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HomeMy WebLinkAbout03113 - Technical Information Report �/ � m TECHNICAL INFORMATION REPORT CHATEAU AT VALLEY CENTER Davis Ave . S and S 45th St . �� Si�E ��VELCr��E�i'?' S��c`J'�C�� 310 208TH ST S�' �OT?:ELL 9�Oy2 �, �i�.:� ,� '��_—�!6�� �.�;ri�, i8, 2C�� �/ZS o3 G TDG+',�r,3 .,, � ,�,��gf '��. <<•"�! `�.� •j j Q�lti� �t �� ��O � � „ �s t� 5� � 'b� y � aa •�, 9�x � �,►��r�`� s-, _._ _ ,_ � .. ;� C� C� � u ��� �� �l i Ex.za�s O :�� ,� I i i ;'; APR 2 9 2003 ;� �; �� i ;�� � �� � � � 3��3 TABI,E OF CONTENTS SECT T viv i�C. Project Overview I rreli:ninary Ccndi�icns S�ummary II ,not �equiredj Of�-Site Anaivs�s I�I Detention Design I`J (Includes Wetvault ) conveyance Systems Analysis and Des�gn ". i ��"`„ ���.: �i Special Reports anc Studies �II (not use::; i Basin and �ommunity Plann�ng Areas VIZ (nor used) Other Per*nits VIII (not Used) Erosion/Sedimentat�on Control Desi�r: IX Bond Quantities and Other Forms X Maintenance and Cperatior.s Manual XI ..t..at.d � .:, m ..e a? ..... PROJECT OVERVIEW PROJECT OVERVIEW ' Loca�.ed on the ncrtheast �orner �� Davis Ave . S and S 45�r I; St. , the site �s about 2 .77 acres in size and is covered �� with trees and brush. T�e roadway frontages have all beer. imprcved with cu�b, gutter, sidewalk, landscaping and street lighting. The enti�e site drains �o the north side, where a 12 inch stor•n drain collects all of tr.e runoff. See the Offsite Analysis Secticn for a cetailed descripzion of upst�eam, or.-s��e, snd downstream cor.ditions . mhe entire site is being developed as an assisted living iacility. Sur�ace parking is provided between the buildir.a ; and the streets . � future �arking garage �s shown on �he plans and is included in �ne calculations for detent�.on and ' water quality �acilities . The ga�age will be accessed o�f �I of Davis Ave. The main building entry �s off of Davis , Ave. , and a secondary access is located off of 45 St. '� �torm water detention and �reatment is being provided through the use �f a wet vauit constructed on the west side of the site. Because a �imited off-site a�ea to �he east , is collected in the vault, an equivalent area next to Davis Ave. and on }he north tip of the site is being bypassed. The landscaped area next to Davis Ave. that must be deta�ned is co�lected in a French drair. and directed to �he vault . i � � King County Department of Development and.Environmental Services TECHNICAL INFORMATION REPORT (T1R) WORKSHEET Part i PROJECT OWNER AND Part 2 PROJECT LOCATION AND PROJECT ENGINE�R DESCRIPTfON Project Owner Praject me ( C�«���s ��v� /-��s��. . LL G C:l, ,� ,�� :,� ��(�-�� C.��.t�ev- , Address ��� ��x 4 O� Location v`/���d�'��,�� !Q_ cc!r� ����z --+ Township Z � Phone Range .S �zs- 4-z�,� -z�D o � Project Engineer I •�•L�z••Section 3 i I,�,l. �i i`c.� L. 7 n�!i h P rT�/ / Com p a n y S:'}p c7�.��lco��ou� � ^v���e 'Jj0 'ZC S $C Address/Phone � Part 3 TYPE OF PERMIT Part 4 OTHER REVIEIINS AND PERMITS APPLICATION Subdivison DFW HPA Shoreline Management � i Short Subdivision COE 404 Rockery �rading DOE Dam Safety Structural Vaults Commercial FEMA Floodplain Other Other COE Wetfands � ��`"�``�"� �c`(�S Part 5 S1TE COMMUNITY AND DRAfNAGE BASIN � Community ' I Drainage Basin i3(a�(L rZ,'�«v- sv� -�� sr r� ��-,.e l,:v�ev�n I'Z:`��- f�3c� st`�-� Part 6 S(TE CHARACTERISTICS I River Floodplain Wetlands Stream Seeps/Springs � Critical Stream Reach High Groundwater Table ,�--� DepressionsLSwales Groundwater Recharge Lake , Other i Steep Slopes , Part 7 SOILS Soii Type Slopes Erosion Potential Erosive Veicoties f?��ia•.-w�'c� .J ��/i�t i.� J/�'IG��Prc2�� �FJ�-�.i� Additional Sheets Attached � Part 8 DEVELOPMENT LIMITATIONS i REFERENCE UMITATIOWSITE CONSTRAINT I Ch. 4—Downstream Analvsis n�a��� � . I Additional Sheets Attached II Part 9 ESC REQl31REMENTS , MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURINC CONSTRUCTfON AFTER CONSTRUCTIaN � l�Sedimentation Facilities �tabifize Exposed Surface VStabilized Construction Entrance �emove and Restore Temporary ESC Facilities ; r�Perimeter Runoff Control �Clean and Remove All Silt and Debris �earing and Graing Restrictions �Ensure Operation of Permanent Facilities ✓Cover Practices Flag Limits of SAO and open space 1 preservation areas �nstruction Sequence Other Other i Part 10 SURFACE WATE?� SYSTEIIA Grass Lined Tank Infiltration Method of Analysis �C nnei � � �S'�v � !/Vault Depression r/Pipe System CompensatioNMitigati Energy Dissapator Flow Dispersal on of Eliminated Site Open Channel Wetland Waiver Storage Dry Pond Stream Regionaf • Wet Pond Detention Brief Description of System Operation lA;'��� c-c��.r�v�n c � � ��-E-e,��-�ct�l _j.sJ z T '�[ci[1 1 � L7 5 c�.u v�:� �f—c S+o�^w. ��:.�ti vt t'Lt ��a�(c`5 �✓8- Facility Related Site Limitations Reference Faciiity Limitation �Part 11 STRUCTURAL ANALYSiS Part 12 EASEMENTSIfRACTS I �ast in Place Vautt Drainage Easement �ietaining Wall Access Easement Rockery>4' High Native Growth Protection Easement Structural on Steep Slope Tract Other I Other Part 13 S(GNATURE OF PROFESSIONAL ENGINEER I or a civil engineer under my supervision my supervision have visited the site. Actual site � conditions as observed were incorporated into this worksheet and the attachments. To the best of my knowiedge the information provided here is accurate. � � �z o O� Si ned/Date i�N � . N 41:;T Si � 177f� ST ' i S 11dt1��1 ,� _ _ ____ _ __ __ ___ _ '�__ ._. .... UALLEY � `� MEC'I(al rn C�NTER . �'' � .� m � x„ W .43RD_, ST _ � S 4" T � �, � �� `� ���� SITE P�'� :. •�=,rii �� & "' RIIE � 0 m 1541i1 SF � VI�INITY MAP �, /y.r^[ � . + �L,e. .,` �f �-�:�� qli r- � , .:.I'. !� A�rv..{ !' `� �:I�Z` ' � ' � '� '•.�a� � � � •� '° �, ,/� � �/�jy 1 / , �1 . ! )1.�..H>' w18� �.._��//'. ��� ��'i 1 4 �,f. � iJ � rl' 11�.iSXj�'�1�'� 1 •1 'f (, n � :��\ - nn , i� �� _ _.. _ � /�K v� \¢' �� � �� ,l �a ,� •{ �_ .I ��Y t '�'j � •I 1 �':� �� �� i�_:x.! _ � � J�t+. � .�, f• �'X � :.=e'�+�-;' �t�" +�R � i �, � � � �t° � �Fr Y's � +• � n ;�� �j{, �. � � � �..�r _ w * '4 -a. �". �,e �i•, '9� 9 �1 _ i .r�Z+' , . I . ,, r � . � ��,..� +).';! 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'i�"'i R �7 �q. . �- '�,1 �,� - f�r �`I•in �.�,�. .�„�?,�,+�•e�� �.� � k .��J��. � . �,�. � ( -_ _ ...��°' .�w_ ;b .a�. -TG'-��y� � . � � ' .. a......� . �Q. a .� �,� I .," .' `�' r r , N 0 ���-. 1:;Ei'�yl� t� ," .-7 � ��.,�)i�M.` ..u.a._ �'�. . , ,✓; ".."" I ' � �a� '�d,s, ���'y.�� .�.i�`� � � . , �'. . ,.✓ i y ;�' '_-t:�•-•._.y,Y �� d i �ON� ..' �,t..-.-CIFI {..�� � .. i.. �.� r. . ._Ju.i' !, . �,y.�iY,i � � •.-ti--� i ��Aa' .`` � � a ' r yY. � ���, �• �„_ �h�C{7�1f � � A � 4� 'i � � ' '.�- � �. ,r � '�^ �'�� � '�� /. S ��5 � �.. I ��� ��``Y,��� �. , 1 'y� f� � , �. . � � ... � .. � . r l:. 1 j `�4.IR^�+���!+w � • • �I�� , . . . , . . i+F'' S . �� �'� ,� �� � •��'� _ . U. S. DEPARTMENT OF AGRICULTURE SOIL CONSERVATION SERVICE KING COUNTY ARE SOIL LEGEND The iirst capVtal lener ie ehe �n�tial on�of tF+�eoil nort�. A second cap�ral 'errer, A; B,C, D. E,ar F, �nd�ca»a rhe class of slop�. Symboie w�thour a slop� lerrer are rhose oF nearly levsl so�ls. SYM80L NAME �.g13 4lderwooO gravelly sandy loom, 0�0 6 percen*slopes � --�j.�qgC qldarwood grovelly sandy loom,6 ro 15 pxcent slooes .�---- � Ag0 Aldenvood grav�lly sa�dy loom, 15 ro 30 psrcent slop�s AkF Aldarwood and Kitsap soils,very sreep Am8 Arents,Ald�rvvood maro�ial,0 ro 6 p�rcenr slopas� AmC �e�*s,Alderwood material,6�0 15 percenr slopes+ An Annts, Ev�r�te motanal• 9aC '�w�site gravslly sondy loom,6 ro 15 percenr slopes 3�0 3�avalt�grawily >andy lopm, 15 ro 30 Percenr slopee �. BeF d�ausita grav�lly sandy 4wm,40 ro 75 percent sloxs Bh B�Ilingham si�t loam � Br 3nscrn silt loam � 9u 9vckley silt loam '. �b :.00stol Bwches �a �orlmonf silf lonm cd Edgew�ck fine sendy loam E�8 Evere*r gravelly sandy loam,0�0 5 percenr s lop�s EvC Everett gravally sondy ioam, 5 ro IS oercent alopea =vD �veretr gravelly sondy loam, 15 ro 30 percent siopes EwC E�eren-Aldarwood gravelly sandy ioems, 6 ro 15 percent slooes 'nA !ndianola loamy FiM sand, 0�0 1 percenr slop�s -inC lndiaaola loamy fine sand, 4 ro 15 percear slopea InD Ind�unolo loomy fin�sond, 15 ro 30 percenr slopes Kp8 K�rsao silt loam,2 ro 8 percent slopes KpC Kirsap silt locm,8 to 15 percent slooes �'�00 �Cirsap silr laam, 15 ro 30 Dercenr slorxs KsC Kla�s gwvelly loamy sand,6 ro 15 percent slopes �Aa Uixed alluvlal IanC ":eC Nellron very grovelly loomy sond,2 to 15 percenr slooes Ng Vewoerg silt loam Nk Nooksack s�lt loom No Norma scndy loom �r Orcas paat Cs ;wid�a silt I�m OvC Ovall gravelly loom, 0 ro IS p�rc�nt siopss OvD Ovall gravally loam, 15 to 25 percent slop�s O�F O�all gravslly loom,�10 to 75 percenr slopes Pc ?ilchuck loomy fine sand Pk Pilchuck f�n�sandy loam ' P� Puger silry clay loam Py Pvyoflup fine sondy laam RaC Ragnar fins sandy loom,6 to 15�rcenr slopes RaD Ragnar fin�sandy loom, 15 ro 25 oercen�slooes RdC Ragnar-Ind�anola associatim,sloping� RdE Roqnar-Indionola oss«wtion, moderorely sreeo• Re R�nton s�it loom Rh Rl�arwash Sa Salel silr loam jh Samrtqm�eh s�lt loam Sk $eottl�mutk 5m $halcar mvck Sn Si silr loam $o jnohomish silt !mm $r :x�oi�omisn silt loom, mick suriace var.anr �u Sulton si�t '��oam `u 7ukwil0 muck �r 'Jrbon lond ��Yo Noodinv�lle s�lt loam • `he canposition of Hy�a umis �s more vonable•han rhat or me orhers in th�aao,but it has bs�n<ontroileC well enougn ro mreroror for rhe t CORE REQUIREMENTS Discharge at the Natu�al Location: The existing site drains to an existing I2 �nch culvert located at the north end of the s�te . The com�le}ed si�e wi?i drain to t"e sam,e :�cat�on . Of�site Analysis: This is presented in Sectien II� . No exisL�ng s�gnificar.t drainage systems we�e o�served on the site, and a discharge point meeting the requirements for concentrated flow exists on the north er.d of �he s'�e . Flow Contrcl : Detention is provided in accordance with `he "�99C Kir �; County Drainage Manual and City policies . A wet vau�t i_ proposed, which will provide �'ete^*ion �or ��in `o �he 1'�C year storm with a 30g = . - . _ . -�. -_. - a-�-, The post-developed site has a ma�imum discha�ge o� 2 . 16cf� for the 100 year storm. Because the capacity of a 12-ir.c:� ' pipe at 0. 5o slope is 2 .7cfs, all of the storm drains on i�� the site will be adequate. Therefore, there is r.o need for �,� � ��t.J.����. ar.�.- _� . � _r�.s���' a'� �G:; ..�'p�.r � .,+- ..l Because the maximum runoff travel d�stance is over 2�u feet, a sediment collection pond is required. Because the I size of the site is under 3 acres, the type of system used is a sediment trap. Maintenance and Operations: Because this systems employed for detention and water ' csality are all star.dard, the standard maintenance notes used in the 1998 King County Drair.age Manual are included in Section XI . �inancial Guarantees and yiability: All required guarantees wili be provided �hen reques�ed. �ater Q�ality: Fer City policies for tzis iccation, a wet vault will provide sufficient treatment . The calculations are inc�uded in Section IV. SPECIAL REQUIREMENTS Other Adopted Area-Specific Requirements: il No such areas are known �o affect *his si�e. � �'oodpla,�n/Floodway Delineation: The site does not contain, nor is it adjacent to a stream, I 'a�e, wet?and, or closed depression �lood Protection Facilities: The site is not adjacent to a Class 1 or 2 stream, nor does is propose to construct a new or modify and existinq flood protection facility. Source Controls: No special controls should be required for the site other than coverinq of dumpster areas, as no sources of Ncll�a�a�:ts are e�,�ec�ed. C�� �ontrcl : This is not a high use site, nor is it redeveloping an existing high use site. Therefore, special oil control :neasures are not reQuired. SECTION III OFF-SITE ANALYSIS OFF-SITE ANALYSIS Unstream: The only upstream azea draining onto the site is to the east. With the exception of the vegetated slope immediately adjacent to the site, the upstream properties are developed with commercial buildings and parking lots. The drainage systems for those parking lots appeaz to outfall onto the subject site, but no such outfalls or signs of concentrated flows were found. The topographic survey for the project shows an outfall from the southerly most property. This pipe will be connected to the storm drain in S 45th St. The other outfalls will be located sometime prior to construction and conveyed to the common collection point for the site at Davis Ave. The upstream basin consists of the area between the east property line of the site and Talbot Rd. It is approximately 2.3 acres in size. On-site: The site was visited in the fall of 2001 during a period of significant rainfall. Although the site was wet, with minor ponding occurring where equipment had been traveling for the purpose of soils explorations. No closed depressions or drainage channels were observed, except immediately upstream of the culvert under Davis Ave. which drains the site. The entire site, including the channel at the culvert intake is well vegetated, with no signs of erosion or sedimentation. The culvert intake showed no signs of ponding or overtopping. Downstream: As shown on the enclosed downstream maps, the culvert draining the site enters a storm drain ' system in Davis Ave. that was constructed in about 1982 with the Plat of One Valley Place. According to the construction drawings for the plat, the piping is 12 inch CMP at a 1% slope. ' This system drains into an 18 inch concrete pipe that goes north under S 43rd St. That culvert I connects to a storm drains system that continues north a distance of about 300 feet. At that ! point the storm drain outfalls to a channel that travels nvrth along the east side of the SR 167 right-of-way. This channel continues north to a point beyond '/4 mile downstream of the site, '� so the analysis ended there. I .�'�� ,a,.�;�,,:�,��:,.M,, ���� �� t� 's7b/+�e�"dl��,L1f � '�, ' , � � � ,,��, � , !����,+, � �CZ�.1,d�►�'9 "�`� � �,t, .�7 � -' , � • S ,. �,�. ' �,' � �'�� .{� � , � /�rN 4sa ���h ,�rsr _ 0 ' ��� �a' �� . , � . .. •. 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' , �I���%�' • • , �!�/ 1� . . �i�'""" . . �.,�"�'� ---_----- , � .,..--�� .. .., .� .� Predev Event Summary: BasinlD Peak Q Peak T Peak Vol Area Method Raintype Event (cfs) (hrs) (ac-ft) ac /�oss Predev 0.14_ 9.40 0.1395 2.77 SBUHlSCS TYPEtA 2 yr Predev 0.36- 8.67 0.2856 2.77 SBUHISCS TYPEIA 10 yr Predev 0.66- 8.50 0.4703 2.77 SBIfH/SCS TYPE1 A 100 yr Drainage Area: Predev Hyd Method: SBUH Hyd Loss Method: SCS CN Number Peak Fador. 484.00 SCS Abs: 0.20 Storm Dur: 24.00 hrs Intv� 10.00 min Area CN TC Pervious 2.7700 ac 81.00 1.01 hrs lmpervious 0.0000 ac 0.00 0.00 hrs Total 2.7700 ac Supporting Data: Pervious CN Data: � Predev 81.00 2.7700 ac Pervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Sheet First 300 feet 300.00 ft 3.30°k 0.4000 52.25 min Shallow Concentrated F1ow 240.00 ft 3.50% 3.OQ00 7.13 min I Postdev Event Summary: � BasinlD Peak Q Peak T Peak Vof Area Method Raintype Event (cfs} (h�s) (ac-ft} ac /loss Paatdev 1.00 7.83 0.3479 2.77 SBUH/SCS TYPEIA 2 yr Posidev 1.54 7.83 0.5433 2.77 SBUHlSCS TYPEIA t0yr Postdev 2.16 7.83 0.7655 2.77 SBUHISCS TYPEIA 100 yr Drainage Area: Postdev Hyd Method: SBUH Hyd Loss Method: SCS CN Number Peak Factor: 484.00 SCS Abs: 0.20 Sto►m Dur: 24.00 hrs Intv: 10.00 min Area CN TC Pervious 0.8000 ac 86.Q0 0.36 hrs Impervious 1.9700 ac 98.00 0.02 hrs Total 2.7700 ac Supporting Data: Pervioua CN Data: Pervious Area 86.00 0.8000 ac Impervious CN Data: Impervious Area 98.00 1.9700 ac Pervious TC Data: Flow type: Descnption: Length: Siope: Coeff: Travel Time Sheet Sheet Flow 160.00 ft 1.2596 0.1500 21.26 min Impervious TC Data: Flaw type: Description: Length: Slope: Coeff: Travel Time Shallow Parking Lot Surface 135.00 ft 2.00°�6 27.00OQ 0.59 min Channel Pipe Flow 140.00 ft 2.90°�6 42.Q000 0.33 min ' i Node ID: Vault Desc: Wet Vault Start EI: 100.0000 ft Max EI: 108.0000 ft Contrib Basin: Corrtrib Hyd: Length Wictth Void Ratio 76_0000 ft 2T .�fd ft 100.00 I '�'� '�a v f � Sc'�--c � YO v�c�ar l� Control Structure ID: Q�ifice -Multiple Orifice Structure I Desctip: Multiple Orifice L av�r a a t t o�� Start EI Max EI fncrerr�ent 100.0000 ft 108.0000 ft 0.10 Orif Coeff: 0.62 Bottom EI: 98.00 ft Lowest Diam: 1.6260 in � • n. � `�` �,c,t r<. ; out to 2nd: 3.9000 ft Diam: 2.6953 in 2nd to 3rd: 1.0300 ft Diam: 2.2559 in RLPCOMPUTE[Level Pool] SUMMARY 2 yr Match Q: 0.1410 cfs Peak Out Q: 0.1417 cfs-Peak Stg: 103.90 ft-Active Vol: 0.15 adt 10 yr Match Q: 0.3591 ds Peak Out Q: 0.3585 c#s-Peak Stg: 104.92 ft-Active Vol: 0.19 acft 100 yr Match Q: 0.6564 cfs Peak Out Q: 0.6559 cfs-Peak Stg: 106.36 ft-Active Vol: 0.24 acfit l� ` � ,�. �f��� POND DESIGN RESULTS Levd Pod Nade Ir�struction Sek Levd Pod � Starting Stage: '1� h Desiqn Event Matching Hyd %o�Rate Inflow Hyd Out Hyd 2 yr • Predev•Z yr • 100 Postdev•2 yr � out2 � Match Q:0.1410 cfs Peak Out Q:0.1417 cis-Peak St¢1�3.90 R-Active Vot Q15 acft _ _ _ _ _ _ 10 yr . Predcv-10 yr . 1(10 ;Postdev•10 yr .` ou110 . Match Q:0.3591 cFs Peak Dut Q:0.3586 cts-Peak Stg 104.92 ff-Active Vot 0.19 adt _ _ '100 yr • Predev-100 yr . 100 Postdev-100 y� • out100 •' Match Q:�.6564 cfs Peak Out Q:0.6559 cfs•Peak Stg 106.36 ft-Actn+eYok 0.24 acFt _ . . 100 • . I � `�� ' � • � , , , . i , , i � �. 4 L �< 'r'Vt+`G V� ��� �d 0 � � . .___._ - � E ., -, � ��} � a,� ^ /r� ��` � �^�� - Q,!.�� -'-.+ ., ,� _ �. � �J . / � �.� i � �� � � � i j',iJ A `� r �' { � p/ �1 � 1 C iT'l Q V� t�=t, � .. � /`F . // � O O �{ 1 'vk(� "7 `� ;t[ 0 Ci� J� Cc�l'�C� � � cc n. ,.r� o �.��� � t.ff, �.C, . S''�O`r"w'• .:= �� � 4' �Z .� .�. � a � c ' � �':j 5 s!!^ �';l .�r►\I�t` J1�^�'� "'r.17 J�V�O(;� � I" y �` � � � �Y�M , ;,v^C� .�L"'f – ((��{� � /� ���–�j^ �D J � –��',,�� �n � gc%, „ ' � � � o c i r _ — � �"; Z W � � ��t�rl �� 1 �� t ��1 r � �„�1� �t " Js� : . � G.. v /� c�-v a.� �e�F�-�. _ `�,Z` >7 �S► 7 � �9 ��� J . ` r i' 1� �.n^^ %' �t- ,.v. C� .���� �,,1,� ' �,, .% , � � � . ti r., � /L i � y'��•, y�or`,r;' :"�— ' + v'} r �r^ � 7 0._s.�r+ , \ .,�. "'^�G �.�N .'��► �, �� �.: / � �d :. � � E � � . Z.5 °�� .�� �O � � O� S �� CU �� E r �� �r tl�l i�cl SQ�i r 2. 3 t �1� `L4-'(.✓ X �tC� _ �� o.S� C ti �� � �� 3 d Y I (' r TO q . ��O V�..wt �Q V"�V:�Y CL � ��. = � ��L. 1C Z. �{�.[> 1G `��C4 - CO�o Z� Ct.( �� , G�. Z � � �S � � � � � � C✓9 4 1Mt�.s p<<� t-� o T ` c r� ! r t�� � i�C t�sA� �p� (i1r(4 it V 21 ,� - _ — -".--__ -- --.____---. - - ------,� - � ( � 1 � ^, - �-- �` r � �-+ L:�G l�4 l �=G'��'-�,; ''`.r.`'�.�,- •� t ! i ; � � . ,,�p. � .�� rC.( , _ �-7F , ,t X c.t t�al�- .: �� S'd i ti,n,o�..�' ���� �'�.. . I l� V fY YG} i� t.� 1 -I � � r�` •`� �� f � �� ` Q �I� ( �J � I I I Postdev Event Summary: BasinlD Peak Q Peak T Peak Vol Area Method Raintype Event ------ (cfs) (hrs) (ac-ft) ac /Loss Postdev 0.24 7.83 0.0820 2.77 SBUH/SCS TYPEtA WQ STORM ` 1�J -'� ° = � .: � r.. � '.� .+._`� SECTION IX EROSION/SEDIMENTATION CONTROL DESIGN EROSION/SEDIMENTATION CONTROL DESIGN Th�s section includes the caiculation for the sediment trap pond size. Other methods employed include silt fences, yround cover techniques, gravel construction entrance, and downst�eam catch basin filter inserts . IInless unusual problems are e^coun*ered during construction, or unless winter grading is �one, no flocculation, fil�ering, or cther more aggress�ve methods should be required. i i i � { i � i � i i � ! ^ ; ���. ,, ; ��: ; �� i ' � � � � � � ( N N N N N P- i � I AN-Ar i -ti a�T'� �-� ��,��sy� 48 G Z. "'o cn ,C $ac � �,r'`v N^, n �'': �1^, ��.✓' •1 � �� �'D� �� ►yy���i s -+7 �� �h.�.^ " tA Vi U i � + �� � / ', mmm , mmm —�—s— i ; cnwv' i � � 4SGtZ = �O� p��C� _ (O8P2� Z'�j �. -�� S j � r \ , I ��o/1 vf�yV! �3�o Y:�S�J� �� � � i � "' 1 ' �' -� '-S 'D JTi {� _11 � � a ,.. i ! .. i � '�' G' ' � �y a��}� �v� �� c }= r� e.�� � s c�f .a � -L , � n �—__. i � �.� � ..� �J . . :r ..�-r �Y, aY►�,��� �5 �� -�;. , i � � ; , ��. �� -----. - - � , J i SECTION X '� BOND QUANT I T IE S Site Improvement Bond Quantity Worksheet . King County Department of Qevelopment 8 Environmental Services 900 Oakesdale Avenue Southwest Renton, Washinaton 98055-1219 Pro�e�t ruame: Chateau Valley Center Date: 28-Apr-03 l.ocation: Davls Ave. S. & S 45th St. Project No.: 0005-03 Activity No.: Note: All prices include labor, equiprrient, materials, overhead and Clearing greater than or equal to 5,000 board feet of timber? profit. Prices are from RS Means data adjusted for the Seaitle area or from local sources if not included in the RS Means database. yes no If yes, Forest Practice Permit Number: (RCW 76.09) Page 1 of 9 bond quantities.xls Site Improvement Bond Quantity Worksheet � _ Unit _ #of Reference#� Price Unit Quant A lications Cost � EROSIO ISEDIMENT CONTRO Backfill & com action-embankment $ 5.62 CY Check dams, 4"minus rock SWDM 5.4.6.3 $ 67.51 Each Crushed surfacin 1 1/4"minus WSDOT 9-03.9(3 $ 85.45 CY ' Ditching $ 8.08 CY Excavation-bulk $ 1.50 CY Fence, silt SWDM 5.4.3.1 $ 1.38 LF 643 1 887 Fence, Tem ora (NGPE) $ 1.38 LF H droseedin SWDM 5.4.2.4 $ 0.59 SY Jute Mesh SWDM 5.4.22 $ 1.45 SY Mulch, b hand, straw, 3"dee SWDM 5.4.2.1 $ 2.01 SY Mulch, b machine, straw, 2"deep SWDM 5.4.2.1 $ 0.53 SY 4000 2 4240 Pipin , tem ora , CPP,6" $ 10.70 LF Pi in , tem ora , CPP,8" $ 16.10 LF Pi in , tem ora , CPP, 12" $ 20.70 LF Plastic coverin ,6mm thick, sandba ed SWDM 5.4.2.3 $ 2.30 SY 277 2 1274 Ri Ra , machine laced; slo es WSDOT 9-13.1(2) $ 39.08 CY Rock Construction Entrance, 50'x15'x1' SWDM 5.4.4.1 $ 1,464.34 Each Rock Construction Entrance, 100'x15'x1' SWDM 5.4.4.1 $ 2,928.68 Each 1 1 2929 Sediment ond riser assembl SWDM 5.4.5.2 $ 1,949.38 Each Sediment tra , 5' hi h berm SWDM 5.4.5.1 $ 17.91 lF 90 1 1612 Sed.trap,5'hi h,riprapped spillway berm section SWDM 5.4.5.1 $ 68.54 LF 10 1 685 Seedin , b hand SWDM 5.4.2.4 $ 0.51 SY Soddin , 1"dee , level round SWDM 5.4.2.5 $ 6.03 SY Soddin , 1"dee , slo ed round SWDM 5.4.2.5 $ 7.45 SY TESC Su ervisor $ 74.75 HR 16 1 1196 Water truck, dust control SWDM 5.4.7 $ 97.75 HR 16 1 1564 W ITE-IN-ITE ,r.** e , _ Each ESC SUBTOTAL: $ 14,387.52 30%CONTINGENCY 8� MOBILIZATION: $ 4,316.26 ESC TOTAL: $ 18,703.78 COLUMN: A Page 2 of 9 bond quantities.xls Site Improvement Bond Quantity Worksheet Facisting Future Pubtic Private Quantity Completed __ RigM-of•Way Road Impravementa Improvernents (Bond Reduc4on�' . d�D�ai e Facilitie� Quant. Unit P►ice Unit Quant, Cost Quani. Cost Quatrt. Cost Com ete Cost GE ERALIT� Backfill 8,Com action-embankment 3 5.62 CY 2870 16,129.40 Backfill 8 Com action-trench $ 8.53 CY 284 2 422.52 Clear/Remove Brush,b hand S 0.36 SY Ciearin Grubbin ree Removal $ 8,876.16 Acre 2.77 24,586.96 Excavation-bulk 3 1.50 CY 2155 3,232.50 Excavation Trench S 4.06 CY 284 1,153.04 Fencin ,cedar,6'hi h $ 18.55 LF Fencin ,chain link,vin coated, 6'h h S 13.44 LF Fencin ,chain link, ate,vin I coated, 20' S 1,271.81 Each ' Fencin ,s lit rail,3'hi h $ 12.12 LF Fill 8 com act-common barrow 3 22.57 CY Fill&com act- avel base $ 25.48 CY Fill 8 com act-screened to soil $ 37.85 CY Gabion, 12"ciee ,stone filled mesh $ 54.31 SY Gabion, 18"dee ,stone fiUed mesh $ 74.85 SY Gabion,3fi"dee ,stone filled mesh $ 132.48 SY Gradin ,fine,b hand $ 2.02 SY Gradin ,fine,with rader $ 0.95 SY 13400 12,730.00 Monuments,3'lon $ 135.13 Each Sensitive Areas Si n $ 2.88 Each Soddin , 1"dee ,slo ed round 3 7.46 SY Surve i ,line 8 rade $ 788.26 Da 5 3,941.30 Surve in ,lot IocatioMines S 1,556.64 Acre 2.77 4,311.89 Traffic conVol crew 2 fla ers $ 85.18 HR 16 1 362.88 Trail,4"chl ed wood $ 7.59 SY Trail,4"crushed cinder $ 8.33 SY Trail,4"to course $ 8.19 SY Wall,retainin ,concrete $ 44.16 SF 1750 77,280.00 Watl,rockery S 9.49 SF Page 3 of 9 SUBTOTAL 147,150.50 Unit pnc:es upda►ed: 02/12102 'KCC 27A authorizes only one bond reduction. Version: 4/22/02 bond quantities.�ds Report Date:4/28/2003 I Site Improvement Bond Quantity Worksheet • �xisting " �'uture Pubfic " Private Bcnd tteductfon" , _ Right�ol�wAy Road Improvements Improvaments _ - d��raina e FacilKies Qua�t - Unit Price Unit 4uant. Coet ' Quant. Cost QuaM. Co$t Eam lete Cost A IMPROV NT _ , AC Grindin ,4'wide machine<1000s $ 23.00 SY AC Grindin ,4'wide machine 1000-2000s $ 5.75 SY AC Grindin ,4'wide machine>2000s $ 1.38 SY AC RemovaUDis osaURe air $ 41.14 SY 13 534.82 Barricade, e I $ 30.03 LF BaRicade, e 111 Permanent $ 45.05 LF Ciub&Gutter,rolled $ 13.27 LF Curb 8 Gutter,vertical S 9.69 LF 75 728.75 ! Curb and Gutter,demoGtion and dis osal $ 13.58 LF Curb,ezVuded as halt $ 2.44 LF Curb,extruded concrete $ 2.56 LF Sawcut as halt,3"de th $ 1.85 LF 75 138.75 Sawcut,concrete, er 1"de th $ 1.69 LF Sealant,as halt $ 0.99 LF Shoulder,AC, see AC road unit rlce $ - 3Y Shoulder, ravel,4"thick $ 7.53 SY Sidewalk,4"thick $ 30.52 SY Sidewalk,4"thick,demoliUon and dis osaf $ 27.73 SY i Sidewalk,5"thick $ 34.94 SY 75 2,620.50 '� Sidewalk,5"thick,demolition and dis osal $ 34.65 SY '� Si n,handica $ 85.28 Each 'Sui in , er stall $ 5.82 Each Stri in ,thermo lastic, for crosswalk) $ 2.38 SF Striping,4"reflectorized line $ 0.25 LF Pa�e 4 of 9 SUBTOTAL 4,020.82 Unit prices updatrsd: 02/t2/02 'KCC 27A authonzes only one bond reduction. VefsiOn: 4/22/02 bond quanti6es.�ds Report Dete:4/28/2003 Site Improvement Bond Quantity Worksheet , �xisting Future pubNc . Private 8ond Reduction' RigM�of-way Road Improvements Improvements , 14 Draina e fucitities Quant. Unit Pdce Unit Quant. Cost Quant. Cost Quafi. Cost Com lete Cost F ( (9"Rack#2.5 base d� 1,6"top course) ' For'93 KCR6(6.5"Rock�8"base 8�f.5"top course) ' '' For KCRS'93, additional 2.5"base add: $ 3.60 SY AC Overla , t.5"AC $ 7.39 SY AC Overla ,2"AC S 8.75 SY AC Road,2",4"rock,First 2500 SY S 17.24 SY AC Road,Z",4"rock,Q .over 2500SY S 13.36 SY AC Road,3",4"rock,First 2500 SY S 19.69 SY AC Road,3" 4"rock,Q .over 2500 SY S 15.81 SY AC Road,5",First 2500 5Y $ 14.57 SY AC Road,5",Q .Over 2500 SY s 13.94 SY AC Road,6",First 2500 SY S 16.76 SY 17 284.92 AC Road,6",Q .Over 2500 SY $ 16.12 SY As hak Treated Base,4"thick $ 9.21 SY 17 156.57 Gravel Road,4"rock,First 2500 SY $ 11.41 SY Gravel Road,4"rock,Q .over 2500 SY S 7.53 SY PCC Road,5" no base,aver 2500 SY $ 21.51 SY PCC Road, 6",no base,over 2500 SY $ 21.87 SY Thickened Ed e S 6.89 LF Page 5 of 9 SUBTOTAL 441.49 � Unitpncesupdated. 02/12/02 , 'KCC 27A authorizes only one bond reducdon. Version: 4/22/02 bond quantlties.�ds Report Date: 4/28/2003 Site Improvement Bond Quantity Worksheet . ��uiating Futur�Pubiic Private 8ond Roductan` Right�f-wey Road Improvemerrts Imprvvements - 8 Draina e Facilities Quant. Unit Price Unit Quant: Coat Quent. Cost Quant. Cost Com lete Cost DRAI E (CPP=Cplrugated plastic Pipe,N�2 or EquivaleM) FcK Culvart prices,'Aver ot 4'caverwas a�s�uned Rr�wme wwted PVC is�ame wo sc�ici Access Road,R/D $ 16.74 SY Bollards-fixed $ 240.74 Each Bollards-removable 3 452.34 Each ' CBs include frame and Gd C8 T e I S 1,257.64 Each 9 11,318.76 CB T e IL $ 1,433.59 Each CB T e II,48"diameter S 2,033.57 Each 3 6,100.71 for additional de th over 4' $ 436.52 FT 7 3,055.64 CB T e II,54"diameter $ 2,192.54 Each fw addi6onal de th over 4' $ 486.53 FT CB T e II,60"diameter $ 2,351.52 Each for addiUonal de th over 4' S 536.54 FT CB T e II,72"diameter $ 3,212.64 Each for additlonal de th over 4' $ 692.21 FT Throu h-curb Inlet Framework Add $ 366.09 Each Cleanout,PVC,4" $ 130.55 Each Cleanout,PVC,6" $ 174.90 Each Cleanout,PVC,8" $ 224.19 Each Culvert,PVC,4" S 8.64 LF CuNert,PVC,6" $ 12.60 LF Culvert,PVC, 8" $ 13.33 LF Culvert,PVC, 12" $ 21.77 LF Culvert,CMP,8" $ 17.25 LF Culvert,CMP, 12" $ 26.45 LF Culvert,CMP,15" S 32.73 LF Culvert,CMP, 18" S 37.74 LF Culvert,CMP,24" $ 53.33 LF Cidvert,CMP,3U" $ 71.45 LF Culvert,CMP,36" $ 112.11 LF Culvert,CMP,48" S 140.83 LF Culvert,CMP,60" $ 235.45 LF Culvert,CMP,72" $ 302.58 LF Page 6 of 9 SUBTOTAL 20,475.11 Unit prices updated: 02/12/02 'KCC 27A authorizes only one bond reduction. Version: 4/22/02 bond quantities.�ds Report Date: 4/28/2003 Site Improvement Bond Quantity Worksheet , _ �x7sting future Public Private Bond Reduction' _ Right�i-way Rosd Improver�errts Improvements , DRAINAGE ONTINUEO &D�aina e FaciHties Quant. Unit Price Unit Quant: ' Cpst Quant. Cos� Quant. Gost Com lete C�ost Culvert,Concrete,8" $ 21 A2 LF Culvert,Concrete, 12" $ 30.05 LF Culvert,Concrete,15" $ 37.34 LF CWvert,Concrete, 18" S 44.51 LF C��Ivert,Concrete,24" $ 61.07 LF Culvert,Concrete,30" $ 104.18 LF Cidvert,Cuncrete,36" $ 137.63 LF Culvert,Concrete,42" $ 158.42 LF Cidvert,Concrete,48" 3 175.94 LF I Culvert,CPP,6" $ 10.70 LF CuNert,CPP,8" $ 16.10 LF 143 2302.3 Culvert,CPP, 12" $ 20.70 LF 821 16994.7 C�dvert,CPP, 15" S 23.00 LF Culvert,CPP,18" $ 27.60 LF Culvert,CPP,24" $ 36.80 LF Culvert,CPP,30" S 48.30 LF I Culvert,CPP,36" $ 55.20 LF Ditchin $ 8.08 CY ' Flow Dis ersal Trench t,436 base+) $ 25.99 LF French Drain 3'de th $ 22.60 LF Geotextile,laid in trench, ol ro ene $ 2.40 SY Infdtration ond tes6n S 74.75 HR Mid-tank Access Riser,48"dia, 6'dee $ 1,605.40 Eech i Pond Overtlow S illwa $ 14.01 SY Restrictor/Oil Se arator,12" $ 1,045.19 Each 1 1045.19 Restricta/Oil Se arator, 15" $ 1,095.56 Each Restrictor/Oil Se arator, 18" $ 1,146.16 Each Ri ra , laced � 39.08 CY j Tank End Reducer 36"diameter S 1,000.50 Each � Trash Rack, 12" $ 211.97 Each Trash Rack, 15" $ 237.27 Each Trash Rack, 18" $ 268.89 Each Trash Rack,21" $ 306.84 Each Page 7 of 9 SUBTOTAL 20342.19 Unit pnces updated: 02/12l02 'KCC 27A authorizes only one bond reduction. Version: 4/22/02 bond quantities.�ds Repoii Date: 4/28/2003 Site Improvement Bond Quantity Worksheet , _ Ex1at'tng Futur�Public Private Band Reduction• Right-pf•way Road hnprovements improvements 8 Draina e Facilities Quant. Unit PRce Ur1it Quant. Price Quent. Cost Quent. Coat Com lete Cost P RKIN L RFACI G , 2"AC,2"to course rock&4"borrow $ 15.84 SY 2"AC, 1.5" to course 6 2.5"base course $ 17.24 SY 4"select bonow $ 4.55 SY 1 5"to course rock 8 2.5"base course $ 11.41 SY T -I - DetentioNwet Vaufl $80,000.00 EA. 1 80,000.00 EA. LF EA. EA. ' EA. LF SF LF LF SUBTOTAL 80,000 00 � SUBTOTAL(SUM ALL PAGES): 4,462.31 267,967.80 30%CONTINGENCY 3 MOBILIZATION: 1,338.69 80,390.34 GRANDTOTAL: 5,801.00 348,358.13 COLUMN: B C D E Page 8 of 9 Unit prices updated: 02/12/02 'KCC 27A authorizes only one bond reducGo�. Version: 4/22/02 bond quantities.�ds Report Date:4/28/2003 Site Improvement Bond Quantity Worksheet � Original bond computations prepared by: I Name: Chateau VaUey Center Date: �1; PE Registration Number: 15182 Tel.#: 425• Firm Name: Site Development Services Address: 310 208th St. SE, Bothell, WA. 98012 Project No: t)� ROAD IMPROVEMENTS&DRAINAGE FACILITIES FINANCIAL GUARAN7EE REQUIREMNE PERFORMANCE BOND" PUBLIC kC AMOUNT BOND'AMOUNT MAINTENAFH REQUIRED AT RECORDING OR Stabilization/Erosion Sediment Control(ESC) (A) $ 18,703.8 TEMPORARY OCCUPANCY"` Existing Right-of-Way Improvements (6) $ 5,801.0 Future Public Road Improvements& Drainage Facilities (C) $ - Private Improvements (D) $ 348,358.1 Calculated Quantity Completed (E) $ - Total Right-of Way and/or Site Restoration Bond"/"' (A+g) $ 24,504.8 (First$7,500 of bond"shall be cash.) Performance Bond*Amount (A+g+C+D) = TOTAL (T) $ 372,862.9 T x 0.30 $ 111,858.9 OR Minimum ond•amount is 0 . Reduced Pertormance Bond*Total*** (T-E) $ 372,862.9 Use larger of x30%or{ -E) (B+C)x Maintenance/Defect Bond*Total 025= $ NAME OF PERSON PREPARING BOND�RE�ucTio►v: David C. Doughert�r Date: _� "NOTE: The word"bond"as used in this document means any financial guarantee acceptable to King County. ""NOTE: KCC 27A authorizes right of way and site restoration bonds to be cornbined when both are required. The restoration requirement shall include the total cost for all TESC as a minimum,not a maximum. In addition,correc6ve work,both on-and off-site needs to be ica Quanti6es shall reflect warse case scenarios not just minimum requirements. For example,if a salmonid stream may be damaged,some estimated costs for restor� needs to be reflected in this amount. The 30%contingency and mobilization costs are computed in this quantity. Rtk NOTE: Per KCC 27A,total bond amounts remaining after reduction shall not be less ttian 30%of the original amount(T)or as revised by major deslgn changes. SURETY BOND RIDER NOTE: If a bond rider is used,minimum additional performance bond shatl be $ 348,358.1 (C+D)-E REQUIRED BOND'AMOUNTS ARE SUBJECT TO REVIEW AND MODIFICATION BY DDES Page 9 of 9 bond quantities.xls SECTION XI MAINTENANCE AND OPERATIONS MANUAL MAINTENANCE & OPERATIONS iYIANUAL I Detention Vault: I Keep all vents and grates clear of debris. Clean out vault in accordance with enclosed requirements. Reseal all joints and seals if leaking. Replace aIl damaged, �veak, or broken ladder rungs. Catch Basins: � Check annually. Clean out sediment in accordance vvith enclosed requirements. Repair any cracked or leaking joints and seams around catch basin sections and the pipes. See the following pages for further maintenance and aperation procedures. � I :�PPENDI;C A �tAINTE:�IA�CE STAIVDARDS FOR PRiV,aT'EI,Y VtAINTAIIYED DR,�ItiAGE FACIi.ITIES I NO. 3-CLOSED DETENTION SYSTEMS(PlPES1TANKS) Maintenance Defect Conditions When Maintenance is Needed Results Expected When Component Maintenance is Performed Storage.�rea ?luggea Air Vents One-half ot me cross section of a vent is blocKed at lents tree ot debns and ' any paM wiih debns and sediment sediment Debris and Accumulated sediment depth exceeds 10"0 of the All sediment and debris Sediment diameter ot the siorage area for'fz lenqth of siorage removed from storage area. vault or any point depth exceeds 159'a of diameter. �xamole:72-inch storage tank would reqwre clean�ng when seaiment reaches depth of 7 inches for more than�Fz length of tank. Joints 8etween Any craCk allowmg material to be Vansported into :�II jo�nt between tank/pipe TanWPipe Section facility sections are sealed Tank Pipe Bent Any part of tanWpipe is bent out of shape more than TanW pipe repaired or replaced Out of Shape 109'e of it's des�gn shape to design. Manhole Cover Not in Place Cover is m�ssing or only partially in place.Any open Manhole is dosed. manhole requires mamtenance. Lodcing Mechanism cannot be opened by one maintenance Mechanism opens with proper Mechanism Not person v+nth proper tools.Bolts into frame have less tools. Working than�h inch of thread(may not apply to self-locking lids.) Cover Difficult to One maintenance person cannot remove lid after Cover can be removed and Remove applying 801bs of lift. Intent is to keep cover from reinstalled by one maintenance sealing off access to maintenance. person. Ladder Rungs King Counry Safery Otfice and/or maintenance person Ladder meets design standards Unsafe judges that ladder is unsafe due to missing rungs, allows maintenance person safe misalignment,rust,or cradcs. access. Catch Basins See"Catch Basins'Standards No.5 See"Catch Basins"Standards No.5 ;998�uriace Water Design��lanual 9/U98 A-3 APPEVDIX.a �IrUNTENANCE STANDARDS FOR PRIVATELY ViAINTAINED DR�INAGE FACILITIES NO. 4- CONTAOL STRUCTURE/FI.OW RESTRICTOR �daintenance Defect Condition When Maintenance is Needed Resufts Expected When Companent Maintenance is Pertormed ' General Trash and Debns Distance between debns budd-up and bortom of All trasn ana debns removed. (Incluaes Sediment) onfice piate is less than t-1/2 feet Stn�ctural Damage Structure is not securety attact�ed to manhole wall Structure securely attached to and outlet pipe structure should support at least wall and outlet pipe. 1,000 Ibs of up or down p�essure. Structure is not in upnght position(allow up to SUucture in correct posrtion. t09'o from plumb). Connections to outlet pipe are not watertight and Connections to outlet pipe are show signs of rust. water tignt;struciure repaired or reptaced and wo�ics as cesigned. Any holes—other than designed holes—in the Structure has no holes other stn�cture. than des�gned holes. Cleanout Gate Damaged or Missing Cleanout gate is nat watertight or is missing. Gate is watertight and works as designed. Gate cannot be moved up and down by one Gate moves up and dovm easily maintenance person. and is watertight. Chain leading to gate is missing or damaged. Chain is designec Gate is rusted over 50%of its surface area. Gate is r� meet des�gn stancares.. �rifice Plate Damaged or Missing Contrd device is not wortcing property due to Plate is in place and works as missing,out of ptace,or bent orifice plate. designed. Obstructions Any trash,debris,sediment,or vegetation Plate is free oi all obstructions bloclting the plate. and works as designed. Overflow Pipe Obstructions Any trash or debris bfocking(or having the Pipe is free of all obstructions poten5ai of blocldng)the overtlow pipe. and works as designed. Manhole See'Closed Deten6on Systems"Standards No.3 See"C�osed Detention Systems' Standards No.3 Catch Bas1n See"Catch Basins"Standards No.5 See'Catct►Basins"Standards No.5 9I1/98 1998 Surface Wa[er Desisn Manual �-1 , :�PPENDI:C.a �1�INTE�1,�+,NCE ST,a.'�lDARDS FOR PRIV�TEL,Y�4,aIM.aINED DRAINAGE FACILITIES • NO. 5- CATCH BASINS vlaintenance Defect Conditions When Maintenance is Needed Results Expected When Componeni Maintenance is performed General -rasn 3 Oebns Trasn or cenns of more than i!2 cuoic toot wrncn is �o Trasn or deDns IocateU (Includes Sediment) located immediately in front of the catcf�basm :mmediately in front ot catch opening or is blocking capaciry of the basin by basin opening. more than 10°'a Trash or debns(in the basin)that exceeds 1/3 the No trash or debris in the catch depth from the bottom of basin to invert the lowest basin. pipe into or out of the basin. Trash or debns in any inlet or oWet pipe blodting Inlet and outlet pipes free of more than 1/3 of its height trasn or debris. Dead animals or vegetation that could generate No dead animals or vegetation odors that could cause complaints or dangerous present within the catch basin. gases(e.g.,methane). Deposits of garbage exceeding 1 cubic foot in No condition present which volume would attract or support the breeding of insects or rodenLs. Structure Damage to Comer of frame extends more than 3/4 inch past Frame is even with curb. Frame andlor Top Slab curb face into the street(If applicable). Tap slab has holes larger than 2 square inches or Top slab is free of holes and cracfcs wider than 1/4 inch(intent is to make sure cracks. all matenal is mm�ing into basin). Frame not sitting flush on top sfab,i.e.,separation Frame is sitting flush on roo , of more than 3/4�nch cf the trame from the'op slab. sla�. Cracks in Basin Walls! C�acks wider than 1i2 inch and longer than 3 teet, Basin replaced or repairea'o i� Bottem any evidence of soil par6Ges entenng catch basin desgn standards. through cradcs,or maintenance person judges that struc:ure is unsound. , Cracks wider than 1/2 inch and longer than 1 foot No cracks more than 1/4 inch I at the joint of any inleU outlet pipe or any evidence wide at the jant of inleVoutlet of soil partides entenng catch basin through pipe. cracks. SedimenU Basin has settled more tfian t inch or has rotated Basin replaced or repaired to Misalignment more than 2 inches out of alignment design standards. 1998 Surrace Water Design:vlanual 9/]/98 :�-� . I aPDEVD[Y.a M:�IM'ENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILTtIES NO. 5-CATCH BASiNS(CONTlNUE� Maintenance Defect Conditions When Maintenance is Needed Results Expected When Component Maintenance is pertormed =ire Hazara Presence of chemicals such as natural gas,od and No tlammable cnemiCals gasoline. present_ Vegetation Vegera5on growing across and blocking more than No vegetaoon bbcking opening 10°Je of the basin openmg. to basm. Vegetation growing in inleUoutlet pipe joints that is No vegetation or root growth more than six inches tall and less than s�x incnes present. �� Pollution Nonflammable diemicals of more than 1/2 cubic foot No oollution present other than ' per three feet of bas�n length. surtace film. Catch Basin Cover Cover Not in P1ace Cover is missing or only partialty in place.Any open Catch basin cover is dosed catch basm requires maintenance. Locking Mechanism Mechanism cannot be opened by on maintenance Mechanism opens with proper Not Workmg person with proper tools.Bolts into frame have less tools. than 1/2 inch of thread. Cover DifficWt to One maintenance person cannot remove lid after Cover can be remove: : . - - Remove applying 80 Ibs.of lift;intent is keep cover from maintenance person. sealing off access to maintenance. Ladder Ladder Rungs Ladder is unsafe due to missing rungs,misalignment, Ladder meets design stanaares Unsafe rust,cracks,or sharp edges. and albws maintenance person safe access. Metal Grates Grate with opening wider than 7/8 inch. Grate opening meets design (lf Applicable) standards. Trash and Debris Trash and debris that is biocking more than 20°a of Grate iree of trasn and debns. grate surface. Damaged or Grate missing or broken mem�er(s)cf the grate. Grate is in place and meets Missing. design standards. O. 6 DEBRIS BARRIEr�S (E.G.,TRASH RACKS) Maintenance fect Condition When Maintenance is Needed Results Ex hen Components M ' nce is Performed. General Trash and Debns Trash or debns that is pluggmg more /o of Barrier clear to receive capacity nings in the bamer. flow. Metal Damaged/Missing re bent out of s ore than 3 inches. Bars in place with no bends more Bars. than 3/4 inch. Bars are missing or entire barrier missing. Bars in place acc:ording to design. Bars are loose and rust is causing 50%detenoration r o�replace barrier to to any part of bamer. design s. 9!1/98 1998 Suriace Wazer Design�fanuai , � i � APPENDIX A �1AII�'TENANCE STANDARDS FOR PRIV�TELY�4AIIvT.�INED DR.�INAGE FACILITIES II I N0. 10-CONVEYANCE SYSTEMS(PIPES & DITCtiES) Maintenance Defect Conditions When Maintenance is Needed Results Expected When Component Maintenance is Performed Pipes Seaiment�Debris Accumulated seCiment that exceeds 20%of the Pipe cteanetl of a�l sea�ment diameter of the pipe. and debns. Vegetation Vegetavon that reduces free movement of water r11i vegetation removed so water througn pipes. flows freely through pipes. Damaged Protectrve coating is damaged;rust is causing Pipe repaired or reptaced. more than 509'o deLenoration to any part of pipe. Any dent that decreases the cross section area of Pipe repaired or replaced. pipe by more than 20%. Open Ditches Trash&Debris Trash and debris exceeds t cubic faot per 1,000 Trash and debns dearea from square feet of di0ch and slopes. ditches. Sediment Accumulated sedimeM that exceeds 20°o of the Ditch deaned/flushed of_.I design depth. sediment and debris so�hat�t matches design. Vegetation Vegetation that reduces free movement of water Water flows freely through through ditches. ditches. Erosion Damage to See°Ponds"Standard No.1 See"Ponds'Standard No. 1 Slopes Rock Lining Out of Maintenance person can see native soil beneath Replace rocks to design Place or Missing (If the rock lining. standards. Applicablej. Catch Basins See"Catch Basins:Standard No.5 See"Catch Basins'Standard No.5 Debris Barriers Sae"Debris Barriers'Standard No.6 See"Debns Bamers'Standard (e.g.,Trash Rack) No.6 N0. 11 -GROUNDS (LANDSCAPING) Maintenance Defect Conditions When Maintenance is Needed Results Expecied Whe Component Mai�tenanca is P rmed General Weeds '�/eeds growing in more than 20"a of the lanascaped W esent in less than 5°6 ;Nonpoisono area(trees and shrubs onfy). e landscaped area. Safety Hazard y presence of poison ivy or other pa No poisonous vegetaUon ve tion. present in landscaped area. Trash or Litter ?aper,cans, es,to ' more than 1 cubic foot Area clear of litter. withm a landsc ea(trees and shrubs only)of 1,000 squar et Trees and Shrubs Oamaged s or parts of trees or shrubs are split o� Trees and shrubs with less than broken which affect mora than 25%of total 5%of total foliage with split or foliage of the tree or shrub. broken limbs. Trees or shrubs that have been bbwn down or ee or shrub in place free of knocked over. inju . �rees or shrubs which are not adequately supported Tree or shrub i lace and or are leaning over,causing exposure of the roots. adequately suppoR - emove any dead or diseased v 1998 Surtace Wacer Des�gn Manual 9/1�98 :�-9 . .�PPENDIX A ViAfiVTENA,ti'CE ST,�NDARDS FOR PRIV.�TELY�IAIN'faINED DRAINAGE FACII.;T'IES � N0. 13-WATER QUALITY FAC1LI11ES (CONTINUED� � i D.) Wetvaults ' Maintenance Defect Ca�dition When Maintenance is Needed Results Expected When Camoonent Maintenance is Pertormed Wetvault 'rasn/Debris Trasn and debns accumulated in vaWt,plpe or Trash and debns removed from Accumulanon inleV ouUet,(includes floatables and non- vauit floatables). Sediment Accumulation Sediment accumulation in vault bottom that Removal of sediment from vault in Vault exceeds the depth ot the sediment zone plus 6- inches. Damaged Pipes In1eU outlet piping damaged or broken and in Pipe repaired andl or repiaced. need ot reoair. Access Cover Cover cannot be opened or removed,especially Pipe repaired or replaced to Damaged/Not Worldng by one person. proper wortdng specifications. Vault Structure Vault:Cradcs wider than 1/2-inch and any No cracks wider than t/4-inch at Damaged evidence of soil partides entering the structure the joint of the inlet/outlet pipe. through the cracks,or maintenance/inspection Vault Is determined to be personnel detemunes that the vautt is not structurally sound. structuraly sound. Baffles Baffles corroding,cracking,warping and/o� Repair or replace baffles to showing signs of failure as determined by speafications. maintenance!inspection staff. Access Ladder Damage Ladder is corroded or detenorated,not functioning Ladder replaced or repaired to properly,missing rungs.has cradcs and/or speafications,and is safe to misaligned. use as detertnined by inspection personnel. 1998 Suriace Water Des���lanual 9/1i98 :�-13 J .�PPE`D[X .a `1.-�tiTE�i..�VC:�T.y\D�RDS FOR PRIV.a'i�'L': .`:1.-�Ii�'T.�ItiED DR.�IN�Gt E.�C�.:?'IE� � N0. 14-OIL CONTROL FAC1L1T1ES(CON77NUED) A. OiU` er Se arators Continued) Maintenance Defeci Condition When Maintenance is Needed ResulLs Expected When Component Maintenance is Perfo ed Dama d Coalescing Plate media oroken,deformed,cracked and/or Repiace tha rtion of ineaia Plates showmg signs of`ailure. padc or re ptate pack de ing on seventy of failure. Damaged Pipes Inlet or outlet piping damaged or broken and in ne Pipe repaired and or replaced. ;epair. Baffles 3affles ing,cracfdng,warpin d/or showing Repair or replace baffles to signs of fai as determined b aintenance/ specifications. inspection pe Vault Structure Cracrcs wider tha -i and any evidence of soii `lault replaced or repaired to Damage-Includes partides errt g the stru through the cracks, design specifications. Cracks in Walls, or main e inspecUon pe nel determines Bottom,Damage to vauit is not structurally sou Frame and/or Top Slab Access er Ladder is corroded or deteriorated,not functioning Ladder replaced or repaired and D property,missing rungs,cracks,and misaligned. eets specifications,and is s to use as detemuned by ins � n personnel. Cracics wider than 1/2-inch at the joint of any inleU No cracks mo than 1/4incn outlet pipe or any evidence of soii particles entenng wide at the joint o e inlev the vault through the walls. outlet pipe. B.) Catch Basin Inserts Maintenance Defect Conditions When Maintenance is Needed Results Expected When Component Maintenance is Pertormed Catch Basin Sediment When sediment forms a cap over the insert media of No sediment cap on the insert ACcumulaUon the insert and/or urnt media and iTs unit. Trash and Debris Trash and debris accumulates on insert unit creating Trash and debris removed from Accumulation a blockage!restriction. insert unit.Runoff freely flows into catch basin. Inspection lnspection of inedia insert is required. Eftluent water�rom meaia insert is free of oils and has no visible sheen. Media lnsert-Water Catch basin insert is saturated with wate�,which no Remove and replace media Saturated longer has the capacity to absorb. insert Media lnsert-Oil Media oil saturated due to petroleum spill that drains Remove and replace media Saturated into catch basin. insert. General Regular interval replacement due to typical average Remove and reolace media at life of inedia insert product. regular intervals,depending cn insert product. 1998 Surface Wa[er Des�gn blanual ?/1l98 :�-21