Laserfiche WebLink
Conservation commission <br /> September 21 , 1989 <br /> Page 5. <br /> Ms Behrman asked if they were going to construct a drainage trench along the <br /> inside edge? <br /> . McGrath stated the existing elevation is at 3.7' along the entire length; <br /> there is very little depth to ground water. They did look at trying to put <br /> some sort of drainage system but it was impossible. <br /> Ms Behrman suggested flow diffusers in the yards to the south. Mr. McGrath <br /> stated they would be in the ground water. <br /> Mr. Coffey asked how many residents there are and how many trips. <br /> Mr, McGrath advised there are 17 houses; 17 vehicle trips per day. The width <br /> of the road is shown at 11 ft, <br /> Ms Behrman asked how deep the water pipewill be going' i hwood Dater spec- <br /> ifications <br /> pecifications show it down at 5 ft. She asked if they will be dewatering and is <br /> that in? <br /> Mr,. Mc rath advised a l l the houses are served now by private wells. <br /> Mr. Rosenberg asked if they were planning a berm on the south side of the road <br /> to direct the water to the other side. Mr. McGrath advised they plan to have <br /> a bituminous concrete waterway there, at three points, directly discharging into <br /> the salt marsh. <br /> Mr. Rosenberg read from the project description, "A berm will be constructed at <br /> the project edge to contain run-off. Drainage will be improved by the use of a <br /> recharge area, leaching catch basins and waterways". <br /> {fir. McGrath stated there are berms to contain the edges and protect the edges b <br /> slightly greater thickness at the edge; it will contain the run-off. <br /> Ms Behrman added, until they get to the waterways and thea there will be <br /> concentrated snot. Mr. McGrath agreed, that is absolutely correct. <br /> Mr. Coffey asked if there were natural gullies doing the sane thing there row? <br /> Mr.. c Grath advised the road floods and then overtops the shoulder. There are <br /> no berms there now. He located the catch basins on the displayed plan. From <br /> the edge of the catch basin to the salt marsh is 35 feet. <br /> Mr. Rosenberg stated, in the areas of the three waterways,, a crown in the riddle <br /> of the road and even drainage off on both sides would lessen possible erosion, <br /> M <br /> Mr. McGrath stated it is not going to take munch of a storm to have it flow into <br /> the marsh, no matter what, but he could revise the plan to show that and take off <br /> the waterways. <br /> Mr. Sherman suggested an environmental assessment might be wise and requested <br /> a copy of the plan shown tonight. Mr. McGrath agreed to provide a plan. <br /> Ms Behrman stated dewatering is not in the Notice of latent. She would like to <br /> know how and where the water will be pumped, if they are going to do i t. She <br /> asked i f it will be done with a Bobcat and was told a Backhoe crust be used. she <br /> further asked what will be put down the edge of the road to ensure no farther <br /> encroachment on the salt marsh. <br /> Mr. McGrath started a temporary sediment fence is shown, 28" high, burried i n. <br />