1/4/1984 CONSERVATION COMMISSION Minutes

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i i Minutes of Conservation Commission January , 1984 Page 6 that vegetation survives very well behind these walls. harlie asked what they would be doing to the area above the wall on the sloped Mr. joy replied that they would be doing basically nothing. He said that it would be appropriate if the order of conditions requires vegetation to the banking. March asked what other methods have been tried prior to this": Mr. Joy replied that he is not aware of any. Pauline asked if there were any further questions-P Peggy Collins of Cape Cod Survey Consultants stated that she had cormment She said that they are currently employed as engineering consultants for the New Seabury Corporation and the Maushop Village plans. They .have no problem In proposing or allowing to be, proposed an erosion control struc- ture for protection of property pre-existing. They do have some concerns in what they consider in an environmentally sound manner. Miss Collins pointed out that under section 30.3 that an erosion control structure under the state regulations is not permitted because the dwelling did not exist before 1978. She said that she did not have any information of when the houseson-site existed. She said that it is questionable that it can be permitted unless the variance procedure is followed with Another concern is for the design of the wall itself which shows a vertical and smooth face. The measure i .- which they suggest, is a roughened face tae- i cause it breaks up the gave action. Miss Collins said that with a straight wall structure that the scour does occur and it occurs at the base. She said that they often suggest that whenever a. rock wall or cement wail is suggested that it should be accompanied by a nourishment program to feed the waves that are coming in and also to provide a base support in front of the structure itself. She said that it was not uncommon for this sec- tion of beach to and rgo a one to two foot change in sediment patterns and to expose the footing Pauline said that she has personally seem a five foot change from one storm to the next. Miss Collins said that the point she was trying to make was when you are talking about a two to three foot burial structure of this type, it can be- come exposed in a relatively short period. She said that they realize that some time has been spent addressing the proposed activity of on-corning wages. Miss Collins said that through their efforts, at Maushop village in particular, they have had a lot of problems with run-off and the problems caused at the top of the bank. She said they had some questions with the information that doesn' t appear to be furnished s to ghat exactly the upland drainage characteristics are and what measures are being taken to discourage the 4ulleying from the top and the carrying of sediment down. Miss Collins said that Mr. Joy felt that the Commission should address vege- tation. She said they noted that had not been taken care of and they would