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},3 RuepfTIffies may be restricled to Iesm Iht na the exisrtng rates whenas deemed ed nc-ganby 'ir <br />staff for the protection of public heaitty safe and encral welfare.. <br />2_Volume Control. Protean where the sum of the new unperyious surface and the rid Iy reconstructed <br />iniyervious surface equals one or more acres must control Vol time onsite ' <br />rs4ention . The following volume control standards anpi% <br />1. Non -linear proitets shall Treat ]-]-inch of runoff from the sum of Ilic new and the fully <br />teconslwed impervious surfaces <br />? Linear projects shall treat the larger oftlx followarse: <br />aa0.55-inch of mnoff from the sun ofthe ne" and the fullyreconstructedunper%inus <br />surfaces; or <br />bbl.1-inchofrunoff from the nel inlrease rn imperyiousstifaoes. <br />Vol Kntrr+nanslanedrltiColl t I,e trued ins coin fol brk <br />3. Water Quality. Slormwater management must comply with the requirements of the Minnesota Pollution <br />Control Apency's NPDLS SD9 C'onstriii: Moral Peraut MNR100001 (C SW Permlll <br />reOnlrEmegLAk' � *,h-.w... and guidelines set forth in relevant <br />total maximum daily load studies and : - sheer IMal . statL. and'or federal <br />regulations. No direct {untreated} discharges of gormwater to natural or improved t+aterbodies are allowed. <br />4. Waste Disposal to Waters. Stormwater management must not result in the discharge of any regulated <br />substance, hazardous or biological waste, or petroleum product, whether treated or untreated, to best <br />management practice devices that may have a deleterious effect upon water of the state (surface and <br />groundwaler) 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 />-�--A <br />rrt, c data shall be cusp€ercd Lim rig NRC ', moth MOIQgy. i.e. <br />IlvdroCAD orTR2UTR55_ XP-SWMM or a comlmrabic-, C iiv aapD mid rnci1A. hydraulic calculations <br />will be aocepled in the rational method format or in commonly used wit«src achar[es such as F'HWA 11Y- <br />8. or XP-SWMM or ions shall be <br />submitted to the City as oulined in this section with additional detaii provided upon request. <br />7 Water quality calculations will be accepwd Gum cnmmorlly used software pa_�ges such,%%MUB <br />calculator. PH Iwith a standard NUR 5011 P percentile particle size dictribut ion l. or a <br />g_O.:IIa,4 131E 01nparable,City appmyed method. <br />3. 1.mil .unIII sewer systems shall be designed for the IDS ear storm Event. The Rational Method shrill be the <br />preferred methodology rot Ilie design ❑floral systems Culvert crossings -or stonn-systems in County or <br />State ryWTI -of-way may have a design fn ucncy wluch differs from the C:iny's 10-year design storm- The <br />designer shall contact each agency unit of ko%tnunmg to determine the aourou fate desims frequency for <br />hvdrninglcally cnnrlecled systems. <br />■ <br />4. lem% dissipation shall be pnsvided ai culvert and storm sewer outfalls in accordance with the Minnesola <br />Deparlmeut of'fran'portalion I)rainage Manual If stable vegetation Ls aca;eptable, temporary erosion <br />contnrl durtnr: and nnneedr:ucly Lul lmmg comlrue[ ion _stealI be tier( unlit �e etatinn tsecrnnes established <br />— --- . <br />S 1ligh water elevationg. for landlocked areas basins where mo outlet exists I shall be established , first <br />estimatimy the normal or initial to ter surface elevation at the bertimimc of a rainfall or runoff event using a <br />doewnenwd "Wer budget, evidence of mottled soil, and or an established ordinary high wale;level . The <br />U1xlaird Aeesryrrl 17, 201N Gem Lake Co isolydoredLand Use Otdiirance No. 131 — Page 109 <br />Formatted: Font (Default) Times New Roman, 10 pt <br />Formatted: Font. (Default) Times New Roman 10 pr <br />Formatted. Indent Left 0-5', Line spacing: Multiple <br />1 D8 li, No bullets or numbering <br />Formatted: Font (Default) Times New Roman: 10 pt <br />Formatted. Font (Default) Times New Roman, 10 pt j <br />Highl' ight— J <br />Formatted: Normal, No bullets or numbering <br />Formatted: Font (Default) Times New Roman, 10 pt 1 <br />Formatted: Normal Jl <br />l .. <br />LFormatted: Font: (Default) Times New Roman, 10 pt <br />Formatted: <br />ortted: Line spacing: Multiple 1.08 li <br />Formatted: Font (Default) Times New Roman <br />Formatted: List Paragraph J <br />r— <br />�Formatted: Rrrt: Pfau l} --ryes Nc a Roman, Bold <br />Formatted: -art (Default) Times New Raman <br />Formatted: Font: (Default) Times New Roman, Bald <br />Formatted: ; ort p;ctau ti - lmcs New kaman - <br />Formatted: Font (Default) Times New Roman <br />