6.6. SR 09-16-2002 - Laserfiche WebLink

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CONSULTING ENGINEERS SINCE 1944 August 27, 2002 ULTEIG ENGINEERS, INC. 52Cl EAST RIVER RQAD.$UITE a0~ PHONE: 76:3-571.2~00 MINNEAPOLIS. MN 55421 FAX; T63-~71-1166 WEB SITE: www,ult~Jg.com OTHER OFFICES: FARGO, ND BISMARCK, ND SIOUX FALLS, SD Ms. Michele McPherson Director of Planning City of Elk River 13065 Orono Parkway Elk River, MN 55330 RE: Site Review Cmzunents fi.om Howard R. Green Company for Elk River Town Off'ices Dear Ms. McPherson, This letter is to address the commcms from the cit7 of Elk River's consulting engineer Howard R. Green Company dated August 20, 2002 for proposed town o~ces on Lot 2, Block I and Lot I, Block 2, Mulvaney Pt. The responses are numbered in reference to the comments received with a brief statement of the comment before the response: Paved and green areas behind buildings, 1 and 2 drain directly to Tyler Street. A storm sewer with catch basins and inline drains with down spout adapters mmai~g to the pond to intercept surface and roof runoff fi:om draining to Tyler Street was mistakenly turned offin the drawing. This will be included in the final plans. 2. The area behind units 6 and 7 a££ears to have omitted the 908 contour. The 908 contour has been added belfind units 5-8 in Block 1. The storm sewer should pick up drainage from the roof and landscape area around units 4-9. In the current undeveloped state, there is approx. 82,035 SF draining from and through our site. Most of this drainage will be diverted to the pond for the developed condition. Posx-developed area drainage from the area in question is approx, t 8,265 SF. Thc proposed runoff is from green grass and rooftops. Sedimcnt and nutrients runoffrate~ will not increase. There were no z'torm drainage calculations provided with this submittal package. Design calculations for the pond will be provided. One pond was chosen for both siren to maximize build able area for Lot l-Block 2. Storm sewer sine and grate size and quarCdty will also be provided. The pond dom' not show an emergency overflow elevation. The pond appears ro have 3:1 side slopes; flatter slopes are required above the water level, including a bench. All emergency overflow elevation will be shown for the pond. Creating a more gradual side slope is limited by the amount of area available. In addition, a safety bench with 10:1 slope under thc normal waterline will be clarified. Sanitary sewer and water service are provided frown the public utilities under Third Streer. The water system on Lotl, Block 2 needs ro be looped, Drainage and utility easements will be required over the z'anitary sewer and water for tnainlenancepurposes. Th~ proposed sanitary sewer is to be connected into the existing nmahole between unit~ 8 and 9 of BIock 2. The walkout units in Block I are too low to connect ro the existing sanitary service stubs at Third street. The water in Lotl, Block 2 will be looped and thc connections to the existing stubs will he clarilled. Drainage and utility easements are shown on the preliminary plat and cover all common areas. EQUAL OPPORTUNrTYEMPLOYER