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Emeranencv overflow swales or areas shall be constructed to convey
<br />the peal. 100 -year discharge from each water body to the next
<br />downstream water bode and away from buildinas.
<br />S. Minimum Protection for Rivers, Lakes and Wetlands - Rivers,
<br />streams, lakes, and wetlands shall be protected from runoff generated
<br />during construction and after completion of the development. Runoff
<br />shall not be discharged directly into wetlands without appropriate quality
<br />and quantity runoff control, depending on the individual wetland's
<br />vegetation. Wetlands must not be drained or filled, wholly or partially,
<br />unless replaced by either restoring or creating wetland areas of at least
<br />equal public value. Compensation, including the replacement ratio and
<br />quality of replacement should be consistent with the requirements
<br />outlined in the Board of Water and Soil Resources rules that implement
<br />the Minnesota Wetland Conservation Act 1991 including any and all
<br />amendments to it.
<br />a. Buffer protection for Rivers, Streams, Lakes, and Wetlands — A
<br />minimum 40 -foot buffer strip around wetlands, and a 100 -foot buffer
<br />along streams, rivers, lakes, and special waters identified in the
<br />NPDES construction permit shall be maintained at all times using
<br />native vegetation. Buffer width shall be increased by at least two feet
<br />for every one percent of slope for the surrounding land along rivers,
<br />streams, and lakes and four feet for every one percent slope for
<br />wetlands. The?ity may allow buffer area averaging in cases where
<br />averaging will provide additional protection to either the resource or
<br />environmentally valuable adjacent upland habitat, provided that the
<br />resources total buffer area remains the same. Care should be taken in
<br />averaging so that the buffers usefulness is not short circuited. Detailed
<br />buffer design is site specific, and therefore, the ptv can require a
<br />larger buffer than the minimum specified. The applicant shall
<br />maintain the buffer for the first year after completion of the project.
<br />Drain tiles will short circuit the benefits of buffers - Therefore, drain
<br />tiles on the project site shall be identified and rendered inoperable,.
<br />C. Stormwater and Urban Runoff Pollution Control
<br />1. Illegal Disposal
<br />a. No person shall throw, deposit, place, leave, maintain, or keep or
<br />permit to be thrown, placed, left, maintained or kept, any refuse,
<br />rubbish, garbage, or any other discarded or abandoned objects, articles,
<br />or accumulations, in or upon any street, alley, sidewalk, storm drain,
<br />inlet, catch basin conduit or drainage structure, business place, or upon
<br />any public or private plot of land in C, itv, so that the same might be or
<br />become a pollutant, except in containers, recycling bags, or other
<br />lawfully established waste disposal facility.
<br />b. No person shall intentionally dispose of grass, leaves, dirt, or other
<br />landscape debris into a water resource buffer, street, road, alley, catch
<br />basin, culvert, curb, gutter, inlet, ditch, natural watercourse, flood
<br />Model Stortnwater Ordinance
<br />[Deleted: community
<br />:Deleted: community
<br />Deleted: U
<br /><# >Special Waters Regnirenents1
<br />< #>Tlcre shall be no increase in either
<br />the volume or rate of stormwatcr runoff
<br />for the one and two year 24 -hour storm
<br />event including trout streams1
<br />< #>If the soil is not suitable for
<br />stonnwater infiltration and/or
<br />evaporation/transpiration techniques
<br />(soils with permeability values less that
<br />USG C soils (less than 2.5 inches per
<br />hour) as defined by the Natural Resources
<br />Conservation Service), rite community
<br />may require reduced volume contrail/
<br />< #>The permanent storm water
<br />management system must be designed
<br />such that the discharge from the project
<br />will minimize any increase in the
<br />temperature of trout stream receiving
<br />waters resulting from the 1, and 2 -year
<br />24 -hour precipitation events. This
<br />includes all tributaries of designated trout
<br />streams within the section that the trout
<br />stream is located Projects that discharge
<br />to trout streams must minimize the
<br />impact using one or more of the
<br />following measures, in order of
<br />preference:1j
<br />< #>Minintize new impervious sorfaces.1
<br /><#> Minimize the discharge from
<br />connected impervious surfaces by
<br />discharging to vegetated areas, or grass
<br />swales, and through the use of other non -
<br />sinmlural controls.1
<br /><# >Infiltralion or evapotranspiration of
<br />runoff in excess of pre - project conditions
<br />(up to the 2 -year 24 -hour precipitation
<br />evmrt)AJ
<br />< #>If pending is used, the design must
<br />include an appropriate combination of
<br />measures such as shading, filtered bottom
<br />withdrawal, vegetated Swale discharges
<br />or constructed wetland treatment cells
<br />that will limit temperature increases. The
<br />pond should be designed to draw down in
<br />24 hours or less.¶
<br />< #>Othcr methods that will minimize any
<br />increase in the temperature of the trout
<br />stream.¶
<br /><#>If the proposed project site includes a
<br />• special water tributary that currently
<br />experiences erosion and/or sedimentation
<br />problems, the applicant must wor a
<br />• Deleted: < #>Regionnl Pending - The
<br />local authority may establish off-site
<br />stormwatcr management and associated
<br />fees, provided that provisions are made to
<br />manage stonnwater by an off -site facility,
<br />and provided that all of the following
<br />conditions for the off -site facility are met:¶
<br />< #>The facility is in place;¶
<br /><#>The facility is designed and
<br />adequately sized to provide a level of
<br />stonnwater control that at least meets the
<br />ordinance standardsll
<br />< #>nse local approval authority i
<br />l Deleted: community
<br />Page 11 NEMO Ordinance Project
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