HomeMy WebLinkAbout20180103_SBPF_Request_for_NOI_Assent_Expanded_Geotube_Project_ReducedPREPARED FOR:12716 - C - 0002924 MARKETPLACE DRIVE, SUITE 200MADISON, WI USA 53719W.F. Baird & AssociatesCoastal Engineers Ltd.PREPARED BY:PROJECTLOCATIONMARTHA'SVINEYARDATLANTICOCEANNANTUCKETN.T.SN.T.SPROVIDENCENEWBEDFORDATLANTICOCEANPURPOSE: BLUFF STABILIZATIONDATUM: NAD83EXPANDED BAXTER ROAD ANDSCONSET BLUFF STORM DAMAGEPREVENTION PROJECTSCONSET BEACHCOUNTY OF NANTUCKETSTATE OF MASSACHUSETTSPO BOX 2279NANTUCKET, MA 02554ADJACENT PROPERTY OWNERS: SEE APPLICATIONAGENT: EPSILON ASSOCIATES, INC.DATE: 2018-01-04SHEET 1 OF 6VICINITY MAPFOR PERMIT USE ONLYNOT FOR CONSTRUCTIONPROJECTLIMITSSIASCONSET
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51005558566463718659606261656867697072376737875807779828182A84838590879299 114113919493969897100104101106105107108107A110109112116115117120119REVISIONSREV(T.I.)T.I.TYPE OFISSUEDESCRIPTIONDRN DSN APR YYYY-MM-DDREV.PREPARED FOR:1/4/2018 3:59:38 PMDate Plotted:P:\12643.101 SCONSET BEACH PRESERVATION FUND\H - CADD\WORKING DRAWINGS\C PERMIT\12643-C-010.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 FUNDEXISTING CONDITIONS12643C010 A 2018-01-04A CFOR PERMITBKC LMA GCT 2018-01-04GRAPHIC SCALE FEET0500250125NORTHGENERAL NOTES1. CONTOURS ARE DERIVED FROM THE 2017 LIDAR SURVEY AND THE FALL 2016 WOODS HOLE TOPO ANDBATHYMETRY SURVEY.2.ELEVATIONS ARE IN FEET AND ARE REFERENCED TO MLW '92.3.GEOTUBES TO BE FIELD FIT TO MINIMIZE EXCAVATION.TN-1TN-2122TN-3
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51005558566463718659606261656867697072376737875807779828182A84838590879299 114113919493969897100104101106105107108107A110109112116115117120119REVISIONSREV(T.I.)T.I.TYPE OFISSUEDESCRIPTIONDRN DSN APR YYYY-MM-DDREV.PREPARED FOR:1/4/2018 4:00:14 PMDate Plotted:P:\12643.101 SCONSET BEACH PRESERVATION FUND\H - CADD\WORKING DRAWINGS\C PERMIT\12643-C-010.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 PLANVIEW12643C020 A 2018-01-04A CFOR PERMITBKC LMA GCT 2018-01-04FOUR SAND FILLED 45'CIRCUMFERENCE GEOTUBES (TYP.)GEOTUBE RETURNTOP OF HIGHEST BAGEL. - +25.0GEOTUBE RETURNTOP OF HIGHEST BAGEL. - +25.0EXISTING JUTE AND COIRTEMPORARY STRUCTURETO BE REMOVED.EXISTING GEOTUBEEXACT LOCATION ANDELEVATIONS TO BE VERIFIEDTIE IN TO EXISTING GEOTUBESAS DIRECTED TO SITE ENGINEERGEOTUBE #4CREST EL. - +25.0'GEOTUBE #3CREST EL. - +18.0'GEOTUBE #2CREST EL. - +11.0'GEOTUBE #1CREST EL. - +4.0'FOUR SAND FILLED 45'CIRCUMFERENCE GEOTUBES (TYP.)4 - SAND FILLED 45'CIRCUMFERENCE GEOTUBES (TYP.)TIE IN TO EXISTING GEOTUBESAS DIRECTED BY SITE ENGINEERGRAPHIC SCALE FEET0500250125ANCHOR TUBE(TYP.)NORTH04001040020400304004TOP OF WATER TRENCH (± +5.0)BOTTOM OF WATERTRENCH (± -3.0)GENERAL NOTES1. CONTOURS ARE DERIVED FROM THE 2017 LIDAR SURVEY AND THE FALL 2016 WOODS HOLE TOPO ANDBATHYMETRY SURVEY.2.ELEVATIONS ARE IN FEET AND ARE REFERENCED TO MLW '92.3.GEOTUBES TO BE FIELD FIT TO MINIMIZE EXCAVATION.TN-1TN-2122TN-3
REVISIONSREV(T.I.)T.I.TYPE OFISSUEDESCRIPTIONDRN DSN APR YYYY-MM-DDREV.PREPARED FOR:1/4/2018 3:43:12 PMDate Plotted:P:\12643.101 SCONSET BEACH PRESERVATION FUND\H - CADD\WORKING DRAWINGS\C PERMIT\12643-C-010-NO GEO.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 PLANVIEW12643C030 A 2018-01-04A CFOR PERMITBKC LMA GCT 2018-01-04GRAPHIC SCALE FEET0500250125NORTH05005050060500705008GENERAL NOTESSAND TEMPLATE CRESTTOE OF SAND TEMPLATESAND TEMPLATE CRESTTOE OF SAND TEMPLATEAPPROXIMATE SAND TEMPLATEINTERCEPT WITH BLUFFEXISTING JUTE AND COIRTEMPORARY STRUCTURETO BE REMOVED.EXISTING GEOTUBEEXACT LOCATION ANDELEVATIONS TO BE VERIFIED1. CONTOURS ARE DERIVED FROM THE 2017 LIDAR SURVEY AND THE FALL 2016 WOODS HOLE TOPO ANDBATHYMETRY SURVEY.2.ELEVATIONS ARE IN FEET AND ARE REFERENCED TO MLW '92.APPROXIMATE SAND TEMPLATEINTERCEPT WITH BLUFF
REVISIONSREV(T.I.)T.I.TYPE OFISSUEDESCRIPTIONDRN DSN APR YYYY-MM-DDREV.PREPARED FOR:1/4/2018 3:42:16 PMDate Plotted:P:\12643.101 SCONSET BEACH PRESERVATION FUND\H - CADD\WORKING DRAWINGS\C PERMIT\12643-C-010.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 SECTIONS12643C040 A 2018-01-04A CFOR PERMITBKC LMA GCT 2018-01-04GRAPHIC SCALE FEET0502512.502TYPICAL GEOTUBE SECTION040ANCHOR TUBEEXISTINGGRADEFOUR SAND FILLED 45'CIRCUMFERENCE GEOTUBES (TYP.)-3.0+4.0+11.0+18.0+25.019' ±7.0' ±7.5' ±GEOTEXTILE100 YR STORM W.L (+7.68)5.0'PROPOSED SAND TEMPLATE5.0'+5.05.0' ±7.5' ±01TYPICAL GEOTUBE SECTION04003TYPICAL GEOTUBE SECTION04004TYPICAL GEOTUBE SECTION04021GENERAL NOTES1.ELEVATIONS ARE REFERENCED TO MLW '92.2017 (WOODS HOLE LIDAR)2017 (WOODS HOLE LIDAR)2017 (WOODS HOLE LIDAR)2017 (WOODS HOLE LIDAR)100 YR STORM W.L (+7.68)100 YR STORM W.L (+7.68)100 YR STORM W.L (+7.68)WATERTRENCH AREA2.0'2.0'2.0'2.0'
REVISIONSREV(T.I.)T.I.TYPE OFISSUEDESCRIPTIONDRN DSN APR YYYY-MM-DDREV.PREPARED FOR:1/4/2018 3:44:27 PMDate Plotted:P:\12643.101 SCONSET BEACH PRESERVATION FUND\H - CADD\WORKING DRAWINGS\C PERMIT\12643-C-010-NO GEO.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 SECTIONS - SAND TEMPLATE12643C050 A 2018-01-04A CFOR PERMITBKC LMA GCT 2018-01-04GRAPHIC SCALE FEET0502512.5+30 ±100 YR STORM W.L (+7.68)SAND TEMPLATE CREST05TYPICAL SAND TEMPLATE SECTION050GENERAL NOTES1.ELEVATIONS ARE REFERENCED TO MLW '92.2017 (WOODS HOLE LIDAR)100 YR STORM W.L (+7.68)100 YR STORM W.L (+7.68)100 YR STORM W.L (+7.68)TOE OF SAND TEMPLATESAND TEMPLATE INTERCEPT WITH BLUFF+30 ±SAND TEMPLATE CREST2017 (WOODS HOLE LIDAR)TOE OF SAND TEMPLATESAND TEMPLATE INTERCEPT WITH BLUFF+30 ±SAND TEMPLATE CREST2017 (WOODS HOLE LIDAR)TOE OF SAND TEMPLATESAND TEMPLATE INTERCEPT WITH BLUFF+30 ±SAND TEMPLATE CREST2017 (WOODS HOLE LIDAR)TOE OF SAND TEMPLATESAND TEMPLATE INTERCEPT WITH BLUFF07TYPICAL SAND TEMPLATE SECTION05008TYPICAL SAND TEMPLATE SECTION05006TYPICAL SAND TEMPLATE SECTION050
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Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS,
AeroGRID, IGN, and the GIS User Community
G:\Projects\Lighthouse\2013\NOI\aerial.mxd
Figure 2Aerial Locus
Expanded Baxter Road and Sconset Bluff Storm Damage Prevention Project Nantucket, MA
LEGEND
Existing Project Lots
Expanded Project Lots
Property Boundary
Basemap: 2016 Aerial Imagery, ESRI °0 150 30075
Feet1 inch = 300 feet
Scale 1:3,600
SBPF NOI Assent
The undersigned, as the property owner of record for the property located at Tax Parcels
48-6, 48-8, and 49-9 at the Sconset Bluff, Nantucket, Massachusetts, assent to the filing
for the Notice of Intent (NOI) dated ________, ______ by the Siasconset Beach
Preservation Fund Inc (SBPF). with the Nantucket Conservation Commission for an
expansion and alteration of the Baxter Road and Sconset Bluff Storm Damage Prevention
Project, which includes my property in the project area.
For my title, see Book 102 Page 119, Book 185 Page 52, and Certificate of Title 1702. This assent authorizes SBPF to file the NOI but does not waive or grant any other rights
or assume any liabilities or obligations related thereto. No work is authorized. However,
permission is granted for the reasonable entry only to my land for inspection, survey, and
other information gathering purposes related to the NOI.
Dated______________, _______.
_______________________________
Name:__________________________
Title:___________________________
Sconset Geotube Project Timeline 2012-2013 Winter- Major storms cause significant erosion of Sconset Bluff near Sankaty Lighthouse, moving bluff edge as much as 40 feet toward road shoulder between 85 and 115 Baxter Road. Town begins planning for closing Baxter Road. April 2013- Siasconset Beach Preservation Fund proposes Public-Private Partnership with Town to prevent erosion that would result in the closure of Baxter Road, with loss of utilities and access to the homes on this public road.
July 2013- Town and SBPF enter into a Memorandum of Understanding approved unanimously by Board of Selectmen to support permitting of a 4000-foot long rock revetment at the toe of the bluff running from the
Lighthouse property to mid-Baxter where erosion has advanced. SBPF files an application (Notice of Intent [NOI]) for the revetment with the Nantucket Conservation Commission (Con Com). October 2013 – With revetment hearings dragging on and winter storm season approaching, SBPF and the Town file a new NOI with the Con Com for four tiers of geotextile tubes along 1500 feet from 85 to 107A Baxter. SBPF suspends consideration of the NOI for the revetment. Revised MOU is entered into between SBPF and Town, approved by BOS.
November 2013- With Con Com hearings on the geotube project moving slowly, SBPF files an emergency application for a 900 foot-long geotube installation along the most threatened section of Baxter Road. Con Com denies application. SBPF appeals the denial to State Department of Environmental Protection (DEP). DEP overrules the Con Com and issues a Superseding Order approving the emergency application. The Con Com considers the DEP permit, considers multiple compromise proposals, and then issue issues its own Emergency Permit for three tiers of geotextile tubes.
December 2013-January 2014- Emergency Geotube project is installed. Spring 2014- As is required when an Emergency Permit is issued, a full NOI – jointly filed by the Town and SBPF--is submitted to the Con Com. Four additional public hearings are held. June 2014- Con Com denies the NOI for the geotube project. SBPF appeals to DEP. December 2014- DEP issues another Superseding Order overruling the Con Com. Con Com appeals DEP’s ruling.
January 2015 to Summer 2015- With conflicting appeals tied up in court, the BOS forms an informal working group consisting of two from Con Com, two from BOS and two from SBPF to try to propose a settlement. August 2015- Settlement agreement is reached by informal working group. SBPF agrees to withdraw the revetment application and to postpone expansion of geotubes for protecting full-length of 4000 feet of eroded bluff until 2018.
September 2015 to February 2016- Con Com approves NOI for geotube project. Completion of geotube project including installation of storm water management from Baxter Road is achieved. Vegetation of bluff face
is completed in Spring 2016. January 2018- NOI for full, 4000-foot geotube project to be filed.
SBPF Expanded Project Description
The SBPF is proposing to extend the existing geotextile tube project at 87-105 Baxter Road (the “Existing Project”) to provide storm damage protection for homes and other public infrastructure along the portion of the Sconset Bluff that continues to actively erode. The new section of geotextile tubes will extend north from the Existing Project to 119 Baxter Road and south from the Existing Project to 59 Baxter Road, thereby providing continuous protection from 59[1] to 119 Baxter Road. The total length of the geotextile tube system will increase from about 950 feet to about 3,800 feet.
The proposed length of the extended project is as follows: to the north, approximately 815 feet plus 74 feet for the northern returns; to the south; approximately 1,895 feet plus 69 feet feet for the southern returns. In order to provide protection from a 100 to 200-year storm, four tiers of geotextile tubes are proposed. These four tiers of geotextile tubes will provide continuous protection for the entire length of Sconset Bluff that is vulnerable to erosion and storm damage. As with the Existing Project, the bluff face will be vegetated using American beachgrass or other native vegetation where needed to help stabilize the face of the bluff and prevent surface erosion. A similar sand mitigation program is proposed as for the Existing Project. Collectively, the new geotextile tubes, proposed bluff vegetation, and sand mitigation are referred to as the “Proposed Project.”
The Proposed Project will incorporate a robust monitoring program that is similar to what has been implemented for the Existing Project and will adopt the same failure criteria as currently required for the Existing Project.
[1] The segments of the Project at 59 Baxter and the southern half of 61 Baxter will be assessed prior to
construction start to determine that there is no coastal dune.
Summary of Existing Project and Proposed Project
Existing Project Proposed Project
Project Description
Three to four tiers of 45-foot circumference geotextile tubes with 30-foot circumference returns.
Lowest tube at 0 MLW, top elevation of 27 MLW.
Four tiers of 45-foot circumference geotextile tubes with 45-foot circumference returns.
Lowest tube at -3 MLW, top elevation of 24-25 MLW.1
Vegetation with American Beachgrass and other native woody species, except for upper 5 to 7 feet (to provide swallow nesting habitat).
Vegetation with American Beachgrass and other native woody species.
Project Monitoring and Mitigation
Shoreline monitoring:
• Frequency is quarterly for 3 years, then semi-annual can be requested
• Surveys must extend to -5 MLW.
• Bathymetry must occur twice a year.
Shoreline monitoring:
• Since quarterly surveys have been conducted for 3 years as required, semi-annual monitoring is proposed.
• Surveys are proposed to extend to 0 MLW, with extrapolation to -5 MLW (analysis of survey data indicates extrapolation results in an error of only1.4%, while cutting survey time in half and eliminating risk to swimmers collecting the data).
• Bathymetry is proposed every 1-3 years because it yields more limited information regarding assessment of geotube project.
Wetland well monitoring:
• Required 3 times/year.
Wetland well monitoring:
• Not proposed; no impacts observed or anticipated after 2 years of monitoring.
1 The Project is considering either a shroud or polyurea coating to increase the durability and longevity of
the geotubes. This may negatively affect the achievable elevation of the geotubes during construction
resulting in a slightly lower structure. The base elevation of the structure (-3’ MLW) is the critical elevation
of the structure so a shroud or coating would affect the top elevation of the structure
Underwater video monitoring:
• Required 2 times/year (each spring and fall).
Underwater video monitoring:
• Proposed once every 3 years based on two years of semi-annual monitoring with no observed impacts.
Beach invertebrate monitoring:
• Required one time (summer 2016).
Beach invertebrate monitoring:
• Not proposed; completed survey results indicate no unique or noteworthy organisms and no observed or expected impacts.
Mitigation:
• 22 cy/lf/yr base required volume, to be placed annually regardless of volume left in template.
Mitigation:
• Keep geotubes covered plus re-fill sand template to minimum of 22 cy/lf before start of each new storm season.
Failure Criteria and Escrow Account
Failure criteria as listed in OOC. Failure criteria as listed in OOC. (No change.)
Escrow account as required by OOC. Escrow account as required by OOC. (No change.)