8/25/1988 CONSERVATION COMMISSION Minutes

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Conservation commission 'August 25, 1988 Page 79 He continued, subsequently, s1gnificant rainfall determ1ned the pipe was springing las and creating even greater problems than existed before. Lisa pointed out it was the state's requirement, their approach, to file a Notice of Intent. Mr, Kirrane stated the subdivision was designed in the o's. The drainage, at that time complied with the subdivision control law regulations. obviously, that drain- age at that location is inadequate. They are proposing to remove the pipe which has been blocked off so there is no flow into Mashpee River, but the blocking off has caused the pipe to spring soneleaks. They are proposing to remove the pipe and plug the pipe at the location of the storm drain, In addition, the storm drain will be cleaned as apparently a significant portion. of the problem relates to inadequate maintenance of the storm drain. They are proposing to provide additional storm drainage and leaching capabilities. He tried to contact the highway department for the purpose of discussing this proposal in advance of this hearing to determine whether or not there was a recommendation from that department that he could supple- ment this plan with a filing to address that application and has received no recomm- endations from the Highway departrent. He introduced Jack Landers Cauley from Arrow Engineering. Mr. Rosenberg asked if Redwood circle was a town road and was told it was private. Ms Behrman stated lot 15 is not subject to the current hearing. The house has been constructed on lot 1 . Mr, auie _stated i i theiridea o get the water away from the River. In order to r D n i m i e the imp on the_`r_ i ver_or' on the lot, they propose to place two 'leaching I basins on the gest side of the road, farthest from the river, where the transformer is located, within the road layout. The sketch shows the two existing basins that disect the sides of the goad which would be converted to solid catch basins. They intend to remove the 101 connected to the down gradient side of the catch basins within the layout off of lots 14 and 15 as far away from the Mshpee River as poss- ible on the top of the shoulder where it is easy to access, disconnect it and plug the catch basins, clean the basins out, and since they're solid they assume they're catch basins, reconstruct on the opposite side of the street two outlets, each to be directed towards a leaching basin. This design as stated in the letter to the DPW is quite super i ou r to what's out there now, If there is a problem with maintenance and the catch basins aren't maintained, the leaching basins won't silt p; thein ability to percolate will be maintained a lot more regularly tharthroughout the whole sub- division. Earlier, Lisa brought to his attention the Town Engineer recommends certain design standards for the drainage. He has not had time to get those for this evening. He would like to finish his presentation tonight and see if it is a reasonable concept that the Commission can accept; one that Mr. Sullivan has accepted, then if it is a ratter of coming to design standards for the Town, they would go about doing that. Design standards for the Town are l in lg years, he would like to hold that standard. Lisa stated Mr. . owley wants ether 1n 10 or 1 �n he suggested both. Mr. Galey stated he would want to design a to year story. There will be no specimen trees taken .down. Being in the layout, the Association can have the responsibility, after const ruction, to do any maintenance they choose to do as an association. Ms Behrman asked will the bank be revegetated as when the catch basin overflowed, they were eroded, on lot 14.