HomeMy WebLinkAboutNOI 4.29.24
Narrative
Notice of Intent
911 Great Island Road, West Yarmouth, MA
Sediment Replenishment
The area subject to this Notice of Intent is a west facing Coastal Beach resource area associated with Nantucket
Sound. Please see the locus map for the exact location. The general reach of shoreline is a segment of Great
Island coastline, a rocky, glacial moraine remnant landform dividing Nantucket Sound from Lewis Bay. The
specific reach of coastline has been eroding in some measure for decades, due to natural forces of the wind,
tides and large vessel wakes from the Nantucket Island ferry traffic navigating the Hyannis Harbor channel.
Sediment supply interruptions and related effects are due in part to the older stone groins and stone breakwater
formations (WW License No. 197) that populate the circumference of Great Island. The beach deposit consists
of medium textured quartz sand with an abundance of slipper shells, pebbles, and cobble stones. Past erosion
management projects at this site incorporated anchored fiber rolls with sand fill as an effort to inhibit coastal
bank erosion. Those measures have failed with scattered debris and corroded cables populating the beach area.
The applicant intends to add sediment replenishment to the beach landward of the high-water line at the beach
bank juncture. The sediment will result in a minor elevation increase to reduce storm damage to the Coastal
Bank. The sand supply will be meted out as storm tides encounter the sand in the proposed location along the
coastal bank. A secondary purpose of this NOI is to access the same beach area to retrieve and dispose of the
disassembled, scattered coir rolls and anchor tethers.
The 2009 Order of Conditions (SE83-1852) included sediment replenishment. The purpose was to maintain
sand cover on the coir roll array. The applicant intends to seek an Order of Conditions to add sediment as a
means of maintaining a beach elevation for purposes of reducing erosion of the Coastal Bank. The activity
supports the common wetland interests of storm damage prevention and flood control, replenishing a Coastal
beach deposit in a state of sediment deficit.
Sieve analysis of the existing sediment shows the soil texture highly consistent with commonly available upland
sources. Some of the established on-site soil is upland sourced. The current proposal calls for an upland source.
Sand volume of approximately 600 cubic yards can be delivered via the previously used access route along the
north lot boundary from Great Island Rd. The activity for adding sand fill will be a continuous activity as the
material is placed and a rubber tired front-end loader will distribute material in the area shown on the plan. The
process of delivery is described at 10 trips per day of 20 c.y. each for a term of 3 days.
A portion of the site encompassing approximately 50% of the project area on the north end is within a NHESP
mapped Priority Habitat. It is anticipated that a time of year restriction for sand work activity will be part of the
protocol for the sediment replenishment.
The activity will have no adverse effect in the intertidal area. The material will be dispersed over time and will
benefit the beach deposit in this area which has been affected for more than half a century by the older offshore
stone formations interrupting the on-shore migration of sediment.
IMAGES
COASTAL BEACH AT 911 AND 921 GREAT ISLAND ROAD, WEST YARMOUTH
APRIL 19 - 22, 2024
Figure 1 – View south of 911 Great Island Rd. beach. # 921 beach in distance near glacial erratic.
Figure 2 – View north of 911 Great Island Rd. beach
Figure 3 – View south of 921 Great Island Rd. beach.
Figure 4 – View south of 911 Great Island Rd. beach
Project Name:Tested By:R. Perry Date:4/21/2024
Location:Sampled by:R. Perry Date:4/19/2024
Boring No:Test Number:1
Sample Depth:Gnd Elev.:4 NAVD 88
USCS Soil Classification:
Comment:
Weight of Container (g):N/A Weight of Container & Soil (g):N/A
Weight of Dry Sample (g):346.7
Sieve Number Diameter
(mm)
Mass of Sieve
(g)
Mass of Sieve
& Soil (g)
Soil Retained
(g)
Soil Retained
(%)
Soil Passing
(%)
#4 4.75 0.0 0.0 100.0
#10 2.00 0.0 0.0 100.0
#20 0.84 3.4 1.0 99.0
#40 0.43 218.7 63.1 35.9
#60 0.25 109.8 31.7 4.3
#100 0.15 12.8 3.7 0.6
#200 0.075 0.3 0.1 0.5
Pan 0.0 0.0 0.0
TOTAL:345.0 99.5
Sieve Diameter
(mm)% Passing % Passing
4 4.75 100
10 2 100
40 0.425 100
200 0.075 100
4 4.75 0
10 2 0
40 0.425 0
200 0.075 0
% Gravel:0 D10:0.29 Cu:1.8
% Sand:100 D30:Cc:
% Fines:0 D60:0.53
Cu = 2.3 - Poorly graded (Med. sand.)
Muncell color 2.5 Y 7/2 (light); Clean; 1.7 g. seive screen loss
Grain Size Distribution Curve Results:
Sieve Analysis Data Sheet - Cape Cod Engineering, Inc.
PO BOX 1517, EAST DENNIS, MA 02641 - 508-385-1445
AWAD - BEACH
911 Great Isle. Rd.
N/A
0 - 8 inch composite
0
10
20
30
40
50
60
70
80
90
100
0.010.101.0010.00% PassingParticle Diameter (mm)
#4 #10 #40 #200GRAVELCoarse
SAND
Medium
SAND
Fine
SAND SILT/CLAY
14.333 Sieve Analysis Worksheet Revised 02/13 __ of __