4/16/1992 CONSERVATION COMMISSION Minutes

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" SEE CONSERVATION COMMISSION fy MINUTES OF APT, lei, 1992 Commissioners Present: Harry Desrosiers, Renee F data, Elizabeth Terry, Patrick Coffey. Associate member Elizabeth Terry was appointed full voting member for quote purposes. 2 Sandy Way, request for an amended order of Conditions under SE -953. .Mr. Cine would like to put in an asphalt driveway instead f a stone drive. Mr. Sherman advised the pitch is towards the street, away from the wetland. He had no problem with this request. Public comments were requested; there were none, VOTE: Motion made and- seconded to close the hearing. FAD ORDER TD BE ISSN] . 7:00 M REVEMRT, Continued from March 19, 1992. Norman Ha esresentin p g with Check Dill, coastal geologist. There i's an order granted by the Cape Cod Conmdssion on March 5 tailored after the beach nourishunent order of Conditions which is 'on oing. Photos were dis- played showing storm events, revetments that are coning apart. A second lot new has a revetment that will be coming before the commission, o of the beach areas along from the golf course to the start of Ppponesset Spit is eroded. The Belkin property is going to be armored. 925 feet representsi representthe area to be armored for Maushop, a 2+% total increase. The cottages have been moved back as far as allowed, Mean High Water is at 1.9 feet. All construction will be above extreme high water nark. It .does. not need an ACOE pest. There is some scouring. Any material brought down here is carried off for a net loss. They are putting down 2,650 c. .for beach nourishment. The erosion rate is 2.2 feet per year. Mr. Dyes listed the amounts of beach nourishment along the shore lime, There is emerging salt marsh and tree stumps that have been berried. Erosion occuring is eroding and migrating the beach back* Transport is in the direction of the Northwest coming in from the Southwest. Changes in sediment due to the armorment structures are interupting currents. The structure is designed on the loo year storm event; Class 3 hurricane.- It is a double row of armonnent backed with filter fabric. It is at elevation 16. Mr. Sherman asked if the picture represents the true slope, Mr. Hayes stated it does, it is 2 to 1. It was the practice to use smooth fake with very little dissipation of the wave energy. Eight ton toe stones will be used. The off- shore bottom is stable. At Tide Watch, they are getting a deepening of the off-shore gradient. When the fill is brought down to Clamshell Road l they will have to tie in so it is non-detrimental to adjacent properties. Beach nourishment will protect the coastal bank. Under the final order of Conditions by the State, there is n opportunity for the applicant to nourish in a severe storm event.