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Home My WebLink About03122 - Technical Information Report - Drainage � JAEC ER �NC II�IEERI�IC � 9419 S. 204 PI.ACE - KE[r7', WASHINGTON J803 1 PHONE (253) 850-0934 F,vc (253) 850-0155 N N � m June 12, 2003 DRAINAGE REPORT OYLER SH4RT PLAT 3 LOTS 2517 ABERDEEN AVE. NE RENTON, WA. PREPARED FOR: Jim Jacques 2509 Aberdeen Ave. NE Renton, WA. 98056 (206) 609-7687 �:,� __�� . PREPARED BY: . .�;, �Y,'�° �:�•f �„� James J. Jaeger, P.E. ' � - � . � . 1 { � . ' y �1 ,��'��„��. ��' �.,� s. . �, (� �ar!'":.' `..3��t �I .?.ryF:.:.. , . � � � � . - � � � �:.�..�......�,�:-;.:, � ..�._._,.... ">., ?�oc�_ 3 �,2,2 .� � TABLE OF CONTENTS Paqe I. Project Overview II. Core Drainage Requirements Iil. Off-Site Analysis IV. Pre-developed Drainage V. Developed Drainage VI. Conveyance System VII. Speciol Reporfs and Studies Vlll. Basin and Community Planning Areas IX. Other Permits X. Erosion Control Analysis and Design � �I i ,I I l . OVERVIEW The proposed project is a 3 lot shorf plat located along the west side of Aberdeen Ave. NE. The site address is 2517 Aberdeen Ave. NE. The properfy has an existing house, attached garage, large porch and several large trees in the rear of #he property. The existing lot has o total area of 17132 SF, or 0.39 acres. The site is currently zoned R-8. The proposed shorf plat would divide the existing lot into 3 new single family, detached residential lots. The existing site is generally covered with grass and the several large trees. The tree plan is shown on the erosion control plan. The site is fairly open without a heavy underbrush cover. The lot hos an average slope of approx. 30% down from the west to the east in the rear (west) portion of the site. The center and east parf of the properfy is fairfy flat with a very slight slope down to the east, towards Aberdeen Ave. NE. The east property line is the lowest with the norfheast property corner as the lowest point on the property. The site has been s�rveyed and the topography is shown on the engineering plan set. The existing frontage along Aberdeen Ave. NE is an asphalt paved road that has marked fog lines at the lane edges. The shoulder consists of asphalt and grave{. There are no curb, gutter or sidewalk improvements along this section Aberdeen Ave. NE. This property has been granted a waiver not to install curb, gutter ond sidewalks along the frontage of Aberdeen Ave. NE. Therefore, no frontage improvements are shown on the plans. There are no drainage facilities within this portion of Aberdeen Ave. NE. There is a short raised asphalt curb along the edge of the pavement. The runoff woufd flow to the north along Aberdeen Ave. NE. to a low area approx. 150' north of the site. The short plat wiH provide access to all three lots from a private road easement connected to Aberdeen Ave. NE. This easement will be 207' west of the ROW line and 26' wide, with a hammer- head turn-around. The private driveway access will be paved with asphalt. The majority of the private road wi11 be located on the adjacent parcel to the south, which is being developed as the Riley Shorf Plat. It will be jointly owned by Lot 2 and lot 3 and by call 4 lots of the Riley Shorf Plat. The proposed driveway and individual lots will drain into individual infiltration systems. The infiltration system for the private road will be located under the private road, within the easement. The new houses will utilize individual lot infiltration systems focated on the respective lots. The existing house on lot #1 will remain. New houses will be constructed on lots #2 and #3. Page t of 2 � King County Bullding and Land Development Divlston TECHNICAL INFORMATION REPORT (TIR) WORKSHEET • . . �• i� - . . .� � • 7 .I �»� � � F'I � • -� � ,�} ProjectOwner JIYY� �0.'� 'CS � ProjectName ��...r.�� SH�'�T rL� � Address 2Sd� A��+' � l,e- 1�3� Location i I Phone �� —��7 �� 0 Township Z3 , ' i Project Engineer �Ot-Y�'PS �d..2q1�-� Range Section ; Company � �-°�� (��,�-� Project Size D�3Q—� � � 'S� � �' """"' Upstream Drainage Basin Size U AC Address�hone i 2�3) �iSv- c�3d • q�o3� � • • �-u�i . . �• • �- �� I' � � DOF/G HPA � Shoreline Mar,agemer,t � 0 Su`a�1i��ision ; �Short SuSdivis�on � COE 40� � Roaey ' � Grading ' ' � pOE Dam Safety '��. Structura�Vaul!s � I i � Commercial i ; � FEAGA Floodplain � Other + �i Other � COE 1'Jetla�ds � H�� , �; .. i � � � � • • � . r. �� Ccmm;;n,.y CIT�( `�C � �� ; -- -------- � Draira�e E2sin --� s�L--L�_ . l,t�H s�-c i r.i��g o r.! M •�. � I � F.;ver — ----- -- Fi�c�,�!ai� ---- ----- ---- --- i i C� St eam _ —: tivetlands — --- -- - -- —---- I CI Critical SL eam Rezch �I Seeps/Springs ,� C Depress�onsiSK�a�es r� High Grcundwaler Tabte : C Lz�e -- -- Ground•.vater Recrarce .� _ C' S;eep Slopes —_ ___ Other � Lakesi�e,Erosion Haz�c , r ; N oN� i x.;;: _ �• � �.. ��. �' —�; �c '. ^_ c �- � Eres cnr-c?er,;i�J E'�s:.e'.'e':�:.��s �o�r��' _ 2%0.=__'_ �o% - -��r_ _ -- 3 F�'sfi ' -- ---- ---- ------- ---- -- Addit ona Shee's A?ta'c��..�� . + Page 2 ot � King County Buliding and Land Development Divlslon � TECHNICAL INFORMATION REPORT (TIR) WORKSHEET � � . - � i� �� . REFERENCE UMfTATl011-'SlTE CONSTRAINT } i 0 Ch.4-Downstream Anafysis ��C��c7 �Yl�.SZ I� 1Y1� ��Y�� U� � 0 � � � 2.� I IrY�I � � � 0 � Addition�Sheeis Attalched ; , x . -i��i� I I MINIt�1UM ESC REQUIREN1Eh'TS 111NiMUM ESC REQUtREMEHTS i j DURING CONSTRUCTION FOIlOWING CONSTRUCTlON I � Sedimentation Faalities ,�" S'�b+l¢e Exposed Surface � [� Stabilized Cons;ruction Entra�ce � Remove and Restore Tem�orary ESC Faulities ; Perimeter Runoff Control ! ! �" Clean and Remove All Silt and Debris �Ciearing and Grading Restnctions � Ensure Operation oi Permanern Fadiities I , � Cover PraC,ices � Flag Limits of NGPES � Consiruciion Sequence CJ Other ' � Other ' � �-i « �, � i._1 Grass LineC Cha.�rel TanK �nf�!;ra,icn fd�e�oC of Ana!ysis � Pipe System � Vault C1 Depression Sg� 0 O�en Channel ! Enercy D;ss�x:or � Flow Dispers2l Ccm�ensation;T.lit�caticn ! � Dry Pond �J 1'�etland L� 1'Jaiver of EliminN�S�'e Storage � � 1h'et Pond �J Stream 0 Regional De�ention Brief Descr:p;ion c`System Opera;ion �(,�►�(( e.� �� 11(1T1 ��Yp�l QY� � , �� 1 Y1 �fi Y a-i�iN� �r c i^�tl O.�e I�OO�-� i Facility Related Ste Limi;ations � f� Addi;ional Shee;s At;a;ched Feference Fac�li,y L�:;a,icn i I - _ - - --_. �� 11 � li'= _� 1 _ � 'I "1 ��1 I . � � �Drainage E�sement � Cast in Place V�ult � Other i ' �'Access Easement � Retaining 4'ti�a!i �l Native Grcwlh Protection E�semert L�. Rockery>4'H y� ' � Tract � StruClural on S'c�p S!o�e � � � O"��er � i• .� �. -�-.:�. r�� - - ':��'. �;1;:" � I or a eivii engineer under my supervision have visi;ed t�.e s:te. :.c;.;�l j site condilions as cbserved were incorporated in;o this woricsheet and ;he � � ariatchments. 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I �T f�I /1� 1„�\ (C) CNfU'Af(� �d R � i��/J��ieu��M� f�; i c ../ k I !�l wusuntn , I cR�l IIIC .;(;�I,i�; I I_y , � i �`�� m �;� �I,, - ,a� oa m I , I I I I ( IN FF.Et ) I I IIICh a :fO II. �I � I� � ea' J JO' � ee�.u'es'(rl ,l'F. °•/%%/ .5•�• YJ'Db�JJ"(Y) (flR�cMa�w��r r�cH�r.v� � ti / I �s�• ionrii .S�i�� ,�,,,m„u:,�,�,� w�, � �l__1�w[m. i��K 11K IK �/�a'sre s-ai-s _ - ------u�.n'!�i - - ' . _._. --- i�eyvo�i�r �� /� �� nns�nronY � �` ---�- - �m�rie'�o`r'- �`- ��J�� r _"_ /\___ _,n-6964'IMl 65J15�u�`. ` (1II�M C�.0 P/N PUI v V � 1 (w St�r+ti(I I�HIS I � C i/.ro.. nr stc e-r�-s �' ' . . . �nr or weNrou cao�nx '� �1.. ..-�.... .,...��l:`1 a�•i.t:a :;iiotz�r r�.nT ,,,��,.,�.,,.,�9 .; ��, r,��_ ,.ir v rrtr w..Vn ee f�- c] rr�nur a��x. unt�,v�n �. ��y�' �7 vra e6.vr, es � � •�.� . �,.�.. ��a s' ��y i9 �, ,J, ' . ,. ,.,., ,,.� i: uM� n. o�n �w r�u )••�.�.•'�S' I� ru« oi-�._n� JkJCO-PI.DWf, "u��..�°� � ,.�,.� �� ,�,�i •� TIIA'f f'OItTIoN ot' 'riit: _N14 ii,� NI•�..�i.i. r;F:t"19(lN _...1j:i ��uWNtiHlI' --�:4. N, IfANCF: __��r, . �3 ..�u i _ F., W.A1. �, i.�xs �irriu� � i,�.': �-.�o' t �,r � .iiuuiin.•niun.�11 � � II. CORE DRAINAGE REQUIREMENTS 1. Discharge at Natural Location: The existing site runoff is to the east, towards Aberdeen Ave. NE. However the soils within the property are very sandy and extremely pervious. The sheet flow across the site infiltrates into the soi! within the flat area prior to leaving the properfy. The proposed drainage system will use infiltration. As such, the existing discharge location is not changing. 2. Off-Site Analysis: � A downstream drainage analysis is not necessary becavse the developed site drainage will utilize 100%infiltration. 3. Runoff Control: This project is exempt from peak rate runoff control because the 100 year peak developed runoff is less than the limit of 0.5 CFS greater than the peak pre-developed runotf rate. The actva! difference is 0.16 CFS. 4. Conveyance System: There are no existing drainage improvements on the site. There also are no drainage improvements within the frontage road near the site. As such, the proposed short plat does not show any conveyance system, other thon the new driveway gutters. The new houses will utilize individual lot infiltra#ion systems. 5. Erosion and Sedimentation Control Plan: An erosion control plan has been prepared for this site. Grading activities will not be required except for the building foundation for Lot #3. Silt fencing, catch basin protection, soil cover ond dust control will be parf of the erosion control measures. 6. Maintenance and Operation: The maintenance of the private driveway will be joint responsibility of the homeowners on an equal basis. The mutual agreement will be recorded on the final short plat. 7. Bonds and Liability: Any required bonds and insurance will be provided pr� construction activities. SPECIAL DRAINAGE REQUIREMENTS There are 12 special drainage requirements that may apply to ar nr��P�t !n thic �ncP n�nP nf +hPm n�� n,-,r,�irr±h!P tn fhie r,rniP�' � REPORT Clty of Renton Deparment o1 Planning!Building/Publlc 6'l'orks 8c DECIS/ON ADMINISTRATlVE SHORT PLAT REPORT & DEC/SION A. I SUMMARY AlVD PURPOSE OF REQUEST: _ , F,EPORT DATE: F�larch fi, 2002 Proiect h'ame Oyler Short Plat _' Applicant Jim Jacques � FiJe Nu.mber LUA-02-017, SHPL-A Project Manaoar Jason E. Jordan I i Fro;ect Description Administra;ive Land Use Aciion (ShoR Plat Revie�ti�) for the three-lot subdivision of a 0.�9- � I� acre site located in the Residential–S D�ti�elling Unit Per Acre (R-8) Zone. The subject si�e is currently oeveloped v,�i;h an existing singie tamily structure, v,�hich is proposed to remain on �a�hat�vou�d become ne�v Lot 1. Lots 2 2nd 3 are intended for the future construction of single-!amity residences. i Prcfect Location 2517 F�berdeen Avenue NE _ -.. - - .i:� Y:'T � '�' '�:. ---–-� � . :� .. . �.�• .� :-;c'- ' .�,�a ��r_� _ - :; -� 4 �`�=•i,' E� �1. �� (� �_ _ ' �` � '.�--,--�.�^ � - — r•-��-��'ti-�� aF..�� - .. % �T _. r _ .i 'i'' : � :`. �'J r�+ �E,^ '�� " �,��c_ w,��p A._�...... ..�0� : X`3 � ( �.. t i � I • - , b i �E' ' "' . {J. �. � .r.- - - G � I ��i �. _;�_ `_�s.. � � }_� - h I F r _, _ _, _. �.r� . �_ — N _V. ^ �:` � �_,_,. � ��=.��.� - `z'—v -- z� r , , .4'1'_: - .� ti -` -_ 5 T—\ _ I � _ � .. ._� — -- � ` .� _.. . � �,p'� r`� ,\ � 277 —� L-.+ ' _�r: � .r� ��..F ,� � � ` t f �_ —T_ �� - � 2ic � t ��lE . -256� �.] �-� f • � M� j'� � 1'_.._.. ;-v ' f _'Y.! . .�;5�-- „ i F�ei. r•� , I ' � " �-t 1� If` � `' �.::�� ".�. � `i-. .. , . ..'� � 1��. ��' �' I ' . . -T'.ti�r -�'w��/'W'ac`, �<L•� . �ei• ::3G �i3 ni ` `s 2Q( �; I L �~ ��7+? :- i Y `4� � �•�. �� -� z s �Su�S,EY � �t�_ " � � C � .; �"-? (�] =5 _ •:Wt 1 I ' �"=2 - a I � _ � � -�:,;,�:�, - =-�-~ e'.r_1, - �'"� �00�� :� . l� � .s .�ti4. ��F.:• _ � I � .�� ; . .�� `:`�. �': Q . � � . ,4 ��' ._ P,' ' ' - � ` � y „ �� t= + 'zE'��LLS� � o�.i '�i I ` � ��:-0r�. ..(.Q �— �`" _ � �_�`J , ' ` ;��i.—J` Y � E.� b�.�'" �' `'`sk�%`�'E�.` ��r u£ c 7a w 5T � ,. _ � �� T� , ,✓ � ! `tl . -��-f"7'S -. ��,' ut; ��e0. �i Y"y��o-'�`.."�' �� L . ¢ � . �r3 2a2y E .-. ,(�E[ �f.-. � I ` `�` "}(� ! iJe " � .�' ��`F-f ', `�--Q n_� � >RJjV� .�,�r�'c �i ... ._� ' c3v..r�-.�,ti .�E -1 ��-��.. J t'"� aAE 2jFD S .�o _ _ _ _ ..�J�'� C i:a � Ft 'A c Y�� J �I� �� r�i 1 � ,.� �f�f � c,,.r.� �� aC!' SL�v� . !.� �_ . ��_ I. E � ` _ )`I_ —� -,;�o; r-. -,: `r.= � �:_ . �:� . ' � � ��.e rF� �-� ' - . � _,�. ��. � -�^F:-� F;c�ec:Locaticn !.'zp - - . - _ City oi Renton P/B!P�Y Department Administrative Lantl Use Act�on REPORT AND DECISION DATED A7arch 6,2�02; PROJECT LUA-02-017. SHPL-A Page 2 � B. GENERAL INFORMATION: 1. Owners of Record: Jim Jacques 2509 Aberdeen Avenue NE Renton, WA 98056 2. Zoning Designalion: Residential—8 du.ac (R-8) 3. Comprehensive Plan Land Use Designation: Residential Single Family(RSF) --' 4. Existing Site Use: The site is curre�tly developed with an existing 1,264 square foot single`�mily residence proposed to remain on what�vouid become new Lot 1. All other existing structures �vould be removed or demolished as part oi this applic�tion. 5. Neighborhood Characteristics: North: Single Family Residential (R-S zone) East: Sing�e Family Residential �R-8 zone) South: Single Family Residential (R-8 Zone) West: Singie Family Residen;ial (R-8 zone) 6. Access: Lot 1 �vould have street frontage on Aberdeen Avenue NE and wouid be sen�ed from that street. Lots 2 and 3 would be accessed from a shared 20- foot wide priv2te easement located south of the subject site accessing o`f of Aberdeen Avenue h�E. The proposed 26-toot wide private easement w2s created as part of the Riley Short Plat (LUA02-002, SHPL-A). 7. Sife Area: 17.132 scua�e teet,'0.39 acre C. HISTORlCAUBACKGROUND: Action L2nd Use File No. Ordin2nce No. D2te Comprehensive Plan N;'A 4�98 2'20;1 oc� Zoning N.'A 4G04 6�7/190? Arnex2tion N;'A 1827 5!31196� Riley Lot Line Adjustment LUA02-001 NiA Pencirc Riley Short Piat LUA02-002 N`A Apprc�,�ed 2'8 2Q�2 D. PUBLlC SERVICES: 1. Utilities 1'Vater. There �� ex:sting 16-inch dia-re:er�:2;er main in Aberdeen Avenue NE. Sewer: There is an existing 8-inch ciame:er s2r:tary sev��er main in Aberdeen Avenue P�E. Surface Water/Storm Water: There is an existing 12-inch storm pipe in Abereeen Aven�e �vE. 2. Fire Protection: City of Renton Fire Dep�r;ment E. APPLICABLE SECTIONS OF THE RENTON MUNIC/PAL CODE: 1. Chapter 2 Land Use Districts Section 4-2-020: Purpose and Intent of Zoring Districts Section 4-2-070: Zoning Use Table Section 4-2-110: Residential Developrnent Standards 2. Chapter 4 Property Development Standards Section 4-4-030: Development Guidelines and Regulations 3. Chapter 6 Streets and Utility Standards Section 4-6-060: Street St�rdards 4. Chapter 7 Subdivision Regulaticns Section 4-7-080: Detailed Procedures tcr Subdivision Section 4-7-120: CorrpatiCility wiih Exi�t;ng Land Use 2�d Plan-Ger.eral Rec.;'-ements a-�d �� ..F,t.,.:., i C�ty o1 Remon P/B;'PW Deparlmenl Adminislrative Land Use Act�on • REPORT AND DECISION DATED March 6.2002; PROJECT LUA-02-017,SMPL-A Page 3 ��inimum Standards � Section 4-7-150: Stree!s-General Requirements and Minimum Standards Section 4-7-170: Residential Lots-General Requirements and ��4inimum Standards 5. Chapter 9 Procedures and Review Criteria F. APPL/CABCE SECTIONS OF THE COMPREHENSIVE PLAN: 1. Land Use Element— Residential Single Family _- 2. Housing Element G. DEPARTMENT ANALYSIS: 1. Project Description/Background The applicant, Jim Jacques, h2s proposed to subdivide a 0.39-acre parcel into three Iots. Currently, the subject site is 0.46 acres. However, in addition to the 3-lot short plat request, the applicant is also per(orming a separate lot line adjustment to shift the southern property boundary approximately 13 ieet to the north, v:hich �vould reduce the subject site to 0.39-acres. The lot line adjustment would be completed prior to the tinal short plat recording. The property is currently develo�ed with an existing single family residential structure, ��:hich is proposed to remain on �vhat would become new Lot 1. All other existing outbuildings are proposed to be removed or demolished as part of this application. Lots 2 and 3 are intended for the eventual de�-elopment of detached single tamily homes. The lots are proposed at the tollowings sizes: �,476 square feet (Lot 1), 5,584 square teet (Lot 2), and o,072 square feet (Lot 3). The appiicant is proposing to serve three lots to the south along with Lots 2 and 3 ��,ith 2 26-ioot �vide private access e2sement, which is 3,644 square leet in size. The majority oi the 26-toot �vide private e2sement is located on the properties to the south; hov.�ever 420 square feet is loc2ted ��ithin the subject site. Theretore, the net site area o1 the proposal (site area minus priv�te drives serving more ;h�n 3 iots) is i6,646 square feet (17,132 — 420 = 16,712 square feet or 0.38 acre). This in ,u-n, eG�a;es :c a ret density of 7.9 ��velling units per acre (3;0.38 = 7.9du.'ac}, which is under the maximum (9.7) allo�:�ed ��;tr�n the �-8 zone. Lot 1 abuts Aberdeen Avenue NE and ��ould be prot�ided direct access from that street. A shared 26•lcot ��;ice I private street (driveway) easement located on the sou;h side of the development is being proposed to p�o��ide � access to Lots 2 and 3. Lot 2 and 3 would be ser��ed from that 26-foot wide private access e2semer.t as �:�ell ' as future lots iocated directly south ot this development. The private street easement wouid have drect access � to Aberdeen Avenue NE. I The topography of the subject site is generally 112t, tivith a gradual slope from east to ��est mainly on �a�h2t ��rou�d , become ne�v Lot 3. The subiect site is predomin2lelv vegetated �vith arass lawn and 14 coniferous trees, v:hich ��;ould be removed as p2rt of this application. �Jo critical 2reas were `ound at the subject site during the rev�e�,v of this application. 2. Environmental Review Except when located on lands covered by �ti-ater or sensitive areas, short pla;s are exempt irom SEPA Environmental Revie�v pursuant to 1NAC 197-11-800(6)(a). 3. Compliance with ERC Conditions , N%A ' � 4. Staff Review Comments �' Representatives irom various city departments h2ve reviewed the application materiais to iden;ify and address issues raised by the proposed developmer.t. These comments are cont2ined in the official tile, and the I essence of the comments has been incorporated into the appropriate sections of this report 2nd the Departmental Recommenda;ion at the end of ;he report. I s!:p;1•pt.dOt I I � _ City oi Renton P%B-PtiY Departmenf Atlministrafive Land Use Act�on REPORT AND DECISION DATED A7arch 6,2002; PROJECT LUA-02-017,SHPL-A Page J - 5. Consistency Short Plat Criteria Approv2l oi a plat is based upon several factors. The tollowing short plat criteria have been established to assist decision-makers in the review o1 the pl�t: a) Compliance with the Comprehensive Plan Designation The site is designated Residential Single Family (RSF) on the Comprehensive Plan Land Use t�-1ap. The RSF designation is intended to promote and enhance single family neighborhoods. The proposal is consistent with the RSF designation in that it would allow for the tuture construction ot new single tamily homes, thereby promoting goats of inlill development. The proposal is consistent v�ith the ioliowing Comprehensive Ptan Land Use and Housing Element policies: Policy LU-36. Allowab/e developmenis at 9.7 dwelling unris per acre on infill parcels of one ac�e or less as an incentive to encourage single family smal!loi development. The net density of the proposed subdivision, 7.9 dwelling units per acre, is within the density ranoe prescribed. Policy H-4. Encouraoe infill development as a means ro increase capacity. The proposal would create two additional lots, thereby increasing density�vithin a currently developed residential area. b) Compliance wifh the Underlying Zoning Designation i he subject site is designated Res�den!ial — 8 Dwelling Uni;s per Acre (R-8) on the City of Ren;on Zoning P�1�p. The proposed development woutd allow 1or the future construction ot up to t��;o ne�v single family dvreiling units. The allowed density range in the R-8 zone is a minimum ot 5.0 to a m2ximum of 9.7 dwellir�g ur�;s per acre!or lo:s one-half an acre or less in net size. Net density is c2lculated after ihe deduction of sensitive areas, 2;e2s intended `or Fubtic right-of-�vay, and private easements serving 3 lots c- mo�e from the gross �creage oi the si;e. The propeRy does not cortain 2ny ser,sitive 2,e2s n�� areas required for right-ot-��2y dedication. Ho�vever, the proposal does intend to ha��E a 3,6=�� square foot priv2te street sen�ing 3 lots or more. The m2jority oi the 26-foot �vide pri��e , e2sement is located on the propert es to :he south; ho��ever, 420 square ieet of the pri��a'e s;re�! I, is located within the subject site. Tnere`ore, the net site area of the proposal (site area mir,.s private drives sen�ing more than 3 lots) is 16,646 square ieet (17,132 — 420 = 16,712 square `EEt ', or 0.38 acre). This in ;urn, equates to a net density of 7.9 dv,elling units per acre (3 / 0.�3 = ' G , du.'ac), which is under the maximum (9.7) allo��ed within the R-8 zone. � The density calculati�n is based on an 2pproved lot line adjustment that is currently pend�ng City , Approv2l. Specific2l!y, the applicant has submitted 2n application to move the southern propErty boundary 2ppfOX!f?12'ely 13 feet to the north, which was required to create enough gross property square toot2ge for a separa?e short p:at located directly south oi the subject site. Therefore, st�ff recommends a condition be placed on the Oyler short plat application requiring the Riley Lot Line Adjustment (file �LUA02-001, LLA) to be completed and recorded prior to final recording of the , Short plat. The allowed building lot coverage in the R-8 zone is 35 percent or 2,500 square feet whichever is greater for lots over 5,000 square 'eet in size and, lots 5,000 square feet or less 2re 211ovred to have up to 50°�o Iot coverage. Lot 1, with the existing residential structure, �vould have a lot coverage of approximately 23°o after the short plat, which is�vithin the allo�ved range. Setbacks in the R-8 zone are zs iollo�a�s: front yard 20 feet, side yard 5 teet, side yard a�ong a street 15 feet, and rezr yard 20 teet. Upon recording of the short p1at, the existing single fami!y structure on Lot 1 would meet the minimum required setbacks as es?Gblished by code. VJhile no construction is pl�nned for Lots 2 2nd 3 at this time, the lots appear to h2ve 2dequate �rea to provide for a nevr single family residence �vhile meeting ;he required setbacks and lot coverage. In addition, e�ch Ict vrould have �dequa;e area to provide two off-street parking spaces as required by the parking regulations. Hovrever, all outbuildings not located on �,�hat v✓ould become nevr Lot 1 v,�ould need to be demolished or removed in order to locate homes on the proposed Icfs. Therefore, s:atf recemmends �hat a condition be placed on the short requiring the 2ppl;cant te s�a�,, �:%c , City o1 Renton PiB.'PW Department Adminisirat�ve Land Use Act�on REPORT AND DECISION DATED t�larch 6,2002; PROJECT LUA-02-017,SHPL-A Page 5 - obtain and compete all necessary demol�tion permits and inspections prior to t�nal short plat recording. c) Compliance with Subdivision Regulations Streets: No new public streets would be created as part o1 ;he proposed short plat. Rt�1C section 4-7-150.F of the Subdivision Regulations requires the installation of full street improvements, including curb, gu�er, 6-foot sidewalk, and hali-street pavement along the si;e's i,berdeen Avenue NE street lrontage pursuant to City of Renton Street Standards (RA4C section 4- 6-060), unless waived or deterred through the City ot Aenton Board ot Public lNorks. On November 15, 2001 the City of Renton Board of Public Works deferred the required street improvements. �, The proposed subdivision is anticipated to generate add�iional traffic on the City's street system. In ', order to mitigate transportation impacts, staff recommends a condition of approval be placed on �I the project requiring a Transportation tJlitigation Fee based on �75.00 per net new average daily trip attributed to the proj2ct. The addi;ioral lots are expec;ed to ge�erata approximately 9.57 ne�.v average weekday trips per lot with credit given ior the existing single famify residence. The fee for the proposed short plat is estimated at S1,435.50 (S75.00 x 9.57 trips x 2 = S1,435.50) and is pa��Gble prior to the recording o1 the short pi2t. Blocks: No new blocks will be created�s part ot the proposed short piat. Lots: The minimum lot size permitted in the R-8 zone is 4,500 square teet. The proposed piat vrould create three lo?s, which are proposed at 5,476 square teet (Lot 1), 5,584 square teet (Lct 2), and 6,072 square ieet (Lot 3) in size. The proposed lot szes are co�-,p�tib�e �,vi:h c;her exis�ing lots in this area under the same R-8 zoning classification. The proposed lots also comply�vith ,he R-8 requirements 'cr minlrr;;m Iot ��,i�:n to0 teet 'cr c��er Io;s and 50 feet for imerior lots) as ��ell as minimum lot oepth (05,eet). The residence pror�;_- ._ �emain on Lot 1 mee!s the required setb�cks and lot coverage permitted in the R-8 zone. Ir addition, proposed Lo',s 2 and 3 (i�!erier !c',sl zppear to ha�.�e adeouate tiuii�irq area ior the construction c consideratior The size, sh�: Of th@ SUbC�IVISiOfi 1=ti@C�:;�aLOf.S c'10 �r�@ Cc��B10�f71E'l� Sicf.CcfCS Gf :�'iB f�-� �G��E. ifi cOCii;O�,, EcC"'� lot evould have access to a public street (Aberdeen Avenue NE). d) Reasonableness of Proposed Boundaries Access: Each lot v,�ould have the folio�ving direct access to a public right-of-v,�ay: • �ot 1 direct street access irom Aberdeen Avenue NE; and, • Lots 2 and 3 from a shared 26-ioot tivide private street easement onto Aberdeen Avenue �'E. The private street would be located o��er portions of Lots 1 and the southem property�butting the subject site. A 26-foot wide priv2te street may be permitted for access up to 6 lots, 4 of which do rot abut a public right-of-way. In addition, an emer5ency access hammerhead turnaround �vould be located over portions of Lots 2 and 3 and vrould be a continuous drive �vith the proposed 26-foot wide private street. In order to establish use rights for emergency access turnaround and a small portion of the 26-foot wide private street, sta'i recommends that the applicant be required to dr�ft and record an easement with the property to the south. The easement language wouid need to establish permission to construct, maint2in 2nd use the 26-foot �vide private street and emergency access hammerhead turnaround�a�ith the property directly south of the subject site. The s2tisfaction of this requirernent vdould be subject io the revie�v and approval of the Developmer,t Services Division prior to the recordirg ef the short p121. Staff also recommends that the hammerhead turnaround be signed for"No Parking"along boih sides of the drive. Finally, sta�f recommends a condition oi project approval requiring the applicant to provide a private stree; si�n at the interseclion of the 26•foot ��,�ide priv2te ro2d and Aberdeen Avenue NE, which v,�ould list a!I home addresses being served by the priv�te street. This condition �vould insure emergency access vehicles v,rould be 2ble to locate tFe homes sen�ed by the private drive, in the event ot �n emergency. _ � CJ:: City of Renton P/B/PW Department Administrative Land Use Act�on REPORT AND DECISION DATED March 6.2002; PROJECT LUA-02-017,SHPL-A Page 6 Topography:The topography of the site gently s�opes to the east, except tor the steeper portions ot �vhat wouid be become new Lot 3. As proposed, Lot 3 would have siopes that exceed 25°o in slope; theretore, stafi recommends a condition of project approval requiring the applicant to provide a Geotechnical Feport ior Lot 3 at the time of building permit submittal. The property is vegetated with grass 12wn and several coniierous trees. The development ot the site tivould require the removal of severat trees located mainly on what tivould become Lot 3 for a single-tamily residence. Potential erosion impacts may occur during project construction; thereiore, siaft recommends a condition of project appro��al requiring the applicani to install a temporary erosion control system to the satisfaction oi the Development Services representative tor the duration oi project. This tivould ensure no additional stormwaier erosion impacts �vould be generated from the pro�osal. The Temporary Erosion and Sedimentation Control Plan (TESCP) should be developed pursuant to the 1990 King County Surface Water Design Manual (KCSWDM) prior to issuance of Construction Permits. Relafionship to Existing Uses:The properiies surrounding the subject site are designated Residential—8 DweUing Units Per Acre (R-8) on the City's zoning map. The proposal is similar to existing development patterns in the area and is consistent with the Comprehensive Plan and Zoning Code, which encouraoe residential iniiil development. e) Availability and lmpact on Public Services(Timeliness) Police and Fire: Police and Fire Prevention staff indicate that sufficient resources exist to iurnish services to the proposed deveiopment, subject to the condition that the 2pplicant provide Code required improvements and fees. A Fire Mitigation Fee, based on 5488.00 per new single f2mily lot with credit given for the existing single !amily residence, is recommended in order to mi;ioate the proposal's potenti2l impacts to City emergency services. The fee is estim�ted �t S9i6.00 (5488 x 2 = S976.00) 2nd is pa��bie prior to the recording of the short plat. Recreation: The proposal does not provide on-site recreation areas tor future residents of :he proposed short plat. However, there 2re existing recreational iacilities in the 2rea such �s: Gene Coulon t�lemorial Park, Sunset Court Park, and Kennydale Lions Park th2t +uture residents �;�ould use. Theretore, in order to offset the aoditional use of these facilities, a P2rk F�4itigation Fee r,rould be required. Specifically, a Parks �,�i;ig2tion Fee of S5,:0.76 per new single fami!y is recomrrended prior to the recording oi the short plat. Credt ��ould be given for the existing single family residence. The tee is estimated �t S1.061.52 (S530.76 x 2 = S1,Q61.52) and is payabie prior to the recording of ihe short plat. Schools: According to the Dr�ft Environmental Impact Statement for the City of Renton Lsr�d Use Element (January 16, 1992), the City ci Renton has a student gener2tion iactor ot 0.44 stuoents per single tamily residentiai dweliing. Therefore, it is anticipated that the proposed short plat �tirould result in 0.88 (0.�4 X 2 = 0.�8) re�,�.� children to the loca! schoois !Kennyd2le Elementary School, ttircKnight P�liddle School, 2nd Hazen High School). The Renton Schooi District has indicated they can accommodate the zdditional 0.88 students generated by this proposal. Storm Water. A 12-inch storm �vater pipe is located in Aberdeen Avenue NE. A dr2inage report �vas submitted with the applicGtion and has been reviewed by the City of Renton's Plan Revie�v Section. A Surface Water System Development Charge of $525.00 per ne�v single family lot ��rould be collected 2s part of the construction permit or prior to the recording of the short plat. Water and Sanitary Sewer Utilities: There is an existing 16-inch vrater �nd 8-inch se�ti�er main located in Aberdeen Avenue NE. An 8-inch sewer main extension and side se�ver stubs are required to be installed �vithin the private street prior to final short plat recordino. In addi:ion, the applicant would be reouired io m2ke all other necessary connections to serve future development on Lois 2 and 3. A Wa�er System Development Charge of �1,105 per new single family lot, 2s v�el! as a Setiver System Development Charge of �760.00 per new single family lot, would be collected as part of the construction permit or prior to the recording of the short plat. H. Findings: H�ving reviev,�ed tr�e v,�ritten record in the matter, tre City no�v enters the iollo��ino: _ _ . c�c City ol Renlon P/B;PW Departmeni Adm�mstratrve Land Use Achon REPORT AND DECtS10N DATED March 6,2UO2: PROJECT LUA-02-017,ShiPL-A Page i _ 7. Request: The applicant h2s requested Adrninistrative Short Plat Approvai 1or ihe Oyler Short Plat, F�1e No. LUA-02-017, SHPL-A. 2. Application: The applicant's short ptat application complies with the requirements ior iniormation tor short piat review. The applicant's short plat plan and other project drawings are contained �vithin the official land use file. 3. Comprehensive P/an: The subject proposal is consistent �vith the Comprehensive Plan designations of the Singie Family Residential (SFR) land use designation. 4. Zoning: The proposal as presented, complies with the zoning requirements and development standards of the Residential Single Family- 8 (R-8) zoning designation, provided all advisory notes and conditions of approval are complied�a�ith. 5. Subdrvision Regulations: The proposal complies with the requirements established by the City's Subdivision Regulations. 6. Exisiing Land Uses: Land uses surrounding the subject site include: North Residentr2l Single Famrly (zoned R-8); Easi: Residentia/Single Family(zoned R-B); South: Residentia!Single Famrfy(zoned R-8); and West: Res;dentia/Single Family(zoned R-8). l. Conclusion: 1. The subject site is located in the Residential Single Family {RSF) comprehensive plan designation and complies with the goals and policies established with this designation. 2. The subject site is located in the Residential— 8 D�velling Units Per Acre zoning desigr�tion and complies ��ith the zoning and development standards established w-ith this designation. 3. The proposed three loi short plat complies with the subdivision regulations as established by city code and state Ia�v. 4. The proposed three lot short piat complies ��,Ith the s'reet stand2rds 2s estab!�shed by c,;y cooe. J. DEC/SION: The Oyler Short Plat, File No. LUA-02-017, SHPL-A, is �pprovEd subject �o :re fo''�o��:ing cond;c�,s: 1. The applicant shall pay the reeuired Transportation �Jli;igation Fee at the rate of S75.00 per net new aver2ge daily trip associated with the p�e;ec; (estim2ted at 51,4?5.50). The Tr2r,s�oration �:f itica;icn Fee s�Gll be �aic prior to the recording of the short plat. 2. The applicant shali pay the ree��irec Fire ��itica.ion Fee equal to 5�88.00 per rev✓ singie fam:'y Ie? est:mated a; S976.00. The Fire Mitigation Fee shall be paid prior to the recording of the short plat. 3. The applicant shall pay the required Parks F�litigation Fee equal to S530.76 per nev.� single i�mily �ot estimated at �1,061.52. The Parks Mitigation Fee shall be paid prior to the recording of the short plat. 4. The applicant shall obtain a demolition permit and complete ali necessary inspections 2nd approvais for the existing out-buildings not located within proposed Lot 1. The satisfaction of this requirement�vill be subject io the review and approval of the Development Services Division prior to the recording of the short plat. 5. The emergency access hammerheGd turnaround shall be signed tor"No Parking"along both sides oi the driveway. 6. The 2pplicant shall draft and record an easement v��ith the property;o the south, vrhich grants permission to construct and maintain a portion of the 26-toot tivide private street and specifies the rights to use the emergency 2ccess turnaround with the propeRies located directly south ot the subject site. In addition, the easement shail include language that specifies all maintenance responsibilities associated with the private street. The satis`action of this requirement ��rill be subject to,he review�nd approval oi the Deveiopment Services Divisicn prior to the recording of the short plat. 7. The Piley Lot Lir�e Ad;ust�ent ("�le -LUA02-OC1. LLA) shGll be cor��ple?ed ard �eccrded pr;er to fin21 short p'�t �ecording. - " �JC � C^y of Rentan P/6?PW Department Administrative Land Use Aci�on REPORT AND DECISION DATED March 6.2UO2; PROJECT LUA-02-017.SMP�-A Page 8 8. The applicant shall be required to provide the City oi Renton's Building Division a Geotechnical Report tor Lot 3 at the time of building permit submittal (this condition shail be noted on the iace oi the final short plat drawing prior ;o record�ng). 9. The applicant shall be required to develop a Temporary Erosion Control plan and inslall and maintain the plan to the satistaction of the Development Services Division 1or the duration of the project submittal (this condition shail be noted on the face of the iinal short plat drawing prior to recording). 10. The applicant shall be required to provide a private street sign at the intersection of the 26-ioot wide private road and Aberdeen Avenue NE, which shall list all home addresses being served by the private street. DATE OF DECISION ON LAND USE ACTION: h�arch 6, 2002 SIGNATURES: � . . , � ��!��/'.!� r� f�/�/��7!/��'%��". ..�,! 1 '��s� � \! / ' ' • . Gregg A. Zimmerman, P/BiPW Adminisirafor decision dafe . , ; �o� • City ot Renton P!B/PW Department Adm�mstrative Land Use Aciion REPORT AND DECtS10N OATED March 6.2002; PROJECT LUA-02-017.SHPL-A Page 9 ADVISORY NOTES TO APPLICANT The following notes are supplementa!information provided in conjuncfion with the administrafive land use action. Because these notes are provided as information only, ihey a�e noi subjecf to ihe appea!process for the land use aciions Planninq 1. The site is designated Residential Single Family in the Comprehensive Plan. 2. The property is zoned Residen;ial 8 (R-S). Densities ailov,ed in the R-8 Zone are 5.0 dwelling units per net acre (du/a) minimum and 9.7 du.`a maximum for lots '.z acre or less. 3. Minimum lot size in the R-8 Zone is 4500 si, with minimum width ot 50 ieet. The minimum permitted Jot depth is 65 ieet. 4. Heights of buildings in the R-8 Zone are limited to 2 stories, or 30 ieet. � �5. Required setbacks in the R-8 Zone are a 20-foot front yard, a 20-foot rear yard, a 15-foot side yard along a street and 5-ioot interior side as measured lrom the property line to the nearest point of the structure. Setback dimensions should be shown on the cor,struction drawinqs, but must be removed prior to recording the tinal short plat. 6. The maximum building coverage in the R-8 Zone is 35 percent or 2,5Q0 square feet which ever is greater for lots � over 5,000 sf and 50 percent Ic;s 5.�u�sf or less. I 7. RMC section 4-4-030.C.2 limits haul hours between 8:30 am to 3:30 pm, P�londay through Friday unless othenvise approved by the Development Services Division. The Development Services Division resen�es the right to rescind the approved extended haul hours at any time if complaints are received. 8. �Nithin thirty (30) d2ys oi completion of grading work, the applicant shall hydroseed or plant an appropriate ground cover over any portion of the site that is graded or cleared oi vegetation and �vhere no further construction work wiil occur within ninety(90) days. Atternative measures such as mulch, sodding, or plastic covering as specified in the � current King County Surface Water ttlanagement Design P,�anual as adopted by the City of Renton may be proposed bet�veen the dates oi November 1st and F�larch 31st of each year. The Development Services Division's ' 2pproval oi this work is required prior to fi�al inspection and approval of the permit. � �9. Commerciai, mutti-family, ne�v sing�e f2miiy and o;her nonresidential construction activi;ies sh211 be restricted to the � hours between seven o'clock (7:00) a.m. and eighi o'clock (8:00) p.m., tti�onday through Friday. 1Nork on S�turd2ys I shall be restricted to the hours betv,eEn nine o'clock (9:00) a.m. and eight o'clock (8:00) p.m. No work shall be i permitted on Sur.days. 10. DriveK�ay slopes are not atlowed to exceed 15°o in grade. All drive�ti�ay approaches over 8°o in grade are required to have slotted drains 2t the edoe ot the drive. PropertV Services -Comments tor Fin21 Sho� P12t Submitt2l 1. P!ease reier to the attached memo`rem Sor,;a Fesser c�ted February 25, 2002. Ffre Prevention j 1. A fire hydrant�vith 1,000 GPM fire itotv is required ��ithin 300 teet of all new single f2mily structures. If the building i, square foot2ge exceeds 3,600 souare feet in area, the minimum tire flo�v increases to 1,500 GP��1 and requires tv;o ! hydrants within 300�eet of the structures. ' 2. Street addresses shall be visible irom a pu5lic street. 3. The shared private drive�vay shall be a ,;;inimum of 20 feet in �vidth and shall be paved subject to the City of Renton's Development Services Division. P12n Review- Drainaoe 1. The Surface Water System Developrnent Ch2rges of S52� per each ne�v lot 2pplies to this project. I� 2. Storm dr2inage and temporary erosion;'sediment�tion control plans must meet the 1990 King County Suri2ce � 1Nater Design Manual. I� 3. Temporary erosion control me2sures shall be maintained to the satisfaction of the representative of the Development Services Division tor�he dur2tion of the projecYs construction. I;P12n Review- Se�ti�er 1. This project is located in the Aqui`er Proteciion Area-Zone 2. 2. Sewer main extension will be required to serve the plat as vrell as side se��er connection to each ne�v lot. I 3. Side sewer connection fees area 2t S60/connection. �, 4. East Kennydale SAD (area) �001fi parcel ;272 (S485 x units + interest v.�ill be required). i) 5. Aberdeen Avenue SAD #0021 Parcel -28 (ZFF} S5,436.30 + interest will be required. ' 6. Sanitary Se�ver System Development Charges of S760 per each new lot are required for this project. The Development Charges are collected as p2rt of the construction permit prior to the recording of the short plat. Plan Review-Water 1. The si:e is loc2ted in the Aquifer Prc;ec;ion Area-Zone 2, and a fill source statement will be required. 2. Ne�v water m2in and or tire hydrants m�st meet the fire ilovr requirements and Fire CodesiRegulations per the Fire Depanment. 3. Water System Development Charges of S1,105.00 per each new lot �vill be required tor this project. The Developmert Charges are collecled �s part of the consiruction permit prior to the recording of the short plat. � II4. Ne+v tvater me'ers for domesiic ser:�ice s�zed to meet current UPC standards will be required. - r r� OJ� . City oi Renton P/B/P1Y Department Administrative Land Use Action REPORT AND DECISION DATED March 6.2002; PROJECT LUA-02-017,SHPL-A Page 10 ' Plan Review— Street Improvements I1. None. Plan Review— General 1. All required utility, grading, drainage and street improvements will require separate plan submittals prepared according to City of Renton dratting standards by a registered Civii Engineer. 2. A construction permit is required. When plans are complete three copies o1 the drawings, two copies of the drainage report, a construction estimate, application and appropriate iees shall be submitted to the sixth floor counter. 3. Permit application must include an itemized cost estimate for these improvements. The fee for review and inspection oi ihese improvements is 5°0 of the first �100,000 of the estimated construction costs; 4% of anything over S100,000 but less than 5200.000, and 3°0 of anything over 5200,000. Hali oi the fee must be paid upon , appiication for building and construction permits, and the remainder when the permits are issued. There may be � additional fees tor water service related expenses. Please review the Drafting Standards for additional information. � TRANSI✓11T7ED this 6rh day o(March,2002 to the owner,'applicant: Jim Jacques 2509 Aberdeen Avenue NE Renlon,WA 9805fi TRANSIvJlTTED rhrs 6rh oay o1 March,2002 to rhe contact: Jim Hans�n Hanson Consulting 17446 h4allard Cove Lane Mt. Vernon, �1�A�52�4 TRANSI'.4ITTED th;s 6�0'2y Ol�J2�Ch, �OC2 10��E `C11o�ti'i��g: Larry t.leckling, 6uildiny O`ticial L. Rude, Fire I.•1ars`�al heil W�tts, De+e�opT:e�t Se^:�es Di�e��cr Jennifer Henning Jzn Conklin C2rrie Olscn•C2.�s La++-rence J.11'sne^, C� -,,,..�e; South Cc.:n'��Jcu�r'al Land Use Acfion Appeals & Requests for Reconsiderafion The admin;strative iand use decision tivill becerne final if the decision is not appealed��•ithin 14 days ot the effective dale of oecision. An appeal of the decision must be filed�vithin the 14-day appeal period (RCVJ 43.21.C.075(3); 1NAC 197-11-680). RECONSIDERATION. �'Jithin 14 days ot the ettective date of the decision, any party may request lhat a decision on a short plat be reopened by the Administrator. The Administrator may modify his decision if material evidence not readily discoverable prior to the original decision is found or ii he finds there was misrepreseniation of fact. Atier review of the reconsideration request, if the Administrator finds insufficient evidence to amend the original decision,there will be no further extension of the appeal period. Any person wishing to take further action must file a tormal appeal within the tollowing appeal timeirame. APPEAL. This administrative land use decision will become tinal if not appealed in wriiing to the Hearing Examiner on or betore 5:00 PtJI on �Jlarch 20, 2001. Appeals to the Examiner are governed by City of Renion Municipal Code Section 4-8- 110. Additional information regarding the appeal process may be obtained irom the Renton City Clerk's Office, (425)430- 6510. Appeals must be filed in writing,together wilh the required S75.00 application tee, to: Hearing Examiner, City of Renton, 1055 South Grady Way, Renton, VJA 98055. EXPIRATION DATE: The Short Plat approval v;ill expire two (2) years from the date of approval. An extension may be requested pursuant to R��1C section 4-7-OSO.t�1. shp!;rpr_c'oc IV. PREDEVELOPED DRAINAGE There are no existing drainage improvements on the site. The site is currently developed with a single family residence. The drainage from the existing site currently infiltrates into the lawn orea in the rear ond front of the house. The soils care extremeiy uniform sand. The east properfy line is the low point of the property. This is a(ong the frontage with Aberdeen Ave. NE. There are numerous trees that are generally along the slope in the west (rear) portion of the site. There is a general ground cover of lawn and shrubs. The droinage calculations include the total site. The site is � 17132 SF. Also included is the area of the new private road within the , adjacent property to the south. This area is 4560 SF. A total project area of 21692 SF, or 0.50 acres was used as 1he project drainage area for fihe ccalculations. The existing drainage analysis was performed using the "Waterworks" ' hydrology soffware and its summary tables and chorts are attached for refierence. The methods outlined in the King County Surface Water Drainage Monual were used as guidelines. Following this page are the data sheets used for the computer input data. The computer summary sheets for peak flow and time of concentration calcufations ore also attached. Below is a brief description of the existing droinage characteristics: rme of concentration: 14.26 minutes 2 year peak flow: 0.03 CFS 10 year peak flow: 0.05 CFS 100 year peak flow: 0.11 CFS total area: 0.50 acres pervious area: 0.41 acres curve number: 65 impervious area: 0.09 acres curve number: 98 � � �l 1�1 � ,_, � �, �'� � < ��' - -� y . �� - � � � � � - � C�� j tti) �� .___ V� � O O -- .� J ,) � � OO �J , - } �� „ �i �� i� ��, � li a ;�� .. - ► (.L'a°a° 1� C'��'S-� E� �- � � � � lll _ �—{ . . � . , . ---- � 1 �Yl -- r�� l <-� ` C: � . �' � l f.l c_�-- Jaeger Engineering OYLER SHORT PLAT DRAINAGE CALCULATIONS PREDEVELOPED HYDROGRAPH SUMMARIES BAS IN SLTMMARY BASIN ID: A10 NAME: PREDEVELOPED, 10 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 .50 Acres BASEFLOWS : 0 . 00 cfs R.AINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 2 . 90 inches AREA. . : 0 .41 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 65 . 00 TIME OF CONC. . . . . : 14 . 26 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 . 20 AREA. . : 0 . 09 Acres CN. . . . . 98 . 00 TcReach - Sheet L: 250 .00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 0880 PEAK RATE : 0 . 05 cfs VOL: 0 . 04 Ac-ft TIME : 480 min --_�- --� -- . _.� _ . _:._.� . _..�_�-.-�L_ _ � , 1 = � _�..- SBUH METHODOLOGY � TOTAL AREA. . . . . . . : 0 . 50 Acres BASEFLOWS : 0 . 00 cfs 'i RAINFALL TYPE . . . . : TYPElA PERVIOUS AREA � PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0 . 41 ticres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 65 . 00 TIME OF CONC. . . . . : 14 .26 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0 . 09 Acr_s CN. . . . . 98 . 00 TcReach - Sheet L: 250 .00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 0880 i PEAK RATE : 0 . 11 cfs VOL: 0 . 06 Ac-ft TIME : 480 min i BASIN ID: A2 NAME: PREDEVELOPED, 2 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 .50 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE . . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 2 . 00 inches AREA. . : 0 . 41 Acres ' TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 65 . 00 TIME OF CONC. . . . . : 14 .26 min IMPERVIOUS AREA ', ABSTR.ACTION COEFF: 0 .20 AREA. . : 0 . 09 Acres '�, CN. . . . . 98 . 00 TcReach - Sheet L: 250 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 0880 PEAK R.ATE: 0 . 03 cfs VOL: 0 . 02 Ac-ft TIME: 480 min , � �-+Q��}.v�� aY�.,��.fJCa'.;� l " �� I ��,�,'� ��" / S a�'ynv,l U,1, �'� � ,=- �.1. �/�;' g - �-�,� _ �Is '�} � �� s,�a �.}. 1�a c�n �r,�a.�,� �v �. ' f�,��-�-.�� U k-.�O U ��-� J ; � �'�o;_. _�2 J,� ��2 � -��S i ('i '� t�� ' � `�,� , t- �� ' � � ��1� ;�c�L�a�rj� fvo� �o � vu1�.. � � . ��{ I� 'Q = b� ' 4 - �� 'C � ��,,:��y��.r � _ �, ;s�c�c)i n� ��:t;�1�� ,,�1 o m,c��Tvc�,f�,�) ._ � ''� �6 q ' O � -..; l�b8� _;j C.G C , _ �r ,,� ,�C , � o o� 'J �.� , � �� = a=x� � ;^��o� �� t � -;�% �� ; �Lc-�an��,�p � �>�-:��. � �� v� �o �.. � � � � � �b = ; s-�al;��►�-� v,t.��, �v�.�SvC� • Z �'�cz��j , � ` r'� ►c c��c...,!,O ��V 'S a. ;�,-a c' ��-�-�+�'' �.�-� �;� o�' j , . � , � �� ,�,�.� �'�� Y� � �. -�-� c�s ' O = _.� �b� 12 = �-f-�'-L ' � �s a�LS-� _ �L�)02 + ��.�� c�-�� : ra-�.��o� 1w�� v,� �o cZ► a.�o n��►d �Z �S Z � I L_I �.�a-�o -a�t�' - � ' 1 �,��o� �oL1 S I�a' i� � �,�C� al�. C�-�. ��p d ,k� , , , ��rr�,0.! 3 Vs� �CZ_'._�S .S � ��o �+. �°o� a n�� ' �� a-.xaD a S n+� -'' -�'o �-;- �, v�-.� 1 �c�r�p �t �S _ v� �o-� �'1�.�, v`c) �2 s�� -a-G �i � Cr� s v.ct� � �,-�� v,�� -V�' i `1 ��–�`V�Q v .��.0�'r'r —=.�� –J�c� ��' �-'4�S �� `Q File Basin Hydrograph Storage Discharge Level pool 3eee5eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ; eeeeeeeeee; ° ° SHEET FLOW CALCULATOR - INITIAL 300 FEET o ° 0 0 0 0 °DES°Mannings Sheet Flow. . . . . . 0 . 1500 0 ° °ARE°Flow Length (ft) . . . . . . . . : 250 . 00 °HOICES ° °R.AI°2 yr 24 hr rainfall (in) : 2 . 00 ° ° °TIM°Land Slope (ft/ft) . . . . . . : 0 . 0880 ° ° °TIM° COMPUTED TR.AVEL TIME (min) : 14 . 26 ° o oR.AIo TYPICAL MANNINGS VALUES FOR INITIAL 300 FT °A ° o�S o 0 0 °BAS°Smooth Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 011 ° ° °STO°Fallow Fields of Loose Soil Surface. . . . . . . . . . . . . . . 0 . 05 °y ° ° °Cultivated Soil with residue cover (s<=0 . 2 ft/ft) : 0 . 06 ° ° °PER°Cultivated Soil with residue cover (s>0 .2 ft/ft) . : 0 . 17 ° ° °ARE°Short prairie grass and lawns . . . . . . . . . . . . . . . . . . . . . 0 . 15 ° o °CN °Dense grasses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 24 ° o 0 oBennuda grass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 .41 � o 0 oRange (natural) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 . 13 0 0 °PEA°Woods or forest with light underbrush. . . . . . . . . . . . : 0 .40 ° ° °PEA°Woods or forest with dense underbrush. . . . . . . . . . . . : 0 . 80 ° ° °TOT° o 0 ° OF10Key: QUIT F5Key: CLEAR °ete ° ° Pgaeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeefit ° aeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee P(�� _ �r�(�(�c�� i T��E d� � t� ��fz��l �t� � I v. u�vC�ur�u vKrri�vrlv. The developed project will include the new joint driveway and the hammerhead turnaround that will eventually serve this short plat and the Riley Short Plot. The existing house on lot #1 wili remoin and two new houses will be constructed on lots #2 and #3. The remaining portion of the developed site will be residentiol tandscaping. The developed drainage will use individual lot infiltration for each of the houses. The site will be exempt from drainage detention because the increase in 100 year peok flow from the pre-developed fio the developed condition is less than 0.5 CFS. The actual increase is 0.16 CFS. The oreas used to calculate the flows were the same as those areas used in the pre-developed drainage calculations. It should be noted that the new houses csnd the private road will use infiltration for drainage disposal. The site will be 100% infiltroted. Simifar to the existing condition, the SBUH hydrograph method was used to determine the peak flows for the various storm events. A level pool analysis was performed to evaluate the pond performance during the various required scenarios. The computer data sheets for the developed flows fo{low this page as well os the works sheets and the time of concentration calculations. A brief summary of the developed drainage characteristics are: time of concentration: 5.00 minutes 2 year peak flow: 0.11 CFS 10 yeor peak flow: 0.18 CFS 100 year peak flow: 0.27 CFS total area: 0.50 acres pervious area: 0.28 acres curve number: 68 impervious area: 0.22 acres curve number: 98 -s�� 2 ' 0 =��, � .- � s�� o _�1� � �. �, �� 1I 'o -�� .1 -- ,� ��'� %'�"'� �,�C�'��# 1 _ '�� '�� . .� - CC, � _ , ! ' C <'J �. J'�� Z� � � �'� �� -- - � � S��# �I�CI�� i � �.s �'..�.c-i v��w, s = � `, -.L S�c,� �,�� s v-.�..0 5 a� s�oc� � n ' �°ro,>.,_�� .��. -z�'t' "a �-J`�' �'�'��'�'�`� '.�'"� v�' "�l'•1�1---, V��"1N� �V��V�1�• �1 I C��,� ;y O'�.�?��'�;vc v �o �v.�� '� � �:� �� O = �,Z ' n - c�..S ' 0 �' �`-"`�-�--� � �-,� _�` �, s c�C��,'�.a-a� -;� ; � �# �2'� _ =�' �.Lo� l � Sc�o�;��,--��,�r. . ��;.Q1 �2 . � j J JS' �st'' � — �;-�i �'Z �-�crL�j� +��`'i �-�� 4�'� , �c�.1 -��,�!c.� �--ra��1 � _S �c�C; ; � ;� C� � ��m��'l,aP ��'� Z `rS CZ'>Z� ;�' 'S C-C'�?� � S��`�4'�! �u 2 l � -b��l ', ��+rran�-►�� '� �scz� �a'��.� � , �b = �.� ' s�o►n�� ' � ; �� -��`��;c�,��h:.� � S� �os �s d��s :;.T-a.�-an J � C � . �� 5��.� ��, �� os � o =�� -��u�-�� ;�Sa�ora��- a�,c� av�. �+c�. �a;�u-a-�o S� -z��,� a,Nr,�S a v�. -aS� :�� ;��.�� =� c�r�� Jaeger Engineering OYLER SHORT PLAT _ DRAINAGE CALCULATIONS DEVELOPED HYDROGRAPH SUMMARIES BASIN SUMMARY BASIN ID: B10 NAME: DEVELOPED, 10 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 50 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 2 . 90 inches AREA. . : 0 . 22 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 68 . 00 TIME OF CONC. . . . . : 5 . 00 min IMPERVIOUS AREA ABSTR.ACTION COEFF: 0 .20 AREA. . : 0 . 28 Acres CN. . . . . 98 . 00 PEAK RATE: 0 . 18 cfs VOL: 0 . 07 Ac-ft TIME: 480 min BASIN ID: B100 NAME: DEVELOPED, 100 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 50 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0 . 22 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 68 . 00 TIME OF CONC. . . . . : 5 . 00 min IMPERVIOUS AREA ABSTR.ACTION COEFF: 0 .20 AREA. . : 0 . 28 Acres CN. . . . . 98 . 00 '� PEAK RATE : 0 . 27 cfs VOL: 0 . 11 Ac-ft TIME: 480 min I � � BASIN ID: B2 NAME: DEVELOPED, 2 YEAR I SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 50 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 2 . 00 inches AREA. . : 0 . 22 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 68 . 00 TIME OF CONC. . . . . : 5 . 00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0 . 28 Acres CN. . . . . 98 . 00 PEAK RATE: 0 . 11 cfs VOL: 0 . 04 Ac-ft TIME : 480 min A. HYDROLOGIC ANALYSIS The site is exempt from the peak rate runoff controi due to the negligible peak rate runoff rate increase exemption. This is specified in the 1990 King County Drainage Manua{. The developed peak 100 year runoff flow is 0.27 CFS. The 100 year pre-developed flow is 0.11 CFS. This is o 0.16 CFS difference, which is less thon the 0.5 CFS maximum allowed for this exemption. B. DETENTION ANALYSIS AND DESfGN Detention Storage is not required for this project as stated above. C. BIOFILTRATION 8iofiltration will not be provided because the new impervious surface subject to troffic is less than 5000 SF. The new pri�ate road and hammerhead turn-around is 5948 SF. The estimated areo of the new driveways for Lots 2 and 3 are 500 SF each, or 1000 SF total. The total impervious subject to traffic is 6948 SF. However, we will be removing an existing aspholt driveway on the adjacent (ot to the south (Rifey Shorf Plat) in order to consfiruct the new private road. The area of existing asphalt driveway that is being removed is 2280 SF. Thus, the total new impervious surface subject to traffic is 6948 -2280 = 4668 SF. ,i _ _ __ l _ _ _ Q,�� _ S�o�- - � �-� - _-- � - - ZNfl�v � p��- �,�� - - wN S1�v t �t�;=1 L..T'.�1P-�1 O t� - -�l� CS • -- q - - - - - _ __ --- - _ __ _ _ U �� (.� lCl�g �c�1n+� SU V-`,',�.c1L �.�e-� - - - S� _ _ __Dessc�--�1��0.�,��o.�-t�-=- 5� � �` -- - �- ,S - - _ _ _ - — - -- - - -- - - - - - - _- - —- -- -- --- s ► � —�— " -- — -i�-- -- - 1'_ c�r-thL ._ �� _ _ p2.�- __ �o� - -�•--- ��'�`-�-�-J-_ � � .-- � , 1 (�o�_ __s� __ ►-z�� -` ~ � -- -- ---- - -- -_�_ �r1�'1 i - --- ---- -- - - -- - - --- - - - -- - _ - --- _ --- - - -- --- - Z . _ SQ�_T�L _ �e.c�c��-�-, --- - �-o�-�-� a'-- -- 'r -- -�-'`� --- -- - — - - - - - -- - --- --- ---- - - - - -- -- ---- ---- - 3 _--- --� I T � - - - -- -- - - , �,c.� . rn �v_rY,_ _ ��1_._� _ . - - -- - -- - - - - --- -- - - - - - - - _ _. - --- - -- r., i ^, � _ _ _!�S�_ Z$ r�•- -_�T � w_co�.2 -j�-e�n�-- �e-r' -- -- . ��O S�" _ O.—i� - Y��__ C3-1��- - - - - --- ---- _ �- � �,�r-.__ _��= __ �- .s. ! ��_ _ - -------------- - ------- --- - - -------- -------- -- --- ---- -- - - K1 '� G COUN7' T', w' ASH1 '� GTO '�, SURF .ACE WATER DESIGti �iANU4L _ o A licensed septic system desipner or svitably trained person workinp under the svpervision of a I�censed Protessional Enpineer shall make an inspection of the soil after the system is excavated, before ihe trenches are filled with �ock to confirm that suitable soils are present. Method of Analysis/Length vf Rooi Downspout Infitlration Trenches The lenpth ot trench required is based on the U.S.D.A. soil texture class, the ro�f area and the site location, using Table 4.5.18. The length of trench required is determined by dividinq the roof area by 1000 and multiplyinp by the unit length I from the chart for the soil type and multiplyinp the result by • the repional scale factor k shown in Figure 4.5.1 D. The trench lenpth L is computed usinp the followinp equation: L = (AR/10001(�!(k) Where: Aq = area of the roof tributary to the system, ft�. (Note: a typical single-family residence has a r�of area of apprcximately 2,000 ft'.) I = the unit lenpth of trench required per 1,000 ft� of roof area from Table 4.5.18, h�' k = the repional scale tactor from Figure 4.5.1 D. • TABLE 4.5.16 INFILTRATION TRENCH LENGTHS FOR RESIDEhTIAL ROOF DOVI'NSPOUT INFILTRATION SYSTEMS � Soil Tex�ture Class (U.S.D.A.) L;neal Feet of Trench per 1000 L;neal Feet ef 7rench � ft� of Aoof - Sea Tac per 1000 ft` of Ro�f - Landsbur 1. Coarse sands or Cobb'es 15 20 2. t,�edium sand , t5 30 3. Fine sand, loamy sand 60 75 , 4. Sandv loam 100 125 5. Lc�m 150 190 Example: Proposed residence located at Kent East Hill Roof area (AF) = 2,000 square feet; Soil Texture Class = loamy sand; From Table 4.5.1 A, 60 ft trench/1000 ft� of roof, from Figure 4.5.1 D k = 1.0 L = (2000/1000)(60)(1.0) = 120 ft iNote: could be accomplished by two trenches). � 4.5.1-3 ll,Y: CS� Z.SQ � Q , 2�J ��`^'��• �`1`�1�,;1 L!V��, � � `j � S�� SO 'Q ;^c�-A �d�L�'JS�'kG ��'�� '�fl'a� C� � �, � ,�� 1 +(�s ' � r 11��0.�,,;� Ut� _..>a..��'1 �.*- 1.�i�'J U� `, �!V ��; . hl��G'�J1 v,A!"1� >V�'(�-� y 1 �Q� \�a(Ya� � � � �' ! � ��7 Z1 's'� Z5�`� � �i '� Q�,Z = a�o�, �� C� � �o� �1 � ��J�' ``•o _ �u�v.a / �-�► � 1 '� �-"L"U�/ u` �� ' O = �'.J�1 ��' nl,��JJ �c�. -��w, , '�-, •�;J�. �v,/. . Vr.;�C� ��,P�V'C'O\�� "'. L,C .�-f, �;�'t�'. '1��'/� ` ' ' ! �C.�.��. �,A�' :L Y/��. li L�, � I \<.. � , (J .1. � �^ g�Z %�� , , o�� -�v� , �I b = �a�:; ��-- �-¢.� � � � '� V'�aJ��:�. �--.��''-�L� �-�'.�,�' = 2J�n c� S �, t ,�, , T J�...:t. 2+'�.;.1� S�� , �,a t► � �� Jo ,�o, = g}`1� = �-��, � ��.1 �,fi� + , �, `�� z �e �b p .s� Z L T�� =,-�-�-Qi- � '. �� z��S°�l = ��r �►on �,�o�) � `�S S = �'b°�� - 1� C'Z.L =a'�CS'2 �b � �'1�� • � � : -�-� � -��.�, � � �b�r = d�� .,�r �;--� ��b � , �S a�..s .� C�.� w,�s ��►��h ��..-� � . . H��s � . _ --. f�--� c , � .'� _ �-Y-: - -7-`.�,-. � ,-.�- � - .-� _ - � _ � � b°1 �� = �r�J ` .� '3.� 5.�.�t �c� S' �-Ocr'�a-n�-a� ' � � , � �F b� �� +��`js� -�-��ca-��,��o� +`�2)Q-�' I ,0.�ctiax� —vl�c� 3 G� ��UC � ; � �, � t�.l►�a�l�s U�C1�n�+..t.�y`..�� . f��C�--a� �� '' v �I`t�►S�S Na��1.�i.:.r�� a� �dl�t� � , Jaeger Engineering OYLr,Fc SiiGRT PLi.T DRAINAGE CALCULATIONS ROAD INFILTRATION Hl"DROGR.APH SUNd✓�ARY BASIN SUMMARY BASIN ID: C100 NAME: PRIVATE ROAD, 100 YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0 . 16 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : TYPElA PERVIOUS AREA PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0 . 00 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 68 . 00 TIME OF CONC. . . . . : 5 . 00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 A.REA. . : 0 . 16 Acres CN. . . . . 98 . 00 FEP_K F�TE : 0 . 13 cfs VCL : 0 . 05 fic-ft TINE : 480 min �ile Basin Hydrograph Storage Discharge Level pool � Jaeger Engineering 2eeeeeeeeeeeeeeeee ; 3eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ; ° ROUTING COMPARISON TABLE ° ° MATCH INFLOW STO DIS PEP.K PEAK OUT ° � DESCRIPTION rEAR PEA�C No. No. STG OUT HYD ° °___________________________________________________________- i °INFILTRATION 100 YR 0 . 00 0 . 13 1 1 290 . 16 0 . 05 11 ° � �T--=� _______= o �r� o � o � / o � ° �{�U.Sl �e. l e 53 ��o.l,n o ' ° � ��.n�i I��'►�� 0 0 o �� , OSZ L�s� o 0 0 0 0 0 0 aeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeef ��ailable Memory remaining: 204008 bytes Current Data Set Name : \OYLERSP.bsn I L��c.� �� ..`I �s �� Pr�� -�� 1�-� �� File Basin Hydrograph Storage Discharge Level pool - J2eeeeeeeeeeeeeeeeeeeeee; 0 0 °RectancJular vault ° °Trapezoidal basin ° °Underground pipe ° °Sto list ° 3eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ; ° ° UNDERGROUND PIPE o 0 ° STORAGE STRUCTCTRE ID: 1 0 0 � °eeeeeeef °Name : INFILTRATION PIPE ° °Pipe Length (ft) . . . : 104 . 00 ° � °Pipe Diameter (ft) . : 2 . 10 ° �� ,,,., �,p °Pipe Slope (ft/ft) . : 0 . 0000 l ° � `"� `� °Stage-Sto Increment : 0 . 10 ° 5..�-rU �'�'Ulr-Q, °Starting Elevation : 288 . 60 ° °Structure Vol (cf) . . 360 . 22 ° ° Ac-ft . : 0 . O1 ° 0 0 °PGUP PGDN F3 : Get F6 : Delete F10 : Exit ° aeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeef Available Memory remaining: 204008 bytes Current Data Set Name: \OYLERSP.bsn rile Basin Hydrograph Storage Discharge Level pool 3eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee; ° MULTIPLE ORIFICE ° ° DISCHARGE STRUCTURE ID: 1 ° ' 0 o I °Name : INFILTR.ATION TRENCH ° I °Peak Dsgn Release Rate : 0 . 05 cfs Orif /flow/elev ° °Orifice Coefficient . . . : 0 . 62 Dia (in) /cfs/ ft ° � °Lowest Orifice Dia (in) . . : 1 .27 ° � °hl : Outlet to 2nd Orifice: 0 . 00 ° � °Second Orifice Dia (in) . . : 0 . 00 ° °h2 : 2nd to 3rd Orifice. . . . 0 . 00 ,� ° oThird Orifice Dia (in) . . . 0 . 00 ��J��_�1�`.r o I h3 : 3rd to 4th Orifice. . . : 0 . 00 .�.., ` °Fourth Orifice Dia (in? . . : 0 .00 S�G' v�— ° °h4 : 4th to 5th Orifice. . . . 0 .00 � ° � °Top Orifice Dia (in) . . : 0 .00 ��C�U1v�� ° o '7 0 �r.., c� °Elevation of Lowest Orifice. . . . : 288 . 60 ° °Outlet Elevation. . . . . . . . . . . . . . . . 288 . 60 ° °Max Elev Above Outlet . . . . . . . . . . . 291 . 10 ° °Stage-Disch Increment . . . . . . . . . . . 0 . 10 ° 0 0 �v°PGUP PGDN F3 : Get F6 : Delete F10 : Exit ° Cuaeeeeeeeeeeeeeeee2eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeef KING COUNTY, WASHI � GTOy, SURFACE WATER DESIGti J�IANUAL , �4) The enpineer shall periorm svtfc�ent tes:s to determine a representat�ve infiltrat�on rate for the � site, but st leas� three tests shall be periormed ior each proposed tank or pond site, and at leas� 2 tests per acre and a minimum of 4 tests shall be periormed tot each c�oscd depress�on. The measvred rate shall have the lollowinp factor of salety appl�ed: for the EPA method F.S. � 2.Q; for ASTM D-33S5, F.S. = 1.�5. (5) A minimum of two soils lops, eztendinp a min�mum oi 5 feet in depth belpw the bottom of each proposed tank and a minimum of two soils lops, extendinp a minimum of 5 feet in depth below the bottom of each proposed pond shall be obtained 1or each 10,000 sQuare ieet iplan view area) of proposed pond infiltrat�on surface a►ea. The lops shall describe the S.C.S. series of the soil, the textural class of the soil horizon throuph the depih of the lop, and note any evidence oi h�ph _ proundwater level, �ch as mottlinp. . TABLE 4.5.2 MAXIMUM INFILTRATION RATES FOR SOIL TYPES 1J�aximum Infiltration Rates IJ�aximum Infiltration Rates Soil Texture Class (U.S.D.A.) (lnches per Hour) (Inches Per Minule) 1. Coarse sands or Cobbles 20 0.33 2. F,�edium sand 8.0 0.13 3. Fne sand, loamy sand 2.4 O.C4 4. Sondy loam 1.0 0.017 5. Lcam 0.50 O.Oi,8 100-Year Overflow Conveyance ,�n overflow route shall be ioentifed in the event the tank or pon.�i infil;rstion capau;y is eaceeded or i the tacility becomes plugped and iails. Fonds sholl ha�•e an emerpency spillHzy dEs�pned in accordance ��i;h the R;D pond stand�rds. All inii!trat�cn c�er�lew sys;ems sf�all be des�Qr�Ed ZO CC1�'EY ;t��e i 100-yesr 24-hour desipn stcrm e�•ent to the na;ursl svrface ou;let. All overilew sys;ems shall meet :�e requiremen;s of Section 1.2.1. Oil Spill Control All infiltra;ian facilities must h��e an oil spill con;rol device upstream of the facility to caGture any oil or oiher floatable contamir,ants before they erter ;he infiltrat�on facility. The oil control device may consist cf a Tee sec:ion in a catch basin or manhole. The o�l control dev�ce sholl prev�de prctect�on �� to the 14-year desipn storm. , Groundwster Protection StandarCs � The rotection of r�undwa;er uali • I� p p q ty is recogni�ed �s an issue of grea,er concern th�n in the past and groundwster protection stan�ards are ch�npinp rzpidly. Increosed s�feguards are required. The i 2pplicant must check state �nd other local repula:ions such as the Critical Aquiter Recharge Areas ordinance, basin plans, communi,y pl�ns, Kinp County Health Department repulations and check with (ocal woter purveyors to determine if there are sole source aquiters, wellhead or groun�w�ter prctection i zones, or aqu+fer recharpe areas which may impose more strinpent requirements on infiliration tacilities I :han these in this manual. Groundwater pun-eyors should be responsible for determininfl the czpLure zones of their water supply welis. If federal, state or other local jurisdicti�ns have more stringent proundv.�ater protection requirements th�n ;hose contained herein, the more strinpent requirements sh�ll zpply. In no case should infi';rztien ponds �r�d tanks te placed closer than 100 feet frcm �rir:King water vrells and sprincs used for �rinkinp wo;er supplies. 1"Jhere water supply wells exist nearby, it is the � 4.5.2-2 ]l;sc , � � f VI. CONVEYANCE SYSTEM There is no conveyance piping proposed for this shorf plat. The drainage from the joint driveway will be infiltrated into a system under the private road. The 2 new houses will utilize individual lot infiltration systems and thus will not require a piped outlet to the droinage system. VII. ADDITI4NAL STUDIES OR REPORTS Design ccslcu{ations for the individual lot roof downspout drainage systems are attached following this page. Soil log hote summaries are also attached. VIII. BASIN AND COMMUNITY PLAN AREAS This site is within the City of Renton It is within the East Lake Wcrshington drainage sub-basin. XI. OTHER PERMITS Building permits will be required for the 2 new houses. � SOILS tNVESTiGATION SOIL LOGS: Soi! logs were excavated on the site in three areas on this site and on the odjacent Riley Shorf Piat. The soil logs on the both shorf plats were very consistent. The results were olso very consistent with the soil logs on the nearby (1 lot to the south) Roy Smith Short Plat. The soil layers consist of a thin (6" +/-) upper layer of topsoil, generally with a gross surface. The second (ayer was medium sand or a coarse sand with few cobbles. This layer generally extended to a depth of 36". The third layer was a coarse sand mixed with gravel. This extended to a depth of 7' deep on the subject sharf plat. The bottom of the soil log holes were dry and there were no signs of groundwater within any of fihe soil logs. The anticipated depth of the infltration trenches is 42" (to bottom of trench). The required 3 ff. of separation between #he bottom of the infiltration trench and groundwafer will be easily met on these sites. The soil logs were performed in Morch and in May, 2003. There are no steep slope sensitive areas or wetlands on the sites or adjacent to the sites. The existing house is currently connected to the sewer system within Aberdeen Ave. NE. There are no septic systems on- site. There ore no wells within the area. INFILTRATION TESTING: Soil infiltration testing was attempted at two locations on the site. The EPA falling head testing method was foUowed. However, the soils are to be pre-soaked for a 4 hour period. The percolation holes would not hold water to allow for the sa#uration period. Measurements of the percolation rate was performed within the holes without the saturation period. This is acceptable in soils, such as sands, that are not subject to expansion ond swelling. The percolotion rates within the two holes was measured at less than 1 minute per inch. This would assign a design rate of 1 minute per inch with a safety factor of 2, as specified by the County Manual. Thus, the field measured design infiltration rate would be 2 minutes per inch. DESIGN INFILTRATION RATE: The infiltration rate from the field measurements was determined to be 2 minutes per inch. The soils type has been identified as medium sand and coarse sand. Medium sand is fihe most conservative e and will be used tYP as the desi n soil. The 1990 Kin Coun Manual desi nates a moximum 9 9 tY 9 design infiltration rafie for various types of soils. These are shown in Table 4.5.2 of the Manual. The maximum design infiitration rate for medium sand is 0.13 inches per minute. This corresponds to o rate of 7.7 minutes per inch. This is the infiltration rate that will be used in the design of the system. tJ'�L;� ��t O�Z� �-PrT � SO!► '.� �,� i y '� � FV�L�'�\ S�� ;_lY-r r � �O�- J O'�- �?�'� �, Lo_�- bt owr ��l ��Y j' �, � � c , I�� , a �� - � � ► � I Z'� - Z�'r'` ; ,-�2 au.re�'.c sa� , co a�.�r.s� 5�.�,,��Q I �- � I ,�� '�0 66Ee lo�s� � ►I r--� �, � � ' ► 1 �- - �� 1 � ; e�w �, ��-� S , ,��y � �� c.� �s , ic�s� , � , �� n��'s ' 5� - � C� ��w �n ��'n��v� s�� c� b-bf e s- � ► I� '��.� , o�� , r� � r�fS�. SO� L i--oC� �` ? �" = ( � � i�vr-e� o" - , � ` � , , �� ' , �o-�rL :�t'�� SC�.-�n� i�p�t► % v , ��1� �TS, � c.��0��S� � (�?se� � a � . _ �2,, � �.�-e Y ��-� s� .�, c�o�!�.; `'7 �,�� ,� �op� -�e�.,J �Nc�� V v V1 t/�►'�� . � �2'� - �3� , �ra�r� _►^ne�� .rd---,� no G��s I J ��.o r�Ts, ��o se, , o`�►'-Y s0 �L. '�oG � :: L�.� = ` ��i�,►-�.� ,� �r � � - (� '� ��rG r�x��r� �� SD t � � �oo �� l c �r , �(�.0�� (�?-S� ��/ (p - �(o � i_lC�h t �rn w r1 C-�a..p^s�- S-�� -�,v , �� C�°66�e s � � Yvo�S, �ooSe , �� . - �o ' t�.�, � � t�r�c��c�v�r� so--v�, rn e.�Y c:o b�(e.ri -re,�,c� r��Ts , �r,0 s�� ?sr� , X. EROSION CONTROL SYSTEM II The erosion control system was designed to minimize any contaminated ' site runoff from entering the adjacent properties or leaving the site. There is little possibifity that runoff will enter a neighboring property since there is minimal grading necessary for the deve}opment of this site. The clearing limits cover approx. the entire site with few of the trees being saved along the wesfi property iine. Cleoring for the building pods wil) be performed at this time. The potential for runoff and mud entering the public ROW along the frontage road will be minimal because the area to be worked is very small. A quarry spall construction access is shown in the area of the new private road. The sifie is small enough and wifhout the need for significant grading, fhat o sedimentation facility is not warranfied. The specific trees that ore proposed to be removed are shown on the erosion control plan. Besides the silt fencing, the erosion controi plans also show the clearing limits and the standard erosion control notes for the City. ?.FFr`�DIX J� C".�TS , T1�=L�S , GFJ�s'-�:S F�CN FING COt'NTY 5�+'!i u.AJ;�?_T• i i , KING . , � . . ,, _ �. . � I - F7GL'r.E 3�.:.A N�'DFOLOGIC SOIL GFOL'P OF 77iE SOlLS I`d 17NG COLJ`�TY � , HYCAOIO��C Hl'DRO:O�tC• SO�I GpOUP GAOJP• 501L GAO'JP GROJF• � lJderwo�d C Orczs Fcat D �+ren:s. l.lderwaa� �!.z:e:� C O:��a D Arerr.s, E••efett �'a�e::al S O.-a0 C Seausl:e C F�ch�ck C 8ef1L��ham D Pu�et D 6riscat D P��a�ua 8 8vck�ey D Ra�ar 9 Goas:al Beaches �'ar'.�ye Re�sa� D F�rlrno�t S1:t Lca^+ D Flverwzsh �'a�:�5'e Edpewick C Sa'al C E��e�ett � Sam:,bm:sh D lr�ano!a S�ar.1e D 14:s�p C S�.a:ar D F9aL�s C 51 S�t C �J.6eed ,tJl�✓ial La� �'ar.;'�'e Sno'��nish D tJer�o� A Su::an C Ne»�e�g 8 Tu�1a D h'ooksack C Ur`,xn �'a::��'e FJo,;..a! San�y 1:.�� p 1�'oa�i�::,e D . F-l.T'.n"C:O�1C SO'L GnOUP C�.�SS1F�G�'+10'�S . A �.LW �'r1Gw YC:E' '� ��i5 �'.2'.�iny !�iy� i':i:;.o:i�"1 tc:e5. E�'E'1 H�ie'1 1�1�ro:.�y5'}"�+'E::2�, o.,: C�'S[.,..' � y . G~�E�)' O� CEf�. µ'�=.^-fxC�S��'�)'C.a�Pj Sc7�S Of �'2�'E�S. i'fSB S07 S }'2�•Q 2 ��^y�'1 .o:E O��c;Ef• � 2�cn5,^,7i55�0'1. �i 5. �!�OyE.'c:B�}' i:.Y _'_.�' Y•`'E^. _'�. cC �'��_� i-^, ;i�11 fc'ES �tiy :.`'�' :�t� v� .P�. - a � ' '� �S -'-.�y f�:�.C'ic'e c ,E:l C;, ?• E� c'�.: CJ.'1515:1�� C~�E`}' � '^�CE c;P'y (^e lp ^�:.e•c:P�y CC.ct�2 �Ea.:,�es. T'iese s�'s ~.Z�'E a na:e,�,e .��e � 1'+e'2f l:c•^•S•"7'SS��: C. ��J�2 c�E�Y ~�y� _�:.Q ��:E':::5�. C.. 1. � ;^' ;i J'1 � µ'� �l� ^,i M. r :5 .'c191� SC•V �. i..c c'eS f.') i 'C:;�. V E"P�, a'1� c�nss�n� G�:f`y � s:-:s N�ti z ;z}�er :�t 1.-��f5 G'O�•r,.�c� "�.:�e-r;err, a' w��er, � sois x�h mxe�'e'y f,ne 10 ��e ter:;;�es �he�e so.s `.�,•e a ��v r;e o1 v,•a�er t,znsmissio�. � D. (Hiy'� ru�c'f �^:e-:�:). S�Es t�a�;n� very sv+v 1�^;�tlon rtes ��en :!��ro��`�'y Ke'e� a�d co�s:�i�� , � c.tilefy d czy sc:s w�'� a Iti�!� s,va;i�� pc;err,a�, scf,s v.�^!� a perr".znerri hl�!� �z;er ;�5:e, S.IS v+7`1 E 'i I-a;�pan or �zy :¢}•e u a n�r t5e s�r!�ce, sr� s�afc� so's c:er near!y l�n�r.;o:;s r.-.�;e;al. These s:.s F.��e a �•ery s�c� .�:e d v.z�er;�zr�,s^�issi�l � ' • From SCS. TR•V.,;. �e:^:�d E:'rJa� !;.��e 1S.56. F�c!�ibh A•t. F.etiislo:-�s rra�e fra� SCS, SoI Ir�e��,�:i�� Fecord, Fo:-� �5, �e�e,�5er tc�?, i I I . 3.5.2•2 l i K1 `�' G COUNTY, u' ASI� I , GTON, SURF .�ICE v' ,� 7ER DESIG '� MA '.' UAL i _ ' r TABLE 35�8 SCS K'ESTER'� K'A$HI'�'GTOy FU'�OFF CL'Rt'E '�'iJriDERS SCS ��'ES�E�ti �'+'�S!�1N�TON FUNOFF C�F1'E NUMEERS (pu�is�+ed by SCS 1� �SE�) Runot! cu��e �:r��e�s ior se�eC.ed ap�cu'tu'al, s�5uf�an a*+d wt�n IanC ust ►�r Tv�e ;q rai�!aA d:str3;t�� e.ho;lr s;o�-+ du�;ion. .. CUA1'E NU1,�EEhS bl' HYD�OG�C SOII GROUP V,'�� USE DESCRiFTiO'� (/A ) 8 C D d C�It►.�a�e� la�+o(�): »•;,:er c�-�r,�on 8b 91 w o5 Movn:ain oae� a�eas: i�w q•�+win� b.�s!� s� p25sands I ;� E2 P9 S2 '��. �.�eadow or ;astu•e: I � ' �8 E5 P9 ��r. wy�d or io•esi land: u��s�u��e� <2 E�4 �6 Et lvood or fo�es� :a�: .•�� se:;,�� g�c��h or b:;sh �5 +'2 Ft b5 OrC'utd: M.r,h c,:er C�ca E1 69 �2 v O;+en sF.zces, !z»^�+s. ;,ar�:s, c�" :e.•ses, cene:e��es. �0'1�SG2�1'1,�_ 1 9DJd C^v"►v��0'1: C'2�5 C:�'ft O'1 �`�c �` �p,,,X.�� or ��•e o' t!�e a�ea � £�7 £S P� (�e`� . !air co��`��n: C'zss c�,�er o� 5.^� .. 'S°� o' ;`e a�ea �7 &5 aJ �2 Grzvei rc.z�s �� ;.2r�,in� tc:s � '--�'E ES :? St L�irt tL�::S c'?� ;.2.•ki•�y Ip:s �v!-'" � ;2 E2 �i F3 � .. .., i� � ITTaYE'�'�OL'S SU.''•2CE5. �vem�'11. .,:'S. E:C. Cc C8 �J _.. �� '�'1 w•e':E� �JJC�ES' ^:��ES. x"E'�'an�5. .^-'�'1�5. E'.. 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