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HomeMy WebLinkAbout2000_07_25 Coastal Zone Management Commission Minutes Town of Mamaroneck — Village of Larchmont 119 COASTAL ZONE MANAGEMENT COMMISSION • TOWN CENTER: 740 West Boston Post Road, Mamaroneck, NY 10543 - = 914-381-7845 CZMC Minutes — Draft July 25, 2000 A regular meeting of the Coastal Zone Management Commission ("CZMC") was held on July 25, 2000, in Conference Room A, Town Center, 740 West Boston Post Road, Mamaroneck,NY. The meeting was called to order at 8:15 p.m. MEMBERS PRESENT: • Lili Andrews Elizabeth Cooney William Bailey Marc Godick Madelaine Berg, Chairperson Bernard Kaplan Frank Buddingh C. Alan Mason REGRETS: Howard McMichael Eileen Weingarten OTHERS PRESENT: Phyllis Wittner, Member, Mam'k Town Board Phillip F. Ruppel Seth Marcus Anne Ruppel Richard Scheuer Tom Schwartz Dr. M.I. Miclat, Jr. Harry W. Nichols, Jr., P.E. 1. Approval of Minutes The minutes of the June 27, 2000, meeting were read and approved as corrected. 2. Referral of 10 Evergreen Lane Town of Mamaroneck Planning Board Block 309, Lot 21 Harry W. Nichols, Jr., P.E., the engineer for the Applicant spoke to the Commission and addressed specifically some of the statements contained in a June 27, 2000 report by Campbell Engineering. Mr. Nichols stated that the proposed design had been changed so that all storm water would be retained on Lot 21, rather than having the © potential to back up onto Lot 20 as the original design had contemplated, and the clay liner in the detention basin will now go up to the 100 year storm elevation. Mr. Nichols tJ Printed on Recycled Paper also stated that, although the owner of Lot 21 is not required to repair problems with the detention basin on Lot 20, the design of the detention basin on Lot 21 would, in fact, handle the seepage from the berm on Lot 20. Mark Godick questioned whether the fill material around the proposed dry wells would allow percolation in accordance with the submitted data. Mr. Nichols stated that the engineer would certify the percolation rates of the fill. Seth Marcus, the attorney for some of the neighbors of the site, noted that the original subdivision drainage study had been faulty, so that using it as a basis for the preparation of current data is unreliable. Mr. Nichols said that the faulty nature of the previous drainage study would not affect his calculations, since the relevant issue here was whether there would be a net increase in the rate of runoff from the site, and that calculation could be accurately made, regardless of the earlier data. The Commission examined the question of whether the proposed extension of an existing pipe from the detention basin on Lot 20 to the watercourse on the far side of the proposed driveway, and the filling of the watercourse surrounding the extended pipe, was consistent with the LWRP. Mr. Nichols noted that it was necessary to extend the pipe and fill the surrounding area in order to construct the driveway and provide access to the site. The Commission determined that the installation of the pipe and the filling of the watercourse was not consistent with the policies of the LWRP. However, based up Mr. Nichols' report,the Commission did not believe that the proposed fill or extended pipe would have a significant impact on the watercourse. The Commission also determined that, based upon the engineer's report, the proposed re-grading of the site will not result in a net increase in the rate of runoff from the site, and that, accordingly, the change in grading will not have a significant impact. The members of the Commission expressed concern, however that any flaw in the calculations in the data submitted could result in the exacerbation of an already acute problem with flooding in the area surrounding the site. Accordingly, the Commission agreed that it wanted to urge the Planning Board to have the Town Engineer carefully review the data being submitted. The Commission also took note of certain historical maps which were shown to it by Richard Scheuer, which show that, at one time,there was a watercourse which ran across Lot 21 in the approximate location of the proposed house. The Commission expressed some concern that the watercourse could seek to reestablish itself, leading to additional drainage problems at the site. The Commission agreed upon the following recommendations which would be made to the Planning Board as part of the Commission's response to the Board: a) The Applicant should agree to a covenant, recorded on the deed, that the owner of the site will maintain the detention basin which is to be constructed on Lot 21, and grant the Town the right to enter upon the property to maintain or repair the detention basin in the 2 event that the owner fails to do so. The town should also retain the right to charge the owner, in the form of a tax, for the costs it incurs in the maintenance or repair of the basin. b) The Applicant should demonstrate that it has taken soil borings in the area surrounding the proposed dry wells to establish the surrounding area will support the expected percolation so as to prevent seepage on the southern side of the property. c) Areas with relatively steep grades, which pose a risk of excessive siltation should be resodded and/or netted to prevent siltation. d) Pavers in sand should be used to the maximum extent possible on the driveway and forecourt area, rather than impermeable surfacing materials. e) Proposed plantings should include native species. 3. New Business There was no new business. 4. Old Business There was no old business. The meeting was adjourned at 10:30 p.m. The next scheduled CZMC meeting will be held on August 22, 2000. 3