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Home My WebLink About03739 - Technical Information Report � � � � Renton 7 Short Plat Nile Avenue SE and SE 2nd Court �' Renton, Washington 98056 LUA13-001214, SHPL-A , Utility Permit #U14001204 o -- � .� C� 1 �4 c 313 `� � TECHNICAL INFORMATION REPORT Final July 1, 2014 , i Prepared for: 7ayMarc Homes Attn: Gary Upper 7525 SE 24"' Street Suite #487 Meroer Island, Washingbon 98040 (206) 390-3800 office aEN�°N c��c�1vE0 J��- �� 2�`� � NG�1��S�o �V��-°� , Prepared by: Offe Engineers, PLLC Darrell Offe, P.E. A O� 13932 SE 159"' Place � Renton, Washington 98058-7832 0 � (425) 260-3412 office �? x (425) 227-9460 fax � � darrell.offe@comcast.net 1 \ �a��,� } j � ti fax��o i �1, � � , �� 3 �39 � . . .. . .. �-i..;fi t: � `fi ;4r��:�,1;"-F�'4�ji,'��;�'`;� 3 �p:�1 �:y`, Y °!'�J +� '� "r • R' . `�1.� �� ti ;. /�, .;'� y'�.�..0 � .. �'. 4.� `�' . +�'�� r�'�� r ..�•;t�t��_•'i! •T,�� _ `.�C i"'' .;�..it . �-. 3. t , ! ♦ t �4 � � �r � � S � ,, � �� , - t � , . . � .. �`' r Table of Contents • Technical Information Worksheet • Section 1: Project Overview • Section 2: Conditions and Requirements Summary � Section 3: Offsite Analysis • Section 4: Flow Control and Water Quality Facility Analysis and Design • Section 5: Conveyance System Analysis and Design • Section 6: Special Reports and Studies • Section 7: Other Permits • Section 8: CSWPPP Analysis and Design • Section 9: Bond Quantities, Facility Summaries, and Declaration of Covenant • Section 10: Operations and Maintenance Manual ` TECHNICAL INFORMATION WORKSHEET ; �� -�I - �_.� �� , � � 'I , �� r ' ' � City of Renton TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND Part 2 PROJECT LOCATION AND PROJECT ENGINEER DESCRIPTION Project Owner: JayMarc Homes Project Name: May Creek Court Short Plat Address: 7683 SE 27TM Street Suite #487 Location Mercer Island, WA 98040 Township: 23 North Phone: (206) 390-3800 Range: 5 East Project Engineer: Darrell Offe, P.E. Section: 15 Company: OfFe Engineers, PLLC Address/Phone: 13932 SE 159th Place Renton, WA 98058 �I 425 260-3412 '� Part 3 TYPE OF PERMIT Part 4 OTHER REVIEWS AND PERMITS ' APPLICATION Subdivision ❑ DFW HPA ❑ Shoreline Management X Short Subdivision ❑ COE 404 Rockery ❑ Grading ❑ DOE Dam Safety Structural Vaults ❑ Commercial ❑ FEMA Floodplain X Other NPDES ❑ Other ❑ COE Wetlands Part 5 SITE COMMUNITY AND DRAINAGE BASIN Community North Renton Drainage Basin Maplewood Creek / Cedar River/ Lake Washington Part 6 SITE CHARACTERISTICS ❑ Ri�er ❑ Floodplain ❑ Seeps/Springs ❑ Stream ❑ High Groundwater Table ❑ Critical Stream Reach � Groundwater Recharge ❑ Depressions/Swales ❑ Other ❑ Lake ❑ Steep Slopes Part 7 SOI LS Soil Type Slopes Erosion Potential Erosive Velocities Qva 10—25% minor ❑ Additional Sheets Attached Part 8 DEVELOPMENT LIMITATIONS REFERENCE LIMITATION/SITE CONSTRAINT ❑ Ch. 4—Downstream Analvsis ❑ ❑ ❑ ❑ � ❑ � Additional Sheets Attached Part 9 ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION ❑ Sedimentation Facilities ❑ Stabilize Exposed Surface � ❑ Stabilized Construction Entrance ❑ Remove and Restore Temporary ESC Facilities ❑ Perimeter Runoff Control ❑ Clean and Remove All Silt and Debris ❑ Clearing and Grading Restrictions ❑ Ensure Operation of Permanent Facilities ❑ Cover Practices ❑ Flag Limits of SAO and open space ❑ Construction Sequence preservation areas � ❑ Other � Other � Part 10 SURFACE WATER SYSTEM ❑ Grass Lined Dispersion Infiitration Method of Analysis Channel ❑ Energy Dissipater � Depression 2009 City of Renton ❑ Pipe System ❑ Flow Dispersal Manual ❑ Wetland Compensation/Mitigati ❑ Open Channel � Stream � Waiver on of Eliminated Site ❑ Dry Pond n Regional Storage Detention Brief Description of System Operation: Catch basins within curb line of street, conveyance to a new storm water pond discha�ging into an existing storm system within Nile Avenue NE. Facility Related Site Limitations Reference Facility Limitation Part 11 STRUCTURAL ANALYSIS Part 12 EASEMENTS/TRACTS X Drainage Easement Cast in Place Vault �� u Retaining Wall X Access Easement Rockery> 4' High Tract I ❑ Structural on Steep Slope I' ❑ Other ❑ Other I Part 13 SIGNATURE OF PROFESSIONAL ENGINEER I or a civil engineer under my supervision my supervision have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attachments. To the best of my k dge the information provided here is accurate. 2 /� Z S� ned/Da i � Section 1: Project Overview The proposal is to create seven individual single family lots from this 77,199 square foot parcel (1.77 acres) located in the Renton Highlands, off of Nile Avenue NE and NE 2"d Street. The property will take access off of Nile Avenue NE from a new public road. The property has no existing address due to no structures, the King County tax parcel number is 084710-0041. The property is covered with several trees and blackberry � understory. The property slopes from the no�th towards the south in the existing condition. The properly is located within the"existing conditions"area of the drainage basin map. There are no sensitive areas on the project site. The property has a gentle slope of approximately 10% ' towards the south. The soils on the site have been identified by a Geotechnical Engineers as"glacial ', consolidated till"(Qgt). Tt�ese soils are not suitable for Full Infiltration of storm water runofF. A storm water ', detention pond is proposed on the development to treat the future runoff of the proposed project. The facility will be sized using the 2009 City of Renton Drainage Manual. Lot mitigation will consist of`�limited Infiltration", sheet flow dispersion, and perforated pipe connection. � � i ; � I Section 2: Conditions and Requirements Summary The preliminary conditions of approval for the short plat are attached. An overview of the Core Requirements are outlined below, further discussion of these requirements can be found within the remainder of this report. Core Requirement No. 1—Discharge at Natura/Loca�ion The current property has no single point of discharge; the runoff leaves the property along the south side and flows south and east into Nile Avenue NE. The proposed developed property is to collect the runoff into a storm water pond located in the south-central portion of the property, convey the flow from the pond into the existing storm system within Nile Avenue NE. Core Requirement No, 2—Offsite Ana/ysis The surrounding properties are developed with single family housing. A developed area adjoining the project to the north was recently developed with a storm water facility located along the northwest corner of the Renton 7 property. The pond is connected to the drainage within Nile Avenue NE with a storm conveyance pipe just off the north property line. However, an overtlow notch in the pond wall was placed as to allow the overflow of the pond to flow onto Renton 7, Lot 4. This potential overtlow scenario will be collected within a proposed swale and conveyed around Lot 4 into the Renton 7 pond. The property to the west slopes away from Renton 7 and does not contribute flows onto this project. To the east is Nile Avenue NE, a fully developed road section including a storm conveyance system. There is no off site drainage contributing to the Renton 7 property unless in an overFlow condition. Core Requirement No, 3—F/ow Control The property is located within the Gty of Renton, Flow Control Duration Standard, Forested Conditions. The storm water runoff from the proposed development will be to: mitigate on the lots, up to 1,200 square feet of impervious area using"limited infiltration"standards and collect the remainder of the lot and roadway drainage into a single storm water facility. The facility will be sized for 3,200 square feet of impervious runoff per lot and the roadway within the project. The storm water facility will be conveyed from the internal pond to the storm system within Nile Avenue NE, to the east. � Core Requirement No. 4—Conveyance System The proposed on-site conveyance improvements will include curb, catch basins and a pipe network for collection of surface runoff from landscape,driveways, roadways, and sidewalks. The review and analysis of this proposed conveyance system includes calculations that are provided as part of this report. The proposed runoff was analyzed using the"Rational Method of Analysis"at the 25 year event. The proposed overflow system was analyzed at the 100 year event. Core Requirement No. 5—Erosion and Sediment Contro/ A Temporary Erosion and Sediment Control Plan implementing the Best Management Practices have been included within the civil plans. The project eacceeds the State requirements of clearing over 1 acre in size. Therefore the developer is aware of this and is proceeding with obtaining the necessary State permits. The temporary pond facility has been sized using the 2 year— 15 minute interval storm event. The calculations for the temp. pond are included within this report. Core Reqwirement No. 6—Maintenancae and Operations The Maintenance and Operations for the Renton 7 short plat include both a public and private system. Within this report are the maintenance requirements for the facilities being installed as part of the plat and the facilities to be installed as part of the residential building permits. il ' t Core Requirement No. 7—Financia/Guarantees and Liabi/ity The Financial Guarantees and Liabilities will be required prior to the project being finalized by the City of Renton. Bond Quantity worksheets are provided within this report. Core Requirement No. 8— Water Qua/ity The project is required to provide water quality (WQ) treatment. The WQ has been provided within the storm water treatment pond. Sizing for this portion of the pond are included within section 4. �' DEPARTMENT Of COMMUNITY cl�y°f � ( � ��= �F:. ;��.r ,��:., AND ECOI�[DMIC DEVELOPMENT "— ��,,�__� °,�-.� _ ��;� �� - - , _ ADMINISTRATIVE SHORT PLAT REPORT & DECISION , A. SUMMARYAND PURPOSE OF RFQUEST REPORT DATF: November 20, 2013 ' Pro1ect Name: Renton 7 Short Piat Owner: Blake Famify Trust; PO Boxes 2566; Renton,WA 9805b Applicant: Jay Marc Homes;7683 SE 27t`', Suite#487; Mercer Island, WA 98040 Contact: Darrell Offe;Offe Engineers, PLLC; 13932 SE 159th Place; Renton,WA 98058 �ile Number: LUA13-001214,SHPL-A Project Manager: Rocale 7immons,Senior Planner _. Project Summary: The applicant is requesting Administrati�e Short Plat approval for the subdivision r of a 1.77 acre parcel into 7 lots .for the future construction of single family residences. The project site is currently vacant and located w�thin the Residential - 4 (R-4} dwelling units per acre zoning classification. The proposed lots would range in size from 8,002 square feet in area to 9,030 sq�are feet Access to the site would be provided via a new 45-faot wide pubiic road extended from Nile Ave NE.There are no critical areas iocated on site. Profect Location: Nile Ave NE between NE 2r� &3rd Streets Site Area: 77,199 SF , - �� - � _ �� _ --��n �� .-��s- , , _ _ f -- - — - -- _ -- - y .� _._� __._,_� _ = a: __�-� —�. � .: . - - s _ , _:� �� _ __. _: , ( _.,-.,.Q,.v._-d:_-_._.:--� _ ,� _ �_:r_ .�:_...: _ .� �-- - -- - - - � __ �_, :.-- _._._: _ _..�_--- _._ _ . � .__. _� �.- �-— - .,..e,�. � M..- _ �„ , - a-�. -,.. � _�.,____ ._,. ..._�_ .�w.- -----r- .,.,��- _ _..�.�...,��,.�,. ,� .r�r, „ .:-,�-.-�.M_--_:- � m. .-,�.,� 'CE.�.�f.+5�.zr .. .�+xT n+�.,^� .. . t . .-. . 2 . 1. .�. ,. ._ .. -. . _ _ . ..�pcw.�wYsw(.�a�"erasTmsN-A � .. � . �,��ar4enFe�x�c -r. . ^-:'..PS-v ....:.-T ..,_.-]S+'2E.si:3S+FP5'.c4Yu�_tr.'_d'.9F`.•.ezi*�+A�Y.+'rm,'......vy'.,3G.M3r.6'C3="^'.-----n• �..__.."; :.,^."'�'�-t'Il"-�.x -._.��T'q'Jt,....�...-a w�...^�'c.. �t..5±�e�'R.�!N� �� pU4i-4&"�'�`+]lleA. 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FXHIBITS: Exhibit 1: Administrative Decision Exhibit 2: Vicinity Map Exhibit 3: Short Plat Plan Exhibit 4: Landscape Plan Exhibit S: Aerial Photo Exhibit 6: Drainage Report Exhibit 7: Wetland Assessment Report Exhibit 8: Geotechnicaf Report Exhibit 9: Public Comment Letter—Hazen Exhibit 10= Public Cornment Letter—Edmands C. GEIVERAL lNFORMATION: 1. Owner(s)of Record: Biake FamilyTrust PO Boxes 2566 Renton,WA 98056 2. Zoning Ctassification: Residential-4 du/ac(R-4} 3. Comprehensive Plan Land Us.e Designation: Residential Low Qensity(RLD) 4. Existing Si#e Use: Singfe Famify Residential 5. Neighborhood Characteristics: a. North: Single Famrly Residentia!{R-4 zaneJ b. East: Vocant(R-4 zone) c. South- Single Family Residentia!(R-4 zoneJ d. West: Single Famlly Residentiol(R-4 zone) 6. Access: Via 45-foot wide public road extended from Nile Ave NE terminating in a hammerhead turn-around 7. Site Area: 77,199 SF(1.77 acres} D. HISTORICAL/BACKGROUIItD: Action Land Use File No. Ordinance No. Date Comprehensive Plan N/A 4924 11/01/2004 Zoning N/A 5099 11/01/2004 Annexation N/A 4760 04/21/1998 Short plat Report City of Renton Departmerri of Community& Ecanom,ic Development Adminrstrative Short Plat Report& Decistan RENTON 7 SNORT PLAT LUA13-D01214,SHPC-R Report of November 20,2013 Page 3 of 12 F. PUSLIC SERVICES: 1. Uti[ities a. Water: This site is located within Water District 90. b. Sewer: Sewer service will be provided by the City of Renton. There is an existing 8-incF� diameter sewer pipe in Nile Ave Ne. c. Surface/Storm Water. There are storm drainage impro�ements in Nile Ave NE. 2. Streets:There are no street improvements in Nile Ave NE. 3. Fire Protection:City of Renton�ire Departmen# i� � , F APPUCAB.i.E SECTIONS OF THE RENTON MUNIClPAL CODF: 1. Chapter 2 Land Use Districts a. Section 4-2-020: Purpose and Intent of Zoning Districts b. Section 4-2-070:Zoning Use Table c. Section 4-2-110: Residential Develapment Standards 2. Chapter 4 Property Development Standards a. SectEon 4-4-030: Development Guidelines and Regulations 3. Chapter 6 Streets and Utility Standards a. Section 4-6-060: Street Standards 1 4. Chapter 7 Subdivision Regulations a. Section 4-7-070: Detailed Procedures for Short Subdivisions b. Section 4-7-120: Compatibility with Existing Land Use and Pfan—General Requirements and Minimum Standards c. Sectian 4-�'-150:Streets—General Requirements and Minimum Standards d. Sectian 4-7-170: Residentiaf Lots—General Requirements and Minimum Standards 5. Chapter 9 Procedures and Re�iew Criteria 6. Chapter 11 Definitions G. APPLICABLE SFCTlONS dF 7'HE COMPRE'HFNSIVE PLAN: 1_ Land Use Element N. FINDINGS OF FACT: 1. The applicant is requesting an Administrative Short Plat in order to subdivide a 77,199 square foot site _ into seven single family lots and a tract for drainage. The proposal would resuft in a density of 4.4� d u/ac. �. i he s�bie�t site i� locate�i an Ehe we�:side of Nile Ave �VE just r:ort�of N� 2'"St, 3. The property is Eocated within the Residential Low DensFty (RLD} Comprehensive Plan land use designation and the Resit�ential 4(R-4) zoning classification_ 4. The site is currently vacant. II `" Short p1u2 Report Gty of Renton Department of Community&Ecanomic Developriment Administrative Short PIQt Report&Decision RENTON 7 SHORT PLAT LtlA13-001214,SHP[-A , Report of November 20,2013 � Page 4 of iZ �' 5. The proposed subdivision would result in seven lots each with a lot size ranging fram 8,Od2 to 9,030 square feet with an average lot size of approxirnately 8,4130 sq�are feet. 6. The following table are proposed d'+mensions for Lots 1-7: As Proposed Cot Size Width Depth Lot 1 8,431 SF 80 feet 160 feet - tot 2 8,002 SF 75 feet 160 feet tot 3 8,002 SF 75 feet 16D feet � Lot 4 9,030 SF 70 feet 128 feet Lot 5 S,9b0 SF 74 feet 206 feet Lot 6 8,028 SF 76 feet 106 feet Lot 7 8,3SS SF 80 feet 106 feet 7. Access to the lots is proposed via a 45-foot wide public road extended from Nile Ave NE terminating in a hammer-head turnaround. 8. Tapographically,the site is reiativefy flat with a four-foot change in eievation. 9. A geotechnical report was submitted with the short plat app[ication, prepared by Robert M. Pride, LLC (Exhibi# 8). The existing soils an the site are mapped as be;ng Alderwood gravelly sandy laam. AgC— Alderwood Gravelly Sandy Loam. �0. A landscape plan was subrr►itted with the application and includes the installatian of street trees within the rignt-of way anci fivo trees per lat in tne rront yard and one tree per fot in t�e rear yard {Exhibit 4). 11. A tree inventory indicates a total of 104 trees on the site, of which 10 trees are proposed to rernain foliowing development. The site is daminated by big-leaf maple, western red cedar, and red alder. There is an occasional Douglas-fir and blacic cottonwood. 12. A drainage plan and drainage report has been submitted with the short plat application (Exhibit 5).The repor� a�.�esses �orr��iance �ntith 2DC9 King County Sur�ace b1,'oter PJId('iUal �iCCSW�) anti Ciiy of - Renton Amendments to the KCSWM, Chapters 1 and 2. Based on the City's flow contra! map, this site falfs within the Flow Con#ro! Duration Standard, Forested Conditions. ].3. A wetland assessment report was submitted with the project application, prepared by Chad Armour, LLC, dated O�tober 28, 2013 {fxh��it ??. The repert states there is no ;n�ication af wetlands an the subject site. 14. There are no other critical areas located on site. 15. Except whe� laeated cn lan�s �r�vere� �y rnrnter; sh�rt ,r.,��ts are ex�rrr� ��-nm SFPA EC1VIf01�lZ"iPtlt•3I Rev�ew�Ursuant te wac 1��-1�-soo{6a(a). 26. The Planning �ivision of the City of Renton accepted the a�ove master app[ication far r2Vt�W on Sectem�er 6; 2J13 an� u'ztermired i� comalete on Se�tzm;�� 12; 2013. TF� c�rt�j�ci: ��v�., �;acer_i r�n hoid on dctober 7, Z013 and tak?n off halci on �ctober 31, Zo13. Th� project comp(ies tuith the 120- day review period. �-J. St�'i'F f2i,EiVc� uLiuilC COi'i'1i71efif5 f��m �,vo �art.ies �if rrt.3�i� �Fk�"klI_11�5 � af1�� ll�;. rOT1iCllP�i�S fl7fi{i!{Q('� � request fiar staff to require an evergreen buffer to be placed bet�veer� the hammer�ead turn-around and the ab�tting property to the west. The second Ietter raised concerns with regard to the hydro(ogy of the site and possible presence of wetlands. 1$. rZepresentatives from various city depastments have reviewect the appiicatic�n ma#eriass ta itientify and u'ua`�ii��SS 9SSU�S iui$�u uy t�Si. Nr`J�vScu C2V2I4j3i"fi2i�t. eiicSc �vii��i�ci,i� a'iFc' i.viiiaiirct�.t i(i�Ii2 Gi�iCia{ ��c� S�I U!['xll'CI��(E�7Uf C � City of Renton Department of Community& Economic Development Administrative Short Plot Report&Decrsion RENT0t1f 75NORT PLAt LUA13-001214,SHPL-A Report of November 20,2013 Page 5 of 22 and the essence of the comments has been incorporated into the appropriate sections of this report and the �epartmental Recommenda#ion at the end of this report. 19. The proposal requires Administrative Short Piat Review_ The fallowing table contains project elements intended to comply with Short Plat decision criteria,as outlined in RMC 4-7-070: , SHORT PLAT REVIEW CRITERIA: ' 3. CQNFORMANCE W{TH THE COMPREHENS[VE PLAN: The sit� is designated Residential Law �ensity(RLD� an the Comprehensive Plan Land Use Map. Lands in the , RLD designation are intended to guide deve(opment on land appropriate for a range of lo�v intensity I residential where land is either constrained by s�nsitive areas ar where the City has the opportunity to add larger-1ot ho:�sing stocic, at ur�an densities of 4 du/net acre, to its inventory. The proposal is consistent with the following Comprehensive Plan Land Use and Community Design Element polic�es if a►! condit�ons of approva► are complied•a�ith: � Fotiey LU-243. Within the Resldent�al 4 du/aere zaned area ailow c� rnaximum density of 4 � units per ne� acre *o ��couroge iorger !ot development and increase the sup;aiy e; upper income housing consistent with the City's Housing Element. Poticy LlJ-148. Interpret development standards to support provisiora of landscane features as�.��Jl as inr.�vative site plannrng. Crit?ria should irtcf!rde: � �) Attra�t,•'ve resid�ntra!stree�sccp�s with lan�sccped Jrani ytrr�'s t�`�at crE vrsibte frvm the street; � � 2} Lanr/scaping,�referably with dreught-resistant plant materia�'s; 3J Lcrrge cali�er st;eet trees; 4J lrrigate�landstope planting strips; SJ Low-impact developmer.t using l�ndscaped buf,fprs, open spaces, and ather �ervious surfaces for surface wat�r runoff�a�-�d Signi�icant naiive tree and vegetation retention ond/or repfacemer.i.. Policy LU-152. Single family/ot size, lor width, setbacks, ond rmperviaus su�ace sh,aufd be ✓ suffcient to aliow private open space, landscaprng to provide buffers/privacy without � extensive fencing,and suffir_ient area for maintenance attivitres. Objective CD-C. Promote reinvestment in and upqrade of existinq residential nerghborhoods f through redeve/opment of smat(, underutilized parcels t�vith in�lJ development, n�odifrcation r�nd atteration ef alder housing stock, and improvements to streets and side�valks to�ncrease properfy vo/ues. Policy CD-12. TnfilJ deveiopment, defined as new short plats of nine.or fewer Iots, shauld be •� encouraged in arder to add variety, updated housiriy stock, and new vitality to neighborhoods. Poficy CD-13. Infi(1 de�elapment shol�(d be ref.�ec*rve�f the existing rharactPr of est�blished nefg!hborhoods even w�►en ��s��ned using �iffe,ent architectural styles, an�Jor respcnding +< to rrrore urban setbacks, heignt or tot requirements. tnfrll development should dr�w on etements of exrsting develo�ment such as p/crcement of structures, vegetatron, and location , of entries and walkwcys,to reflect the site plarrning and scale of existfng preas. 2. CONlPLIANGE WtTH THE IiN�EKLYING ZONING CL45SIFICA�[014: Ti�e su�jed site is �lassifie� liesidential-4 du/ac {R-4) on the City c€ Rentc� Zoning Ma�. �tMC �-2-1ZOA �ravides developrnent startdaras far cievelo�ment w:thin the R-4 zoning ciassification, i ne proposaE is censstent wi#h the following deve(opr^ent starcdards i#a[I candit?ons af appraval are cornp!i�d�ith: Dertsi�y:The maximurn det�sity per�n€tted isi il�e R-4 zane is 4.0 dweiling ur�its per net acre. Net�ensity is ca[culated after the dedu�tian of criticai areas, areas intended for put�lic righ�- Y af-way,and private aceess easements_ Staff Ccmrne�t: The a�piicart wa;�E� ue re.�uired to dE�icat2 a 7,9�5 sr�ua�C #oot arza �or �� ,�r��-^:�ew��t Gty of Renton Department of Community&Fconorr�ic Development Administrative Si�ort Plat Report&Decision RENTON 7 SNORT PLAT LllA13-U01214,SHPL-A Report of November 20,2013 Page 6 of 12 right-of-way dedicatians aEong Nile Ave IVE. As a result the net square faotage of the site would be 69,253 square feet (1.59 net acres). The seven lot proposal would arrive at a net density of 4.40 dweifing units per acre (7 lots/ 1_59 acres=4.40 du/ac) and when using the rounding provisions of the code fafls within the permitted density range for the K-4 zone. ' Lat Dimensions: The minimum lot size permitfed in ti�e R-4 is S,D00 sqUare feet. A minimum lot width of 70 feet far inrerior lots and 80 feet far corner lots, as wetl as a minrmum lot � depth af 80 feet, rs also required. Insofar as practicol,side!ot lines shalt be at right Qngfes to street Iines or radial to curved street lines. Staff Corrtment: As demonstrated in the table above, al( lots meet the requirements for minimum fot size,depth,and width. , Setbacks: The requrred setbacks in the R-4 zone are os follows:front yard is 30 feet for the primary structure; interior side ya:d is 5 feet; side yard along � street is 2t?feet for the ✓ primary structure;ond the reor yard is 25 feer. Staff Comment: Compliance with building setback requirements would be reviewed at #h? time of building permit review. ' Building Standards:Burlding height is restricted to 30 feet and 2-stories. Detached accessory � structures must remain belaw a height of 15 feet and one-story. The allowed building !ot ' � coverage for lors over S,�OQ Sf in size in the R-8 zone is 35 percent or 2,500 SF, whichever is , greater. The aUo�ved impervious surface coverage is 75 percent. Staff Comment: The building standards for the propased lots would be �erified at the time I of building permit review. , Landscaping: Ten feet of on-site landscaping is required a;ong a11 pubtie street frontages, ' wit�h the exceptton of areas for required walkways and drivewoys. S#aff Comment: A conceptual landscape plan was submitted with the project application i (Exhibit 3). The landscape plan includes a planting plan, the propased tree species (argeEy I consis�of Jacquemnnti� Birch, Autu►nn maple, flov+rering pear, katsura and vine maple. The � landscaping plan did �ot include a 10-foot wide landscape strip along Nile Ave NE or the proposed internal street_ Additionally, it is unclear if the applicant's landscape plan is comp[iant with the tree replacement requirements af the code{see befow). Staff recommen�'s, as a candition of appro�al, the applicant submit a revised and detailed � landscape pian including the tollowing: a 10-foat on-site landscape str�p aEong the frontage of the site ��di1e Ave NE} and the proposed internai street; a mixture of trees, shrubs, and grounticover;and compliance ivith the tree replacement reGuirement pe�RMC 4-4-130. The revised landscape plan,shal) f�e subFnitted to, anti approved by,the Current P�anning Project Manager prior to construetion permit issuance. StafF received public camments c�ntaini�g a request to reguire an evergreen buffer at �he termination of the prapased hammerhead tr�rn-areund from the abutting sing{e family residential development (Exhibit 91. However the proposed hammerhead cioes not extend to the western property line. The propased �rainage pond, �vhich does abut the western property Iine, wou{d be required to be fenced and would provid� a buffer between the tur�ara�.�nd and the abuiting property to the west_ Parkirsg: E��h unrt is requrrzd to acca�^fmodate of�street parkir,g fcr a mirtirrtum af t�vo f vehicfes. ;' Staff Comment: Sufficient area exist, on each lot, to accommadate off street parking far a mini�um of two�ehic[es. 3,D�Sl�t�l 5TAlVDARDS: RfviC 4-2-125 provides residential and open spa�e standar�s Tor devei��ament withsn ±he �-��oning classifcation.The proposa!is�onsistent a�:'sth th�foll�tt�ir:g c�nsign stan�ar�s if a!!conditior;s of approvai are compEied with: NJA !ot Confguration:4r�e of the Following is required: City of Renton Departmerrt of Community&Economic Development Administrotive Short Plat Report&Decisron � RENTaN T SHORT P!A?' LUA13-0O.I214,SHPL-A � ' Report of November 20,2013 Page 7 of 12 � ` Lot widtir variation af 10 feet minimum of one per four abutting street fronting lots, or Minimum of four lot sizes(minimum of 400 gross square feet size difference), or , A front yard setback variation of at leost frve feet minimum for at Jeast every four abutting ' , sireet fronting lots. 4.CRITtCAI AREAS:The proposal is consistent with critical area regulations as stated in RMC 4-3-150: Staff received public comments raising hydrology concerns far the site and the potential for " � a wetland to be locatecf on the site{Exhibit 10). A wetland assessment report was submitted with the project appficatiort, prepared by Chad Armour, LLC,dated October 18, 2013. The report states there is no indication of wetlands on the subject site (Exhibit 7}. 5.COMMUPIiTY ASSETS:The proposaf is consistent with the following community asse#requirements: Tree Reterrtian: RMC 4-�-330 required thirty percent of the trees th.al! be reta�ned in a residential development. , Sta�Commer�t:There are a total of 10�trees locate�!on sitz cf which �Q are praposed to be retained. The applicant is requ�red to retain 30 percent oF the trees located on site that are not located within critical areas, proposed rigE�ts-af-way and access easements. The applicant indicates 44 trees on site would be exduded from the tree retenti�n calculations due ta their locatian in proposed right-of-way, utility, and access easement corridors. However, utility corridors are not excludPd fror�the tree retention calculatiors. Therefare, �� it is unclear the number of trees required to be retaine�. Staff recarrimends the applicart Gorr�pl�ant submit a revised tree retentian worksheet and tree retention p(an reflecting the exclusion of trees witF�in proposed right-of-vsray and access easements only for the purposes of calculating the number of irees ta be retained. The revised tree retention pfan and worksheet shall be submitted�o the Current Planning Project Manager prior to construction perrnit appraval. As a note to the app6car�t �a�hen the required number of protected trees car�nc,t be retained, new trees, w�th a two-inch caliper ar gr�atzr, shali be planted. The replacer�ent rate shaii be 12-cafiper inches of new trees to replace each protected tree removed. 6. COMPLIAt�CE WITH SUBQIVlSION RE6tJLAT10NSc RMC 4-7 Provides review cr•iteria far the subdivisions. Th� proposa! is consister.t wrth ±h� fallewing subdi��sion regulatians if alf conditions of approval are com�lied wi�h: Access: Each lot must.have access to a pubGc street or road.Access may b?by private�rccess easement street per the requirements of the street st�rndards. Additionally, RMC 4-4-080L7 � Parking, Loading, and f3rrveuray Regulations states that Joint use driveways should be encoclraged cvhera feasible and anpropriate. Partiatiy Staff C�mme�t: !t is feasibl� and appropriate for Lots 3 ard 4 to gain access via a jaint use Compliar�t ��veway. A j�ir�t use drivEway wou{d reduce the number cf curb cuts along interr�af road and �hereby imprave safety. i herefare, staff recommends as a conciitior� of approvai ihe applicant be requir2d to provide a joint use driveway far Lats 3 and 4. The joint use �rivewav shall be treated upon the comman propertyr line of Lots 3 and 4 and sha{I be � assured by easement. Th� accsss easement shall be recorded pricr to or concLrrent�y with the recording of the shcrt p!at. IV jA Blocks:8tocks shalf be riee�enougn to alfaw two tieis ol lots. Streets: Th� proposed street system shall extend ant! cr�ate connections berween existing streets per the Street Standards outlined in RMC 4-6-06G Street Standards. � Staff Cornmeni: Niie A�e NE is cEassifiea as a r�.esit�entiaf Access street and current[y nas an auailab(e right-cf-way width of 6Q feet, which exceeds the City code requirement of 53 feet. i-er RN1C 4-b-06d resicfential stree#s include a 26 feet wide paved road 5urface,0_S-foot wide , curbs and eutter, 8 feet�ide planrpr and 5-foot wi�e sidew�fks on both sides of the street. Shor-t�lat Repori Crty of Renton Department of Community&Fconomic Development Admrnistrative Short Plot Report& Decision RENTON 7 SHORT PLAT LUA13-00121a,SNPL-A Report of November 20,2013 Page 8 of 12 Tk�e available paved width on Ni1e Ave NE is 32 feet. The curb is praposed ta be located at the edge of the existing pavement edge,followed by the planter and the sEdewalk. The applican# has praposed a Limited Access Resfdential public street with right-af-way width af 47 feet to serve the internal lots. The applicant has included a paved width of 20 feet,with a 0.5-foot wide curb and gutter,8 foot-wide landscaped planters and 5-foot wide � sidewalks on both sides of the proposed internal street. The proposed right-of-way width " and street efements comply with the street code requirements_ I ' The proposed short plat is also anticipated to generate additional traffic on the City's street system. The applicant wauld be required to pay an appropriate Transportation impact Fee. The fee, as determined hy the Renton Municipal Code at the time of payment, sha�l be payable to the City prior to building permit issuance. Currently this fee is assessed at 717.75 er new sin le famil home. However the fee will increase to 1430J2 on , $ $ P g Y , , January 1,2014. 7.AVAILABfLITY AND IMPACT ON Pl7BUC SERVICES: Police and Fire: Sufficient resources exist to furnish services to the proposed development; subject to the condition that the applicant provides Code required improvements and fees. The applicant would be required to pay an appropriate Fire Impact Fee. The fee, as �/ determined by the Renton I�unicipal Code at the time of payment, shafl be payable to the - ' City at the time af building permit issuance. Currently this fee is assessed at $488.Q0 per , each single family lot. �n January 1, 2014 the fee will decrease to $479.28 per each new ,- � single family(ot. � Schoo[s: It is anticipated that the Renton School District car accommodate any additiona! _ students generated by this propasal at the following schools: Maplewood Elementary, _. i � McKnight Middle School and Hazen High Schaol. A School Impact Fee, based on new singfe- �i family lot, will be required in order to mitigate the proposal's patentia! impacts to Renton School District. The fee is payable to the City as specified by the ftentan Municipa) Code at the time of building permit issuance_ Currently the fee is assessed at�6,395A0. Starm Water: ,4 drainage report, prepared by Offe Ergineers, was submEtted for the proposed project (E�chibit 6). The drainage report camplies with the 2009 King County Surface Water Manual and City Am�ndments. Base�i on the City's flaw contro! map,this site fa{[s within the F1ow Control Duration Standard (Forested Conditions). The applicant is � proposing flow control by means of a storm water pond facility and water quality within the Storm Water 7ract. Drainage p[ans and a final drainage report based on the City adopted 2009 Surface Water Design Manual Amendment and the 2009 King County Surface Water Drainage is required to be submitted with the construction perrnit. The fina! drainage report mt�st indude infarmation of all the core requirements and the special requirements, especially the requirements for�fow control,water qua(ity, and starmwater BMPs. f Water and Sanitary Sewer:A water availability certificate is required from Water Qistrict 94. An "approved" set af water plans from Water District 90 will be required to be submitted with the civil qlans_ There is an existing 8-inch diameter sewer pipe or� NiEe Ave NE. An 8-inch diameter sewer main is proposed to be e�ctended into the site. The individual lots are tc be served by individ�al side sewers. A man hoEe is propcsed at the intersection of the sewer main exteresion witF�the existingsewer main on Ni[e Ave NE. A second manhale is proposed ia be lecated tvithin the site and would be required to be located at the terminatian of the propos�d publie street. This proposai is also locatec! in the Central Plateau Special Assessment District. These fees are currently $431.21 per conr�ection and s�all be paid at � r"„-,.-`__i,..�n-:._,..r- .-uc:t i f..iiiit;.cj.+v:t ---�------ -------- _ ___._.i City of Renton Deportment of Communiry&Economic Development �dministrative Short P/at Report& Decision RFNTON 7 SHORT PLAT LUA23-001214,SHAL-A Repart of November 26,2013 Page 9 of 12 the time a construction permit is issued, prior to recording the short plat. l. CONCtUS10N5: 1. 7he proposal complies with the Short Plat Criteria if all conditions of approval are met and madificatian ' for approval. 2. The proposal is compliant and consistent with the plans, policies, regulations and appravals. 3. Staff does not anticipate any adverse impacts on surrounding properties and uses as long as the conditions of approva! are complied with. ; 4. The proposed use is anticipated to be compatible with existing a�d future surrounding uses as permitted in the R-4 zoning classification. 5. Safe and efficient access and circulation has been provided for al1 users. 6. There are adequate public services and facilities to accommodate the proposed use. 1. DE�lSION: The Renton 7 Short Plat, File No. LUA13-001214,SHPL-A, is approved and subject to the following conditions: 1. The applicant shal! submit a revised and detailed landscape pfan including the following: a 10-foot on- site landscape strip along the frontage of the site (Nile Ave NEj and the proposed internal street; a mixture of trees, shrubs, and groundcover; and compiiance with the tree replacement requirement per � RMC 4-4-130. The revised landscape plan, shali be submitted to, and approved by, the Current Planning Pro�ect Manager prior to construction permit issuance. 2. The applicant shall submit a revised tree retention worksheet and tree retention plan reflecting the � exclusion of trees within proposed right-o#-way and access easements only for the purposes of ' calculating the number of trees ta be retained. The revised tree retention pian and worksheet shall be submitted to the Current Planning Project Manager prior to construction permit approvaL 3. The applicant shall be required to record an access easement for the benefit of Lots 4 and 5. The access II easement shall be recorded prior to,or concurrent with,the recording of the short pfat_ DATE OF QECISION ON LAAlD USE ACTION: SlGf�1ATURE: R '1 -- �. � f ---_ � Z C.E "ChipN Vincent, Administrator a e ' Departrnent of Community&Economic Development Short plat Report , City of Renton Department of Commurrity& Economic Development Administrotive Short Plat Report&Decrsion RENTON 7 SNORT PLAT lt1A13-001214,SHPL-A Re�ort of November 20, 2013 Page 10 of 12 TRANSMITTED this 20"'day of November,2013 to the Contact/Applicont/Dwner(s): Owner. Applicant: Confact: BJake Family Trust Joy Marc fiomes Darrel!Offe PO Boxes 2566 7683 SE27th,Suite t#487 Offe Engineen,PLLC Renton, WA 38056 Mercer lsJand, WA 98040 13932 SE 159th Place Renton, WA 98058 TRANSMITTED this 20�'day of Novem6er,2013 to the Party(ies)of Record: None TRANSMlTTED this 2Q`h day of Novem6er,2013 to the following: Neit Watts, Development Servrces Director Abdoul Gafour, Development Services Jan Conklin, Development Services Carrie Olson, Development Services Jennifer Henning, Current Planning Fire Marsho! Renton Reporter L LAND USE ACT101V APPEALS,REQUEST F�R RECONSlDERATION, & EXPIRATION: ' The administrative land use decision will become final if the decision is not appeafed within 14 days of the decision date. APPEAL:This administrative land use decision will become final if not appeafed in writing to the Hearing Examiner on or before 5:00 PM on December 3,2013, An appeal of the decision(s) must be filed within the 14day appeal period (RCW 43.21.C.075(3);WAC 197-11-680). Renton Municipal Code Section 4-8-110.B governs appeals to the Hearing Examiner. Appeals must be filed in writing together with the required fee to the Hearing Examiner, City of Renton, 1055 South Grady Way, Renton,WA 98057. Additiona!information regarding the appeal process may be obtained from the City Ckerk's Office, Renton City Hall-7th Floor, {425) 430-6510. 'I EXPfRATION:The administrative short plat decision wilE expire two(2)years fro►n the date of decision.A single I� one(1)year extension may be requested pursuant to RMC 4-7-070.M. ' RECONSIDERATI�N:Within 14 days of the decision date, any party may request that the decision be reopened by the approval body.The approvai body may modify his decision if material evidence not readily discoverable prior to the origina[decision is found or if he finds there was misrepresentatian of fact.After review of the reconsideration request,if the appra�al bodyfinds sufficient evidence to amend the original decision,there will be no further exiension of the appeal periad.Any person wishing to take further action must file a formaf appeal within the 14-day appeal time frame. THE APPEARANCE OF FAIRNESS DOCTRINE:provides that no ex parte {private one-on-one)communications may occur concerning the land use decision. The Doctrine applies not only to the initial decision, but to Appeals to the Nearing Examiner as well. All communications after the decision/approval date must be made in writing through the Hearing Examiner. Afl communications are public record and this permits all interested parties to know the contents of the communication and wouid allow them to openly rebut the evidence in writing. Any violation of this dortrine could result in the invalidation of the appeal by the Court. Short plat Report ' Crty of Renton Department of Community&Economic Development Administrutive Short Plat Report& Decisron RENTON 7 SHORT PLA T 1UA13-QOIZI4,SHPL-A Report of November 20,2013 Page 11 of 12 ADVtSORY N�TES TO APPLlCANT The following notes are supp[emental information provided in conjunc#ion with the administrative land use actiort. 8ecause rhese notes are provided as informatron only, they are not su6ject to the oppeai process for the land use actions. PEANNII�G 1. RMC section 4-4-030.G2 limits haul hours between 8_30 a_m_to 330 p_m., Monday through Friday unless otherwise . approved by the DevelopmenE Services Division. 2. The applicani will be required to camply with protection measures for retained trees as set forth in RMC 4-4-130H8 during construction. � � FERE � 1. The fire flow requirement for a single family home is 1,000 gpm minimum for dwellings up to 3,600 square feet _ (including garage and basements}. If the dwelling exceeds 3,600 square feet,a minimum of 1,500 gpm fire flow would be required.A minimum of one fire hydrant is required within 3�0-feet of the proposed buildings and two hydrants if the fire flow goes up to 1,500 gpm. It appears there is adequate fire flow in this area.A minimum of one new hydrant is required. 2. The fire impact fees are appficable at the rate of$479_28 per single famify unit.This fee is paic!prior to recording the plat. . 3_ Fre department apparatus access roadways are required to be a minimum of 2�-fee#wide fully paved,with 25-feet inside and 45 feet outside turning radius. Fire access roadways shall be constructed#o support a 3o-ton vehicle with 322-psi point load[ng.Access is required within 150-feet of all points on the buildings.Approved apparatus tumarounds are required for deacl end roads exceeding 150-feet.Hammerhead turnarounds are allowed for dead end streets up to 300-feet long.Access as proposed appears adequate. WATER - 1. A water avaifability certificate is required from Water Distriet 90. 2. The project will need to provide domestic service and fire service to the proposed development. ` 3. Per the C�ty Fire Marshal,the preliminary fire flaw requirement for a single famiEy home�s 1,000 gpm minimum for dwellings up to 3,600 square feet(induding garage and basements). If the dwelling exceeds 3,600 square feet,a minimum o#1,500 gpm fire flow would be required. A minimum of one fire hydrant is required within 300 feet of the proposed buildings,and two hydrants if the fire flow goes up to 1,500 gpm. Lateral spacing of fire hydrants is predicated on hydrants being located at stree#in#ersections{also capabfe of delivering a minimum of 1,Qd0 gpm)within 300 feet of the structure. This distance is rneasured along the travel route. SANITARY SEWER ' 1. The sanitary sewer project needs to be finaled prior to the short plat recording. 2_ System development charges(SDC)fee for sewer is based on the size of the new domestic water to serve the new home on each Iot. The wrrent sewer fee for a'/.-inch or 1-inch meter install is$1,812.00. 3. The Centra!Plateau Intercep#or Special Assessrnent District fee is applicable. The fee establisFied in 2009 is$351.95 plus interest per single family lot(as of 11:D8.2013,the rate is$431_Zl per single family house plus daify interest of �� $0.0511�. SURFACE WATER _ 1. The project is required to compEy with the City af Renton Amendments to the 2009 King County Surface Water Design , PVlanual. ' 2. 7he app[icant shalf submit engineered plans and report prior to recording the short plat,and install facilities as to how '' the raof runoff from the new lots will be handled 3. The Surface Water SDC fees are$1,120 per lot. These fees are collected at the time a construction permit is issued. TRA�tSPORTATION/STREET 1. The developer rnust pro�ide the necessary NO PARKING signage. The pavemeni width must meet with Fire � department approval and corresponding right of way widih is to be pro�ided. The pavement thickness shall be a minimum o#4 inches of asphalt over 5 inches of crushed rock. 2. The tumaround must meet with the requiremen#s of sedion H of tlie RMC 4-6-060 and must meet with Fire �epartmeni approval_ Fire department requires a minimurn 20 feet pa�ed width for hammerhead turnaround. Short plat Report _ ------------- --... . _ __ _. . mi e�o ment Administrptive Short Pfat Re ort&Decision I' City of Renton Departmenf of Communrty&Econo t Dev p p RENTON 7 SHORT PL4T LUA13-001214,SHPL-A �� Report of November 20, 2013 Page 12 af 12 3. TF�e minimum distance between a driveway and a property Eine is 5 feet. 4. Traffic safety guidelines indude a minimum distance of 20 feet between driveways(to avoid potential traffic turning tnovement conflicts). 1#the appEicant wants to provide the driveways to Lot 4 and Lot S in the proposed manner,then no fence,or vegetation will be allowed between Lot 4 and Lot S that will block the view of vehicle movement from ! , the driveway of both Lot 4 and Lot 5. I 5. All new eEectrical,phone,and cable services and lines must be undergrounded. The construction oithese franchise utilities must be inspected and approved by a City of Renton public works inspector prior to recording the plat. 6. The Transportation Impact Fee wi[I be assessed. 7. Paving and trench restoration will comply with the City's Trench Restoratian and Overlay Requirements. GENERAL COMMENTS 1. Separate permits and fees for storm conrtection will be required. PROPERTY SERVICES CONEMENTS 1. See Exhibit 4 for commentr from Property Services regarding information needed for final short plat approval. S�hort plat Report E7- 11 T23N RSE W 1/2 R � '1 R� E _,— s�-R-4-�� s R-0 i � li� -- � -:$p-- • � 6��^ . - � �Frns F � - � . ..�5�.___-_.___.I----"_ . 9E tilh5l �� BE uero sl ' < i ' ' - ' ! ' _ -� ___� /�T_�_.._._,_,_-r- :�� I _ t�� a i i ' i ! i ; i �-"=..� : � i � -1 � ..R-A�- i — i I 3 t - � __ lrON I __'_ __�'! : { __i---�_� � j- f- - -__ . N � �� f._... - I'�-------J � N 3vR � � t_ . 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[ ' _.� �....� l ....- .� � ___.... __ ____ ..._ _. _ i�J -_�i;��<,�M�d;,"��sOG=� - '' �', .��r ,I � -- __,...,.�Q., _. .__�. -- -- - _ , _.«� . � - -- �� , .. - . . « __ ---- - --------- -- --- _ ----- -- ---- -� , ��v±o� - '��gend _ � None City and Cour�ty Boundary s" on,er ('�� a�'d Fze�� Addresses , (� Parcels �:z;�so EXHIBIT 5 182 0 91 1 g2 Feet JYGS_1984_Web_Mercator Au�ciliary_Sphere J��.V i.<� IMonnation Technology-GIS Th�s map is a user generated static ouq�ut fron an Mtemet maPP��9 site and ('1"� � "e' R8TIt0�IME R8f1tOf1w8. is fcr reference orly.Data layers that appear on this map may or may not be P�PPO� 9� accurata,curteni,or ofherwise reliade. �S;}a��$j�'�}�i 9/23/20i 3 THIS MAP IS NOT TO BE USED FOR NAVIGATION � � � Renton 7 Short P1at Nile Avenue SE and SE 2"d Street Renton, Washington 98056 PRELIMINARY DRAINAGE REPORT August 25, 2013 Prepared for: )ayMarc Homes 7683 SE 27�' Street Su ite #487 Mert�er Island,Washington 98040 (206) 390-3800 office ��r�� Q�j ��2G13 C��R��F�f� ��rJNiN �rvl;Jp�� y �. 0 Prepared by: , �j o 3 ��'.� �. . Offe Engineers, PlLC � c � Darrell Offe, P.E. 13932 SE 159"' Place '�+ � Renton,Washington 98058-7832 �g$9� (425) 260-3412 affice `�s�p��,��' f (425) 227-9460 fax � � darre3l.o�e�com�s#.r�et j0 ?, EXHIBIT 6 , �, C E-tAD ARI�iC)11 Ry L�� 65Q0126th Avenue S.E. Bellevue,Washmgton 98005-3941 ' (425)641-9743 chad@chadarmour.com October 18, 2013 Job Number 13-027 Mr. Gary Upper JayMarc Homes 2806 Sunset Blvd. NE, Suite E Renton, Washington 98056 Subject: Wetland Assessment Report �NE 2"d Caurt& Nile Avenue NE (File No. PRE13-000717) Renton,Washington Dear Mr. Upper: ' We are pleased to present the results of our wetland reconnaissance-level assessment for the above-referenced proper#y (site) {ocated in Renton, Washington. SUMMARY OF FINDINGS There are no wetlands on the site. PROJECT UNDERSTANDING We understand that you own the site and plan to construct seven homes on it. We also understand that the City askeci you to conduct a wetland assessment and provide a supplemental narrative regarding groundwater levels and how it may be impacted by development if no wetlands are present. Presumably your engineer will address the potential for groundwater to be impacted by site development. BACKGROUND INFORMATION The site is the location of an undeveloped forest in Section 15, Township 23 Nor�t�, Range 5 East. The site slapes gently to the southwest with elevations ranging from somewhat more than 434 to less than 430 feet above mean sea leve(. The site is bounded by SFRs an two sides, a similar forest to the south, and Nile Avenue NE to tf�� east. The soil map shows that Alderwood gravelly sandy loarr� under(ies the site. Afderwood soiEs are made up of moderately well drained soils underlai� by a dense til( layer typically two to 3.5 feet below the surFace. Alderwood soils formed in glacial deposits under conifer trees. Alderwood soils are not hydric. EXISTING CONDiTIONS We visited the site on October 18, 2013 to assess#he site. There were several t��C�� V �� blazed through the forest, presumably by your surveyor, making access easy. ��T 2 5 20i3 The site is the location of a second-growth forest dominated by big-leaf maple (Ar�„�, �s �,�� macrophyllum}, westem red cedar(Thuja plicata), and red �t-'--"``-�._�-�'�y�``-�-� ~ ' the overstory Eayer. The occasional Douglas-fir(Pseudofsi '1j C:/JobslJayMarc/7LSP/Reconnaissance Report.doc 1 Chad Armour, �� EXHIBIT 7 Robert M. Pride, LLC Consulting Engineer � October 10, 2013 i ; Mr- Gar3'UPPer ; JayMarc Homes P. O. Bog 256b Renton,WA g8o56 Re: ('3evteEhnic.�l R�cam�nendations Proposed Short Piat 2�Nile Avenue NE Renton,Washi.ngton RMP Project No. �3-151-01 ' Dear Mr. Upper, l This report provides additional conciusians regarding discharge of storm water on this new short plat development located west of Nile Avenue and north of NE 2�Street in Renton. It is understood.that the Edmonds who own property at 56i4 NE 2Ila Street just south af this new development have concerns over existing shallow groundwater conditions and the potential for fiiture impacts on their property. The proposed development wall include storm drain trenches for pipe conduits that will lead to Nile Avenue on the east side of the properry. The proposed.storm drain system combined with the trench excavations will collect shallow groundwater and reduce the stirface�va�er and shallow groundwater flows that e�on the Edmonds properky to the south. Please call if there are any questions. '' Respectfizlly, � ��e��7��-� �'_.;,1,- _;, ; �� ,�s . !��:. "°'., :'.�J. '�� , # — �l+r,.;��I - �1 � _ ' ;� ..,r ''I-' •y �. _ ��.. �1 : - ��_:-'-',�}��: � ' n , _. _ l ��-'� i.,fti;�'�:' }.\'t};.1 . ��`. �..�v. -- } .I. �}_ �. '.. � �, _ .� �•- '� �b."-,� ' - ' ti'�, _:_`_` - �Yr'-t:-cS ��(_`�,__'�.'._-�� i Robert M. Pride, P.E. �� Principal Geotechnical Enginee 0 C T 2 5 2 D 13 dist: (�) Addressee EXHIBIT 8 C�TY t�� 0;� F��PdHVL Gt��fSlO�� rmp: JayMarcN�le2 Robert M.Pride,LLC Page 1 13203 Holmes Point Drive NE Kirkland,WA 98034 '} l I In regards to Project: Renton 7 Short PIatJ LUA13-001214,SFiPL-A I - • I We request an evergreen"buffer'to be placed between tf�e west end of the new public road and the existing homes to the west of the Renton 7 Short P[at properry. Also,we request a timeline of the proposed development. Thank you for your consideration, ` �'�� G�``� Paul and Christine Hazen � Q �5�01`� 5527 NE 2"d Ct �� ,��[J�� Renton,WA 98059 G�'(�P�NGQN��U � PL cphazenCa�comcast.net 425 235-1799 EXHIBIT 9 I! , r .� Ryan and Enna Edmonds 5614 l�tE 2'�� St. : Renton, WA 98059 ,�� ; 425-226-4920 �� - . _ . . . ,_ � , . SEP 2 3�Q13 . , . , :: .. � Septeamber 21,2013.. _ . . _ , .... t3 �fl . . , ; ... . - ._ :_ � � � -- . _ . . � - �- .:, ;C1°[`1 a� RE�1 0� Rocale Timmons . . . _ . _ �tAN��vG�N� Senior Planner . � � Department of Communfiy&.Economic Development 1055 S_ Grady Way, . . - Renton, WA 98057 � Re:. Renton 7 Short Plad LUA13-QOi214, SHPL-A f Senior Planner Timmons: . I.am writing regarding the proposed 71ot short plat being planned on the north side of my property. I atxi concerned that the city and applicant need to carefully consider the impact of the proposed develo�znent on the ground water and runoff and how it will affect surrounding homes. While installing a fence on the back of my pzoperty this Iast year in the winter I have noticed tha.t the ground water is very near the surface on the north side of my property or the south side of the pl.at pzoposed for deveiopment_ I came across a french dxain on the property li.ne that a previous owner had installed. That drain had standing water only a foot or two dawn during the winter. Additionally;the south side of the proposed plat contains large cot�onwood and cedar trees,both of which are known to Iike wet environments and remove lots of groundwater from the soil. The site across Nile from this p�at is also a dedicated we�land or natural area that was not developed presum.ably due to gz�our�dwater. I think that the city and applicant need to make sure fhey have a good unders�anding of the hytirology of the site particularly near the south side of the property. I would like to better understand,how the proposed short plat would be graded and how the project wou�d affect the ground water that is very near the surface. In general,I think that the proposed plat map seenns reasonable provided the project has no affect on the surrounding groperties. If you have questions please feel free to give me a phone call. ', Thank you for your t7me, �, va mon EXHIBIT 1� _ - Section 3: Offsite Analysis � � The downstream system was walked and driven in October 2013. The site drainage will be collected within ; a storm water pond on-site and discharged into the existing storm system in Nile Avenue NE; City identification #131896. The drainage will continue within conveyance pipes into NE 2`"' Street to the east. The drainage flows through thru a pipe and catch basin network within this project to the east approximately 2650 feet before entering a storm water pond, City #145381. This pond shows no over topping or capacity problems. The pond (145381) discharges at the southwest corner of the property into a recently"mitigated" stream area on the County Park property to the south. The stream continues south through the County park ' property before entering a 36"pipe at the north end of 149"' Place SE. This inlet has a trash rack over it. There appears to be no erosion or capacity problems at the inlet. 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( �.. ,;��, __ _ � � � � � j°=t � l n Ct zta,rA 145539 f�� C�, � � �+' 131�99 131 30ri�32�303 � P*,. ,ws�' � f'� � Iu _. . �^ I'Tpm �16720R{� � G 7 � � � � � �.. 1..226�, 5 37n 584Y��C,�680 87. g921 fi92 9� �0 071 fi 77 02�Bu29 6P36y I I 1�•' � � ,.,_.,. ��j�� .� �i n � 1310 � ' �p ----- � � � ' � � 1 1 4 5633'�r+.i �:-:�..._..._:--� -� �.-_- _..:_-._-...-_.117303 . �,.a560�....117305 I � ��'4 I »� r� . � �� ._.-11726�`' __._. _..._1.1.Z306_116& ��G N � 1 6379. 11.Z300�11Z3�1_ . - --i`rYe30�------ 1417 4�� 3�2- � � I �� 610 G1 ._�_ � E^zfiC�'p�-_,- � I , i ,� � .,,I tWn( z5� _ _ . .. _ .. _.._.11731'5 �1 55 6-- no�- � � � � i�`�e�o��sti �tt�uiz� � Py y�� (z?� �,117302 � i . .� �� . . ��\8384- �, ° .�J � � P� 62i�a �caoa+��, i5a I 1� -�r-� I� �k`,,�..,.1 0, _.�� ,�eq i11�1�407 v�w � I .�..� �' � �♦ ' sa � . I cr�a�i�isiz.ai �szo�9��.. v zsa��a� I..T._.,.... __ �� 1177�57, ' -w � � � 81 8 62 lD � _,,, h� '1 � ;, ., � I i�.:9�i��2es �-�tr»�2es� �n �zvo; iQ __.___ _.� 117950� � , . , ,' t 723�1r- �ms� I _Pf81. .c ��-�;, I . ` 3rio i ��, 117264 M176�I�' 15e�, 8q0� 87 7758_ � � � � � � 1��1�e�zs t aisz xa��ez,� r,'ao2H.� � R�,� �_ , f�`. r .. 117759 �^ I[, .:',111188 I� ' ,I I I ��_� � ��i ��i;i�3a�\ �_...__.. _.....� _ SE 3rd St � � �t , I . � F4SE - 17 T23N R05E SE 1/4 - Pg. 81 � ' � -e, B ` � B4 .B5 B6 B'` Surface Water Utility ! Structurea Culvert(Private) Factltty i s , r � �, c- . ti . � Renton Malntalnad Diameter Renton Malntained 4435 443�p Tg431 �5.3 5433� 5434 544F 5436 � i Type f Catchbaaln or Infel � �_�^-�'�-� Unknuwn � Pond �4-�� G2- Zr3 . �5,� 8.ti 'rC7 �� C�8 • Type 2 Cefchbaein-Menhole '�� 8-24 � Tenk '�t � I '�'�Y � � � � � As s e t I n ve n to ry � � :D AeeeesRleer T�' 25-4e 4$Z "43 1 53061 5805� 5 5.03 ��5 02 'S301 � vault �� D3 1D4 OS D6 • D7� D8 � � Veull � 49-105 Bloawale � � Unknown Pipe(Public) � �4 11 . . 12 \� �7 ..5�' 5309,. 53�10 "5 11 5 1�1 ' Privately Malntatned E1 v)'E2 E3 E4 ''-E5 E6 �87..,,.. .�8 6 M a y 2 013 Privetely Malntalned Diameter � pond \ � '� � ��' / � � ■ Celchbeain or Inlel —► Unknown ��' - . � ' � Type 2 Catchbaein-Manhole �►� 8"-24" i Tank 4F�4 5 1' Sy�17 53�16' S31 ,� 53 4 r , F2 F3 54 F5 6 ,; � :: Acceas Riter �� 25"-48" � Vault 't° � ��I L" � . ' �'.;FIB , I � Vault � 49"+ 323� q324 S t 5320 �5321 531 532 � Bioswele � _ 5324 � (d Unknown Pipe(Private) � . , , 3 4 c5� , :_� . � �� e��",: 0 150 300 600 Rain Gerclen ' �� Unknown Malntenance piameter 26 q 2 „5 0 5329 �53pg" �5327 5326' 325 I ■ Catchbasln or Inlet Unknown Maintalnence --D- Unknown �,,,../ fH� 2 _, _N3. H4^ H H6 H7 H8 u O Catchbasin-Type 2 MH �� B"-24" �=i Pond � ' �_ ,� . . �� Feet � / � ' ._.._,� . �� -� ! Culvert(Public) �� 25��-4e° m Pumpstation 3�`' Ir4'2 5'31 5I�2 33 5 34' `5335,_"533� g � IS 16• 17 18 � Dlameter � 49"+ � RENTON �.�. I .�._ .�.., .I�. �. - �-- --_- Unknown Other Conveyance � PAq 202 4201 'S206. �5 05�' S20',4 520 5202 5201 •g� � -�= e„_2a" ConveyanceType J9� J2 Ji J J5+ J�\ '�j \J ,��c��u� � 8 14 T 2 3 N R 0 5 E N W 1 /4 ' T=' 25"-48" —► Plpe(Unknown Maint) � q9'4 -�-- �itch � Disclaimer: This inventory information is schematic only. � It was compiled from numerous sources. It is the best � information available at this time and should be used ( , - for general guidance oniy. The City of Renton is not , ;r'�,' responsible for errors or omissions. When this information . � •• " `� is used for planning,design,and/or construction purposes; 5314 ( users are to field verify this information. I Pg. 79 1 - - - - - - - - - - - - - - - -� ,�� - �-� I GJIV r�� Jv ��rg. iy - - - - - - - - - - - • - - . , , �� azn�:'-'� / 2�\� se �� 131986✓\ �W�1 9]931_1163 7 ." '' -' _,_ � 116369- - -_ i 15c_c . y�,� �07 84 �" \i 68s IMmr i�t-31,988 �, I�, B'�'t pn.. p�}t -_. � � •` ,... 116371-. �. � __ _ � / O � � y,3 5 �6 'S90i 590�j597 �919dN�2 g0038'009601 i �201 116366---"--- . 111i363 �6 \ i � r'�\C � 1 � i,:�, f�c� zbtl' 11 365" I_. � '�, ,/� u,. ��`sa2 � � �-"��'Y,i�" ___^_ E �_ zoz I 116373 I116372 � I I I T636i ��15829_. _q116,1 I ; ri93a +o', � G� .145381�ce1� �''r >.. 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G4NE - 20 T23N R05E NE 1/4 - Pg. 111 Structures Culve�t(Private) Facility B� BZ E 9� �4 95` B6 �7� g' '` � �" Surface Water Utility Renton Meintained Diameter Renton Malntalned �'I �-" - 4435 443$1 i 5431 �543 5433 � 5434 'S435. ■ Type 1 Catchbasin orinlel �---�_= Unknown � Pond � � . 5436� � C4 �5 1 ! • Type 2 Catehbasln-Menhole �� 8-24 � Tenk `��' � `��-�� +/` ��' B �s s e t I n v � (: Access Riser T�' 25-48 � Vault 4p0`2_�4301 5306 '�5D45 SDS SD63. 5 I�z 53�� e n to r [J] Vault � 49-705 O _� \ . '- . ..�7',� D8 y � Bioswale - � � Unknown Pipe(PubliC) 4 11 ' R j .5308 5309 5310 ' S 1 1 ��I�` Pr lva te l Me ln ta ine d P r i v a t e l y M a i n t a l n e d �4 �z �3 . 5 1 2' I Y Dlameter \ 2 3 E 4, „ES E ' E� E � M a y 2 013 S Celchbasin o�Inlel � Pond �� '"� -� I —► Unknown 'i `- 4 3 1 5 1 8,� 5-1 7 5 3 1 6" � • Type 2 Calchbasfn-Manhole ��• 8"-24" � Tank �F�1 .F� �'F . 4 ...F5 53115' . �q - .. AccessRlsar y� 25"-48" � Vault � Y - � � " �� F ' �,;�'f8 n Vault �r 49'+ � Bioewale 323 43 4 5`19 5320 5321 ,53 532 5824,_, L�i Unknown Pipe(Private) � � " 2 ~ 4 G5 62 � �e c 0 150 3�� 6�� Rein Garden � �_. ��`�� ' Unknown Maintenance Dlameter � - QJ Catchbasln or Inlet -T ��g�aw� Unknown Malntalnence 4 26 4 2 .5 � 5329 53�8 532� 5 26 5325 fF�'I ' & � Pond JZ -_-N . H`4� H5 ' H6 H7 HB @� Catchbesin-Type2MH �-� e"-24" '�� . -I __ � � �'� _ �{� Fe,et CUIVBI't(PUbIiC) �� 25"-4B" � PumpStation 335 Y4f 5�39 � 5�32� 533� � 53�4� `'5335,_ 'S336� 6 Diameter �� qs"+ I � V2 � . 14 15 - 17. � RENTON ��-- ---- unknown Other Conveyante 77p2 4201 ' �' �- � pqq 5206,� �5 05�' S20� 5203 5202 ` 5201 -6 �r 8"_24" ConveyanceType J1�'. J2 � '-JF J�\ 'J e� � 10ft Conlour � 25�._<B�� —� pipe(Unknown MeInQ 1 4 T 2 3 N R 0 5 E S W 1 /4 �t as��. _... , s e -� Ditch Disclaimer: This inventory information is schematic only. It was compiled from numerous sources. 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I 6�'�1 �,�,..:..� sio_ � zoe _ M"'' � � ( �'�� ,,,,.i131941�1�3� �7�7 1i48 4� � 908�� 49�8 18 ..492� 6,QOtl�� ? . �� 14�/i3�. � � � �. . � . � . . . � . �I, ,1 Y( �,;:`F" .c� 1�j� �1 � It:��. �;��,;� , r��. t1s3a�,�� r ,�, r � � f � � �, p ��,r { �� `�� , �, R�� _Y�:: � �� -�- _�_ t�T'� � zte �116030.--�-___��i160�no� __ .---'------ 131932 131933 � � � �11322 � '� � � 149384 � - --r------��1,fi Ba _.__.y � � _ I --- --. ;'1+19'38 -- _ 149383 �11 63 1728 6N q 1�b092 � �1�5�5 V, � I ( aL` .� i�p24 l��1�11i�34 �-id2'�na � I ��t3?�s'6 6 �, 145367� N sa� ao�sstiu ccia�5x�ss�i " ' - � ___--- •_ I 116029-11 7 �� i �'7� i i I � I � �r �S �� r� , �� y��1 C � 0 6�')b Yp 4'u�r� �ml I'. �o � r�� . i ! , . . � . In W3 i'l, y�l� lil � . . ► '�,�� ' ------ .. � . __.__�t� --- _ � � ! � � � � � � I w F `I •�,�o�o� g � �id�r,_ Q' I I ' �� r,t. � I j,o _,�r I r� � a'�' f I Ir' .__�_� i � I�--� ' � v_ �,; so�s:. I ;`* �I', i�,"i� 1 � � �'`.� ��.n4e c� 1 � �'i.� -I � , � �l 1 �, � o� l � LL � `l�� tW:;y :, � ''' , � �� I;::; I ! � � ' F4SE - 17 T23N R05E SE 1/4 - Pg. 78 � R � Structures Culvert(Private) facility '� f B3 84 05 _ gg o(7s ee \u rf a ce Wate r U t i I i ty I Ranton Malntained Diameter Renton Malntalned + I ' � I , I 4435 443�6��T5431• 5 3 5433 k• 5e�e s g �� "5%13_ 436 � ' ■ 'ypo t CatchD�sin or Inlet . -�:�. UnKnown . : Pona &'r�.. ��C�,.C3 q `5��. -T"'7 C8 . • Type2Catchba�ln-Manhols T� 8-24 T��k � �� - Asset I nventor T� �4302��4301 �5306 \�5 53 �� 5 03 � �5301 ' 7: Accui Ris�r 25-48 � yo�� D 3 D4 -D D6 `Sp72 D8 � [O] Vaull � 4B-105 O , : � . ' Blo�wale �� Unknown Plpe(Publlc) 4 11 _, 12 (}7 -5 � 5309,. $3�10 �5 ,, 53,� M a y 2 013 Prlvately Malntained Dlameter Pri�ely Malntalned E1� ',�aE2 S E3 E4, ' - 5 6 B7 �8 6 ' ■ C d c h b a e i n o r I n l e l -� U n k n o w n Pond �� ' 4 4 q 1 _ 5 1' S 17 53�1,6` 5 5,� g Y4 y ' � Typa 2 Calchbasin-Manhole �F B"-24" � T°^k `F1 F2 'K X ;F4 F5, ;5F8 I �� 7• AcceuRlser �� 25"-48" � Vaull f 0 Vaull � 484 � Bioswale 323 4324 5 5320 �5321 53' �53'� 5�24„_ � Unknown PipC(PfivitB) � RalnGartlen '1 �? _ 4 �5-�.��- , � 8 � O �1G0 �]00 GOO IJ J V Unknown Maintanance Diameter 4;26 � Unknown Malntainence 422 :.5 5329 532 � �5327 ' 5326 925 � ■ Camhbasin or Inlet -► Unknown � H� _ . H4 N6��. �;H7 H8 � Pond Feet ' • Gtchbaein-Type2MH �r B"-24" �� --- �� = � ; ��I-- 335-`-�q g 5 31 53�32 5 3 +5 34\ 5335_ Culvah�Public) �� 25"-48" � Pump5lation 1 12.' 13 � 14 5336\ g � Dlametel � 4g^4 �i �� I I • �- 17 18 � RENTON .�_ , . 1 �, . -� � Unknown Othe�Conveyence 1-i P� 202 4201 5 06. 'S-05�� 520.4 520 5202 5za1 �6 I =___= 9"•2�^ ConveyanceType �J ��' +��' J J4 ' ' . �y\ �JB� J 10fi CoNour � � 1 7S 25"-4B" -^► Pipe(UnknownMalnQ � 15 T2�3 N R05 E N E 1 /4 �� 49"+ --��--� Ditch ' Disclaimer: This inventory information is schematic only. It was compited from numerous sources. It is the best information avaiiable at this time and should be used � , � for general guidance only. The City of Renton is not �� , '`�"�`; responsible for errors or omissions. When this information � %.. is used for planning,design,and/or construction purposes, 5315 users are to field verify this information. E � Pg. 76 (. ',.. i (. Section 4: Flow Control and Water Quality Facility Analysis and Design ' FLOW CONTROL REVIEW ; Based upon the City Drainage Manual, the following steps are required to determine the mitigation of storm water runoff of the developed project: ' Full Dispersion — N/G (no good)—the property does not have 100 feet of flow path available on each new lot; Full Infiltration —N/G—the available soils on the property are silty sandy (Alderwood} soils and do ' not provide adequate depth for full infiltration. Limited Infiltration—acceptable—no ground water was found in the test holes below 4 feet, therefore limited infiltration using gravel filled trenches will be utilized to treat up to 600 square feet of developed impervious runoff. The gravel filled trenches will be installed at a depth to bottom of trench of 2'(24'�. The proposal is to mitigate on all the Lots using gravel filled trenches located in the front yards (due to the 30 feet front yard setback for the R-4 zoning) up to 600 square feet of impervious area; to utilize sheet flow of the driveway across the front yards; and to utilize perforated pipe connection at the connection to the storm conveyance system within the front yards. The runoff will be conveyed and collected into a storm water pond. The storm water pond sizing calculations are attached to this section. The detention portion of the pond is sized for 20,653 cubic feet of volume. This is generated from assuming fully developed lots with up to 3,800 square feet of impervious area (average) for the 7 lots. 1,200 square feet of the 3,200 is mitigated on each lot in the form of"Limited Infiltration". WATER QUALITY REVIEW The City Manual requires water quality treatment for projects that add 5,000 square feet or more of"new" pollution generating imperious surfaces (PGIS). The proposed developed (PGIS) exceed this requirement and therefore WQ treatrnent has been sized within the pond. The WQ portion of the pond is required to hold 5,294 cubic feet but is sized for 9,600 cubic feet. This oversizing is due to the requirements of 3 feet of dead storage plus 1 foot of sediment storage. � I i� Yl Z O � H g � U J a U � i Renton 7 Short P/at Existing Conditions: Forested 1.77 acres � I I Deve%ped Conditions: Impervious Pervious ; Lots 0.51 0.83 '� New R/W 0.20 0.09 � Tract A - Pond 0.10 0.04 ' 0.8i 0.96 Renton 7 Short P/at (2) (3) (a) Area Breakdown ** Impervious (1) Mitigated Impervious Un-mitigated Surface Deve%ped Condition LotArea Impervious Surfaces Impervious Runoff Pervious Area Breakdown s , feet s , feet s , feet (sa• feet) , feet s , feet (1>-<Z> 113� +so�io *<zl� <so�io *<zJJ Lots Lot 1 8448 House, walkways, patio 3200 600 2600 2900 300 Driveway 600 600 0 300 300 Landscaping 4648 3200 5248 Lot 2 8003 House, walkways, patio 3200 600 2600 2900 300 Driveway 600 600 0 300 300 Landscaping 4203 3200 4803 Lot 3 8041 House, walkways, patio 3200 600 2600 2900 300 Driveway 600 600 0 300 300 Landscaping 4241 3200 4841 Lot 4 9117 House, walkways, patio 3200 600 2600 2900 300 Driveway 600 600 0 300 300 Landscaping 5317 3200 5917 �2) �3) (4) ** Impervious (I) Mitigated Impervious Un-mitigated Surface LotArea Impervious Surfaces Impervious Runoff Pervious s , feet , fee lsa• fee� <su, feetl (sa• feet) , f t 11>-lz> �13� +so�io *l2J> lso�io *l2)I cots Lot 5 8876 House, walkways, patio 3200 600 2600 2900 300 Driveway 600 600 0 300 300 Landscaping 5076 3200 5676 Lot 8045 House, walkways, patio 3200 600 2600 2900 300 �, Driveway 600 600 0 300 300 !� Landscaping 4245 3200 4845 � Lot 7 8183 '� House, walkways, patio 3200 600 2600 2900 300 ' Driveway 600 600 0 300 300 ' Landscaping 4383 � 3200 4983 i il 22400 Design Impervious(Lots) 0.51 Acres 36313 Design Pervious(Lots) 0.83 Acres **-Lot mitigation inc/udes "limited Infilt�aion"of 600 square feet of roof area(credit 50%impervious runof� and "sheet flow"dispersion of d�iveway(ZO'x 30 J -each/ot. Mitigation of 1,200 square feet per lot �' I ; � i �I I � � � � i> � �� PLACE SH��`T �L_A� I I p� i ' -----_ -.-��'i � I �� I MADISON 34000� I I � ; --- _ � ; p�AN �� , �� . � I I I � i I � ; ' - --.. POND OVERFLOW l� C ___ __ J � \ I I � � � -__ — - - I I i � _ \ i _._ - , . _ � ,' � , �. _ . __ --. . _� �: _ � �-------- � -- - _ - - -_ i.�, -- :��___ _ � i�I I � I � iI � I . I J ; �,;:. :>,�r��f i 10' STORM EASEMENT t I : RIM=434.03 I � � s;,� � � OVERFLOW BYPASS � �; �i ; I IE=425.�i3, 8" (5) LINE I- `,--- �j , --- �t�4--- � � Z �i ; h � `� �-�� '�� \-O.� � �, �0� I �`� i� II � I i � I i � I � � I '�� '.i �. �i� . rn _ _6'_STORM UNE _ _ _ _ _ _ _ _ � +� 1 � • • ' I� Z . � iw • � I � I — — — — — — — WM _ � � �z � - � _ � � � � — � -�-;- � � -' a w� - ,- �I. J ; ; � Z 'll . ' I 6 STORM LINE � ' � � —n- - - - - - � i � • I� � I �p� 5 — _:. - ' �� I 6 '( � �I Lp'( �o I fl� � �, . � i. QpC�� I il i � I !I i � 15' STORM EASEMENT � I j � � � I -- �:r ,, � ———— ——_ _ _______ I CONTROL STRUCTURE _� _ '..._.__ __ �---__ _ _I -� OVEFLOW.BIRD CAGE -- - — -- --_.,�_ -- -- _-_ '' '" I � I � � i il � IVII � � , i � � nei 4ass000w I � SW CORNE�� .�_rta Pi�; � , PA�FOR UCi��r^�,iF � CEDARCROVE P,RK DIVp 0 EL o �24.09' �� ' i I i-rrvv EL ,. a2p.U6. t7.0 I VOL 72.PACE�0 I � ii N1aa•5nu�:��::i I I ��. i . iil �i� III � i II III III I� V M N M � z 0 M�1 � z W H � Existina Site Conditions � Land Use 5ummary n �o�� O '� Area _ J Till Forest 1.77 acres Till Pasture 0.00 acres Till Grass 0.00 acres Outwash Forest 0.00 acres Ouiwash Pasture 0.00 acres Ouiwash Grass 0•OU acres Wetland O.UO acres Impervious 0.00 acres - -- ---- - -Total- - 1.77 acres Scale Facto� : 1.00 Hourly Reduced Time Series: Predev.ts� ?> Compute Time Series I Modiiy User Input � __- - _ ___ __._ _ - _ ' File for computed Time Series [.TSFj I Flow Frequency Analysis Time Series File:predev.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 � 0.112 2 2/09/O1 18:00 0.143 1 100.00 0.990 0.030 7 1/06/02 3:00 0.112 2 25.00 0.960 0.083 4 2/28/03 3:00 0.086 3 10.00 0.900 0.003 8 3/24/09 20:00 0.083 4 5.00 0.800 0.049 6 1/05/OS 8:00 0.072 5 3.00 0.667 0.086 3 1/18/06 21:00 0.099 6 2.00 0.500 0.072 5 11/24/06 4:00 0.030 7 1.30 0.231 0.143 1 1/09/08 9:00 0.003 8 1.10 0.091 ' Computed Peaks 0.132 50.00 0.980 i � �I �. . Developed Site Conditions � Land U�se Summary , �_�° � � � Are a___._._...__ _:_! Till Forest 0.00 acres Till Pasture 0.00 acres Till Grass 0.96 acres Ouiwash Forest' �.00 acres Ouiwash Pasture 0.00 acres Ouiwash Grass O.OU acres Wetland 0.00 acres' Impervious 0.81 acres' - —_ _._._..----_ -Total -______ 1.77 acres -----_ __----- � Scale Factor: 1.00 Hourly Reduced Time Series: Dev.ts� » Compute Time Series �� Modify User Input ` � ---- ___.__._-- -_ ____ _ ____._ ---.__.___ __ __----- _ __ _ File for computed Time Series [.TSFJ Flow Frequency Analysis Time Series File:dev.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- ----Flow Frequency Analysis------- j Flow Rate Rank Time o£ Peak - - Peaks - - Rank Return Prob � (CFS) (CFS) Period 0.282 5 2/09/O1 2:00 0.586 1 100.00 0.990 � 0.217 8 1/OS/02 16:00 0.342 2 25.00 0.960 0.342 2 2/27/03 7:00 0.319 3 10.00 0.900 I 0.220 7 8/26/04 2:00 0.298 4 5.00 �.800 0.268 6 10/28/09 16:00 0.282 5 3.00 0.667 0.298 4 1118/06 1E:00 D.268 6 2.00 0.500 0.319 3 10/26/06 0:00 0.220 7 1.30 0.23"'_ 0.586 1 1/09/OB 6:00 0.217 8 1.10 0.091 Computed Peaks C.505 SO.OG 0.98C Detention Facili Desi n II Facilitv Definition Retention/Detention Facil_ty Type of Facility: Deter.ticr Pond Side Slope: 0.00 H:1�.� Pond Bottom Length: 95.00 ft Pond Bottom width: 62.00 ft Pond Bottom Area: 5890. sq. ft Top Area at 1 ft. FB: 5890. sq. ft 0.135 acres Effective Storage Depth: 3.50 ft Stage 0 Elevation: 100.00 ft Storage Volume: 20615. cu. ft 0.473 ac-f' Riser Head: 3.50 ft Riser Diameter: 12.00 inches Number of orifices: 2 Full Head Pipe Orifice # Height Diameter Discharge Diameter (ft) (in) (CFS) (in) 1 0.00 0.75 0.029 2 2.10 1.SC 0.0?2 9.0 Top Notch Weir: None �utflow Rating Curve: None Staae/Storeae/Discharqe Perfortnance Stage Elevation S�crace Li�cha_ge Fercoiaticr. Scrf Area (ft) (ft) (cu. ft) Iac-ft) (cfs) (cfs) (sq. `t1 , 0.00 100.00 0. 0.000 0.000 0.00 589�. 0.01 100.01 59. 0.001 0.001 0.00 589C. 0.02 100.02 118. 0.003 0.002 0.00 5890. ' 0.03 100.03 177. 0.004 0.003 0.00 589�. 0.09 100.04 236. 0.005 0.003 0.00 589�. 0.05 100.05 295. 0.007 0.0�4 0.00 585C. 0.06 100.06 353. 0.008 0.004 0.00 589�. 0.16 100.16 942. 0.022 0.006 0.00 589C. 0.26 100.26 1531. 0.035 0.008 0.00 5890. 0.36 100.36 2120. 0.049 0.009 0.00 589C. 0.46 100.46 2709. 0.062 0.010 0.00 5890. 0.56 100.56 3298. 0.076 0.011 0.00 589C. 0.66 100.66 3887. 0.069 0.012 0.00 589�. 0.76 100.76 4476. 0.103 0.013 0.00 58SC. 0.86 100.86 5065. 0.116 0.014 0.00 589�. 0.96 100.96 5659. 0.130 0.015 0.00 589C. 1.06 101.06 6243. 0.143 0.016 0.00 589J. 1.16 101.16 6832. 0.157 0.016 0.00 589C. 1.26 101.26 7421. 0.170 0.017 0.00 5850. 1.36 101.36 6010. 0.184 0.018 0.00 589C. 1.46 101.96 8599. 0.197 0.018 0.00 5B��,�. 1.56 101.56 9188. 0.211 0.019 0.00 58'"�' . 1.66 101.66 9777. 0.224 0.020 0.00 5�'� . 1.76 101.76 10366. 0.238 0.020 0.00 58:�:.. 1.86 101.86 10955. 0.252 0.021 0.00 58'=+;:. 1.96 101.96 11544. 0.265 0.021 0.00 585ii. ' 2.�6 102.06 12133_ 0.279 0.022 0.00 5850. 2.10 102.10 12369. 0.289 0.022 0.00 5890. 2.12 102.12 12487. 0.287 0.023 0.00 589G. 2.13 102.13 12546. 0.288 0.024 0.00 5890. 2.15 102.15 12669. 0.291 0.026 0.00 58yC. 2.16 102.16 12722. 0.292 0.030 0.00 5890. 2.18 102.18 12840. 0.295 0.039 0.00 5890. 2.19 102.19 12899. 0.296 0.039 0.00 5890. 2.21 102.21 13017. 0.299 0.043 0.00 5890. _._� 10�.�� 1307E. 0.30C _.��9 0.,. . �8°j=i. 2.32 102.32 13665. 0.314 0.052 0.00 5890. 2.42 102.42 19254. 0.327 0.059 0.00 5890. 2.52 102.52 19843. 0.341 0.069 0.00 5890. • 2.62 102.62 15432. 0.354 0.069 0.00 5890. 2.72 102.72 16021. 0.368 0.073 0.00 5890. 2.82 102.82 16610. 0.381 0.076 0.00 5890. 2.92 102.92 17199. �.395 0.082 0.00 5890. 3.02 103.02 17788. 0.408 0.085 0.00 5690. 3.12 103.12 18377_ 0.422 0.089 0.00 5890. 3.22 103.22 18966. 0.935 0.092 0.00 5890. 3.32 103.32 19555. 0.999 0.095 0.00 5890. 3.42 103.42 20194. 0.462 0.098 0.00 5890. 3.50 103.50 20615. 0.473 0.101 0.00 5890. 3.60 103.60 21204. 0.487 0.412 0.00 5890. 3.70 103.70 21793. 0.500 0.978 0.00 5890. 3.80 103.80 22382. 0.514 1.710 0.00 5890. 3.90 103.90 22971. 0.527 2.500 0.00 5890. 4.00 109.00 23560. 0.591 2.790 0.00 5890. 4.10 109.10 24199. 0.554 3.050 0.00 5890. , 4.20 109.20 24738. 0.568 3.280 0.00 5890. 4.30 109.30 25327. 0.581 3.500 0.00 5890. I� 9.40 109.90 25916. 0.595 3.710 0.00 5890. 4.50 104.50 26505. 0.608 3.910 0.00 5890. 4.60 104.60 27094. 0.622 4.100 0.00 589C. 4.70 109.70 27683. 0.636 4.27Q 0.00 589�. 4.60 109.B0 28272. 0.649 4.450 0.00 5890. 4.90 109.90 28861. 0.663 4.610 0.00 5890. 5.00 105.00 29450. 0.676 4.770 0.00 589C. 5.10 105.10 30039. 0.690 4.920 0.00 589C. 5_20 105.20 30628. 0.703 5.070 0.00 589C. 5.30 105.30 31217. 0.717 5.220 D.00 589C. 5.4� 105.4C 31806. �.?30 5.350 �.p0 5�9�, S.SC -�_.�_ �.'3�+�. �. ,a S.Sr_�C ,.?� 58��. StaqelStoraqe/Discharqe Perfortnance at Siqnificant Storm Events Hyd Inflow Outflow Peak Storage Target Calc Stage Elev (Cu-Ft) (Ac-Ft) 1 0.59 0.14 0.12 3.51 103.51 20653. 0.974 2 0.28 ******* 0.09 3.17 103.17 18654. 0.923 3 0.28 ******* 0.07 2.68 102.68 15809. 0.363 4 0.34 ******* 0.08 2.82 102.82 16584. 0.381 5 0.30 ******* 0.05 2.24 102.29 13188. 0.303 6 0.17 ******* 0.02 2.14 102.19 12600. 0.289 7 0.22 '**'*** �,02 1.95 101.95 =1985. 0.��- ., ..�.cc .a+....r �.�.,�. _..,4 __�1..:`i rll_�_. _.�_� KCRTS Routinq Instructions Route Time Series thr�ach �ac�li-y Inflow Time Series File:dev.tsf Outflow Time Series Eile:RDOut Inflow/Outflow Analysis Peak Inflow Discharge: 0.585 �FS at 5:�0 cn Jan � in Yea= � Peak Outflow Discharge: 0.121 CFS at 12:00 on Jan 9 in Year 8 Peak Reservoir Stage: 3.51 Ft Peak Reservoir Elev: 103.51 Ft �`�C��1V`' "r,� ' f O/ � ��J� Peak Reservoir Storage: 2C653. Cu-Ft V \J ��V�� - -�-�-.y��_- - Duration Comaarison Analvsis Duration Comparison Anaylsis Base File: predev.tsf New File: rdout.tsf Cutoff Units: Discharge in CFS -----Fraction of Time----- ---------Gheck of Tolerance------- Cutoff Base New �Change Probability Base New �Change 0.025 I 0.92E-02 0.61E-02 -34.2 � 0.92E-02 0.025 0.022 -11.6 0.031 � 0.62E-02 0.52E-02 -15.8 � 0.62E-02 0.031 0.025 -22.1 0.038 � 0.98E-02 0.46E-02 -4.7 � 0.48E-02 0.038 0.035 -8.5 0.045 I 0.37E-02 0.38E-02 1.8 � 0.37E-02 0.095 0.045 0.5 0.051 � 0.29E-02 0.27E-02 -6.9 � 0.29E-02 0.051 0.049 -5.3 0.058 � 0.22E-02 0.20E-02 -7.9 � 0.22E-02 0.058 0.056 -3.2 0.065 � 0.15E-02 0.15E-02 2.2 � 0.15E-02 0.065 0.066 1.1 0.071 � 0.99E-03 0.95E-03 -9.9 � 0.99E-03 0.071 0.071 -0.3 0.078 � 0.62E-03 0.59E-03 -5.3 � 0.62E-03 0.078 0.078 -0.5 0.085 � 0.39E-03 0.29E-03 -14.3 I 0.34E-03 0.085 0.084 -0.5 0.091 � 0.21E-03 0.98E-04 -53.8 � 0.21E-03 0.091 0.088 -3.9 0.098 � 0.16E-03 O.00E+00 -100.0 I 0.16E-03 0.098 0.090 -6.7 0.105 � 0.11E-03 O.00E+00 -100.0 � 0.11E-03 0.105 0.091 -12.9 0.111 � 0.16E-04 O.00E+00 -100.0 � 0.16E-04 0.111 0.093 -16.8 Maximum positive excursion = 0.001 cfs ( 2.5�) occurring at 0.093 cfs on the Base Data:predev.tsf and at 0.044 cfs on the New Data:rdout.tsf Maximum negative excursion = 0.008 cfs (-23.3�) occurring at 0.039 cfs on the Base Data:predev.tsf and at 0.026 cfs on the New Data:rdout.tsf __.. , �-<,�. <.,�s: - �Y„_ � �6v.,ve-wrw�a�.y:�=la�irs ' - . --�--�-"-- =' __.,.. -. , . . . ,.... . . , .. ._,. �-.,._�: . . . . . ...<,... _.... -'� ..:,-=-�- . .... ._ .. ._. _ _o. 0 RDOut dur �- Targe[.dur • i I o {2 o i ' m ` o i � � I U � I m o i a `m � c O � � 0 .� N � �� O O -_ O __'_ O O 10 j' 10� 10 3 10 � 10 � 1Q� ��H E�ceeOence ��1�a 1J �ol�'D ��7.�f� I '' ��Y- �1��-� �� ' L�-� �l>� �o�-- � ��- s�� . �2� 5 Co�� s � �� 7,�-, � I 2 �' l 5��(o� - 1 n � �Z7 ��2" � � � /r ��22 -1,�,��' � �I z� - � f '� �-ZCo �� I � � � � �1`� �1 ��,�2� � � �� S� , �1'2� � �Co a , � /7 �'�� ) �� Z �� I �1 � �-z� �oo� - 2� � ��- l d7� I �?�� ' �� -2Z6�� iZ� C� o ' , ��1�,rv �lat.vr�l1� �. �, c�5� �c-�' C��vl w-�) �� U� 5�� g2� ��- tg, �� ° �� 3 � d. 1 Ft' X��nc� � �-2� �-t�� - �-,q�I2 2-(�, (�� - 1�, � �S : o . �� . _ r, �� — �`Z��2� `�� '��.�-- �- ��• Z� I II I � � M N � � � N J Q � a oc W Q 3 Wetpool Sizing Calculations Per 2009 King County Stormwater Management Manual Project Name: Renton 7 Short Plat Project Number: 3800 square feet per Lot Updated 06/18/2014 Facility Description: Water Quality Sizing Step 1: Identify required wetpool volume factor(f). f= 3 Per KCSWDM 6.4.1.1 Step 2: Determine rainfall (R)for the mean annual storm. R= 0.47 Per KCSWDM Fig. 6.4.1.A Step 3: Calculate runoff from the mean annual storm (V�)for the developed site. V�_ (0.9A;+ 0.25A,9+0.10A,�+ 0.01Ao)x(R/ 12) where: A; = Impenrious Surface Area = 39,668 s.f. A�y =Till Grass Area = 37,433 s.f. A,� =Till Forest Area = 0 s.f. Ao = Outwash Area = 0 s.f. V�= 1�765 C.f. Step 4: Calculate required wetpool volume(Vb). Vb= fxV� Vb= 5,295 c.f. ,' . .�',�� Z�'� < ��-� -z. �, –�� . � � �� ,�� `�:�z� j�- 1..� � � -.—Z�2.� � ��` � l�� -t� '�� '.�-�� `. �_ `Z� '�!��J �titi�,. � � � �.� ��d �� Z;� � ' � �- � �r� �� -- �ti.�'L � �ti� ! �`?� � � -� �'�'J �� 1 � ! � � , �2 � �� L�3 7 l� �Y� � � � � � l ��1 � _ ��. �`� -�-- �1�2��'2 ,�. � �� L �22� ��ti�� -�-�11 � -��' ��:� � .� , ,� ,��`�_ �'�� L�!�� . �-� "�� -�-?_L tn'� ��.�l.?�,7 �� __ �(G�� . � . � �� °� ��' /� – �� . '� ��,�� -1�c� ��j� `�'�'�� - � �y�� . r��c� ��=�� __ _ _ _ _ I Section 5: Conveyance System Analysis and Design I An analysis of the new conveyance system is attached to this section. The new conveyance system was I analyzed using the"Rational Method of Analysis"per section 3.2 of the King County Drainage Manual. The I system was checked using a 25 year storm event flow rate of 2.75 cfs from runoff of the entire parcel. A portion of the system was checked using a 100 year storm event of 3.20 cFs. The portion analyzed for the i, 100 year event was a"redundant overtlow"system which would convey the pond flows if the pond elevation I exceeded the overtlow riser. This system connects to Nile Avenue NE in a different location than the control ' � structure for the pond. Based upon these flows, a backwater analysis was performed on the new conveyance system. The analysis concluded that the new storm system is adequate to convey the 25 year storm event and the'�redundant overtlow"system can convey the 100 year event. I Renton 7 �� Rational Method Runoff from Developed Basin �I P(25) 3.40 inches (from attached Isopluvials Map) � P(100) 3.90 inches A(T) 1.77 Acres Acres A(1) 0.81 Impervious areas - paving, sidewalk, driveways, roofs, patios, etc. A(2) 0.96 Pervious areas - landscape, lawn, shrubs, etc. 1J7 Description of Flow Path k0 L1 120 feet si 0.025 Lawn/Landscaping 7.0 L2 146 feet s2 0.01 Pipe 20.0 L3 80 feet s3 0.01 Pond 20.0 L4 234 feet s4 0.005 Pipe 20.0 Composite Runoff Coefficient A(1) C(1) 0.90 , �� A(2) C(2) 0.25 �� COO 0.81*0.90+0.96*0.25/1.77 0.55 Time of Concentration T(1) 120/60*{(7.0)*(0.025)**(0.5)} 1.8 Minutes T(2) 146/60*{(20.0)*(0.01)**(0.5)} 1.1 Minutes T(3) 80/60*{(20.0)*(0.01)**(0.5)} 1 Minute ' T(4) 234/60*{(20.0)*(0.005)**(0.5)} 1.2 Minutes USE 6 Minutes '� � Compute i0 ip=(aR)*(Tc)**(-bR) i0=2.66*6**-0.65 0.83 ((25 year event)) i�=2.61*6**-0.63 0.84 ((100 year event)) Compute I(25) I(25)=P(25)*I� I(25)=3.40*.83 2.82 I(100)=3.90*.84 3.28 Q(25)=C*I(Z5)*A(� Q(25)=0.55*2.82*1.77 2.75 cfs Q(100)=0.55*3.28*1.77 3.20 cfs I SECTION 3.2 RUNOFF COMPUTATION AND ANALYSIS METHODS i FIGURE 3.2.1.0 25-YEAR 24HOUR ISOPLiJVIALS �S �---- - --- _ _ SN MOMiSH COUNTV I �s ..... _� -_ a ` -- c_ __ __ _— -- KINGGOUNTV w� nt�� -� . j: � 'j. �i 28 ( - �3 �— -_ �Q � � � !t�- _ � �' - _ p`h �� - � = a�� _ --- _ �_ f �, , 3 3 — 1`, :� _. �' .�s,� *' _ - �'�` t, y _, � __ �6 �� o�,� � .-.� , _ ._.�__ �� Ic � � � I �i _ I - I ��', - ` �� . - I�� i ' j I � J � —_ 5.0 I'I ;,�_ .E _ m�� ___ � I �� _ _ — 'I jf �� `� � � �� _ � E� , .. �� • E.0 � � �� ° ; o. .;�� . �s � , � -- { � - , - � _ / .E. � �� • ._ � _ (j � _ . L 9 �� .�� .. v_ .. j_ . - - - � . . o[ ? s I ' ^ � � / j I __ � _. ; V�Gi .� ._ ._ ' . ? , nc ox r�i __ ,. . �, < -. -- . ___- __ �� - �: � _ - "__' __. - ,. � ' - i - � ' i�� . M - S ' � � ��ein ._ r _ G n � ^ `� �x � � _ �; - - - p; �• � � \ m � - - � A. �_y�o�.�_�" _NING COUNTV v. v �• PIERCE COUNTY WESTERN � �� - KING COUNTY �,�; �- _ Ss N __ so � 4,5 25-Year 24-Hour � � -, � L r--, Precipitation `' � � � -� ^.�r�� in Inches °--�""'es �•�. � `�� L`9�2009 2009 Surface V4'ater Design Manual 3-16 3.2.1 RATIONAL METHOD FIGURE 3.2.1.D 100-YEAR 24-AOUR ISOPLUVIALS 3�_� ___ ____ �__ _��_ _�� _� __ _ COUNTY 3� - wo Li N COUNTY 3 � s _aE_ L�� — •� .. li _ — .- 3j3 =_.. �A 3S 4 9 8 ."E ., .o.� - �0 = �,� �' 42 .:�w.. � � o�.r •3 � � ._... aE_, IE.e y� a Q _[ �s : � a+ - :� , — _ : � -� `_ ,.., : .»� m � � � Cp�C� - ,� � - � � � . .. ��.z � -- � a� � p�.o�- . . ;. .�_ _. - - m _ � .,e� - _ � .\ ^ o m � � '� � .«o. - '� � _y_� ___ K G COUNTY � .� I PIE CE COUNiY WESTERN o� '� � '�_ KING COUNTY �o ,,�.P _ so N D�� , — 5.5 100-Year 24-Hour ' °`� �'� �,,� � Preci itation ' °`� y - f~� in Inches 0�2�4Miles °`' ho , '��'�� h� 2009 Surface VJater Design Manual 1/9/2009 3-17 3.2.1 RATIONAL METHOD TABLE 3.2.1.A RUNOFF COEFFICIENTS-"C"VALUES FOR THE RATIONAL METHOD General Land Covers Single Family Residential Areas� Land Cover C Land Cover Density C Dense forest 0.10 0.20 DU/GA(1 unit per 5 ac.) 0.17 , Light forest 0.15 0.40 DU/GA(1 unit per 2.5 ac.) 020 Pasture 0.20 0.80 DU/GA(1 unit per 1.25 ac.) 0.27 Lawns 0.25 1.00 DU/GA 0.30 Playgrounds 0.30 1.50 DU/GA 0.33 I Gravel areas 0.80 2.00 DU/GA 0.36 I Pavement and roofs 0.90 2.50 DU/GA 0.39 Open water(pond, lakes, 1.00 3.00 DU/GA 0.42 wetlands) 3.50 DU/GA 0.45 4.00 DU/GA 0.48 4.50 DU/GA 0.51 5.00 DU/GA 0.54 5.50 DU1GA 0.57 6.00 DU/GA 0.60 �Based on average 2,500 square feet per lot of impervious coverage. For combinations of land covers listed above,an area-weighted "CcX A�'sum should be computed based on the equation C� x A,_(C,x A,)+(CZ x AZ)+ ...+{C�x A„),where A,_(A�+AZ+ ...+An),the total drainage basin area. TABLE 3.21.B COEFFICIE'VTS FOR THE RATIONAL 1��IETHOD "iR"EQUATION Design Storm Return Frequency aR bR 2 years 1.58 0.58 5 years 2.33 0.63 10 years 2.44 0.64 25 years 2.66 0.65 50 years 2.75 0.65 100 years 2.61 0.63 TABLE 3.2.1.0 kR VALLiES FOR Tt USING THE RATIONAL METHOD Land Cover Category kR Forest with heavy ground litter and meadow 2.5 Fallow or minimum tillage cultivation 4.7 Short grass pasture and lawns 7.0 Nearly bare ground 10.1 Grassed waterway 15.0 Paved area (sheet flow}and shallow gutter flow 20.0 2009 Surface VVater Design Manual 1/9/2009 3-13 SECTION 4.2 PIPES,OUTFALLS,AND PUMPS 1.49 z;3 vz (4-1) v = R S n ' or use the continuity equation, Q=AV,such that: 1.49 �Rz�s Svz (4-2) Q — n where Q = dischazge(cfs) V = velocity(fps) � A = area(s� � n = Manning's roughness coefficient; see Table 4.2.1.D below R = hydraulic radius=area/wetted perimeter(ft) S = slope of the energy grade line(ft/ft) For pipes flowing partially full,the actual velocity may be estimated from the hydraulic properties shown in Figure 4.2.1.G by calculating Qfurr and Vf„�t and using the ratio Qdes,g„/Q�,rr to find V and d(depth of flow). Table 4.2.1.D provides the recommended Manning's "n"values for preliminary design using the Uniform Flow Analysis method for pipe systems. Note: The "n"values for this method are 1 S%higher in order to account for entrance, exit,junction, and bend head losses. TABLE 4.2.1.D MANNING'S "n" VALUES FOR PIPES Type of Pipe Material Analysis Method Uniform Flow Backwater Flow (Preliminary (Capacity design) Verification) A. Concrete pipe and LCPE pipe 0.014 0.012 B. Annular Corrugated Metal Pipe or Pipe Arch: 1. 2�/3'x'/2'corrugation(riveted): a. plain or fully coated 0.028 0.024 b. paved invert(40%of circumference paved): 1) flow at full depth 0.021 0.018 2) flow at 80%full depth 0.018 0.016 3) flow at 60%full depth 0.015 0.013 c. treatment 5 0.015 0.013 2. 3"x 1"corrugation 0.031 0.027 3. 6"x 2"corrugation (field bolted) 0.035 0.030 C. Helical 2-2/3'x'/z' corrugation and CPE pipe 0.028 0.024 D. Spiral rib metal pipe and PVC pipe 0.013 0.011 E. Ductile iron pipe cement lined 0.014 0.012 F. SWPE pipe(butt fused only) 0.009 0.009 N� ,2 � �I�P 1/9/2009 2009 Surface Water Design Manual 4-20 STORMWATER CONVEYANCEBACKWATER CALCULATIONSHEET (1) (z) (3) (4) (5) (6) (�) (8) (9) (1�) (11) (12) (13) Barrel Entrance Entrance Pipe 25 year Pipe Outlet Inlet Barrel Barrel Velocity TVV Friction HGL Head Segment Q Length Pipe "n" Elev Elev Area Velocity Head Elev Loss Elev Loss CB to CB cfs) ft Size Value feet) feet s . feet f s (feet (feet feet feet feet) Ex.CB-#1 2.75 5 15" 0.011 421.56 421.59 1.23 2.24 0.03 423.06 0.01 423.07 0.01 #1-#2 2.75 62 15" 0.011 421.59 421.90 1.23 2.24 0.03 423.15 0.11 423.26 0.01 #2-Pond 2.75 167 15" 0.011 421.90 422.74 1.23 2.24 0.03 423.34 0.28 423.62 0.01 Redundant OverFlow Ex.C6-#3 3.20 6 12" 0.011 425.10 425.13 0.79 4.05 0.06 426.50 0.02 426.52 0.01 #3-#4 3.20 162 12" 0.011 425.13 425.94 0.79 4.05 0.06 426.59 0.50 427.09 0.01 Use 150'above exlstino IEna tie in CB 426 50 C�redundant connection to ex, CB (14) (15) (16) (17) (18) (19) (20) (21) Exit Outlet Inlet Approach Bend Junction Pipe Head Control Control Velocity Head Head HW RIM ELEV Segment Loss Elev Elev Head Loss Loss Elev UPSTREAM CB to CB feet feet feet feet feet feet feet ca Ex.C6-#1 0.03 423.11 422.19 0 0.01 0.03 423.15 427.50 OK.� #1-#2 0.03 423.30 422.50 0 0.01 0.03 423.34 429.60 OK.� #2-Pond 0.03 423.67 423.34 0 0 0 423.67 428.25 OK.� Ex.C6-#3 0.06 426.59 425.73 0 0.00 0.00 426.59 429.30 OK.� #3-#4 0.06 427.17 426.54 0 0.04 0 427.21 427.40 OK.� _ _ _� STORMWATER CONVEYANCEBACKWATER CALCULATIDNSHEET (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) Barrel Entrance Entrance Pipe 25 year Pipe Outlet Inlet Barrel Barrel Velocity TVV Friction HGL Head Segment Q Length Pipe "n" Elev Elev Area Velocity Head Elev Loss Elev Loss CB to CB cfs ft Size Value feet feet s . feet f s feet (feet feet feet feet Pond-CB#6 2.75 32 12" 0.011 421.76 423.06 0.79 3.48 0.05 427.�0 0.005 427.21 0.011 #6 - #10 2.75 94 12" 0.011 423.06 424.84 0.79 3.48 0.05 427.27 0.091 427.36 0.011 #10-#12 2.75 20 12" 0.012 424.84 426.33 0.79 3.48 0.05 427.43 0.019 427.45 0.011 #6-#7 2.75 20 12" 0.011 423.06 423.48 0.79 3.48 0.05 427.27 0.019 427.29 0.011 #7-#8 2.75 16 12" 0.011 423.48 424.30 0.79 3.48 0.05 426.00 0.016 426.02 0.011 #8-#9 2.75 100 12" 0.011 424.30 425.80 0.79 3.48 0.05 426.08 0.097 426.18 0.011 (14) (15) (16) (17) (18) (19) (20) (21) 427,20 0verf/owe%vation ofpond Exit Outlet Inlet Approach Bend Junction Head Control Control Velocity Head Head HW RIM ELEV Loss Elev Elev Head Loss Loss Elev UPSTREAM feet feet feet feet feet feet feet CB 0.05 427.27 423.66 0 0 0 427.27 429.93 OK.� 0.05 427.43 425.44 0 0 0 427.43 429.08 OK.� 0.05 427.51 426.93 0 0 0 427.51 429.08 OK.� 0.05 427.35 424.08 0 0 0 427.35 429.08 OK.� 0.05 426.08 424.90 0 0 0 426.08 428.70 OK.� 0.05 426.24 426.40 0 0 0 426.40 428.80 OK.� ( ( � � Section 6: Special Reports and Studies ; (, Geotechnical Study attached ( �_ _7 � l-_ . � i � ;- ( _ � RoUert M. Pride, LLC Consulting Engineer August �, 2oi3 Mr. Gary Upper JayMarc Homes P. O. Box 2566 Renton, WA 98056 Re: Geotechnical Recommendations Proposed Short Plat 2�c Nile Avenue NE Renton, Washington RMP Project No. i3-i5i-oi Dear Mr. Upper, This report summarizes the results of our site assessment and geologic research on the residential property located on the west side of Nile Avenue NE in Renton. It is understood that new residences will be constructed on this seven lot subdivision. The purpose of this report is to describe existing site and subsoil conditions, and to provide recommendations for site development and foundation design. Geologic mapping by Booth, et al in 200�along with prior investigations in this area were used as references for this report. Site Conditions This rectangular properry is relatively flat and covers an area of about i.8 acres. F�cisting residential properties are located on the north,west and south sides of this property. Access to these proposed residences will be provided by a driveway off of Nile Avenue. According to geologic mapping for this area of Renton the property is underlain by very dense glacial till (Qvt)that consist of fine silty sands and sands. These soils have very low permeability and will not allow for onsite storm water infiltration into this very dense glacial formation. Geotechnical Recommendations Based on the results of our site assessment the following recommendations have been prepared for site development and foundation design. The dense native soils will provide excellent support for the new residence foundations using a recommended bearing value of 250o ps£ Estimated footing depths below final building pad grades will not exceed i.5 to 2 feet. A passive earth pressure of 25o pcf may be used for lateral force restraint around the perimeter foundation walls. Robert M. Pride, LLC Page 1 13203 Holmes Point Drive NE Kirkland,WA 98034 __ _ _ _ ___ _ _ 1 Foundation subdrains should be installed around the perimeter building foundations, and these PVC drain pipes should be protected with drain gravel and a geofilter cloth. Storm water runoff from the roof and impervious surface areas should be collected for discharge into the City storm drain system due to the highly impervious nature of the glacial till subsoils. Concrete Floor Slabs Interior house slabs may be poured directly on the native dense soils after placement of an impervious moisture barrier that is covered with 2 inches of sand. All concrete should be placed in accordance with current ACI standards. Summarv Field inspection and consultation services should also be provided to verify that subsurface conditions are as expected. Should conditions be revealed during construction that differs from the anticipated subsurface profile,we will evaluate those conditions and provide alternative recommendations where appropriate. Our findings and recommendations provided in this report were prepared in accordance with generally accepted principles of engineering geology and geotechnical engineering as practiced in the Puget Sound area at the time this report was submitted. We make no other warranty, either express or implied. Please call me if there are any questions. Respectfully, il .l i. ! 1,,� ` ~Ay�i� ,r� ��'�4 �P 4 T '�.��"^ I "�'_� ' I r I�' �.,y�:,`��;:-��'�� ,�� t�.�_,_. � �•- �� (r�yti„______ ��:Nl ...: � M` '�,":L'�-u Fr�,�:s 7 '2c-��_� Robert M. Pride, P. E. Principal Geotechnical Engineer dist: (i} Addressee Tmp: JayMarcNilei Robert M. Pride, LLC Page 2 13203 Holmes Point Drive NE Kirkland, WA 98034 Robert M. Pride, LLC Consulting Engineer January 30, 2oi4 Mr. Gary Upper c/o Darrell Offe Offe Engineers 13932 SE i59th Place Renton, WA 98058 Re: Geotechnical Recommendations Proposed Renton�Short Plat 2xx Nile Avenue NE Renton, Washington RMP Project No. 13-15i-oi Dear Mr. Offe, This report provides additional information regarding discharge of storm water on this new short plat development located on the west side of Nile Avenue and north of NE 2aa Street in Renton. It is understood that limited infiltration is being proposed for this short plat of seven residences, and that a soil classification is required for the soils that will allow for this infiltration. Based on my site inspection and geologic research the upper soils consist of silty sands and sands that will perform adequately for low storm water discharge into these granular sediments. I have classified these upper soils as "loamy sands and sandy loam" in accordance with the King County Design Manual —Table 4.5.2. Maximum infiltration rates range from 25 to 6o min/inch for these onsite soils. Please call if there are any questions. Respectfully, ,,`t.ln1�� r `'a�f?J' .J _� i: '�'� _� r t, � ' ` �� '-��`��, , ' .� ; � �� `!`;--�v;�--�/ `�•�� . 4�,'%\ -_�. - . G`��.i� ..�'��:�"4-t.` r--W'—_—_--�----- �--.:s��—==_._ �--- _� Robert M. Pride, P. E. Principal Geotechnical Engineer dist: (�) Addressee Tmp: JayMarcNileg Robert M. Pride, LLC Page 1 13203 Holmes Point Drive NE Kirkland,WA 98034 Section 7: Other Permits NPDES— stormwater permit from Wash. State Dept. of Ecology Water extension permit from WD#90 Section 8: CSWPPP Analysis and Design The proposed development and improvements comprise of 1.77 acres of property. An erosion and sedimentation control plan has been designed for the project. Portions of vegetation will be retained during the plat improvements to allow for filtering of construction runoff. A temporary pond has been placed on the southeast corner of Lot 7 to collect any runoff and treat before entering the City conveyance system within Nile Avenue NE. Erosion control for the project will consist of filter fabric fencing along the westerly and southerly property lines. Utilizing cut off swales to convey runoff into the temporary pond. The property is proposed to be cleared but not grubbed during the plat improvement permit. This un-disturbed soil condition will allow for additional filtering on site of construction runoff. Section 9: Bond Quantities, Facility Summaries, and Declaration of Covenant A Declaration of Covenant(Operation, maintenance, and restrictions) is attached for the proposed BMP's shown on the civil construction plans. SITE IMRPOVEMENT BOND QUANTITY WORKSHEET Site Improvemen# Bond Quantity Worksheet S,5 Webdate: 02/22/2013 � King County Department of Permitting &Environmental Review 35030 SE Douglas Street, Suite 210 � Snoqualmie, Washington 98065-9266 For alternate formats, call 206-296-6600. 206-296-6600 T'fY Relay 711 Project Name: ��.I� wl�' � �74 T�JF�I , �'�J Date: J,l�tvl �, � �� Location: }�� [��T '� N 1� �1`C � � Project No.: � �4 �� Activity No.: � Note: All prices include labor, equipment, materials, overhead and Clearing greater than or equal to 5,000 board feet of timbei'? profit. Prices are from RS Means data adjusted for the Seattle area , or from local sources if not included in the RS Means database. yes no If yes, Forest Practice Permit Number: (RCW 76.09) � Page 1 of 9 Unit prices updated: 02/12/02 Version: 11/26/2008 li-wks-sbq.xls Report Date: 09l09/2013 Ii S15 Web date: 07122/2013 I Site improvement Bond Quantity Worksheet Unit #of � Reference# Price Unit Quanti plications Cost EROSION/SEDIMENT CONTROL Number Backfill 8 com action-embankment ESC-1 $ 5.62 CY Check dams, 4"minus rock ESC-2 SWDM 5.4.6.3 $ 67.51 Each b � Crushed surfacing 1 1/4"minus ESC-3 WSDOT 9-03.9(3) $ 85.45 CY Ditching ESC� $ 8.08 CY Excavation-bulk ESC-5 $ 1.50 CY Fence, silt ESC-6 SWDM 5.4.3.1 $ 1.38 LF Fence,Tempora (NGPE) ESC-7 $ 1.38 LF Hydroseedin ESC-8 SWDM 5.4.2.4 $ 0.59 SY Jute Mesh ESC-9 SWDM 5.4.2.2 $ 1.45 SY Mulch, by hand, straw,3"dee ESC-10 SWDM 5.4.2.1 $ 2.01 SY Mulch, b machine, straw,2"dee ESC-11 SWDM 5.4.2.1 $ 0.53 SY Pi in ,tem ora , CPP,6" ESC-12 $ 10.70 LF Pi in ,tem ora , CPP,8" ESC-13 $ 16.10 LF ' Pipin ,tempora , CPP, 12" ESC-14 $ 20.70 LF Plastic coverin ,6mm thick, sandba ed ESC-15 SWDM 5.4.2.3 $ 2.30 SY Rip Rap, machine laced;slopes ESC-16 WSDOT 9-13.1(2) $ 39.08 CY Rock Construction Entrance,50'x15'x1' ESC-17 SWDM 5.4.4.1 $ 1,464.34 Each Rock Construction Entrance, 100'x15'x1' ESC-18 SWDM 5.4.4.1 $ 2,928.68 Each Sediment pond riser assembt ESC-19 SWDM 5.4.5.2 $ 1,949.38 Each Sediment tra , 5' hi h berm ESC-20 SWDM 5.4.5.1 $ 17.91 LF Sed.trap,5'high,riprapped spillway berm section ESC-21 SWDM 5.4.5.1 $ 68.54 LF Seedin , b hand ESC-22 SWDM 5.4.2.4 $ 0.51 SY Soddin , 1"dee ,�level round ESC-23 SWDM 5.4.2.5 $ 6.03 SY Sodding, 1"dee , slo ed round ESC-24 SWDM 5.4.2.5 $ 7.45 SY TESC Supervisor ESC-25 $ 74.75 HR Water tnick, dust control ESC-26 SWDM 5.4.7 $ 97.75 HR WRITE-IN-ITEMS **** see a e 9 Each � ESC SUBTOTAL: $ - ,� 30°h CONTINGENCY 8�MOBILIZATION: $ �p- 7�(p ESC TOTAL: $ � COLUMN: Page 2 of 9 Unit prices updated: 02/12/02 Version: 11/26l2008 li-wks-sbq.xls Repo�t Date: 09/09/2013 Web date: 72l02/2008 Site Improvement Bor�d Quantity Worksheet � Extsting Future Public Private Quantity Completed Right-of-Way Right of Way Improvements (Bond Reduction)• 8�Drafna e Facilities Quant. Unit Price Unit Quant. Cost Quant. Cost Quant. Cost Com lete Cost GENERALITEMS No. Backfill&Com action-embankment GI-1 $ 5.62 CY Backfill 8 Com adion-trench GI-2 S 8.53 CY Clear/Remove Bnuh b hand GI-3 $ 0.36 SY Clearin lGrubbin ree Removal GI-4 $ 8 876.16 Acre . Excavation-bulk GI-5 $ 1.50 CY � Excavation-Trench GI-6 $ 4.06 CY Fencin cedar 6'hi h GI-7 5 18.55 LF Fencin chain link vin I coated, 6'hi h GI-8 $ 13.44 LF Fencin ,chain link, ate,vin coated 2 GI-9 $ 1,271.81 Each Fencin ,s lit rail 3'hi h - GI-10 S 12.12 LF Fill&com act-common barrow GI-11 $ 22.57 CY Fill&com act- ravel base GI-12 $ 25.48 CY Fill 8 com act-screened to soil GI-13 $ 37.85 CY Gabion 12"dee stone filled mesh GI-14 $ 54.31 SY Gabion, 18"dee ,stone filled mesh GI-15 $ 74.85 SY Gabion 36"dee stone filled mesh GI-16 $ 132.48 SY Gradin fine,b hand GI-17 $ 2.02 SY Gredin fine,with rader GI-18 b 0.95 SY Monuments 3'lon GI-19 S 135.13 Each Sensitive Ateas Si n GI-20 S 2.88 Each Soddin ,1"dee ,slo ed round GI-21 3 7.46 SY Surve in line 8 rade GI-22 $ 788.26 Da Surve in ,lot IocatioMines GI-23 $ 1,556.64 Acre Traffic control crew 2 fla ers GI-24 $ 85.18 HR Trail 4"chi ed wood GI-25 $ 7.59 SY Trail 4"crushed ander GI-26 $ 8.33 SY Trail 4"to course GI-27 $ 8.19 SY Wall retainin concrete GI-28 $ 44.16 SF Wall,rocke GI-29 $ 9.49 SF Page 3 of 9 SUBTOTAL v � (/ Unit prices updated: 02/12/02 'KCC 27A authorizes only one bond reduclion. VefSlOn: 11/26/08 ii-wks-sbq.xis Report Date:09/09/2013 �� mprovement r3onq c�uantity Worksheet "1e°°a�: ,�°"`°°� Existing Future Public Private Bond Reduction` � Right-of-way Right of Way Improvements 8�Draina e Facilities Quant. Unit Price Unit Quant. Cost Quant. Cost Quant. Cost Com lete Cost ROADIMPROVEMENT No. AC Grindin 4'wide machine<1000s RI-1 $ 28.00 SY AC Gnndin 4'wide machine 1000-200 RI-2 � 15.00 SY AC Grindin 4'wide machine>2000s RI-3 $ 7.00 SY AC RemovaUDis osaURe air RI-4 $ 67.50 SY Barricade I RI-5 $ 30.03 LF Barricade e III Permanenl RI-6 $ 45.05 LF Curb 8 Gutter,rolled RI-7 $ 17.00 LF Curb&Gutter vertical RI-8 $ 12.50 LF Curb and Gutter demolition and dis osa RI-9 $ 18.00 LF Curb extruded as halt RI-10 $ 5.50 LF Curb,extruded concrete RI-11 $ 7.00 LF Sawcut as halt 3"de th RI-12 $ 7.85 LF Sawcut concrele er 1"de th • RI-13 $ 1.69 LF Sealant as halt RI-14 $ 1.25 LF Shoulder AC see AC road unit nce RI-15 $ - SY Shoulder ravei 4"thick RI-16 $ 15.00 SY Sidewalk,4"thick RI-17 $ 35.00 SY Sidewalk 4"lhick,demolition and dis os RI-18 $ 29.50 SY Sidewalk,5"thick RI-19 $ 38.50 SY � , Sidewalk,5"thick demolilion and dis os RI-20 $ 37.50 SY � Si n,handica RI-21 $ 85.28 Each Stri in er stall RI-22 $ 5.82 Each � Stri in thermo lastic for crosswalk RI-23 $ 2.38 SF I Stri in ,4"refleGorized line RI-24 � 0.25 LF Page 4 of 9 SUBTOTAL T�`� ► 1 � _"� "✓ 1 �r Unit prices updated: 02/12/02 I 'KCC 27A authorizes only one bond reduc6on. Version: 11/26/08 li-wks-sbq.xis Report Date:09/09/2013 Site Improvement Bond Quantity Worksheet Webdate: 12J02/2008 ExisUng Future Public Private Bond Reduction' Right-of-way Right of Way Improvements 8 Draina e Facilities Quant. Unit Pnce Unit Quanf: Cost Quant. Cost Quant. Cost Com lete Cost ROAD SURFACING (4"Rock=2.5 base 8 1.5"top course) For'93 KCRS(6.5"Rock=5"base&1.5"top course) For KCRS'93 additionat 2.5"base add RS-1 $ 3.60 SY AC Overla 1.5"AC RS-2 $ 11.25 SY AC Overla 2"AC RS-3 $ 15.00 SY AC Road,2" 4"rock First 2500 SY RS-4 $ 21_00 SY AC Road 2" 4"rock Q .over 2500SY RS-5 $ 19.00 SY AC Road 3" 4"rock,First 2500 SY RS-6 $ 23.30 SY AC Road 3" 4"rock Q .over 2500 SY RS-7 $ 21.00 SY AC Road 5" First 2500 SY RS-8 $ 27.60 SY AC Road,5" Q .Over 2500 SY RS-9 $ 25.00 SY AC Road 6" First 2500 SY S-1 $ 33.10 SY AC Road 6" Q .Over 2500 SY S-1 $ 30.00 SY As haft Treated Base 4"lhidc S-1 $ 20.00 SY Gravel Road 4"rock,First 2500 SY S-1 $ 15.00 SY Gravel Road,4"rock Q .over 2500 SY S-1 $ 8.50 SY PCC Road 5" no base over 2500 SY S-1 $ 27.00 SY PCC Road 6",no base over 2500 SY S-1 $ 25.50 SY Th(ckened Ed e S-1 $ 8.60 LF Page 5 of 9 SUBTOTAL �� Unit prices updated: 02/12/02 'KCC 27A authorizes only one bond reduction. VefSiOn: 11/26/08 li-wks-sbq.�ds Report Date: 09/09/2013 � vv6D oaie: 1uU'L'100FS ��« ��uvcri�ent dona �tuan ity VvorKsheet Existing Future Public Private Bond Reduction' Right-of-way Ftight of Way Improvements 8 Draina e Facilities Quant. Unit Price Unit Quant. Cost Quant. Cost Quant. Cost Com iete Cost I DRAINAGE (CPP=Corrugated Plas6c Pipe,N12 or Equivalent) For Cutvert ces Avere e of 4'coverwas assumed.Asaume rforated PVC is same rice as solid i . Access Road RID D-1 $ 21.00 SY I �� Bollards-fixed D-2 $ 240.74 Each I Bollards-removable D-3 $ 452.34 Each ` CBs indude(rame and lid CB T e I D-4 $ 1 257.64 Each CB T e IL D-5 1 433.59 Each CB T e II 48"diameter D-6 $ 2 033.57 Each ' for additional de th over 4' D-7 $ 436.52 FT CB T II 54"diameter D-8 $ 2,192.54 Each for additional de th over 4' D-9 $ 486.53 FT CB T e 11 60"diameter D-10 $ 2 351.52 Each I for additional de th over 4' D-11 536.54 FT CB T II 72"diameter D-12 $ 3 212.64 Each for additio�al de th over 4' D-13 $ 692.21 FT Throu h-curb Inlet Framework Add D-14 $ 366.09 Each Cleanout PVC 4" D-15 $ 130.55 Each Cleanout,PVC 6" D-16 $ 174.90 Each Cleanout PVC 8" D-17 $ 224.19 Each Culvert PVC,4" D-18 $ 8.64 LF Culvert,PVC,6" D-19 $ 12.60 LF Culvert PVC, 8" D-20 $ 13.33 LF Culvert PVC 12" D-21 $ 21.77 LF CulveA CMP 8" D-22 5 17.25 LF I Culvert CMP 12" D-23 $ 26.45 LF ' Culvert CMP 15" D-24 $ 32.73 LF Culvert,CMP, 18" D-25 S 37,74 LF , Culvert,CMP,24" D-26 3 53.33 LF Culvert CMP 30" D-27 $ 71.45 LF �I Culvert,CMP,36" D-28 $ 112.11 LF Culvert CMP,48" D-29 $ 140.83 LF '' CulveR CMP 60" D-30 $ 235.45 LF Culvert,CMP,72" D-31 $ 302.58 LF Page 6 of 9 SUBTOTAL � %�t�11� Unit prices updated: 02/12/02 'KCC 27A authorizes only one bond reduction. Version: 11/26/08 li-wks-sbq.ws Report Date:09/09/2013 � —� Site Improvement Bond Quantity Worksheet "'ebda�: ,y°yZ°°8 , ExisUng Future Public Private Bond ReducUon• Right-ot-way Right of Way Improvements DRAINAGE CONTINUED 8 Dralna e Facilities 4uant. No. Unit Price Unit Quant. Cost Quant. Cost Quant. Cost Com lete Cost Culvert,Concrete 8" 0-32 S 21-02 LF Culvert Concrete 12" D-33 b 30.05 LF Culvert Concrete 15" D-34 S 37.34 LF CuiveA Concrete 18" D-35 $ 44.51 LF CulveA Concrete 24" D-36 61.07 LF Culvert Concrete 30" 0-37 � 104.18 LF Culvert Concrete,36" D-38 $ 137.63 LF Culvert Concaete,42" D-39 S 158.42 LF Culvert Concrete 49" D-40 $ 175.94 LF Culvert CPP,6" D-41 a 10.70 LF Culvert CPP 8" D-42 $ 16.10 LF Culvert CPP 12" D-43 S 20.70 LF Culvert CPP 15" D-44 $ 23.00 LF Culvert CPP 18" D-45 $ 27.60 LF Culvert,CPP 24" D-46 � 36.80 LF Culvert CPP,30" D-47 S 48.30 LF Culvert CPP 36" D-48 55.20 LF Ditchin D-49 8.08 CY Flow Dis rsal Trench 1 436 base+ D-50 25.99 LF French Drain 3'de th D-51 S 22.60 LF Geotextile laid in Vench o ro ene D-52 $ 2.40 SY • InfiitraUon ond testin D-53 s 74.75 HR Mid-tank Access Riser 48"dia 6'dee D-54 S 1 605.40 Each Pond Overflow S illwa D-55 $ 14.01 SY RestrictodOil Se arator 12" D-56 S 1,045.19 Each Restrictor/Oil Se arator 15" D-57 $ 1 095.56 Each � RestrictorlOil Se arator 18" D-58 $ 1 148.16 Each Ri ra laced D-59 $ 39.08 CY Tank End Reducer 36"diameter D-60 a 1,000.50 Each Trash Rack, 12" D-61 a 211.97 Each Trash Rack 15" D-62 S 237.27 Each Trash Rack 18" D-63 $ 268.89 Each Trash Rack,21" D-64 � 306.84 Each Page 7 of 9 SUBTOTAL (/'/(/ Unit prices updated: 02/12/02 'KCC 27A authorizes only one bond reduction. Version: 11/26/08 ii-wks-sbq.ws Report Date: 09/09/2013 J ..aL,.a.2. �uUUGUOo � ,�- ,r„ • ��„�� u ��ar�� 'vvorKsnee� � � N Y Exlsting Future Public Private Bond Reduction* Right-of-way Right of Way Improvaments 8 Drafna e FaciliUes Quant. Unit Price Unit �uant. Price Quant. Cost Quant. Cost Complete COst PARKING LOT SURFACING No. 2"AC 2"to course rock&4"borrow PL-1 $ 21.00 SY 2"AC 1.5" to course&2.5"base cou PL-2 $ 28.00 SY 4"seled borrow PL-3 S 4.55 SY 1.5"to course rock 8 2.5"base course PL-4 S 11.41 SY UTILITY POLES 8� STREET LIGHTING Utiliry pole relocation costs must be accompanied by Franchise Utility's Cost Statament Ulili Pole s Relocation UP-1 Lum Sum Street Li ht Poles w/Luminaires UP-2 Each WRITE-IN-ITEMS Such as detentioNwater ualtt vaults. No. WI-1 Each WI-2 SY WI-3 CY WI-4 LF WI-5 FT WI-6 WI-7 WI-8 WI-9 � Vvl-10 �/ r.• w SUBTOTAL '� � SUBTOTAL(SUM ALL PAGES): � � 30°/v CONTINGENCY&MOBIUZATION: 7 GRANDTOTAL: 5 ( (xQ COLUMN: B C D E Page 8 of 9 � Unit prices updated: 02/12/02 'KCC 27A authorizes only one bond reduction. Vet'sion: 11/26/08 li-wks-sbq.xis Report Date:09/09/2013 Web date: 12/02/2008 I Site Improvement Bond Quantity Worksheet Original bond co tations prepared by: Name: � '� T •� . Date: PE Registratlon Number: ir-(p� Tel.#: " �• `L Firm Name: 1� C� Address: � � �� (�t� • ProJect No: ROAD IMPROVEMENTS&DRAINAGE FACILITIES FINANCIAL GUARANTEE REQUIREMENTS PERFORMANCE BOND' PUBLIC ROAD&DRAINAGE AMOUNT BOND'AMOUNT MAINTENANCE/DEFECT B�ND' � r REQUIRED AT RECORDING OR StabilizationlErosion Sediment ConVol(ESC) (A) $ �� - TEMPORARY OCCUPANCY'"` Existing Right-of-Way Improvements (B) $ �,(� '�j - Future Public Right of Way& Drainage Facilities (C) $��[� - Private Improvements (D) $ �QG� —�— Calculated Quantiry Completed (E) $ � - Total Right-of Way and/or Site Restoration Bond'/*" (A+B) $ �� 4�'� - (First$7,500 of bond'shall be cash.) M r Performance Bond'Amount (A+B+C+D) = TOTAL ('T) $ ?iZ� fj��j - T x 0.30 $ �j`!�►�j - OR '101'immum on �amounfis$�D. '�— Reduced Performance Bond"Total"" (T-E) $ ��`>- Use larger o x �o or - �B+C�X � �p� I Maintenance/Defect Bond`Total 0.25= $ �s 1p�/ - NAME OF PERSON PREPARING BOND•REDUCTION: Date: ' "NOTE: The word"bond"as used in this document means a financial guarantee acceptable to King County. "'NOTE: KCC 27A authorizes right of way and site restoration bonds to be combined when both are required. The restoration requirement shall Include the total cost for aU TESC as a minimum,not a maximum. In addition,correctNe work,both on-and off-slte needs to be included. Quantities shall reflect worse case sceoarios not Just minimum requirements. For euample,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°h of the original amount(�or as revised by ma'�r design changes. . � REQUIRED BOND'AMOUNTS ARE SUBJECT TO REVIEW AND MODIFICATION BY DDES Page 9 of 9 Unit prices updated: 02/12/02 Check out the DDES Web site at www.kincrcountv._aov/permits Version: 11/26/08 li-wks-sbq.xls Report Date: 09/09/2013 RECORDING REQUESTED BY AND W HEN RECORDED MAIL TO: CITY CLERK'S OFFICE CITY OF RENTON 1055 SOUTH GRADY WAY RENTON, WA 98057 DECLARATION OF COVENANT FOR MAINTENANCE AND INSPECTION OF FLOW CONTROL BMPS Grantor: �i l� Grantee: City of Renton Legal Description: f� b1� �� T�C�- � �� „��f��G �'M '{�,t/C '' 'T�-�i, f'�-C.�D 1�-DU1� Ti0 �'C��C ��F��c�b ��J �ot.yw�� rL c� P�9�_ ��lo�; Additional Legal(s)on: �N ��f I� ��, 1/V�1`�l NC�.c�.1��1. Assessor's Taac Parcel ID#: ��JG�7!d " 6•�� IN CONSIDERATION of the approved City of Renton(check one of the following) ❑ residential , building permit, ❑ commercial building permit, ❑ clearing and grading permit, 0 subdivision permit,or I hort subdivision permit for Application File No.LUA/S WP f�j�'�i��Z(� relating to the real property("Property")described above,the Grantor(s),the owner(s) in fee of that Property, hereby ' covenants(covenant)with City or Renton,a political subdivision of the state of Washington,that he/she(they)will observe, consent to,and abide by the conditions and obligations set forth and described in Paragraphs 1 through 8 below with regard to the Property. Grantor(s)hereby grants(grant), covenants(covenant), and agrees(agree)as follows: 1. Grantor(s)or his/her(their)successors in interest and assigns("Owners")shall retain,uphold, ', and protect the stormwater management devices, features,pathways,limits,and restrictions,known as ' flow control best management practices("BMPs"), shown on the approved Flow Control BMP Site Plan for the Property attached hereto and incorporated herein as Exhibit A. 2. The Owners shall at their own cost,operate, maintain,and keep in good repair,the Property's BMPs as described in the approved Design and Maintenance Details for each BMP attached hereto and incorporated herein as Exhibit B. '' , 3. City or Renton shall provide at least 30 days written notice to the Owners that entry on the ' Property is planned for the inspection of the BMPs. After the 30 days,the Owners shall allow the City of Renton to enter for the sole purpose of inspecting the BMPs. In lieu of inspection by the City,the Owners may elect to engage a licensed civil engineer registered in the state of Washington who has expertise in drainage to inspect the BMPs and provide a written report describing their condition. If the engineer option is chosen,the Owners shall provide written notice to the City of Renton within fifteen days of receiving the City's notice of inspection. Within 30 days of giving this notice,the Owners,or the engineer on behalf of the Owners,shal l provide the engineer's report to the City of Renton. If the report is not provided in a timely manner as specified above,the City of Renton may inspect the BMPs without further notice. 4. If the City determines from its inspection, or from an engineer's report provided in accordance with Paragraph 3,that maintenance,repair,restoration,and/or mitigation work is required for the BMPs, The City shall notify the Owners of the specific maintenance,repair,restoration,and/or mitigation work (Work)required under RMC 4-6-030. The City shall also set a reasonable deadline for completing the Work or providing an engineer's report that verifies completion of the Work. After the deadline has � passed,the Owners shall allow the City access to re-inspect the BMI's unless an engineer's report has ; been provided verifying completion of the Work. If the work is not completed properly within the time I� frame set by the City,the City may initiate an enforcement action. Failure to properly maintain the BMPs I is a violation of RMC 4-6-030 and may subject the Owners to enforcement under the RMC 1-3, including I fines and penalties. I 5. Apart from performing routine landscape maintenance,the Owners are hereby required to I obtain written approval from the City ar Renton before performing any alterations or modifications to the � BMPs. � 6. Any notice or approval required to be given by one party to the other under the provisions of this Declaration of Covenant shall be effective upon personal delivery to the other party,or after three(3) days from the date that the notice or approval is mailed with delivery confirmation to the current address on record with each Party. The parties shall notify each other of any change to their addresses. 7. This Declararion of Covenant is intended to promote the efficient and effective management of surface water drainage on the Property,and it shall inure to the benefit of all the citizens of the City of Renton and its successors and assigns. This Declaration of Covenant shall run with the land and be binding upon Grantor(s),and Grantor's(s')successors in interest and assigns. , 8. This Declaration of Covenant may be terminated by execution of a written agreement by the Owners and the City of Renton that is recorded by King County in its real property records. ' � � IN WI'FNESS WHEREOF,this Declaration of Covenant for the Maintenance and Inspection of Flow Control BMPs is executed this day of ,20 ,� GRANTOR, owner of the Property GRANTOR, owner of the Property I �` STATE OF WASHINGTON ) COLJNTY OF KING )ss. On this da ersonall ared before me: Y P Y aPPe to me known to be the individual(s)described in and who executed the within and foregoing instrument and acknowledged that they signed the same as their free and voluntary act and deed, for the uses and purposes therein stated. Given under my hand and official seal this day of ,20 Printed name Notary Public in and for the State of Washington, residing at My appointment expires C.?.11 PERFORATED PII'E CON`V"ECTION D TEXT OF INSTRUCTIONS Your property contains a stormwater management flow control BMP (best management practice) called a "perforated pipe connection,"which was installed to reduce the stormwater runoffi impacts of some or all of �i �' the im ervious surface on our ro e A erforated i e cannection is a!en th of draina e conve ance P Y P P �Y• P P P 9 9 Y pipe with holes in the bottom, designed to"leak"runoff,con�eyed by the pipe, into a gravel filled trench where it can be soaked into the surrounding soil. The connection is intended to provide opportunity for infiltration of any runoff that is being conveyed from an impervious surface (usually a roof) to a local drainage system such as a ditch or roadway pipe system. } The size and composition of the perforated pipe connection as depicted by the flow cantro! BMP site plan , and design details must be maintained and may not be changed without written approval either from the King County Water and Land Resources Division or through a future development permit from King ' Courrty. The soil overtop of the perforated portion of the system must not be compacted or covered with impervious materials. FIGL'RE C.2.11.A PERPORATID PIl'E COi�NI',CTIO\I'OR A SINGL�I'.�'VIILY 12ESID�1�1C� random fill � : � � �� 6 ,�< ; ;�� , filter fabrie ' �� ;,�e, � y� �� 6��perf pipe �i 78" min s°;,°n e,�}�<; ,''o :�tl _. I ' ° �;,� �u�.J ��,` ;:-1'/z"-3la washed rock `� �e3 el �,� .,�� U r .� t� G;4!.� '�,'_ c• �L` a, ;., • - , � , .� U ,f�V y:l:,:��t'� '. i+-J24" min-+I �' : TRENCH X-SECTION �� NTS slope —� to road drainage system 2' X10' /level trench w;'perf pipe �. PLAN VIEW OF RQOF � NTS , �` � '�i0��Surface A�'a�er Dzsi�n�Tanual—Appzndix C 1/9/3009 - � C-Sl �� EXHIBIT ��B" PERFORATED PIPE CONNECTION MAINTENANCE INSTRUCTIONS This lot contains stormwater management flow control BMP (best management practice) called a "perforated pipe connection," which was installed to reduce the stormwater runoff impacts of some or all of the impervious surface on your property. A perForated pipe connection is a length of drainage conveyance pipe with holes in the bottom, designed to "leak" runoff, conveyed by the pipe, into a gravel filled trench where it can be soaked into the surrounding soil. The connection is intended to provide opportunity for infiltration of any runofF that is being conveyed from an impervious surFace (usually a roo� to a local drainage system such as a ditch or roadway pipe system. The size and composition of the perforated pipe connection as depicted by the flow control BMP site plan and design details must be maintained and may not be changed without written approval from the City of Renton. The soil overtop of the perforated portion of the system must not be compacted or covered with impervious materials. SECTION C.2 FLOW CONTROL BMPs C.2.3.5 MAINTENANCE INSTRUCTIONS FOR LIMITED INFILTRATION If the limited infiltration flow control BMP is pmposed for a project,the following maintenance and operation instructions must be recorded as an attachment to the required declaration of covenant and grant of easement per Requirement 3 of Section C.133 (p.G 18). Ttie intent of these instructions is to explain to future property owners,the purpose of the BMP and how it must be maintained and operated. These instructions are intended to be a minimum;DDES may require additional instructions based on site- specific conditions. Also,as the County gains more experience with the maintenance and operation of these BMPs,future updates to the instrucfions will be posted on King County's Surface Water Design Manual website. ❑ TEXT OF INSTRUCTIONS Your property contains a stormwater management flow control BMP (best management practice)called "limited infiltration,"which was installed to mitigate the stormwater quantity and quality impacts of some or all of the impervious surfaces on your property. Limited infiltration is a method of soaking runoff from impervious area (such as paved areas and roofs) into the ground. Infiltrafion devices, such as gravel filled trenches, drywells, and ground surface depressions,facilitate this process by putting runoff in direct contact with the soil and holding the runoff long enough to soak most of it into the ground_ To be successful,the soil condition around the infiltration device must be able to soak water into the ground for a reasonable number of years. The infiltration devices used on your property include the following as indicated on the flow control BMP site plan: ❑ gravel filled trenches, ❑ drywells. The size, placement, and composition of these devices as depicted by the flow control BMP site plan and design details must be maintained and may not be changed without written approval either from the King County Water and Land Resources Division or through a future development permit from King County. Infiltration devices must be inspected annually and after major storm events to identify and repair any physical defects. Maintenance and operation of the system should focus on ensuring the system's viability by preventing sediment-laden flows from entering the device. Excessive sedimentation will result in a plugged or non-functioning facility. If the infiltration device has a catch basin, sediment accumulation must be removed on a yearly basis or more frequently if necessary. Prolonged ponding around or atop a device may indicate a plugged faality. If the device becomes plugged, it must be replaced. Keeping the areas that drain to infiltration devices well swept and Gean will enhance the longevity of these devices. For roofs, frequent cleaning of gutters will reduce sediment loads to these devices. li9/2009 2009 Surface Water Design Manual—Appendix C C-50 C.2.2 F'LTLL INFILTRATTON I FIGURE C.2.2.A TYPICAL TRENCH INFILTRATION SYSTEM '� roof drain Pu4N v�Ew NTS r— 4"rigid or 6"flexible perforated pipe •---------------------------------•-•-----------. intiltration trench sump w/solid lid PLAN VIEW root drain NTS overflow 4"rigid or 6"flexible splash block /�pe�forated pipe / .i �i;�i;�i>/i;ii� %��'�� i i i i /�N�i i�% .�!. .� 6" :o �v' 6� oC� �� washed rock 9 �° 0°A� c t'min 5.0'min 12"� `' ---�— 1 1/2"-3/4' o�' "� O°a o °� �min �' ----- ---•------------------�Q-°--�-----'��'. I tine mesh � CB sump w/solid lid I ��.m., I--- varies A filter fabric �compacted backtill 6" � . � `� 4"rigid or 6"flexible ° °� ° �� perforated pipe 24" °9 0 °� 4 � a��4° II��o washed rock v v 1� j �°p�oQa � .� 1 1/2"-3J4" 0 /� a o 9 0 � !/.�\��`<<C\�.�C\%% �--24" SECTION A NTS 2009 Surface W'ater Design?�ianual-Appendix C 1'9.2009 G45 Section 10: Operation and Maintenance Manual I � The Operation and Maintenance of the proposed BMP's provided will be included within the Declaration of Covenant from Section 9. These documents will be provided for review on as part of the utility permit mi I sub tta SECTION C.2 FLOW CONTROL BMPs C.2.3.5 MAINTENANCE INSTRUCTIONS FOR LIMITED INFILTRATION If the limited infiltration flow control BMP is proposed for a project,the following maintenance and operation instructions must be recorded as an attachment to the required declaration of covenant and grant of easement per Requirement 3 of Section C.133 (p.C-18). The intent of these instructions is to explain to future pmperty owners,the purpose of the BMP and how it must be maintained and operated. These instructions aze intended to be a minimum;DDES may require additional instructions based on site- specific conditions. Also,as the County gains more experience with the maintenance and operation of these BMPs,future updates to the instructions will be posted on King County's Surface Water Desigrr Manual website. TEXT OF INSTRUCTIONS Your property coMains a stormwater management flow control BMP (best managemerrt practice)called "limited infiltration,"which was installed to mitigate the stormwater quantity and quality impacts of some or all of the impervious surfaces on your property. Limited infiitration is a method of soaking runoff from impervious area (such as paved areas and roofs)into the ground. Infiltration devices, such as gravel filled trenches,drywells,and ground surface dep�essions,facilitate this p�ocess by putting runoff in dired contad with the soil and holding the runoff long enough to soak most of it into the ground. To be successful,the soil condition around the infiltration device must be able to soak water into the ground for a reasonable number of years. The infiltration devices used on your property indude the following as indicated on the flow control BMP site plan: ❑ gravel filled trenches, ❑ drywells. The size, placement, and composition of these devices as depicted by the flow control BMP site plan and design details must be maintained and may not be changed without written approval either from the King County Water and Land Resources Division or through a future development permit from King County. Infiltration devices must be inspeded annually and after major storm events to identify and repair any physical defects. Maintenance and operation of the system should focus on ensuring the system's viability by preventing sediment-laden flows from entering the device. Excessive sedimentation will result in a plugged or non-functioning facility. If the infiltration device has a catch basin,sediment accumulation must , be removed on a yearly basis or more frequerrtty if necessary. Prolonged ponding around or atop a device I may indicate a plugged facility. If the device becomes plugged, it must be replaced. Keeping the areas � that drain to infiltration devices well swept and dean will enhance the longevity of these devices. For roofs, frequent Geaning of gutters will reduce sediment loads to these devices. j * 1/9/2009 2009 Surface Water Design Manoal-Appendix C G50 C.2.11 PERFORATED PIPE CONNECTION ❑ TEXT OF INSTRUCTIONS Your property contains a stormwater management flow control BMP(best management practice) called a "perforated pipe connection,"which was installed to reduce the stormwater runoff impacis of some or all of the impervious surface on your property. A perforated pipe connection is a length of drainage conveyance pipe with holes in the bottom, designed to"leak" runoff, conveyed by the pipe, into a gravel fllled trench where it can be soaked into the surrounding soil. The connection is intended to provlde opportunity for ' infiitration of any runoff that is being conveyed from an impervious surface (usually a roof} to a local drainage system such as a ditch or roadway pipe system. The size and composition of the perforated pipe c�nnection as depicted by the flow conVol BMP site plan and design details must be maintained and may not be changed without written approval either from the IGng County Water and Land Resources Division or through a future development permit from King County. The soil overtop of the perforated portion of the system must not be compacted or covered with impervious materials. FIGURE C.2.11.A PERFORATID PIPE CONNECTI0I�T FOR A SINGLE FAMII.Y RFSmENCE random fill 6" ��%��%��%��/\��%��%� filter fabric � �%�\%��%��%�\%��%�\% 0 0 0 0 � „ o � 6"perf pipe 18" min °a°o o a°a°o o� � p oo °o o o � 1�Iz"- 31a"washed rock O ea QDoO oQ o� p o� o p oopo 0 0 0 0 0� o 0 0 0°o 0 0 0 �o 0 4 D O � o O o O � o O I+—24" min---�I TRENCH X-SECTION NTS S�oPe —► to road drainage system 2' X 10' level trench w/perf pipe PLAN VIEW OF ROOF NTS 2009 Surface Water Design Manual-Appendix C 1/9/3��9 C-81 APPENDIX A MAINTENANCE REQUIREIv�NTS FOR FLOW CONTROL,CONVEYANCE,AND WQ FACILITIES � NO. 5-CATCH BASINS AND MANHOLES Mairrtananca Defect or Problem Conditlon When Maintenanca is Needed Results Expected When Component Maintananca is Parformed Structure Sediment Sediment exceeds 6096 of the depth from the Sump of catch basin coMains no bottom of the catch basin to the invert of the sediment. lowest pipe into or out of the ptch basin or is within 6 inches of the invert af the lowest pipe into or out of the catch basin. Trash and debris Trash or debris of more than'r4 cubic foot which No Trash or debris blocking or is located immediately in front of the catch basin potentially blodcing entrance to opening or is blodcing capaaty of the catch basin catch basin. by more than 10%. Trash or debris in the catch basin that exceeds No Vash or debris in the catch basin. '!,the depth from the bottom of basin to invert the lowest pipe into or out of the basin. Dead animals or vegetation that could generate No dead animals or vegetation odors ihat could cause complaints or dangerous present within catcfi basin. gases(e.g.,methane). Deposits of gart�age exceeding 1 cubic foot in No condftion present which would volume. attrad or support the breeding of insects or rodents. Damage to frame Comer of frame extends more than'/.inch past Frame is even with curb. and/or top slab curb faoe into the street(If applicable). Top slab has holes larger than 2 square inches or Top slab is free of holes and cracks. cradca wider than'/.inch. Frame not sitti�ng flush on top slab,i.e., Frame is sitting flush on top slab. separation of more than'/.inch of the frame from the top slab. � Cradcs in walls or Cracka wider than 54 inch and longer than 3 feet, Catch basin is sealed and bottom any evidence of soil paRicles entering catch structurally sound. basin through cracks,or maintenance person judges that catch basin is unsound. Cradcs wider than'f,inch and longer than 1 foot No crecks more than'l.inch wide at at the joint of ar�r inleUoutlet pipe or any evidence the joint of inleUoutlet pipe. of soil paRides entering catch basin tfirough cradca. SettlemenU Catch basin has settled more than 1 inch or has Basin replaced or repaired to design misalignmerk rotaled more than 2 inches out of alignment. standards. Damaged pipe ja�s Cradcs wider than Y:-inch at the joint of the No cracks more than Y.-inch wide at inleUoutlet pipes or any evidence of soil entering the joint ot inleUoutlet pipes. the catch basin at the joint of the inleUoutlet P�P�• ContaminaMs and My evidence of contaminants or pollution such Materials removed and disposed of pallution as oil,gasoline,ooncrete slurries or paint. according to applicable regulations. Source oontrol BMPs implemented if appropriate. No contaminants present other than a surface oil film. InIeUOutlet Pipe SedimeM Sediment filling 20%or mo►e of the pipe. InleUoutlet pipes dear of sediment. accumulation Trash and debris Trash and debns accumulated in inleUoutlet No trash or debris in pipes. pipes(indudes floatables and non-Aoatables). Damaged Cracks wider than'rrinch at the joint of the No cracks more than'h-inch wide at inleUoutlet pipes or any evidence o(soil entering the joinf of the inleUoutlet pipe. at the joints of the inleUoutlet pipes. � 2009 Surface Water Design Manual—Appendix A 1 i9/2009 A-9 APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL,CONVEYANCE,AND WQ FACILITIES � I �'�j NO. 5-CATCH BASINS AND MANHOLES I �� Mainbenance Defect or Problem Conditlon When Maintenance(s Needed Resulfs Expectad Whan Componant Malntananca is Performed Metal C�ates Unsafe grate opening Grate with opening wider than'!,inch. Grate opening meets design (Catch Basins) standards. Trash and debris Trash and debris that is blodcing more than 20% Grate free of trash and debris. of grate surface. footnote to guidelines for disposal Damaged or missing Grate missing or broken member(s)of the grate. Grate is in place and meets design My open atructure requtres urgeM standards. ma(�tenanco. Manhole CoverlLid Covedlid not in place Covedlid is missing or only partially in place. CoverAid protects opening to Any opa�aVucture requires u�geM sUucture. maintenanco. Lodcing mechanism Mechanism cannot be opened by one Mechanism opens with proper tools. Not Waking maintenance person with proper tools.Bolts cannot be seated. Self-locking coverRid does not , worlc. ' Covedlid difficult to One maintenanoe person cannot remove CoverAid can be removed and Remove coverAid after appying 80 Ibs.of lift. reinstalled by one maintenance person. � , � I/9/2009 2009 Surface Water Design Manual—Appendix A A-10 APPEiYDlX A V1A[NTENANCE REQUIREMENTS FOR FLOW CONTROL,CONVEYANCE,AND WQ FACILITIES ,. NO. 6-CONVEYANCE PIPES AND DITCHES '� MaiMenaneo Defect or Problem Conditlons When Maintenance is Needed Resutts Expected When Componertt MalrMenance is Performed Pipes Sediment 8 debris Accumulated sediment or debris that exceeds Water flows freely through pipes. accumulation 20%of the diameter of the pipe. Vegetation/roots VegetatioNroots that reduce free movement of Water flows freely through pipes. water through pipes. Contaminants and Any evidence of cbntaminants or pollutian such Matenals removed and disposed of pollution as oil,gasoline,concrete slurries or paiM. according to applicable regulations. Source oontrol BMPs implemented if appropriate. No contaminants present other than a surface oil film. Damage to protective Protedive coating is damaged;rust or corrosion Pipe repaired or replaced. coating or corrosion is weakening the sLvctural integnty of any part of PiPe• Damaged Any dent that decreases the cross section area of Pipe repaired or replaced. pipe by more than 20%or is detertnined to have weakened strudural integriry of the pipe. Oitches Trash and debris Trash and debris exceeds 1 cubicfoot per 1,000 Trash and debris deared from square feet of ditch and slopes. ditches. Sediment Accumulated sedimerrt that exceeds 2096 of the Ditch deanedlflushed of all sediment accumulation design depth. and debris so that it matches design. Noxious weeds My noxious or nuisance vegetation which may Noxious and nuisance vegetation constitute a hazard to County personnel or the removed according to applicable public. regulations. No danger of noxious vegetation where County personnel or the public mght normaly be. Contaminants and My evidence of contaminants or pollution such Materials removed and disposed of LL� pollution as al,gasoline,concrete slurries or paint. aocording to applicable regulations. Source oontrol BMPs implemented if appropriate. No contaminants present other than a suAace oil film. Vegetation Vegetation that reduces free movement of water Water flows freely through ditches. through ditches. Erosion damage to My erosion observed on a ditch slope. Slopes are not eroding. slopes Rodc lining out of One layer or lesa of rodc exists above native sal Replaoe rocks to design standards. place or missir►g(If area 5 square feet or more,any exposed native li ApPlicable) soil. I � 2009 Surface Water Design Manual—Appendix A I/9/2009 � A-I1 C.2.2 FULL INFILTRATION I FIGURE C.2.2.A TYPICAL TRENCH INFILTRATION SYSTEM I ,�_� I j �—roof � � ; drain PLAN VIEW � ' NTS — 4"ripid or s"flexible ' % pertorated pipe -----------------------------------------�. l � , � , infiltra?ion trench �sump wtsolid lid PLAN VIEW roof drain NTS overflow 4"rigid or 6"flexible splash block� � '-perforated pipe \�� 6„ �i;�i��i;�i>ii; /, -•-i��i,�i;��i��>:�i��%�i�i��i� ��`��` 6„ :c�o C •-----1----•------•- V y� � washed rock � 4o q a°� ^ ��m�n 5.0'min 12"I � ' �— 1 1/2"-3/4" " `� =-i� o °� 1'min L— � ----------�-'�-°--'^-4�n�'� � �-------- --------- � f�in oo esh CB sump w/solid lid varies A filter fabric —� , . compacted backfill �� 6° � � i � � : 4"rigid or 6"flexible � ° � ° �Q� perforated pipe 24" °7 0 "� • � o �D o I i � ��° �� washed rock I12" >� � �� t � 4°n o oC c ��II 1 1/2"-3/4" �_-i Q '�� ° C ?�\��\��\�'\�\�'� <�%��%�>%��%��/.\�� 24'� SECTION A NTS 2009 Surface Water Design Manual-Appendix C li9r'2009 G�5 SECTION C.2 FLOW CONTROL BMPs I FIGURE C.2.2.B ALTERNATIVE TRENCH INFILTRATION SYSTEM I �from roof grass 6" min �verflow � ��j\�i\�j/� / ��2��-3�4" a Q °9°�p° washed rock % a D n oo o � NOTE: Same length dimensions 18" min ; =9 �o�°ov° and site limitations as typical system �4 � 0 poo° � °aDo �� p° a � 2' min � 15' min X-SECTION NTS filter strip grass I 5' min overflow �6" min r drivewaY �— -� , �� /i��" 0 0°° �' � 1�12"-3/a" a a DQ° ° � washed rock i� �° � °o°° NOTE: Same length dimensions �; a,�Q�Qp O v 18" min and site limitations as typical system v �o o � �Dao po a °04 o v° p° o � 2' min � X-SECTION NTS I/9/2009 2009 Surface VVater Design Manual—Appendix C C-46