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Home My WebLink AboutAmended Order of Conditions Request SBPF 87_105 Baxter Road (48_Various) SE48_2824 PRINCIPALS Theodore A Barten, PE Margaret B Briggs Dale T Raczynski, PE Cindy Schlessinger Lester B Smith, Jr Robert D O’Neal, CCM, INCE Andrew D Magee Michael D Howard, PWS Douglas J Kelleher AJ Jablonowski, PE Stephen H Slocomb, PE David E Hewett, LEED AP Dwight R Dunk, LPD David C. Klinch, PWS, PMP Maria B. Hartnett ASSOCIATES Richard M. Lampeter, INCE Geoff Starsiak, LEED AP BD+C Marc Bergeron, PWS, CWS 3 Mill & Main Place, Suite 250 Maynard, MA 01754 www.epsilonassociates.com 978 897 7100 FAX 978 897 0099 Projects:\21597\2013 Emergency Project\2015 NOI\OOC Amendment Request September 28, 2018 Mr. Jeff Carlson Via Electronic Mail and Federal Express Natural Resources Director, Town of Nantucket Nantucket Conservation Commission 2 Bathing Beach Road Nantucket, MA 02554 Subject: DEP File No. SE 48 – 2824 Sconset Bluff Geotextile Tube Project Nantucket, MA Requested for Amended Order of Conditions Dear Mr. Carlson and Commission Members: On behalf of the Sconset Beach Preservation Fund (“SBPF”), Epsilon Associates, Inc. (“Epsilon”) submits this request to amend Order of Conditions (“OOC”) for the above refined project pursuant to Standard Condition No. 14 which reads: “Any change to the plans identified in Condition #13 above shall require the applicant to inquire of the Conservation Commission in writing whether the change is significant enough to require the filing of a new Notice of Intent.” This request is consistent with the Massachusetts Department of Environmental Protection (“MassDEP”) Wetlands Program Policy 85-4: Amended Orders Policy which requires applicants to; 1) provide a narrative description of the proposed changes, 2) provide plans depicting the proposed changes. Proposed Changes Construction of the existing geotube project was completed in February 2016 and ongoing monitoring of the project continues pursuant to the OOC special conditions. Ongoing monitoring reveals that sand at the northern and southern ends of the existing geotube returns has eroded. As we enter another winter season the SBPF requests that the current OOC be amended to allow installation of 50 foot long coir fiber roll returns at the northerly and southerly ends of the existing Jeff Carlson 2 Nantucket Conservation Commission September 28, 2018 geotube stabilization system; see attached sheets C-010 Proposed Planview and C- 020 Typical Sections. These returns are needed to preserve the integrity of the geotube system and to avoid continued erosion at the ends. Construction will be similar to that required to install the geotubes, but to a lesser degree because the coir fiber rolls are more easily installed than the sand filled geotubes. The anticipated duration of construction is approximately one month. Construction will proceed according to the following sequence: 1. Construction equipment will access the beach via Hoick’s Hollow. 2. Excavate a trench for the lowest tier of coir fiber roll to elevation +3.0 feet MLW. The trench will be approximately five to six feet wide and 50 feet long. Material excavated from the trench will be temporarily placed seaward of the trench. 3. The bottom row of coir fiber roll will be anchored into the ground using helical anchors and cables to hold the roll in place. The lower tier of coir fiber roll will be a high density coir roll. 4. Subsequent coir fiber rolls will stacked in a step wise pattern and will be held in place with duck-bill anchors and cables. These rolls will be low density coir fiber rolls. Sand will be placed behind the rolls in lifts and encapsulated with coir netting and mesh to construct a coir roll and coir fabric envelope stabilization system. 5. The top coir fiber roll will be held in pace with helical anchors and cable. 6. Following installation of the of coir fiber rolls and sand backfill, the trench will be backfilled with sand excavated from the trench and re-graded to match pre- construction grades. 7. The coir fiber roll returns will be covered by sand as part of the ongoing sand template filling program to maintain the integrity of the Coastal Bank and bluff, and to provide a sediment source. 8. Equipment will be demobilized from the site via Hoick’s Hollow. All construction equipment will access the beach from Hoick’s Hollow. All construction vehicles will be fueled in the Hoick’s Hollow parking lot area. Jeff Carlson 3 Nantucket Conservation Commission September 28, 2018 This work will involve stabilizing, and work on an additional 100 linear feet of Coastal Bank (50 feet on either end of the existing geotube stabilization system); thus increasing the total length of work on Coastal Bank from 950 linear feet to 1,050 linear feet of Coastal Bank . This work is required to maintain the stability of the Coastal Bank and bluff, and to maintain the integrity of the existing geotube bank stabilization system. Whereas the proposed returns will become part of the existing geotube system, this work will be subject to the conditions enumerated in the OOC authorizing construction of the geotube stabilization system. Abutters to the existing geotube system are being notified by certified mail and the municipal OOC Amendment fee and newspaper notice checks are attached hereto. Please review the attached plans and contact me at (978) 897-7100 or via email at ddunk@epsilonassociates.com; or Mr. Arthur D. Gasbarro, PE, PLS at Nantucket Engineering & Survey, P.C at (508) 825-5053 or via email at art@nantucketengineer.com with questions regarding these project changes or to schedule a meeting to discuss these changes. Sincerely, EPSILON ASSOCIATES, INC. Dwight R. Dunk, LPD, PWS, BCES Principal cc: MassDEP-SERO J. Posner, SBPF A. Gasbarro, Nantucket Eng. & Survey G. Thompson, W.F. Baird & Assoc. encl.: Sheet C-010 Sconset Beach Preservation Fund – Proposed Plan View Sheet C-020 Sconset Beach Preservation Fund – Typical Sections Abutters Information 868590879299919493969897100104101106105107107A1090255075 0 2550 7 5 0 25 5 0 75REVISIONSREV(T.I.)T.I.TYPE OFISSUEDESCRIPTIONDRN DSN APR YYYY-MM-DDREV.PREPARED FOR:9/25/2018 10:57:56 AMDate Plotted:P:\12643.101 SCONSET BEACH PRESERVATION FUND\H - CADD\WORKING DRAWINGS\C PERMIT\12643-C-PERMIT-COIR-RETURNS.DWG DRAWING NUMBER:DATE:PREPARED BY:W.F. Baird & Associates Ltd.(A) INFORMATION(B) REVIEW(D) TENDER DOCUMENT(F) RECORD(E) CONSTRUCTION DOCUMENT(C) PERMITSCONSET BEACH PRESERVATION FUNDPROPOSED PLANVIEW12643C010 A 2018-09-25A CFOR PERMITBKC LMA GCT 2018-09-25EXISTING GEOTUBEEXACT LOCATION ANDELEVATIONS TO BE VERIFIEDGRAPHIC SCALE FEET020010050NORTH02001GENERAL NOTES1. CONTOURS ARE DERIVED FROM SURVEY BY AIRSHARK MAY 14 2018 AND THE 2016 SBPF HYDRO SURVEY.2.ELEVATIONS ARE IN FEET AND ARE REFERENCED TO MLW '92.3.COIR FIBER ROLLS TO BE FIELD FIT TO MINIMIZE EXCAVATION.TAPER FIBER ROLLSINTO THE BANKEL. - +12.002001TAPER FIBER ROLLSINTO THE BANKEL. - +12.050'50'HYDROGRAPHIC CONTOURS DERIVED FROM2016 SBPF SURVEYTOPOGRAPHIC CONTOURS DERIVED FROMMAY 14 2018 AIRSHARK SURVEY REVISIONSREV(T.I.)T.I.TYPE OFISSUEDESCRIPTIONDRN DSN APR YYYY-MM-DDREV.PREPARED FOR:9/24/2018 5:28:29 PMDate Plotted:P:\12643.101 SCONSET BEACH PRESERVATION FUND\H - CADD\WORKING DRAWINGS\C PERMIT\12643-C-PERMIT-COIR-RETURNS.DWG DRAWING NUMBER:DATE:PREPARED BY:W.F. Baird & Associates Ltd.(A) INFORMATION(B) REVIEW(D) TENDER DOCUMENT(F) RECORD(E) CONSTRUCTION DOCUMENT(C) PERMITSCONSET BEACH PRESERVATION FUNDTYPICAL SECTIONS12643C020 A 2018-09-25A CFOR PERMITBKC LMA GCT 2018-09-25GRAPHIC SCALE FEET0842100 YR STORM W.L (+7.68)01SOUTH - COIL FIBER ROLL RETURN SECTION020GENERAL NOTES1.ELEVATIONS ARE REFERENCED TO MLW '92.NOTE:SOIL LIFTS CONSISTING OF A SINGLE LAYEROF C-700 COIR NETTING AND MESH COMPARABLETO THE CASING OF THE FIBER± +12.0± +3.0SOIL LIFTS(SEE NOTE)20" COIR FIBER ROLLSUPPER ROLLS LOW DENSITYLOWER ROLLS HIGH DENSITYDB88 DUCKBILL ANCHOR3' O.C. ATTATCHED TO FIBERROLLS WITH CABLES02NORTH - COIR FIBER ROLL RETURN SECTION020NOTE:SOIL LIFTS CONSISTING OF A SINGLE LAYEROF C-700 COIR NETTING AND MESH COMPARABLETO THE CASING OF THE FIBER± +12.0± +3.0SOIL LIFTS(SEE NOTE)20" COIR FIBER ROLLSUPPER ROLLS LOW DENSITYLOWER ROLLS HIGH DENSITYEXISTING GRADE(MAY 14, 2018)DB88 DUCKBILL ANCHOR3' O.C. ATTATCHED TO FIBERROLLS WITH CABLESEXISTING GRADE(MAY 14, 2018)EXCAVATE TRENCH AREA(AS REQURED)EXCAVATE TRENCH AREA(AS REQURED)MEAN HIGH WATER (M.H.W.) +3.0HELICAL ANCHORSTO BE USED FOR TOP ROWHELICAL ANCHORSTO BE USED FOR BOTTOM ROWHELICAL ANCHORSTO BE USED FOR TOP ROWHELICAL ANCHORSTO BE USED FOR BOTTOM ROWH.T.L. (+4.2)100 YR STORM W.L (+7.68)MEAN HIGH WATER (M.H.W.) +3.0H.T.L. (+4.2)