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full. tt is proposed to install environmental sump manholes at the culvert, <br />junctions. <br /> <br />The Lower Rum River Watershed Management Organization will require storm <br />water runoff from the subdivision and other contributing areas to 'be pre-treated <br />prior to discharging to the adjacent wetland and eventually to the Rum River. To <br />achieve the water quality goals for the contributing area, storm Water will be <br />routed to a proposed detention basin to be located on the rear of one lot south of <br />152nd Ave. <br /> <br />In addition, to. pick up the drainage from the Brandseth Subdivision to the north, it <br />is proposed to install a 12" storm sewer and catch basin north of 152nd Ave. as <br />shown on EXHIBIT A. <br /> <br />A large portion of the storm runoff from the adjacent "Helium Street Extension <br />Project, C.O.R. Project No. 02-20" is proposed to be discharged to the new <br />detention basin being built in this project. The storm drain culverts and detention <br />basin volume were increased in size to handle this additional runoff. Therefore, it <br />is proposed that 50% of the cost of the storm drainage and easements between <br />the detention basin and the Helium St. project be allocated to be used in <br />negotiations for right-of-way across those benefited properties. . <br /> <br />See "EXHIBIT A" for detailed description of the proposed street and storm <br />drainage improvements~ <br /> <br />B. Water System. <br /> <br />The proposed water system improvements will provide a minimum 8" water main <br />with an 8" stub out in the western end of 152nd Ave. to allow the inter-connection <br />to the water system provided in the other two project areas discussed earlier. All <br />mains will be DIP. Fire hydrant spacing will be approximately 300 to 400 feet. <br />One-inch service connections will be provided for all existing developed lots. <br />Where the adjoinin9 property is undeveloped, one-inch services will be provided <br />at 85 foot intervals. <br /> <br />See "EXHIBIT B" for detailed description of the proposed water system <br />improvements. .. <br /> <br />C. Sanitary Sewer System <br /> <br />All proposed sanitary sewer lines will be 8" PVC pipe with manhole spacing at <br />400-feet maximum. The depth of the' sanitary sewers will be between-10 to 12 <br />feet except where more depth is required to connect to existing sewers or where <br />the deeper lines would be more cost effective. <br /> <br />i <br />I <br />I <br />I <br />! <br />! <br />I <br />! <br />I <br /> <br /> Page 5 <br />~'~88-- G:\Muni¢ipaI~AFLAMS E'r'\633\RA633F S R.doc <br /> <br /> <br />