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Home My WebLink About03180 - Technical Information Report American Engineering Corporation �! `— Engineers • Planners • Surveyors - d '' � � � ` � 1 ��% , � � �� -�- � , �� m � �1 Barone Garden Statuary , Renton, Washington City of Renton TECHNICAL INFORMA TION REPOR T Project Site Location: 4750 Lake Washington Boulevard NE Renton, WA 98056 •�,�ycrr;��t�rCN � F , .. `r Vr� �y �� I JUN 0 q � J�e 2, 2004 �,�.:...,,(�,ti,..,...,, Vir� ��..b.r . Prepared for: Consultin� En�ineev�s Mr. Baro Kim Creative Solutions. . . 14683 SR-20 Mount Vernon, WA 98273 Superior Sev�vice AEC Job #0404 BARONE GARDEN STATUARY � CITY OF RENTON TECHNICAL INFORMA TION REPOR T Project Site Location: 4750 Lake Washington Boulevard NE Renton, WA 98056 June 2, 2004 � "'r►'C.^r . � ,"�7�,� V��4 � � fU �v I Npy � Prepared for: �-��. ' `�•�.:.,. �� - •�t.,y;`.��ti Mr. Baro Kim 14683 SR-20 Mount Vernon, WA 98273 By: � American Engineering Corporation y �E 4032 148'h Avenue NE ��o�wAsy� l+� Redmond, WA 98052 � y� ;� I, 425-881-7430 � 425-881-7731 faac '' � r� ' �33190 1�-r�ti° � �S�ot��.�i..E:'�� . � �o � ��r�es 05-07-��j AEC Job #0404 — Barone Garden Statuary Technical Information Report �' TABLE OF CONTENTS � Section 1: Project Overview ..........................................1-1 : 1-9 Section 2: Conditions and Requirements Summary ............2-1 : 2-2 Section 3: Offsite Analysis.............................................3-1 : 3-8 Section 4: Flow Control and Water Quality......................4-1 : 4-22 Section S: Conveyance System Analysis and Design ............5-1 : 5-2 Section 6: Special Reports and Studies ............................6-1 : 6-1 Section7: Other Permits .............................................7-1 : 7-1 Section 8: ESC Analysis and Design.................................8-1 : 8-2 Section 9: Bond Quantities, Facility Summaries, and Declaration of Covenant ...........................9-1 : 9-1 Section 10: Operations and Maintenance Manual............10-1 : 10-22 �naericatt Engineeri�tg Co�por�atiort, #0404 06i02/04 — _ _ i Barone Garden Statuary I Technical Information Report I TIR Section 1: PROJECT OVERVIEW � , � � American Engirteering Corporation, #fI404 06/02/04 �-� Barone Garden Statuary �', Technical Information Report ' Proiect Overview The proposed project site is located in the southeast quarter of Section 29, Township 24N, Range SE, W.M., in the city of Renton, Washington of King County. The City of Renton has adopted the storm drainage requirements and guidelines contained in the 199�1,'King County Surface Water Design Manual (KCWM). The site occupies 1.25 acres, abutting NE 48th Street on the south, and Lake Washington Boulevard NE to the west,with physical address of 4750 Lake Washington Boulevard NE. The property is zoned CA(Commercial Arterial). There are currently no structures on site. The proposed development will create(1) single pole-type building of approximately 1,870 sf, ' and establish a garden retail business with outdoor sales area. Approximately 11,320 sf of asphalt will be provided, for parking and site access. Two access locations are proposed for the site,with one each off of NE 48th Street and Lake Washington Boulevard NE. On-site soils are Kitsap silt loam,KpC, "Type C„ (till), as indicated by the King County SCS Soil Survey. The majority of the site exhibits slope of less than 20%, with a small area near the north boundary of approximately 2,000 sf approaching slopes of 45%. The site is currently well- vegetated with heavy/thick blackberry and taller grass,with fewer than ten older cottonwood trees located at the northeast corner of the site. The site sheet flows gently towards the west and then southwest, to an existing 12"CMP located at the southwest portion of the site. Stormwater is then routed through a series of piping, swales, and ditches before outfalling to Lake Washington to the west. In addition, there is approximately , 0.44 acres upstream of the site, which gently drains as sheet flow across the site, and is ' considered flow-thru. Detention for the developed site is proposed via live storage in a detention pond, with outflow from the pond regulated by a riser-type control structure. Developed release rates from the pond will be no greater than existing runoff rates for the 2-year, 10-year, and 100-year 24-hour storms, , as predicted utilizing WaterWorks version 4.13 software. i Since the amount of proposed impervious surface subject to vehicular traffic is greater than II 5,000 sf, a biofiltration water quality swale is proposed to treat runoff from parking areas, with a I� design flow equivalent to the 2-year 24-hour developed flo��v rate. I American Engineering Corporation, #l0404 ' 06/02/04 �_� King County Department of Development and Environmental Services TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND PROJECT ENGINEER Part 2 PROJECT L�CATION AND DESCRIPTION Project Owner Project Name Mr. Baro Kim Barone Gardens Address Location 14683 SR-20, Mount Vemon.WA 98273 Township 24N Phone (3601416-0129 Range 5E Project Engineer Chervl Girard, PE ....................Section 29 Company American Enqinee�inp Coraoration Address/Phone (425)881-7430 4032 148"'Ave. NE. Redmond,WA 98052 Part 3 TYPE OF PERMIT APPLICATION Part 4 OTHER REVIEWS AND PERMITS Subdivision DFW HPA Shoreline Management Short Subdivision COE 404 Rockery Grading DOE Dam Safety Structural Vaults Commercial X FEMA—Floodplain Other Other COE WeUands Part 5 SITE COMMUNITY AND DRAINAGE BASIN Community Renton Drainage Basin Gvpsv Creek Part 6 SITE CHARACTERISTICS River Floodplain Wetlands Stream Seeps/Springs Critical Stream Reach High Groundwater Table Depressions/Swales Groundwater Recharge Lake Other Steep Slopes yes ' Figure 1 1 -3 Part 7 SOILS I Soil Type Slopes Erosion Potential Erosive Velocities KpC(Kitsap) less than 40% Moderate Moderate Part 8 DEVELOPMENT LIMITATIONS REFERENCE LIMITATION/SITE CONSTRAINT Ch.4—Downstream Analysis Part 9 ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION Sedimentation Facilities X Stabilize Exposed Surface X Stabilized Construction Entrance X Remove and Restore Temporary ESC Facilities Perimeter Runoff Control X Clean and Remove All Silt and Debris X ' Clearing and Grading Restrictions X Ensure Operation of Permanent Facilities X Cover Practices Flag limits of SAO and open space preservation areas Construction Sequence X Other ' Other I, I �� ' Figure 1 -Z-9" Part 10 SURFACE WATER SYSTEM Method of Analysis � Grass Lined Tank Infiltration Channel X SBUH Vault Depression Pipe System X CompensationlMitigation of Energy Dissapator Fiow Dispersal Eliminated Site Storage Open Channel Wetland Waiver Dry Po�d X Stream Regional Wet Pond Detention Brief Description of System Operation Poullution qeneratinq impervious surface runoff to water Qualitv bioswale. All runoff to detention pond for orifice requlated discharqe. Piped discharqe to downstream drainaqe ditch. Facility Related Site Limitations Reference Facility Limitation Part 11 STRUCTURAL ANALYSIS Part 12 EASEMENTlTRACTS � Cast in Place Vault Drainage Easement X Retaining Wall Access Easement Rockery>4' High Native Growth Protection Easement Structural on Steep Slope Tract Other Other X Sewer Easement,Utilities Easement Pa�t 13 SIGNATURE OF PROFESSIONAL ENGINEER I or a civil engineer under my supervision have visited the site. Actual site conditions as observed were incorporated into this woricsheet and the attachments. To the best of my knowledge the information provided here is accurate. � Z Zoo� Signed/Date ' Figure 1 1-5 � Barone Garden Statuary Technical Information Reaort ;.. . .. 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KA�yN � 25 i a�,a i , � �mC� �1�� 3� � I 2 A€ � �� gg -.: ; ,;r . s.�TE �J `. � Sou Merc ■ Ii i i � PD • � •` ,g• I JrH i-� I � � �� o h• .�A C i i ,�/� .f �• � ' �'I \� • Q� �� !� ' � •�i � I� I , i� � .l,� �I �- Ma e � � . � � , y ��C '� . ��La�eridge Sch ��/� �M 109 �T�� --- —8-�--- ----- — — — 356 � ��i, gt� I� •.; p8p . �� I 1 ��. 1.� � .� / '''/�: 3 i �,� „' rvo ;r . `�KPD' ' �I , , I 'L('+ d ---- � KD8 ' .� � • a • 'AgC p �• 4. South Point ; �, AgD 1 3} •I. .... •. , • '�� ••ASC Kennydale �r °° � �`�� InCt� AkF '� � �;� �� Coleman Poin '�� .' ' P" � Q. „ �. �• —�;\ � Ali F• � , Q��I �InA� •� iR� .. J � �f—� B —D � ..R----- -- �l � gC AgD l/ m a Bn'1'90� • G' l N� �,�� •'\ •l, t m E�� T - �� -:►�_ . .-. � Figure 4: Soils Map :9nierican Engineering Corporcrtiorl, #0404 0�%J';'04 �' l Barone Garden Statuarv Technical Information Report TIR Section 2: CONDITIONS AND REQUIREMENTS SUMMARY (Provided at later date following City of Renton review) Arnericm� Erigi�ieerrng C'or-por•ation, ;t0404 06%'0?%04 Z-Z Barone Garden Statuary Technical Information Report TIR Section 3: OFFSITE ANALYSIS � �- � � � � American Engineering Corporation, #0404 ' 06/02/09 ' 3-2 Barone Garden Statuary Technical Information Renort An offsite analysis was performed by American Engineering on April 19, 2004. Weather was overcast with intermittent showers and a temperature of�55 degrees. Upstream Analysis Minor amounts of runoff upstream of the site contribute to the site, as shown on the existing and developed hydrology maps located in TIR Section 4. Offsite flow will be collected, conveyed to the I onsite stormwater facility, and treated for water quality and quantity. Observed stream reaches upstream j of the proposed project show no existing or potential problems (flooding, scouring, sedimentation, II erosion, etc...) �, Downstream Analvsis Please refer to the downstream analysis map located in this section �vhen referring to the following analysi s. From the southwest corner of the site ("A"), flo�vs are conveyed via the following flo�v segtnents: � A to B (0'to 1 SO'): Flows are conveyed to the south through a system of 12"minimum diameter piping, underneath NE 48`h Street, discharging to a roadside ditch/swale located at the SW intersection of Lake Washmgton Boulevard NE and NE 48th Street. B to C(1 SO'to 400'): Flows travel southerly through a ditch/swale that is located along the east shoulder of Lake Washington Boulevard NE. The swale sides are well-armored with gabion, and well-vegetated with cattails and young hardwoods. C to D (400'to 6S0'): I, 24"diameter piping to the west, underneath Lake Washington Boulevard NE and I-405, discharging to � Gypsy Creek. ' D to E(650'to 850'): Comprised of a ditch/swale flowing to the north�vest that is well-stabilized,�4 feet wide, and SH:1 V side slopes with grass. Note that at point"D", there is the 24"diameter outfall mentioned above. There , is also a 36" diameter cast iron outfall,which is badly deteriorating/rusting, and is separate from this i downstream analysis. American Engineering Corporation, #0404 06/02/04 3-z Barone Garden Statuary Technical Information Renort E to F(850'to 1,030'): Comprised of 24"diameter piping heading to the west, underneath Ripley Lane and a railroad R/W. Note that there are (2) 48"type 2 catch basins along this run,both of which contain"jailhouse"type inlets, and either a"birdcage"or grate type overflow structure, indicating potential surcharging during periods of higher flow rates. Fto G(1,030'to 1,230'): Comprised of a ditch flowing to the northwest that is well-stabilized,�5 feet wide, and 2H:1 V side slopes with young hardwoods and occasional grasses. G to H(1,230'to 1,830'): Due to presence of private property that was fenced with chain-link,the full length of this conveyance was not field-verified. However,this reach begins as a 24"diameter aluminum pipe, and heads underground to the west. Flows are conveyed to the west for�600 feet, before reaching Lake Washington. Drainage complaints were reviewed within the downstream analysis area. Per conversation with City of �i, Renton on March 10, 2004 there is a flooding problem within the downstream area, documented as i problem site#PS-61 (see documentation at end of this section). However, the proposed project should II not negatively impact PS#61, as described below. I The downstream flowpath described above is well-stabilized. Since this project proposes to release �', developed surface flows at less than but no g��u�,;r than the existing surface flow rates, no adverse effect ' to downstream facilities is anticipated as a result of this project, and a severe flooding problem should not be created ar aggravated. Furthermore, a 30% volumetric safety factor has been applied to the ', proposed detention pond design volume. American Engineeri�tg Corporation, #0904 06/02/04 3-3 Barone Garden Statuary Technical Information Report �'�:� King County ArcIMS HTML Viewer Ma ,�; _ •. - �,. � _ ' :?fi a, _ . � v ;� � 'sa0000 >.� , p, ��. �; �;� � ,. r. _ r Yy ,Q1 ; � '_[,IGry_•' �.f�•. .. . ._ . _ �`.I 1, Q, i�i �1,. L'G1_'"'_"_ `.~ l;- ��" �.P• ' . Ilfp` � }• -. _ a �f�� Leke Weshi ton : , - .<:.: .- a ' �� `:�..: :� �- °- .: ' �'�°� �`:� _,! r f ," � �fm�.' � •�Y ..« ' t: .•ir _ �1,�2r. . . "�'. u � N� u}t � �4�2�0 � 11 ,r�. ' s - � • :f �, 2: ;as .-� � ' r ... � ',�� ..� .•r�_ � �P, .. �rl �. _c � s ^,`"i h .i3' ' 1 ( . aP�..-.. v � � I;Cd= �'+� �y. � -,x � � �� : M a . 'r^9� _. . • 4� -.�„' . 'ti '�!c ; :'�'4 ,� .� � .' . � NE l8T_H 37- i"`2� ,? �.• b, �t w�I '- ;�+., � �° � 'if t {, �: �, _. >�, '� y,�� ; �_ .. :- ^.r.,,,,�...._ - '� �� s = _ :f �; � v' i ,,� , i Y h �-S F �,�_.� `2924QSOOGt _`�4..�,. �s�p �'� •'(� •�' ��i . ' ; `� � �j d :�� 6 331�••_� ._..� ��.r+ - 4�_�r"L�� -. � �� ' � �e R � � �� {� � �v � � . � �, , �, I ? ` ' _- f:�'`� ''.. � ,s _ j ' ��a�� , - �,•� �`, ' �,,, ,� �_ �'�.,� - ,- �. ��4',-- f: R a �D' � � ,� �: _ -� �, i:�_ .: .. . � '* `,. .�, s _ _ 4�� a�'�..�` ; ��q.�o� +' °'� ` I ;� ��'� � ^�"^,�, y� � '� { '�} "' `s' . i �y'�' x .� �.r �tq�. { � . : +'�, � "~ -� -� ,��, f� +�le ,�311J3pg1� • � . . • t 1'i {CJ 2069 King County f -^'r� . � .� .-.•�-�> �-i0 Q.�$$fTllj . / /'N �� , 0 Zo0 Ab� � . 1 ,�ow^/SrRE,qM ,�N��Y53'S MAp - American Engi�aeering Corporation, #0404 06/02/04 3-9� .,. . .. . ..�,,..,. ��.� -,.�v �c.�i r .eil Pa985� 7671 �a a Post-�tr Fax Note From �`,L�,l��..r.�.- So"� Co. � � � � , GOJ e4t. PhO�e� �� v Pnona 3 Faz� � PLANNtNG/BUILDIN F��- ' � � , �_��--" .. . _ �_�____ ' _� !�■ ` �� V � l� � � � � I DATE: M�cH 21,2001 TO: GIZEGG Z►MMERMAN . FRED KA[JFr�tAN FROM: rr�,w arrs �� SUBJ'ECT: CURI�EM'POLICY�'OR ADriITIONAL bRATNAGE CONTROT COiV'DT7ION5 in reviewing developulent projerts, staff has asked for upgraded drainage requiren�ents on � projects that aze located in areas with pot�ntial downstream flaoding or erosion problems. , � Ihis has occasionally resulted in differezr conditions for di.fferent projects in the same neighborhood. This memo is an at�empt to explain the history of these additional drainage requirements, and pro�-ide guida.nce on how we wiil. address drainage concerns for new pro}ects. The City oE Renton has adopted the 1;'9 Kzng Count�� Surface �vater Manual (1991 KCSWM} for drainage reguirements for 7e«� developments. Hox•e�Ter, for projects with potenrial downstream flooding or erosicr+ problenls, additional drainage requirements through SEPA or platting conditions may t� warranted. Early areas of concem were the Mapl�wood Greek basin (projects such �G Safe�vay and QFC� and the 7'alhot Rd S. area (projects such as Campen Springs, Spri..�bbrook Condominiums and :4shbraok). These projects were required to comply to increased standards forflooding (der�ntion for the 100 year storm event) or erosion control (release rate set at half the pre-existing 2 year storm re.lease rate). These increased standards �,�ere applied using the design standards outlined in the 1991 KCS�rM, since th�1998 KCSr'��'I either did not exist, or was noe yet adopted by the County. Then the 1998 KC5��4'I�T cazn� into e:istea:ce and adoption b�� the Couz�ty. T�-us �anual has increased requirements for Qetenuoi:, ar:� requires increased standards _`or certain critical drainage basins. Projects in the aruYexa:c:� area east of the City �yould be subject to this ne�v manual if �.e��eloped un�er Co��ty ;:�zrmits prior to a:-ulexa�on T�-�ese projects have potential downstrearn flooding -.�a zrc�,�.c� proUlems, so additionzl mi�oation conditions r` b�vond the code mandated 1991 K�;�''v�:;T are ��pr�priate. To ad�ress this drainage , mitigation, and tc�ren�ain cai,�is`en`.`�!`lUl_�Te-annexation leve? of drainage requirements, it � ha5 beeri ouT polic�� to T�quest S?;P:�. or pla�ig conditions for drainage plans ir� compliance ��.th the nz�•,1993 KCSW?�� To= a11 proJects in: 3-S �� J� � „u� l� _ � � �S � A I;'.',� ` I,..ftl III�I ��:;�� :��Ikl! ,IrM r.�niq�� n�� J ; i ,lb -�� 11. 'r..,,�aL...._. 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TCTAL r.a� _ i Barone Garden Statua I' rY Technical Information Report TIR Section 4: ', FLOW CONTROL AND WATER QUALITY � Antericn�i F_�igineeri»g C'nrporation, itU4U� 06/02/04 4-Z Barone Garden Statuary Technical Information Report Existin� Site Hydrology (Part A) I Existin�Hydrolo�2y The following assumptions and site parameters were used in analyzing the existing site hydrology: Total Basin A =1.69 AC(1.25 AC on-site+ 0.44 AC upstream) Impervious None Pervious Grass and/or landscape On-site: 15,300 sf, CN= 86 � I Upstream east: 4,275 sf, CN= 86 �, Brush �� ' = �� On-site: 39,281 sf, CN= 81 Upstream north: 14,630 sf, CN= 81 73,486 sf= 1.69 AC, CN=82.33 Tc= 13.51 min ' Table 1. Existing Site Land Cover Types I, Basin Area Impervious Pervious CN Tc (min) A 1.69 AC 0 AC 1.69 AC 82.33 13.51 American�ngineering Cofporation, #U4/�' 06/02/04 �"-L �, \ , � •3 �\� �� , �� , '� �� , � . 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I., 1\ . 7.—�_�__,_! / � V --- I ae� _. 1' __ i / � � ., 1 I; �i _ ' �n.or � -._ ! ,� _ / — __ __ __ - ------------ - -- -------------- � ��o-��----I- � - � Hoose•�e'[ i � � - - -- � I� «<�: \�\'o � ��o � j j , �\ ::iz' �x....... .:.�.�� u � ��a 'p / ««� ��`l'I'�.' � r o , . � �_ � ��,�p. � u� � ��n� �,�� -� m'�`�' «� $o ±N w � �� . o ^Q � � .. n �a4��v� �u$ Z N�� ',� � I ' � � � ur�i � � —�� Q' � ' $� � �� i� 00 � I I y �� m � c �y � s ci�0 o I � I z �� I I I � �' �"�C.�57��/G S�7'F �Y�Rol. OG Y � �{ BARONE GARDEN STATUARY o��. No R�ddon� oa�. a � ,�,awrsr oe-oz-oa _ — p �••ot�i�ay�`,��"d` Amarlcan Enqin�va • Plonn�n • Surv�rora Scd� o EXISTING SITE CONDITION5 �;� ��a�� AS SHOWN Engineering 1072 IIBI�Aw.NE. � � � � o CO�pO�YtIO�I ^R�amon',WA 96052 � � Mo�n CWA tli� ~iK O �'. iL' ��..--.w�.'_"'� Y ,. ;f ".14�.. W � �r. 1�1 i T O��Qf1�A '�s�'f°��1"•t�s� PHp1E I125)BBI-7�30 vo■(�xs)oai-nai Tn . �Ne��No cn•a.a [IWWCS:1.lT]0. fY�potll t Nom� TH � P�\7�10��0�0��Cnyrr�rhp\D.p\rO�G�fpl.tl.p OS/28/200� OJ�22�16 VN PDT Barone Garden Statuary , Technical Information Report � Developed Site Hydrology (Part B) Developed HydroloQv The following assumptions and site parameters were used in analyzing the proposed site hydrology for sub-basin C: Total Rasi�t A = 1.69 AC(1.25 AC on-site+ 0.44 AC upstream) Imperviorrs Roof/sidewalk/asphalt parking: 13,042 sf, CN=98 Detention pond: 1,420 sf, CN= 100 14,462 sf=0.33 AC, CN=98.19 Tc = S.Omin Pervious Gravel: 2,060 sf, CN=89 Brush Utilities Easement east: 2,565 sf, CN =81 Steep Area: 2,050 sf, CN =81 Upstream north: 14,630 sf, CN= 81 Landscaping/grass (73,486— 14,462—2,060, - 19,245)= 37,719 sf, CN=86 59,024 sf= 1.36 AC, CN=84.47 Tc= 5.0 min I Table 2. Developed Site Land Cover Types Basin Area pervious Pervious CN Tc(min) A 1.69 AC 033 AC 1.36 AC 98.19/84.47 5.0 American Engineering Corporation, #0404 06/02/04 ¢ �^ / SEC. 29,TWP.24 N., RPG. 5 E.,W.M. / � i ��,_ b.�. / i . 'NV� Jl.J�(e'N) '� �v� xx(s'sEl � i o' I ,�� ,,, , �. 2 s�c � o.��c = ;�. 69 �1c TorA� / � � ��, � -/ / I fi /. 36 AC PFie vso i b - --� � �� S, Cit/ = 8'�, 47 a � ��_.��. � 0.33 A� � // / _- --� �hv-mee�e•H�' ��I�� I � / , �nv_zees e•sc ` ' � _-/ ` � ..,/- � f� /. 6 9�C ; � f�/.-- `! ; � / �_ � �: Q44�c I�P�T�t�4N ; � o = �»„ b cr M> wv�n(� s) � wv x.:z c �:a-- � � . - _ -. 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I . �. -�. ` •.�: � � �... ... -�-� : ,.. � � . .�. ` � `/ / WV�2LL97(IYWPNE) _/ i/� . ��•f��S4W�PoY�X10 •// � �� ••�// •f //` •`a�/'/��//�� /�`/;\ //�//, �// �� l ` • � ye � � �` "�L.. � i aoii� r / NSTILL C01OR OO/OEfE�EMNICS t ARRONGM KT.2 �,j�"�� . 6 � wv-179 0.ROM , ` I . I r w-�12 � �' / �� '- �_ �v na�+oe�s'oeaas e�uwae a-w��•our • / rnt cew.v.tw-mM(rn-z�auzwa) � f s.' ! wv_.sas� �J . — �_ ~'—PfR GOR SD.BR1O , . ' / �� wV Sa6�� '1�-1 O � _ _ � _ � ' _ . � � � �� L / W W E.-� � �� 1 ,1 1 � I ' T � ' � I � ' I �ce ra� sz�i i � � � : i F--1 / ��- �.» i � � N.E 48Th1 STREET , t �- 1 f�-+ ` �. `�r.v-ri @-aw wI; i ! ' I ' '� n�u3s y�Pusnc� ' � NV�S�2(6��P q I ; �j � � A � . ` � � � � � � ; �� l ( � " O � pq ,v1 _/11L 1/1/ LU LL�C�/LL L1/�:1/L_ L1L!_Y1/1 t_/L!L 1%1/�11r_L�,(1—/L'L � 17�Tz':Lll1_f1/1��r,dL/�1/1 r►� W O / �1i . .. ., ., t . — . ' - -� - - - - �— , -- ` il ' , v 'J U /�� - -�"_ ' — t-- - - - - - -� �--1' ^ W W _ � // �1 � M— — — -- —� cs w-.a� — --� — _� �}1 .ce rau.nn _ — /� / {lr� �-- � $SIMI PoY�]�.96 WY�11.7J(6�PLASTG N) .� LaV�66.9(tY Cl+P� z Y�1 / nv.x�s a Ftow u.v-azxo(tY ar vh / � J I 12'OA ��v.a2.2J(t2'WP E) � *v�60.3 I6'CYP E) "r� / CB fLY�220a SU�p1 PoM�2Qe2 NV�6110(tI'Gv� O WV-19.8](tY CMP E) /INV�2}9(12�PI�W) � INV.{].JJ(b�CAP N) � WV a 66.50(b�CPP M) �/ � I.YV�1��(x'yc s� wv_a�.�(a'wv e) I F.e.i �Mr'' I� CALL 48 HOURS ��0404 BEFORE YOU DIG 1-800-424-5555 91Ef �._ S' Barone Garden Statuar Y Technical Iaformation Report Performance Standards (Part C) I�i I The City of Renton has adopted the 1991 KCSWM for drainage requirements. However, since this proposed development is the Gypsy Creek Basin, increased detention standards are required. , The increased standard for flooding requires the detention system to be designed such that the post-development peak runoff rates from a 2-year 24-hour, 10-year 24-hour and 100-year 24- hour storm do not exceed the existing peak runoff rate from the 2-year 24-hour, 10-year 24-hour and 100-year 24-hour storms respectively. In addition, a volumetric safety factory must be applied to the detention facility: the volume of storage required for detention shall be increased by 30%without increasing storage depth. WaterWorks version 4.13 soflware has been utilized to model basins and determine detention and water quality volumes. T'he SBUH method of analysis with a Type 1-A rainfall type was used. Design storm quantities to be used in the analysis are site specific and dictated from isopluvial maps located in section 3 of the KCSWM. The rainfall amounts for the 2, 10, and 100-year 24-hour storms are 2.0,2.9, and 3.9 inches respectively. Since the amount of impervious surface subject to vehicular traf6c is greater than 5,000 sf, a ', biofiltration water quality swale is proposed, with a design flow equivalent to the 2-year 24-hour 'I flow rate. ', The on-site conveyance system must have sufficient capacity to convey and contain the 25-year peak flow with at least 0.5 ft of freeboard. The conveyance system should have the capacity to convey and contain the 100-year 24-hour peak flow without overflowing. American Engineering Corporation, #0404 06/02/04 �--6 - Barone Garden Statuary Technical Information Report Flow Control System (Part D) Flow control will be achieved by using the live storage volume in a detention pond,with outflow from the pond regulated via a riser-type control structure, located in a 54" diameter type 2 catch basin just southwest of the pond . The details of the basin summaries, level pool routing, and stage-discharge and stage-storage are found on the following pages. A summary of the results for the WaterWorks program is listed below. Table 3. Existing and Uncontrolled Developed Peak Flow Rates Basin Pre-Develo ed CFS Uncontrolled/Post-Develo ed CFS 2yr/24hr l0yr/24hr 100yr/24hr 2yr/24hr l0yr/24hr 100yr/24hr A 0.17 0.41 0.72 0.34 0.64 0.99 Table 4. E�isting and Controlled Developed Peak Flow Rates Basin Pre-Develo ed CFS Controlled/Post-Develo ed CFS 2 /24hr 10 /24hr 100yr/24hr 2yr/24hr l0yr/24hr 100yr/24hr A 0.17 0.41 0.72 0.17 0.25 0.72 Required Live Storage 22.00' to 23.49'= 1,990 cf(w/o F.O.S.)x 1.39=2,590 cf(w/F.O.S.) Provided Live Storage 22.00 to 23.49' =2,800 cf>2,590 cf req'd Control Structure(2, 10, & 100 year control): 12 "riser w/notch weir Orifice : 2.99"diam., elev. =20.00 ft Notch: 0.22' H x 1.3' L, elev. =23.27 ft Overflow Elev. =23.49 ft Outlet Elev. =22.00(12" CPEP) OverJlow Spillway: Jailhouse Q=C(L-0.2H)H3n C=3.27+0.4(H/P)=3.27+0.4(0.5/1.49)=3.40 TryL=2.Oft: Q=3.40(2-0.2(0.5))0.53� Q=2.28 cfs>0.99 cfs req'd capacity,therefore use 2.0 ft. L x 0.5 ft H jailhouse. American Engineering Corporation, #0909 06/02/04 -! -7 Barone Garden Statuary Technical Information Report Water Quality System (Part E) Water Quality Faciliry Analysis A biofiltration swale is proposed to treat runoff from asphalt parking areas. The biofiltration swale will be located upstream of the proposed detention pond, and has been sized to treat the developed 2-year 24-hour flow from 0.26 acres of proposed asphalt parking. Due to site-specific available area constraints,the length of the biofiltration swale is proposed to be 50 feet, while maintaining the surface area of the design water surface at the biofiltration design flow equivalent to that based on a 200 foot length. Design criteria per section 4.6.4 of the 1990 KCSWM were used, as documented on the following page. r ' I� American Engineering Corporation, #0904 06/02/04 �-8 BARONE GARDEN STATUARY WATER QUALITY B/OFILTRATION SWALE May 3, 2004 AEC #0404 DESIGN WIDTH(c�200'L DES/GN VELOCITY Slope(ft/ft) 0.02 Area= 0.57 Slope(ft/ft) 0.06 Area= 3.33 n 0.35 P= 2.81 n 0.35 P= 11.11 Target Q(cfs) 0.11 R= 0.20 Target Q(cfs) 0.11 R= 0.30 b(bottom width,ft) 0.7 Q= 0.12 b(bottom width,ft) 9 Q= 1.56 Side slope 3 SA= 539.60 Side slope 3 flow depth(ft) 0.333 flow depth (ft) 0.333 V= 0.47 �1.5 fps OK CONVEYANCE CAPACITY(25-year) Slope(ftJft) 0.06 Area= 0.55 n 0.027 P= 9.38 DESlGN W/DTH(�50'L Target Q(cfs) 0.84 R= 0.06 Slope(ft/ft) 0.02 Area= 3.33 b(bottom width,ft) 9 Q = 1.13 n 0.35 P= 11.11 Side slope 3 Target Q(cfs) 0.11 R= 0.30 flow depth (ft) 0.06 V= 2.05 <5.0 fps OK b(bottom width,ft) 9 Q= 0.90 Side slope 3 SA= 549.90 CONVEYANCE CAPACITY(100-year) flow depth(ft) 0.333 550 sf>540 sf, OK Slope(ft/ft) 0.06 Area= 0.55 n 0.027 P= 9.38 Target Q(cfs) 0.98 R= 0.06 0.33'+0.5'min. freeboard=0.83'tota/depth b(bottom width,ft) 9 Q= 1.13 Side slope 3 flow depth(ft) 0.06 V= 2.05 <5.0 fps OK '� � �D 04046ioswale,xls 6/3/2004 7:53 AM , C:\waterW1040415-26-04.doc OS/26/04 11:09 AM 1!9 5/26/04 11:3 :44 am American Engineering Inc page 1 BARONE GARDENS AEC #0404 MAY 26, 2004 --------------------------------------------------------------------- --------------------------------------------------------------------- BASIN SUMMARY BASIN ID: DEV10 NAME: DEVELOPED 10-YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1.69 Acres BASEFLOWS: 0. 00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 2.90 inches AREA. . : 1.36 Acres 0.33 Acres TIME INTERVAL. . . . : 10.00 min CN. . . . : 84.79 98.18 TC. . . . : 5 .00 min 5.00 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 80.00 ns:0.0600 p2yr: 2.00 s:0.0750 TcReach - Shallow L: 30.00 ks :11.00 s:0.3300 TcReach - Channel L: 45.00 kc:42.00 s :0.0670 TcReach - Channel L: 105.00 kc:42.00 s:0.1500 PEAK RATE: 0.64 cfs VOL: 0.24 Ac-ft TIME: 480 min BASIN ID: DEV100 NAME: DE�7ELOPED 100-YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1.69 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 3 .90 inches AREA. . : 1.36 Acres 0.33 Acres TIME INTERVAL. . . . : 10.00 min CN. . . . : 84.79 98.18 TC. . . . : 5.00 min 5. 00 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 80.00 ns:0.0600 p2yr: 2. 00 s:0.0750 TcReach - Shallow L: 30.00 ks :11.00 s:0.3300 TcReach - Channel L: 45.00 kc:42.00 s:0.0670 TcReach - Channel L: 105.00 kc:42.00 s:0.1500 PEAK RATE: 0.99 cfs VOL: 0.37 Ac-ft TIME: 480 min BASIN ID: DEV2 NAME: DEVELOPED 2-YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1.69 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 2.00 inches AREA. . : 1.36 Acres 0.33 Acres TIME INTERVAL. . . . : 10.00 min CN. . . . : 84 .79 98.18 TC. . . . : 5.00 min 5.0� min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 80.00 ns:0.0600 p2yr: 2 .00 s:0.0750 TcReach - Shallow L: 30.00 ks:11.00 s:0.3300 TcReach - Channel L: 45.00 kc:42.00 s:0.0670 TcReach - Channel L: 105.00 kc:42.00 s:0.1500 PEAK RATE: 0.34 cfs VOL: 0.14 Ac-ft TIME: 480 min I � �I'-lD ('`,.�n,.,�t,p'11-1�,1'�-�(i-(l� �ln:, (15'�Fi'r11 1 1��n :1\T ^ 5%26/04 11 :3 :44 am American Engineering Inc page 2 I BARONE GARDENS AEC #0404 MAY 26, 2004 BASIN SUMMARY BASIN ID: DEV2WQ NAME: DEVELOPED 2-YEAR WATER QUALI" SBUH METHODOLOGY TOTAL AREA. . . . . . . : 0.26 Acres BASEFLOWS: 0.00 cfs �� RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 2.00 inches AREA. . : 0.00 Acres 0.26 Acres TIME INTERVAL. . . . : 10.00 min CN. . . . : 0.00 98 .00 TC. . . . . 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 80.00 ns :0.06�0 p2yr: 2.00 s:0.0750 TcReach - Sheet L: 100.00 ns:0.1500 p2yr: 2 .00 s:0.1960 � TcReach - Shallow L: 135.00 ks:27.00 s:0.0274 TcReach - Channe��,: 40.00 kc:42.00 s:0.3�00 PEAK RATE: O.I1 �fs VOL: 0.04 Ac-ft TIME: 480 min - / BASIN ID: EX10 NAME: EXISTING 10-YEAR SBUH METHODOLOGY � TOTAL AREA. . . . . . . : 1.69 Acres BASEFLOWS: 0.00 cfs \ RAINFALL TYPE. . . . : TYPElA PERV IMP � PRECIPITATION. . . . : 2 .90 inches AREA. . : 1.69 Acres 0.00 Acres TIME INTERVAL. . . . : 10.00 min CN. . . . : 82 .33 �.00 TC. . . . : 13.51 min 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 80.00 ns :0.1500 p2yr: 2.0� s:0.0750 __, " TcReach - Sheet L: 140.00 ns:0.1500 p2yr: 2.00 s:0.2000 TcReach - Shallow L: 140.00 ks:9.00 s:0.0765 PEAK RATE: 0.41 cfs VOL: 0.19 Ac-ft TIME: 480 min BASIN ID: EX100 NAME: EXISTING 100-YEAR SBUfi METHODOLOGY i . TOTAL AREA. . . . . . . : 1.69 Acres BASEFLOWS: 0.00 cfs . , RAINFALL TYPE. . . . : TYPElA PERV IMP I PRECIPITATION. . . . : 3.90 inches AREA. . : 1.69 Acres 0.00 Acres � TIME INTERVAL. . . . : 10.00 min CN. . . . : 82.33 0.00 TC. . . . : 13 .51 min 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: B0.00 ns:0.1500 p2yr: 2.00 s:0.0750 TcReach - Sheet L: 140.00 ns:0.1500 p2yr: 2.00 s:0.2000 --_�" TcReach - Shallow L: 140.00 ks :9.00 s:0.0765 PEAK RATE: 0.72 cfs VOL: 0.30 Ac-ft TIME: 480 min t � c ��// C:lwaterW1�40415-26-04.doc 05/26/04 11:09 AM 3/9 5/26/04 11:3 :44 am American Engineering Inc page 3 BARONE GARDENS AEC #0404 MAY 26, 2004 --------------------------------------------------------------------- --------------------------------------------------------------------- BASIN SUMMARY BASIN ID: EX2 NAME: EXISTING 2-YEAR SBUH METHODOLOGY TOTAL AREA. . . . . . . : 1.69 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE. . . . : TYPElA PERV IMP PRECIPITATION. . . . : 2 .00 inches AREA. . : 1.69 Acres 0.00 Acres TIME INTERVAL. . . . : 10.00 min CN. . . . : 82.33 0.00 TC. . . . : 13 .51 min 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 80.00 ns:0 .1500 p2yr: 2.00 s:0.0750 TcReach - Sheet L: 140.00 ns:0 .1500 p2yr: 2.00 s:0 .2000 TcReach - Shallow L: 140.00 ks:9.00 s:0.0765 PEAK RATE: 0. 17 cfs VOL: 0 .09 Ac-ft TIME: 480 min l I� � � i �'�Z C:lwaterW10404\5-26-04.doc OS/26/04 12:01 Y 5�26�04 11:3:44 am American Er--; �- - __ �� T�� __ BT_pnr1E ^-�n^F, AEC #4404 MAY 26, 200-- HiDRu:�k1=PIi SUI�tI'�l[�?Y PEAK TIME VOLUME HYD RUNOFF OF OF Contrib NUM RATE PEAK HYDRO Area cfs min. cf\AcFt Acres --------------------------------------------- --------------------------------------------- 1 0.168 480 4072 cf 1.69 :SX2 2 0.408 480 8111 cf 1.69 :SX10 3 0.716 480 13156 cf 1.69 :SXI00 4 0.342 480 6020 cf 1.69 :DSV2 5 0.639 480 10575 cf 1.69 :DBV10 6 �.994 480 16020 cf 1.69 :DSV100 7 0.168 510 6020 cf 1.69 :2YRCONTROLLSD 8 0.254 56� 10575 cf 1.69 :IOYRCONTROLLSD 9 0.716 500 16020 cf 1.69 :100YRCONTROLLED 10 0 .105 480 1675 cf 0.26 :DEV2WQ � - ' ��.�� ', ��(�� ;� u � .. 4-/3 C:\„�aterW\0404�5-26-04.doc OS/26/04 11:09 AM 5/9 I 5/26/04 11:3:44 am American Engineering Inc page 5 BARONE GARDENS AEC #0404 MAY 26, 2004 --------------------------------------------------------------------- --------------------------------------------------------------------- STAGE STORAGE TABLE TRAPEZOIDAL BASIN ID No. POND2 Description: POND W/O S.F. Length: 50.00 ft. Width: 20.00 ft. Side Slope 1: 3 Side Slope 3 : 3 Side Slope 2: 3 Side 51ope 4: 3 Infiltration Rate: 0.00 min/inch STAGE <---STORAGE----> STAGE <---STORAGE---> STAGE <---STORAGE---> STAGE <---STORAGE---> (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft> ---cf--- --Ac-Ft- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- 100.00 0.0000 0.0000 101.10 1370 0.0315 102.20 3344 0.0768 103.30 6018 0.1382 1Q0.10 102.11 0.0023 101.20 1523 0.0350 102.30 3557 0.0817 103.40 6299 0.1446 100.20 208.50 0.0048 101.30 1661 0.0386 102.40 3775 0.0867 103.50 6587 0.1512 100.30 319.22 0.0073 101.40 1845 0.0423 102.50 4000 0.0918 103.60 6881 0.1580 100.40 434.37 0.0100 101.50 2013 0.0462 102.60 4231 Q.0971 103.70 7183 0.1649 100.50 554.00 0.0127 101.60 2187 0.0502 102.70 4467 0.1026 103.80 7491 0.1720 100.60 678.19 0.0156 101.70 2366 0.0543 102.80 4710 0.1081 103.90 7806 0.1792 100.70 807.02 0.0185 101.80 2550 0.0585 102.90 4959 0.1138 104.00 8128 0.1866 100.80 940.54 0.0216 101.90 2740 0.0629 103.00 5214 0.1197 104.00 8126 0.1866 ' 100.90 1079 0.0248 102.00 2936 0.0674 103.10 5476 0.1257 101.00 1222 0.0281 102.10 3137 0.0720 103.20 5744 0.1319 � 4-i 4 C:\waterW\040415-26-04.doc OS/26/04 11:09 AM 6/9 5/26/04 11 :3:44 am American Engineering Inc page 6 BARONE GARDENS AEC #0404 MAY 26, 2004 --------------------------------------------------------------------- --------------------------------------------------------------------- STAGE DISCHARGE TABLE MULTIPLE ORIFICE ID No. FROP Description: RISER W/ ORIFICES Outlet Elev: 100.00 Elev: 100 .00 ft Orifice Diameter: 2 . 9941 in. STAGE <--DISCHARGE--> STAGE <-DISCHARGE---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> (ft) ---cfs-- ------- (ft) ---cfs-- ------- (ft) ---cfs-- ------- Sft) ---cfs-- ------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- 100.00 0.0000 101.10 0.2552 102.20 0.3606 103.30 0.4419 100.10 0.0769 101.20 0.266� 102.30 0.3690 103.40 0.4486 100.20 0.1088 101.30 0.2774 102.40 0.3769 103.50 0.4551 100.30 0.1332 101.40 0.2879- 102.50 0.3847 103.60 0.4616 100.40 0.1539 101.50 0.2960 102.60 0.3923 103.70 0.4680 1U0.50 0.1720 101.6b 0.3077 102.70 0.3997 103.80 0.4742 100.60 0.1884 101.70 0.3172 102.80 0.4071 103.90 0.4804 100.70 0.2035 101.80 0.3264 102.90 0.4143 104.00 0.4866 100.80 0.2176 101.90 0.3353 103.00 0.4214 100.90 0.2308 102.00 0.3440 103.10 0.4283 101.00 0.2433 102.10 0.3525 103.2C 0.4352 I 4-IS C:\waterW1040415-26-04.doc OS/26/04 11:09 AM 7/9 I� 5/26/04 11:3 :44 am American Engineering Inc page 7 ' BARONE GARDENS AEC #0404 MAY 26, 2004 --------------------------------------------------------------------- --------------------------------------------------------------------- STAGE DISCHARGE TABLE COMBINATION DISCHARGE ID No. combo ', Description: riser w/ orifice and notch ' Structure: FROP Structure: Structure: notch Structure: I Structure: STAGE <--DISCHRRGE---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> (ft) ---cfs-- ------- (ft) ---cfs-- ------- (ft) ---cfs-- ------- {ft) ---cfs-- ------- ----------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- 100.00 0.0000 101.60 1.0830 103.20 9.0795 104.80 15.270 100.10 0.0769 101.70 1.4562 103.30 9.5971 104.90 15.441 100.20 0.1088 101.80 1.8654 103.40 10.105 105.00 15.579 100.30 0.1332 101.90 2.3043 103.50 10.600 105.10 15.682 100.40 0.1539 102.00 2.7677 103.60 11.083 105.20 15.748 100.50 0.1720 102.10 3.2514 103.70 11.550 105.30 15.776 100.60 ��884 102.20 3.7518 103.80 12.000 105.40 15.765 100.70 0.2035 102.30 4.2656 103.90 12.433 105.50 15.714 100.80 0.2176 102.40 4.7899 104.00 12.846 105.60 15.620 100.90 0.2308 102.50 5.3221 104.10 13.238 105.70 15.484 I 101.00 0.2433 102.60 5.6597 104.20 13.607 105.80 15.302 i 101.10 0.2552_ 102.70 6.4004 104.30 13.953 105.90 15.075 I 101.20 0.2665 _ 102.80 6.9422 104.40 14.273 106.00 14.801 ', 101.30 0.2994- 102.90 7.9829 104.50 14.566 'i 101.40 0.4642 103.00 8.0206 104.60 14.830 �� 101.50 0.7545 103.10 8.5534 104.70 15.066 , 4-/6 C:lwaterV1�0404\5-26-04.doc 05/26/04 11:09 AM 8/9 5/26/04 11:3 :44 am American Engineering Inc page 8 BARONE GARDENS AEC #0404 MAY 26, 2004 --------------------------------------------------------------------- --------------------------------------------------------------------- STAGE DISCHARGE TABLE NOTCH WEIR ID No. notch Description: notch in 12" riser Weir Length: 1.3000 ft. Weir height (p) : 3 .0000 ft. Elevation : 101.27 ft. Weir Increm: 0.10 STAGE <--DISCHARGE---> STAGE <--DISCHARGfi---> STAGE <--DISCHARGE---> STAGE <--DISCHARGE---> (ft) ---cfs-- ------- (ft) ---cfs-- ------ (ft) ---cfs-- ------- (ft) ---cfs-- ------- 101.27 0.0000 102.00 2.4237 102.80 6.5351 103.60 10.621 101.30 0.0220 102.10 2.8989 102.90 7.0686 103.70 11.082 101.40 0.1963 102.20 3.3910 103.00 7.5992 103.80 11.526 101.50 0.4566 102.30 3.8966 103.10 8.1250 103.90 11.953 101.60 0.7752 102.40 4.4130 103.20 8.6443 104.00 12.359 101.70 1.1390 102.50 4.9374 103.30 9.1552 101.80 1.5390 102.60 5.4674 103.40 9.6560 101.90 1.9690 102.70 6.0007 103.50 10.145 { �/� C:\�i aterVV\040415-26-04.doc 05/26!04 11:09 AM 9.-9 5/26/04 11 :3 :45 am American Engineering Inc page 9 BP�20NE GrRDENS AEC #0404 MAY 26, 2004 --------------------------------------------------------------------- --------------------------------------------------------------------- LEVEL POOL TABLE SUMMARY MATCH INFLOW -STO- -DIS- <-PEAK-> OUTFLOW STORAGE <----—--DESCRIPTION—-------> (cfs) (cfs) --id- --id- <-STAGE> id (cfs) VOL (cf) ------------------------------------------------------------------------------------- ------------------------------------------—------—------------------------------- 2 YR W/ 2 YR .. . . . . . .. . . . .. .. . 0.17 0.34 POND2 combo 100.48 7 0.19 527.29 cf 1� YR W/ 10 YR . . .. . .. . .. .. .. . 0.41 0.64 POND2 Combo 101.09 S 0.25 1350.85 cf 100 YR W/ 100 YR .. . . . . ... . . .. Q.72 0.99 POND2 Combo 10i.49 9 0.72 1988.72 cf KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL TABLE 3.5.2B SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Published by SCS in t982) Runoff curve numbers for selected agricultural, suburban and urban land use for Type 1A rainfall distribution, 24-hour storm duration. CURVE NUMBERS BY HYDROLOGIC SOIL ROUP LAND USE DESCRIPTION A B D Cultivated land(t): winter cond'Rion 86 91 94 g5 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 81 86 Orchard: with cover crop 8t � 92 � Open spaces, lawns, parks, golf courses, cemeteries, landscaping. good condition: grass cover on 75% or more of the area 68 80 86 90 fair cond'Rion: grass cover on 50°,6 to 75°/, of the area 77 85 90 92 Gravel roads and parking lots 76 85 89 9t Dirt roads and parking lots 72 82 87 89 Impervious surfaces, pavement, roois, e[c. 98 98 98 98 Open water bodies: lakes, wetlands, ponds, etc. 100 100 100 t00 Single Family Residential (2) ' Dwelling Unit/Gross Acre °,6 Impervious (3} 1.0 DU/GA t5 Separate curve number 1.5 DU/GA 20 shall be selected 2.0 DU/GA 25 for pervious and 2.5 DU/GA 30 impervious portion 3.0 DU/GA 34 of the site or basi� 3.5 DU/GA 38 4.0 DU/GA 42 4.5 DU/GA 46 5.0 DU/GA 48 5.5 DU/GA 5a 6_0 DU/GA 52 6.5 DU/GA �4 7.0 DU/GA 56 Planned unit developments, % impervious condominiums, apartments, must be computed commercial business and � industrial areas. (t) For a more detailed description of agricultural land use curve numbers refer to National Engineering Handbook, Section 4, Hydrology, Chapter 9, August 1972. (2} Assumes roof and driveway runoff is directed into street/storm system. (3) The remaining penrious areas (lawn) are considered to be in good condition for these curve numbers. � 3.5.2-3 . 11/92 ��9 KING COUNTY, WASHINGTON, S URFACE W .� TER DESIGN MANUAL FIGURE 3.S.1C 2-YEAR 24-HOUR ISOPLUVIALS - -- –� _ ' --'-� �r– �; ��:: _� �.-- —�— – -- – –;s – -- _, � <<«P , �., _ `�;,�. -1 7 ',1 .__ ' '"�`�` '� ; _ � tr.r.P.. ��.a._t- �- �,� �y S n J,� � �s 1 .i` • `� � i? � � � '�.i � 1� �� .I `� � _ i. : � � � �'r �• i � � � ( :. l %�' � I ''� � � �'°� - .-KktqiM y � R I� � �J��; � -//� �i�, �iI^ � _ � � � � ; x� �:` r _ �,�- --_ � �� ; '.,� , � �� cV��y � �� + � �� -�~; �� _� �` � ,--_i , ` � ' �-_�� Y � -=�-�� '�.. •� _ _ 20 _ � � �� "��' �, �_` F.� � � �1 -� '° , �o�►'O � M.a.�;� � .�, ; � � iE :� �. ��, c„ rE�' Y..._�- "✓.. _ . . _� -�r� -�.�� .�ii i - . _ - y . I �L��y f. � � a-. / '. 1 'T"' a�� i ,.f .�,�.. ,.1 I� � r�{'x �� :! � _ ' �\: � �m� .��,�� - ✓ �i � � Msresr- -� � I ,1� � ' ��,� I ��.IS �"/ I � � - • v r "' 7 � � /�•� � j yIj ` �1�r �.,0�� I JrL � - ' / �,� s�+r. / _� ' '� � ( is� "'_ a m"'l ^.i _ �� ' � r � ` I t �� - ` ��} * I� „ � �� ; � 7 I - '�. �\ � ///J •� �', y i � •� ` I � .� 3 � � � �'�m � i + 1 �3 �. _ ' � �� C. M1011 � \�°a ' I O '�� r k y, ...�..� ��r �._.. �� 1,� !� � .. � '1' , � '� ff ` � � :. � y�l ' 1L/ � ' � ��MI I `��l � ' ^�• •�� ..�� /� I �� GL ' ' \� � j�.`\ \= v —_' _ _ _� _` \ ' � � .� � �ip'�'�'` � ; ,_ , �, ; � , �<, � �� u-- ; 1, _ � � I � I ! 9 �� R'� .� � •r` I 1 �, \ `;� � � I =r � ; '' � �i y i s�'r � \ � . 'Kp� � I �t'. �. I y .{ � \1 � - �i/1 :...' I .' r,7 � � :� ... `� I /� / i �jr � I/ . ! � \r '� 'u-�\ �- � �.`, I y` 1 �� I � , \\` ' � G� # -- —-- 1��, i ` ~ i �! � + b \ �� --- _ ,� � _ c� ry�'- ---/�� \ � ` `; Y'� � ��' `� - �.�'� �♦ �` _,- li - - { 1 - ' .�� F�_ � l� �.. � �..� ry�1'�'� '� , �.' �° d,..-- t _ �, �`` � � � »�� ... , - /' _' � �' �t _�_`, "�°, ---- – � — � ' ; yC ;� � v.y,� �\. i ,r � � S —/rS �/L7 ,� i• �. � ` _�,3.�.`- ;�., , , 2-YEAR 24-HOUR PRECIPl�'ATiON j � � ' � `�.� ' ' � � �� .�, �., �`=.r .3.4�' ISOPLUVIALS OF 2-YEAR 24-HOUR I �' s; ' , i ' � � S 35 r TOTAL PRECIPITATION IN INCHES � ' ' � r y'l � ��i _ 0 1 2 3 4 5 6 7 8 Miles � l � / `�' `ti �e+`��. ��=- --�. � �-20 i:soo,000 � 5 1_8 1/90 KING COUNTY, WASHINGTON, S URFACE WATER DESIGN M ANUAL FIGURE 3.S.lE 10-YEAR 24-HOUR ISOPLUVIALS Z.r ---- -;� --- _`� E_ r?-�-; �;�z� :::,- =� -- _��- --- --- - - - --- - - - 22 ��,,,� _ .`�� T , ` — � _, —� (� : — ' 23 � „ ,; — `=� ,:_ -�� '� .�`' :;; � � ,�y a i .•• „�„. : V� a � -----�a �1, �� ` u � 24 � ' - ; � � , I� �� r \'�� 4�-. �5 � � '- - ` `��,�� - �� , �--�=;� - ( 1 '`��,=_ �� 26 �, �- �rt� �, � -. ., .�- ��,.�. � � , 2•7 1 �� . � �� _�'� _� i �� :''J �- � �8 � £ � -�\�r"-� �� 1 ' �.I /^ ~ +� �: `��_ �-• -� __ • � �, �, / `� y ,� �� ` `•9 � . -,n <�� .ro* , — v. �'.� ' � ' ' � 1� "' . _ ' , � � '" ' �� `-�'= 3 p �, °; � � � ;��` �„ � � ,�. �,` — .: � � � �, �rnE� Vv� � F � � C � ,xk � < Y , F : � j `� .._, e '= , � - _ , i ,iY .I .' „ 3y �' ,�a � _ _ , � � �"�� ,�.�_�_ `�`" � �� :F, �� '\ ' ^� 'c� rercar`, r E-'' � S,� . '`_� _ � � ;t� I l _ j � ,r. � - 32 ;� � , .. ' ' :�--�.' � r ,_ I ,. ``€ ; `�-� ��, .9 � � - i' .�' ' =d 7 -f/ ,r � � �� \\ �\ `�,+r f �` L e_r� �� — I 4� ', :a3 _ - °�'�: / �� ... �# ' ' � � ' �r� _ : � .� � � �':. �'� ;'� � ` . � i � '1 %� �� - �..�1 7 •- .1'��' J `._ ' ( '�� - 1'l -J'�•S I V �1 _ ..- 4 4 I I .� I��,.L_ d,.,_ _ ._ -� _ �1 �y ya � ;s.�` — .�� :G�` .�u• �i�'�. I . \ O ' ' r�' S � ~'t ��\\' I `.`�- .. ._ _ �u l �` !y �' ' Y,�� / ��1 ' � �' � `\ /'v � � �t C` ... �,' _ � = Da Mena'-r . � �/ ! f� \ 1 ='��• � � �� r.,� _ , •f \1\ Y` ,.,:'� { � � � � .... �' I r' rr i .;f. :�J ` ' �,� q d ," :�r`�'� � ,� i`� ' , �1�. ` ^`J'< � \ � � � � � lp~ � - - --- - �- �_ �`'� \ a_-� ;` �j � J � �• i\ — i-�^ � � � �:i� A � '� � 1 ,�i� .p ':�� : . �� - -.�.�+ ��' � '` L r .�"'_� � 'Y�� i ,l � �� ..�,.�. ..-',i' .= �` -- � ' ` � ' jj ' % ' 'p / o'. 1 '� d � r �� _ - � �� _ ..� �� - � �IM�.� y ___ _ � ' V'j � � \ -�. '—--- �� -------� - � � ~,;�� f �� - i' � 1 i - -�J, �_- T -� • � � � ---��,-�'� -- � j0-YEAR 24—HOUR PRECIPITATION j `�. ;- ' �'% ��" ' �, , � - �� .i �0�.�5 � 3.4� ISOPLUVIALS OF 1Q-YEAR 24-HOUR � � �! _ TOTAL PRECIPITATION !N INCHES 3O � ' � } 3� �' ,,� � %� � ,� 0 1 2 3 4 5 6 7 8 Miles � � W ��,. ` "21 ,.�� 3.s.i-io � 3�5 ��-�� u ,�, 4.0 KING COliNTY, WASHINGTOiV, S L' RFACE WATER DESIGN :�1ANUAL FIGURE 3.51H 100-YE�R Z�3-HOIJR ISOPLLVI:�LS 3.p— — _.,. : : �,�.�- �..� ::., -�� - — -c�— - - -s - 3r �� ,y ;� - , ��, a � � 1 -- - - - -- �2 �,�'�` = r ` - `P: �,�," �_ - - i� -�`�� 33 a. , _ � , �, , � _ ��.. 3.q ` � a ��: ' _ � 1 � - k � �� '"" .iA� � ! ',rv I 3 � _ �,� �� , � � � _� '� -- ! r= , �. 3 3�� 3 1- L .:'. ��. _ �_ : �- r � ' � - �^ -- ` `-"�'RIAt '_ q�� I" � 1�t'3: 4� �,; � � t '\� ' �`�" `• � f ir 4 y _ ,= -_ t -- a '`. -� � ;; _ - �---- - �. �_,--. - , , - J \,. o� �IMnf.. i'.� � I �� 1` fi �' �} ��i .� 42� 1, � � �„ M _� . { � ,. , P,,, a ,� Q3 _ _ a -' -;,�,� � ` �;, �� _ �-'-� �,;� �a � � �_ �i�,�' waxur i , r i �--.� �..� O 44 ,. , � ~� °-'��,�� vee� _ .� ,' � '�-' J �° fi I � - :..+ / d P e e° 7 :I j � _, ` -, „ � P ,x , � — • '� ' / � A :� � 7 �- � e�� .A �� - � r �� . r – . � � � �� f 6f � �� e� S �\ � lSI�S ' ' ` •� � � � y // / i, � ��Q� �r ��, �- µ � -c'� � � / '""'� —^�'�` � 1 �) <�` r ,�� ' " � 4.6 �' ,� � ,� ,� � `- :� � , ,:�, , r _ 1� � ""� ' s o "�:"�'� � '�� ,`' � i j �� ' �''r� �� . r � . � t' -�'. ''tii� , � j � � � \ C- i \ r ;' � \ � � �� ,� '\� r-- .j � �' �sMon �,. . � :� T '. � �� o ! y _ � 'SI .a �l�-i _ J�'� � �� .�� : �_... — i � �y I° jy_L. , e„ ^� d / _ � uo �. �_ � �_� , a .� .... �; 1 � � ° r �` ' "" � ' � `i ; � � -� � �� " - ) _` Jo � � � /Ct V • � � �- �i! `� � ,r 1� I/ i I � � . �' /y � i � � `,,. '\ I� �'1 - \ i! x�nt �i r i � •r �_ � y I '� � � �• � 1 / `� � . � � � �� \ no / �°�` :a / ( � `j �w� \ ,.` 'w�` �r� .. I; r �_� �. I� i �� .. ` v`, �x r/ '`� � 1 . ..._ _. _ ` I � � ? z � _ , � d - . • � �.. \ _ /- ,�\ �`- , �,.� , ` - � v a � -� � p� � _ �u y - .+..,. �'` >,,.,: -� � ,'f' 'a " r / \ ,,,� °"'.�' „i CO 1�`� I � 'T� c : � - � ""��--�� - ._. ` ,�. '3's 1 "� L-y rr� �,-�� .� J�" _ /. ; Jt " � / �� ,� ; � � Vr , `� , � '�,_,— -�. '+. 1 j j � �" .��=' - � -- - - — , •; � Qc' ' � ��'�'`��\ �' � '� i �o �. �� :� :�a � � � _ � -�•_��"` 100-YEAR 24-HOUR PRECIPITATION ' �� i � � i t' �3.4�--ISOPLUVIALS OF 100-YEAR 24HOUR �`�� `� � � , �' S c'�� TOTAL PRECIPITATiON IN INCHES � p�� ` � `"' '�=� � 5'S '�� q � � — � ,f'� 0 1 2 3 4 5 6 7 8 Mlles � �„ ;��_�^ �6F��Z � 3.5.1-13 �`� !O :- �'�� -� ' 1:300,000 V' �" �inn Barone Garden Statuary Technical Information Report TIR Section 5: CONVEYANCE SYSTEM ANALYSIS AND DESIGN ' � ii � � ; ► ; , ; ��i �i i , � t - ; ; ,, , : � American Engineering Corporation, #0409 06/02/04 SZ Barone Garden Statuarv Technical Information Report Conveyance System Analysis and Design The existing and proposed stormwater conveyance system was analyzed for capacity to convey and contain the 25-year, 24-hour peak flow with a minimum of 0.5 ft of freeboard. Peak flow rates obtained using the rational method were used in conjunction with the King County Backwater Program (KCBW) to predict headwater elevations at each catch basin. Based on the results of the KCBW analysis program, at least 0_5 ft of&eeboard will be maintained during the 25-year 24-hour peak flow, and none of the catch basins will overflo�v during the 25-year, 24- hour storm event. A severe flooding problem should not be created or aggravated. BARONE GARDFN STATUARY CONVEYANCE ANALYSfS :___ __.. _ .__..___ May 3,2004 AEC#U404 I, __: _ _ ; ' TRIB TOTAL - _ AREA AREA Tc �Design V Design Return Frequency Location (AC) (AC) 'C' (min� aR bR PR iR IR (cfs) (fps) __ R=100-year CB#1 0.34 0.34 0.9 6.3 2.61 0.63 3.9 0.81�! 3.192424' 0.977 1.24 R=2ryear CB#1 0.34 0.34 0.9 6.3 2.66 0.&5 3.4 0.8041 2J33941 0.837 2 05 - Ofull 12'CPEP�?125%(oullet CB#1,Manning's Equation)= 3.71 cfs»0.96 cfs design,OK _; ._ . ;._ . I _ �._ _ ___ . _ . _ , _ ,_ . _ _. ;.. .___.. -- �HACK9AT'ER C011PII1'ER PROGRAIS POR PIPES � � , . ._._.__. . _ _. i--_------__. _____.__ `-----� -=-� --�---'u----�_._...� __�_ ��. , Pipe data from iile:of-cbi.bnp '. : • ; ; '� ` ! '---- ----- . _i-..__.. _. _ . -�------- , � _ -- ------ �. :-- --- ---- IIsinq a b�oad-crested veir at intermediete junctions '�. - . � i �. ... ;..._. .___. . _ ______.. --i-__ ...�._.- � Individual CB's subject to surchatged condition� _ ------ {�---- - -----. ;_--. . _' _.__' , � should be simulaced by raising the ovetflov elevation ' T ' � �rv . .._ __.. .. . ..__._ . .... ._..._ 'r..__- � - �� ---- .__ � .. _.._ . ` Lo an appropciate height above the cim elevation. �, �, - : ._ . _ _ ..__.. .. .... ; .___. T _._ ..-�- -- -- --i----� --"___.._.___. _ � i � ' Tailvater Elevation:33.63 Peet � :__._-- --_. . ; t , � , - - � ... .. ---- ----.'_.- "� '--- -'-- -' 'r-- --I----- ' � - ---...__.. t _ Discharge Range:0.84 to 0.98 Step o1 0.14 [cfaj ; �; ' j ; ' --. .. _. .. .._`---'i_-- ` - � ---T--7-- '--j- � � ? Overflos Elevation:38.9 feet � . ' . , � . ,. ..._ ----_.. .a- _-- ''------ ---.._. . ..-�-------... -- � _._ . ... Yeic:NONE _._. .__.. ,. ... . .. , ` ' _.. . ._. . , ._-- --` . .__ '___.. .._._. .,-__-_ ._.__..� ._._._.. � ; Upatream Velocity:l, ieet/sec ; ! ; ; t . � : __...- -- � :-_ . ._.. __... _._ __�_ _. _. .._.. --�� ----- -- � --- --- - � -� -�--- . .. ._ ..--- ----- � - .. , � - --+-- . _-_ -- . ', � � :___.--- -----__ __--_.... --._._-. _--- -'------ _- .�----- -�------... �_._-- ' -- - � _ � , � PIPL NO. 1: 8 LT 12"CP 8 1.25t OU77.LT. 33.50 INLET: 33.60 INTYP. 5 = ' ; �- _....._ ...------- ----------- ----------- ------ ...--. _.___._ ....___ . - ------. .------ - ` ---.�.-_ -=-------�-- ` JONC NO. 1: OVERFLOY-EL: 36.90 HLND: 90 DLG DIE/QIDTH: 2.5 Q-RiTIO: 0.00 ' . .._ . ... _ _-- ___.. _.__ , _._. __ . .. _... ___. .._-_._- �'---- � -- � --- � �--------t- �I --- ---- --__ � ._._ _--- ._.. ' ___ ' � �� . Q(CFS) Hy(FT) HB ELEV. * N-FAC DC � DN 1'Q DO DE HIIO HYI �� • ; ! .._. --- ---__. ..'------�- '- -.--' _-�---- � tttiti'Rflttlt titiftit tltYtiRiif�itifftiiiitltiftiiiitiVftttittlifliitiftfifitltt '�, i, ! . �._ . _..._._.. _...... _...... ....._.._ .. ._____._ ... _._"____ ._._.. .__ ....__...__..._...__ ._.._.__.__.-:___ • `__'___ ' � . 0.84 0.54 34.14 * 0.012 0.39 0.30 0.33 0.33 0.39 ***�* 0.54 ! �- . --... ___.__ ____ �__�-_ _ ___ ...__ _-. _ .. � . +-- -'- --' � 0.98 0.59 34.19 * 0.012 0.92 0 33 0.33 0.33 0.42 ***** 0 59 � � � T ' _... . ._ _.-- ---. __ .___ . _ . ...._ _._. .___._ .� ----- ---- -.. . _ . �- -� � t ; . ..__.. ._.___.__.. _ _.._ .__- �---- _----- -.___ _..__ ___ ,- --.._. ___._,��-'---F----- € . t..__ --_.___ ' __.. :____ `___._ .__.___ ..__. ' .. � '- -- .. �- ._._ ._._--- - ---.._._._--`----' ---- --t--- -�--- lPIPE NO. 2: 76 LF - 12^CP Q 2.313 OOTLLT: 33.60 INLET: 35.40 IN1'YP: 5 i I ', ( ._..__ --�- �-----_. .__- .--- �---- �--- _.._ _... _-- __._- � �----- � ` - - I ' I i t -__ ._ . --- --- ---- � -- . _ ._. .-- -�- ' ----' --- � , ; Q(CFS) H9�FT) HY ELEf7. * N-FAC DC DN 7'7 DO DE HYO H7I i i- I � � --- ----.._ .. _----- --- --- __._ ___ __.. _-----_ .....__. -.__--------- '----. attritr+rxrtrtttrt�twtrtxrritfissrsttttrst�:ir�r+rtrai�trs�trr:aetrrsr+twsrtsrt ! �---+- � i , � . . . .. .. ____ .____.. .__._ ___. _.._ _____.. .. _..__. .. . t' ___ _. _-"_. _ -t ___"_ .,_ ; _ 0.84 0.51 35.91 * 0.012 0.39 0.26 0.59 0.54 0.39 ***** 0.51 ; j i � � ___..._ ._-___. ..._ _...._......___'__.._._.__ .._.�_-'-___�*__' ' '_A-'_'-_.... ' 0.96 0.56 35.96 * 0.012 0.42 0.28 0.59 0.59 0.42 ***** 0.56 ' ' -� � : Ameriean E�igineering Corporution, #NJ�I ' , 06/02/04 Barone Garden Statuary Technical Information Report TIR Section 6: SPECIAL REPORTS AND STUDIES Geotechnical Engineering Study (detached) Barone Gardens Statuary Prepared by Geo Group Northwest, Inc. Apri12, 2004 American Engineering Corporation, #0404 06/02/04 b^� Barone Garden Statuary Technical Information Report ; TIR Section 7: OTHER PERMITS Water (City of Renton) Sewer (City of Renton) American Engineering Corporation, #U4U-1 06/02/04 �1 Barone Garden Statuary Technical Information Report TIR Section S: ESC ANALYSIS AND DESIGN ;:.,- ; I �� , , :: �,. : . , .�.� _ �� , , � � ��` kE�� F.-�"�.�'�� u fL`"..� .. . - . €(. ) I,��.�.: . . . American Engineering Corporation, #t0904 06/02/04 S'Z Barone Garden Statuary Technical Information Report ESC Analysis and Design The following erosion and sedimentation control measures will be used to help prevent the transport of sediment from the project site: Clearing Limits Clearing limits will be delineated using either siltation fencing or plastic orange protective fencing. Cover Measures Temporary cover will be installed if an area is to remain umvorked for more than seven days during the dry season (May 1 to September 30), or for more than two working days during the wet season(October 1 to Apri130). Stockpiles will be covered if they remain unworked for more than 12 hours during the wet season. Cover used shall be mulch, seed, and/or plastic � covering. Perimiter Protection I Approximately 480 lf of siltation fence will be installed along the site perimeter, to reduce the amount of sediment transported beyond the disturbed area. Trafftc Area Stabilization Stabilized construction entrances will be installed per C.O.R s.p. drawing BR23. The construction entrances will be a minimum of 50 ft in length. Sediment Retention The proposed detention pond will act as a redundancy to further prevent sediment transport from the site. Catch basin protection will be provided as necessary. Surface Water Controls Surface water will flow directly to the proposed detention pond or conveyance system within the site. American Engineering Corporation, #0404 06/02/04 8'2 Barone Garden Statuary Technical Information Report TIR Section 9: i' BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT (To be submitted at later date as required) :lmericcirt�ngineerin�(.orporunon, +�O-JU�# 06/02/04 9-Z Barone Garden Statuary Technical Information Report TIR Section 10: OPERATIONS AND MAINTENANCE MANUAL i American Engineering Corporation, #0404 06/02/04 �0`2 __ 1 K[NG COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL i ' il � MAINTENANCE STANDARDS FOR '� PRIVATELY MAINTAINED DRAINAGE FACILITIES NO. 1 -DETENTION PONDS Maintenance Defect Conditions When Maintenance Results Expected When Component Is Needed Maintenance Is Performed General Trash 8�Debris Any trash and debris which exceed 1 cubic foot Trash and debris cleared from site. per 1,000 square feet(this is about equal to the amount of Uash it would take to fill up one standard size office garbage qn). In general, there should be no visuai evidence of dumping. Poisonous Vegetation Any poisonous or nuisance vegetation which No danger of poisonous vegetation may constitute a hazard to County personnel or where County personnel or the the public. public might normally be. (Coordination with Seattle-King County Health Department) Pollution Oil,gasoline,or other contaminants of one No contaminants present other than gallon or more or any amount found that could: a surface film. (Coordination with I 1)cause damage to plant,animal,or marine life; Seattle/King County Health 2)constitute a fire hazard;or 3)be flushed Department) downstream during rain storms. Unmowed Grass/ If facility is located in private residential area, When mowing is needed, Ground Cover mowing is needed when grass exceeds 18 grass/ground cover should be inches in height. in other areas,the general mowed to 2 inches in height. � policy is to make the pond site match adjacent Mowing of selected higher use ground cover and terrain as long as there is no areas rather than the entire slope interference with the function of the facility. may be acceptable for some situations. Rodent Holes Any evidence of rodent holes if faciliry is acting Rodents destroyed and dam or as a dam or berm,or any evidence of water bertn repaired. (Coordination with piping through dam or berm via rodent holes. Seattle/King County Health Department) Insects When insects such as wasps and hornets Insects destroyed or removed from interfere with maintenance activities. site. Tree Growth Tree growth dces not allow maintenance access Trees do not hinder maintenance or interferes with maintenance activiry(i.e.,slope activities. Selectively culdvate trees mowing,silt removal,vactoring,or equipment such as alders for firewood. movements). If trees are not interfering with access,leave trees alone. Side Slopes of Pond Erosion Eroded damage over 2 inches deep where Slopes should be stabilized by quse of damage is still present or where there using appropriate erosion control is potential for continued erosion. measure(s);e.g.,rodc reinforcement,planting of grass, compaction. Storage Area Sediment Accumulated sediment that exceeds 10°/a of the Sediment cleaned out to designed designed pond depth. pond shape and depth;pond reseeded if necessary to control erosion. Pond Dikes Settlements Any part of dike which has settled 4 inches lower Dike should be built back to the than the design elevadon. design elevabon. Emergency Rodc Missing Only one layer of rock exists above native sal in Replace rocks to design standards. OverflowlSpillway area five square feet or larger,or any exposure of native soil at the top of out flow path of spilMray. Rip-rap on inside slopes need not be replaced. 1998 Surface Water Design Manual 9/1/98 A-1 10-2 APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES NO. 2 -INFILTRATION Maintenance Defect Conditions When Maintenance Results Expected When Component Is Needed Maintenance Is Performed General Trash&Debris See"Ponds"Standard No. 1 See"Ponds"Standard No. 1 Poisonous Vegetation See"Ponds"Standard No.1 See"Ponds"Standard No.1 Pollution See"Ponds"Standard No.1 See"Ponds"Standard No.1 Unmowed Grass/ See"Ponds'Standard No.1 See"Ponds"Standard No.1 Ground Cover Rodent Holes See"Ponds"Standard No. 1 See"Ponds"Standard No.1 {nsects See"Ponds'Standard No. 1 See"Ponds"Standard No.1 Storage Area Sediment A percolation test pit or test of faality indicates Sediment is removed and/or faality facility is only working at 90°/a of its designed is deaned so that infiltration system capabilities. tf two inches or more sediment is worics according to design. present,remove. Sheet Cover(If Sheet cover is visible and has more that three Sheet cover repaired or replaced. Applicable) 1/4-inch holes in it. Sump Filled with Any sediment and debris filling vault to 10%of Clean out sump to design depth. Sediment and Debris depth from sump bottom to bottom of ouUet pipe (If Applicable) or obstrucGng flow into the connector pipe. Filter Bags Filled with Sediment Sediment and debris fill bag more than 1/2 full. Replace filter bag or redesign and Debris system. Rock Filters Sediment and Debris By visual inspection,little or no water flows Replace gravel in rock filter. through fiiter during heavy rain storms. Side Slopes of Pond Erosion See"Ponds"Standard No. 1 See"Ponds"Standard No.1 Emergency Rodc Missing See"Ponds"Standard No. 1 Overflow Spillway Settling Ponds and Sediment Remove when 6"or more. Vaults Note: Sediment accumulation of more than.25 inches per year may indicate excessive erosion is occurring upst�eam of the facility or that conveyance systems are not being pr�pedy maintained. The contribu6ng drainage area shoufd be checked for erosion problems or inadequate maintenance of conveyance systems if excessive sedimentation is noted in an infiRration facility. Check twice a year during frrst 2 years of operation;once a year thereaRer. Clean manholes/catch basins,repair damaged inlets/outlets, clean irash racks. 9/1/98 1998 Surface Water Design Manual - A-2 �d 3 APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACIUTIES NO. 3 -CLOSED DETENTION SYSTEMS (PIPESlTANKS) �, Maintenance Defect Conditions When Maintenance is Needed Results Expected When Component Maintenance is Performed ' Storage Area Plugged Air Vents One-half of the cross sec6on of a vent is blocked at Vents free of debris and any point with debris and sediment sediment , Debris and Accumulated sediment depth exceeds 10%of the All sediment and debris Sediment diameter of the storage area for'h length of storage removed from storage area. vault or any pant depth exceeds 15%of diameter. Example:72-inch storage tank would require cieaning when sediment reaches depth of 7 inches for more than Y�length of tank. Joints Between Any aack allowing material to be transported into All joint between tank/pipe Tank/Pipe Section facility sections are sealed Tank Pipe Bent Any part of tank/pipe is bent out of shape more than Tank/pipe repaired or replaced Out of Shape 10%of iPs design shape to design. Manhole Cover Not in Place Cover is missing or only partially in place.Any open Manhole is closed. manhole requires maintenance. � Locking Mechanism cannot be opened by one maintenance Mechanism opens with proper � Mechanism Not person with proper tools.Bolts into frame have less tools. Working than%z 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 SOlbs of lift. Intent is to keep cover from reinstalled by one maintenance sealing off access to maintenance. person. Ladder Rungs King County Safety Office and/or maintenance person Ladder meeLs design standards I Unsafe judges that ladder is unsafe due to missing rungs, allows maintenance person safe misalignment,rust,or cracks. access. Catch Basins See"Catch Basins"Standards No.5 See"Catch Basins"Standards No.5 :-; �. : . � -- � F_.' . � � I� i.w �4 �_:. _ .. f . I��.�i�� . l . � �.'.(((-yyy-. �??? k_� ( . f 1998 Surface Water Design Manual 9/1/98 , A-3 �0�LL T APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES NO.4-CONTROL STRUCTURE/FLOW RESTRICTOR Maintenance Defect Condition When Maintenance is Needed Results Expected When Component Maintenance is Performed General Trash and Debris Distance between debris build-up and bottom of All trash and debris removed. (Includes Sediment) orifice plate is less than 1-1/2 feet. Structural Damage Structure is not securely attached to manhole wall Structure securely attached to and outlet pipe sUucture should support at least wall and outlet pipe. 1,000 Ibs of up or down pressure. Structure is not in upright position(allow up to Structure in correct position. 10%from plumb). Connections to outlet pipe are not watertight and Connections to outlet pipe are show signs of rust. water tight;structure repaired or replaced and works as designed. Any holes—other than designed holes—in the Structure has no holes other structure. than designed holes. Cleanout Gate Damaged or Missing Cleanout gate is not watertight or is missing. Gate is watertight and works as designed. Gate cannot be moved up and down by one Gate moves up and down easily maintenance person. and is watertight. Chain leading to gate is missing or damaged. Chain is in place and works as designed. Gate is rusted over 50%of its surface area. Gate is repaired or replaced to meet design standards.. Orifice Plate Damaged or Missing Control device is not working properly due to Plate is in place and works as missing,out of place,or bent orifice plate. designed. ObstrucGons Any trash,debris,sediment,or vegetation Plate is free of all obstructions blocking the plate. and works as designed. Overflow Pipe Obstructions Any trash or debris blocking(or having the Pipe is free of all obstructions potential of blocking)the overflow pipe. and works as designed. Manhole See'Closed DetenUon Systems"Standards No.3 See"Closed Detention Systems' Standards No.3 Catch Basin See"Catch Basins"Standards No.5 See'Catch Basins"Standards No.5 9/I/98 1998 Surface Water Design Manual a-a /0-� APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES NO. 5-CATCH BASINS Maintenance Defect Conditions When Maintenance is Needed Results Expected When Component Maintenance is performed General Trash&Debris Trash or debris of more than 1/2 cubic foot which is No Trash or debris iocated (Includes Sediment) located immediately in front of the catch basin immediately in front of catch opening or is blocking capacity of the basin by basin opening. more than 10% Trash or debris(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. i pipe into or out of the basin. Trash or debris in any inlet or outlet pipe blocking Inlet and ouUet pipes free of more than 1/3 of its height. trash 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 I' volume would attract or support the breeding of insects or rodents. Structure Damage to Comer of frame extends more than 3/4 inch past Frame is even with curb. Ii Frame and/or Top Slab curb face into the street Qf applicable). �� Top slab has hotes�arger than 2 square inches or Top slab is free of holes and cracks wider than 1/4 inch(intent is to make sure cracks. all material is running into basin). Frame not sitting flush on top slab,i.e.,separation Frame is sitting flush on top of more than 3/4 inch of the frame from the top slab. slab. Cracks in Basin Walls/ Cradcs wider than 1!2 inch and longer than 3 feet, Basin replaced or repaired to Bottom any evidence of soil partiGes entering catch basin design standards. through cracks,or maintenance person judges that struclure is unsound. Cradcs wider than 1/2 inch and longer than 1 foot No cracks more than 1/4 inch at the jant of any in1eV outlet pipe or any evidence wide at the joint of inleUoutlet of soil partictes entering catch basin through pipe. cracks. Sedimenb Basin has settled more than 1 inch w has rotated Basin replaced or repaired to Misalignment more than 2 inches out of alignment. design standards. I 1998 Surface Water Design Manual 9/1/98 A-s /0-6 APPENDIX A 1�tAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES NO. 5 -CATCH BASINS(CONTINUFD) Maintenance Defect Conditions When Maintenance is Needed Results Expected When Component Maintenance is performed Fire Hazard Presence of chemipls such as natural gas,al and No flammable chemicals gasoline. present. Vegetation Vegetation growing across and blocking more than No vegetadon blocking opening 10%of the basin opening. to basin. Vegetation growing in inlet/outlet pipe joints that is No vegeta6on or root growth more than six inches tall and less than six inches present. apart. Pollution Nonflammabie chemicals of more than 1/2 cubic foot No pollu6on present other than per three feet of basin length. surface film. Catch Basin Cover Cover Not in Place Cover is missing or only partially in place.Any open Catch basin cover is Gosed catch basin requires maintenance. Locking Mechanism Mechanism qnnot be opened by on maintenance Mechanism opens with proper Not Working person with proper tools.Bolts into frame have less tools. than 112 inch of thread. Cover Difficult to One maintenance person cannot remove lid after Cover can be removed by one 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 standarcJs Unsafe rust,cracks,or sharp edges. and allows maintenance person safe access. Metai Grates Grate with opening wider than 7/8 inch. Grate opening meets design (If Applicable) standards. Trash and Debris Trash and debris that is blocking more than 20°�of Grate free of Vash and debris. grate surface. Damaged or Grate missing or broken member(s)of the grate. Grate is in place and meets Missing. design standards. NO. 6 DEBRIS BARRIERS (E.G.,TRASH RACKS) Maintenance Defect Condition When Maintenance is Needed Resuits Expected When Components Maintenance is Performed. General Trash and Debris Trash or debris that is plugging more than 20%of Barrier clear to receive capacity the openings in the barrier. flow. Metal Damaged/M'issing Bars are bent out of shape more 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 according to design. Bars are loose and rust is causing 50%deterioration Repair or replace barrier to to any part of barrier. design standards. 9/1/98 1998 Surface Water Design Manual a-6 �p 7 APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MA[NTAINED DRAINAGE FACILITIES NO. 7 -ENERGY DISSIPATERS Maintenance Defect Conditions When Maintenance is Needed Results Expected When Components Maintenance is Performed. Extemal: Rock Pad Missing or Moved Only one layer of rock exists above native soil in Replace rocks to design Rock area five square feet or larger,or any exposure of standards. native soil. Dispersion Trench Pipe Plugged with Accumulated sediment that exceeds 20%of the Pipe cleaned/flushed so that it Sediment design depth. matches design. Not Discharging Visual evidence of water discharging at Trench must be redesigned or Water Properly concentrated points along trench(normal condition rebuilt to standards. is a"sheet flovd'of water along trench). Intent is to prevent erosion damage. PerforaGons Over 1/2 of perforations in pipe are plugged with Clean or replace perforated pipe. Plugged. debris and sediment. Water Flows Out Mai�tenance person observes water flowing out Facility must be rebuilt or Top of"Distributo�' during any storm less than the design storm or its redesigned to standards. Catch Basin. causing or appears likely to cause damage. Receiving Area Water in receiving area is causing or has potential No danger of landslides. Over-Saturated of causing landslide problems. Intemal: Manhole/Chamber Wom or Damaged Structure dissipa6ng flow deteriorates to 1/2 or Replace structure to design Post.Baffles,Side original size or any concentrated wom spot standards. of Chamber exceeding one square foot which wouid make i structure unsound. Other Defects See"Catch Basins"Standard No.5 See"Catch Basins"Standard No. I 5 �I i j i 1998 Surface Water Design Manual 9/1/98 . A-� /o-8 � _ APPENDIX A MAINTENANCE STA�IDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES NO. 8-FENCING Maintenance Defect Conditions When Maintenance is Needed Results Expected When Components Maintenance is PerFormed General Missing or Broken Any defect in the fence that permits easy entry Parts in place to provide adequate Parts to a facility. security. Erosion Erosion more than 4 inches high and 12-18 No opening under the fence that inches wide permitting an opening under a exceeds 4 inches in height. fence. Wire Fences damaged Parts Post out of plumb more than 6 inches. Post piumb to within 1-1/2 inches. Top rails bent more than 6 inches. Top rail free of bends greater than 1 incF►. Any part of fence(inGuding post,top rails,and Fence is aligned and meets design fabric)more than 1 foot out of design alignment. standards. Missing or loose tension wire. Tension wire in place and holding fabric. Missing or loose barbed wire that is sagging Barbed wire in pface with less than more than 2-1/2 inches belween posts. 3/4 inch sag between post. Extension arm missing,broken,or bent out of Extension arrr►in place with no shape more than 1 1/2 inches. bends larger than 3/4 inch. Deteriorated Paint or Part or parts that have a rusting or scaling Structurally adequate posts or Protective Coating condition that has affected structural adequacy. parts with a uniform protective coating. Openings in Fabric Openings in fabric are such that an 8-inch- No openings in fabric. diameter ball could fit through. NO. 9-GATES Maintenance Defect Conditions When Maintenance is Needed Results Expected When Component Maintenance is Performed General Damaged or Missing Missing gate or lodcing devices. Gates and Locking devices in Members place. Broken or missing hinges such that gate cannot Hinges intact and lubed.Gate is be easily opened and closed by a maintenance worlcing freely. person. Gate is out of plumb more than 6 inches and Gate is aligned and vertical. more than 1 foot out of design alignment. Missing stretcher bar,stretcher bands,and tles. Stretcher bar,bands and ties in place. Openings in Fabric See"Fenang"Standard No.8 See"Fencing"Standard No.8 9/1/98 1998 Surface Water Design Manual A-g /o-9 APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES NO. 10-CONVEYANCE SYSTEMS (PIPES 8� DITCHES) Maintenance Defect Conditions When Maintenance is Needed Results Expected When Component Maintenance is Performed Pipes Sediment 8 Debris Accumulated sediment that exceeds 20%of the Pipe cleaned of all sediment diameter of the pipe. and debris. i Vegetation Vegetation that reduces free movement of water All vegetation removed so water ; through pipes. flows freely through pipes. i Damaged Protective coating is damaged;rust is causing Pipe repaired or replaced. I� more than 509�o deterioradon to any part of pipe. Any dent that decreases the cross section area of Pipe repaired or replaced. � pipe by more than 20°k_ Open Ditches Trash&Debris Trash and debris exceeds 1 cubic foot per 1,000 Trash and debris cieared from square feet of ditch and slopes. ditches. Sediment Accumutated sediment that exceeds 20%of the Ditch deaned/flushed of all ' design depth. sediment and debris so that it 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. Applicable). � Catch Basins See"Catch Basins:Standard No.5 See"Catch Basins'Standard No.5 Debris Barriers See"Debris Barriers'Standard No.6 See"Debris Barriers"SNandard (e.g.,Trash Rack) No.6 N0. 11 -GROUNDS(LANDSCAPING) Maintenance Defect Conditions When MaiMenance is Needed Results Expected When Component Maintenance is Performed General Weeds Weeds growing in more than 20°�of the landscaped Weeds present in less than 5% (Nonpoisonous) area(trees and shrubs only). of the landscaped area. Safety Hazard Any presence of poison ivy or other poisonous No poisonous vegetation vegetation. present in landscaped area. Trash or Litter Paper,cans,bottles,totaling more than 1 cubic foot Area clear of litter. within a landscaped area(trees and shrubs only)of 1,000 square feet. Trees and Shrubs Damaged Limbs or parts of trees or shrubs that are split or Trees and shrubs with less than broken which affect more than 25%of the total 5°k of total foliage with split or foliage of the tree or shrub. broken limbs. Trees or shrubs that have been blown down or Tree or shrub in place free of knodced over. injury. Trees or shrubs which are not adequately supported Tree or shrub in place and or are leaning over,causing exposure of the roots. adequately supported;remove any dead or diseased trees. 1998 Surface Water Design Manual 9/1/98 A-9 �D��D APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAI�IED DRAINAGE FACILITIES N0. 12-ACCESS ROADS/EASEMENTS Maintenance Defect Condition When Maintenance is Needed Results Expected When Component Maintenance is Performed General Trash and Debris Trash and debris exceeds 1 cubic foot per 1,000 Roadway free of debris which square feet i.e.,trash and debris would fill up could damage tires. one standards size garbage can. Blocked Roadway Debris which could damage vehicle tires(glass Roadway free of debris which or metal). could damage tires. Any obstruction which reduces clearance above Roadway ovefiead clear to 14 feet road surface to less than 14 feet. high. Any obstruction restricting the access to a 10 to Obstruction removed to allow at 12 foot width for a distance of more than 12 feet least a 12 foot access. or any point restricting acoess to less than a 10 foot width. Road SurFace Settiement,Potholes, When any surface defect exceeds 6 inches in Road surface uniformly smooth Mush Spots,Ruts depth and 6 square feet in area.In general,any with no evidence of settlement, surface defect which hinders or prevents potholes,mush spots,or ruts. maintenance access. Vegetation in Road Weeds growing in the road surface that are Road surface free of weeds taller Surface more than 6 inches tall and less than 6 inches than 2 inches. tall and less than 6 inches apart within a 400- square foot area. Modular Grid Build-up of sediment mildly contaminated with Removal of sediment and disposal Pavement petroleum hydrocarbons. in keeping with Health Department recommendations for mildly contaminated soi(s or catch basin sediments. Shoulders and Erasion Damage Erosion within 1 foot of the roadway more than 8 Shoulder free of erosion and Ditches inches wide and 6 inches deep. matching the surrounding road. Weeds and Brush Weeds and brush exceed 18 inches in height or Weeds and brush cut to 2 inches hinder maintenance access. in height or deared in such a way as to allow maintenance access. 9/1/98 1998 Sudace Water Design Manual A-10 �D_�/ i APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES NO. 13-WATER QUALITY FACILITIES i A.) Biofiitration Swale Maintenance Defect Condition When Maintenance is Needed Results Expected When Component Maintenance is Performed BiofilVation swale Sediment Accumulation Sediment depth exceeds 2-inches No sediment deposits on grass on Grass Layer layer of the bio-swale,which would impede filtration of runoff. Vegeta6on When the grass becomes excessively tall Vegetation is mowed or nuisance (greater than 10-inches);when nuisance weeds vegetation is eradipted,such that and other vegetation starts to take over. flow not impeded.Grass should be mowed to a height between 4 inches and 9 inches. � Inlet Outlet Pipe Inlet/outlet pipe clogged with sediment and/or No clogging or blockage in the inlet debris. and outlet piping. Trash and Debris Trash and debris accumulated in the bio-swale. Trash and debris removed from Accumulation biaswale. Erosion/Scouring Where the bio-swa�e has eroded or scoured Bioswale should be re-graded and the bottom due to flow channelization,or higher re-seeded to specification,to j flows. eliminated channeled flow. � Overseeded when bare spots are evident. N0. 13-WATER 4UALITY FACILITIES (CONTI11fUED) B.) Grasslined Filter Strips Maintenance Defect Condition When Maintenance is Needed Results Expected When Component Maintenance is Performed Filter Strip Sediment Accumulation Sediment depth exceeds 2 inches. No sediment deposits on grass on Grass Layer layer of the filter strip,which would impede filtration runoff. Vegetation When the grass becomes excessively tall Vegetation is mowed or nuisance (greater than 10-inches);when nuisance weeds vegetadon is eradicated,such that and other vegetation starts to take over. flow not impeded.Grass should be � mowed to a height befinieen 4 I inches and 9 inches. , Trash and Debris Trash and debris accumulated on the filter Trash and Debris removed from Accumulation ship. filter. Erosion/Soouring Where the filter strip has eroded or scoured SVip should be re-graded and re- due to flow channelization,or higher flows. seeded speafication,to eliminate channeled flow.Overseeded when bare spots are evident. V-Notch Pipe Weir When the V-Notch pipe becomes damaged or Cleaned and properiy functioning clogged with sedimenV debris. weir,such that flows uniformly spread. 1998 Surface Water Design Manual 9/1/98 . A-11 ��_�Z APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAWAGE FACILITIES C.)Wetponds Maintenance Defect Condition When Maintenance is Needed Results Expected When Component Maintenance is Performed Wetpond Vegetation Vegetation such as grass and weeds need to be Vegetation should be mowed to mowed when it starts to impede aeslhetics of pond. 4 to 5 inches in height. Trees Mowing is generally required when height exceeds and bushes should be removed 1 S-inches.Mowed vegetation should be removed where they are interfering with from areas where it could enter the pond,either pond maintenance activities. when the pond level rises,or by rainfall runoff. Trash and Debris Accumulation that exceeds 1 CF per 1000-SF of Trash and debris removed from pond area. pond. InIeU Outlet Pipe InIeU OuUet pipe clogged with sediment and!or No clogging or blockage in the debris material. inlet and outlet piping. Sediment Sediment accumulations in pond bottom that Removal of sediment from pond Accumulation in Pond exceeds the depth of sediment zone plus 6-inches, bottom. Bottom usually the first cell. Oil Sheen on Water Prevalent and visible oil sheen. Removal of sediment from pond bottom. Erosion Erosion of the pond's side slopes and/or scouring of Slopes should be stabilized by the pond bottom,that exceeds 6-inches,or where using proper erosion control continued erosion is prevalent. measures,and repair methods. Settlement of Pond Any part of these components that has settled 4- Dike/berm is repaired to Dike/Berm inches or lower than the design elevation,or specifica6ons. inspector determines dike/berm is unsound. Rock Window Rock window is clogged with sediment. Window is free ot sediment and debris. Overflow Spillway Rock is missing and soil is expased at top of Replace rocks to specifications. spillway or outside slope. 9/1/98 1998 Surface Water Design Manual a-i2 l�_13 APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTA[NED DRAINAGE FACILITIES NO. 13-WATER QUALITY FACILITIES (CONTIIIlUED) D.)Wetvaults Maintenance Defect Condition When Maintenance is Needed Results Expected When � Component Maintenance is Performed Wetvault Trash/Debris Trash and debris accumulated in vault,pipe or Trash and debris removed from I� Accumulation inleU outlet,(inGudes floatables and non- vault. i floatables). Sediment Accumulation Sediment accumulation in vault bottom that Removal of sediment from vault. in Vault exceeds the depth of the sediment zone plus 6- � inches. Damaged Pipes Inlet/ouUet piping damaged or broken and in Pipe repaired and/or replaced. � need of repair. Access Cover Cover cannot be opened or removed,especially Pipe repaired or replaced to Damaged!Not Working by one person. proper working specifip6ons. Vault Structure Vault:Cracks wider than 1/2-inch and any No cracks wider than 1/4-inch at I Damaged evidence of sal particles entering the structure the joint of the inleU outlet pipe. through the cracks,or maintenance/inspection Vault is determined to be personnel determines that the vault is not structurally sound. structurally sound. Baffles Baffles corroding,cracking,warping and/or Repair or replace baffles to �I showing signs of failure as determined by specifications. maintenance!inspecdon staff. Access Ladder Damage Ladder is corroded or deteriorated,not functioning Ladder replaced or repaired to i properly,missing rungs,has cracks and/or specifications,and is safe to I misaligned. use as determined by inspecdon I personnel. ' � I 1998 Surface Water Design Manual 9/1/98 � � A-13 ��,.�d T APPENDIX A 1�fAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES N0. 13 -WATER QUALITY FACILITIES(CONTINUED) E.)Sand Filters Maintenance Defect Condition When Maintenance is Needed Results Expected When Component Maintenance is Performed Above Ground Sediment Sediment depth exceeds 1/2-inch. No sediment deposit on grass Accumulation on Grass layer of sand filter which would Layer impede permeability of the filter section. Trash and Debris Trash and debris accumulated on sand filter bed. Trash and debris removed from Accumulations sand filter bed. Sediment/Debris in When the yard drain CB's and clean-out become Sediment,material from the Yard Drains/Clean- full or partialiy plugged with sediment and/or CB's and clean-0uts removed. Outs] debris. Vegetation When the grass becomes excessively tali(greater Vegetation is mowed or than 6-inches);when nuisance weeds and other nuisance vegetation is vegetation starts to Fake over. eradicated,such that flow is not impeded. Sand Filter Media Drawdown of water through the sand filter media, Usually requires replacement of takes longer than 24hours,and/or flow through top 6 to 12-inches of inedia. the overflow pipes occurs frequentty. May require replacement of entire sand filter sec6on, depending on sec6on. Prolonged flows Sand is saturated for prolonged periods of time Limit the low,continuous flows (several weeks)and does not dry out between to a small portion of the faality storms due to c�ntinuous base flow or proionged by using a low wooden divider or flows from detention facilities. slightly depressed sand surface. Short Circuiting When flows beoome concentrated over the sand Flow and percolation of water filter rather than dispersed. through the sand filter is uniform and dispersed across the filter section. Erosion Damage to Erosion over 2-inches deep where cause of Slopes should be stabilized by Slopes damage is prevalent or potential for continued using proper erosion control erosion is evident measures. Rock Pad Missing or Soil beneath the rock is visible. Replace or rebuild the rock pad Out of Place to design specifications. V-Notch Pipe Weir When the V-Notch pipe becomes damaged or Clean and properly functioning dogged with sediment/debris. weir,such that flows uniformly spread. Damaged Pipes Any part of the piping that is crushed or deformed Pipe repaired or replaced. more than 20%or any other failure to the piping. Below Ground Sediment Sediment depth exceeds 1/2-inch. No sediment deposits on sand Vault. Accumulation on Sand filter section,which would Media Section impede permeability of the filter section. Sediment Sediment depth exceeds 6-inches in vault bottom. No sediment deposit in the first Accumulation in Vault chamber of the vault. Trash/Debris Trash and debris accumulated in vault,or pipe Trash and debris removed from Accumulation inleU outlet,floatables and non-floatables vault,and inleb outlet piping. Sediment in Drain When drain pipes,cleanouts,and yard drains Remove the material from the Pipes/Yard Drains/ become full with sediment and/or debris. facilities. Cleanouts 9/1/98 1998 Surface Water Design Manual A-14 ��'�5-- APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTA[NED DRAINAGE FACILITIES N0. 13-WATER QUALITY FACILITIES (CONTlNUED) E.} Sand Filters(Continued) Maintenance Defect Conditions When Maintenance is Needed Results Expected When Component Maintenance is Performed Below Ground Short CircuiGng When seepage/flow occurs along the vault walls Sand filter media secdo�re-laid Vault(Continued) and comers. and compacted along perimeter of vault to form a semi-seal. Vertical Riser Pipes Plugged,failure due to cracking deformation. Flows Clean out the riser pipe;replace tend to back-up in first chamber of the vault. pipe as needed. Damaged Pipes Inlet or ou8et piping damaged or broken and in Pipe repaired and/or replaced. need of repair. Access Cover Cover cannot be opened,one person cannot open Cover repaired to proper Damaged/Not the cover,corrosion!deformation of cover. working specifications or Working replaced. Vault Structure Cracks wider than 1/2-inch and any evidence of sal Vault replaced or repaired to Damaged;Indudes particles entering the structure through the cradcs, design specifiqtions. Cracks in Walls, or maintenance/inspection personnel determines Bottom,Damage to that the vauit is not structurally sound. Frame and/or Top Slab. Cradcs wider than 1/2-inch at the joints of any inleU No cracks more than 1/4-inch ouUet pipe or any evidence of soil particles entering wide at the joint of the inleU the vault through the walls. outlet pipe. Baffles Baffles corroding,cracking,warping and/or showing Repair or replace baffles to II signs of failure as determined by maintenance/ specifiptions. � inspection person. ' Access Ladder Ladder is corroded or deteriorated,not functioning Ladder replaced or repaired to Damaged properly,missing rungs,cracks,and misaligned. specifications,and is safe to use as determined by inspection personnel. 1998 Sudace Water Design Manual 9/1/98 ,- A-is /o/6 APPENDIX A MAINTENANCE STANDARDS FOR PWVATELY MAINTAINED DRAINAGE FACILITIES NO. 13 -WATER QUALITY FACILITIES (CONTlNUED) F.) Leaf Compost Filters _ Maintenance Defect Conditions When Maintenance is Needed Resuits Expected When Component Maintenance is Performed Above Ground Sediment Sediment depth exceeds 0.25-inches. No sediment deposits on fabric Open Swale accumulation on Geo- layer which wouid impede Textile/media permeability of the fabric. Trash and debris Trash and debris accumulated on compost filter Trash and debris removed from accumulations bed. compost filter bed. SedimenU debris in When the yard drain CB's and dean-outs become Remove the accumulated drain/yard drains/ full of sediment andJ or debris. material from the facility. clean-outs. Vegetation Vegetation impending flow through section,or Vegetation is mowed or encroaching into compost media. eradicated such that flow is no longerimpeded. Leaf Compost Media Drawdown of water through the leaf compost, Replace media with new to takes longer than 12-hours,and/or flow through design specifications,in addition the overfiow pipes occurs frequently. to replacing fabric. Short-Circuiting When Channeled flow occurs over the leaf inedia; Flow is unifom�over the entire and where flow perks through the media at the width of the media section,and baffles. concentrated percolation does not occur at the baffle walls. Media needs to be graded and re-set at the baffles to form a seal.Weir plate may need to be adjusted in addition. Erosion Damage to Eroded damage over 2-inches deep where cause Slopes should be stabilized by Slopes of damage is prevalent or potential for continued using proper erosion control erosion is prevalent. measures. Damaged Geo-Textile When fabric is tom,deteriorated,raveled,etc. Fabric replaced as necessary. Fabric. Rock Pad Missing or Soil beneath the pad is visible. Replace or rebuild the rock pad out of place to design standards. Damaged Pipes Any part of the pipe system that is crushed, Pipe repaired or replaced. damage due to corrosion,and/or settlement V-Notch Weir Flow is not being uniformly spread over filter Clean,repair or replace the weir Assemblies media. systems. Below Ground Sediment Sediment depth exceeds 0.25-inches. No sediment deposits on fabric Vault Accumula6on on Geo- layer which would impede Textile/Media. pertneability of the fabric and compost media. Sediment Sediment depth exceeds 6-inches in first chamber. No sediment deposits in vault Accumulation in Vault bottom of first chamber. Trash/Debris Trash and debris accumulated on compost filter Trash and debris removed fi-om Accumulation bed. the compost filter bed. Sediment in Drain When drain pipes,clean-outs,yard drains become Remove the accumulated Pipes/Yard Drains/ full with sediment and/or debris. material from the faalities. Clean-Outs 9/1/98 1998 Surface Water Design Manual A-16 ��:/'7 APPENDIX A MAINTENANCE STANDARDS FOR PRIVATF,LY MAINTAINED DRAINAGE FACILITIES N0. 13-WATER QUALITY FACILITIES (CONTINUED) F.) Leaf Compost Filter(Continued) Maintenance Defect Condition When Maintenance is Needed Results Expected When Component Maintenance is Performed Below Ground Leaf Compost Media Drawdown of water through the leaf compost,takes Replace media with new longer than 12-hours,and/or overflow occ�us compost to specifications,in frequently. addition to replacing fabric. Short Circuiting When seepage occurs along the vault wall and Percolation of water occurs comers occur. along the walls and corners and not through the media section. Media needs to be re-set along the vault wall and comers to form a semi-seal. Plugged/Damaged Fiow tends to backup unusually high in the first Clean out the elbow fittings and/ Elbows chamber of the vault. or replace if damaged. Damaged Geo-Textile Fabric is tom,deteriorated,raveled,etc. Fabric replaced as necessary. Fabric Rock Pad Missing or Soil beneath the pad is visible. Replace or rebuiid the rock pad Out of Place to design standards. Damaged Pipes Any part of the pipes that are crushed,damaged Pipe repaired and/or replaced. due to corrasion and/or settlement. Access Cover Cover cannot be opened,one person cannot open Cover repaired to proper Damaged/Not the cover,corrosion/deformation of cover. working specifica6ons or Working replaced. V-Notch Weir Flow does not spread uniformly over filter media by Clean,repair and/or replace the Assemblies weir section. weir plate secdon,or adjust height. Vault Structure Cracks wider than 1/2-inch and any evidence of soil Vault replaced or repaired to Includes Cracks in particles entering the structure through the cracks, design specifiptions. Wall,Bottom, or maintenance/inspecGon personnel determines Damage to Frame that the vault is not structurally sound. and/or Top Slab Baffles Baffles corroding,cracking warping,and/or showing Repair or replace baffles to signs of failure as determined by maintenance/ speafica6on. inspection person. Access Ladder Ladder is corroded or deteriorated,not functioning Ladder replaced or repaired and Damaged properly,missing rungs,cradcs,and misaligned. meets specifications,and is safe to use as determined by inspection personnel. Cracks wider than 1/2-inch at the joint of any No cracks more than 114-inch inleUouUet pipe or any evidence of soil particles wide at the joint of the inleU entering the vault through the walls. ouUet pipe. 1998 Surface Water Design Manual 9/I/98 ,-'��'� A-17 �(�—�$ APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES N0. 13-WATER QUALITY FACILITIES (CONTINUED) G.) In�itration Ponds Maintenance Defect Condition When Maintenance is Needed Results Expected When Component Maintenance is Performed Infiltration Pond Vegetation Vegetation such as grass and weeds needs to be Vegeta6on should be mowed to mowed when it starts to impede infiltration function. 2-inches in height.Trees and Mowing is generally required when height exceeds bushes should be removed 12 inches. where they impact the infiltrating area of the pond. Sand Filter Layer Sand filter layer has sediment deposits that exceeds Remove sediment and top layer 1/2-inch or the infiltration rate of the sand layer is of sand,and replace in kind per less than 2 in/hr. specification. Sediment Sediment accumulaGons in pond bottom that Removal of sediment from pond Accumulation in exceeds 1/2-inch in depth or percolation test of the bottom. Pond Bottom pond indicates facility is only working at 90%of iYs design percolation rate. Trash and Debris Accumulation that exceeds 1-CF per 1,000-SF of Trash and Debris removed from pond area. Pond• Inlet/Outlet Pipe Inlet/outlet pipe clogged with sediment and/or No dogging or blodcage in the debris material. inlet and outlet piping. Erosion Erosion of the pond's side slope and/or scouring of Slopes should be stabilized by the pond bottom,that exceeds 2-inches,or where using proper erosion conVol potential for continued erosion is prevalent. measures and repair methods. Sediment of Pond Any part of these components that has settled 4- Slopes should be stabilized by Dike/Berm inches or lower than the design elevation,or where using proper erasion control potential for continued erasion is prevalent. measures and repair methods. Rock Window Rock window is clogged with sediment. Window is free of sediment and debris. Overflow Spillway Rock is missing and soil is exposed Replace rocks to specifications. Infiltration VauIV Sediment Tanks:Sediment depth exceeds 6-inches in depth. No sediment deposits in tank Tank Accumula6on in bottom. Vault Trash and Debris Trash and debris accumulated in tank,vault or Trash and debris removed from Accumula6on connecting pipe.Indudes floatables and non- each facility. floatables. Access Cover Cover cannot be opened or removed,especially by Cover repaired or replaced to Damaged/Not one person. proper working specifications or Working replaced. Tank or Vault Tank:Joints between tank sections failing,such that Tank replaced or repaired to Structure Damaged leakage occurs and.or material being washed design specifications. through into facility;or maintenance/inspec6on person determines the tank is not structurally sound. 9/1/98 1998 Surface Water Design Manual a-is /D-�9 APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES NO. 13 -WATER QUALITY FACILITIES (CONTINUED) G.) Infiltration Ponds(Continuea� Maintenance Defect Conditions When Maintenance is Needed Resutts Expected When Component Maintenance is Performed Infiltration VauIV Tank or Vault Structural Vault:Cracks wider than 1/2-inch and any Tank replaced or repaired to Tank Damage evidence of soil particles entering the structure design specifications. through the cracks,or maintenance inspection personnel determines that the vault is not structurally sound. Access Ladder Damaged Ladder is corroded or deteriorated,not Ladder replaced or repaired to functioning properly,missing rungs,has cracks specifications,and is safe to and/or misaligned. use as determined by inspection personnel. � t i ! � I 'i ' f. � . _�i . T;y�� . ' . . . . . .. .. - . .. I. . .. . - . . . I �j �. .� i I I I-I I i � I I 1998 Surface Water Design Manual 9/1/98 . A-19 �O-Z.� APPENDIX A MAiNTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACIUTIES N0. 14-OIL CONTROL FACILITIES A.) OiIJ Water Separators Maintenance Defect Condition When Maintenance is Needed Results Expected When Component Maintenance is Performed. API Type OWS Monitoring Inspection of discharge water for obvious signs Effluent discharge from vault of poor water quality. should be dear with out thick visible sheen. Sediment Accumulation Sediment depth in bottom of vault exceeds 6- No sediment deposits on vault inches in depth. bottom which would impede flow through the vault and separation efficiency. Trash and Debris Trash and debris accumulation in vault,or pipe Trash and debris removed from Accumulation inleU outlet,floatables and non-floatables. vauit,and inleU outlet piping. Oil Accumulation Oil accumulations that exceed 1-inch,at the Extract oil irom vault by surface of the water vactoring.Disposal in accordance with state and local rules and regulations. Damaged Pipes Inlet or ouUet piping damaged or broken and in Pipe repaired or replaced. need of repair. Access Cover Damaged/ Cover cannot be opened,one person cannot Cover repaired to proper Not Working open the cover,corrosioN deformation of cover. working specifications or replaced. Vault Structure Damage- Cracks wider than 1!2-inch and any e�idence of Vault replaced or repaired to InGudes Cracks in Walls soil particles entering the structure through the design specifications. Bottom,Damage to cracks,or maintenance/inspection personnel Frame and!or Top Slab determines that the vault is not structuraliy sound. Baffles Baffles corroding,cracking,warping and/or Repair or replace baffles to showing signs of failure as detertnined by specifications. maintenance/inspection person. Access Ladder Damaged Ladder is corroded or deteriorated,not Ladder replaced or repaired and functioning properly,missing rungs,cradcs,and meets specifications,and is misaligned. safe to use as determined by inspection personnel. Cracks wider than 1/2-inch at the joint of any No cracks more than 1/4-inch inlet/outlet pipe or any evidence of sal partides wide at the joint of the inleU entering the vault through the walls. ouUet pipe. CPS-Type OWS Monitoring Inspection of discharge water for obvious signs Effluent discharge from vault of poor water quality. should be clear with no thick visible sheen_ Sediment Accumulation Sediment depth in bottom of vault exceeds 6- No sediment deposits on vault inches in depth and/or visible signs of sediment bottom and plate media,which on plates. would impede flow through the vault and separation efficiency. Trash and Debris Trash and debris accumulated in vault,or pipe Trash and debris removed from Accumulation inlet/ouUet,floatables and non-floatables. vault,and inieU outlet piping. Oil Accumulation Oil accumulation that exceeds 1-inch at the Extract al from vault by water surface. vactoring methods.Clean ooalescing plates by thoroughly rinsing and flushing.Should be no visible al depth on water. 9/1/98 1998 Surface Water Design Manual A-Zo �0�2 � APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAtNTAINF.D DRAINAGE FACILITIES N0. 14-OIL CONTROL FACILITIES (CONT/NUED) A.) Oill Water Separators(Continued) Maintenance Defect Condition When Maintenance is Needed Resuits Expected When Component Maintenance is Performed Damaged Coalescing Plate media broken,deformed,cracked and/or Replace that portion of inedia Plates showing signs of failure. pack or entire plate pack depending on severity of failure. Damaged Pipes Inlet or outlet piping damaged or broken and in need Pipe repaired and or replaced. of repair. Baffles Baffles corroding,cradcing,warping and!or showing Repair or replace baffles to signs of failure as determined by maintenance/ specifications. inspection person. Vault Structure Cracks wider than 1/2-inch and any evidence of soil Vault replaced or repaired to Damage-Includes particles entering the structure through the cracks, design specifications. Cracks in Walls, or maintenance inspection personnel determines Bottom,Damage to that the vault is not structurally sound. Frame and/or Top Slab Access Ladder Ladder is corroded or deteriorated,not functioning Ladder replaced or repaired and Damaged properly,missing rungs,cracks,and misaligned. meets specifications,and is safe to use as determined by inspection personnel. Cracks wider than 1/2-inch at the joint of any inleU No cracks more than 1/4-inch outlet pipe or any evidence of soil particles entering wide at the joint of the inleV the vault lhrough the walls. outlet pipe. B.) Catch Basin Inserts Maintenance Defect Conditions When Maintenance is Needed Results Expected When Companent Maintenance is Performed Catch Basin Sediment When sediment forms a qp over the insert media of No sediment cap on the insert Accumulation the insert and/or unit. media and iYs 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 I into catch basin. Inspection Inspection of inedia insert is required. Effluent water from media insert I�'I is free of oils and has no visible ', sheen. , Media lnsert-Water Catch basin insert is saturated with water,which no Remove and replace media l Saturated longer has the capacity to absorb. insert Media lnse�t-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 replace media at life of inedia insert product. regular intervals,depending on insert product. 1998 Surface Water Design Manual 9/1/98 A-21 /d Z Z