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MINNEHAHA CREEK QUALITY OF WATER �lectronic Copy WATERSHED DISTRICT QUALITY OF LIFE January 9`h, 2017 Pre Application Summarv: 2500/2520 Shadvwood Road. Orono Attendees: Tom Goodrum, Westwood; Heidi Quinn, MCWD; Katherine Sylvia, MCWD; Renae Clark, MCWD Meeting Date: December 29`", 2016 Current site sketch proposal: • New 45-50 unit apartment building with underground parking and parking lot at 2520 along with parking lot expansion at 2500 Permit Pre-App review: • Rules Triggered: Erosion Control, Wetland Protection, and Stormwater Management Stormwater Manaeement: Table 4: Site Size <1 acre >1 acre • Size of site in aggregate: 7.71 acres • Existing impervious surface: 1.88 ac —1.89 ac (based on 2015/2016 applications) • Proposed impervious: unknown • Assuming less than 40% of the site is disiurbed (less than 3 acres), the proposed increase in impervious surface will determine if the new impervious surface or entire site need to be treated. • Required volume standards are calculated by abstraction of the first 1" of rainfall from the impervious surface. Phosphorus standards are assumed to be fulfilled by abstracting the first 1" (volume requirement�. The rate control standards are met by showing there is no net increase in peak runoff for the 1, 10, & 100 year storm event. • Below is a table that summarizes the stormwater rule for an increase in impervious: <40% site disturbance >_ 40�o site disiurbance < SO% increase in impervious surface >_ 50% increase in impervious surface in an BMPs Phosphorus Control, Rate Control, and Volume Control Phosphorus Control, Rate Control, and Volume Control .' � 1 , in impervious surface Treatment Additional impervious surface Entire site's impervious Entire site's impervious JAiti! ' , .,E , ` CITY OF ORONO