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Minutes of conservation commission Page <br /> January 41 198 <br /> Peter Erce2 Nirenberg 7 8 :30 P.M. Hearing <br /> Mr. joy of Coastal Engineering Company, Orleans, was present to represent <br /> the applicant in a proposal to construct share front protection for Lot <br /> 99 'triton Way along Succonnesset Point. <br /> Mr. Joy familiarized the Board with the three lots which have unprotected <br /> frontage. He told the members that Peter Brceg has a purchase and sale <br /> agreement with Charles Nirenberg for Lot 526. He is raking application <br /> for a sea wall on New Seabury property fronting 524, 525 and 526 with the <br /> consent of Doctor ckten and Harold Cohen. Mro Joy pointed out a massive <br /> concrete sea wall on property in the area belonging to cberto' s. He also <br /> pointed out a rubble structure which looked like it protected an old wall <br /> at one time. Further on down, he pointed out a shelf with extensive rack <br /> revetment work. <br /> Mr. Joy said that in the Notice of Intent he indicated that they would be <br /> constructing the wall at the toe of a coastal bank with the idea of pre- <br /> venting continual erosion at the toe of the bank. <br /> At this point, Nor. idy presented photographs of the area and gave a sum- <br /> mary of each. A set of prints was given to the Commission for the files. <br /> Mr. Joy said that his engineering firm has constructed a lot of this type <br /> wall on various warts of the Cape, He sowed the Board a picture of the <br /> wall constructed at Indian Neck, Wel if lee t. <br /> ` r,. Joy asked whir they would want to put a wall of this type on this type <br /> of shorelines He said the idea is to stop erosion at the toe of the slope <br /> which takestakc.:-is places mostly y ori wind blown spring tides probably 20 or 30 <br /> tides a year) . He said that this particular type of wall i 'excavated t <br /> point of a minimum of three feet below the existing cobble beach. The <br /> wall, which is vertical, has a zig zag -effect to it. He said that is a <br /> very strong wall because it is a folded plate. <br /> Jean Thomas asked how far below do the footings go fir. Joy said that the <br /> bottom of the footing is approximately three feet below the beach. <br /> Mr, Joy said that the structural design computations which they have run on <br /> the wall are based on the fact in the worst situation where the gall is fully <br /> inundated by water they back f ill and the toe is exposed. He said that in <br /> one particular appeal they have run all sorts of computations for- DEQ " on <br /> this type of a wail for those type of conditions. <br /> Mr. Joy said that the title search elevation along the coast is elevation <br /> eleven, which is the 100-year elevation. The 50-year elevation is 9.0 and <br /> the 10-year elevation is 5.4. He said with the 100-year event, there would <br /> be storm surge elevation overtopping the wall.. The wall is the type which <br /> will take o erwatch. He said that when the water overtops bulkheads, they <br />