the gravel driveway was counted as impervious surface. per
code. The remaining pre-developed area was considered till pasture.
The pre-developed drainage analysis was performed using the "KCRTS"
< '
hydrology software and its summary tables and charts are attached for
reference. The methods outlined in the 1998 King County Surface Water
Design Manual were used as guidelines. Following this page are the data
sheets used for the computer input data. The computer summary sheets
for peak flows are also attached. Below is a brief description of the
existing drainage characteristics:
2 year peak flow:
10 year peak flow:
100 year peak flow:
project area:
till pasture:
impervious area:
0.024 CFS
0.040 CFS
0.076 CFS
0.43 acres
0.36 acres
0.07 acres
CHAU SHORT PLAT
KCRTS PEAK FLOW SUMMARY
PRE-DEVELOPED DRAINAGE
Flow Frequency Analysis
Time Series File:chaupre.tsf
Project Location:Sea-Tac
---Annual Peak Flow Rates--------Flow Frequency Analysis-------
Flow Rate Rank Time of Peak -Peaks Rank Return Prob
(CFS) (CFS) Period
0.037 4 2/09/01 15:00 0.076 1 100.00 0.990
0.024 6 1/05/02 16:00 0.042 2 25.00 0.960
0.042 2 2/27/03 7:00 0.040 3 10.00 0.900
0.019 8 8/26/04 2:00 0.037 4 5.00 0.800
0.024 7 1/05/05 8:00 0.037 5 3.00 0.667
0.040 3 1/18/06 16:00 0.024 6 2.00 0.500
0.037 5 11/24/06 3:00 0.024 7 1. 30 0.231
0.076 1 1/09/08 6:00 0.019 8 1.10 0.091
Computed Peaks 0.065 50.00 0.980
1-..
'
:: 0,43 Ac-.
2..497 SE
3 Sr
= o.o
s'><,s"'i N. c.,. e~J.i.-..c=US""'-----------------
a..) ( )s:e.. TIii I f93±uce..
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,0
=
11
B. DEVELOPED DRAINAGE
The developed drainage calculations used the same project area as the
pre-developed calculations. The impervious surfaces included the 3 new
houses. 3 new driveways, the joint use driveway and the frontage
improvements for 1061h Ave SE and Se 172nd St. The applicant provided
specific house plans for the three new lots. The footprint for these specific
houses was uses as the impervious surface area for the new houses at
each Jot. These areas are shown on the attached worksheet. A driveway
for each Jot was also calculated using the site plan that was provided by
the applicant. The areas for the driveways were taken directly from the
plan for each new lot. The joint use driveway was calculated to cover the
"worse" condition of extending the full length of the common lot line
between Lots 2 and 3. The required pavement with of 18 ft. was used.
The frontage improvement impervious surface includes the new sidewalk.
curb and pavement widening. The pavement widening width was
calculated using an average width of the additional pavement for both
streets. The developed pervious surface was considered as till lawn.
Similar to the existing condition. the KCRTS method was used to determine
the peak flows for the various storm events. The computer data sheets for
the developed flows follow this page. A brief summary of the developed
drainage characteristics are:
2 year peak flow:
10 year peak flow:
100 year peak flow:
total area:
till lawn:
impervious area:
0.075 CFS
0.091 CFS
0.153 CFS
0.43 acres
0.19 acres
0.24 acres
..
Time
CHAU SHORT PLAT
KCRTS PEAK FLOW SUMMARY
DEVELOPED DRAINAGE
Flow Frequency Analysis
Series File:chaudev.tsf
Project Location:Sea-Tac
---Annual Peak Flow Rates--------Flow Frequency Analysis-------
Flow Rate Rank Time of Peak -Peaks Rank Return Prob
(CFS) (CFS) Period
0.075 6 2/09/01 2:00 0.153 1 100.00 0.990
0.060 8 1/05/02 16:00 0.092 2 25.00 0.960
0.091 3 2/27/03 7:00 0. 091 3 10.00 0.900
0.063 7 8/26/04 2:00 0. 079 4 5.00 0.800
0.076 5 10/28/04 16:00 0.076 5 3.00 0.667
0.079 4 1/18/06 16:00 0.075 6 2.00 0.500
0:092 2 10/26/06 0:00 0.063 7 1. 30 0.231
0.153 1 1/09/08 6:00 0.060 8 1.10 0.091
Computed Peaks 0.133 50.00 0.980
----+11c---------\.=--=tW~oBr ~L~~---------
------+!4------~b~SN=-.,__,E.l_D= E~~~IN~P>:rG~E _______ _
II
II
2-, 111
~·.
Ill &(\I :0)-1-v,. D(j_±o)-t----'-· -------__.iall:.6a....a4-t3'-"'-__ _
II! ~ LI\ ""7 ---~"----~e-v,,___.w~~-~'~:ro~.~10='-'~:s:~·, ____ _,_/ ~'-' o ::s:F
-------;-;,lfl, _________________ --=-=-·o_, "-+ Ac..-.
Ill ,,I
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I ii .I,
1;;
l 'I I,
Ill
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()re_c.._ ::: 0, t 3. -o_._Z..~4:_-__ 0-,~ l_°t~~f±~c_~,~-
--~4--l-:t~R~a..."'-'-'-'"'-'--'~~'__,_,_;:Jr-~~-·· __________ _
Iii fo-d:oc ·, I . o
Ill
sill
Ill
Ill 2... r = . 0-15' CFS"'
---~11-,-1 -----"'.::1--)_0_~-'1'--· _» ___ o_._o'i_1_~C-F=~S ______ _
111 c lou ::-JV-· :: 0, r 53 u=-s
111 • , ---~1,-1 --------------------------
Iii ----+II _______ _
C. HYDROLOGIC ANALYSIS
The site qualifies for an exemption from Core Requirement #3. Flow
Control. Exemption #3 (page 1-27. attached) is met. This is the peak flow
exemption using flow control BMP's. The 100 year peak developed flow is
0.153 CFS. The 100 year peak pre-developed flow is 0.07 6 CFS. The
difference is 0.077 CFS. which is less than 0.1 CFS limit to qualify for this
exemption. In addition. the site is a re-development project and is not
located within a critical drainage area or a landslide hazard drainage
area. The project is a single family residential project; also needed to
qualify for this exemption.
The flow control BMP used for this project is individual lot dispersal
trenches. Individual lot infiltration is not an alternative because the soils
are of the Alderwood series (hydrologic group CJ. These soils have slow
permeability rates and high ground water.
The site qualifies for small site drainage review since the net new
impervious surface is less than 10.000 SF. The new impervious from the
development of the site and the 3 lots is 10.710 SF. The existing impervious
surface to be removed is 2,940 SF. The net new impervious surface is 7.770
SF.
D. WATER QUALITY CONTROL
The site also qualifies for an exemption from Core Requirement #8, Water
Quality. Exemption# 1. surface area exemption (page 1-50, attached) is
met. The developed site will be adding less than 5000 SF of new
impervious surface subject to vehicular traffic (PGISJ. The new PGIS area
includes the 3 new driveways for each lot. the joint use driveway and the
pavement widening along both frontage roads. The totals for these
areas are:
• 3 driveways: 546 SF
• joint driveway: 1080 SF
• 106 Ave. widening: 708 SF
• 172 St. widening: 140 SF
TOTAL: 2474 SF
This does not count the existing gravel driveway that is being removed
(credit for 50% of the area). This does show that the project meets the
requirements for the surface area exemption.
l.:!.3 CORE REQUIREME.'-7 #3: FLOW CO:\"ffiOL
0 EXEMPTIONS FROM CORE REQUIREMENT #3
There are eight possible exemptions from the requirement to provide a formal now control facility per
Core Requirement #3. The intent of these exemptions is to provide for situations where a facility may not
be practical or needed, where other alternatives to a facility can be just as effective, or where it makes
sense to provide incentives for retaining native vegetation or for maximizing use of existing developed
areas.
1. Impervious Surlace Exemption
A proposed project or any threshold discharge area within a project is exempt if less than 5,000
square feet of new impervious surface will be added and the project or threshold discharge area is not
within a Landslide Hazard Drainage Area." If the project or threshold discharge area is located
within a Landslide Hazard Drainage Area, this exemption only applies to new impervious surface Jess
than 2,000 square feet.
2. Impervious Surface Exemption Using Flow Control BMPs
Any threshold discharge area within a proposed project is exempt if less than 10,000 square feet of
new impervious surface will be added, AND all of the following criteria are met:
a) The area cleared to accommodate the proposed project must be less than 35% or less than 2 acres
of the threshold discharge area (whichever is greater), AND
b) If the project is a single family residential project, flow control BMPs must be applied within
the threshold discharge area as specified in Small Site Drainage Requiremenrs (detached
Appendix C), AND
c) · For projects other than single family residential projects, the new impervious surface within
· the threshold discharge area must be comprised of either non-pollution-generating roofs that
comply with the roof downspout controls in Section 5.1. OR roads, trails, or driveways that
comply with the rural roadway dispersion requirements in Section 5.2. l, AND
d) The manner in which runoff is discharged from the project site must not create a significant
adverse impact per Core Requirement# I.
3. Peak Flow Exemption Using Flow Control BMPs
An)' threshold discharge area within a proposed project is exempt if the project improvements within
the threshold discharge area generate less than a 0.1 cfs increase in the existing site conditions"' l 00-
year peak flow rate, M'D all of the following criteria are met:
a) If the project is a redevelopment project, flow control BMPs must be applied as specified in
Section 5.2, and the project improvements must not significantly impact a "severe erosion
problem" or "severe flooding problem" (see page 1-21), and must not be located within a
Landslide Hazard Drainage Area, AND
b) If the project is a single family residential project, the runoff from impervious surfaces must be
infiltrated or dispersed using flow control BMPs specified in Appendix C, and any areas of native
31 landslide Hazard Drainage Areas are delineated on a map adopted with this manual (see map pocket on inside of back
cover).
32 Existing site conditions depend on what. if any, land conversion activity has occurred on the site since May 1979 when King
County first required flow control on developments adding more than 5,000 square feet of new impervious surface. IF a
drainage plan has been approved by the County since tv',ay , 979 for any land conversion activity which includes the addition of
more than 5,000 square feet of new impervious surtace, THEN existing site conditions are those created by the site
improvements and drainage facilities ·constructed per >he approved engineering plans. OTHERWISE, existing site conditions
are those that existed prior to May 1979 as determined from aerial photographs and, if necessary, on knowledge of individuals
familiar with the area. The intent is to mitiga1e unaC:dressed impacts created by site alterations or improvements, such as
clearing, which have occurred since May 1979. '
1998 Surface Water Design Manual 9/J/98
1-li
ii.
SECTION 1.2 CORE REQL'IREME.',TS
9/1 /98
vegetation assumed not to be cleared for the purposes of computing the increase in 100.year peak
flow must be preserved within a tract or by covenant as described in Appendix C, AND
c) For projects other than rede,·elopment projects and single family residential projects, the
new impervious surface within the threshold discharge area must be comprised of either non-
pollution-generating roofs that comply with the roof downspout controls in Section 5.1, OR roads,
trails, or driveways that comply with the rural roadway dispersion requirements in Section 5.2.1,
AND
d) The manner in which runoff is discharged from the project site must not create a significant
adverse impact per Core Requirement #1.
4. Peak Flow Exemption for Urban Redevelopment Projects
Any natural discharge area of a redevelopment project located within the Urban Growth Area is
exempt if the project improvements within the natural discharge area generate less than a 0.1 cfs
increase in the existing site conditions I 00-year peak flow, M"D all of the following criteria are met:
a) The application of this exemption to narural discharge areas within a proposed project must not
result in more than a 0.4 cfs increase in the existing site conditions I 00-year peak flow rate for any
threshold discharge area of the project, AND
b) Flow control BMPs must be applied to the runoff from new impervious surfaces as specified in
Section 5.2.1, AND
c) The project improvements within the natural discharge area must not be located within a
Landslide Hazard Drainage Area and must not significantly impact a "severe erosion problem"
or "senre flooding problem" (see page 1-21 ), AND
d) . The manner in which runoff is discharged from the project site must not create a significant
adverse impact per Core Requirement #1.
5. -Forested Open Space Exemption for Rural Residential Projects
Any natural discharge area within a proposed rural residential project (zoned RA-2.5, RA-5, RA-I 0,
or RA-20) is exempt if all of the following criteria are met:
a) At least 659' of the unsubmerged porrion" of the natural discharge area will be set aside as
forested.open space as specified in Section 5.2.1, AND
b) The runoff from new impervious surfaces within the natural discharge area will be dispersed over
native vegetation using the flow control BMPs detailed in Section 5.2.1, A.1\"D
c) The manner in which runoff is discharged from the project site will not create a significant
adverse impact per Core Requirement #1.
6. Direct Discharge Exemption
Any natural discharge area within a proposed project is exempt if it drains to one of the "major
receiving waters" listed in Table 1.2.3.B, AND meets all of the following criteria for direct
dischargeJ.C to thit receiving water:
a) The flowpath from the project site discharge point to the edge of the l 00-year floodplain of the
major receiving water shall be no longer than a quarter mile, except for discharges to Lake
Sammamish, Lake Washington, and Puget Sound, AND
b) The conveyance system between the project site and the ordinary high water line of the major
receiving water shall be comprised of manmade conveyance elements (pipes, ditches, outfall
33 Unsubmerged portion means any portion outside the ordinary high water line of str_eams, lakes, and wetlands.
34 Direct discharge means undetained discharge from a proposed project to a •major receiving water."
1998 Surface Water Design Manual
1-28
SECTION 1.2 CORE REQUIREMENTS
>
9/1/98
• Special Requirement #5: Oil Control, Section 1.3.5 (p. 1-62)--This requirement applies special oil
controls to those projects proposing to develop or redevelop a high-use site.
Key Definitions
• Pollution-generating impenious surface (PGIS) Definition: Those impervious surfaces considered
to be a significant source of pollutants in stormwater runoff. Such surfaces include those which are
subject to vehicular use" or storage of erodable or leachable materials, wastes, or chemicals," and
which receive direct rainfall or the run-on or blow-in of rainfall.'' Metal roofs are also considered to
be PGIS unless they are treated to prevent leaching.
• Pollution-generating penious surface (PGPS) Definition: Any non-impervious surface with
vegetative ground cover subject to use of pesticides and fenilizers. Such surfaces include. but are not
limited to, the lawn and landscaped areas of residential or commercial sites, golf courses, parks and
spons fields.
D EXEMPTIONS FROM CORE REQUIREMENT #8
There are five possible exemptions from the requirement to provide a formal water quality facility per
Core Requirement #8:
1. Surface Area Exemption
A proposed project or any threshold discharge area within a project is exempt if it meets all of the
following criteria: ·· ·
a) Less than 5,000 square feet of new PGIS'' will be added. AND
b) Less than 5,000 square feet of contiguous PGIS"' will be created through any combination of new
and/or replaced impervious surface as pan of a redevelopment project, MTI
c) Less than I acre of contiguous PGPS"' will be added and/or modified," OR there is a formal
· agreement with King County to implement a landscape management plan53 for the PGPS areas on
the site (or a farm management plan in the case of an agricultural land use).
46 A surlace, whether paved or not, shall be considered subject to vehicular use if it is regularly used by motor vehicles. The
follo'Ning are considered regularly-used surfaces. roads, unvegetated road shoulders, bike lanes within the traveled lane of a
roadway, driveways, parking lots, unfenced firetanes, diesel equipment storage yards, and airport runways. The following are
not considered regularly-used surtaces: road shoulders primarily used for emergency parking, paved bicycle pathways, bicycle
lanes adjacent to unpaved or paved road shoulders primarily used for emergency parking, fenced firelanes, and infrequently
used maintenance access roads.
47 Erodable or Jeachable materials, wastes, or chemicals are those substances which, when exposed to rainfall. measurably alter
the physical or chemical characteristics of the rainfall runoff (examples include erodable soil, uncovered process wastes,
manure, fertilizers, oily substances, ashes, kiln dust, garbage dumpster leakage, etc.).
48 A covered parking area would be considered pollution-generating if runoff from uphill could regularty run through it, or if rainfall
could regularty blow in and wet the paverr.ent surface. The same par1<ing area would not be included if it were enclosed by
walls or if a low wall and berm prevented stormwater from being blown in or from running onto the covered area.
49 New PG!S means new impervious surface (as defined on page i--4) that is pollution-generating.
5° Contiguous PGIS means a discrete patch of PGIS that is all together as opposed to being separated in ditterent locations on
the project site. As used in this and other exemptions, the intent is to apply Core Requirement #8 to those redevelopment
projects that are replacing and/or adding enough impervious surface in one location to allow for opportune installation of a
water quality facility.
51 Contiguous PGPS means a patch of PGPS that is all together as opposed to being separated in different locations on the
project site.
52 Modified PGPS means any existing PGPS that is re-graded or re-contoured by the proposed project.
53 Landscape management plan means a King County approved plan for defining the layout and long-term maintenance of
landscaping features to minimize the use of pesticides and fertilizers, and to reduce the discharge of suspended solids and
other pollutants. Guidelines for preparing landscape management plans can be found in Reference Section 4-A. Submittal
requirements are detailed in Section 2.3. 1.4.
1998 Si.:rface Water Design ~1::i.nua.l
1·50
Site Improvement Bond Quantity Worksheet
King County Department of Development & Environmental Services
900 Oakesdale Avenue Southwest
Renton, Washington 98055-1219
Project Name: Chau 3 Lot Short Plat
Location: 17034106th Ave. SE
Clearing greater than or equal to 5,000 board feet of timber?
------~ yes XXXXXXXXX no
If yes,
Forest Practice Permit Number: ---------
(RCW 76.09)
Page 1 of 9
l
.. ,
R~c:r~SPRond
Date: 28-Au.9.-08
Project No.: L03S0016
Activity No.: L07SR022
Note: All prices include labor, equipment, materials, overhead and
profit. Prices are from RS Means data adjusted for the Seattle area
or from local sources if not included in the RS Means database.
./
Unit prices updated; 02/12/02
Version: 04/22/02
Report Date: 9/8/2008
Site Improvement Bond Quantity Worksheet
Reference#
EROSION/SEDIMENT CONTROL
Backfill & compaction-embankment
Check dams, 4" minus rock SWDM 54.6.3
Crushed surfacing 1 1/4" minus WSDOT 9-03.9(3)
Ditching
Excavation-bulk
Fence, silt SWDM 5.4. 3.1
Fence, Temporary (NGPE)
Hydroseedina SWDM 5.4.2.4
Jute Mesh SWDM 5.4.2.2
Mulch, bv hand, straw, 3" deep SWDM 5.4. 2.1
Mulch, by machine, straw, 2" deep SWDM 5.4. 2.1
Piping, temoorarv, CPP, 6"
Pipino, temoorarv, CPP, 8"
Pipina, temporary, CPP, 12"
Plastic coverina, 6mm thick, sandbaoaed SWDM 5.4.2.3
Rip Rap, machine placed; slopes WSDOT 9-13.1(2)
Rock Construction Entrance, 50'x15'x1' SWDM 5.4.4.1
Rock Construction Entrance, 100'x15'x1' SWDM 5.4.4.1
Sediment oond riser assembly I SWDM 5.4. 5. 2
Sediment trap, 5' high berm I SWDM 54.5.1
Sed. trap, 5' high, rlprapnM spillway berm section SWDM 54.5.1
Seeding, by hand SWDM 5.4.2.4
Soddino, 1" deep, level around I SWDM 54.2.5
Sodding, 1" deeo, slooed around I SWDM 5.4. 2. 5
TESC Supervisor
Water truck, dust control SWDM 5.4.7
WRITE-IN-ITEMS •**• !see oaae 91
CB Protection Filter
Page 2 of 9
Ai:t~rnSPAond
Unit
Price Unit Quantltv
$ 5.62 CY 20
$ 67.51 Each
$ 85.45 CY
$ 8.08 CY
$ 1.50 CY 20
$ 1.38 LF
$ 1.38 LF
$ 0.59 SY
$ 1.45 SY
$ 2.01 SY 100
$ 0.53 SY
$ 10.70 LF
$ 16.10 LF
$ 20.70 LF
$ 2.30 SY
$ 39.08 CY
$ 1,464.34 Each
$ 2,928.68 Each
$ 1,949.38 Each
$ 17.91 LF
$ 68.54 LF
$ 0.51 SY
$ 603 SY
$ 7.45 SY
$ 74.75 HR 4
$ 97.75 HR 4
$ 100.00 Each 1
ESC SUBTOTAL:
30% CONTINGENCY & MOBILIZATION:
ESCTOTAL:
COLUMN:
#of
Annlications Cost
1 112
1 30
1 201
1 299
1 391
1 100
$ 1,133.40
$ 340.02
$ 1,473.42
A
Unit prices updated: 02/12/02
Version: 04/22/02
Report Date: 9/8/2008
-I
Site Improvement Bond Quantity VVorksheet
Existing Future Public Private
Right-of-Way Road Improvements Improvements
& Drainaae Facilities
Unit Price Unit Quant. Cost Quant. Cost Quant. Cost
(.;ff.Jl:.IU\1_ 1 rFMS
Backfil & Compaction-embankment $ 5.62 CY
Backfil & Compactlai-trench $ 8.53 CY 45 383.85
Clear/Remove Brush, b\l hand $ 0.36 SY 100 36.00
Clearl,,..,/Grubblru:i/Tree Removal $ 8,876.16 Acre
Excavation -b.Jlk $ 1.50 CY
Excavation -Trench $ 4.06 CY 45 182.70
Fenclrn, cedar, 6' hlah $ 18.55 LF
Fenctrn, chain link vinyl coated, 6 high $ 13.44 LF
Fenclf"Q, chain link, gate. vlnv1 coated 2fJ $ 1,271.81 Each
Fencl!'(], sclit rall, 3' hlah $ 12.12 LF
FIU & compact -common barrow $ 22.57 CY
Flll & compact -aravel base $ 25.48 CY
Ftll & comoacl -screened tnnsoll $ 37.85 CY
Gablon. 12 .. deeo. stone filled mesh $ 54.31 SY
Gablon, 18" deeo. stone filled mesh $ 74.85 SY
Gablon 36"' deeo, stone filled mesh $ 132.48 SY
Gradln:::i, fine, by hand $ 2.02 SY
Gradin:J. nne, with grader $ 0.95 SY 250 237.50
Monuments, 3' lono $ 135.13 Each
SensilNe Areas Slan $ 2.88 Each
Soddinn, 1" deeo, stooed around $ 7.46 SY
Surve\o'lno, line & grade $ 788.26 Dav 1 788.26
Survey'lnQ, lot locatlon/llnes $ 1,556.64 Acre 0.1 155.66
Traffic control crew ( 2 nanners ) $ 85.18 HR 8 681.44
Trail, 4" ch\nnPd wood $ 7.59 SY
Trail, 4" crushed cinder $ 8.33 SY
Trall, 4' top course $ 6.19 SY
Wall retalnlna. concrete $ 44.16 SF
Wall, rockery $ 9.49 SF
Page 3 of 9 SUBTOTAL 2,465.41
·KcC 27 A authoriZes only one bond reduction.
. --'"'nn ..... .-1
Quantity Completed
(Bond Reduction)*
Quant.
Comclete Cost
Unit prices updated: 02/12102
Version: 4f22102
Report Date: 9/8/2008
Site Improvement Bond Quantity Worksheet
Existing Future Public Private
Rlght-01-way Road Improvements Improvements
& Oralnaoe Facllltles
Unit Price Unit Quant. Cost Quant. Cost Quant. I Cost
IWf\ll lf,1PIWVEMU•Jl
AC GrhdinA, 4' wide machine< 1ooosv $ 23.00 SY 115 2,645.00
AC Grhdino, 4' wide machine 1000·2000sv $ 5.75 SY
AC Grhdina, 4· wide machine > 200Qsv $ 1.38 SY
AC RenovaVOisnosal/Repalr $ 41.14 SY
Barricade, t\([')p I $ 30.03 LF
Barricade tvnP Ill ( Permanent ) $ 45.05 LF
Curb a Gutter, rolled $ 13.27 LF
Curb a Gutter, vertical $ 9.69 LF 259 2,509.71
Curb aid Gutler, demolltlon and dlsnnsal $ 13.58 LF
Curb, extruded asphalt $ 2.44 LF
Curb, extruded concrete $ 2.56 LF
Sawci..t asphalt, 3" depth $ 1.85 LF 260 481 .00
Sawcl.i concrete, ruir 1" deDth $ 1.69 LF
Sealart. asohalt $ 0.99 Lf 260 257.40
Shoulder, AC, < see AC road unit orlce l $ . SY
Shoulder, gra"lel, 4" thick $ 7.53 SY
Sidewalk, 4" thick $ 30.52 SY 144 4,394.88
Sldewalk, 4" thick, demolition and dlsoosal $ 27.73 SY
Sidewalk, 5" thick $ 34.94 SY
Sidewalk, 5" th1ck, demolltlon and dlsoosal $ 34.65 SY
Slon. handicap $ 85.28 Each
Strlolna, n11or stall $ 5.82 Each
Strlolng, thermoolastlc, l for crosswalk) $ 2.38 SF
Striping, 4" ref\ectortzed line $ 0.25 LF
Page 4of 9 SUBTOTAL 10,287.99
: I
*KCC 27A authoriZes only one bond reduction.
"'--·-t"r,n,~ ... r1
Bond Reduction*
Quant.
Complete Cost
;
Unit prices updated: 02/12/02
Version: 4/22/02
Report Date: 9/8/2008
Site Improvement Bond Quantity Worksheet
Existing Future Public Private
Right-of-way Road Improvements Improvements
& Dralnaqe Facilities
Unit Price Unit Quant. I Cost Quant. Cost Quant. I Cost
1~0/\0 ~-;ur-:F/\r.lMC. I ,J'" !-'.n• ,I,, · :• ! , I,.:'.,'. :: 1 ', .. 11 •I , < ,·,1 !I"··•• 1 ! ,,f ··,•.\·:;. I• ·:·, •• i ' " I· , ; .. :; 1 ,·;· 1 .... , ""'' .. ,
For KCRS '93. (additional 2.5"' base} add: $ 3.60 SY 181 651.60 64
AC Overlay, 1.5" AC $ 7.39 SY 894 6,606.66
AC Overlav, TAC $ 8.75 SY
AC Road, 2", 4" rock, First 2500 SY $ 17.24 SY
AC Road, 2", 4" rock Qty. a.er 2500SY $ 13.36 SY 181 2,418.16 64
AC Road, 3M, 4" rock, First 2500 SY $ 19.69 SY
AC Road, 3", 4" rock. Otv. over 2500 SY $ 15.81 SY
AC Road, 5", First 2500 SY $ 14.57 SY
AC Road, 5", Qty. Over 2500 SY $ 13.94 SY \.,
AC Road, 6", First 2500 SY $ 16.76 SY
AC Road, 6", Qtv. Over 2500 SY $ 16.12 SY
Asphalt Treated Base 4" thick $ 9.21 SY
Gravel Road, 4" rock, First 2500 SY $ 11 .41 SY
Gravel Road, 4" rock. Qtv. over 2500 SY $ 7.53 SY
PCC Road, 5", no base, over 2500 SY $ 21.51 SY
PCC Road, D, no base over 2500 SY $ 21.87 SY
Thickened Edge $ 6,89 LF 20
Page 5 of 9 SUBTOTAL 9,676.42
·KCC 27A authorizes only one bond reduction.
"""r:::oC::PAr,nri
. Bond Reduction~
Quant.
Comolete Cost
230.40
855.04
!
137.80
1,223.24
Unit prices updated: 02/12/02
Version: 4/22/02
Report Date: 9/B/2008
• "
Site Improvement Bond Quantity Worksheet •
Unit Price Unit
IJl~/\1N/\CF 1 (,I >1' -i':, •1111' 1.1\,,,! j 'I, ,•Ji, ! ·:; 1' • t ! l ', •I I • t• II , ·.I···,!,
Access Road, RID $ 16.74
Bollards -fixed $ 240.74
Bollards -removable $ 452.34
• {CBs include frame and lid\
CB Tv= I $ 1 257.64
CB Tvoe IL $ 1 433.59
CB Tvoe II, 48N diameter $ 2,033.57
for additional deoth over 4' $ 436.52
CB Tvne II, 54N diameter $ 2 192.54
for additional depth over 4' $ 466.53
CB Tvne II. 60" diameter $ 2351.52
for additional decth over 4' $ 536.54
CB Tvoe II 7'l' diameter $ 3 212.64
for addltlonal depth over 4' $ 692.21
Throuah-curb Inlet Framework {Add) $ 366.09
Cleanout, PVC, 4N $ 130.55
Cleanout, PVC, 6" $ 174.90
Cleanout, PVC, 6" $ 224.19
Culvert PVC, 4" $ 8.64
Culvert, PVC, 6" $ 12.60
Culvert, PVC, 6" $ 13.33
Culvert, PVC, 1 Z' $ 21.77
Culvert, CMP, 8" $ 17.25
Culvert, CMP, 12'' $ 26.45
Culvert, CMP, 15" $ 32.73
Culvert, CMP, 18" $ 37.74
Culvert, CMP, 24" $ 53.33
Culvert, CMP, 30" $ 71.45
Culvert, CMP, 36" $ 112.11
Culvert, CMP, 46" $ 140.83
Culvert, CMP, 60'' $ 235.45
Culvert, CMP, 72" $ 302.58
Page 6 of 9 SUBTOTAL
"KCC 27 A authorizes only one bond reduction.
BasraSPBond
SY
Each
Each
Each
Each
Each
FT
Each
FT
Each
FT
Each
FT
Each
Each
Each
Each
LF
LF
LF
LF
LF
LF
LF
LF
LF
LF
LF
LF
LF
LF
Existing
Rlght-01-way
Quant. I Cost
• ·,
3 3,772.92
3,772.92
Future Public Private
Road Improvements Improvements
& Orainaqe Facllltles
Quant. Cost Quant. I Cost
'' .. •' . ' ",-,; ····:'· ,-·, -..•.. ,_.,1·
Bond Reduction•
Quant.
Complete Cost
. .. · .. ,.
Unit prices updated: 02/12/02
Version: 4/22/02
Report Date: 9/8/2008
"-------"-~------------
..
Site Improvement Bond Quantity Worksheet
DRAINAGE CONTINUED
Unit Price
Culvert, Concrete, 8" $ 21.02
Culvert. Concrete, 1 'l' $ 30.05
Culvert, Concrete, 15" $ 37.34
Culvert, Concrete, 18" $ 44.51
Culvert Concrete, 24" $ 61.07
Culvert. Concrete, 30" $ 104.18
Culver1, Concrete, 36" $ 137.63
Culvert, Concrete 42" $ 158.42
Culvert, Concrete. 48" $ 175.94
Culvert, CPP. 6" $ 10.70
Culvert, CPP, 8" $ 16.10
Culvert, CPP, 12" $ 20.70
Culvert, CPP, 15" $ 23.00
Culvert, CPP, 18" $ 27.60
Culvert, CPP, 24" $ 36.80
Culvert, CPP, 30'" $ 48.30
Culvert, CPP, 36" $ 55.20
Oltchlna $ 8.08
FloW Dlsoersal Trench (1,436 base+I $ 25.99
French Drain (3' depth) $ 22.60
Geotextlle, laid In trench, nnlvnronvfene $ 2.40
Infiltration oond testlno $ 74.75
Mid-tank Access Riser, 48" dla, 6' deep $ 1,605.40
Pond Overflow Srl\tway $ 14.01
Restrlctor/011 Separator 1 Z' $ 1 045.19
Restrlctor/011 Senarator 15" $ 1,095.56
Restrictor/011 Separator 18" $ 1,146.16
Rlprap, placed $ 39.08
Tank End Reducer (36" diameter) $ 1,000.50
Trash Rack, 12" $ 211.97
Trash Rack, 15" $ 237.27
Trash Rack, 15• $ 268.89
Trash Rack, 21" $ 306.84
Page7of9 SUBTOTAL
*KCC 27 A authorizes only one bond reduction.
A~~raSPBond
Existing Future Public Private
Right-of-way Road Improvements Improvements
& Drainage Facilities
Unit Quant. Cost Quant. Cost Quant. Cost
LF
LF 14 420.7
LF
LF
LF
LF
LF
LF
LF
LF
LF
LF 129 2670.3
LF
LF
LF
LF
LF
CY 10 80.8
LF
LF
SY
HR
Each
SY
Each
Each
Each
CY 10 390.8
Each
Each
Each
Each
Each
35626
Bond Reduction*
Quant.
Comolete Cost
Unit prices updated: 02112102
Version: 4/22102
Report Date: 9/8/2008
, . _,
Site Improvement Bond Quantity Worksheet
Unit Price Unll
l'/\10\lr•JG LO r SllHFIIClf•H,
T AC, 7 too course rock & 4" borrow $ 15.84 SY
2" AC, 1.5" lop course & 2.5" base course $ 17.24 SY
4N select borrow $ 4.55 SY
1 .5" too course rock & 2.5" base course $ 11.41 SY
wrmE-IN-ITEMS
Mailboxes $ 800.00 EA.
EA.
LF
EA.
EA.
EA.
LF
SF
LF
LF
SUBTOTAL
SUBTOTAL (SUM ALL PAGES):
30'k CONTINGENCY & MOBILIZATION:
Page 8 of 9
• KCC 27 A authorizes only one bond reduction.
R.!sraSPBond
GRANDTOTAL:
COLUMN:
Existing Future Public Private
Right-of-way Road Improvements Improvements
& Drainaqe Facitltles
Quant. I Price Quant. Cost Quant. Cost
1 800
800.00
30,565.34
9,169.80
39,734.95
B C D
Bond Reduction•
Quant.
Comolete Cost
1,223.24
366.97
1,590.21
E
Unit prices updated: 02/12/02
Version: 4/22/02
Report Date: 9/8/2008
"
. ' . .
Site Improvement Bond Quantity Worksheet
Original bond computations prepared by:
Name: Chau 3 Lot Short Plat Dato: 28-Aug-08
PE Registration Number: 20734 T ol. #: 253-850-0934
Firm Name: Jaeger Engineering
Address: 9419 S. 204 Place, Kent, WA. 98031 Project No: L03S0016
ROAD IMPROVEMENTS & DRAINAGE FACILITIES FINANCIAL GUARANTEE REQUIREMENTS
PERFORMANCE BOND· PUBLIC ROAD & DRAINAGE
AMOUNT BOND· AMOUNT MAINTENANCE/DEFECT BOND·
Stabilization/Erosion Sediment Control (ESC)
Existing Right-of-Way Improvements
Future Public Road Improvements & Drainage Facilities
Private Improvements
Calculated Quantity Completed
Total Right-of Way and/or Site Restoration Bond•1••
{First $7,500 of bond· shall be cash.)
Performance Bond• Amount (A+B+C+D) = TOTAL
Redufed Performance Bond• Total •••
(A)
(B)
(C)
(D)
(A+B)
(T)
$ 1,473.4
$ 39,734.9
$
$ 1,590.2
$ 41,208.4
$ 42,798.6
Minimum bond' amount 1s $1000.
REQUIRED AT RECORDING OR
TEMPORARY OCCUPANCY •••
I I (E) $ J
I
TX 0.30 $ 12,839.6 OR
(T-E) $ 42,798.6
Use larger of Tx30% or (T-E) (B+C) x
Maintenance/Defect Bond• Total 0.25 = $ 9,933.7
NAME OF PERSON PREPARING BOND· REDUCTION:
• NOTE: The word ''bond" as used in this document means any financial guarantee acceptable to King County .
.. NOTE: KCC 27 A authorizes right of way and site restoration bonds to be combined when both are required.
Date:
The restoration requirement shall include the total cost for all TESC as a minimum, not a maximum. In addition, corrective work, both on-and off-site needs to be included.
Quantities shall reflect worse case scenarios not just minimum requirements. For example, if a salmonid stream may be damaged, some estimated costs for restoration
needs to be reflected in this amount. The 30% contingency and mobilization costs are computed in this quantity.
••• NOTE: Per KCC 27A, total bond amounts remaining after reduction shall not be less than 30% of the original amount (T) or as revised by major design changes.
SURETY BONO RIDER NOTE: If a bond rider is used, minimum additional performance bond shall be { $ 1,590.2 j(C+D)-E
REQUIRED BOND· AMOUNTS ARE SUBJECT TO REVIEW AND MODIFICATION BY ODES
Page 9 of9
BasraSPBond
Unit prices updated: 02/12/02
Version: 4/22/02
Report Date: 9/8/2008
·~
Chau Short Plat -Engineering File
·~ f
Status -On Hold ...... Coordination with applicant has not
occurred since November 2008.
Engineering plans need final review.
Tree retention plans must be submitted by applicant for
final review.
ft ·l,
• •
King County
Department of Development
and Environmental Services
900 Oakesdale Avenue Southwest
Renton, WA 98055-1219
. March 12, 2004
Ha Minh Chau
4101 1501h Avenue SE
Bellevue, WA 98006
•
RE: Preliminary Approval for Short Subdivision No.L03S0016
Dear Ms Chau:
The Land Use Services Division (LUSD) has completed review of the short subdivision
application captioned above. The LUSD finds that the proposed short subdivision complies with
the King County Land Segregation Code (Title 19A), Zoning Code (Title 21A), and other
applicable codes as specified in King County Code (KCC) 19A.08.060.
The short subdivision is granted preliminary approval subject to the Conditions of Preliminary
Approval attached hereto and incorporated herein by reference. Any aggrieved party may appeal
this decision by the appeal deadline, which is March 29, 2004. The appeal procedure is enclosed
for your information. The preliminary approval is valid for a period of 60 months from the date of
this letter, unless an appeal is filed. In the event that an appeal is filed, the preliminary approval is
valid for a period of 60 months from the date of the appeal decision.
Enclosed are the following:
• Notice of Decision
• Conditions of Preliminary Approval
• Appeal Procedure
If you have any questions regarding this letter, please contact Fereshteh Dehkordi, Program
Manager, at (206) 296-7173 and Curt Foster, Engineer, at (206) 296-7106.
Curt Foster, P.K, Senior Engineer
Engineering Review Section, LUSD
Enclosures
cc: Jim Jaeger, Jaeger Engineering
Applicant File
Letter.frm/CoverLtr2000.SP.doc 3/9/00
·~ enior Planner
Current Planning Section, LUSD
<® •
King County
Department of Development
and Environmental Services
900 Oakesdale Avenue SW
Renton, WA 98055-1219
File No.
File Name:
Application Date:
Revision Date:
CONDITIONS OF APPROVAL
L03S0016
Chau Short Plat
May 2, 2003
January 30, 2004
•
This short subdivision is granted preliminary approval subject to the following Conditions of
Approval. These conditions are based on a field visit and current information the applicant
has provided about the short subdivision property. Occasionally, in satisfying the Conditions
of Approval, a more definitive land use limitation of the property may be revealed. New
information (such as. final Health approval or sensitive areas review) may require additional
conditions arid may reduce the numqer of lots.
Final approval will be granted after compliance with the Conditions of Approval. Key codes
and guidelines have been noted to provide guidance in preparing the required plans and other
documents. Compliance with some of the following conditions will require that engineering
plans be.prepared by a professional civil engineer licensed in the State of Washington.
1. Title 19A
A. The short subdivision shall comply with all provisions of Title 19A.
B. The final review process must be completed prior to recording of the short
subdivision. The Department of Development and Environmental Services
(DOES) strongly recommends the Final Short Plat be submitted at least one
year prior to the expiration date of the project. The Final Short Plat submittal
package includes:
I. A surveyed map page (four sets) including lot area closure calculations;
2. Final health approval from the King County Health Department ( different
from preliminary health approval);
3. A current short plat certificate and supporting documents (easements, etc.);
4. Payment of the Final Short Plat submittal fee;
5. A copy of this letter (preliminary approval letter).
A licensed land surveyor shall be hired to prepare the final short subdivision
documents. These documents shall comply with all of the following
conditions for final approval:
• •
C. All persons having an ownership interest in the subject property are required to
sign the final short subdivision.
D. If modifications to the approved preliminary site plan (Attachment I) are
. needed to accomplish engineering design or final short plat, then a revised
preliminary site plan shall be submitted to DOES for review and approval.
The revised site plans shall be submitted with the engineering plans or the final
short plat submittal.
2. Surface Water Management (KCC 9)
1998 King County Surface Water Design Manual (SWDM)
A. This short subdivision proposal is subject to Full Drainage Review per section
1.1.2.3. Final short subdivision approval shall require full compliancewith
drainage provisions and storm drainage requirements of this section.
Compliance may result in reducing the number and/or location oflots shown
on the approved preliminary short subdivision. The conditions outlined below
are site-specific drainage conditions:
(1) Core Requirement #1 -Discharge at the Natural Location
(2) Core Requirement #2 -Off-Site Analysis
(3) Core Requirement #3 -Flow Control
(4) Core Requirement #4 -Conveyance System
(5) Core Requirement #5 -Erosion & Sedimentation Control
(6) Core Requirement #6 -Maintenance and Operation
(7) Core Requirement #7 -Financial Guarantees & Liability
(8) Core Requirement #8 -Water Quality
· (S 1) Special Requirement #1 -Other Adopted Requirements
B. A professional civil engineer licensed in the State of Washington shall prepare
a Technical Information Report and/or engineering plans per Chapter 2, of the
1998 King County Surface Water Design Manual.
3. Health (KCC 13)
This project is exempt from further King County Heath Department review.
However, if improvements are required from the Sewer and/or the Water
District, then verification shall be required from said District(s) that the
improvements have been bonded and/or installed, prior to final recording of
the short plat.
• •
4. Road Standards (KCC 14)
1993 King County Road Standards, Ordinance 11187
Final short subdivision approval shall require full compli~nce with the provisions set
forth in the King County Road Standards including engineering. plans for all road
improvements. The engineering plans shall be prepared by a professional civil
engineer licensed in the State of Washington. DDES strongly recommends the
Engineering Plans be submitted at least two years prior to the expiration date of the
project. ·
A. That portion of the North half of SE 172nd Street adjoining the subject property
shall be improved to an urban Sub-access standard per KCRS Section 1.03.
B. That portion of the East half of 1061h Avenue SE adjoining the subject property ·
shall be improved to an urban Sub-access standard per KCRS Section 1.03.
C. Provide 35' paved.radii at the intersection of 1061h Avenue SE and SE 172
Street per KCRS Section 2.10. Dedicate a 25-foot property line radius at the
intersection of I 06'h A venue SE and SE 172nd Street per KCRS Section 2.10.
D. Existing roadside obstacle(s) shall be relocated to provide a minimum
clearance of 10 feet from the edge of the travel lane to the obstacle(s) per
KCRS Section 5.11.
E. Private access to Lots 2 and 3 shall be shown as a joint-use driveway tract per
KCRS Section 3.0 l. The tract shall be an undivided ownership to the lots it
serves, and the lot owners shall be responsible for its maintenance. The tract
shall be 20-feet wide with a 18-foot-wide paved surface. The tract shall be a
minimum of 20 feet in length.
· F. The following notes shall be shown on the final recorded short subdivision:
1) Warning: King County has no responsibility to build, improve,
maintain or otherwise service the private roads contained within or
providing service to the property described in this short subdivision.
2) All private easements and/or tracts to be maintained, repaired, and/or
rebuilt by the owners of the parcels having legal access therefrom and
their heirs, assigns or successors, unless and until such roads are
improved to King County standards and are dedicated and accepted by
King County for maintenance.
G. All utilities within proposed rights-of-way shall be included within a franchise
approved by the King County Council prior to final short subdivision
recording.
• •
H. All restrictions, easements, tracts, and their purpose shall be shown on the final
recorded short subdivision.
5. Building and Construction Standards (Title 16)
Grading. The applicant shall comply with all applicable provisions ofKCC 16.82.
6. Fire Code (KCC 17)
Section 902 of the 1997 Edition of Uniform Fire Code
The applicant shall obtain the approval of the King County Fire Protection Engineer
for the adequacy of the fire hydrant, water main, and fire flow standards ofKCC 17.08
. prior to recoding of the lots.
7. Zoning Code (KCC 21A)
A. Density and Dimensions (KCC 21A.12)
All lots shall meet the density and dimensions requirements of the R-8-SO
zone classification or shall be as shown on the face of the approved prelimi-
nary short subdivision, whichever is larger. Minor revisions to the short
subdivision, which do not result in substantial changes and/cir do not create
additional lots may be approved at the discretion ofLUSD.
B. Street Trees (KCC 21A.16)
Street trees shall be provided along that portion of the right-of-way for
I 061h Avenue Southeast and Southeast 172nd Street abutting the subject
property, pursuant to the provisions of KCC 21A. I 6.050(E) and KCC
21 A.16.190, unless existing trees are shown to be equivalent to the
requirement of Code. See note below. The required street trees shall be
designed as to location and spacing on the final plan submittal. The street trees
must be installed and inspected, or a performance bond posted, prior to
recording of the plat. If a performance bond is posted, the street trees must be
installed and inspected within one year of recording of the plat. At the time of
inspection, if the trees are found to be installed per the approved plan, a
maintenance bond must be submitted, or the performance bond replaced with a
maintenance bond, and held for one year. After one year, the maintenance
bond may be released after ODES has completed a second inspection and
determined that the trees have been kept healthy and thriving.
NOTE:·
I. KCC 21A.16.0SO Landscaping -street frontages. The average
width of perimeter landscaping along street frontages shall be provided as
follows:
• •
For single-family subdivisions:
a, Trees shall be planted at the rate of one tree for every 40 feet of
frontage along a neighborhood collector street or arterial street.
b. The trees shall be:
·I. Located within the street right-of-way if permitted by the
custodial state or local agency;
2. No more than 20 feet from the street right-of-way line when
located within a lot;
3. Maintained by the adjacent landowner unless part of a County
maintenance program; and
4. A species approved by the County if located within the street
right-of-way and compatible with overhead utility lines.
c. The.trees may be spread at irregular interva.ls in order to
accommodate sight distance requirements for driveways and
intersections.
2. KCC 21A.16.190 Financial guarantees. Financial guarantees shall
be.required consistent with the provisions of Title 27 A.
C. Significant Tree Retention-KCC 2 IA.38.230 Which applies to the site, a
detailed tree retention plan shall be submitted with the engineering plans for
the subject plat. The tree retention plan (and engineering plans) shall be
consistent with the requirements of KCC 21 A.38.230, as well as the conceptual
tree retention plan which is part of the hearing record for this project. No
clearing of the subject property is permitted until the final tree retention plan is
approved by LUSD. Flagging and temporary fencing of trees to be retained
shall be provided, consistent with KCC 21A.38.230B4. The placement of
impervious surfaces, fill material, excavation work, or the storage of
construction materials is prohibited within the fenced areas around preserved
trees, except for grading work permitted pursuant to KCC 21 A.38.230B4d(2).
A note shall be placed on the final plat indicating that the trees shown to be
retained on the tree retention plan shall be maintained by the future owners of
the proposed lots, consistent with KCC 21A.38.230B6. (Note that the tree
retention plan shall be included as part of the final engineering plans for the
subject plat.) If there are no significant trees as defined by the Special Overlay
District on the site then. this requirement does not apply.
D. The existing house shall be removed or demolished prior to the final approval
and recording. A demolition permit shall be obtained prior to demolition.
8. Road Mitigation Payment System
• •
The applicant shall comply with Road Mitigation Payment System (MPS), by paying
the required MPS fee as determined by King County Department of Transportation,
plus an administrative fee. The applicant has an option to either:
A. Pay the MPS fee at final short subdivision recording and the MPS
administrative fee at final short subdivision application, or
B. Pay the MPS fee at building permit issuance and the MPS administrative fee at
the time of building permit application.
If option A is chosen, then the following note shall be shown on the final short
plat:
MPS FEE NOTICE:
All fees required by King County code 14.75, Mitigation Payment System
(MPS) have been paid.
If option B is chosen, then the following note shall be shown on the final short
plat:
MPS FEE NOTICE:
This short plat is subject to King County Code No. 14.75, King County Road
Mitigation Payment System (MPS). The MPS fees plus the MPS
administrative fee shall be paid at the time of building permit application at
the rate in effect at that time.
9. State Environmental Policy Act (SEPA)
This short subdivision was exempt from the provision of the State Environmental
Policy Act (SEPA). .
10. Other Considerations
Preliminary approval of this application does not limit the applicant's responsibility to
obtain any required permit or license from the State or other regulatory body. This
may include obtaining a forest practice permit from the Washington State Department
of Natural Resources for tree removal.
I . 1:;: LI~V,=38~.5 t--~--
1
. . 15 ~ <t
~ • 11,k ;';,
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1'11;.LDCATED FH. G'-~3
KING COUNTY ·
LAND USE SERVICES
.,,.,~,., .... , ... _,,.,
-'0 .
12' RCP
INV=386.7 ·
DITCH
--
EDGE OF PAVEMEN1
--
• •
Transmitted to the following Parties of Record for short plat L03S0016:
Cramer Northwest Inc.
945 N. Central Ave., Suite # I 04 Kent, WA 98032
Mr. & Mrs. G.A. Headland
17030 106 1h Ave SE Renton, WA 98055
Jay Newton
17006 1061
h Ave SE Renton, WA 98055
Trishah Bull, Project Manager II, DDES Land Use Services Division
Curt Foster, Sr. Engineer, ODES Land Use Services Division
Mazen Haidar, Engineer, DDES Land Use Services Division
Rich Hudson, Program Manager III, ODES Land Use Services Division
s
•
ATTACHMENT A
RIGHT TO APPEAL
•
This action may be appealed in writing to the King County Hearing Examiner, with a fee
of$250.00 (check payable to King County Office of Finance).
As required by KCC 20.20.090 and 20.24.090, the appeal period shall be fourteen (14)
calendar days and shall commen~e on the third day after the notice of decision is mailed.
Filing an appeal requires actual delivery to the King County Land Use Services Division
· prior to the close of business (4:30 p.m.) on the date due. Prior mailing is not sufficient if
actual receipt by the Division does not occur within the applicable time period. The
Examiner does not have authority to extend the time period unless the Division is not
open on the specified closing date, in which event delivery prior to the close of business·
on the next business day is sufficient to meet the filing requirement.
If a timely Notice of Appeal has been filed, the appellant shall file a statement of appeal
within a 21-day calendar period commencing three days after the notice of decision is
mailed. The statement of appeal shall identify the decision being appealed (including file
number) and the alleged errors in that decision.
The statement of appeal shall state: I) specific reasons why the decision should be
reversed or modified; and 2) the harm suffered or anticipated by the appellant, and the
relief sought. The scope of an appeal shall be based on matters or issues raised in the
statement of appeal. Failure to timely file a notice of appeal, appeal fee, or statement of
appeal deprives the Examiner ofjurisdictiori to consider the appeal.
Appeals must be submitted to the Department of Development and Environmental
Services, addressed as follows:
LAND USE APPEAL
Land Use Services Division
Department of Development and Environmental Services
BlackRiver Corporate Park
900 Oakesdale Avenue Southwest
Renton, WA98055-1219
A request for a pre-hearing conference may be made by any party. For more information
regarding appeal proceedings and pre-hearing conferences, please contact the Office of
the Examiner for a Citizens' Guide to the Examiner hearings and/or read KCC 20.20 and
20.24.
'
ti
KingCounty
Department of Development
And Envlronmarital Services
900 Oaliesdale Avenue SW
Renton, WA 98055-5212
206-296-6600 TIY 206-296-7217
www.metrokc.gov
Engineering Plans Review Comments
Project Type : 3 Lots Short Plat Review Date : 10-02-2008 Reviewer Name : Mazen Haidar, P.E.
Project Name : Chau Short Plat Review No.: 2 na Email : mazen.haidarca>metrokc.gov
Project Number : L03S0016 Phone: (206) 296 -7133
Activity Number : L07SR022 Fax: (206) 206 -6613
Sub Back. Reference Item Review Comments Consultant Response Check
Item
Sheat-1 1 Please provide the United States Postal Services
(USPS) approval stamp and signature for mailboxes
location.
Sheat-2 1 Please revise the proposed dispersal trenches location
to maintain 25' of vegetated flow path between trench
location and orooertv lines.
General 1 Please provide 5 copies of separate significant trees
plan with standard details and notes for County review
2 Please be informed that constructability review is
pending for the subject project and full compliance with
the review comments and conditions (if any) is
necessarv for the enaineerina review aonroval.
3 Please be informed that significant trees plan review will
be needed for the subject project-and full compliance
with the review comments and conditions (if any) is
necessarv for the enaineerina review annroval.
4 Please submit three sets of revised plans for further
review by the County
Sheet 1 of 1
.. :.,
ti
King County
Department of Development
And Environmental Services
900 Oakesdale Avenue SW
Renton, WA 98055-5212
206-296-6600 TTY 206-296-7217
www.metrokc.gov
Engineering Plans Review Comments
Project Type : 3 Lots Short Plat Review Date : 10-01-2007 Reviewer Name : Mazen Haidar, p.E::. .
Project Name : Chau Short Plat· Review No.: 1•' Email: mazen.haidar@metrokc.gov
Project Number : L03S0016 Phone: (206) 296 -7133
Activity Number : L07SR022 ·· Fax: (206) 206 -6613 .. '
Sub Back Reference Item Review Comments Consultant Response Check Item
Sheet-1 1 Please show the United States Postal Services (USPS)
approval stamp and signature for mailboxes location and
show box standard detail oer the 1993 KCRS
Sheet-2 1 Please show property lines stations in profiles
2 Show standard detail for thicken-edge
3 Indicate name of party responsible for relocating
existing power poles and reference 93 KCRS for
relocation of poles.
4 Please extend urban frontage improvements along the
entire southern property line
Sheet-3 1 Please replace ADA ramps details with those referenced
in red on plans.
TIR 1 Please check impervious areas calculations for the
developed conditions, the calculations shown more than
10,000 square-feet of new impervious surfaces will be
created which makes the subject short plat is subject to
Larqe Site Drainaqe Manual
Sheet 1 of 2
I
__ ,
•
~
King County
Department of Development
And Environmental Services
900 Oakesdale Avenue SW
Renton, WA 98055-5212
206-296-6600 TIY 206-296-7217
www.nietrokc.gov
Sub
Reference Item
Item
2
3
4
.
General 1
2
3
4
Back Review Comments Consultant Response Check
Please note the use of perforated stub-outs alone is not
an acceptable BMP, per the 1998 King County Surface
Water Design Manual (KSWDM) the plans shall show an
acceptable BMP's such as dispersal or infiltration
trenches.
Please make sure the plans show proposed BM P's with
standard details as needed.
Please include bond quantities calculations in Tl R
Please provide a separate TESC plans with standard
notes and details
Please provide significant trees plans for review and
approval by the County
Show standard detail for street trees.
Please add the following note on plans:
Per KCRS Section 4.01F, a 1 inch full width
overlay shall be required. Appropriate repairs to
the existing subgrade, base material, surfacing
and pre-level may be required prior to placing
the overlay. The overlay may be waived only
upon written request and after an evaluation of
pavement conditions and/or channelization
requirements has been completed and approved
by the County Road Engineer or Development
Engineer.
Sheet 2 of 2
'
ti
King County
Departme·nt of Development
And Environmental Services
900 Oakesdale Avenue SW
Renton, WA 98055-5212
206-296-6600 TIY 206-296-7217
www.metrokc.gov
Engineering Plans Review Comments
ProjectType: 3 Lots Short Plat Review Date : 10-01-2007 Reviewer Name : Mazen Haidar, P_,E. . • •
Project Name : Chau Short Plat · Review No.: 1st Email: mazen.haidar@metrokc.gov
Project Number : L03S0016 Phone: (206) 296 -7133
Activity Number : L07SR022 . Fax: (206) 206 -6613 .
Sub · Back Reference Item Review Comments Consultant Response Check Item
Sheet-1 1 Please show the United States Postal Services (USPS)
approval stamp and signature for mailboxes location and
show box standard detail oer the 1993 KCRS
Sheet-2 1 Please show property lines stations in profiles
2 Show standard detail for thicken-edge
3 Indicate name of party responsible for relocating
existing power poles and reference 93 KCRS for
relocation of poles.
4 Please extend urban frontage improvements along the
entire southern property line
Sheet-3 1 Please replace ADA ramps details with those referenced
in red on plans.
TIR 1 Please check impervious areas calculations for the
developed conditions, the calculations shown more than
10,000 square-feet of new impervious surfaces will be
created which makes the subject short plat is subject to
Larae Site Drainaae Manual
Sheet 1 of 2
tQ
King County
Department of Development
And Environmental Services
900 Oakesdale Avenue SW
Renton, WA 98055-5212
206-296~600 TTY 206-296-7217
www.metrokc.gov
Sub
Reference Item
Item
2
3
4
General 1
2
3
4
Back Review Comments Consultant Response Check
-•-,-
Please note the use of perforated stub-outs alone is not
an acceptable BMP, per the 1998 King County Surface
Water Design Manual (KSWDM) the plans shall show an
acceptable BMP's such as dispersal or infiltration
trenches.
Please make sure the plans show proposed BM P's with
standard details as needed.
Please include bond quantities calculations in TIR
Please provide a separate TESC plans with standard
notes and details
Please provide significant trees plans for review and
approval by the County
Show standard detail for street trees.
Please add the following note on plans:
Per KCRS Section 4.01F, a 1 inch full width
overlay shall be required. Appropriate repairs to
the existing subgrade, base material, surfacing
and pre-level may be required prior to placing
the overlay. The overlay may be waived only
upon written request and after an evaluation of
pavement conditions and/or channelization
requirements has been completed and approved
by the County Road Engineer or Development
Enaineer.
Sheet 2 of 2
'
~
ti
King County
· Department of Development
And Environmental Services
900 Oakesdale Avenue SW
Renton, WA 98055-5212
206-296-6600 TTY 206-296-7217
www.metrokc.gov .
Engineering Plans Review Comments
· Project Type : 3 lots Short Plat Review Date : 10-01-2007 Reviewer Nanle: Mazen Haidar, P,E.
ProjectName: Chau ShortPlat · Review No.: 1Sl Email: mazen.haidar@metrokc,gov
Prc:>ject Number : L0.3S0016 Phone: (206) 296 -7133 . -.
Activity Number: L07SR022 . Fax: (206) 206 -6613 ·-•.. -. . ..
Sub Back Reference Item Review Comments Consultant Response Check Item
.
Sheet-1 1 Please show the United States Postal Services (USPS)
approval stamp and signature for mailboxes location and
show box standard detail per the 1993 KCRS
Sheet-2 1 Please show property lines stations in profiles
.
2 Show standard detail for thicken-edge
3 Indicate name of party responsible for relocating
existing power poles and reference 93 KCRS for
relocation of ooles.
4 Please extend urban frontage improvements along the
entire southern property line
Sheet -3 1 Please replace ADA ramps details with those referenced
in red on plans.
TIR 1 Please check impervious areas calculations for the
.developed conditions, the calculations shown more than
10,000 square-feet of new impervious surfaces will be_
created which makes the subject short plat is subject to
Larqe Site Drainaqe Manual
Sheet 1 of 2
-·
~
KingCounty
Department of Development
And Environmental Services
900 Oakesdale Avenue SW
Renton, WA 98055-5212
206-296-6600 TIY 206-296-7217
www.metrokc.gov
Sub
Reference Item
Item
..
2
3
4
General 1.
2
3
4
.
Back Review Comments Consultant Response Check
Please note the use of perforated stub-outs alone is not
an acceptable BMP, per the 1998 King County Surface
Water Design Manual (KSWDM) the plans shall show an
acceptable BM P's such as dispersal or infiltration
trenches.
Please make sure the plans show proposed BM P's with
standard details as needed.
Please include bond quantities calculations in TIR
Please provide a separate TESC plans with standard
notes and details
Please provide significant trees plans for review and
approval by the County
Show standard detail for street trees.
Please add the following note on plans:
Per KCRS Section 4.01F, a 1 inch full width
overlay shall be required. Appropriate repairs to
the existing subgrade, base material, surfacing
and pre-level may be required prior to placing
the overlay. The overlay may be waived only
upon written request and after an evaluation of
pavement conditions and/or channelization
requirements has been completed and approved
by the County Road Engineer or Development
Engineer.
Sheet 2 of 2
r • •
® Web date· 10/10/2005
King County
Department of Development and Environmental Services
Land Use Services Division
ENGINEERING REVIEW
CHECKLIST
1998 Surface Water Design Manual
1993 King County Road Standards
900 Oakesdale Avenue Southwest
Renton, WA 98055-1219
206-296-6600 TTY 206-296-7217 For alternate formats, call 206-296-6600.
PROJECT INFORMATION
Project Name C~r-\
Activity Number ::5RTm
ProJect Number -=-=-""-,.._.,,_~"'-"'~""'"-)\1«-_-'-~-"~°F-----------------------
Development Number
DOES Review Engineer
Notes
OK
Date
D Hearing Examiner's Report ........ Date Revised Report ...... Date -------
0 Plat Ordinance Number Date
D Preliminary Plat Map .......... Date Approved by Hearing Examiner
D Revised Preliminary Plat Map ....... Date Approved by ODES -----------------
D 5-year Expiration ...... Date __________ (Show on engineering cover sheet)
ROUTING TO OTHER KING COUNTY SECTIONS
OK
D Wetland Report / Plans
Route Date ___________ _ Response Date ___________ _
D Geotechnical Report/ Plans
Route Date ___________ _ Response Date ___________ _ -~
D Grading Report / Plans
Route Date ___________ _ Response Date ___________ _
D Structural Designs / Calculations / Civil Plans / Soils Report (Vaults, Retaining Walls, Bridges)
Route Date Response Date ___________ _
D Landscape / Recreation I Street Tree I Plan
Route Date ------------Response Date ------------
EngineeringReviewChecklistFORM.doc le-ckl-ercheck.pdf 10/10/2005 1 of 16
• •
Activity Number: -------------
(Continued)
D Traffic Improvement Plan/ Report
Route Date ___________ _ Response Date ____________ _
D Tree Retention/ Forestry/ Plan
Route Date ___________ _ Response Date ____________ _
D Other Report / Plan
Route Date ___________ _ Response date -------------
D All required routing stations shown and updated on PRMS
Notes
GENERAL SUBDIVISION REQUIREMENTS
D Site plan layout matches preliminary plat approved by Hearing Examiner
(Check for same lot count, tract configuration, road alignments, etc.)
D Compliance with conditions of preliminary approval
D Compliance with Mitigated Determination of Non-Significance
D Tract Table if three or more tracts. Identify name, size and purpose.
D Show and label all SAO tracts, buffers, and 15' BSBL.
D Review maximum height of 6-feet for rockeries and retaining walls per KCC 21A.12.030, 110-170, 220) Also show
standard note per policy on Web site.
D
D
D
Use updated cover sheet showing designation for highly critical sites per Appendix, D44.
Determine if HPA fisheries permit required -contact CAO staff.
Tree Retention Plans -Show standard plan note (see section policies).
SURFACE WATER DESIGN MANUAL (1998)
CORE AND SPECIAL REQUIREMENTS
OK SWDM
D 1.2.1
D 1.2.2
D 1.2.3
D 1.2.6
D 1.2.8
D 1.3.1
D 1.3.2
Core #1 -Evaluate diversion of drainage within subbasins and/or tightline requirements for landslide
hazard drainage areas.
Core #2 -Off-site analysis. Evaluate adequacy and conclusions.
Core #3 -Flow control. Determine design standard based upon mapping and/or off-site analysis.
Evaluate exemptions from flow control if applicable.
Core #6 -All drainage facilities and road access shall be located in public tracts, right-of-way and/or
drainage easements dedicated to King County. For private facilities, specify the required Declaration
of Covenant and drainage easements for final recording.
Core #8 -Water Quality. Determine design standard based upon mapping and/or off-site analysis.
Evaluate exemptions if applicable and untreated areas per page 1-57.
Special #1 -Area specific requirements. Perform P-suffix search on computer, evaluate grading code
restrictions, and review for shared facility drainage plan.
Special #2 -Floodplain boundaries shown on plans.
EngineeringReviewChecklistFORM.doc le·ckl-ercheck.pdf 10/10/2005 2 of 16
• •
Activity Number: -------------
DRAINAGE VARIANCES
OK SWDM
D 1.4 Activity No. _________ Approval Date ______________ _
Design lssue.,=s-----------------------------~
TECHNICAL INFORMATION REPORT
OK SWDM
D 2.3.1.1
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
Section 1 -Project Overview
Figure 1: TIR Worksheet
Figure 2: Site Location
Figure 3: Drainage Basins
a. Acreage of subbasins
b. Identify all site characteristics
c. Show existing discharge points to and from the site
d. Show routes of existing, construction, and future flows at all discharge points and
downstream hydraulic structures.
e. Use a minimum USGS 1 :2400 topographic map as a base
f. Show and cite the length of travel from the farthest upstream end of a proposed storm
system in the development to any proposed flow control facility.
Figure 4: Soils
a. Show the project site
b. The area draining to the site
c. The drainage system downstream for the distance of the downstream analysis
Section 2 -Preliminary Conditions Summary with responses
Section 3 -Off-Site Analysis
Section 4 -Flow Control and Water Quality Facility Analysis and Design
Existing Site Hydrology (Part A)
Developed Site Hydrology (Part B)
Performance Standards (Part C)
Flow Control System (Part D)
Water Quality System (Part E)
Section 5 -Conveyance System Design and Analysis
Section 6 -Special Reports and Studies -Geo, Wetlands, Floodplain analysis (4.4.2)
Section 7 -Other Permits (HPA, Special Use, WSDOT, etc.)
Section B -Erosion / Sedimentation Control Design
Section 9 -Bond Quantities Worksheet and RID Facility Summary
Section 10 -Maintenance and Operations Manual (Section 10 for privately maintained or special
non-standard features
EngineeringReviewChecklistFORM.doc le-ck.1-ercheck.pdf 10/10/2005 3 of 16
'
• •
Activity Number: -------------
SITE IMPROVEMENT PLANS
OK SWDM
D 2.3.1.2
D Vertical Datum NAVO 1988 -show benchmark
D Horizontal Control NAO 1983/91
D 2.3.1.2 General Plan Format
D (1) Sheet size 24" x 36"; quality reproducibles
D (2) King Co. Standard Map Symbols; existing / proposed (Reference 7 A)
D (3) Project Information/ Cover Sheet
D a. Title: Project name and ODES file number
D b. Table of Contents if more than 3 plan sheets
D c. Vicinity Map
D d. Name & Phone of Utility field contacts and One Call Number: 1-800-424-5555 (water, sewer,
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
gas, power)
e. Preconstruction / Inspection notification requirements
f. Name & Phone of erosion control supervisor
g. Name & Phone of Surveyor
h. Name & Phone of Owner I Agent
i. Name & Phone of Applicant
j. Legal description
k. Plan approval block for DOES
I. Name & Phone of engineering firm preparing plans
m. Fire Marshal's approval stamp (if required)
n. Mailbox location approval by U.S. Postal Service
o. List of conditions of preliminary approval on all site improvements
(4) An overall site plan if more than three plan sheets are used
a. The complete property area development
b. Right-of-way information
c. Street names and road classification
d. All project phasing and proposed division boundaries
e. All natural and proposed drainage collection and conveyance systems with catch basin
numbers shown
(5) Each sheet and TIR is stamped, signed, and dated by a Professional Engineer licensed in
Washington State
(6) Detail Sheets Provided
(7) Title block on each sheet
a. Development title
b. Name, address and phone number of engineering firm
c. Revision block
d. Page numbering
e. Sheet title (e.g., road and drainage, grading, etc.)
(8) King County approval block on each plan sheet
(9) The location and label for each section or other detail shall be provided
(10) Critical Area Setbacks per K.C.C. 21A.24
(11) All match lines correspond to the sheet reference
(12) Division phase lines with limits of construction
(13) Standard Plan Notes -General, Drainage & Structural notes (Reference 78)
(14) Survey control plan sheet stamped by licensed PLS in Washington State
EngineeringReviewChecklistFORM.doc Je-ckl-ercheck.pdf 10/10/2005 4 of 16
• •
Activity Number: -------------
SITE IMPROVEMENT PLANS lcontinuodl
OK SWDM
0 2.3.1.2 Plan View: Site Plan and Roadway Elements
(1) Property Lines, R/W lines, roadway widths shown D
D (2) Existing / Proposed road features; CL, edge pavement, edge shoulder, ditches, curb, sidewalk &
D
D
D
D
D
D
access pts
(3) Existing/ Proposed topographic contours@2', 5'>15% slope, 10-'>40% slope
(4) All affected utilities are shown; utility poles marked
(5) All roads and adjoining subdivisions identified
(6) Existing / Proposed R/W dimensioned and shown
(7) Existing / Proposed surfacing shown
(8) Scale generally 1"=50' (1"=100' for lots >1 Acre)
0 2.3.1.2 Plan View: Drainage Conveyance
0 Sequentially number all catch basins and curb inlets
0 Show length, diameter, and material for all pipes, culverts, and stubouts
0 Label catch basin size and type
0 Show stubout locations for roof drains
0 Label all drainage easements, access easements, tracts, and building setbacks
0 Provide flow arrows for drainage direction
0 2.3.1.2 Plan View: Other
0 Show all buildings, property lines, streets, alleys, and easements
0 Verify condition of public right-of-way
0 Show structures on abutting properties within 50 feet
0 Identify fencing for drainage facilities
0 Provide section details of all retaining walls and rockeries
O Show all wells on-site and within 100-feet of site. For well abandonment, include notes referencing
DOE procedures.
0 2.3.1.2 Profiles: Roadway and Drainage
D
D
D
D
D
D
D
D
D
D
D
Existing / proposed roadway centerline (CL) at 50' stations increasing, reading from left to right.
Show stationing of points of smooth vertical curve, with elevations
Show vertical curve data including stopping sight distance
Show all pipes and detention tanks with slope, length, size and type
Show all pipe inverts and elevations of catch basins or lids
Minimum cover dimensions if less than 2.0'
Indicate roadway stationing and offset for all catchbasins
Show vertical and horizontal scales (vertical 1 "=5')
Label all profiles with street names and reference numbers to plan sheet
Show all property boundaries and match line locations
Provide profiles for conveyance systems of 12" and larger pipes or channels other than roadway
ditches
Catch basin lids are flush with ground line
EngineeringReviewChecklistFORM.doc le·ckl·ercheck.pdf 10/10/2005 5 of 16
• •
Activity Number: -------------
SITE IMPROVEMENT PLANS fconunued)
OK SWDM
D 2.3.1.2 Plan Details
D Provide scale drawing of each pond. vault, or water quality facility. Include all pipe details for size,
type, slope, length, etc.
D
D
Show existing and final grade contours at 2-foot intervals. Show maximum design water elevation.
Dimension all berm widths
D
D
D
D
D
D
D
D
D
D 2.3.1.2
D
Notes:
Provide two cross sections through pond, including one section through restrictor
Specify soils and compaction requirements
Show location and detail of emergency overflows, spillways, and bypasses
Specify rock protection I energy dissipation details
Provide inverts for all pipes, grates, etc., and spot elevations on pond bottom
Show location of access roads to control manholes and pond / forebay bottoms
Provide plan an·d section views of all energy dissipaters. Specify size and thickness of rock.
Show bollard locations (Typically at entrance to drainage facility and walking trails)
Restrictor and control structures must have section and plan view drawn to scale
Structural Plan Details
Verify that designer is a licensed structural P.E. for vaults or bridges
EROSION AND SEDIMENT CONTROL (SWDM Appendix D)
OK
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
SWDM
2.3.1.3
D.4.1
General Specifications
Separate plan sheet showing entire site w/features
Show critical areas and buffers in separate tracts
Show existing contours and final grades if scope or work includes grading
Pertinent information from soils report is added to plans
Drainage features identified (streams, wetlands, bogs, springs, seeps, swales, ditches, pipes &
depressions)
Utility corridors other than roads shown
Show drainage divides and flow directions
Specify best management practices
Show cut and fill slopes with catch lines indicated
Sufficient conceptual details to convey design intent
Standard ESC plan notes shown on plans (Page D-69)
For grading and structural fill within lot areas -show standard notes for geo hazards (see section
policies for geo notes)
Clearing Limits
(1) Delineate clearing limits -colored survey tape may be used. Critical areas require plastic/
metal safety fence or stake and wire fences.
(2) Provide detail of fencing
EngineeringReviewChecklistFORM.doc le-ckl-ercheck.pdf 1011012005 6 of 16
• •
Activity Number: -------------
2.3.1.3 EROSION AND SEDIMENT CONTROL ISWDM Appendix D) lconllnuedl
OK SWDM
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D.4.2
D.4.3
D.4.4
D.4.5
D.4.6
Cover Measures
(1) Specify the type and location of temporary and permanent cover measures. (Mulch, erosion
control nets, blankets, plastic, seeding and sodding)
(2) Specify the seed mixes, fertilizers and soil amendments to be used and application rates
(3) Areas receiving special treatment are specified (jute netting, rock lining or sod)
(4) Soil cover practices and locations of disturbed areas
Perimeter Protection
(1) Specify the location and type of perimeter protection to be used -silt fence, brush barriers,
and/or vegetated strips
(2) Provide details and specify type of fabric for silt fence
Traffic Area Stabilization
(1) Show construction entrance with detail (Figure D.4.G)
(2) Show proposed construction roads and parking areas. Specify details for stabilization.
Sediment Retention
(1) Show location of sediment pond or sediment trap. Very small areas can be treated with only
perimeter protection (see D.4.3). ·
(2) Sediment Trap -Can be used for drainage areas of 3 acres or less. Calculate surface area
using 2-year design storm. Show detail per Figure D.4.H.
(3) Sediment Pond -Determine pond geometry and show details on plan for required storage,
depth, length and width
(4) Show sediment pond cross section and detail (Figures 0.4.J and K)
(5) Provide details of cell dividers and stabilization techniques for inlet I outlet
(6) Specify mulch or recommended cover of berms & slopes
(7) Specify the 1-foot marker for sediment.removal
(8) Indicate catch basins for protection and show design details (Figures 0.4.L and M)
Surface Water Control
(1) Show conveyance of all surface water to a sediment pond or trap
(2) Discharge location shall be downslope from disturbed areas
(3) Show details for conveyance with interceptor dike, swales (Figures 0.4.0, P).
(4) For ditches, determine capacity for 10-year storm with 0.5 feet freeboard. Show details for
check dams (Figure 0.4.R). Determine check dam spacing and as needed, show inverts and
minimum slopes of open channels. Also show direction of open channel ftow.
(5) For pipe slope drains, determine capacity for 10-year storm. Show details per Figure 0.4.Q.
(6) Determine level of protection for outlet (rock pad, outfall design, or level spreader). See
requirements in D-38 through D-40.
(7) Evaluate off-site flows entering the site and assure bypass of disturbed areas
EngineeringReviewChecklistFORM.doc le-ckl-ercheck.pdf 1011012005 7 of 16
• •
Activity Number: -------------2. 3. 1. 3 EROSION AND SEDIMENT CONTROL (SWDM Appendix DI (contlnuodl
OK SWDM
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D.5.1
D.5.2
D.5.3
D.5.4
D.5.7
D.5.8
ESC Report
(1) Show detailed construction sequence (page D-70)
(2) All required calculations and soils reports contained in TIR
Wet Season Requirements
(1) Provide a list of all applicable wet season requirements (details on page D-42)
Critical Area Restrictions
(1) Consider phased construction during the dry season. See special recommendations on page D-
43.
Maintenance
(1) Plans shall list the name, address and phone number of the ESC Supervisor. A sign shall also
be posted on the construction site with information for contacting the ESC supervisor.
(2) Determine if site is Highly Critical (Soil Types C or D, 5 acres of disturbance, large areas with
slopes >10%, proximity to streams, wetlands, or lakes)
(3) On cover sheet of engineering plans, designate if highly critical site
NPDES Requirements
(1) Determine if project will disturb more than 5 acres
(2) If disturbed area is greater the 5 acres, show the following note on the plans:
"No construction or site disturbance for this project may begin before the applicant first obtains a
General Permit to Discharge Stormwater Associated with Construction Activity permit from the
Washington State Department of Ecology (DOE). For more information or application form,
please visit DOE's website at http://www.ecy.wa.gov/biblio/ecy02085.html"
Forest Practices Permit
(1) Determine if project needs FPA permit. Contact DOES grading section.
(2) Provide a reference note on the cover sheet indicating whether or not an FPA permit has been
obtained.
· Early Start Plan Review
(1) Standard cover sheet included with Title for Phased Early Start
(2) List the scope of work for early start (scope of work will vary for each project -evaluate clearing,
grading for roads, lot grading, utility installation, vault construction, off-site work)
(3) Update the sheet index to identify all plans with updated page numbers
(4) Include standard ESC plan prepared in accordance with all requirements listed above for
erosion and sediment control
(5) Include detailed construction sequence and identify ESC supervisor
(6) Show standard erosion control notes
(7) Show early start activity number on all plain sheets
EngineeringReviewChecklistFORM.doc le-ckl-ercheck.pdf 10/10/2005 8 of 16
• •
Activity Number: -------------
DESIGN REQUIREMENTS
OK SWDM
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
3.2
3.27
3.3.6
3.3.7
4.0
4.5
4.7
4.9
4.9
4.10
4.27
4.35
4.51
4.69
4.53
5.0
5.3
5.9
5.11
Runoff Computation
Rational Method required for on-site conveyance (See Table 3.2)
KCRTS used for flow control design
Evaluate correct data: Rainfall region, scale factor, time step, record type, acreages, soil cover
groups, and percent impervious
For urban areas, unprotected forest modeled as pasture or grass
For rural areas, unprotected forest assumes 50% grass, 50% pasture
All pre-developed grassland modeled as pasture
All post developed grassland modeled as grass
Impervious coverage calculated based upon specific project -clearly summarize types and amounts
of impervious
For urban development, impervious for each lot, >= 4,000 sq ft or maximum allowed in zoning code
For rural development, impervious for each lot, >= 8,000 sq ft or maximum allowed in zoning code
Evaluate requirements for modeling with effective impervious area
Point of compliance -evaluate for on-site bypass and off-site closed depression
On-site closed depressions and ponding areas
Conveyance System Analysis and Design
Conveyance systems are in easements with BSBLs
Off-site easements must be recorded using standard forms (Reference 8H)
Determine which easements are public and private, label and dimension
Pipes are parallel to and alongside property lines
Minimum pipe size 12-inch, for private systems may allow 8 inch
Easements for pipes outside of right of way
For connecting pipes at structures, match crowns, 80% diameter, or inverts
Minimum velocity at full flow 3.0 feet per second
Minimum cover for pipes 2 feet
Debris barrier for pipes 18-36 inch
Outfall design criteria
Surcharges (backwater analysis may be required)
Maximum headwater allowed for culverts
Bridge design
Floodplain analysis
Open channels
Flow Control Design
Mandatory requirements for roof downspouts in order of preference. Must evaluate feasibility of
each.
• Infiltration • Dispersion • Perforated stubouts
Dispersion system criteria including vegetated flow path
Perforated stub out, if used show detail per Fig. 5.1.3.A
EngineeringReviewChecklistFORM.doc le-ckl-ercheck.pdf 10/10/2005 9 of 16
• •
Activity Number: -------------
DESIGN REQUIREMENTS tcontlnuodl
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
5.14
5. 15
5.17
5.3
5.3.1
5.3.2
Forested open space flow control BMPs
• Show tracts or easements for FOS
• Show required notes on plan for plat recording
Roadway dispersion BMPs, check design criteria
BMPs for reducing facility size. Note: Facility sizing credit allowed for dispersion only if flowpath from
roofs ultimately drain to RID facility.
Detention Facilities
Emergency overflow -Evaluate flow path for safe and adequate conveyance
Setbacks
Flow-through system
Detention Ponds
Dam Safety Compliance
Two cross-sections through pond (one x-section to include control structure}
Review pond details in Figures 5.3. 1.A and B
Designed as flow-through system
Side slopes interior 3H:1V or fenced
Vertical interior retaining walls Stamped by licensed structural civil engineer
For pond walls, min. 25% of perimeter vegetated and no steeper than 3:1
Berms greater than 4 feet require key excavation
Minimum berm width of 6 feet
Primary overflow (control structure with riser}.
Secondary Inlet to the control structure
Emergency Overflow Spillway, 100 year developed peak flow
Soil and compaction requirements described (95% modified proctor}
Access road min. turning radius, maximum grade, min. width, fences or gates
Pond sign (Figure 5.3. 1.D}
Fencing and planting requirements
Setbacks -5 feet from tow of exterior slope or 5 feet from water surface for cut slope
Detention Tanks
Flow-through system required
6" of dead storage in tank bottom
Minimum pipe diameter of 36"
Materials and structural stability
Control structure per Section 5.3.4
Buoyancy
Access risers and CBs are spaced properly with max. depth from finished grade to tank invert shall
be 20 feet and accessible by maintenance vehicles
EngineeringReviewChecklistFORM.doc le-ckl-ercheck.pdf 10/10/2005 10of16
• •
Activity Number: -------------
DESIGN REQUIREMENTS rcontlnuedl
OK SWDM
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
5.3.3
5.3.4
5.4
6.0
6.1
6.2
6.2.2A
6.2.3
6.2.4
6.2.5
6.3
6.3.1
6.3.1.1
6.3.1
6.3.4
Detention Vaults
Structural package submitted for approval
Flow-through system required
Review design details per Fig. 5.3.3.A. Note: Grate over sump with 2' x 2' hinged access door
Access positioned a maximum of 50 feet from any location. (if over 3 foot cover use cone riser)
Access required to inlet pipe and outlet
Removable 5x1 O panel if vault greater than 1250 sq. ft. floor area
Maximum depth from finished grade to vault invert to be 20 feet
Minimum internal height shall be 7 feet, min. width shall be 4 feet min
Ventilation pipes provided in all four corners
Control Structures
Section and plan view shown to scale
Orifice size and elevation on plans match calculations. Minimum orifice 0.5".
(Note: Information Plate details are no longer required -see policy on Web site.)
Infiltration Facilities
Appropriate soils logs and testing procedures in TIR
Pond bottom at least 3 feet above seasonal high water
Permeable soil extends minimum 3 feet below bottom of pond
Geotechnical report states suitability and determines design infiltration rate
Overflow route identified with 100-yr overflow conveyance
Spill Control device upstream of facility
Presettling
Review setback requirements, page 5-60. Design water surface setback of 20 feet from external
tract, easement or property lines
Show the standard note regarding public rule for in operation facility (see section policies)
Water Quality Design
Water Quality Menus
Water Quality facilities
Water Quality Sequencing
Setbacks, slopes and embankments
Facility Liners
Flow Splitter Designs
Biofiltration Facility
Biofiltration swales and soil amendments
Methods of Analysis
Swale geometry, plantings, flow conveyance, high flows, velocity
Road access requirements, page 6-43
Filter strip geometry (slopes)
EngineeringReviewChecklistFORM.doc 1011012005 11of16
• •
Activity Number: -------------
DESIGN REQUIREMENTS fcontlnuodl
OK SWDM
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
Notes:
6.4.
6.4.1.2
6.4.1.1
6.4.2
6.4.1.1
6.4.1.1
6.4.2.2
6.4.3
6.4.3.1
6.4.3.2
6.4.4
6.4.4.1
6.4.4.2
6.4.4.2
6.5
6.5.1
6.5.2
6.5.2.1
6.5.2.2
6.5.3
6.5.3.2
6.5.3.2
Wetpool Facility Designs
Wetpool geometry, 2 cells, minimum depth of first cell 4 feet
Flowpath length to width ratio 3: 1. Note: If flow path achieved with berms or walls, top of berm must
be at 2-year water surface elevation.
Berms, Baffles, Slopes
lnleUOutlet Design
Access, setbacks, and plantings
Wetvaults
Sizing basic or large
Berms, Baffles, Slopes
Two cells separated by wall or removable baffle
Vault bottom forms a broad "V" with 5% sideslopes
Inlet is submerged and outlet pipe designed for 100-year overflow
Gravity drain provided if grade allows
Minimum 50 square feet of grate over second cell
Stormwater Wetlands
Methods of Analysis
Design Criteria -Wetland geometry, liners, access, plantings
Combination Detention and Wetpool facilities
Methods of Analysis
Design Criteria -Detention and wetpool geometry, berms, baffles, slopes
Access and plantings
Media Filtration Facility Designs
Presettling/pretreatment
Sandfilters -Basic and Large
Methods of analysis
Design Criteria -Geometry, overflow/bypass, underdrain, and access
Sandfilter Vaults
Design Criteria -geometry, pretreatment, flow-spreading, energy dissipation
Overflow/bypass, underdrain and access
EngineeringReviewChecklistFORM.doc le-ckl-ercheck.pdf 10/10/2005 12of16
• •
Activity Number: -------------
KING COUNTY ROAD STANDARDS (1993)
GENERAL REQUIREMENTS
1.03A, B
1.03 D
Off-site and frontage improvements determined by reviewing agency
Note: For grading permits, the required extent of road improvements must be determined during
engineering review. For subdivisions, the requirements are determined during preliminary
review.
Subdivisions must have recorded public access except for private roads
DESIGN REQUIREMENTS
1.08 Road Variances
Activity No. Approval Date ----------
Design Issues
ROAD CLASSIFICATION TABLE
Name of Roadwav KCRS Classification
OK KCRS
D 2.03C Maximum Superelevation (2.05)
D 2.030 Horizontal curvature (2.05)
D 2.03E Maximum grade (2.11)
D 2.03F Stopping Sight Distance (2.05, 2.12)
D 2.03G Entering Sight Distance (2.05, 2.13)
EngineeringReviewChecklistFORM.doc le-ckl-ercheck.pdf 1011012005 13 of 16
• •
Activity Number: -------------
KING COUNTY ROAD STANDARDS (1993)
DESIGN REQUIREMENTS (conllnuedl
OK KCRS
D 2.03H
D 2.031
D 2.03J
D 2.03J
D 2.03K
D 2.03L
D 2.06
D 2.0667
D 2.07
D 2.08A
D 2.08B
D 2.08E
D 2.08F
D 2.09
D 2.098
D 2.10A
D 2.10A
D 2.10A
D 2.10B
D 2.10C
D 2.10E
D 2.11A
D 2.118
D 2.120
D 2.16
D 2.18
D 2.20
D 3.01
D 3.01
D 3.02A
D 3.02B
D 3.05
Minimum pavement width (Note: Footnote 9 -Neighborhood collectors require 36-feet at approach to
intersections with arterials)
Minimum roadway width
Minimum R/Wwidth
Min. R/W width (Footnote 12 and 2.198 -include 1 foot extra ROW behind curb or sidewalk)
Curb or shoulder type road (2.01)
Minimum Half-Street width
Private Street Design Standards
Verify maximum potential of 16 lots
Half Streets
Minimum Cul-de-Sac diameters
Maximum Cul-de-Sac length
Maximum Cross Slope 6%
Bulb island shall be offset 2-feet
Alleys
Private Access Tracts (Note: Must meet all standards for minor access street, except curb cut
driveway design is allowed with property line radii dedication)
Angle of intersection between 85 and 95 degrees
Intersection curb radius
Intersection right-of-way radius
Intersection spacing
Intersection landing
Lo~ Speed Curves
Maximum Grade -Use AC for grades >12%, Use PCC for grades >20%
Grade Brakes -maximum 1 % at intersections
Intersection stopping sight distance (125' SSD allowed for local access streets)
Bus zones -For arterials and neigh. collectors, the designer shall contact metro
Intersections with State Highways
Single access serving more than 100 lots
Driveways
Joint Use Driveways
Sidewalks (both sides for subcollectors and higher classification)
Location and width
Handicapped access ramp (Use updated detail from KC Road Engineer, 3/26/04)
EngineeringReviewChecklistFORM.doc le-ckl-ercheck.pdf 10/10/2005 14 of 16
• •
Activity Number: -------------
KING COUNTY ROAD STANDARDS (1993)
DESIGN REQUIREMENTS fcontlnuedl
OK KCRS
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
3.09
3.10
3.11
4.01
4.01F
4.01F
4.02
4.02
4.03
4.05
5.01
5.02
5.03
5.04
5.05
5.06
5.07
5.08
5.11
6.00
7.02A-D
7.03A
7.03L
7.04A
7.04E
7.05A
7.056
7.05E
8.02
8.03B
School Access -asphalt walkway, sidewalk, or delineated shoulder
Bikeways
Equestrian Facilities
Road Section and Surfacing (drawings 1-001 -1-006)
Note: Neighborhood collectors require 3-inch asphalt concrete.
Perform saw cut of pavement at fog line
Pavement overlay for widening and channelization (show special note as approved by Development
Engineer -see section policies)
Residential street design
Poor subgrade evaluation
Arterial pavement design
Pavement ma_rkings, channelization, and tapers (Requires DOT review)
Rock facings (Dwg. Nos. 5-004 --5-007)
Side slopes, generally 2H:1V
Street trees and landscaping
Mail boxes (Dwg. Nos. 5-010 -5-012)
Street illumination
Survey Monuments to be disturbed are shown
Roadway Barricades
Bollards for walkways or maintenance roads
Roadside obstacles (Note: If variance required for utility pole, the utility company must apply for the
variance.)
Bridges (minimum width 28-feet)
Grass-lined, pipe or rock lined, special designed ditch
Minimum pipe size 12-inch diameter
Beveled ends for culverts in ROW
Maximum spacing between catch basins
CBs taller than 5' (grate to invert) are Type H, Max. depth 12-feet per Dwg. 2-005
Vaned grates
Through curb inlet frames for sag curves a.nd intersections> 4%.
Notes: a) Through curb inlet not used on rolled curb
b) See section policies for policy on three flanking inlets
All covers and grates shall be locking
Utility pole locations and other obstacles
Open cuts on existing roadways, patch requirements
EngineeringReviewChecklistFORM.doc le-ckl-<!rcheck.pdf 10/10/2005 15of16
• •
Activity Number: -------------
KING COUNTY ROAD STANDARDS (1993)
DESIGN REQUIREMENTS !continued)
Notes:
Check out the DOES Web site at www.metrokc.gov/ddes
EngineeringReviewCheck.listFORM.doc le-ckl-ercheck.pdf 10/10/2005 16 of 16
JAEGER ENGINEERING.
9419 S. 204 PLACE -KENT, ,WASHINGTON· 98031
PHONE (253) 850-0934 FAX (253~ 850~0.155.
March 22, 2007
. .
SMALL SITE DRAINAGE . .
TECHNICAL INFORMATION REPORT.
CHAU 3 LOT SHORT PLAT .. ·
17034 1061h A VE. SE .
COUNTY.FILE NO: L03S0016
PREPARED FOR: .
. Ha Minh Chau
. 4101 1501hAve. SE
Bellevue, WA. 98006 · ..
: (425) 643-3993
. /B).tE~[E~IW[Efm
. lJll : APR O 9 2o·oi J1 .
K.C. D.D.E,S •
. PREPAREDBY:
·James J. Jaeg~r, P.E._ ·
. .
. · Le>""? o 1202-z.
I. OVERVIEW
The proposed project is a 3 lot short plat located at the southeast corner
of the intersection of SE 172nd St. and 106th Ave. SE. The property is 0.34
acres and is proposed to divide into 3 new single family lots. two lots of
approx. 4500 SF and a larger lot of approx. 5500 SF. The property is zoned
R-8. There is and existing house and carport that will be demolished and
removed. Also on the site is an gravel driveway that is connected to 106th
Ave. SE. This driveway will also be removed. Access to the new houses
will be a joint driveway (lots 2 and 3) from 106th Ave. SE. and single
driveway (Lot 1) from SE 172nd St.
The project has been submitted for preliminary short plat approval. The
County screening committee has reviewed the initial submittal and
requested additional information, some of which is addressed by this
report. Both of the frontage streets are currently unimproved. Both will be
improved with curb, gutter, sidewalk and pavement widening to meet the
urban sub-access road standard. The pavement widening will be
measured from the centerline of the existing pavement, rather than the
ROW centerline, per discussion with County staff. Additionally, the
frontage improvements along SE 172nd St. will end at the proposed Lot 1
lot line. This was agreed to by the County so that additional ROW would
not be needed to construct the necessary road width. The existing lot
and future lots will be fully served by the existing public utilities.
The site is nearly flat in the northeast corner and then begins an increasing
slope down to the southwest corner. The maximum slope near this corner
is approx. 12%. The site slopes down to both frontage streets. The site
vegetation is primarily tall grass, brush with sporadic trees and shrubs.
There is a row of fir trees along the l 06th Ave. SE frontage. There are no
sensitive areas or hazard designations within this site. This property is
basically a large existing lot on a corner of an older plat.
There are no drainage improvements on the site itself. However, there are
several culverts and ditches along the edges of both street frontages. All
of the ditches drain to an existing culvert located near the southwest
property corner. Along with the proposed new curb, gutter and
sidewalks, the applicant will install a gutter drainage system consisting of
catch basins and piping that will connect to the existing catch basin. This
new gutter system will collect all of the runoff from the half streets along
the frontage as well as the existing ditches upstream from the property.
The new lots will include a roof downspout drainage piping system that
will be connected to the new catch basins. Each lot will also utilize a
-·
perforated stub-out connection as a BMP measure. The project is exempt
from drainage detention and water quality enhancement as will be
shown on the developed drainage section.
Downstream drainage is not addressed in this report. A level l
downstream drainage analysis by CTS Engineers, Inc. was submitted with
the initial short plat application.
"·
PROJECT INFORMATION
Proposal: Short Plat
Location: 17034 I 06th Avenue SE
Renton, Washington 98055
Owner: Ha Chau
Area: Approximately .33 acre
Soils: AgC (Alderwood gravelly sandy loam)
Legal Description: Lot 13, Block 4, Aker's Farms No. 5
Volume 40, Page 27
Tax Parcel No: 008700-0280-07
PROJECT DESCRIPTION
This project proposes to subdivide approximately 1/3 acre of land into 3 (three) lots.
Presently there is a single family residence with carport located at the north side of the
parcel. As a result of the subdivision, the existing house will be partially or entirely
demolished.
The ground consists of lawn, three pine trees in the front yard, a row of small fir trees
along the west property line, and a gravel driveway. The parcel is bordered by S.E. 172"d
Street along the south side, and by 106th A venue S.E. along the west side.
Attached are site pictures, a vicinity map, a soils map, U.S.G.S. aerial topography map,
and a schematic storm drainage plan. These enclosures were used in this analysis as
resources.
DOWNSTREAM ANALYSIS
The ground of the parcel slopes from northeast corner dovm to southeast comer at a
moderate slope of ten (I 0) percent. The sheet flow from the parcel is collected by the
ditches along the south and west property lines. Both of these ditches are located in the
public right-of-way and meet outside of the southwest corner of the property. The west
side and south side ditches are connected via eighteen (18) inch and twelve (12) inch
diameter short culverts, respectively, into a catch basin located in the northeast corner of
the intersection.
There is a twelve (12) inch diameter outgoing reinforced concrete pipe culvert from the
catch basin running diagonally across the intersection at an approximate slope of7.7%.
Page I of2 ct:s
J
This culvert daylights into a wooded ravine that continues to slope down in a
southwesterly direction until it becomes a roadside ditch for the State Route 5 I 5 (Talbot
Road), at a point at least a Y. mile from the proposed subdivision. There are no evident
signs of erosion or capacity problems within this existing downstream storm drainage
conveyance system. Eventually the runoff from the property is part of the Panther Creek
Wetland that is drained into Lake Washington via Green River.
A site visit to verify these conditions was made on March 6, 2003, by CTS Engineers,
Inc.
PROPOSED SITE DRAINAGE IMPROVEMENTS
Each ditch on the south and west of the subject property currently outlets via a short
culvert which connects to an existing catch basin at the NE corner of the intersection of
106th Ave SE and SE I 72nd St. As part of the access improvements to the subdivided
property, it is proposed to replace both existing ditches with culverts, filling each ditch to
the level of street pavement. In addition, the existing catch basin is proposed to be
replaced with a larger catch basin or storm drain manhole. Site drainage and storm runoff
will be directed into below-grade pipes which will connect to the proposed culverts
upstream of the replaced catch basin.
Refer to the attached preliminary storm drainage plan for a graphical representation of the
proposed improvements.
Page 2 of2 c-cs
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®
King County
Department of Development
and Environmental Services
900 Oakesdale Avenue Southwest
Renton, WA 9805S-1219
March 12, 2004
Ha Minh Chau
4101 ISO'h Avenue SE
Bellevue, WA 98006
RE: Preliminary Approval for Short Subdivision No.L03S0016
Dear Ms Chau:
The Land Use Services Division (LUSD) has completed review of the short subdivision
application captioned above. The LUSD finds that the proposed short subdivision complies with
the King County Land Segregation Code (Title 19A), Zoning Code (Title 21A), and other
applicable codes as specified in King County Code (KCC) l 9A.08.060.
The short subdivision is granted preliminary approval subject to the Conditions of Preliminary
Approval attached hereto and incorporated herein by reference. Any aggrieved party may appeal
this decision by the appeal deadline, which is March 29, 2004. The appeal procedure is enclosed
for your infom1ation. The preliminary approval is valid for a period of 60 months from the date of
this letter, unless an appeal is filed. In the event that an appeal is filed, the preliminary approval is
valid for a period of 60 month_s from tlie date of the appeal decision.
Enclosed are the following:
• Notice of Decision
• Conditions of Preliminary Approval
• Appeal Procedure
If you have any questions regarding this letter, please contact Fereshteh Dehkordi, Program
Manager, at (206) 296-7173 and Cm1 Foster, Engineer, at (206) 296-7106.
Curt Foster, P.E:, Senior Engineer
Engineering Review Section, LUSD
Enclosures
cc: Jim Jaeger, Jaeger Engineering
Applicant File
Letter. frm/CoverLtr2000. SP. doc 3/9/00
J <®
King County
Department of Development
and Environmental Services
900 Oakesdale Avenue SW
Renton, WA 98055-1219
File No.
File Name:
CONDITIONS OF APPROVAL
L03S0016
Chau Short Plat
· Application Date: May 2, 2003
Revision Date: January 30, 2004
This short subdivision is granted preliminary approval subject to the following Conditions of
Approval. These conditions are based on a field visit and current information the applicant
has provided about the short subdivision property. Occasionally, in satisfying the Conditions
of Approval, a more definitive land use limitation of the property may be revealed. New
infom1ation (such as final Health approval or sensitive areas review) may require additional
conditions and may reduce the number of lots.
Final approval will be granted after compliance with the Conditions of Approval. Key codes
and guidelines have been noted to provide guidance in preparing the required plans and other
documents. Compliance with some of the following conditions will require that engineering
plans be.prepared by a professional civil engineer licensed in the State of Washington.
1. Title 19A
A.
B.
The short subdivision shall comply with all provisions of Title 19A.
The final review process must be completed prior to recording of the short
subdivision. The Department of Development and Environmental Services
(DDES) strongly recommends the Final Short Plat be submitted at least one
year prior to the expiration date of the project. The Final Short Plat submittal
package includes:
I. A surveyed map page (four sets) including lot area closure calculations;
2. Final health approval from the King County Health Department (different
from preliminary health approval);
3. A current short plat certificate and supporting documents (easements, etc.);
4. Payment of the Final Short Plat submittal fee;
5. A copy of this letter (preliminary approval letter).
A licensed land surveyor shall be hired to prepare the final short subdivision
documents. These documents shall comply with all of the following
conditions for final approval:
f
C. All persons having an ownership interest in the subject property are required to
sign the final short subdivision.
D. If modifications to the approved preliminary site plan (Attachment 1) are
needed to accomplish engineering design or final short plat, then a revised
preliminary site plan shall be submitted to DDES for review and approval.
The revised site plans shall be submitted with the engineering plans or the final
short plat submittal.
2. Surface \Vater Management (KCC 9)
1998 King County Surface \Vater Design Manual (S\VDM)
A. This short subdivision proposal is subject to Full Drainage Review per section
1.1.2.3. Final short subdivision approval shall require full compliancewith
drainage provisions and storm drainage requirements of this section.
Compliance may result in reducing the number and/or location oflots shown
on the approved preliminary short subdivision. The conditions outlined below
are site-specific drainage conditions:
(!) Core Requirement #1 -Discharge at the Natural Location
(2) Core Requirement #2 -Off-Site Analysis
(3) Core Requirement #3 -Flow Control
(4) Core Requirement #4 -Conveyance System
(5) Core Requirement #5 -Erosion & Sedimentation Control
(6) Core Requirement #6 -Maintenance and Operation
(7) Core Requirement #7 -Financial Guarantees & Liability
(8) Core Requirement #8 -Water Quality
(S l) Special Requirement #1 -Other Adopted Requirements
B. A professional civil engineer licensed in the State of Washington shall prepare
a Technical lnfonnation Report and/or engineering plans per Chapter 2, of the
1998 King County Surface Water Design Manual.
3. Health (KCC 13)
This project is exempt from further King County Heath Department review.
However, if improvements are required from the Sewer and/or the Water
District, then verification shall be required from said District(s) that the
improvements have been bonded and/or installed, prior to final recording of
the short plat.
4. Road Standards (KCC 14)
1993 King County Road Standards, Ordinance 11187
Final short subdivision approval shall require full compliance with the provisions set
forth in the King County Road Standards including engineering plans for all road
improvements. The engineering plans shall be prepared by a professional civil
engineer licensed in the State of Washington. DDES strongly recommends the
· Engineering Plans be submitted at least two years prior to the expiration date of the
project.
A. That portion of the North half of SE 172nd Street adjoining the subject property
shall be improved to an urban Sub-access standard per KCRS Section 1.03.
B. That portion of the East half of 106th Avenue SE adjoining the subject property·
shall be improved to an urban Sub-access standard per KCRS Section 1.03.
C. Provide 35' paved radii at the intersection of 106'h Avenue SE and SE 172
Street per KCRS Section 2.10. Dedicate a 25-foot property line radius at the
intersection of 1061h Avenue SE and SE 172nd Street per KCRS Section 2.10.
D. Existing roadside obstacle(s) shall be relocated to provide a minimum
clearance of 10 feet from the edge of the travel lane to the obstacle(s) per
KCRS Section 5.11.
E. Private access to Lots 2 and 3 shall be shown as a joint-use driveway tract per
KCRS Section 3.01. The tract shall be an undivided ownership to the lots it
serves, and the lot owners shall be responsible for its maintenance. The tract
shall be 20-feet wide with a 18-foot-wide paved surface. The tract shall be a
minimum of 20 feet in length.
· F. The following notes shall be shown on the final recorded short subdivision:
1) \Yarning: King County has no responsibility to build, improve,
maintain or otherwise service the private roads contained within or
providing service to the property described in this short subdivision.
2) All private easements and/or tracts to be maintained, repaired, and/or
rebuilt by the owners of the parcels having legal access therefrom and
their heirs, assigns or successors, unless and until such roads are
improved to King County standards and are dedicated and accepted by
King County for maintenance.
G. All utilities within proposed rights-of-way shall be included within a franchise
approved by the King County Council prior to final short subdivision
recording.
•
H. All restrictions, easements, tracts, and their purpose shall be shown on the final
recorded short subdivision.
5. Building and _Construction Standards (Title 16)
Grading. The applicant shall comply with all applicable provisions of KCC 16.82.
6. Fire Code (KCC 17)
Section 902 of the 1997 Edition of Uniform Fire Code
The applicant shall obtain the approval of the King County Fire Protection Engineer
for the adequacy of the fire hydrant, water main, and fire flow standards ofKCC 17.08
prior to recoding of the Jots.
7. Zoning Code (KCC 21A)
A. Density and Dimensions (KCC 2JA.12)
All lots shall meet the density and dimensions requirements of the R-8-SO
zone classification or shall be as shown on the face of the approved prelimi-
nary short subdivision, whichever is larger. Minor revisions to the short
subdivision, which do not result in substantial ·changes and/or do not create
additional lots may be approved at the discretion ofLUSD.
B. Street Trees (KCC 21 A.16)
Street trees shall be provided along that portion of the right-of-way for
I 061h Avenue Southeast and Southeast l 72"d Street abutting the subject
property, pursuant to the provisions ofKCC 2IA.16.050(E) and KCC
21 A.16.190, unless existing trees are shown to be equivalent to the
requirement of Code. See note below. The required street trees shall be
designed as to location and spacing on the final plan submittal. The street trees
must be installed and inspected, or a performance bond posted, prior to
recording of the plat. If a perfonnance bond is posted, the street trees must be
installed and inspected within one year of recording of the plat. At the time of
inspection, if the trees are found to be installed per the approved plan, a
maintenance bond must be submitted, or the performance bond replaced with a
maintenance 'bond, and held for one year. After one year, the maintenance ·
bond may be released after DDES has completed a second inspection and
detennined that the trees have been kept healthy and thriving.
NOTE:
I. KCC 21A.16.050 Landscaping -street frontages. The average
width of perimeter landscaping along street frontages shall be provided as
follows:
"
For single-family subdivisions:
a. Trees shall be planted at the rate of one tree for every 40 feet of
frontage along a neighborhood collector street or arterial street.
b. The trees shall be: ·
I. Located within the street right-of-way if permitted by the
custodial state or local agency;
2. No more than 20 feet from the street right-of-way line when
located within a lot;
3. Maintained by the adjacent landowner unless part of a County
maintenance program; and
4. A species approved by the County if located within the street
right-of-way and compatible with overhead utility lines.
c. The.trees may be spread at irregular intervals in order to
accommodate sight distance requirements for driveways and
intersections.
2. KCC 2IA.16.190 Financial guarantees. Financial guarantees shall
be.required consistent with the provisions of Title 27 A.
C. Significant Tree Retention-KCC 21A.38.230 which applies to the site, a
detailed tree retention plan shall be submitted with the engineering plans for
the subject plat. The tree retention plan (and engineering plans) shall be
consistent with the requirements ofKCC 21A.38.230, as well as the conceptual
tree retention plan which is part of the hearing record for this project. No
clearing of the subject property is pem1itted until the final tree retention plan is
approved by LUSD. Flagging and temporary fencing of trees to be retained
shall be provided, consistent with KCC 21A.38.230B4. The placement of
impervious surfaces, fill material, excavation work, or the storage of
construction materials is prohibited within the fenced areas around preserved
trees, except for grading work pennitted pursuant to KCC 21A.38.230B4d(2).
A note shall be placed on the final plat indicating that the trees shown to be
retained on the tree retention plan shall be maintained by the future owners of
the proposed Jots, consistent with KCC 21A.38.230B6. (Note that the tree
retention plan shall be included as part of the final engineering plans for the
subject plat.) If there are no significant trees as defined by the Special Overlay
District on the site then, this requirement does not apply.
D. The existing house shall be removed or demolished prior to the final approval
and recording. A demolition pennit shall be obtained prior to demolition.
8. Road Mitigation Payment System
The applicant shall comply with Road Mitigation Payment System (MPS), by paying
the required MPS fee as detennined by King County Department of Transportation,
plus an administrative fee. The applicant has an option to either:
A. Pay the MPS fee at final short subdivision recording and the MPS
administrative fee at final short subdivision application, or
B. Pay the MPS fee at building pennit issuance and the MPS administrative fee at
the time of building pennit application.
If option A is chosen, then the following note shall be shown on the final short
plat:
MPS FEE NOTICE:
All fees required by King County code 14.75, Mitigation Payment System
(MPS) have been paid.
If option B is chosen, then the following note shall be shown on the final short
plat:
l\fPS FEE NOTICE:
This short plat is subject to King County Code No. 14.75, King County Road
Mitigation Payment System (MPS). The MPS fees plus the MPS
administrative fee shall be paid at the time of building pem1it application at
the rate in effect at that time.
9. State Environmental Policy Act (SEPA)
This short subdivision was exempt from the provision of the State Environmental
Policy Act (SEPA).
10. Other Considerations
Preliminary approval of this application does not limit the applicant's responsibility to
obtain any required pennit or license from the State or other regulatory body. This
may include obtaining a forest practice pennit from the Washington State Department
of Natural Resources for tree removal.
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JAN 3 u 2004 ,,n r, ! I"~\" •.....-,.--._,.,, --~· r; tii3, r ~· ·--~·
KING COUNTY
LAND USE SERVICES
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C
Transmitted to the following Parties of Record for short plat L03SOO 16:
Cramer Northwest Inc.
945 N. Central Ave., Suite # I 04 Kent, WA 98032
Mr. & Mrs. G.A. Headland
17030 1061h Ave SE Renton, WA 98055
Jay Newton
17006 I 06 1h Ave SE Renton, WA 98055
Trishah Bull, Project Manager II, DOES Land Use Services Division
Curt Foster, Sr. Engineer, DOES Land Use Services Division
Mazen Haidar, Engineer, ODES Land Use Services Division
Rich Hudson, Program Manager III, DOES Land Use Services Division
• . -
C
ATTACHMENT A
RIGHT TO APPEAL
This action may be appealed in writing to the King County Hearing Examiner, with a fee
of$250.00 (check payable to King County Office of Finance).
As required by KCC 20.20.090 and 20.24.090, the appeal period shall be fourteen (14)
calendar days and shall commence on the third day after the notice of decision is mailed.
Filing an appeal requires actual delivery to the King County Land Use Services Division
prior to the close of business (4:30 p.m.) on the date due. Prior mailing is not sufficient if
actual receipt by the Division does not occur within the applicable time period. The
Examiner does not have authority to extend the time period unless the Division is not
open on the specified closing date, in which event delivery prior to the close of business
on the next business day is sufficient to meet the filing requirement.
If a timely Notice of Appeal has been filed, the appellant shall file a statement of appeal
within a 21-day calendar period commencing three days after the notice of decision is
mailed. The statement of appeal shall identify the decision being appealed (including file
number) and the alleged errors in that decision.
The statement of appeal shall state: I) specific reasons why the decision should be
reversed or modified; and 2) the harm suffered or anticipated by the appellant, and the
relief sought. The scope of an appeal shall be based on matters or is.sues raised in the
statement of appeal. Failure to timely file a notice of appeal, appeal fee, or statement of
appeal deprives the Examiner of jurisdiction to consider the appeal.
Appeals must be submitted to the Department of Development and Environmental
Services, addressed as follows:
LAND USE APPEAL
Land Use Services Division
Department of Development and Environmental Services
BlackRiver Corporate Park
900 Oakesdale Avenue Southwest
Renton, WA 98055-1219
A request for a pre-hearing conference may be made by any paiiy. For more infomiation
regarding appeal proceedings and pre-hearing conferences, please contact the Office of
the Examiner for a Citizens' Guide to the Examiner hearings and/or read KCC 20.20 and
20.24.
' ..
II. PEAK RUNOFF FLOWS
A. PREDEVELOPED DRAINAGE
The pre-developed drainage basin includes the entire subject property
plus a portion of the two frontage roads. T,he frontage road areas were
included because the proposed curb. gutter and sidewalk will add new
impervious surface that must be accounted for in the drainage
calculations. The on-site area was calculated to be 0.34 acres. The area
of the frontage road improvements was determined using only the area
from the edge of the existing pavement to the ROW line. The existing road
pavement was not included in the calculations because this area will not
be changed. The frontage area was calculated to be 3982 SF, or 0.09
acres. This provided a total project area of 0.43 acres. The existing house
and gravel driveway also presented existing impervious surface. This
existing impervious surface was calculated to be 0.07 acres. Note that
only 50% of the gravel driveway was counted as impervious surface, per
code. The remaining pre-developed area was considered till pasture.
The pre-developed drainage analysis was performed using the "KCRTS"
hydrology software and its summary tables and charts are attached for
reference. The methods outlined in the 1998 King County Surface Water
Design Manual were used as guidelines. Following this page are the data
sheets used for the computer input data. The computer summary sheets
for peak flows are also attached. Below is a brief description of the
existing drainage characteristics: '
2 year peak flow:
10 year peak flow:
100 year peak flow:
project area:
till pasture:
impervious area:
0.024 CFS
0.040 CFS
0.076 CFS
0.43 acres
0.36 acres
0.07 acres
CHAU SHORT PLAT
KCRTS PEAK FLOW SUMMARY
PRE-DEVELOPED DRAINAGE
Flow Frequency Analysis
Time Series File:chaupre.tsf
Project Location:Sea-Tac
---Annual Peak Flow Rates--------Flow Frequency Analysis-------
Flow Rate Rank Time of Peak --Peaks Rank Return Prob
(CFS) (CFS) Period
0.037 4 2/09/01 15:00 0.076 1 100.00 0.990
0.024 6 1/05/02 16:00 0.042 2 25.00 0.960
0.042 2 2/27/03 7:00 0.040 3 10.00 0.900
0.019 8 8/26/04 2:00 0.037 4 5.00 0. 800
0.024 7 1/05/05 8:00 0.037 5 3.00 0.667
0.040 3 1/18/06 16:00 0.024 6 2.00 0.500
0.037 5 11/24/06 3:00 0.024 7 1. 30 0.231
0.076 1 1/09/08 6:00 0.019 8 1.10 0.091
Computed Peaks 0.065 50.00 0.980
'
'
..
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130.' V, 13, 5) :: 14,lo(Q sF ( 0 ,!>4 ~'-3=
___ -!JJ1---c-L_t:n:~~._J~~\)~I'!'4Ml:: ~·
----Ht:-----rllJ~~~~.oo.:_.· -++· ·c_;··'--"-'24'+'-~ .(a_ ( ) @ ,= 3 '916i · 'SF
= 0,43 Ac-.
2497 SF
II 3 Sr
----m--~~---1-R-=-~a!l;L:Ll.L.-U~d__',1,, ____ __,:.Z..'f4<) SE
= o.o
f;'><IS"I N ~L.~US',.__ _____________ _
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, ..
.,
B. DEVELOPED DRAINAGE
The developed drainage calculations used the same project area as the
pre-developed calculations. The impervious surfaces included the 3 new
houses. 3 new driveways, the joint use driveway and the frontage
improvements for 106th Ave SE and Se 172nd St. The applicant provided
specific house plans for the three new lots. The footprint for these specific
houses was uses as the impervious surface area for the new houses at
each lot. These areas are shown on the attached worksheet. A driveway
for each lot was also calculated using the site plan that was provided by
the applicant. The areas for the driveways were taken directly from the
plan for each new lot. The joint use driveway was calculated to cover the
"worse" condition of extending the full length of the common lot line
between Lots 2 and 3. The required pavement with of 18 ft. was used.
The frontage improvement impervious surface includes the new sidewalk.
curb and pavement widening. The pavement widening width was
calculated using an average width of the additional pavement for both
streets. The developed pervious surface was considered as till lawn.
Similar to the existing condition. the KCRTS method was used to determine
the peak flows for the various storm events. The computer data sheets for
the developed flows follow this page. A brief summary of the developed
drainage characteristics are:
2 year peak flow:
10 year peak flow:
l 00 year peak flow:
total area:
till lawn:
impervious area:
0.075 CFS
0.091 CFS
0.153 CFS
0.43 acres
0.19 acres
0.24 acres
.J
CHAU SHORT PLAT
KCRTS PEAK FLOW SUMMARY
DEVELOPED DRAINAGE
Flow Frequency Analysis
Time Series File:chaudev.tsf
Project Location:Sea-Tac
---Annual Peak Flow Rates--------Flow Frequency Analysis-------
Flow Rate Rank Time of Peak --Peaks Rank Return Prob
(CFS) (CFS) Period
0.075 6 2/09/01 2:00 0.153 1 100.00 0.990
0.060 8 1/05/02 16:00 0.092 2 25.00 0.960
0.091 3 2/27/03 7:00 0.091 3 10.00 0.900
0.063 7 8/26/04 2:00 0.079 4 5.00 0.800
0.076 5 10/28/04 16:00 0.076 5 3.00 0.667
0.079 4 1/18/06 16:00 0.075 6 2.00 0.500
0.092 2 10/26/06 0:00 0.063 7 1. 30 0.231
0.153 1 1/09/08 6:00 0.060 8 1.10 0.091
Computed Peaks 0.133 SO.OD 0.980
.•
f
-----ttt------,---"=--'=""--...._).C\coB.T-1----'-.P-I..-Xl-l-----------
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2-, I
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Ill z.(, 1 to),. 0 ,. s_(g_~""-ci--:::----=-=,3..._J .... 1 ___ _
---=Ill ____ =e')cr--<U?,=...,-~~\~,""'-=~-LQQS...:, _____ l.02.44-5f:
----'+fl~I _________________ :_o ,._4-Ac....
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___ .,li.,-1 ---~,,__\.J~~-~h~ll__,~S" __________ _
'1
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1
1
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Ill
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s 111
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Ill
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l
Ore.c,_ == o , "' -o.._Z,~4--_~~· -·~~n_,_,c...~-'----
R~o:a.
S.
Fo.doc ·, 1.0
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2.. '1'("' = Q.01~ CFS-
)0 'fC' ~ 0. O"t( (:FJ
)Oil ::-{f""· ::: 0,(53 c.!=-S
..
C. HYDRO LOGIC ANALYSIS
The site qualifies for an exemption from Core Requirement #3, Flow
Control. Exemption #3 (page 1-27, attached) is met. This is the peak flow
exemption using flow control BMP's. The 100 year peak developed flow is
0.153 CFS. The 100 year peak pre-developed flow is 0.07 6 CFS. The
difference is 0.077 CFS. which is less than 0.1 CFS limit to qualify for this
exemption. In addition, the site is a re-development project and is not
located within a critical drainage area or a landslide hazard drainage
area. The project is a single family residential project; also needed to
qualify for this exemption.
The flow control BMP used for this project is the perforated stub-out.
Individual lot infiltration is not an alternative because the soils ore of the
Alderwood series (hydrologic group C). These soils have slow permeability
rotes and high ground water. Also. the size of the lots would not allow the
required setbacks for an infiltration system or for a splash block. The
remaining BMP allowed by the code is the perforated stub-out.
D. WATER QUALITY CONTROL
The site also qualifies for an exemption from Core Requirement #8. Water
Quality. Exemption # 1, surface area exemption (page 1-50. attached) is
met. The developed site will be adding less than 5000 SF of new
impervious surface subject to vehicular traffic (PGIS). The new PGIS area
includes the 3 new driveways for each lot. the joint use driveway and the
pavement widening along both frontage roads. The totals for these
areas ore:
• 3 driveways: 546 SF
• joint driveway: 1350 SF
• 106 Ave. widening: 236 SF
• 172 St. widening: 135 SF
TOT AL: 2267 SF
This does not count the existing gravel driveway that is being removed
(credit for 50% of the area). This does show that the project meets the
requirements for the surface area exemption.
.,
1.!.3 CORE REQUIREME."ff #3: FLOW CO:S'lllOL
0 EXEMPTIONS FROM CORE REQUIREMENT #3
There are eight possible exemptions from the requirement 10 provide a formal flow control facility per
Core Requirement #3. The intent of these exemptions is 10 prol'ide for situations where a facility may not
be practical or needed, where other alternatives to a facility can be just as effective, or where it makes
sense to provide incentives for retaining native vegetation or for maximizing use of existing developed
areas.
1. Impervious Surface Exemption
A proposed project or any threshold discharge area within a project is exempt if less than 5,000
square feet of new impen·ious surface will be added and the project or threshold discharge area is not
within a Landslide Hazard Drainage Area.31 If the project or threshold discharge area is located
within a Landslide Hazard Drainage Area, this exemption only applies to new impervious surface less
than 2,000 square feet.
2. Impervious Surface Exemption Using Flow Control BMPs
Any threshold discharge area within a proposed project is exempt if less than 10,000 square feet of
new impen·ious surface will be added, AND all of the following criteria are met:
a) The area cleared to accommodate the proposed project must be less than 35% or less than 2 acres
of the threshold discharge area (whichever is greater), .t,ND
b) If the project is a single family residential project, flow control BMPs must be applied within
the threshold discharge area as specified in Small Sire Drainage Requirements (detached
Appendix C), AND
c) For projects other than single family residential projects, the new impen·ious surface within
· the threshold discharge area must be comprised of either non-pollution-generating roofs that
comply with the roof downspout controls in Section 5.J. OR roads, trails, or driveways that
· · comply with the rural roadway dispersion requirements in Section 5.2. l, AND
d) The manner in which runoff is discharged from the.project site must not create a significant
adverse impact per Core Requirement #l.
3. Peak Flow Exemption Using Flow Control BMPs
Any threshold discharge area within a proposed project is exempt if the project improvements within
the threshold discharge area generate less than a 0. l cfs increase in the exisring sire condirions" l 00-
year peak flow rate, AND all of the following criteria are met:
a) If the project is a redevelopment project, flow control BMPs must be applied as specified in
Section 5.2, and the project improvements must not significantly impact a "severe erosion
problem" or "severe flooding problem" (see page 1-21), and must not be located within a
Landslide Hazard Drainage Area, AND
b) If the project is a single family residential project, the runoff from impervious surfaces must be
infiltrated or dispersed using flow control BMPs specified in Appendix C, and any areas of native
3, Landslide Hazard Drainage Areas are delineated on a map adopted with this manual (see map pocket on inside of back
cover).
32 Existing site conditions depend on what, if any, land conversion activity has occurred on the si1e since May 1979 when King
County first required flow control on developments adding more than 5,000 square feet of new impervious surface. IF a
drainage plan has been approved by the County since May 1979 for any land conversion activity which in dudes the addition of
more than 5,000 square feet of new impervious surface, THEN existing site conditions are those created by the site
improvements and drainage facilities·constructed per the approved engineering plans. OTHERWISE, existing site conditions
are those that existed prior to May 1979 as determined from aerial photographs and, if necessary, on knowledge of individuals
familiar with the area. The intent is 10 mitigate unac'dressed impacts crealed by site alterations or improvements, such as
clearing, which have occurred since May 1979.
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SECTIO~ 1.2 CORE REQl:lREMENTS
9/1 /98
vegetation assumed not to be cleared for the purposes of computing the increase in I 00-year peak
flow must be preserved within a tract or by covenant as described in Appendix C, AND
c) For projects other than redeYelopment projects and single family residential projects, the
new impervious surface within the threshold discharge area must be comprised of either non-
pollution-generating roofs that comply with the roof downspout controls in Section 5.1, OR roads,
trails, or driveways that comply with the rural roadway dispersion requirements in Section 5.2.1,
AND
d) The manner in which runoff is discharged from the project site must not create a significant
adverse impact per Core Requirement #1.
4. Peak Flow Exemption for Urban Redevelopment Projects
Any natural discharge area of a redevelopment project located within the Urban Growth Area is
exempt if the project improvements within the natural discharge area generate Jess than a 0.1 cfs
increase in the existing site conditions I 00-year peak flow, AND all of the following criteria are met:
a) The application of this exemption to natural discharge areas within a proposed project must not
result in more than a 0.4 cfs increase in the existing site conditions I 00-year peak flow rate for any
threshold discharge area of the project, AND
b) Flow control BM:Ps must be applied to the runoff from new impervious surfaces as specified in
Section 5.2.l, AND
c) The project improvements within the natural discharge area must not be located within a
Landslide Hazard Drainage Area and must not significantly impact a "seYere erosion problem"
or "senre flooding problem" (see page 1-21), AND
d) . The manner in which runoff is discharged from the project site must not create a significant
adYerse impact per Core Requirement #1.
5. · Forested Open Space Exemption for Rural Residential Projects
Any natural discharge area within a proposed rural residential project (zoned RA-2.5, RA-5. RA-I 0,
or RA-20) is exempt if all of the following criteria are met:
a) At least 65% of the unsubmerged portion" of the natural discharge area will be set aside as
forested open space as specified in Section 5.2. J, Al'ID
b) The runoff from new impervious surfaces within the natural discharge area will be dispersed over
native vegetation using the flow control Bll!Ps detailed in Section 5.2.l, AKD
c) The manner in which runoff is discharged from the project site will not create a significant
adverse impact per Core Requirement #1.
6. Direct Discharge Exemption
Any natural disch.arge area within a proposed project is exempt if it drains to one of the "major
receiYing waters" listed in Table J .2.3.B, AND meets all of the following criteria for direct
discharge34 to that receiving water:
a) The flowpath from the project site discharge point to the edge of the I 00-year floodplain of the
major receiving water shall be no longer than a quarter mile, except for discharges to Lake
Sammamish, Lake Washington, and Puget Sound, AND
b) The conveyance system between the project site and the ordinary high water line of the major
receiving water shall be comprised of manmade conveyance elements (pipes, ditches, outfall
33 Unsubmerged portion means any portion outside the ordinary high water line of streams, lakes, and wetlands.
34 Direct discharge means undetained discharge from a proposed project to a "major receiving water."
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SECTION 1.2 CORE REQUIREME1'TS
• Special Requirement #5: Oil Control, Section 1.3.5 (p. 1-62}--This requirement applies special oil
controls to those projects proposing to del'elop or redevelop a high-use site.
Key Definitions
• Pollution-generating impervious surface (PGIS) Definition: Those impervious surfaces considered
to be a significant source of pollutants in storm water runoff. Such surfaces include those which are
subject to vehicular use" or storage of erodab/e or teachable materials, wastes, or chemicals," and
which receive direct rainfall or the run-on or blow-in of rainfall.'' Metal roofs are also considered to
be PGIS unless they are treated to prevent leaching.
• Pollution-generating pervious surface (PGPS) Definition: Any non-impervious surface with
vegetative ground cover subject to use of pesticides and fenilizers. Such surfaces include. but are not
limited to, the lawn and landscaped areas of residential or commercial sites, golf courses, parks and
spons fields.
__,,....-_>.,.._ D EXEMPTIONS FROM CORE REQUIREMENT #8
9/1/98
There are five possible exemptions from the requirement to provide a formal water quality facility per
Core Requirement #8:
1. Surface Area Exemption
A proposed project or any threshold discharge area within a project is exempt if it meets all of the
following criteria:
a) Less than 5,000 square feet of new PGIS'' will be added. AND
b) Less than 5,000 square feet of contiguous PGJS''. will be created through any combination of new
and/or replaced impervious surface as pan of a redevelopment project, AND
c) Less than I acre of contiguous PGPS'' will be added and/or modified," OR there is a formal
· agreement with King County to implement a landscape management plan53 for the PGPS areas on
the site (or a farm management plan in the case of an agricultural land use).
46 A suriace, whether paved or not, shall be considered sutiject to vehicular use if it is regularly used by motor vehicles. The
following are considered regularly·us'ed surfaces-. roaCs, unvegetated road shoulders, bike lanes within the traveled lane of a
roadway, driveways, parking lots, unfenced firelanes, diesel equipment storage yards, and airport runways. The following are
not considered regularly-used surfaces: road shoulders primarily used for emergency parking, pa\led bicycle pathways, bicycle
lanes adjacent to unpaved or paved road shoulders primarily used for emergency parking, fenced firelanes, and infrequently
used maintenance access roads.
47 Erodable or leachable materials, wastes, or chemicals are those substances which, when exposed to rainfall, measurably alter
the physical or chemical characteristics of the rainfall runoff {examples include erodable soil, uncovered process wastes,
manure, fertilizers, oily substances, ashes, kiln dust. garbage dumpster leakage, etc.).
48 A covered parking area WOl:Jld be considered pollution-generating if runoff from uphill could regularly run through it, or if rainfall
could regularly blow in and wet the pavement surface. The same parking area wou!d not be included if it were enclosed by
walls or if a low wall and benn prevented stormwater from being blown in or from running onto the covered area.
49 New PG/5 means new impervious surface {as defined on page 1--4) that is pollution-generating.
5° Contiguous PG!S means a discrete patch of PGIS that is all together as opposed to being separated in different locations on
the project site. As used in this and other exemptions, the intent is to apply Core Requirement #8 to those redevelopment
projects that are replacing and/or adding enough impervious surface in one location to allow for opportune installation of a
water quality facility.
51 Contiguous PGPS means a patch of PGPS that is all together as opp~sed to being separated in different locations on the
project site.
52 Modified PGPS means any existing PGPS that is re-graded or re-contoured by the proposed project.
53 Landscape management plan means a King County approved plan for defining the layout and long-term maintenance of
landscaping features to minimize the use of pesticides and fertilizers, and to reduce the discharge of suspended solids and
other pollutants. Guidelines for preparing landscape management plans can be found in Reference Section 4-A. Submir.al
requirements are detailed in Section 2.3.1.4.
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