Laserfiche WebLink
I3 Runoff rates nM be re_tricted to less than the ng, rates„ 4wnas deemed necessary Gy C qi <br />staff for the protection ofpublic health, safely and gcncml wclfane. <br />Volume Control. Projects where the sumol'the,new,unir ions -surface and the mint} mcnnsiructe_d <br />impervious surface eeluals one or more acres must control volume onstic <br />-, eMiE3m_ The following, s olunx confrul standards annit <br />1. Non -linear uroiects shlsll Ireat 1.1-inch of runoff from ?he s_utlof the new and the ftdly <br />reconstructed impervious surface <br />2 Linear pro ects shall treat the larger ofthe following. <br />a,_0.55-inch of runoff' from the sum of the new and the fully reconstructed impervious <br />surfaces; or <br />h L1-inch.of runoff Tram the net tturcase in tnr rvious surfaces. <br />.'... - izelun,,-.....Pal efe.i:.,...a L.....rJ !@eentf.J up to e e hWF(Q 5) ineli-orn HtafrdeSe.:hed .....ire *TT. ce,.....- 12�r; <br />3. Water Quality. Stormwater management must con0y with the requirements ofthe Minnesota Pollution <br />Control Ageno) s NPIA: S'VS ('owliucttun Stormwater General Permit MNR1000J1 IC SW Pero} <br />requirement and guidelines set forth in relevant <br />Iota] maximum daily load studies andal, slate, and or fedcraf <br />regulanons. No direct (untreated) discharges of stomtwater to natural or improved waterbodies are allowed. <br />4. Waste Disposal to Waters. Stormwater management must not result in the discharge ofany regulated <br />subslance, hazardous at biological waste, or petroleum prod ucl, whether treated or untreated, to best <br />management practice devices that may have a deleterious effect upon water of the state (surface and <br />groundwater), unless the discharge is in compliance with Federal, State and local regulations. <br />3. Criteria. Stormwater management plans shall comply with the following criteria: <br />^n-"" --' -' .11 hFdr_nioyic data qlal I he oumpletud using,NRCS methodoln};}'; i c. <br />Hyd naC AD or TR20:7R55. XP-SWMM or compMble,:,City mmoved method Hydra uitc calculations <br />will be accerAed in the rational tnethod format or in commonly used soft Ware PNkagcs such as F1lWA 1IY- <br />8 or XP-SWMM or a co nn)arabh:&wfTaWbW City approved method. I hest computations shall be <br />submitted to the C rty as outlined in this section with additional delaiI rrnvtdcd upon reouest. <br />I <br />2 Waler quality calculations will be acre Wd fnmt conurtcm] y used software acka s such as MI1]S <br />calculatot. P8 with a standard NURP 5tlih percentilcparticle see distribution;, or a <br />e%twg-ftlrlecorriparAble, C by aaMoved method. <br />Formatted. Font: (Default) Times New Roman, 10 pt___ <br />Formatted: Font (Default) Times New Roman, 1 Q pt <br />�Formatted: Indent Left 0.5', Line spacing: Multiple <br />1.08 1i, No bullets or numbering <br />Formatted: Font (Default) Times New Roman, 70pt <br />Formatted: Font (Default) Imes New Rumen, 10 pt <br />Highlight <br />Formatted: Normal, No bullets or numbering <br />l Formatted: Font: (Default) Times New Roman, 10 pt <br />Formatted: Normal <br />Formatted: Font (Default) TimeS New Roman; 10 pt <br />Formatted: Line spacing: Multple 1.08 li <br />3. Local storn sewer !�r. stems shall be designed f lit- year storm evcni The Rational Metf sl II be Qte • Formatted, Font. (Default) Times New Roman <br />pir;fencd utcthudulul v for the _design oftocaI systems Culvert crossings or storm slstetns in Cnunly or _- - <br />Stale right -ol_way_ma4 have a desir:n frequency which diMers fiom the CitS''d I0-veat destym storm. The Formatted: List Paragraph <br />designer shalt contact each a enc . unit ofgovetrtinenl to delemtinc the appropriate design frequency for <br />hydrologtcally-connected systems <br />3. I`ne *v disci lion shall he tuvided Hi culvert and storm sewer okilfalk in accordance with the Minnesota Formatted: Font: (Default) Times New Roman, Bold--"�— Department of Trans nation Dran ,e Manual If cable ve ,elation is acce able wTnmirary erosion Formatted_Font (Default) Times New Roman <br />control dnrinjLaEtd !inniedtately follogtngccmuruction dial] be used until mucta ion_beconies estahl_idwd_. <br />Formatted: Font. (Default) Times New Roman, Bold <br />S, �1igh wale elevations for landlocked areas (twins where no ouIlet existsI shall he egablishod by first <br />cstlmatin -, the normal or initial water surl'ace elevation at the hegi mu ng o f a ramfall or mnoITevent usin! a formatted: Font (Default) Times New Roman <br />documented water budget, evidence ofmultled soil. arkioraft estahlished nrdinan hi =h-water level. The Formatted: Font (Default) limes New Roman <br />QpdaredArrgrnr 17, 2018 Gem Lake (,mvalidai&iLard (Ise OrdimtneeNa 131-Page 109 <br />