10/12/1995 CONSERVATION COMMISSION Minutes

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MASHPEE CONSERVATION COMMISSION minutes 12 October 1995 Commissioners present- John Fitzsimmons , Elliot F s nr �s David Sharpe ? Ralph Shaw , Karry Derr s i er s , George Green Jr . Representing P.A. sanders for the Great Oak Road project were Greg Keelan . Norman Hayes and Renwick Chapman of BSC Group , and Greg Tay 1 r v Mashpee DPW Director . The meeting was called to order by the Chairman at 7 :00 p .m . Mr . Chapman advised he had been asked to respond to the concerns of theCommission regarding drainage on Great Oak Road . Drawings highlighted n �� r r cpm the plans . He and Mr . Hayes walked the area yesterday and spent time determining the best way to address concerns . Because there are no contours on the plans , hey measured distances to high Points and Crests in the hills . The low point , station 41 , heading north is 800 feet to the high po: nt at the crest . They are proposing a standard desi n approach to minimize and reduce the amount of water com' nq to the spot and prevent the washout fr m happening as before . The road comes down a steep grade low point at station 41 and back up and around a 3-4% grade at somewhere around Station 43+50 , possibly as far as 44 and then changes and goes back downhill to another low spot that will be addressed later on . It is proposed to interceptthe water from the high point y coming up and Putting i n a series of basins in around the basins currently installed a h low p i n , go 200 fee. northerly to around station 39 , install another two catch basins and continue on uphill to around station 36 with another pair of catch basins . That will take thewater from the high Point at around 34 and pick up the drainage from the gutter and carry it to an equalizer pipe across to the two leaching pits . Because of the cut on the side of the road on the westerly side , he put an equalizer pipe for overflow whenever capacity is exceeded . It will go into h rock trap area . Catch basins are designed -dor the ten year storm eve n . . Some times storms wit teed volume for the leach piis By doing his , it will minimize the water and ponding in the low point of the road and probably overtopping th berm . Along the grades , hey will put a cape Cod berm , a " rise . Overflow w'11 g n a 51 ' area surface ace st ne , a rap rock area . Mr . Rosenberg asked if there is a concrete drainage grate shown a he edge of thewetlands? s this the same spot where here is the emergency over r . Chapman advised