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C) &otmwater facilities must..provide: <br />1, An.identifiied overflow spillway and downstteam.route sufficiently stabilized to convey :a 100-year <br />critical. storm event; <br />2. Pond outlets designed to:prevent short circuiting of the flow from pond inputs to the outlet; <br />I A minimum depth :for ponds of three (3) feet and. conform to the design specifications of the <br />Stormwater Manual 2005. <br />4..An outlet skimmer to prevent. migration of floatables and oils for the 2-year event; and. <br />5. Access for future maintenance that is free of plantings.and impediments. <br />17) Regional ponds and practices can be used to .providefor stormwater management based on the following <br />criteria: <br />1. Regional. ponds are. required to be designed based on ultimate Conditions for the contributing <br />subwatershed. <br />2-114anal ponds:are required to be constructed and operational prior to constructing imperviousness <br />within.the contributing drainage area. <br />of all Besp, eut Practices..(B s);wiii be ( <br />,.,. �, <br />as amended' and: t1ie=Nfi':CA .G.ei�ezai ermit for C. <br />F} Wheu;;using uxfiltration for l a ce control tnfil " fiiort volumes, and facility'sizes sliall be Mculated using <br />^il p._ 1, f, tratiri the <br />the..a a= riate :yd olo�al soil g oup clas. & tion ad infiltratibrira e;=an `s£ "all be capable ofinfd g <br />e al Crmtt for.Consttu <br />require ;alum `=ut�ain7Z 3i`aurs or: as spec�fted:in the'GA.G ez cti n_Activities. <br />w•t. <br />�"+-g <br />c. inEiltratabri''ca a :,of a cox�strueted BME ;under ost-develo rriezx E.`:: cariditions the <br />G)eyaluatlii 5 =''tlz ,,.p 41ty> _ p 1? ::,;.,, <br />Itflltsation rate in`the Minneso Sfo water Manual slbe used. Select the design infiltration based on <br />the least permeable soil horizon within the first five (5) feet below the bottom elevation .of the proposed <br />inflttatiot facility... Site-specific.infiltration measurements completed by a licensedprofessional (as described in <br />the Minnesota S.tormwatex Manual, November 2005, and as amended) may be used in place. of the values in <br />the Minnesota Stormwater Manual, and as approved by thc.City. <br />H) All stormwater retention practices .designed to 'meet the volume control regulation must provide <br />Pretreatment of stormwater nmoff prior to infiltrating into the groundwater system or :discharging downstream. <br />Pretreatment.methods must comply with the Minnesota Stormwater Manual, 2005, and as amended, for the <br />proposed practice. All hlgbly recommended and recommended. design. criteria. nustbe met, unless specifically <br />waived by the Technical Commission of VLAWMO or .the.Rarimsey=Waslungton.Metro Watershed District <br />(RWMWB),:as appropriate. <br />1) To the maximum extent practicable, volume control shall. b:e. fully met onsite (Section 2, Subsection 2b).. Site <br />conditions.may make,infiltration undesirable or impossible. The applicant:imuwmake soil. corrections and/or <br />investigate other locations on.the site.fox feasible infiltration locations. Infiltration practices.are not allowed: <br />1. Fox runoff frorn:fueling and vehicle maintenance areas; <br />2. Within hydrologic.soil.group D type soils; <br />.3, Within some Wellhead. Protection Areas (Review Wellhead Protection flans for additional.. <br />guidance);. <br />4.. Within 50 feetof a septic: tankor drain field; <br />ir7pdated.Iune.5, 2017 Gem Lake Consolidated Land Use Ordinance —Page 114 <br />