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� at <br />c`.1 se4r-Plz "*°.. <br />f1 <br />'Pg <br />_ f <br />au <br />Icor <br />$ I N NC$ <br />so nor x Fors <br />2 r • " 9038 <br />t Lim ,,,i <br />NC Ar5A <br />tar <br />Outlet A <br />1 <br />I %' ..d= ,ter <br />sj � &N11 \ /I <br />,.a4`!r i .eaf' i ss3 \ as1 I / 1 <br />0' ,ks 1 / wet <br />• r «r :,. N.Y, • <br />,ga <br />,nf <br />,wd <br />ItSK <br />*.1 <br />1 <br />...a` <br />1 <br />S <br />J <br />t <br />/ 4 . <br />I <br />r <br />1 <br />I <br />r <br />60 <br />r <br />I <br />I <br />W E <br />s <br />A <br />0 <br />50 <br />Salo : 1 loch - 50 loot <br />100 <br />5, <br />der TO OWL <br />wrAm awe VIM sAtYM@ San <br />rte.... .,. .' <br />mlc.� YYR <br />AVM Il Die Orifice <br />PO*0 90110u <br />imp/ FO0101411- <br />77- miaow ICIO, <br />a YIrY/ aPOI <br />RECEIVED <br />JUL 1 9 i9S9 <br />CITY OF LINO LAKES <br />Drainage Summary <br />Area Tributary to Pond - 4.9 acre <br />Existing 1 year Peak 0.2x1.8x49 =1.7 cfs <br />Existing 100 year Peak 0.2x4.8x4.9 =4.7 cfs <br />Proposed 1 year Peak = 0.1 cfs <br />Proposed 100 year Peak = 28 cfs <br />Velocity through heir • 1 ear peek <0.5fps <br />2.5" Rainfall runoff (C =0.5) = 21,400 CF <br />Sediment Storage = 31,800 CF <br />Implementation Schedule: <br />1) Instal M1 Stop Ferree around downstream <br />perimeter of planned work site <br />2) Construct storm water treatment pond and <br />weir outlet system concurrently with rough grading <br />3) Proceed with construction of grading <br />4) Seed and mulch disturbed green areas within 14 days <br />5) ga retain end repair erosion control features until <br />permanent vegetation le established <br />Note: Seeding snail be No/DOT mix 500 w /mulch <br />constructed in accordance with Mn/DOT 2575 Specs <br />Note: Install Mn/DOT SW Plate 3133 Rip rap <br />at all Storm Sewer outlets <br />© R. Nelson Engineering <br />1998 <br />S <br />.stir► <br />Jain Now carats <br />t <br />stay w..nrYsse <br />. UMW COMM %Yr ..Y .lit wa ..Iona .r .e: oa =oat ter <br />rr1CT SUSISSASON AD NY . ON A OILY orate m PISYCi9 NYL <br />MOM= wets Tie INC Or wK IRAE O/ unCIPAA <br />OAe_Ano a asr <br />ooYearnou / 1431111 <br />R. Nelson Engineering <br />1628 Highway / 10 NE, Spring Lake Park, UN 55432, (612) 784 -7390 <br />Prepared for: North Suburban Development, Inc. <br />Highland Meadows East <br />Grading & Drainage Plan <br />• <br />• <br />• <br />Sheet <br />x1 <br />