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08/25/2021 EB Packet
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08/25/2021 EB Packet
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9/24/2021 3:35:44 PM
Creation date
8/20/2021 2:15:26 PM
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Environmental Board
Env Bd Document Type
Env Bd Packet
Meeting Date
08/25/2021
Env Bd Meeting Type
Regular
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Wetland D is classified as a preserve due to high value amphibian habitat and vegetative <br />diversity. <br />Storm Water Management, Erosion and Sediment Control <br />Per the stormwater management plan, this development will involve disturbance of <br />approximately 5 acres, and will add 2.22 acres of impervious area. The City requires no <br />increase in peak flow rates for 2-, 10-, and 100- year rain events. The conditions as <br />proposed indicate runoff rates will be held steady or reduced for the three categories of <br />rain events. <br />Stormwater runoff currently enters Amelia Lake at four locations. The proposed plan <br />includes conveyance of runoff to stormwater treatment basins planted with native <br />vegetation. More specifically, there will be eight biofiltration basins (raingardens) with <br />underdrains. Post -treatment stormwater will enter Amelia Lake in the same four general <br />locations as it does currently. <br />Infiltration was not deemed feasible for this site, based on presence of clay in soil <br />borings, and because the site is within the Drinking Water Supply Management Area <br />(DWSMA). <br />A stormwater pollution prevention plan (SWPPP) will have to be submitted. The project <br />will also require an NPDES permit. <br />Drinking Water Protection <br />The site is within the Drinking Water Supply Management Area (DWSMA), with the <br />northeast of the site classified as highly vulnerable, and the southwest classified as <br />moderately vulnerable. This will impact the feasibility of stormwater infiltration on the <br />site. The stormwater management plan does not propose infiltration. <br />The proposed lots will have septic systems and private wells because city water and <br />sewer do not currently reach this site. <br />Flood Plain <br />Portions of the site near Amelia Lake fall within FEMA flood plain. <br />Shoreland District <br />Site falls within the Shoreland Management Overlay. The section of ordinance pertaining <br />to shoreland district has the general purpose of protecting public waters. Alterations of <br />vegetation and topography in the Shoreland Overlay District will be regulated to prevent <br />erosion into public waters, fix nutrients, preserve shoreland aesthetics, preserve historic <br />values, prevent bank slumping, and protect fish and wildlife habitat (City ordinance Ch. <br />1102.09). The regulations prohibit clear cutting of vegetation and allow limited clearing <br />3 <br />
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