Loading...
HomeMy WebLinkAbout03421 - Technical Information Report TECHNICAL INFORMATION REPORT � N � m Proposed Harper Engineering Building and Parking Lot NWC - S.W. 7th Street and Seneca Avenue S.W. Renton, Washington Prepared for: Puget Sound Electrical Apprenticeship and Training Trust 5700 - 6th Avenue South, Suite 200 Seattle, WA 98108 (206) 763-7755 July 6, 2007 Our Job No. 12948 f ��� � �� ��RY �acoes � aF w�sr�,�, �� �� y� 2 � n ';�, p ?7694 � rGl .`�V:i,�, �v�' L+ J �, HA� EY.PIA�3 IO�IO��� � � � S � ��� - � � � Z CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES - 18215 72N0 AVENUE SOUTH KENT,WA 98032 (425)251-6222 (425)251-8782 FAx o � 2 BRANCH OFFICES ♦ OLYMPIA,WA ♦ TACOMA,WA ♦ SACRAMENTO,CA ♦ TEMECUTA,CA s� �1���/� �y www.barghausen.com , �� N�'ENG�� 3 y2/ 1.0 INTRODUCTION/GENERAL INFORMATION CITV OF RENTON RECEIVED AUG 15 2007 BUtLDINGDIUISION 1.0 INTRODUCTION/GENERAL INFORMATION The proposed project site is approximately 2.21 acres in size located on the northwest corner of S.W. 7th Street and Seneca Avenue S.W. within the City of Renton. More particularly, the site is located within a portion of the Southwest quarter of Section 18, Township 23 North, Range 5 East,Willamette Meridian,City of Renton,Washington. The site is fairly triangular in shape with a large curving side located along the northern property line of the site, which is adjacent to a railroad right-of-way. S.W. 7th Street forms the project site's southern boundary and there is an existing development located east of the project site. This is a redevelopment project currendy consisting of parking lot and landscaping areas. The proposal for this development is to modify the parking lot to construct a new building for the proposed Harper Engineering manufacturing and office space located in the central portion of the project site. Portions of the parking lot will remain intact and portions of the parking lot will be replaced with new parking lot surfacing. The total area of impervious surface subject to vehicular traffic will be substantially reduced with this project. There is already an existing conveyance system located on the site that routes all stormwater runoff into a detention vault sized in accordance with the 1990 King County, Washington Surface Water Design Manual (KCSWDM) in March of 2001. Please refer to the grading and drainage plan located on the next page of this report for an explanation of how the site will be configured under the new developed conditions. Since this project site is not increasing the amount of impervious surface by more than 5>000 square feet, and since it is also decreasing the amount of impervious surface subject to vehicular traffic, there are no modifications proposed to the detention vault located in the center portion of the project site, which discharges into S.W. 7th Street. As mentioned previously, minor modifications will be made to the conveyance system and, since catch basins are being , added, the conveyance system will likely be more than sufficient to convey runoff from the project site to the existing conveyance system since all pipes are proposed to be 12-inch. The Technical Information Report for the original parking lot development is attached herewith in Appendix A. Please refer to that document for how the on-site facilities were sized for this project. The total increase in impervious surface with this project is 3,563 square feet=0.08 acre. 12948.001.doc ( � GRADING AND STORM DRAINAGE PLAN � i ,���,W� .a�. .�o,o.,E o��,,�KE �.��,,o.�� s,. ,oa»� �o P P P —TTTT _ � — '"" '�"'""" �► CITY OF HARPER ENGINEERING C0. ___ RENTON 208 SOUTH TOBIN STREET """'°' - "� RENTON, WA 98055 =� � °M0x i DATUA� .. "`°� i •�u�y.�� aionNng/Bu�id�ng/vubi�c Wo�ka Dept. N0. REVISION BY DATE APPR �^^"^�o- ""`"C0'0M" n � / i�.w\ �� d� ���7�.1 ��' t0" DEC�� \"J � ��^I Y".�.��- .�� -.: � / /� 49. � /' . + ���%�r...".y-' . ; . ' ' � \ ,,^ ✓ �� e cw „a //�'�.f ,� '� o � ... ,�'" r \ � „ w_. � �m ...� __ 11 � � / � ' -`_ \ .. _ , ._ . � . �- . ,� / � � . � — � � .•- � = , �s� � -''t o : ..--'" �£et0.-t12_BEB9F3-w,L1�, . '/ ." .�-�_" � _..--. .. .__ � • ,.-�" CAP CNi LS 1889 , :- �°� ��, .. � _ FNp� ` REB N _.._, / �, .._.. ._, . �..__.._-«.-..._.t ,>-___� 045' SE OF SET R••... � AP KEO 'l o p _.__,_.---_..._._._ �-.. ,..,, ,�...�-' ;------.. ,-. _ ��' _ �.'� ��8 � 0 35 �n -.,� ..,. _ RNEi ' � i •'� `./ '""-� i, C�a ,^s / OF S��CO i .., . � , ... ::.....►;•'-' `1 /li'!%'�p �� „' _� ,�� _' .. .. ..,�. .. y{ f.�✓'' .w•...^` ^ � ..., ... "�,. -� ,.._. m , ..��, � � 1 f/,,•;.- . �� "" � � � \ . �`I � \ ..,r f .,�/'� :' Q�' -:�- 'y-. �' �\ � o /I N �T r :/ ��� j �_ .��5 I � �r `/ //��/°; ,'C� =i�-%'/ ' s� �� I �/ �///.� '�i � ��� � . \ . - �' � �� �, �.. ���. ; � i%/' U - ,�.'" :�, .:'� � �'' s ! '� �� ��� ,!,%' _ � \� ;', I I ; �� r:`-%%,`� '� �� '\ ;, , ' ,'„ =�''�a� �_......... ,.• , :/ \�� �:.. . , � /!/ > \ s� ; i � ' �', "��'"''�//N Nm^�'/ `�>/- � J� ag�� � . �` t u ' / � ',, .,•''. //i , ,/. ��,, , -� �� �% � p �+" �� �� � .� �' , ��- � � ��l .•��//�/// ���+i��.+' �`. � � �� �' i 3�7Sxo ; � , , :` ''. .''' , ; �� ' � 7,� `r '" `-���� '�i ��,, ;. . ; � f, f . ,i:% . � -. pm � � i�.' .VSM•' / �' /� \` ` , 4 � ` ,y��� . `i�J ���� I b� (�� ` � �, I �. �` , �!, . . /." � � ...,�_._ ,' � �� . � 0 1 �N : � � ' 1•.� ;.�'� �. / � / ♦ .\`;�' �4 O� � � � � � � !�i� ��' /�/i/ /� / � I�� � / � ��I f� I � '%7,REBAR W/ I , � � U � ' � � _ ry� I � -,CNI LS 18898 �,,,,�',�'� �i` � � % � � ii�'�� � /� j�• � ��,,'�� � '^' o �� � P` ��-� i � .U'" I � j . �r e �� I I � ~��m `ii�' t�� I I� I �I ���� J�� g (�� � � � '^ , / � � I �� � E� � . , ,v , , �, o� , � -S" fAS PiPEU E I I T/ � (' � I /-uARK[R(fY % � -� � .I , � 'R ,./ 1� �j�;!,`Jii ..._ . �Tn.o. ... .. ,�' V � t'''_�'� �1 '�` �' �,�af � �'" � ��� � T � � � i ! '.� � �� � ' -- f:�i � \ � I � �t k ' //,^ '��� LI� �'�v ��' �'� �`�' �� , � 'E;� ;`� (2)-2�' CW B �� I ... n C rN� ^ ,')-�5 Cw�� i I / I��•,'��//.:Ar - It Y e;o� I Y'8� �O �,� �I���I a'N�, i�/ � , � . i '�) I, 1/i�� � i � � ., `� NJ i._�x-_ IJ --_ -_�- V /�h J�I , I � � i \ . `��'�- � I •,'1 / �� 1 '�`��+l�� \ � , , �, ,f ' � � �� � .,�� �, , .,�� � �, �� ', ' D �����, � , �a , ��� , �� �:,,r� ��; � , . �,,� ,;,�. . , � � �o � c ..�; , ' _,�.�� I����\ / �••...r V� � �, � , � � r'-� f , , � � T � ,.. � ...... n/� ,� p�� �' ✓� •� i��� �� ^�N � a �� . � � �i i :�� � ` / "�� .r� �` �. � P� `I o�... � o ' � r � — �,' I � /� 'I� ��`', N ��'�,� ' ��� I ; q�r � \ Z � I 1 ; � r �t��', r [^_ ' I � � ' €8� ', \ ii I i '� � � ! _,_.. y/ j �� :,. � ��� � u I T- ; �� ;, ':�� �--""�;� � ' m ��.Sox ,_ ��� ,! �' � � �' %I ' i � ��� r�' , ' 'n�� ' �� u � I�� � �� � A � �� � �'' ��-}� .��� ��,'�� ii l e�m �� ���� (� I � � �, _`'.�._ ii � `'� ��� i��`�� � "� �� ��' � i �-,R�, /� �j n n � �/\ il- � � � J� I l+ i . N 7J��.' 1 / \ II � o I ��y I&'p''�I�,..� I� �i; \/ l � � ,,,Pcn. l8:'�� � ` �� I II i 3��� � $I �y ' � '. I; ,d� ` II �U � � � 'II � � / _..1 // ` . r� `�� �.. � I � I ��� �S O �, ` �-�`-- �. v � �.� I;� a / -.{ , I �/ ,,"��p%zLC/N��„_ ,�o�p G _��_ , J �``� II � I / � � ��� .V �/ "} ; AEi��{ RIj7GE{J�"_"t.._� I � Ri ��E � ji 8 � i j u � .;' St�34 ii I � �� �f �L w ( I � i��` �'i,� �, �- �� I � � � I � o �ii !I 'i a Z � - � � �`�:�� � ��� � � , ---�- �`''•,, �� � �,� � �� i ' �� ' � � � � �� , I� ..7 __ I y' \�'v'4b. �IN � �/ I , , I " I ,' , , .:_ '�q,3'' �l l� � • � '< �:;, � u^�....� / ,... � � _ � � i� � I a � ' 2�--I ---------+•�^, �--- f i•oox II I� � �� � �' ��� _. r' . ii� '`.z ox � i�� ^' ITl i O � ( ✓� ��_ 1� lio j ' � p �� n�') , i..� � O �� _"_ '� ,�. ___ II � I � +�Y � ���mv/ � i � ;� e �-= ;i �,� � � ��� � "� �, i � � � D i -, � ; ; , �� % , ���� � SN�,'� � n :�',,�e�a 5��04� � �'�1; � � �.- - �--- �'�� i '' �o�� I III j I !�' � U � ��� o � �� � ��� � a-i:�--- -- �� /ii I ��•�� ,.0 i�x � � ^ <"'_w 'm ; Z� ;�Z� I ��� ----- � ,/ II I 3� �o� ,�~, � � �+ �`��� xo��� i I �� �a`�' '\�§^ n � �� �$ ��� � I �i r /Fr�a �'�^� �� I I F � ----- � ti� i�, I o � z o m I P II ' 1 1 - - -'- -- � N= �i � �x �$� I j� � 1 � � _ I '1 �.007, t 17 _ _.. ._ _ : N ( m�S� .19% �_,7,19% � �� �'� __ ' _ __'..i'"���_=a_��' ` ` �n ^ ASPH! I �� � - �- -'-� �`.ii �N G I p � /I PARKI� � '; �, ,` I ��f ��� , ��- iia ```'1 'ti�/ I oti ^�� I I� a � I , : '€ ^ R �l � _ ___ � .I � � � t �'; . �',�-•_.....�'t��...ii`. ' c mg �� - i ..' �� \.\._ .. ati �k r '__.' ' i r.� II 12� ` �� '`�l g �/ I ,� ; !� , ( u�" n� �._ , � � � � � - „-_;_, ' n - - - �� ',t �S j-i;-.� - � � . ' :.i� ' . 'a• . I �� � i � I i� I � ` • I N � � �„, ,---- �� i; ^ `V � � "ii o�- ll biC HC ,III�' HC H(: i °ti � �; �� � � 1' -_ - � �o�� � ,� � ;f � � � SG � ; �� /`�� ' n ;i �f �`�, ✓ . .�- ,�n I I ���N!v � � i i�� �h� A�� , � I � � _ O �I � � i u � ��� 9 ��1 �4.... � 6:1� ,-''.� 9 �' Io�' � /I :.� '� NC7 AE�`i, �) - \ �`_Y li J '�.��N�A_' � ca e,9 �� � � �� , .� - -. � I , J_ ... . ._ . _ _ �.. _.. - - - - - - -+ � S�{ � � � �/'� r�n I i� I\J � I � 1 ,J�� � �� _ � ` -_ . . a ��N� = ry,, Z � a<� � '•23,, rN.��' � I�- �. � "'�x y� � � �r��y��.I�_-`7\�>�� �� c p _ a . � ` ,. , , ,� , . . '} �p 4� �'+, � D ' A � ._...�+ � ��J1�. . 1 �`�1� roN I'�}` �_ tp8 IM „ �. r. �`�M. v'I i � ,.I� � �C� , ��' �r �� I � J �^`n'J I� �C ' ` ...—�%. ......+-�.-.�� �........�.�73- .. .:...n�ZC�. . ..� . �>"� .. _ . 7 �n, i �c N� --- �- - --� �� ''/`� -- » ,�� -- — - ---- --- �---- —P-� -- -- - 1' �,�:��;.� f '; � _ , � . .. — _ � � �~ �-ti- u - U �,--� � p CONC. � , - � --_- — �.,,-__ _' __ — _ - 'st����6 il-� _.. - {a� _ _ � �_ . � � C. � o . � " ' ... � �� ,,,;_.... "�— ' '. ""— �• � � � � CT T � � .�U 7 e« —� � — — __-_ _ � � CONCII� �{ � � � . ',. . ._.__ T.... _._.. _�-LLGI r;---�—U G i_..,.. 2 � -- .._-. '_ � , G �? ' UG -� � v � „ �., ���u � � - _ .tif - ..� ,'G 1 --` G ' •...-�" .-_.. " LONC w "'-� ' _- ' � m � � _y�_ ____ �.�'.� .... y-.," .'v � n� �� __� _"__'..-`i'.�... � �___�_ ' .�yo _' ___=v� c .,.. =__�`sc==_=_--c -- __ 4'L�. _ �____ _ ___ __ ^'60" CONC • i � T.� � � ; g� ----- . _.._ ; ` � -----------_�__---��_____-_�_ � ___ -_-_�_���� E , .. �i � v � � ,7.' rvc � .._._n..._.....,_. � �� i =_ � � „ __ � Q ._. 4' y..._. ' \ Y . � tl : � 1. 1 'SS-- S S$ - � ' � _____.._........_...._�...^ 17" PVC G� x 1�C. '� a � , '^ ' Z � � �.� � � �---� Z�f ; _55 � � m - - - - - _ ' � 58# 03"E - � F P FND. 2.5" SURFaCE — -- - " : ^ _ __ A O ; � z�s�4 c��c: -- ,-' � _ Q o 'n I 8RA55 CAP MON SSMH RI ��� � �th T R E E T � I � o �.ffl'� �I � 24 1',�..�_�/28/a� _...._. =..2326' _..__..... ve--•._.__. _.,9 ... & ._ ._ ->-- .--..- . .. IE CTR. 11"CHAN.=14 56� i .: � ...� �} i � ( m .-�W--- i � -------"-- � ------ ----'-- � .. -r-.. .. �....' W"'......' • "' ._.""•"..... F .� ""_' _'..E%iSTi wAtER __" ."._...""" _ � � � � � .......� .___ __ � • �. ..-' E ' ""=W.............. m' �. - �_ � � w-- i ';•--.....--- � . o � j� � N� �, �'� N� PUGET aOWER A/A7$iNDICATE ,� � 'W Y ' � ll i� , �� POWFR�y SOUTH S�DE SW 7TH ST � a NN �( NN �� g d $; � x `� " °�� "' i , , QA � Y 9 N Clt� � .C.E. JOB NO. 12948 � � M�I A � W a a � TECHNICAL INFORMATION REPORT Puget Sound Electrical � Apprenticeship and Training Program Renton, Washington March 19, 2001 Our Job No. 7976 tip. cR P�oF w^ Q � � 'o,Q ,p�23975�p �Q O� G/STE� G�� `SS�ONA4� ���.O� Q.G�VS �u�s:s-�a G/ mP �� �Z CML ENGINEERING,LAND PLANNING,SURVEYING,ENVIRONMENTAL SERVICES � �l � 18215 72ND AVENUE SOUTH,KE►vr,WA 98032 . (425)251-6222 . (425)259-8782 F�vc °s�` ��'� � www.barghausen.com �'7H6��N� TABLE OF CONTENTS I. PROJECT OVERVIEW A. Technical Information Report Worksheet II. PRELIMINARY CONDITIONS SUMMARY III. OFF-SITE ANALYSIS A. Upstream Drainage Analysis B. Downstream Drainage Analysis IV. DETENTION VAULT ANALYSIS AND DESIGN A. Detention Vault Calculations B. Pre-Developed and Post-Developed Basin Area Maps C. Wet Vautt Calculations V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN � A. Piped Conveyance Calculations B. Conveyance Area Map C. Miscellaneous Conveyance Calculations for Overflow Spillways, Stand Pipes,etc. VI. SPECIAL REPORTS AND STUDIES VII. BASIN AND COMMUNITY PLAN AREAS VIII. OTHER PERMITS IX. EROSION/SEDIMENTATION CONTROL DESIGN X. ADDITIONAL DOCUMENTS A. Retention/Detention Facility Summary Sheet and Sketch XI. MAINTENANCE AND OPERATIONS MANUAL 7976.003[DID/mrrdkn] II�I I. PROJEC'I'OVERVIEW The proposed project is located in the southwest quarter of Sectionl8,Township 23 North,Range 5 East, Willamette Meridian,within the city of Renton,Washington More specifically,the site is located along S.W.7th Street near the intersection with Thomas Avenue. The site is approximately 2.21 acres in size, and is triangular in shape with appro�mately 260 feet of frontage along S.W. 7th Street. The site is generally�lat,sloping gently toward the north comer. The site is bounded along the north and west sides by existing Burlington Northern Railroad right-of-way. The e�sting vegetation on site consists of brush and low growing ground cover. The site is cu►rently not being used,and contains no existing structures. The propos al for this parcel of land is to construct a new pazking lot containing 200 parking stalls. This parking lot will be used by an adjacent building that is being expanded and is requiriug additional parking. The stormwater runoff created from this parking lot addition will be handled using a piped conveyance system Once stormwater enters this conveyance system, it w�l then be oonveyed to a detention vault that is located on site. This underground vault will provide water quality and detention, releasing the stormwater at pre-developed rates. Please see Section IV of this report for further details regarding the storm system and calculations. 7976.003[DED/mu✓knj A. TECHNICAL INFORMATION REPORT WORKSHEET King County Department of Development and Environmental Services TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Par-t 1 PROJEET 01NNER AN� Part 2 PROJECT Lt3EfX�i�N A�tD ,;,,;;�'; PR:4;IECT �N�IN�ER DESE�ii�TION, '=3°-= - - � - - �-r-���� Project Owner Puqet Sound Electrical Project Name Puqet Sound Electrical � Aparenticeship and Traininq Trust Apprenticeship and Traininq Trust � Address 5700-6th Avenue South, Suite 200 Location � Seattle, WA 98108 Township 23N Phone (206)763-7755 Range 5E , Project Engineer Hal P. Grubb. P.E. Section 18 Company Barqhausen Consultinq Enqineers, Inc. project Size 2.1 acres Address/Phone 18215-72nd Avenue South Kent. Washinqton 98032 Upstream Drainage Basin Size 0 acres (425)251-6222 Part 3 TYPE OF PERMIT Part 4 OTHER REVIEWS AND PERMITS I APPUCATION - ❑ Subdivision HPA ❑ DFW HPA ❑ Shoreline Management ❑ Short Subdivision ❑ COE 404 ❑ Rockery ■ Grading ❑ DOE Dam Safety ■ Structural Vaults ❑ Commercial 0 FEMA Floodplain ❑ Other ❑ Other ❑ COE Wetlands Part 5 SITE COMMUNITY AND DRAINAGE BASIN ' _ :. ; _ - _ . _._.:_ �,_s _�. . Community Green River Vallev Drainage Basin Green River 7976.003(DEDlmndkn] Fait�6 S1TE GFiAR�C��'ERFSTJ€� - - - - 0 River ❑ Floodplain ❑ Stream ❑ Wetlands ❑ Critical Stream Reach ❑ Seeps/Springs ■ Depressions ❑ High Groundwater Table ❑ Lake ❑ Groundwater Recharge ❑ Steep Slopes ❑ Other Part 7 SOILS Soil Type Slopes Erosion Potential Erosive Velocities ❑Additional Sheets Attached Part 8 DEVELOPMENT LIMITATIONS REFERENCE LiMITATION/SITE CONSTRAINT ❑ ❑ D ❑ ❑Additional Sheets Attached Part 9 ESC REQUlREMENTS MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION ❑ Sedimentation Facilities ■ Stabilize Exposed Surface ■ Stabilized construction Entrance ■ Remove and Restore Temporary ESC ■ Perimeter Runoff control Facilities ❑ Clearing and Grading Restrictions ■ Clean and Remove all Silt and Debris ■ Cover Practices ■ Ensure Operation of Permanent Facilities ■ Construction Sequence ❑ Flag Limits of SAO and open space ❑ Other preservation areas 0 Other 7976.003[DED/mm/kn] Part 10 SURFACE WATER SY�TEM ❑ Grass Lined Channel ❑ Tank ❑ Infiltration Method of Analysis ■ Pipe System ■ Vault ❑ Depression SBUH Compensation/M itigation 0 Open Channel ❑ Energy Dissipater ❑ Flow Dispersal of Eliminated Site Storage ❑ Dry Pond ❑ Wetland ❑ Waiver ■ Wet Vautt ❑ Stream ❑ Regional Detention Brief Description of System Operation Stormwater controlled bv catch basins and conveved via pipes to underground vault for detention and water Qualitv. Facility Related Site Limitations Reference Facility Limitation Part 11 STRUCTURAL ANALYSIS Part 12 EASEMENTS/TRACTS ❑ Cast in Place Vault ❑ Drainage Easement ❑ Retaining Wall ❑ Access Easement ❑ Rockery>4' High ❑ Native Growth Protection Easement ❑ Structural on Steep Slope ❑ Tract ❑ Other ❑ Other Part 13 SIGNATURE OF PROFESSIONAL ENGINEER I or a civil engineer under by supervision have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attachments. To the best of my knowledge the information provided here is curag /� - -- 3• �' �/ Signed/Date 7976.003[DED/mm/kn] I� II. PRELIMINARY CONDITIONS SUMMARY \ . II. PRELIMINARY CONDITIONS SUMNIARY There are no condi[ions for this project. 7976.003[DED/rnm/knJ � �I � � h� � � � W E"� � � w w O � III. OF`F-SITE ANALYSIS A. UPSTREAM DRAINAGE ANALYSIS The existing topography around the site is such that the site receives very little upstream drainage. As previously mentioned, the site is bounded on the north and west sides by an existing railroad, which sits higher in elevation than the subject property. However, there is only a small amount of area between the site and the e�sting railroad tracks that actually drains onto the subject property. The adjacent parcel to the east is currently developed and con[ains all stormwater runoff, with the exception of a small portion at the north side along the existing railroad tracks_ Along the south side of the subject property is S.W. 7th Street, which is developed and has storm drainage system that contains all stormwater runoff. B. DOWNSTREANi DRAINAGE ANALYSIS The existing topography of the site is such that there is no downstream drainage system. Currently, the stormwater appears [o infiltrate on site. If the stormwater was to pond on site, it ��-ould eventually overflo«� at the south�vest corner of the site (which is the loavest elevation along the boundary)into the existing storm system in S.R'. 7th Avenue. Stormwater that is collected on site will be detained and treated prior to being released into an existing 60-inch concrete storm line within S.W. 7th Street. We are currently in the process of obtauung specific information about this downstream system. Once this information is available, it will be includeci within this report. 7976.003[DED/cum/knj IV. DETENTION VAULT ANALYSIS AND DESIGN IV. DETENTION VAULT ANALYSIS AND DESIGN Storm drainage that will be produced by the new parking lot will be controlled and conveyed via underground pipes to an underground detention vault located on site adjacent to S.W. 7th Street. This I underground vault will provide the required water quality treatment and detention. More specifically, this system has been sized using the 1990 King County Surface Water Design Manual. The enclosed calculations show that the system has been designed to detain the 2-year post-developed storm while , releasing the 2-yeat pre-developed storm,and to detain the 10-year post-developed storm while releasing the 10-year pre-developed storm, along with a volume increase of 30 percent. Calculations have also been provided to verify that the 100-year post-developed storm event will be adequately conveyed through the proposed system. The water quality portion of this vault has also been sized using the same manual. The proposed project will create greater than 1 acte of new impervious area subject to vehicular traffic. Typically, a bioswale along with a wet pond is required;however,with the proposed layout,a bioswale is not feasible. We are proposing an increase in the wet pool volume to compensate for not providing a bioswale_ This increase is 1.5 times the required volume. We had a similar situation on a recent City of Renton project that was approved. Please see the enclosed calculations for further details. Based on U_S. Department of Agriculture maps,the soils classification for this site is Wo(Woodinville silt loam). For the drainage calculations,this converts to a hydrologic group "D." 7976.003[DED/iiu�i/kn] �.,t� A�"�:��ITIc�-�I t:� l.0 's 4/26/O1 12 : 48 :43 am Shareware Release page 1 PSEA&TP DETENTION VAULT CALCS FILE No. 7976-VLT --------------------------------------------------------------------- --------------------------------------------------------------------- BAS IN SUI�IARY BASIN ID: Al NAME: 2YR PRE-DEV SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 .21 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . _ . : 2 . 00 inches AREA. . : 2 .21 Acres 0 . 00 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 0 . 00 TC. . . . : 64 . 39 min 0 . 00 min AB5TRACTION COEFF: 0 .20 TcReach - Sheet L: 300 _ 00 ns : 0 . 2400 p2yr: 2 . 00 s : 0 _ 0079 TcReach - Shallow L: 80 . 00 ks: 11 . 00 s : 0 . 0079 PEAK RATE: 0 . 19 cfs VOL: 0 . 16 Ac-ft TIME: 500 min BASIN ID: A2 NAME: lOYR PRE-DEV SBUH METHODOLOGY TOTAL AREA_ . . . . . . : 2 .21 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 90 inches A.REA. _ : 2 _21 Acres 0 . 00 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . _ : 86 _ 00 0 . 00 TC_ . . . : 64 . 39 min 0 . 00 min ABSTR.ACTION COEFF: 0 .20 PEAK RATE: 0 . 42 cfs VOL: 0 .29 AC-ft TIME: 490 min BASIN ID: A3 NAME: 100YR PRE-DEV SBUH METHODOLOGY TOTAL AREA. . . . . . . : 2 .21 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 2 .21 Acres 0 . 00 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 86 . 00 0 . 00 TC. . . . : 64 _39 min 0 . 00 min ABSTR.ACTION COEFF: 0 .20 �EAK RATE: 0 . 70 cfs VOL: 0.45 Ac-ft TIME: 490 min BASIN ID: B1 NAME: 2YR POST-DEV SBUH METHODOLOGY TOTAL AREA_ . . . . . . : 2 .21 Acres BASEFLOWS : 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 . 00 inches AREA. . : 0 .42 Acres 1 . 79 Acres TIME INTERVAL. . . . : 10 . 00 min CN_ . . . : 90 _ 00 98 . 00 TC. . . . . 8 . 81 min 8 . 81 min ABSTRACTION COEFF: 0 .20 TcReach - Sheet L: 50 . 00 ns : 0 . 1500 p2yr: 2 . 00 s : 0 . 0600 TcReach - Shallow L: 125 . 00 ks :27 . 00 s : 0 . 0100 TcReach - Channel L: 297 . 00 kc :21 . 00 s :0 . 0062 TcReach - Channel L: 90 . 00 kc :21 . 00 s : 0 . 0239 PEAK RATE: 0 . 94 cfs VOL: 0 . 30 Ac-ft TIME: 480 min t . 4/26/O1 12 :48 : 43 am Shareware Release page 2 PSEA&TP DETENTION VAULT CALCS FILE No. 7976-VLT BASIN SUMMARY BASIN ID: B2 NAME: lOYR POST-DEV SBUH METHODOLOGY TOTAL AREA. _ _ . . . . : 2 .21 Acres BASEFLOWS: 0 . 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 2 _ 90 inches AREA. _ : 0 .42 Acres 1 . 79 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 90 _ 00 98 . 00 TC. _ . . : 8 . 81 min 8 . 81 min ABSTR.ACTION COEFF: 0 . 20 PEAK RATE: 1 _43 cfs VOL: 0 .46 Ac-ft TIME: 480 min BASIN ID: B3 NAME: 100YR POST-DEV SBUH METHODOLOGY TOTAL RREA. . . . . . _ : 2 .21 Acres BASEFLOWS: 0 _ 00 cfs R.AINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION. . . . : 3 . 90 inches AREA. . : 0 .42 Acres 1 . 79 Acres TIME INTERVAL. . . . : 10 _ 00 min CN. . _ . : 90 _ 00 98 . 00 TC. . . . : 8 . 81 min 8 . 81 min ABSTRACTION COEFF: 0 .20 PEAK RATE: 1 . 97 cfs VOL: 0 . 65 Ac-ft TIME: 480 min BASIN ID: Cl NAME: 640 2YR POST-DEV (WETVAULT) SBUH METHODOLOGY TOTAL AREA_ . _ . . _ . : 2 .21 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : KC24HR PERV IMP PRECIPITATION_ . . . : 0 . 67 inches AREA. . : 0 .42 Acres 1 _79 Acres TIME INTERVAL. . . . : 10 . 00 min CN. . . . : 90 . 00 98 . 00 TC. . . . : 8 . 81 min 8 . 81 min ABSTRACTION COEFF: 0 .20 PEAK R.ATE: 0 .23 cfs VOL: 0 . 08 Ac-ft TIME: 480 min IJ � �L �7cW .L-N^�: O� O � �L T��r��- T H^� � �` �� /�`' `�o �ya„P z. l�� i � S �. � Z� i1C 4/26/Ol 12 : 48 :43 am Shareware Release page 3 PSEA&TP DETENTION VAULT CALCS FILE No. 7976-VLT --------------------------------------------------------------------- --------------------------------------------------------------------- HYDROGRAPH SUMMARY PEAK TIME VOLUME I HYD RUNOFF OF OF Contrib NUM RATE PEAK HYDRO Area ' cfs min. cf\AcFt Acres --------------------------------------------- --------------------------------------------- 1 0 _193 S00 6811 Cf 2 .21 2Z"R- � 2 � .417 490 12652 cf 2 .21 IOYR- PR� 3 0 . 696 490 19702 cf 2 .21 ��YR P� 4 0 . 938 480 13205 Cf 2 .21 LY2 �T 5 1 . 429 480 20234 cf 2 .21 �o`(R� P�if ' 6 1 . 974 480 28132 cf 2 .21 I�o1'2 PoSf � o _ 2as 480 3as� cf a _al t�rr�f PoSr 8 0 . 193 670 13205 cf 2 .21 Z'(Q 26v'Trc,� 9 0 .417 540 20234 cf 2 . 21 �n7Q.R4U�c.0 10 0 . Z77 770 13205 cf 2 .21 2YQ �I�l- 11 0 .343 550 20234 Cf 2 .21 (p`�Q.�1ISA't� 12 1 . 974 490 21066 Cf 2 - 21 1tR5�(R•Gf'r� 4/26/Ol 12 : 48 : 44 am Shareware Release page 4 PSEA&TP DETENTION VAULT CALCS FILE No_ 7976-VLT i .�;���' T�';r . ,_ �.�;'�,". i<�L`I'ANGliL,Ait VAlii�`I' li) i'vo_ I Description: VAULT {W/O 300} r,�.-i..}-}� . ^r nn �a �.T� -�� ', � Sft) ---cf-- --Ac-Ft- (ft) --cf-- --Ao-Ft- (ft) ---cf--- -Ac-Ft- {ft) --cf--- --Ac-F' I ___________________________________________________________________________________________________ 16.00 0.0000 0.0000 17.7D 2295 0.0527 19.40 4590 0.1054 21.10 6885 0.15�- 16.10 135.00 0.0031 17.80 2430 0.0558 19.50 4725 0.1085 21.20 7020 0.16 16.20 270.00 0.0062 17.90 2565 0.0589 19.60 4860 0.1116 21.30 7155 0.16�! 16.30 405_00 0.0093 18.00 2700 0.0620 19.70 4995 0.1147 21.40 7290 O.lE 16.40 540.00 0.0124 18.10 2835 0.0651 19.80 5130 0.1178 Z1_50 7425 0.1705 16.50 675.QQ 0.0155 18.20 2970 0.0682 19.90 5265 0.1209 21.60 7560 0.1736 16.60 810_00 0_0186 18.30 3105 0.0723 20.00 5400 0-1240 21.70 7695 0.1767 16.70 945_00 0_0217 16.40 3240 0_0744 20.10 5535 0.1271 21.80 7830 0.1798 16.80 1D80 0.0248 18.50 3375 0_0775 20.20 5670 O_1302 21.90 7965 0.1829 16_90 1215 0.0279 18.60 3510 0.0806 20.30 5805 0.1333 22.00 8100 0.1860 . 17.00 1350 O.Q310 18.70 3645 0.0837 20.40 5940 0.1364 22.10 8235 0.1890 17.10 1485 O.Q341 18.60 3780 0.0868 20.50 6075 0.1395 22.20 8370 0.1921 17.20 1620 0.0372 18:90 3915 0.0899 20.60 6210 0.1426 22.30 8505 0.1952 17.30 1755 0.0403 19.00 4050 0.093D 20.70 6345 0.1457 22.40 8640 0.1983 17.40 1890 0.0434 19.10 4185 0.0961 20.80 6480 0.1488 22.50 8775 0.2014 17.50 2025 0.0465 19.20 4320 Q_0992 20.90 6615 0.1519 17.60 2160 0_0496 19.30 4455 0_1023 21.00 6750 0.1550 4/26/Ol 12 .48 . 44 am Shareware Release page 5 '�, PSEA&TP ��� DETENTION VAULT CALCS � FILE No_ 7976-VLT --------------------------------------------------------------------- -------------------------------------------------------------------- STAGE STORAGE TABLE RECTANGULAR VAULT ID No. 2 Description: VAULT (W/ 30a) Length: 98 . 00 ft . Width: 18 . 00 ft . voids : 1. 000 STAGFs <---STORAGE----� STAGE r---STORAGE----> STAGfi r--STORAGfi---> STAGfi c----STORAGfi----> (ft) --cf--- --Ac-F't- (ft) ---cf--- --Ac-Ft- {ft) --cf-- -Ac-Ft- (ft) ---cf--- --Ac-Ft- --------------------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------------- 16.00 0.0000 O.ODOD 17.20 2117 0.64H6 18.40 4234 0.0972 19.60 6350 0_1458 16_10 176.40 0.0040 17.30 2293 0.0526 18.50 4410 0.1012 19.70 6527 0.1498 16.20 352.H0 0.0081 17.40 2470 0.0567 18.60 4586 0.1053 19.80 6703 0.1539 16.30 529.20 O_0121 17_50 2646 0.06�7 18.70 47b3 0.1093 19.90 6880 0.1579 16.40 705.60 0.0162 17.60 2822 0.0648 18.80 4939 0.1134 20.00 7056 0.1620 16.50 882.OD 0.0202 17_70 2999 0.0688 18_90 5116 D.1174 20.10 7232 0.1660 16.60 1058 0.0243 17.80 3175 0.0729 19.00 5292 0.1215 20.20 74Q9 �.1702 16.70 1235 0.0283 17.90 3352 0.0769 19.10 5468 0_1255 20_30 7585 0.�1741 16.80 1411 0.0324 18.00 3528 D_OB10 19_20 5645 0.1296 20.40 7762 0.1762 16.90 1568 0.0364 18.10 3704 0.0850 19.30 5821 O_1336 20.50 793B 0.1822 � 17_00 1764 0.0405 18.20 3881 O.OB91 19.40 5998 D_1377 17.10 1940 0.0445 18.30 4057 0.0931 19.50 6174 0.1417 I 4/26/O1 12 :48 :44 am Shareware Release page 6 PSEA&TP DETENTION VAULT CALCS FILE No. 7976-VLT --------------------------------------------------------------------- --------------------------------------------------------------------- STAGE DISCHARGE TABLE MULTIPLE ORIFICE ID No_ 1 Description: VAULT STANDPIPE Outlet Elev: 16 . 00 , •• Elev: 14 . 00 ft Orifice Diameter: 2 . 0771 in. 2 �� Elev: 18 .80 ft Orifice 2 Diameter: 2 .4785 in. 2�/z'� STAGfi r-DISCHARGfi---> STAGS �-DISCfiARGE---> STAGE r-DISCHARGS---> STAGB <-DZSCHARG&---> (ft) ---cfs-- ------- (Et) --cfe-- ------- (ft) --cfs-- ------- (ft) --cfs-- ------- 16.00 0.0000 17.20 0.1283 18.40 0.1814 19.60 0_3713 16.10 0.0370 17.30 0.1335 18.50 0.1851 19.70 0.3834 16.20 0.0524 17.40 0.1365 16.60 0.1888 19.B0 0.3949 16.30 0.0641 17.50 0.1434 18.70 0.1924 19.90 0.4061 16.40 0.0741 17.60 0.1981 18.80 0.1959 20.00 0.4168 16.50 0_0828 17.70 0.1527 18.90 0.2521 20_10 0.4271 16.60 0.0907 17.80 0.1571 19_00 0.2773 20_20 0.4372 16.70 0.0980 17.90 0.1614 19.10 0.2975 20_30 0.4470 16.80 0.1047 18.00 0.1656 19.20 0.3149 20.40 0.4565 '�.. 16.90 0.1211 18.10 0.1697 19.3Q 0_3306 20.50 0.4657 17.00 0.1171 18.20 0.1737 19.40 0_3450 17.10 0.1226 18.30 0.1776 19.50 0_3585 4/26/Ol 12 : 48 :44 am Shareware Release page 7 PSEA&TP DETENTION VAULT CALCS FILE No_ 7976-VLT --------------------------------------------------------------------- -------------------------------------------------------------------- STAGE DISCHARGE TABLE RISER DISCHARGE ID No_ 2 Description: 100YR RISER OVERFLOW CHECK Riser Diameter (in) : 15 . 00 elev: 20. 00 ft Weir Coefficient . . . : 9.739 height : 20 .50 ft Orif Coefficient_ . . : 3 .782 increm: 0 _ 10 ft STAGfi <--DISCHAE2GE---> STAGS <-DISCHAR6S---> STAGB <--DISCHARC�fi---> STAGB r-DISCHARGfi---> {ft) ---cfs-- ------- (ft) --cfs-- ----- (ft) ---cfs-- ------- (ft) --cfs-- ------ 20.00 0.0000 20.10 0.385Q 20.30 2.0004 20.50 4.3041 29.60 0_0000 20.20 1.0889 20.40 3.0797 4/26/Ol 12 :48 : 46 am Shareware Release page 9 PSEA&TP DETENTION VAULT CALCS FILE No. 7976-VLT LEVEL POOL TABLE SUNIl�IARY MATCH INFLAW -STO- -DIS- <-PEAK-> OUTFLAW STORAGH <--------DSSCRIPTION-——----> (cfs) (cfs) —id- --id- <-STAGS> id (cfs) VOL (cf) 2YR ROUTSD . .................. 0.19 0.94 1 1 1B.�3 8 0.19 3681.15 cf lOYR ROITI'ID ........ .......... 0.42 1.43 1 1 20.00 9 0.42 5405.69 cf 2YR FINAL .......... .......... 0.19 0.94 2 1 18.29 10 0.18 4043.17 cf lOYR FZNAL ................... 0.42 1.43 2 1 19.39 11 0.34 5975.18 cf 100YR O.F. CF�CR ....... ...... 0.00 1.97 2 2 20.30 12 1.97 7580.84 cf i � F I� Z y �'$�Fbl � S� �� �I�� e .���pd,��, � �.W�� �E �' W Y1 I � 2tl� I � � F 1�Lf j b I O e�t � 1 ��� � � '� '�1 r � � � � �� . 1 � �� bti�� I I � � Y!W � 1`,��J�..�� // % " � ,� �W I � ; : � n'. � ��q �• �� � � .,..: ... _...�.__, - -- _ --_ _ . _,_ �, � , ._ ___.. �,,`i j � ' nro,. ,.�o,� .._..._...._.,... " — _-. ....... , _. . � .. ,-�,...�� .� . l � _._. _... __.,. l iE ...---... ,rc ti , ss► , . .. m3o �w z --•._ ,, „- .._ —.._ __ ... . I ,-' '�� �1 _.. � I ..x_000i__. ,_ , '"t+, `, • r �.�. i _ __.._ � \ I � � e h-.�_...., � __ ��\ �`�� '��.,� n �� ._._.._ I � �� ��,� � � �� \ , F- ;�,�,� � ����\ '' ����,x � c� � � ��.._ ._..._�;,. a W ,i;, \ �;� � �, s� � ___---� o � � '''�. �` �4�`'�` �Lti � I W i�j4 (7F� ,��\k,,� ;..._._... _` � �'\. \ � J 6 ' � ���'•���� ��V'� � �� � �� � � �"'1 �4.,r � ��.��� V� i '\ 7 � / � .x`l, ;��• ;,\\��r � �� ;� r.._J ��a � Q .,� �\ ,rn . � ° �, �`, `' � � � ,::�,��\\\l� \� �� 1 0^' � / � ��\,� \� \� 4 f' 1� �' \, �'�\�✓ ��\� \ �. ..� � ��� f;?,.._----, \\_ _ J 1t ,\O �,�� �, / � .� A --�.,., I ,�..} ' � o _ � ' � � - ��,� ` �\ � �\\�� � i � ..`_-- � ���` �\\�Y \\�\\�� �• �• � � cv �� � pC� }�\\ � „ . t� I * � �� � :� �.�� fi. 1�_a�. ���� �•, °� ' �` � �. ���` � ..� � � � � —a � �I� ��� ^ � � �°� ab� \�•��� \ \\'�` l�`� ,��� ��� �, v ��`�'�' �� '� � �\ � �`\ � � � `� In K ��� � 3el ���.�� ' ��\ ��`�. �� � � W ` �\�\ \ I � �� � � � � C f`7 \� � I��r\ . �\�•� \i•``\�`���".� � �� �� � L__�_.� �� � O., `1 � I N �R y . �,( � �\.._.,, \�, -� \�� '°�p� / �� i � I � I � �� � r" � .\ b � � \ \.�, _ \\ � ..,, ��.(� I \\�\ ,`� ., �r / I �,y i � v �� b��`>° '� �\\� - ,'��� ,... /'` � ' �, f �..._ \\ � `:�\:,�� .�• i % I � � ;L, �t4 5 �� \ ��� �L�, • .6�� dC1�Ns, � �! � � � , ;�� — '� .`` �'—j � / � " � � , � �' .,�\��, ` =a :-�.\ _....., 1 � �� � .� ,..., � . _ �— ~ �'� � , . - .. . _ . -... �._.. :.., \ w..t� b ,� ,.., - � � �/ I� I� '� r/ �f"��,g��� �r•'�. " _. �@ . . . ,` � � c-�� , d, •\� ' , L .. .__• '"..' �..._., `-� -'-- --�-.--r. ..._,..._.�� _ �': �\ �_ -\�-�------- � _ ., r ` 0 l Np� - _, -- - � � .. -- - - , -� � --------- ,.. ........_ - -'---- ,u,�aio � _ __ .��: � ���� � .l`'�-. i.. - - --- gm_ ; - - .` � .. ... _ � ; _ _ ,, ,. .� �,`\\� �' ' 2`'� ��'• � - d � �•• �"�. � --__ � � i : ; - ;., " �� \� e e\�,• � J � �. , _� � '' . _ , ; �.. b b 0 � ' ,��� � � . 5a�..,��, , �b �� ---�..�...:--..�---�—R � g� , ��'b� �� �'��a `� � i �� � � \ � \� I ���� Za 20 \ � d . � '1 •1 ��i � i , � � � II� �) I �/��(��l .4 �. � !�h��i?Y?��r; � ��� .� � I�1��'�s,�;�',y,.,�if ���� �if I �It�� . � � �� �• �S�t�^����:`,�"-�`'fi I�1li �'L"� ;.. � � 1�z,.,-,��� y 4� :� ��� j� -� � � � A�} 'r �,��, �l � � , � �� �N. --- I �— 1�� � ��, `� � ; j��, � �� � �-, �-� �,} � ��>.,�xf k � h, �, i ` !11 � � '"��n.d m rV.< i �.I i �� �4 � \�� � � u�Y;p,� � .}i I. •}'1\ ''I' \ 1 Y�Y v `� ''r, Y�,a'U h��' � � �J I I �( i � �.`1 :tjr•» � � � C;� �41+:,r�i��. F:`! `��` 1\11 `U "�r � / ! � �� -*a � Li�!1 'A,� � � ( a`a`� ;�" � / / ll ' �l i � i � 1���� � h� t ; , -� �I r , _.. `�,,�\ ,�� ,���b ,� .,.._..�.�a �.. __ _. __ , _!'�__ _ ___.__ . , __ ._ . �—....__ __� ,= ' '�_ _. � i ; , _ �� -- , , _ L z �`--�- � ;;, ";� ..:::.... .... ���� , � �� �� � � � ` � - .__f � �\ . ��� l � ? .._ � 1� \ t1 �, \� �` \� .I � pi�.. .1 i �.____.� , � `\� _ _ . �� 1 � i � � . , � � � �� � � � ; { „� � ��, � ;1\ ,��i����.� Q C���s-,� �:� � �;,, � � `��� � `.� � . '�� \ . ,,, � \� ! � � � �, �1�\\`. \�\ � `�J "..,.�z; �' ,...�. ,J �1 ,°�....._.:�T.�_ �' ._;�._____—_._.—... V^" `_ �.��,�.` I � � �`�_ A\��� ,\ ��V���, ,�' �:i s�17�;�52/����.?� ��. �" __._._ ,�� `� �,� � � � (� � �r�\V���• � �r � �� ' �� � � �' �� � � F,-. �� ,. � � �� �� ! � +s 1�'''�;:\�'"�• \'\\�;\'� '\I� / > ,<' � \ `' n � ��'� �� "��\•�\ \ ,1`, �� `\ �I � \ �. I 5 E �1� I � I 1�.� h ;��z. �,�( ),,\\\\\1 Gj. . �.,\��\\ `,\ � ,��, �� / / i / � �\ � I ^(I ,1 I ,/ � \o� � :t I t;� � �� �,( ..\��-� \\\\r \\ „i�� /CU � f �X�� {. . .�;',c � ^`,.__ � � � , � -\,y����...Y�^'����,��\v \���\ i � ' y � , ��\ � � l� ` `,\ �.n I �' � r" � � �� ~�� �� �,;� � I �? � I � % \ \\���� \\�\�� I l� �' y�1� � \ � 41 .� �, II �� i I �,� � ( x � � ._� �� g��, �\�•.�, 1,\` � ''`� � (`; ��, � �,:1 ( � I � y M � e. \`��� `}. ; ,..r- r � \ ��I�� � � � �. � �\ � � I �.y 'r \) !` � ^ 1 �\� 1 �'� �� ' ` �� � � I . � � `' ��y.;;y o�i / �/ ' .. -"� ��.y;� ~'s \����! y \�� �..�� P � ' / /'r . .. . / .. "� � �%� 7 � ... � b' r�� �y�{ �� �� "" \� �� ���� �� � %�� � r�/ �� ' �/� • � ��'�7.,� � �� �� � � � i » 5�,, c�\ v��,. � � � � ,� � a �F�-�,�I �, .�� � �� � ' � , i ,. � „ �� �;. `, ��� ,� , �•-' \ � � I � ��;- ,5 �>�yv I ��,,, j � / �( �> ' / � � �y I IJI �„ � ��� \\ �� i ��4 �Sa\l.�\ h^\1 .��.., I.` ' S � �1^RN � if / '. ���r.' �/,/ / / � � � r� I I i u� . , , d � "V � � A�� V ��� � y�,',. �" 4��.5`� � ' � j„' ,. �� �� I ��y4 � +i` �� k'� \�� �> `\`�....._.,`\��� '` \� ��� y � ��� � ��� I �\� �� ( �i�� i e;a'? 'r\ ��;�' ��� � \� \ � �� �� �� � �r � �"� � " � 4,��'i r ' \\��`. ,��r \ �� C'(' !r� ' �"\"' p;� �\��._.\ , '.jx�\\'�'� c � � I / /O �.:� � t� ( ' I ��,; I� � �.,� � � \ \ � I i ` at�^y1 �\\\ � �`��.',,r � ? ~��'"�`"'.,.,,, � I �� . � bt("� i' c.�V, � \\\\ \ ��2�`��_�� , ���.�,—..:_..._._..�.,�__.� _ _____ �_--__. 1 �lT � I . �� , '� �.�` ��, :��" L ��, � / 7 y � � � , . ; ' k� ' �\ p,���\��. <_��" ,�� .,\ ` .,.: � � „� +�� � I i j '.1� `ta� . �._.� �;.� ; / �� - ``� � `- � �� ' � I � � '� �',� �~ � r;, '�, �\ � �� ,% �' � � >��� `�'�.._�^ x, � �, � (���� G,. , �o' �-....._ � .�` 1s�....--��� t� V o�u �� �. �a,;� - � � . . . _�_ /�__-- -.. �-•---�.......�"'--•.,..-.:_�c:"�..22.1...:J__ ._�. . . __...._....__.-- — � - --- �u� a � I F»s. i � -"�., �... `\ �' l bi ___. _._._.J.__.iL.__f--. —�'--,--- \�'`' _t,}� --.o �...__ __�_ �_..._. .�.—.::a�?— _._. _. _...... _-,,,:�. �' - ..._ .1 , _{...�_.._-------- ';-- � � �. - .. ...._ . ..1� I _ _� n o-�-- _....�_..__��.!�. .�-__._,_:�.,_?--.. ._ �_ t G9Z ,�t l0 ___�—_..r-- , -,a�., ..__.� ) _ _... _ .,�7� ;�,`� � �IT - � =} ..�.�.. .-� � �1�0. �_ . i � ^ � � -__...,...._�* -� �) �� - l' � l I� ��(� �.- \� \�,� � �`-,v2 � _..._.-.-,.._.._._�_ _.._._.._.__.___ fJ . _.....�. :- ... . -- , ; a �='� ��.�i�`�l����r�������a���k�fi"u�,� 1_ � i �..__ ( � � t�;�� � 5 ���.. � '� � � � ___�_,_ t �._ ��_� ,;' � , —�...._ _._ , , � r.. , __ —•. , „s, �•__.... � ` / � ��N N\ �. � � '.-..._._ , Y�r ��I .\\ y —..._..,....�.,, ;4 � '�.i I I l / ��b� \ q g� \ �\ �� ',` ( ._-.--.,,......_., ��`-� _..�_ \"� __._.,g:� � � � 20 ` I ( � \ �� ��iti� � 2l� ,4 � /� � , ` \ � I � \ ' U. S. DEPARTMENT OF AGRICULTURE SOIL CONSERVATION SERVICE 122� 5' R_4 E. R.5 E. sEarrts� ' 47°30' -- . 8�� ��. �:.�. �: �,= B — Ma � � . •= -• j � .. :: � �!�, :..:;,�s� s�o«a �. �`�si �; ' • t� � f' 't �• j.•= ' No 7 •� �` � j; .��� �D-• BIi 2V@I'T •,.t •� �� ,y` � � � '.w ' :�.`•" :�� � ••' �� . ;-�••.�- ..:.•• , '• '. f. ' S� f � ubsis'� $M� � • _ . f � _� • • ! �C t�: � —la-�; . , 0 . . ': • •,BeD` � O BM••�___ 'o, • • �../.,;,�: • � Q� j 25e'. . , . • . `�.: :� j � fCiTa + :�: �ti �` m � $CC. � - �� . • • :t a Q � . . - 8eD .. •� �Be,G. . ,:�.... W N (� ' . - . -� �... . _ _ P � •��•� ♦ ��9� b� . RA RowoT� " . , 5� t I-�r � ti' �Vo�. - ' � _�?Ap� i .� . i �. Ne.•� _ � � � � ' wo '� � : � . s �lo'C �..._ s� iC ,.. '��� wo � ,._ U� :_13--- , . Pi� py � N g� 8eC Goli�Cou�se � � '� i • Ur � a �f � wo j.o co � � Bi�i � f ~• � .�i ��a� ��= a� Sew ge pR1NE ' ,�, w �'� �Disp at N� • .; � � �p � ti W r � � � f�g Uf U[ r � • • •. `� j ., j f �_ . r� .� ,j ..: 3� . ZVr .s ij �,� �261 p„ 1• � . r,�*.�'s- � LJ o ,e,s�'� �: �`,� � Ur �' ' i � Pu � �kongdae�� • ,. , I F .o D . ` �, �� . .- .. � �� � • '�-�� i; Rye,€`;�,� py 1 � a ur�: - � ;�}' U� ��s 1 wo. � ,�� F u � o 'i Track ��.+' � �;�_ ��-�- a— �,� 1� �1�• -� A'� _ _ i'f' �� _ _- ' 27'3(Y' �' t� ' u. � Ur a � �g " ` R rvoir .� _� � � (} �� ■ r .f .�_. :; � �. � . � E`' . . SO� rU 2 n . ,� z � j � . i � t wo � ' 1. � � � � ' �2 �� ' ;� ; � .2� . SOIL CONSERVATIpN SERVICE KING COUNTY AREA. �n j SOIL LEGEND Tl.e(�.ai cop:tol 1<�ru �s.he co.wl o..e o(d.e so�l n . A seco.d coa.c� 4ne., n, 8.C.D, E.a F :.d:<o��:�hc<lo::o(:loy�. Sr^+bo�+.....tio...a s�.-'� i����. o.e�tios<o(neo.ty 1<.<I so:ls. SYAIBOL NAME � -• A98 Alderwood go.<Uy swdy looe.,0�0 6 perceor s�opes , A9C Atd<r..00d g.ovelly sondr loom,6�0 15 pc+cem slopes - - • Ag0 Alde*..00d qroveltr sondy loo�w, 15�0 30 pe�c<n�slopei Akf A�d«wood ord Kitsop soilz,very s�eep - � � A..�$ Are�+�s,A1dsn.00d mo�eriol,0�0 6 peicen�slopes� �,� A�..� A�e��s,Aldei...00d ww�aial,6�o IS perum slopes• . A� A/lMZ�E"Htti,no1Nw�� - Y� 8<C •Beovsi�e gro.eily su+dy loom,6�0 15 pc�ce..�slopcs - Be0 Beovsite grooellr sondY loan,15 ta 30 peicenr sbpes . MF 0.—s..::•e !�=_�.'.;Icn_..<p:=' �-:c_.:.alo„o: 1 ' 9.e.c� BF, Bellii.ghoin silt too�n i ,.. 8r Brisca sih loom B.. B..ckle�•sGh Ioo�w t.•�••� Cb Coostol Beoches _ ••• _ Y... Eo Eo�tmon'sitt loo'w . Ed Edgev.:ck(:�e sady loon. � '.-••••� Ev8 E�ert qiovelly sondy loom,0 ro 5 pe*cent siopes � . EvC E.�.���9.o.Kty:w,dr too.,5 to 15 pe.ee.n slopcs - . . •••. Evp E�e�e�t y'o.elly sondy loom,15 to 3Q pcvice.w slopcs . i.-<... EwC Erer<n-AMelwood yrovelly sondy tooins.6�o IS pe+cen.slopes - . InA Md:orwb loon.y flne soid,0 ro 4 pefeen�slopes � - ,~ r InC Md:«+oia looe.y f«.e sond,1 to 15 pc�ce��stopes -- '' inp Md:enob too�fine sond,IS�0 30 percem slopcs KpB K:�sop sik loww,2 to 8 percent slapcs - Ii...1d � KpC Kitwp s:h loom,8 fo 15 pe�cent zbpes Kp0 Kitsop sih loo.w, IS to 30 pe`ceM slopes - � %'�"•, KsC Klovs yfoveily looiwy sond,6�0 1S pefcent sloqes 1:...1d Mo Mixed ol{wiel{ond � NcC . N�ihon verr yrovelly tooury sond.?�0 15 pe+cm�slopes " � '"'-� Ng Newbery sik bowi Nk llooksec4s:hieo.w '"�-�' No Na.�o sadr too1w . . .. . . ... . Or Orcos peor _ ..,. Os Or:d:o sik too1n . Q.0 pyoll yrm.ely loow,Oro IS perceru sbpes OyO O.�oll grovelly loos, IS te?Spercent slopes aF ob����y�.�,eo�o n�.�����: - . :.:s - Pc Ptklwck Wo.ny iu.e wnd P4 Piklwek r:ne sond�e.tooiw i�•• Pv P.yci silry cbp(oo.n . Py R.roll„p(:�.e wndy loo1n ' Ro� Roy.wr(:.�e sondy loo1w,6�o IS pe.cen�:lopes Ro0 Roqno.fine w.dy looiw, IS�0 25 perc�ro slopes -� - RdC Rognor-Ind'anole ossociot:on,slop:rg• RdE Rog..or.l.d:onob ossx:o�ion,.wdao�eiy s�eep• -' � Rs HsMon sih loon. - - R1. R:.e..wsti : $o $olo)sih loc.w y. $o..�noi.:s1�s:l.loorw SA $een1�wti.cl S.� S�wkw wh.c6 S� S:s:l� loo'.n . $o y.olw.nisA s�h Ioon. $r $nolw.eisA si6�oo..,�h�c4 swfocc.w�om Su S.�ho�s:l�loc••• � T.. T.,4..:b�.<=. � tY Lhbo..Io.�G ��y\�tJ Y.'coc:m.:tE!!.Ir IcoT � � l l.r toTO�•••:n o�•'•tse. ..s .s.....e. w�l..M...M..d.1..�.o--. ....M aeo_�..� ..I�ea: ....•.�.<iteC.-.•It.�..���....«.�<.c i.I.i . � t.�.•�•rd.•Se ol.l.' >:•`t KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL (2) CN values can be area weighted when they apply to pervious areas of similar CN's (within 20 CN points}. However, high CN areas should not be combined with low CN areas (unless the low CN areas are less than 15°/o of the subbasinl. In this case, separate hydrographs should be generated and summed to form one hydrograph. F1GL'RE 3.5.2A HYDROLOGIC SOIL CROUP OF THE SOILS IN hING COUNTY NYDROLOGIC HYDROLOGIC SOIL GROUP GROUP* SOII GROUP GROUP* Alderwood C Orcas Peat D Arents, Alderwood Mater'�al C Oridia D Arents, Everett Material B Ovall C Beausite C Pilchuck C Bellingham D Puget D Briscot D Puyallup B Buckley D Ragnar B Coastal Beaches Variable Renton D Earlmont Silt Loam D Riverwash Variable Edgewick C Salal C Everett A/B 'Sammamish D Indianola A Seattle D Kitsap C Shacar D Klaus C Si Silt C Mixed Atlwia! Land Var'�able Snohomish D Neilton A Sultan C Newberg B Tukwla D Nooksack C Urban Variable t�lormal Sandy Loam D Woodinville D .E� HYDROLOGIC SOII GROUP CLASSIFICA710NS A. (Low �unoH potential). Sals having high infltration rates, even when thoroughly wetted, and consisting chiefly of deep,welf-to-excessively drained sands or gravels. These soils have a high rate of water transmission. B. {Moderately low runoff potenfial). Sols having moderate inf,ltration rates when thoroughly wetted, and consisting chiefty of moderately fine to moderately coarse textures. These soas have a moderate rate of water fransmission. C. (Moderately high runoft potent�a�. So�1s having slow infiltration raies when thoroughly wetted, and _ consisting chiefly of sols with a layer that impedes downward movement of water, or so�s with moderately fine to fine textures. These sals have a slow rate of water transmission. D. {High runoff poteniial). Sods having very slow infiliration �ates when thoroughly wetted and consisting chiefly of c(ay sals with a high swelling potential, soits with a permanent high water tabte. sals with a hardpan or clay layer at or near the surface,and shallow soifs over nearly impervious maierial_ These soils have a very slow rate of water transmission. * From SCS, TR-55, Second Edition,June 1986, Exhibit A-t. Revisions made from SCS, So�7 Interpretation Record, Form #5, September 1988. ' ��n 3.5.2-2 11/92 ap, KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TABLE 3.5.2[3 SCS�'VESTERN WASHINGTON RUNOFF CURVE NUMBERS SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Pubiished by SCS in 1982) RunoH curve numbers for selected agricultural, suburban and urban land use for Type tA rainfall distribution, 24-hour storm duration. CUAVE NUMBERS BY HYDROLOGIC SOIL GROUP LAND USE DESCRIPTlON" A B C D Cultivated land(1): winter condition 86 91 94 95 Mountain open areas: low growing brush and grasslands 74 82 89 92 Meadow or pasture: 65 78 85 89 Wood or forest land: undisturbed or older second growth 42 64 76 81 Wood or forest land: young second growth or brush 55 72 n� Q Orchard_ with cover crop 81 � yz 94 Open spaces, lawns, parks, golf courses, cemeteries, landscaping. � good condition: grass cover on 75% or more of the area 68 80 86 o fair condRion: grass cover on 50°,6 to 75°�6 of the area 77 85 90 92 Gravel roads and paricing lots 76 85 89 9l _ Dirt roads and parking lots 72 82 87 89 f mpervious surfaces, pavement, roofs, etc. 98 98 98 98 Open water bodies: lakes, wetlands, ponds, etc. 100 100 100 100 Single Family Residential (2) Dwelling Unit/Gross Acre °�6 Impervious (3) 1.0 DU/GA 15 Separate curve number 1.5 DU/GA 20 shall be setected 2.0 DU/GA 25 fo�pervious and , 2.5 DU/GA 30 impervious portion � 3.0 DU/GA 34 of the site or basin 3.5 DU/GA 38 4.0 DU/GA 42 , 4.5 OU/GA 46 5.0 DU/GA 48 5.5�DU/GA 50 6.0 DU/GA 52 " 6.5 DU/GA 54 7.0 DU/GA 56 _ � Planned uni[developments, % impervious condominiums, apartmenfs, must be computed commercial business and industrial areas. (1) For a more detailed description of agricultural land use curve numbers refer to National Engineering Handbook, Section 4, Hydrdogy, Chapter 9, August t972_ (2) Ass�mes roof and driveway runoff is directed into street/storm system. (3) The remaining pervious areas (lawn) are considered to be in good condition for these curve numbers. � 3.5_2-3 11/92 • • � . . . � . � . ��,',����', s � � ' �. . , ���-,:���t� , ;�I. � _�� ,. ' . ��►. � : ��' �� • .�� - . . ����� , � � r .'' ��� r � '��� � , : ����� :• � � �����' ,�.�►�f ��;�' � � o . _�e���� � �� ��—. `,,' .. . �.■..l�. E � � ���.��`1� f ` ► �,�} �- �,�' • ���iy, i�� � �! �..o.-� � �� .�.., ,E � r�► � .� F _,_, a ����...�'':�� `_ '_� i►��� �► � + !►�, E "` � ��i1 P , - � � � :� ����� ,� /); " ! .!� 1� � ..�!►. „��., ,� �, �_.`�� t�"ii� - " '�. t'.y��:�i� ��a��S:���� o' � "� /� • �\�'�%,�i� • �Si�ll ,�������/ +'�.�� �"�'�:�f�L �����"�" ,� ��`�� / 'w � , J �� i1'��� , ' �'�` 7;` _ '�-- ���t�;j�l�(i►���l���a ��� �Y; � ��`� �//.r,���w�w � o � :�!��^.����j��i,. �;r � ,�� 'i� 1 -i�►` _,��'��'�►- �- '1 ,��l� , 1 y �� �,�-t�►'�''� � �i� ��. ��i►�, r.1t►.� . ..,��� � � � � "_ ti 1 �. ,. � � ����� -- !�1l,��.�I� ,.. � ':'� �� �. ,� ,� �,� _ `:o� ,�.� �'�, � �.1��, � ��,,�:. , ,�.1'�,,, �,� . .,�4�.�_ ��" � _ ��ri��, �i�,- �►. `1�Z�. 7 �•►� �� � ���:� �,��;, �+�r-. � _ �. �!t���,�� ��� �,,���E���ia� � _, e���[R � •. ,�. �. 11►tR,�,ll, t�i���'� `���j .. � J I�\�i=.�lAT3�. e• �1 �i ���`�� � w � � :' q� �ak �� - �;� ��� ���i, ��'��f�� � t�+�, �, ���� ��� ;� � ri� _ �� �,,�. ��✓ � ��t �■� � • � � , _� ��,4� - `����w�! � ��'s �, ��� � . A 7;. ' ' � �;�' �i��'lc����� �1•.i►'�r�`;� - ► /�/►� � �, _- � r,� ,�/ � ���� i �!_��� �i �� 1 �i � �i� � �J � .����li�i� � � ,� � i � � � � . �, � ,�►. ���j � ��� I��w� / � ��S . - _ � ---� �ww�� �'�,.�,�j' — • . ..� : . ` � ,�� :..:����� _ �._ ` �'_ �� _ . �� .. - ��i ` �� 'r � � � 9 ��� .� � �� ,�� . �i , �.. ,; ���; ;� ,.��r' , t,�� ��, ,r ��; �■ A <� � �� �.. �' • . �►��� �. = �'it�/lil��'rt�l�l�� , . , , . . . . . . ; ''���.f'�I��� ., , •,��� , , , , r��s�.�;-. -!' • � ,�,;w�►/1'�r .- ��� . — �, .. ��� F. 3'r=�,tt � • � � . � . . � . � . . ro�rw Rd.' ci. � � ��. , �, ! � �����'''��,� r�� � �• > �' 1 I �!�'� `''� ' `' ��. � �'� � . I � �� �: `,r��., ` ' i . _ �� .. , - �1 •nn ��� � , , �.� � .. � . _ ���'�� � �-.� ��� '�,i • .�.��_.r , � � � . �� i !��� �- • `�`�.I�'r��C ' r*: :iA + e!�t ��f~ '����,s%!� � v 1 �� ,'i� �'� ��' �jr����,��, � ' �� ...��:�� � E���m.��i � �, •..����� ► � ��-�/ � �� ����E"' � �i' � � ,` t , °.'i�i � > ; ' . ��, � �� *� �'� �,— � l/ �r.�. � �,� � �\� � �. `.'� ,7�� �, y� �r �� ��,� � �y� '` t����_ � . � rr ' �.- � �_ `�`�� � �•���. �� '� : � �-,�,.t�►� ..�I � �� , ��� � �'��R �� �i� �� � ���v '�� �l�'� � ,��;= _ � ��� � - ��� \ ;,� � � ��► � ''� �� ��� �1��.., � �►� �-_� � �D � ���� � � ��� y � r• . ... ',{ � `1��� ~� '' ''''� • � � ��� . ;:, .� � lti�� � ��, '� �n�R �,�- • t ;����� !e'A�. —�' 1.� � _—,.Ir, �,, , .A�� t ���. :� ��k � ,� � �� i� ��I�ir _ � ' '�� ; � � . ��� � - ~ `\ ✓� � �1 �� �� � ,� � � r�� �Iil� � � � � 1 �� ����, - ..�� � �g�. �1". � ' � � A� ���� r ,�r � • `=' ������ s •� . � ���j� �•,1��%/� � �� +�A`�i�(�� �*`� � ' �� ��� �� �� ,��� ;� � - .� - / �iw■�'i�� �= .,,� -- -- . � � i 1 , .� . � �r.�� .��` � � ,��� �,,.s�.�,� _ ► , ! ��i� t� ��� � . .� �► , '�� �- •� �� �r �. � ,t�� � ` �� �� ._ � � �i. ,� ' �- as���:'��i�l��� � , . . , , . . . . , . 1.��/l t��1�!i�� • w��e►.r,..� . • . � . �,�w•��•• ��. _ � . . . . . �1����r' , � � � �� � -------- • , ',�,��,' ., .,, + .� • � • • � . � . � . � � � . ���i��N� ���� �� � t ' y;:�-�i��.��'•� ;��i�/ � � � �� -",-,1. �t `, � ���`�� �' � �•w+r • ����� �� � � • /► ,r �� �' , .��j����� �� � O ` G�� � � � . �� � t ,��,�� �� �� � �ia ����wP� � `�=� �'�� . ,�i ��,�' •� 1 ;-. ��.. , - �, ����`�' y ������ t ..�' ,�� /M � '-� + �� � ' ��'?'4+l� .,.II/�� �'�P �� �.. -_.��.� �� � � � �! '��:� �� �(���-��► � .� �r��'" � ,� E�..�w.�i�►�� '��� � --������ -���:_�•*�� � ��'�l� ,.,_ . �� .� �.,�,�! ,..,._ !�-, ,� ` �, �i��,, -.�a���►,�.�� • tf , r' -,r�h �� ����� I d� .�''�,- .��1� � �� i�7�!, "���r��� „�r,�,��.��' �� � �� � - .. ��.� 1_ � � ���► �i,,,` �� ���� `�����►�► ��� ,��nf� � � , +. . -- t��,�_ , �, 1 � � , �a;, �,- ��j�, � � � � !, .. . ' �E► ,� '��, , ,�►��4 `� � I • � � ��\ � • \ _,,�� � , ���' � ��1� - ����1�`�_ • ' �.I��/,/ �. �� 1 �\�, .y r \ � _ � � , i�AI ��=�� � j1� ����� f It ll�"�t, �^���,. � �� ���„�1�".r'����'._\l�� ' 1���'� ��. � �M�� � ��� � - � .� �� • ��, � ��.*�iiir � '� . I ' � <� , •. �. � , � ie � - �\ ''�� ,� ��� , � � - � f ��sw�� �� . ���►w '� .�` ��1; �t ., �`�'i�� �l�R � t- �i � r;� ��G'!E� �� �;'��'� � ��1� `���/� ���� _ 1,��- � ��i�� ,v �: � ; � ,�i�� , �; ,� � � � ,�, , �, �_ ,. .� , ����� q��_ �,� _ . � ! y . � �} �'' � ,�,U ;�r.� ,� ..., , ._ IC ���• �•• •�� ��� � �i� - , � � ' rII , 0 1 ..� .� , � �� ��� - �i,� �� �.�� �^ . y � f :. �� �.�, _ r � , � A � � . ��� .�� �► `�� , � ' - . ��r�.�e�E�i� ., . . . . . . , . . 1 ��/�t�.�!I�ri�) - . � �� w�r�Lr�r�� � � f • � � ��� I„'�� . � ��� � . • • � � i .� • — ♦ _ , ,+ . ... • � � . �� . . , � . � . g .�,�w � �� : �� ��� ; � � � ��'�:l1 � '�l► r,y �� �. - `� � o. � . ���t ,� , . - ' �l�r � t . ��.� � �.� _ : . �� _.� ��. � � . ,�;,��r�__ � �� E �, . � � �sl��!�'�y e - �� � — � . ��;� � � '.��i�`;aI�S�F' � �►....-� �. Is�A-�:1 � � � ���°� � � ��r� � � , , --�� ;'`' � � . � � ' � ��� ...�►...��.��, �,. .���_ .�.. ,�-��' �;���, �� �� ����.��.� ���./ . • , •%���3y ��;��, 1!� ; , �' J • � ��.�.� ►"�r�����` '��� � ` if��' f�:,����•�•��'i' '�'c�..�""":..'�.�r'�' � � �� � ��� �L' � l�! �/r.I��� ��:� � _ �,,,��^ , �j �` � � � t J ��. � �� �f�o�-���►r �'i�- ► �+ , � ,�� r► �`�� ,�+1��1 - ���� t �'.�!��' �- . , ... � .� `�t =��� � u� ,� :.� .�:. ,;��. ��i��lr� �``, 1 � A� �� ;� . = ' ' ��%�" <. . �.�r�� � 4 � ..���,. , .� _,�.� _ . ���� �,, ��,_ �e���..� - �..�,�� �� . � ,�, � -. . ._ ��� �� � l�.� �.�1.�..'!�l �► E _- '��� �.. 7! ,���,;���,,rx�� ;,{������\�� - -. ���, ���i�sR ,,,f t _� � � �i�' �►�,�,�� �f � �� �.�:� iU�� � ,�!�;���'�►���� `�.`',�*''�'`�;; �1� � .�. , �a� � � � � �� � �� g . .k � � �.. w_ '��'i '��`���' ,I��� � '� � •� � 1 _ ��� � �� !i� _ � - �'��, � � : �► ��t �'�'�1 �i�r�'i � �.� � � `- �� _ - � �i�,� - � ,�.��w �� �,� , �� , , . �, ; � . �_, �►� ,� �;, i �� � � � � .r;:�. .�.��r���- ,����� � � r� ''� '� ���� ; ��.��� � 1� �-�,� �� �� ,t ��Af�i�u11� '� �, , �, ; /���� � , �,. �� _ � �. E � ..�'�'�/.�—"'�-�,w!� '�� ,�� _- _ '� ` �. l !� i1 �� � �/.���� ' +� ��,'j�'� � '• '� � :,�o.��� ��� � �� ;�� �� �,F _ ' �� ,� , o o ��ii. � -. . � � `�� ; ��r► � ��: r�^Fi �� ! ��, ►- � ��; ' �s �� ��� ;, ,;` '�;� . . . ���i� .r . , . � ��� • . • ii/�t'rl���� ., � � ' - • ' - • • � • �'������ � � `0 . ,� �� �_�; � . � . � . �� . . , /�►R.r � . . . � � �������� ,- . :'�•'= . . —_-, -------- ► � �� e .. ..� �� �� ���5� � -��i �l•� ' � � 4/26/Ol 1: 0 :20 pm Shareware Release page 1 PSEA&TP DETENTION VAULT CALCS FILE No_ 7976-VLT --------------------------------------------------------------------- --------------------------------------------------------------------- BASIN SUMMARY BASIN ID: Cl NAME: 640 2YR POST-DEV (WETVAULT) SBUH METHODOLOGY TOTAL AREA. _ . _ . . . : 2 _21 Acres BASEFLOWS: 0 . 00 cfs RAINFALL TYPE . . . . : KC24HR PERV IMP PRECIPITATION. . . . : 0 .67 inches AREA. . : 0 .42 Acres 1 . 79 Acres TIME INTERVAL. . . . : 10 . 00 min CN_ _ . . : 90 . 00 98 . 00 TC_ . . . : 8 . 81 min 8 . 81 min ABSTRACTION COEFF: 0 .20 PEAK R.ATE: 0 . 23 cfs VOL: 0 . 08 Ac-ft TIME: 480 min 4/26/O1 1: 0 :20 pm Shareware Release page 2 PSEA&TP DETENTION VAULT CALCS FILE No. 7976-VLT --------------------------------------------------------------------- --------------------------------------------------------------------- HYDROGRAPH SUMMARY PEAK TIME VOLUME HYD RUNOFF OF OF Contrib NUM RATE PEAK HYDRO Area cfs min. cf\AcFt Acres --------------------------------------------- --------------------------------------------- 2 _ 7 490 12652 2 .21 3 0 .696 2 cf 2 .21 4 0 _ 938 5 cf 2 .21 5 _ 9 480 20234 2 .21 ��j7 0 . 228 480 3287 Cf 2 . 21 � S'���'�l �� C��`'i�� 9 . 540 20 2 _21 10 0 . 177 7 3205 cf 2 .21 11 . 550 202 2 . 21 . fi►-sD �£E�t(.� �3bL�5Mti. � US�c.�1�-"�: —PRoP+��aJ l t+�J�Pv. �f�A �a�2�C1'�i�2- �� � �'• — No �� �0�2. $tos� - tr�l �Q�� v�f� ��u�� B1' t .S Ta Fa�e- r� F3t��.s�ac�..� . — �,�28'1 X 1.5 = ��93D.Sb � �Q�D _ vot-urn� 'P�R-�1� � ��Z�2 � U� . }�nsA S��FP�z-� P�4� �r '�•. �'c� = t% o� t w�c v �aFt�t.� _ �1�,`i�2 x 1%. ; ��0 5� �-�2a�n�_ �g' � �8 ' = l ��b4 sF oIG V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN Enclosed are typical calculations necessary for sizing of the pipe facilities proposed on this project. The rational method and Mannings formula were used for sizing purposes. Conveyance pipes have been sized to accommodate the 100-year storm event at the flowing full condition. The intent of the pipe system � within the parking lot is to convey stormwater runoff into the detention vault. The proposed vault has not been sized to accommodate any off-site development. � 7976.003[DED/mm/lcn] �s�s BARGHAUSEN CONSULTING ENGINEERS-PIPE FLOW CALCULATOR using the Rational Method&Manning Formula KING COUNTY DESIGN FOR 100 YEAR STORM JOB NAME: NOTE;ENTER DEFAULTS AND STORM DATA BEFORE BEGINNING JOB#: 7976 DEFAULTS C� 0.85 n= 0.012 ' REVISED: 3/15/01 d■ 12 Tc= 10 Am Contributing Area(Ac) Qd=Design Flow(cfs) COEFFICIENTS FOR THE RATIONAL METHOD"Ir"-EQUATION C■Runoff Coefficient Q�Full Capaclty Flow(cfs) STORM At Br Tc�Time of Concentration(min) Vd=Velocity at Design Flow(fps) 2YR 1.58 0.58 I=Intensity at Tc(in/hr) Vf=Velodty at Full Flow(fps) 10YR 2.44 0.64 PRECIP= 3.8 li d�Diameter of Pipe(in) s�Slope of pipe(°�) 25YR 2.66 0.65 Ar- 2.61 L=Lenflth of Pipe(ft) n=Manning Roughness Coefficient SOYR 2.75 0.65 8� 0.63 D�Water Depth at Qd(in) Tt=Travel Tfine at Vd(mfn) 100YR 2.61 0.63 FROM TO A s L d Te n C SUM A A"C SUM A'C I Qd Qf Qd/4f D/d D Vf Vd Tt i �asn�� �s���a oeaeae �000am aaaoa� axx_a aa�eaa ea�:�: a�osam sea=so sasexs =�=�eeat�aesas ae_amx xco=as szeco= saeQ�r s�oams oa=oav cx=sc= xmemea �', C86 CBS 0.47 0.62 97 12 10.0 0.012 0,85 0.47 0.40 0.40 2.39 0.95 3.04 0,314 0.383 4.60 3.87 3.42 0.47 I CB5 CB2 0.56 0.62 200 12 10.5 0.012 0.85 1.03 0.48 0.88 2.32 2.03 3.04 0.668 O.S97 7.17 3,87 4.14 0.81 ' C84 CB2 0.37 1.00 97 12 10.0 0.012 0.85 0.37 0.31 0,31 2.39 0.75 3.86 0.196 a.286 3.55 4.92 3.78 0.43 CB3 CB2 0.34 1,00 85 12 10.0 0.012 0.85 0.34 0,29 0.29 2.39 0.69 3.86 0.179 0.283 3.40 4.92 3.71 0.38 CB2 CB1 0.48 2.39 66 12 11.3 0.012 0.85 0.48 0.41 1.89 2.21 4.t7 5.96 0.700 0.617 7.40 7.60 8.23 0,13 C81 VAULT 0.00 2.39 28 12 11.4 0.012 0.85 0.48 0,00 1.89 2.20 4.14 5.96 0.695 0.613 7.36 7.60 8.21 0.05 VAULT EX60" 0.00 0.50 40 15 11,5 0.012 0.85 0 0.00 1.89 2.19 4.13 4.95 0.836 0.697 10.46 4.03 4.51 0.15 i ge 1 I � ��j��j;� I � � f� � ,�� / 1 JI� ��?.y � � /���; Ii I ���f/� III 7q1�$ � I�+���b,,, �� ;��� ��� ��� �d��r���� ,� � 'xwr�u '� � 1„ �'� � �y,'k' �/�`���`4I tl ..��.X� � « - � }_~� `�y1 20' '� � s l . � f4 �� i� I'; � >� � 4 -� f'I t �-? ��i , } $ �w.p � � �.ti jJ\ I�'�'I I y�w' F F.'u..Y..° �� i� �_' Y �`11�` .. �i r. , , �� ,;� �� �I � ; y�., � ., ,lu�, ��� ,, .,: . <<�. '�� ' 1 ' �� . � : , , V 4,�� � m � t���-� �.� , ,- � �;;q �,�,��� � ', } � � ,� �3�� �r 1,�}�11, 1, . , � r.. __------- � _.. __ ; � , ; J .._..�� � i .b 2 3 I S..-- 1` � ni J._-. '-. 4I � tC� � 1 2 � ' . . , - __ - ,... ! `�i ` ---�,- _. ,, � • F � ��, ` % .. � - - ... ... �,�._ � � I ! r - ._ - , .._. __... _ -- �._ �� V �� ,-�•/ � . 2 � �� . . . � . .. . J } `u�nr� -��. � y �� �A �� „ .�� � � • -•� '. • . � .. � !1 � f �� �,� ( �j �t� � . � A�V � �� .A . �:� , � � � ��= ,`;�;�` ���� ;� .,� L, ' �, `��; �; `- �:�. � �\`\ \\� I ; j i-- i � _ � ti1\ ` �� <s r��'1 -------�--- --,-----�.. '� _ ____-__ _ �. W i -��� �, � .,>� �..�� _ , � � '� �. � - �--- � i � � � , � ����\,:�A °1\,�` � A _ ,;, � � , �" "� ��, �, � � � �� , , � r �r k��.� � ��r ���,�� ����� ��,� �',� i i �, �� �� ;, � t�- � 1Ly `'� �\\\\' 1\\\�� .` ��t �' � � � .'.'������Y Y ' � /� � � \ � �,' f n�.:C ��\���� �� { � � : � � I \...•��� ��.r �V\�� ��V� �V /�� � � /: �Yl � � � � � } ��' � /� ��. � ✓ �' \,� � ��vn , � �.r / I �.'\ �� � �t � � � '^"� _ . . � i . . � r � �� . \`.. t� -�, __.l r,- � �L.?p , _ \,\\ c�� . - . i ` � . i ._ .. �c . ,. . '�� .\ � I ..�i � i � ��,... � '^ ��\ G V' ) � �.� A � �� � � y; � Il_ ��x i r'� � � .:ld' �\, , `� \ � `�§ � � ,...,:� '���7 \��� � � ;,� `. r�� . �r � A �` A �� f� i L � �� ,�' 11�! \� � � n - � � I h/ \� � J r �. �- ��� . � I i �`�'"_..�. . /r`� § /^ �\d'. �\\\ `� � \ � 1 .,. , � ;t f � � I� � � ^ "�, (, � \\ ,�,. � ���� r . � � I �� .. ��O ; F,� I I i I� I � __ _^-- 1 `�tS �J �� \`�� ���.',�;, �,�.� � � . . � � � {}�j�� � ��� � i �'•F,�.� �� � \ �i� \�•�� Yr � ti'�,. � s �'�.� / � i��� � d: I � I vi � i k� � � � '�� Po"�'� '-^��� '� ;'�' / '1•. i// � � % / � I�I I � �G � � I " _,} � a. �, � , y%�\�q � . , � V ��� � � .. A�� � P � % , / � ��� i � � I � � � _� � � `��� � n , - ,. V ' , ,^ \ �� � � �.�� ♦ � l.{ � �� . �'t Ii' � � ,) i u I I ,: �..`\ _\ %. ( �cJc, ��.�\.�'�_, r .�'. 4 . d� +� % � .. � %�n p:, i: i l, t�.i ; iti„', ��� � ' � � -' `\�� s�, � _ �� ' ��1 t ?Yd.:1� � � � , . �.- ,f� �/� / j � � �� � � i �� '�1-,` �• `V� ^'�_ \ � .` `> '�~ '7� --- - � �� I � � i y � �;A ���^ `,����'�. '� I ' \..\ \ ^\\ \ \�4.h� � ` , \� \ 1i. �y I .y��1.� rr� . �yy�� �4 � I t . '� l ���,�^�, �t � I '�� . , � "1 . I � w . t 73 ��� �� �''� � \\��� tit`��`'}� �' �� ^ i � I I C b � v� � �•-�'"� A�\\•_� �''�Y,�� � � � � � / i� �� i� ( 'u'� � �s�. � e,�1 i ' N �� ,�� \ � �'� .[ �.- � `� �� ��/1 � � I � / �I� �.� � -I � /� I i � � (�1 � �.. I . �ri', �. . . � ��<, ��� �I `� \ �•. '� _. ��r' � � ' - � Q �' I '" � vn I �✓� ��"'� , .. �-� ` `�� '---i--- ____._ (' i, �/� i 1 �'� _ -- ,.Q'�A . , w,,• `�^ �� ,`�'� � � .ys.._,r-� y�y� ' \� �'•'� � � � �� I{ r i I �� x �rL I ��\ � '3 ) �� �I � I <J � ,� ��;r��� �� �.� ,� �� �.- �� �' ;? /r i 1 i . • _. �] ��. 1� � • �- � � , � I ��Yy1�{� ` rL, ^� _.{._.. ^G�\y / `\ \ ��r..�M F��J,_ I � n I � fX'" �� _....o..�_.._._.__.,...__./.�.._�._.. _.___,�.,,�-v�---� `"r _ ' �--_-'-�_ ('____._______ 1 ' _-�'-' V � - - �� � � � � a I;:,3# I --•---�-�--,zzoet p.ct,t4t "'`'_'"T"')`/- y -�'E�' � I) �;YJ..""_"__ _ --- '- =�-_-��_- .�. .�-:+��_-_-- -- _..�_-��- .__...___ i � �'�,�� ( �` ,. - , _ � � � �'� / ' -�� ..__ � •�'---------� - - " / / �-• �FR ' .� ' "�•�- ..��� � `� ( ' � ""-_1 � � �/ ��e���� ,h \l. E E���,i2p �...�. "---� —___ / � � 1 ky e, / - r �a ---_,-:�..._ _ ��-'1�A�,....-0-i... � � �/ � �� � ��` \I 5 c � ^� �., o � r� ' � u '( � '.,,, _.. � �� � g� 1 � ..._"_._.._....__. t� � � y f d � \ � �K� }I ��` °.a��� 1 ,�q 1d , n \ ..h-�__-_.�rJ ` ��' I � �„ Y '� � VI. SPECIAL REPORTS AND STUDIES VI. SPECIAL REPORTS AND STUDIES Miscellaneous reports and letters have been included for review. ;�1�'��.IHl3 (I>I�:Il;�mnv`kn) VII. BASIN AND COMMUNITY PLAN AREAS VII. BASIN AND COMMUNITY PLAN AREAS The project is located within the Green River Drainage Basin. The community plan area is called"Green River VaIley." 7976.0�3 [DEDImm/knJ � W a � � ' z ^ r: � .. / ^t' /' � rY Z Z � ��� � �, � = Z � � � �� � ;'�!`,+'' �i� < (�''���:�;:'ti�� rl � '" .. . .�'3a...'� l y� O � p� � � � �'r '!_.1� .4�'.'R'� �i � � [ 1 UQ� ,.. i._ � .� �.�,c �,r..�' ,'P� g� /� �, '�.. " � � ��r� ( v i�i� I n�_ � ��I� ' �t+� �f— � j 1'�^ � � X I� !, � �, _ - --,..c:`��' ,��,�5 ''3�� J�,`i �y Z► � a � ' ,� ' �I `, `� � � � ' ~ � lfr "� R 1 ���, �l� �„�;,�-�� ��; � �C Z o � '�'� � ,,� i� � � II, :. �,, _ .tf' i ,.�, ��o jr .. � �/� I i \.., I I i I . � y/���if �� �r�� �c . Ij � I �� �r �:� �� �Y � a� C j i'� �l \\ ,1..r'7°7�_� 1! � u i-��� �`'1 O ` . �� I - \ � �;5�� ...., /H ` 1J I l r o� . i ,t.. W� 1 t � ''�—, , � '� , r�r,�' V ��,. ,\ ,� '�. i � � .�� 1 i � , l� �.. y ���� 4 ° _ n i 1, x �o ' � ' , j�\ � f 1� �.� i ��� s - �� �� ,y � �� � �� � � ��.^ �-� . � o � . � ,�: , ��-�> >,� :, ,, � � �J: ����,.... �� ,, ,, � .av.._.Ff/� _��,� �!,�J b lJ. \ j�� `� �}`'Y- r"_'�� �J� l7 r\ � �„�.�/ �.-... �, �\ ;, � '4��� )l � � =..:%- ` � s.., 1 � I� �1 � � % v \ i /,` , ;'\ •'' � ..�\L ,I `� �� �.. ; '�1 � I r-� % r `�' .:. I�I \ 1 ��•,•�,'e {1 f '1.t!'—`t . �' ._ ! J p «�, ,,1 .�:,j.�.� �,... �. � � ; '�� ;, � r ;��� , � � �,. , � 1� I, �v 11 �tl � �} � ���! y � ` ,�/�� J I I �i � �1 0 ' f � l� " �'�� 7 �' �, �� J t � � i �1� 1� 1 1 , � .. �.l ! � \ � '� ' 3+ � Z� �1 I� L.. t�. f �� � Z � � .i ( t r�' � `'�.�__.� �Il I f � � �+ w Y�, �l� �� f i 1/ i � , 1 .,.,,�s� " 0 1� 1 ( �... �1 '' ' :F ;1 ti ,��� J ,� � �., ,..:� o �� � "1� ,h ��.--� � , �r-.1 , . / , ,t �.:� a� �,�, �� ��`�... 1� _ , a�,. � ,--� � � i.. � , � � . ,.o r I' � � ,t ��, �.' e �. ...I �. . ti '� � j �", 1' ��� � � ( �o .� � � � 1 -��" � , . i � ,�; �, ' � �� � � "'"� � � � � - � , � � t..:.. � ' , 1� i p ,a � �� � ! i �f� � ,� . I � �'� ��'� ,/ 1!/)) '�'^ /� I ' � Is i � , � ��1.� � !I/ li � � � � i j.':o �j / � �f J d ' � i � � � � . },I , � ; � �- � � ' � i ' � �' �� ij a ' " ` �7 � � �� ,-, �� ' �� � � : �� ` , ! � { '. >i 1 ! � i `, � � P w �� � � � ��� j e � ! � � i I r ��� `., _ r �.r� � � . !� � . p , r--j�+;, ' lt : ; u � t �`•` U(. '..,- _"'�- ' _ ;,1,,� 1, �t� � ' ; � � s i f � � , � ° !� .,�- `\ d � 'i . ' � !f1 � \ . � � - r✓�' � ,r/ i � / �'�' � � �� i � �'' � „'�+�"�, i ,•�^% 1, ,� ,,•' t �� �/'� ��. � � ' ... � , �z � , ;� �� �� ' , � 4 , '� f . ,-� � i �, i, �, 1! , ,,,,,.., � ' • l, i 1 � f � � a• J� y ! ! � 1� .` � , l I°� ,�� � �� a w . '' " � � l� 'I �" �i \\ , .-.,' !i � i, �! � � � a � ' f ; ... �� � � Z � �� g '� ' !! �i �""� ^ \ � a W j t' �;f, � � � � Q i � �� ---� ���, !� Q � `� , � � v ' � Y ,�--- - � �+ •_J � 1� �� � , i! w w -�, ,.,,�`,� `�, a��i.; � c. � � ,� 1 � � a�� � CL � � � � . i ,.�y° ,. v �_ � e7 �_>� 1 f�f .�(�. ' -�-1 �� 1� � � '°\ � �.� r� , ; � ,� � , f c �, � A � , '�.���Q �., ! `1 �} ^1�. '.� � i�r� V _ � t};, r r � :�C 4 � �I� � �ti �� n����!� 1 �z ��, a a.; ; �S '�' , ?T�'wa, wM� : �+ y,� _ . � il.l. �ti,,,, ..t .. �.�1�l�� [` � tt� ��, � /•Nr i :, � —�, . —rt- + � , ; . , ! � `',. , e -4�. _. ..,� ._ � . �.. ,,r.�t+v • i - a E I� a�,� ,,� {�,I u.� .y 3 I.�:' l� ,�`" ���'�'i. '� � �:� � �.. �� �, � '"��C.a�,w ,� .�� � � � ��� ' : " P � 1� - y ',�'r r rv ,��� 3 ��� -ti .} ; p� I�. I� ' � yw M'�'.sa ���� �� �, � �' f+� � �� ro.^� , ��,,�� � � . ti � - �'' ��' _ i '^' �' `�.--, �E E 7% �,.�'%� - � ,* 11 1 1 �' � � i , ' ��+ �� �a+.� w a �u� '� �%Y� ��'I � 0 � �. r4 r� �N i � ti s"�!•r,', Ja�i `� ; �� '� � � � � yo /• � p6 � ,y, � � - -- , � i� ,� � � . ,�` !! ' � � .,�o�"�,,.-+�. /�. f j ., ' � �'' � �.,.-,.�_ �.�'_ ' 'vo�s* �:�« �,� 1 _i� Z '� �1 � �..-�� '�\ ! —�y� o ,�•,�� ( �.\ .. � ' �'� --.�11�`�� � r s, � � ``� � ; � �"�---��,.� ��i � �� �' � � " •A I / �f �..\ S;: ` " ��� �—:'�- ' /� � ��� C. ... �',2J / '�- ' /L�--.—�.� \~�r`�`�'r.��,-,� � II�.''y� � � \-��.�� � '��5 ` ' � ti l �� � �J� _ ,�,..,. -. ,� .r `S�i--� "'� 'i"`. ,,,e ' �_� eo. � ��c,- '' " ��: -. . _-- - .---`�� - � .. . .�� - - - -_ -- -—� �- .- _ - _` � - � -- -`. .._.. _,_ ..._ ._._ _.._-'- y--� -- - - � I \\�'�� � -�_�. _ '� C t Y �`'� 'n"` f � rn...� C . �.� _' . ... . _'_ . _ . ' .. _ _ .. 1 .. . - '— �� •� •� � U"'�!= '� . �� � - _-�-� � � r ; T_ �__ . _�- � ,� �o� ,:r .�,�. - � ��K .ISH -= - — � �E� � �.- 4 -'"'� • .� . ` - • . _ _ ' - ti .�r'; -, �` - m»;... � �� ;r � _,._,-- -� - .r�..,. � __...� - - -- _ _S,� - ` U� .- � �� � tir� c.w� - ._ - -- ti w.r._ ' v n o i� �i v i[ 2 . . j _ / ;o` ` _,= i� � .r `r � -. _ ^ t-1'Ya _ - - _ `y ' - ~ � `�' �,.. ' � �1 �' �;`r'' ••c." � �, . - � � - - ,. . _ �\ '_ 1� '�� " � i� L '�'V� �� �'� :.�._:-C.i� _ ` � . '+y _ ' Y� i i n i w t v o'a� 5 r-" i� . r ti' _ �' �i_ ',J � \�l i " �'r _ z'{". _^� '�3' �� L�" r c:- � .� "�^F°^ •- - , s. ', idu�G_.. �� .""� - - -. . '_ MeOwa �Z� .• C.. � ' ypPylmM Rlw } __ " . � � ; . _ ' .- '-- _ `r ���i \L �\ V�� ' -,i � _ ` �\ _��t - ` �./'7�I�'-. _ S`r� _ L.. _ _ °., ` F � �^ ) t� -; ` "� �_ - _ . _'-a— ,_ --. _ �'. - _ - . _ O [.�e i,�.. _ �y. ! �='� � - � t-_ .. , � :� � � , . . : • ` - - - `f � �,. RlVER .- ;� '� - '' �. � - .r ' � t y S t_'�_� \ L^�'`' ' - - - • �'p-'.. .-- - . ,�....- -- ' ..j�:4. _ — . � �� -T- � 1 � ' - �1 ,__ . - . _ _-, . - -� - - '-.� � � R�,.... - . •:l t � —t M it i _ f� � `_�• ' _ _ -v _ PU�ET � - ,,,�..0 ,.��.. _, _ _._ . _ _ _o , ��� ( •Y__� - Gw.l 1 _ :-� pw �� �, _ . . : `�' _ � ., _ � _-_ _ ,;.�;�aSIN _ . ; '" �. _ , _ . c� ; ; ,� -- _. _:�> . . '! I -� -� `� r.i' . _' ��:. . �.,..2 _' �. �"r n�-� _ y� . . M{0OA FoA ' _ - . . � \ `� � '�. . � ' �� .. .- `f ^ � _ ' .'I� ^,��� '� #...`.0 • �� -` ..._,_ �..� ' tti.._ �c. - _ • '�' !A`fj�q A"°+ ti'�.. . `J _ ' .- .. � ' - � .L Y 9wb .. • _. -- � . i .. 1 �'•pvmwu.+ .�� . �. -�� `-' � __ _ _ . _. � �-fi?���� _ _ . -:_ �--- __ � '; -- - r,: t' - ~ -r_ _ �/ � ` � %' �� J �` �� � ,�: � � _ • , w„r -, �� `;�,� i, ��-"7'"� W, .� - rJ -..�� + �`'� '� �. :-��� 5-'L�. t .r_� ' ' ` �L... — . •�'_� i � ``-- �a.+. ��, i . � - . —�._ � -._ .�w..,.r l — `G ;: _ , . J � `�� _ ���� � - �i ' ._ ' _ o..wn - � ` 'r ` ,.' � �-. sa�n wa -- - .\� . --.�� � - � ,l: ,_ � ,,.�' ,_��:" ` r . ._'j Figure 2 � . � �.�.. \� �- `� " �'' � _ _ ,� � '" J�--��� ` ' t� �� `'\ � � 1' � , . _ -• ._ � i'•'�� _ - �.. _ � , �rc...a �' � a`-=� � _ = 4 �� DRAI NAGE BASI NS� - . . � : + �.y'- �� .' _ -��'�:- 4� - . 2 se�u.iv.� � . �-� Io.�s �� '-�j; - t v {' ]:_ / � .%MI .'..�'�� ,�,,. '�. �� � I . . � ; � ,.. :... _ - � y ^. � �` ` ` ,\ Ki�nty ',- __�DRAINAG " _ � � �- � a„«.E.n� ,��,�o y. ^ ..� � _�` _ , " � 3 . i� � � 11 - �• � � �� � ' ` - _ ! '- i �� t�Y _ =, 1` � ti i � ii -� ; '— ,��� _`. . �� \\�- ,' ..� � � ti r,.� _ , - ,�_� �l� / /~,• \�� ! `� ' � ; -�3� �- �' �Q ��;�--_ ��, �� Major Basin Boundary � TACOIIII '• � ��l \ � � / �` � �'- �.� ._ ,.,u.�n � r;_/� ,. � �<, -�_.% ` 'l \\ \ ,� _ � :.:7 _' - / ` ) �� � � 'c.� ( ��� \� �� „� ` _ `.\ j �`-°�-'� � ,... �_� a,;,n t f �-� 'Yt-'1 _�' �� t `� -R: --- - _ ------ 1--� :�., _� � � S�b-Basin Boundary t-� �� �, �, 3 � „�.... - 'M _� /�. < _ — �� i. � � _ � { ; ��yti., � ✓ �• -�` ,i",' Soures: King County Sensitive Aress �•.. � ,-.-� ,::.:,_ �-.:,. ,' � � Msp Fota,Wetl�nds Supplement i. � .�_- ,�' _`•.�., � ::�--- / �- . s 'M�. � ( ..�. 3 L ��''�". :'ti_ ,/ RiTqI�MK►�)T[pNEo �-- /'S-� J�. �� !` ) � . ✓�'�1�'� � t "� F- � / ' YYI��� . �.\ `:\ . _ ._ `. � J M�M Rr � � ~ - � � �� ', - , �. -� � � � J-,.� BAS '.. � . °"".' �"��.'� '_ ��' �.,/ti� -��-_ .�\ ! � �j ' .� ; �,�, • _ , ��. \ _ - , - _ �y �'` /. .��....-_ \' y � . . �� � _ .1y4``�` y{ \ ♦` `._-��"• - � . _� '� _ O I 2 3 4 5 6 7 B Miles � �� rf , / 1:300,000 � U� h � � w a � � N 0 � � � � VIII. OTHER PERMITS At this time,the pernuis anUcipated for this project are as follows: • Roadway and Drainage Construction • Grading Permit 7976.003[DEDlmu�/kn] IX. EROSI�N/SEDIMENTATION CONTROL DESIGN IX. EROSION/SEDIMENTATION CONTROL DESIGN The limits of clearing have been shown on the construction plans to encompass the entire site area. Silt fences have been shown on the plans to protect the adjacent properties from any possible sediment runoff. Since the site is only approximately 2 acres in size,and currently infiltrates all on-site stormwater, we do not feel that it is necessary to provide any form of sediment traps or ponds. As conswction progresses,silt fences will be maintained,and catch basin protection will be installed to ensure that all stormwater leaving the site is clean and free of sediment. Once the underground detention vault is installed,it will act as a sediment trap,which will ensure that not sediment laden water will leave the site. 7976.003[DED/mrc►/kn] �/1 �"� � � � Q � � � 0 ►-� E"'� � A A � �C X. ADDITIONAL DOCUNIENTS A. RETENTION/DETENTION FACILITY SUMMARY SHEETS AND SKETCHES 7976.003[DED/mmlkn] KI �IG COUvTY, WASHINGTON, SURFACE WATER DESIGN MANUAL RETENTION/DETENTiON SUMMARY SHEET Development �U�4� �av� �t.f�Tl2i�tL �PP(�£nsT1C�..Sff7P Date �I t5 � p ) P�N 'f���b Pt20b Location S•W� 1� '�'� ���� •��- • ENGINEER DEVELOPER Name �"�"� �+(�'i3� Name �I�-1— ��'`�s�(L- Firtn 13�61'f�VS4,�1 Frm �U�/� fDUNt�£.t�G'f(LiG/tt, A�F�4-n'sT7C£Sf1P Address c�Z15 �2� I�,r� S Address S�Uo b�/rV�5. 5�1� Zo� ��NT �-�A `1�03 2 S��c. u-�R� 5$l o�S Phone �5 - �1 -622Z— Phone �b-��03-'?"1S� • Developed Site Z• Z acres Numberoi Lots � • Number oi Deiention Facilities On Site � • Detention provided in regional facility 0 Regional Facility bcation • No detention required � Acceptable receiving waters • Downstream Drainage Basins fmmediate Majar Basin BasinA (���1 ��(�_ Basin B - Basin C Basin D TOTAL 1NDIVIDUAL BASIN Drainage Basin(s) � A B C D Onsite Area 2,21 2.21 _ � Offsite Area v���. V�� - . Type of Storage Facility LiveStorageVolume �v ���D b��� � Predeveloped Runoff Rate 2 year ���� � 10 year o.St�1 � Postdeveloped Runofi Rate 100-year b•5�g � 2year °.q$�' I �oyear (•5i9 : Developed Q 100 year 2•�I�}- = Type of Restriclion oR�r��- Size of OrificelRestriction Orifice/Restriction No_1 2 ��g11 --- - .-. No.2 3� 8, No.3 No.4 i No.S XI. MAINTENANCE AND OPERATIONS MANUAL FC I N G C o U � �r Y, �v r� S F i t t�1 G 'T O �, S U IZ 1-� A C [. �V n T E R O E S I G N h1 A V U A l. MAINTENANCE REQUlREMENTS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES NO. 1 - PONDS j Maintenance Condltions SNhen Maintenence Results Expected Component Defect is Needed When Malntenance Is Performed Generat Trash 8 Debris My tras� and debris which axceed 1 Trash and debris cleared trom site. c�bic toot per 1000 square (eet (this is about equal 10 the amount o(irash it would take to lill up one standard size oHice garbage can). In general,there � should be no visual evidence of dumping. Poisonous My poisonous vegetation which may No danger ot poisonous vegetation where Vegetalion constilvte a hazard to County personnel County personnel o�the public m19ht or tha public. Examples of poiso�ous normally be. (Coordinalion with vegetaGon include: tansy ragwort,poison Seattle/IGng County HeaNh Department) oak,sGnging nettles,devils club. Pollution Oil,gasoline,or other contaminants ot No contaminanis presa�t other than a ona gallon or more or any amount(ound suriace film. (Coordination with thal could: 1)cause damage to plant, $eattle/iG�g County Health Oepartme�t) animal,or marine life;2)constitute a lire haxerd;or 3)be flushed downskeam during rain storms. Unmowed Grass/ M taaGty is located in private reside�tial Whe�mowing Is needed,grass�gro�nd Ground Cover a�ea,mawing is naeded when grass covet should be mowed to 2 inches in - exceeds 18 inches in height. In other height. areas,the generat policy is to make the pond site match adjacent grou�d cover .� and terrain as bng as there is no interierence with the tunction o!the laciliry. Rodent Holes My evidence of rodent holes if faciliy is Rodents destroyed and dam or berm acting as a dam or berm,or eny evidence repaired. (Coordination with Seattle/ ot water piping through dam or berm via iGng Cou�y Nealth Department� rodant holes. . Insects When insects such as wasps and hornets Insects destroyed or removed from site. interiere with mai�tenance activities. 7ree Growth Trea growth does not allow maintenance Trees do not hinder maintenance aooeu or inteAeres with maintenance activiNes. Selectively cultivate trees such activity(_a,slope mowing,s�7t removal, as alders for firewbod. vactoring w equipment movements). H trees are not inteAering with aocess,leave t�ees alone. Side Slopes of Erosion Erodad damage over 2 inches deep Slopes should be stabilized by using Pond where cause ol damage;s still present or appropriate erosion co�trol measure(s): where there is potential tor cantinued e.g.,�ock reinforcement, planting of erosion. grass,compacGon. Storage Area Sediment A�ccumulated sediment that exceeds 10% Sediment Geaned out to designed pond ot the designed pond depth. shape and depth; pond reseeded i} necessary to co�trol erosion. e'�^.i flikcs c..•e�o..,...... r.. .. . � ., -. . . . . - Y P:r' � , . _ .._ _ ... ,;.o �.wwu ud uwlt uack to ti�a oe5�yn inches lower than the design elevation. elevalion. Emergency Rock Missing Only one layer ol rock exists above native Replace rocks to design standards. Overllow�Spillway soil in area five square feet or larger,or any exposure ol native soi1. :�-1 �(ll: K ! N G � O l� 1 l l', \� �� S i I I N G "I O N, S U i2 1� n �: E W n 1� i= li t) 1=. S 1 c� � nt �', i�1 U �\ L. NO. 2 - INFILTRATION Melntenance Co�dlUons When Malnte�ance Results Expected Component Delect I• Needed Whe� Malnlenance la Perlormed General Trash 8 Debris See 'Ponds'Slandard No 1 See'Ponds Stendard No. t Poiso�ous See 'Ponds Standard No. 1 See "Po�ds Siandard No. 1 Vegetation Pollution See"Ponds"Standard No. 1 See 'Ponds Standard No. t Unmowed Grass/ See 'Ponds'Standard No. 1 See 'Ponds Standard No. i Ground Cover Rodant Fbles See "Ponds'Standard No. 1 See 'Ponds Standard No_ 1 insects See'Ponds'Standard No. 1 See"Ponds Standard No_ 1 Storage Area Sediment A percolation test pi!or test of facility Sediment is removed and/or lacility is indicates facitity is only wor{cing at 90%ot cleaned so thnt i�(iltrat'ron system works its designed capabifities. according to design. :I�eet Cover Sheet cover Is visible and has more than Sheet oover�epaired or replaced_ {H Applicable) three t/4-+nch hotes in it. Sump Flled With My sediment and debris tilGng vault to Gean ou1 sump to design depth- Sediment and 10%of depth Irom sump bottom to Oebris (lf bottom o(ouUet pipe or obstructing flow ApplicaWe) into the connecto�pipe. Filte� Bags Filled with Sediment and debris till bag mora than Replaca titter bag or redesign system_ Sediment and 1/2(ull. Oebris � Rock Flters Sediment and By visua!inspection IitUe or no wate� Replace gravel in rock tilte�. Debris flows throu9h filter during heavy rain storms. —� -- A-� 1 f9(1 K I NG COUNZ' 1', WASH [ NGl� (� N, S U K f= ACE W .4 "I_ ER UESI GN M A N l� � L NO. 3 - CLOSED DETENTION SYSTEMS (PIPES/TANKS) Mnlntenence Condltlons When Malntenance Resulta Expacted Component Defect ls Needed VYhen Malntenance Is Performed ' Storage Area Plugged Air Vems One-haH of the cross section ol a vent is Vems tree ot debris and sediment. II' blocked at any point with debris and sediment. Debris and A�ccumulated sediment deplh exceeds All sediment and debris removed lrom Sediment 10%01 ihe diameter of the storage area storege area. for 1/2 length of storage vault or any point depth exceeds 15% 01 diameter. Example: 72-inch storage lank would require c�eaning when sediment reaches depth of 7 inches tor mora than 1/2 length of tank. Joints Between My crack allowing material to be All joints between tank/pipe sections are Tank/Pipe Section lransported into facility. sealed. Tank/Pipe Bent My part of tank/pipe is bent out ol shape Ta�k/pipe repaited or replaced to design. Out ol Shape mote than 10%o(its design shape. Manhole Cover not in Place Cover is missing or only partially in place. Ma�hote is dosed. My ope�manhole requires maintenance. Locking Mechanism cannot ba opened by one Mechanism opens with proper tools. Mechanism Not maintenance perso�with proper tools. V�lorking Bolts into lrame have less than 1/2 inch of thread (may not apply to self-locking lids). Cover Ditficult to Ona maintenance person cannot remove Cover can be removed and reinstalled by Remova lid after applying 80 pounds of liri. Intent one maintenance person. is to keep oover lrom sealing ofl acoess - to maintenance_ Ladder Rungs FGng County Safety OHioe and/or Ladder meets design standards and Unsafe meintenanoe petson j�dges that ladder is atlows maintenance pe�sons sate access_ unsafa due to missing rungs, misalignmant,rust,w cracics. Catch Basins See"Catch Basins' Standard No. 5 See 'Catch Basins' Standard No. 5 A � l�rv hING COU NTl', �V ,� SHINGTON, SURf ACF WA "CER [� EJIC; N �4ANU � 1. NO_ 4 - CONTROL STRUCTURE/FLOW RESTRICTOR Metntena�ce Conditlons When Malntenance Resulta Expetted Component Defect (s Needed When Mafntenance la Perlormed Gene�al Trash and Debris Distance betwaen debris build-up and Ali trash and debris removed_ (Includes botlom ol_orifice plate is less than 1-t/2 Sediment) feeL Structural Damage Structure is nol securely attached to St�ucture securely attached to wall and manhole wall and outlet pipe strudure outlet pipe. shouid support et least 1.000 pounds of up or down pressure. Siructure is not in upright position (allow St�ucwre in corre�t position. up to i0%trom plumb). Connections to outlet pipe are not Connections to outlef pipe are watertight; wateAight and show signs ot rust. str�cture repaired or replaced and works as designed. - My holes—other than designed holes— Structure has no holes other than in the structurs. designed holes. Cleanout Gate Damaged or Geanout gate is not watertight ot is Gate is watertight and worics as designed. � Missing missing. Gate cannot be moved up and down by Gate moves up and down easily and is one maintenance person. watertight. Chain leading to gate is missing or Chain is in ptace and works as designed. damaged. Gnte Is rusted over 50%of its wrfaoo Gate is repaired or replaced to meet area. design standards. , �^fifice Plate Damaged or Control devioe is not working Propedy Plate is{n plaoe and works as desi9ned. Missl�g due to miuing,out ot place,or bent orifice plata _ ObaVuciions My Vesh,debris,sediment,or vegetation P{ate is free ot al!obstructions and worlcs blocking the plate. as designad. Ovefiow Pipe pbsuuctions My Vash or dabris btocking (or having Pipe is tree of all obstnlctions and woAcs the potential ot blocking)the overllow as designed. - pipe. Manhole $ee'Closed Oetention Systems'Stsndard See"qosed Oetention Systems'Standard No_3. No.3_ Catch Basin See'Catch Basins'Standard No.5. See'Catch Basi�s'Standard No.S. ^_4 1!9(1 Kl NG CUUN "l� l`, �\' AS }i1NG "1 C) N. SURFACE ��� :� "I F_ 12 (> I: SIGN M �'� NUAL NO. 5 - CATCH BASINS Metntenance Condltlons Whe� Malntenence Re�ultc Expected Component Delect Is Needed When Mnlnlenance In Per(ormod General T�ash & �ebris Trash or debris ol more than i/2 cub�c No trash or debris located immediately in (Includes toot which is focaled immediately in tronl lronl ol catch basin ope�ing. Sediment) ot the catch basin opening or is blocking capacity of basin by more than 10%. Trash or debris (n the.basin) lhat No trash or debris in the catch basin. exceeds t/3 the depth Irom the bottom of bas�n to invert of the lowest piFe �- or out of the basin. Trash or debris in any in�et or ouUet pipe Inlet and outlet pipes Iree of irash or blocking more Ihan 1/3 of its height. debris. Dead animals or vegetation that could No dead animals or vegelation present generate odors that wo�ld cause within the catch basin_ complaints or dangerous gases (e.g., methane). Oeposits ol garbage exceading 1 cubic No condition present which would attract (ool in volume. or suppoR the breeding ot insects or rodents. Structural Damage Corner of frame extends more than 3/4 Frame is even with curb. to Frame and/or i�ch past curb face into the street (f Top Slab appficable). Top slab has holes la�ger than 2 square Top slab is iree of hotes and craCks. inches w ciecks wide�than 1/4 inch (ntent is to make sure atl material is running into the basin). Frame not sitting flush on top slab,i.e_, Frame is sitting tlush on top stab. separation of mora than 3/4 inch of the frame from the top stab. Cracks in Basin Gacks wider than //2 inch and Ionger Basin replaced or repaired to design Walls/Bonom than 3 feet,any evidence of soil particles standards. entering wlch basin through cracks,or maintenance person judges ihat structure is unsound. Gacks wider Ihan 1�2 inch and longer No cracks more than 1/4 inch wida at the � than t foot at the joint ot any inlet/outlet joint of inlet/outlet pipe. pipe or any evidence of soi!partides entering catch basin lhrough cracks. Settlement/ Basin has settled more than 1 inch or has 8asin replaced w repai�ed to design Misalignment rotated mwa tha�2 inches out ol standards. ' alignment. F�re Hazard Presance of chemicals such as�atural No tlammab�e chemicals present. gas,oil,and gasoline. Vegetation Vegetation growi�g across and blocking No ve9etation blocking opening to basin. more tha� 10%ol the basin openi�q. Veqetation growi�g i�inlet/outlet pipe No vegetation or root growth present. joints Ihat is more Ihan six inches talt and loss �nan a�� ,ucnes apan. Potlutlon Nonitammable chemicals of mo�e than No pollutio�present other Ihan surlace 1/2 cubic foot per Ihree feet of basin (ilm length. �-S tNU i� ING C (� UN "1� �', �v � 5 }jING "TON, SUR }=' nCF� W �t "I EtZ DESIG N MANUAL ' NO. 5 - CATCH BASINS (Coniinued) I' Melnlenanco CondtHona When Melntannnce Resulta 6cpected Component Do(oct la N�sd�d Whe� Mnintennnce Is Performed Catch Basin Cover C;over Not in Place Covsr is missing or only penially in place. Catch basin cover is dosed. My open catch basin requires maintana�ce. Locking Mechanism cannot be opened by one Mechanism ope�s with proper tools. Mechanism Not meintenance person with proper tools. Worki�g Bolts into(rame have less than tJ2 inch ot thread. C,over Oitt�cult 'o One maintenance person cannot remove Co�er can be removed by one Remove lid after applying 80 Ibs_of lift;intent is meintenance person_ keep cover from sealing oN access to m aiMe n a�ce. tadder Ladder Rungs Ladder is unsate due to missing rungs, Ladder meets design standards and Unsafe misa(ignment,rust,cracks,o�sharp allows maintenance person safe access. edges. - Meta!Grates Grate with opening wider than 7/8 inch_ Grate openings meet design standards. (f appticable} Trash and Debris Trash and debris that is btocking more Grate tree of trash and debris. than 20%of grate surface_ Damaged or Grate missi�g or broken member{s)o( Grate is in place and meets design Missing the grate. standards. �_ ' , � i�n KING COl1i� 1' 1', �VASHINGTON, SURFACF W :�, TFR i) ESIGN M � NUAL NO. 6 - DEERIS BARRIERS (e.g. Trash Racks) Malntenance CondWons When Mnlntenence Resutta Expocted Component Defect Is Noeded When Malntenence la Performad General Trash end Deb�is Trash or debris that is plugging more Barrier clear to receive capacity tlow_ ihan 20% of the openings in the barrier. Meta� Oameged/Missing Bars are bent out of shepe more then 3 Bars In place with no bends more than Bars inches. 3/4 inch. Bars are missing ot entire barrier is Bars in plsoe eccordi�g to design. missirg. Bars are loose and rust is causing 50% Repalr-or reptace barrier to design deterioration to any part of barrier. standards. A-7 i�i� K1NG COI.� NTI', �VnSHINGTON, SURFACE W .� 1 1: 1z DESIGN t�QANUnI. NO. 7 - ENERGY DISSfPATORS Melntene�ce CondlUons 4Vhen Malntenance ReauFts Expected Component Defoct la Needed When Malntenance la Performed Extemal= Rock Pad Missing or Moved Only one layer of rock exists ebove native F�eplace rocks to design standard. f�ock soil in nrea tive square feet or lerger,or any exposure ot native soil. D�spersion Trench Pipe Plugged with Aocumulated sediment that exceads 20% Pipe cleaned/ilushed so that it matches Sediment ot Ihe design depth. design. Not Discharging Visual evidence ol water diuharging et Trench must be redesig�ed or rebuitt lo Water Properly concentraled points along trench (normal standard. � condition is a'sheet ilow'ol water along trench). Intertt is to prevent erosion damage. Pertorations paer t/2 of perfotations in pipe are Clean or replace perto�ated pipe. Plugged plugged with debris and sedimenl. Walar P.,ws Out Maintenance person observes wate� Faciliy must ba rebuilt or redesigned to Top or'Oistributor' Oowing out duting any storm less than standards. Catch Basin the design slorm or it is causing or appenrs likely to cause damage. Receiving Area Water in receiving area is causing or has No danger ot landslides. Qver-Saturatad potential ot causing landslide problems. I�ternal: Manhole/Chambe� Wor{�or Damaged Structure dissipnting ilow deteriorates to Replaca suucture lo design standards. Posts, 8aftles, t/2 or original size or any concentrated Sides of Chamber wom spot exceeding one square foot which wou{d maka structure unsound. Other Defects See 'Catch 8asins' Standard No.5 See'Catch Basins' Standard No.5 n o 1/'9(1 }: I NG COUNl l', WAtiII ] I�tGT (> N, tURF= �� CE; ��' ,-� TER DESIGN MANUAI. NO_ 8 - FENCING Melntena�ce Condltlons When Malntenance Reiults E�cpected Component Dofocl la Needed YVhen Malnte�ance la Performed Goneral Missing or Brokan My defect in tha fence that permits easy Parts in place to provide adequate Pans entry to a taciliry. securiry. li t Pnrts broken or missing. 6roken o�missing parts ropinced. I Frosion Erosion moro ihan 4 inches high and t2- No opening under the fence that exceeds 18 inches wide permitting an opening 4 i�ches in height. I under e fence_ I Wire Fences Oamaged Parts Posts out ot plumb more than 6 enches. Posts plumb to within 1-1/2 inchas. i Top rails be�t more than 6 i�ches. Top rail (ree ol be�ds greater than t inch. � My part ot tence (nduding posts,top Fence is aligned and meets design ' rails,and tabric)more than 1 toot out of standards. design e(ig�ment_ Missing or loosa tension wire. Tension wire in place and holding fab�ic. Missing or loose barbed wire that is Barbed wire in place with less than 3/4- sagging more than 2-1/2 inches between inch sag between posts. posts. Extension arm missing, broken,or bent Extension arm in place with no bends out of shape more than t-t/2 inches. Iarger than 3/4 inch. Qeteriorated Paint PaR or parts that have a rusting or scating Sttucturatly adequate posts or pdtts with or Protective condition that has aHected structural _ a uni(orm protective ooating. Coating adequacy. Openings in Fabric Opanings in tabric are such fhat an& No openings in fabric. inch�iameter ball could fit through. �;-i i,'.., KING COU NTl'. WnSNING "f (� N, SURFACE �VATL= R DGJIGN ,�1 �� N UAL NO. 9 - GATES Melntena�ce Co�dlUons VJhen Malntenance Heaults Expected Component Defect la Nesdsd When Malntenance Is Perlormed Generai Damaped o� Missinp gate or locking devices. Gates antl locking devicas in place. Missing Membars - &okan or missing hinges such that gate Hinges inlact end lubed_ Gate is working cannot be easily opened and closed by a Ireely. maintenance person. . Gate is out of plumb more than 6 inches Gate is aligned and vertical. and mo�e than 1 toot out ol design alignment. Missing stretcher bar,stretcher bands, Stretcher ba�,bands, and ties in place_ nnd ties. Openings In Fabric See 'Fencing' Standard No.8 See 'Fencing'Standard No.8 KI NG CUU � TY, �l' ASHINGTON, SURFACF WA �� ER DESIGN MANUAL NO. 10 - CONVEYANCE SYSTEMS (Pipes & Ditches) Malntenence CondlUons When Meinlenance Resulta Expected Component Defect la Needed When Melntenance Is Porformed Pipes Sediment 8 Oebris Accumulated sedimenl that exceeds 2096 Pipe cleaned of all sedimenl and debris. of the diameter of the pipe. Vegetation Vegetetio�that reduces free movement of All vegeta�ion removed so watar tlows water through pipes. freely through pipes. Oamaged Protedive coeting is damaged; rus!is Pipe repaired or replaced. causing more than 5096 deterioration to any part ol pipe. , My dent that decreases the cross section Pipe repaired or replaced. area of pipe by more than 20%. Open Oitches 7rash � Debris Trash and debris exceeds 1 cubic toot Trash and debris cleared i�om ditches. per.1,000 square leet of ditch and slopes. Sediment Aocumulated sediment that exceeds 20% Oitch cleaned/tlushed of all sed'unent and o}the design depth. debris so that it matches design. Vegetation Vegetation thnt reduces free movemenl of Wa1e�flows treety through ditches. water thro�gh ditches. Eroslon �amage to See'Ponds' Standard No. 1 See 'Ponds'Standard No. 1 �Slopes Rock lining Out ol Mai�te�anoe perso�can see native soil Replace rocks to design standard. P�ace or Missing (H benea4h the rock tining. Applicabte) . Catch Basins See'Catch Basins'Standard No.5 See'Catch Basins'Standard No.S Debris Barriers See'Oebris Batriers' Standard No.6 See 'Debris Barriers' Standard No. 6 (e.g.,Trash Rack) A-11 l� KING COUNTY, WASHINGTON, SURFACE WATLR DESIGN MANUAL NO. 11 - GROUNDS (Landscaping) Mal�tene�ce Condldona When Mal�tanence Resutts Expected Componant Defect la Needed When Malntena�ce Ia Performed Genorai Weeds Weeds growing in more than 2096 of the Weeds presenl in less than 596 of Ihe (Nonpoisonous) landscaped area (trees and shrubs only�. landscaped area. Safety Hazard Any presence of poison ivy or other No poisonous vegetation present i�a poisonous vegetation. landscaped area. , Trash or L�ttar Paper,can,bottles,totalling mora than i Area cleer ol litter. cubic foot within a Iandscan�A area (trees and s�rubs only)ot 1,000 square 1eet. Trees and Shrubs Damage Limbs or pnris o(treea or shrubs that are 7rees nnd shrubs with less than 5%ot tha split or broken which afiect more than total loliage with split or broke�limbs. 25%of Ihe total foliage of ihe tree or shrub. Trees ot shrubs that heve been blown Tree o�ahrub in place free o(lnJury. down o�knocked over. 7rees or shnrbs which are not adequately 7ree or shrub in ptace and adequatety supported or are leaning over,causing suppo�ted; remove any dead or diseased exposuro oi the roots. trees. �.-1L i,':.. K1 NG COUNTY, WASHINGTON, SURFAC; E WATER DESIGN MANUAL NO. 12 - ACCESS ROADS/EASEMENTS Malntenance Condltlo�s YVhen Malntenence Recultc Expected Component Detect Is Needed When Malnte�ance Is Perlormed General Trash and �ebris Trash and debris axceeds 1 cubic foot Trash and debris cleared Irom site. per 1,000 square feet,i.e_,trash and debris would litl up one standard size garbage can. Blocked Roadway Debris which could damage vehicle tires Roadway iree o(debris which could (glass or metal). damaga tires. My obstruclions which red�ce clearance Roadway overhead clear to 14 feet high. above road surtace to less than 14 feet_ ` My obstructions resUicting the access to Obstruction removed to ellow at least a a tQ to 12-l001 width for a d(stance of 12-toot access. more than 12 feet or any point restricting access to less than a 10-foot width_ - Road Su�face Settlement, When a�y su�face de(ect exceeds 6 Road surfece uniformly smooth with no Potholec,M�sh inches in depth and 6 square teet in a�ea. evidence of settlement,potholes,mush Spots,Ruls in general, any surtace defect which spots,or nrts. hinders or prevents maintenance access. Vegetation in Road Weeds growing in the road surface that Road surface tree of weeds taUet than 2 Surfece are more than 6 inches tall and tess ihan inches. 6 inches apart withi�a 40asquare-toot area. Sho�lders and Erosion Damage Erosion within 1-foot oi the roadway more Shoulder fcee oi erosion and matching Ditches than 8 inches wide and 6 i�ches deep. the surrounding road. Weeds and Brush Waeds and brush ezoeed 18 inches tn Weeds and brush cut to 2 inches in height or hinder maintenance socess, height or cleared in such a wny ns to ' allow maintenance access. � A-13 ��