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3 3 KRUNCH Storage, Joe Huth <br />Gem Lake, Minnesota <br /> <br />Introduction: <br /> <br />The proposed development involves a small commercial building and associated outdoor storage area for <br />KRUNCH Recycling and Disposal, a dumpster-rental service provider, located in the City of Gem Lake, <br />Minnesota. Site work will include utility service connections to the building, site grading, and construction <br />of a small storm-water basin designed to reduce runoff rates. <br />Stormwater Requirements <br /> <br />The City of Gem Lake has review jurisdiction over stormwater runoff from the proposed development. <br /> <br />City of Gem Lake <br />The City of Gem Lake requires on-site volume control for developments where new impervious surface <br />areas total one acre or more, a threshold our site does not exceed. Additionally, the City mandates that <br />post-construction storm-water runoff rates for the 2-, 10-, and 100-year critical-duration storm events must <br />not exceed the pre-development rates. Finally, all on-site storm-water conveyance channels must be <br />designed and constructed to accommodate the expected flow velocity of a 10-year frequency storm <br />without causing erosion. <br />Existing Conditions <br /> <br />The subject property is approximately 0.68 acres of land that primarily consists of a gravel parking area <br />enclosed by chain-link fence. On the south side of the site there is a small depression / ditch that was <br />studied by Earth Science Associates Inc. and identified as an incidental wetland. The Minnesota DNR <br />concurred that the feature is not regulated under the Wetland Conservation Act. Additional vegetation on <br />site includes scattered trees and scrub growth. <br />The existing water drainage currently flows across the site north to south. About a quarter of the site drains <br />to the east and three quarters drains to a flared end storm inlet in the southwest corner. <br />The site soils are mainly made up of fill that is composed of silty sand, clayey sand and poorly graded sand <br />with silt corresponding to the ASTM classifications of SM, SC and SP-SM. These soils will generally be <br />Type C soils under Department of Labor Occupational Safety and Health Administration <br />(OSHA) guidelines. <br /> <br />Refer to Appendix A and D for additional information. <br /> <br /> <br /> <br />