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HomeMy WebLinkAboutMiscI
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[P)~~[bD~D[NJ~IRnr
If'~~[K]INlD~~[b 0 [NJ[F(Q)~M~ LrD(Q)1Nl [Ri~jp)(Q)~Lr
CityOfR
Planning D.e~ton
IVISion
JUL 1 0 lI}(J9
1R1~©~U~~@
Proposed Ren~o81 Gateway Center
750 West Perimeter Road
Renton Airport, Renton, Washington 98055
Prepared for:
Pro Flight Aviation Inc.
243 West Perimeter Road
Renton, Washington 98055
June 26, 2009
Our Job No. 12564
~i i
CIVIL ENGINEERING, LAND PLANNING, SURVEYING
18215 72ND AvENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX
BRANCH OFFICES <> OLYMPIA,WA <> TACOMA,WA <> CONCORD,CA <> TEMECULA,CA
www.barghausen.com
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1.0
2,0
3,0
TABLE OF CONTENTS
PROJECT OVERVIEW
Figure I -Technical Information Report (TIR) Worksheet
Figure 2 -Site Location
PRELIMINARY CONDITIONS SUMMARY
2, I Analysis of the Five Core Requirements
2.2 Analysis of the Special Requirements
OFF-SITE ANALYSIS
12564,OOldoe
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I 11.0 PROJECT OVERVKEW
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1.0 PROJECT OVERVIEW
This site is located within a portion of the Southwest quarter of Section 7, Township 23 North,
Range 5 East, Willametle Meridian, City of Renton, King County, Washington, and comprises
approximately 1.47 acres. More particularly, the site is located at 750 West Perimeter Road,
Renton Airport, Renton, Washington. The attached Vicinity Map gives the exact location of the
project site.
The proposal for this development is to construct eight aircraft hangars, six of which will be used
for aircraft storage, and two of which will be used for maintenance of aircraft, along with an
additional building for the purpose of providing pilot concierge service. In addition, existing
asphalt on the site will be modified and replaced with new asphalt to allow for the parking of
approximately 24 automobiles along the west side of the proposed hangar structures.
The existing site is almost entirely imperviolls surface consisting of buildings and pavement with
the remaining area of gravel or dirt. Under proposed conditions, much of this gravel/dirt area will
be converted into landscaping, which should actually decrease the amount of runoff coming off
the project site; however, the total impervious surface on the project site will increase by a slight
amount of approximately 900 square feet. Detention and water quality are not proposed nor
required for this project site.
There is an existing 7-foot by 5-foot reinforced concrete box culvert located underneath Perimeter
Road immediately west of the project site that this site will drain to. There are existing catch
basins on the project site that discharge into this reinforced concrete box culvert that will be
utilized with this new development.
Since this project site is located on a portion of an airport, the project site is relatively flat in
nature. It is anticipated there will be minimal grading to OCCllr, with site grades staying much the
way they are. Please refer to the existing and proposed Site Land Coverage table on the
following pages of this repOlt for a complete description of the site land covers.
12564.003.doc
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EXISTING AND PROPOSED SITE LAND COVERS
Existing Condition:
Building 1,165 SF
Pavement 45,162 SF
Gravel/Dirt 17,682 SF
TOTAL ~ 64,009 SF
Proposed Condition:
Building ~ 30,150SF
Pavement ~ 16,897 SF
Concrete 198 SF
Landscaping ~ 13,759 SF
Gravel/Dirt 3,005 SF
TOTAL ~ 64,009 SF
12564 .003.doc
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JF][GURE ]
TECHNICAL ][NJFORMAT][ON
REPORT ('fIR) WORKSHEET
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Page 1012
King County Building and Land Development Division
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
Project Owner Pro FlightA'lialion.-Llnrnc'--___ _
Address 243 West Perimeter Road Renton WA 98055
$ ;
Phone (425)228-9510
Project Engineer Costa Pbilippides
Company Barghausen Consulting Engineers, Iwoc"----__
Address Phone 182 J 5 -nnd Avenue South, Kent, WA
D Subdivision
o Short Subdivision
[XJ Grading
[XJ Commercial
C] Other
,~= ·(_lk:Jillei~l.:J~
Community
Renton
Drainage Basin
Lake Washington
"'~.'.'.' . .. ~:
D
0
D
0
D
Project Name Renton Gateway Center
Location
Township .1lJ'!ru:th __ _
Range 5 East
Section -'7'----__ _
Project Size J 47 Acres AC
Upstream Drainage Basin Size ____ AC
DOF/GHPA 0 Shoreline Management
CaE 404 0 Rockery
DOE Dam Safely 0 Structural Vaults
FEMA Ftoodplain !XI Other NPDES
COEWeliands D HPA
D River ______________ _ D Floodplain ______________ _
D Stream _____________ _
o Critical Stream Reach o DepressionS/Swales
D lake
D Steep Stopes
D LakesidelErosion Hazard
D Wetlands _______________ _
D Seeps/Springs
D High Groundwater Table
D Groundwater ReCharge
D Other
SOIl!S'~ '.' , ,,"""""r~~~~~~-------~-:J
~"~_-...""~a~,~","""".~>i~~ ..... ~"'~~~""""',~,_~="'~~~ ... ,.....,,~~''''''-
SoitType
Urban Land
stopas
------',----
D Additional Sheets Altatched
12564.004.pdf
Erosion Potential E(Qsive Velocities
1/90
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Page 2 of 2
King County Building and Land Development Division
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
Imffi]@ i'iJ3YlID<.jiO!l'illlIDfllh~IWti[.® ..
0 .
REFERENCE LIMITATION/SITE CONSTRAINT
0 Ch. 4 -Downslream Analysis --------
0 -
0
0
0 -
0
0 Additional Sheels Matched
Imffi]@ ~l;I:('! 1I;j;!ltI:hhj;j ..... 0
0
MINIMUM ESC REOUIREMENTS MINIMUM ESC REQUIREMENTS
DURING CONSTRUCTION FOLLOWING CONSTRUCTION
!Xl Sedimentation Facilitios [Xl Stabilize Exposed Surface
!Xl Stabilized Construction Enlrance IX1 Remove and Rostore Temporary ESC Facilities
!Xl Perimeter Runoff Control OCI Cloan and Romove All Silt and Debris
0 Clearing and Grading Restrictions [Xl Ensure Operation 01 Permanent Facilities
0 Cover Practices 0 Flag limits of NGPES
IX! Conslruction Sequence 0 Other
0 Other
!a'i!ill'® ~15!b.§@iI€Xkilili'LJ
0 Grass lined Channel 0 Tank 0 Infiltration Method of Analysis
!Xl Pipe System 0 Vaull 0 Depression
0 Open Channel 0 Energy Dlssapator 0 Flow Dispersal CompensationlMitigation
0 Dry Pond 0 Wetland 0 Waiver of Eliminated Site Storage
0 Wet Pond 0 Stream 0 Regional Detention
Brief Description of System Operation Catch basin collection to pipe conveyance to discharge off site.
Facility Related Site limitations
Reference Facility Umltation
o Additionat Sheets Attatched
o Drainage Easement
o Cast in Plaoe Vaull 0 Other o Access Easement
o Retaining Wall o Native Growth Protection Easement
o Rackery> 4'High o Tract o Structural on Stoop Slope o Other
I or 0 civil onginoor undor my suporvision hovo visitod Iho sito. Actual ./'1 A "
sito conditions os obsorvod ware incorporated into this workshoot and the £..L,.A~~~ ~.r Lt.J /_ .. ?4-Jl1C
altatchments. To tho best of my knowlodgo the information providod ru c,..--LV'I hero.~s nccurato. -.-----------------------,"/---;1/'--"/7/71'7"'"-<-"""'"---"-'"-----__ _
12564.004.pdf (/ f/ {/'-·---ltiO
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I FKGURE 2
SK'fE LOCATKON
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~""'---"1--------"
~
REFERENCE: Thomas Guide (2006)
Horizontal: N. r.S . VfHticaI: HlA
18215 72NDAVENUE SOUTH
KENT, WA 98032
(425) 251-6222
(425) 251-6782
CIVIL ENGINEERING, lAND PlANNING ,
SURVEYING , EtMRONMENTAL. SERVICES
P:\12OOOa\125tU\8xhlblt\12504 vrnap .cdr
For:
RENTON GATEWAY CENTER
RENTON, WASHINGTON
Title:
VICINITY MAP
Job Number
12564
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I 2.0 PRJEJLlIMlINARY CON]]J)lI],lIONS SUMMARY
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I 2.0
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PRELIMINARY CONDITIONS SUMMARY
2.1
2.2
Analysis of the Five Core Requirements
Core Requirement No. I: Discharge at the Natural Location.
Resl)onse: This site will discharge into the 7-foot by 5-foot reinforced concrete box
culvert underneath Perimeter Road. which courses in a northerly direction on the west
side of the project site just as it does under existing conditions. Therefore, this Core
Requirement is met.
Core Requirement No.2: Ojj:Site Analysis.
Response: No off-site analysis is required for this project site as it is an already
developed site and the City is well aware of the downstream drainage course from this
project site. In addition, the site has almost direct discharge into Lake Washington at the
northern end of the airport.
Core Requirement No.3: RunofJContraJ.
Response: Since only 900 square feet of impervious surface is being added with this
project, runoff control in the form of detention is not a requirement for this project site.
The entire existing site could be considered impervious surface.
Core Requirement No.4: Conveyance System.
Response: The conveyance system for this project site will be sized in accordance with
the 1990 King County Surface Water Design Manual such that the Modified Rational
Method will be utilized to size the conveyance elements for this project site with a
3.4-inch 25-year precipitation rate, a Manning's 'n' value of 0.014, and an initial time of
concentration of 6.3 minutes. This is a very conservative sizing methodology and
provides safe conveyance elements.
Core Requirement No.5: Temporm), Erosion and Sedimentation Control.
Response: A temporary erosion and sedimentation control plan will be prepared with
this project such that clearing limits will be specified, cover measures will be utilized
should there be stockpiling of dirt anywhere on the project site, perimeter protection will
be installed in the form of silt fences along the downstream perimeter of the project site
to prevent sediment-laden runoff from leaving the project site, traffic area stabilization
will be provided in the fonn of a rock construction entrance with the adjacent streets
being swept on a daily basis should be sediment be tracked off site, and dust control will
be utilized should this project be constructed during the drier summer months.
Analysis of the Special Requirements
Special Requirement No. I: Critical Drainage Areas.
Response: This site is not located within a critical drainage area; therefore, the
requirements of Special Requirement No. I do not apply.
12S64.003.doc
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Special Requirement No.2: Compliance with an Existing Master Drainage Plan.
Response: This project site does not lie within an area with a master drainage plan.
Special Requirement No.3: Conditions Requiring a Master Drainage Plan.
Response: This project site does not meet the threshold of this special requirement;
therefore, a master drainage plan is not required.
Special Requirement No.4: Adopted Basin or Community Plan.
Response: This project site does not lie within an adopted basin or community plan to
the best of our knowledge.
Special Requirement No.5: Special Water Quali(v Controls.
Response: The City has already indicated special water quality controls will not be
required for this project site.
Special Requirell/ent No.6: Coalescing Plate Oil/Water Separator.
Response: This project does not meet the threshold of this Special Requirement and does
not require any coalescing plate oillwater separators.
Special Requirement No.7: Closed Depressions.
Response: This project site does not discharge runoff to an existing closed depression.
Special Requirement No.8: Use of Lakes, Wetlands, or Closed Depressions for Peak
Rate Runoff Control.
Response: This project is proposing the use of a lake for peak rate runoff control;
however, the requirements of this Special Requirement do not apply to this site.
Special Requiremellt No.9: Delineatioll of 100-Year Floodplain.
Response: This project abuts a lake; however, it is an airport and the site is well above
the elevation of the lake and the lake has a secure outfall. Therefore, there is no IOO-year
floodplain on this project site.
Special Requirement No. 10: Flood Protection Facilities/or Type 1 and 2 Streams.
Response: This project does not meet the threshold of this Special Requirement.
Special Requirement No.1 I: Geotechnical Analysis and Report.
Response: The geotechnical analysis and report for this project have been waived per the
City of Renton.
12564.003.doc
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Special Requirement No. 12: Soils AnaZ)'sis and Report.
Response: As mentioned in response to Special Requirement No. II, the soils analysis
and report have been waived for this project site.
I 2564.Q03.ooc
• • • • • • • • • 3.0 OFF-SITE ANALYSIS
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• • • • • '. • • •
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3.0 OFF-SITE ANALYSIS
No off-site analysis is required for this project site as the site discharges almost immediately into
a 7·foot by 5-foot reinforced concrete box culvel1, which discharges in a northerly direction
towards the end of the airport and directly into Lake Washington. The City is well aware of this
downstream drainage course and it is more than adequate to convey the runoff from this project
site, which it does under existing conditions that are matched almost exactly to the proposed
conditions as far as land covers go.
125M.OOl.doc