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Player, Christine
Subject:FW: FINAL SAP for Barnstable 10 Year Dredging and Beach Nourishment Project
-----Original Message-----
From: Loyd, Richard B CIV USARMY CENAE (US) <Richard.B.Loyd@usace.army.mil>
Sent: Thursday, April 09, 2020 11:09 AM
To: Jacek, Christine M CIV USARMY CENAE (USA) <Christine.M.Jacek@usace.army.mil>; Player, Christine
<Christine.Player@foth.com>
Cc: Farris, Charles N CIV USARMY CENAE (USA) <Charles.N.Farris@usace.army.mil>
Subject: FINAL SAP for Barnstable 10 Year Dredging and Beach Nourishment Project
Hello Christine,
Attached is the final sampling and analysis plan for the Barnstable 10 year dredging and beach nourishment project.
Please let me know when the sampling effort has been scheduled so that we can be prepared to discuss additional core
locations in the event that you encounter fine grained material within the proposed dredge footprint. Contact me if you
have any questions regarding the sampling methodology or data deliverables. Once the final data package is ready
please e-mail it to me and CC everyone included on this e-mail.
Please note that DEP has concurred with the attached plan, so you should be able to disregard the plan that you
independently coordinated.
Regards,
Ben
Richard B. Loyd
US Army Corps of Engineers
696 Virginia Road
Concord, MA 01742
Office: (978) 318-8048
Cell: (978) 763-5438
Richard.B.Loyd@usace.army.mil
1
CENAE-PDE 1 August 2022
FINAL Suitability Determination Addendum for the Town of Barnstable, MA
10-Year Comprehensive Dredge & Beach Nourishment Program, NAE-2015-
01632
Summary
This supplemental determination addresses the suitability of dredged material
from the proposed dredging of nine channels and basins in the Town of
Barnstable for beach nourishment as well as the suitability of dredged material
from the proposed dredging of one channel for unconfined open water disposal
at the Cape Cod Bay Disposal Site (CCBDS).The New England District (NAE) of
the U.S. Army Corps of Engineers (USACE) finds that sufficient data has been
provided to satisfy the evaluation and testing requirements of Section 404 of the
Clean Water Act (CWA). Based on an evaluation of the project and the material
proposed to be dredged, NAE finds the following channels suitable for beach
placement (Figures 1-5): Centerville River Spur Channel, Bumps River Channel,
Cotuit Bay Embayment Channel (-11ft MLW), West Bay Spur Channel, and
Prince Cove Entrance Channel. NAE also finds portions of the following channels
suitable for beach placement and portions of these channels unsuitable for
beach placement (Figures 1-5): Centerville River Upper Reach Channel, Cotuit
Bay Embayment Channel (-9ft MLW), West Bay Inner Entrance Channel, North
Bay Bay Street Channel, and the Prince Cove Marina Basin. The North Bay Bay
Street Channel is suitable for unconfined open water disposal at CCBDS (Figure
4).
1. Background
In April of 2020 NAE prepared a Sampling and Analysis Plan (SAP) for the Town
of Barnstable 10-year Comprehensive Dredge and Beach Nourishment Program
(NAE-2015-01632) and sampling was completed in April and May of 2020. The
project proposed dredging of several channels and basins in the Town of
Barnstable for beach nourishment. In September of 2020, NAE prepared a
suitability determination for the Town of Barnstable project (Final Suitability
Determination, Appendix I). The 2020 suitability determination concluded that
five of these channels met the exclusionary criteria under §230.60(a) and were
suitable for 10-year beach nourishment and four channels were suitable for one-
time beach placement (Table 1). Proposed dredge depths, project volumes, and
the 2020 finding for each area is shown in Table 1 and the conceptual site model
for each region is located in the Final Suitability Determination (Appendix I).
FINAL Suitability Determination Addendum for the Town of Barnstable, MA
10-Year Comprehensive Dredge & Beach Nourishment Program, NAE-2015-
01632
2
In March of 2021, NAE prepared a supplemental sampling and analysis plan
(supplemental SAP, Appendix II) to further evaluate several channels for beach
nourishment that did not meet the exclusionary criteria under §230.60(a) due to
grain size, location, or other characteristics that indicated there was a potential
for contamination. Additional sampling was also conducted to evaluate the
North Bay Bay Street Channel for offshore disposal at the CCBDS.
FINAL Suitability Determination Addendum for the Town of Barnstable, MA 10-Year Comprehensive Dredge & Beach Nourishment Program, NAE-2015-01632
3
Table 1: Summary of Proposed Dredge Areas and Placement Sites 2020
Waterway Project Area and Depth
(FT MLW) 2020 Finding Current Dredge
Footprint (Acres)
Current Dredge
Volume (CY) Proposed Placement Sites
Barnstable Harbor-Sandy Neck - Total Volume: 1,305 CY
Barnstable Harbor Entrance Channel: -6 suitable for 10-year beach
nourishment 2 1,305 Millway Beach, Sandy Neck
Public Beach
Centerville Harbor - Total Volume: 18,752 CY
East Bay Entrance Channel: -6 suitable for 10-year beach
nourishment 3.2 149
Long Beach, Craigville Beach,
Covell’s Beach
Centerville River
Lower Reach Channel: -6 suitable for one time beach placement
10.4 18,386
Upper Reach Channel: -6 additional testing
Spur Channel: -4 additional testing
Bumps River Channel: -4 additional testing 0.3 217
Three Bays - Total Volume: 155,768 CY
Cotuit Bay
Entrance Channel: -8 suitable for 10-year beach
nourishment
28.3 44,830
Dead Neck, Cross St. (Riley’s)
Beach, Ropes Beach
Embayment Channel: -7 suitable for one time beach placement
Embayment Channel: -9 additional testing
Embayment Channel: -
10
suitable for 10-year beach
nourishment
Embayment Channel: -
11 additional testing
Hoopers Landing: -6 not suitable
Town Landing: -3.5 not suitable
West Bay
Entrance Channel: -8 suitable for 10-year beach
nourishment
18.2 63,675
Inner Channel: -11 additional testing
Spur Channel: -8 additional testing
North Bay Narrows Channel: -8 suitable for one time beach placement 23.7 39,221
Bay St Channel: -6 additional testing
Seapuit River Channel -6 and -7 suitable for one time beach placement 7.4 8,042
Prince Cove - Total Volume: 12,748 CY
Prince Cove Entrance Channel: -6 additional testing 10.6 12,748 Dead Neck, Cross St. (Riley’s)
Beach, Ropes Beach
Marina Basin: -6 additional testing
Note: Areas shown in gray are not assessed in this suitability determination addendum
FINAL Suitability Determination Addendum for the Town of Barnstable, MA
10-Year Comprehensive Dredge & Beach Nourishment Program, NAE-2015-
01632
4
2. Sampling, Testing, and Analysis
The applicant collected dredge area sediment cores in August of 2021. The
reported sample locations and core lengths are presented in Table 2 and core
logs and photos are provided in Appendix III.
FINAL Suitability Determination Addendum for the Town of Barnstable, MA 10-Year Comprehensive Dredge & Beach
Nourishment Program, NAE-2015-01632
5
Table 2: 2021 Sampling Locations and Core Lengths
* TBR-WB-5A top sample taken from first attempt, bottom sample taken from second attempt
Station ID Longitude Latitude
Project
Depth
with
overdepth
(FT MLLW)
Water
Depth
(FT
MLLW)
Target
Core
Length
(FT)
Penetration
(FT)
Recovery
(FT)
Sample
Interval
(FT)
Grain
Size
Sample
Chemistry
Sample
CH-UR-1 -70.3566 41.6344 -7 -6.4 0.6 1.1 1.1 0-1.1 X
CH-UR-1R -70.3529 41.6358 -7 -5.7 1.3 1.3 1.3 0-0.5; 0.5-1.3 X
CH-UR-2R -70.3510 41.6370 -7 -4.5 2.5 2.6 2.4 0-1.2; 1.2-2.4 X
CH-UR-3R -70.3492 41.6370 -7 -2.8 4.2 4.2 4 0-1.3; 1.3-4.0 X
CH-S-1 -70.3452 41.6390 -5 -0.8 4.2 5.8 4.9 0-4.2 X
CH-S-2 -70.3472 41.6382 -5 -2.9 2.1 4.8 4.1 0-1.3; 1.3-2.1 X
CH-S-3 -70.3481 41.6374 -5 -4.8 0.2 2.3 2.1 0-0.3 X
CH-BR-1 -70.3577 41.6347 -5 -3.4 1.6 4.0 4 0-1.6 X
TBR-CB-5 -70.4302 41.6080 -12 -11.1 0.9 1.2 1.1 0-0.9 X
TBR-CB-7 -70.4273 41.6121 -10 -7.9 2.1 2.6 2.4 0-1.3; 1.3-2.2 X
TBR-NB-1 -70.3964 41.6194 -9 -7.6 1.4 1.5 1.3 0-1.3 X
TBR-NB-1A -70.3958 41.6201 -9 -7.6 1.4 2.3 2.3 0-1.4 X
TBR-NB-2 -70.3964 41.6220 -9 -5.6 3.4 4.5 4.1 0-3.4 X
TBR-NB-2A -70.3960 41.6249 -9 -7.2 1.8 2.0 1.6 0-1.6 X
TBR-NB-3 -70.3960 41.6246 -9 -7.5 1.5 1.9 1.5 0-1.5 X
TBR-NB-3A -70.3960 41.6273 -9 -7.4 1.6 2.8 2.1 0-1.6 X
TBR-NB-4 -70.3983 41.6287 -9 -6 3 3.1 2.8 0-2.7 X
TBR-NB-4A -70.4011 41.6300 -9 -7 2 2.2 2 0-2 X
TBR-NB-5 -70.4027 41.6305 -9 -5.7 3.3 3.7 3.4 0-3.4 X
TBR-WB-2 -70.4024 41.6083 -9 -8 1 1.0 0.8 0-0.8 X X
TBR-WB-3 -70.4008 41.6102 -12 -8.5 3.5 3.6 3.2 0-3.2 X
TBR-WB-4 -70.4004 41.6137 -12 -8.9 3.1 3.6 3.2 0-1.3; 1.3-3.2 X
TBR-WB-5 -70.4008 41.6166 -12 -8.8 3.2 3.3 2.8 0-0.9; 0.9-2.8 X
TBR-WB-5A* -70.4007 41.6178 -12 -8.1 3.9 4.1 3.3 0-2.5 X
TBR-WB-5A* -70.4007 41.6178 -12 -8.3 3.7 4.3 3.7 2.3-3.7 X
TBR-WB-6 -70.3996 41.6188 -12 -9 3 3.5 3 0-1; 1-3 X
PC-C-1 -70.4066 41.6366 -7 -6.5 0.5 1.4 1.3 0-1.2 X
PC-C-3 -70.4052 41.6400 -7 -3.1 3.9 4.1 3.8 0-1.8; 1.8-3.4 X
PC-C-5 -70.4077 41.6439 -7 -6.4 0.6 0.9 0.9 0-0.9 X
PC-B-1 -70.4095 41.6445 -7 -3.9 3.1 3.8 3.8 0-3.8 X
PC-B-4R -70.4109 41.6438 -7 -4.8 2.2 2.7 2.7 0-1.8; 1.8-2.2 X
PC-B-5R -70.4110 41.6448 -7 -5.2 1.8 2.7 2.7 0-2.7 X
FINAL Suitability Determination Addendum for the Town of Barnstable, MA
10-Year Comprehensive Dredge & Beach Nourishment Program, NAE-2015-
01632
6
3. Chemistry and Grain Size Testing Results 2021
The supplemental SAP called for selected samples to be analyzed for grain size
to further delineate silty areas while others were analyzed for chemistry to
evaluate suitability for beach placement or offshore disposal. For bulk sediment
chemistry analysis, the samples were analyzed for the standard suite of
contaminants specified in the Regional Implementation Manual for the
Evaluation of Dredged Material Proposed for Disposal in New England Waters
(RIM) (EPA/USACE, 2004), as no project specific contaminants of concern were
identified in the CSM.
To examine the sediment concentrations in an ecologically meaningful context,
NAE used Sediment Quality Guidelines (SQGs) to screen the chemical
concentrations found in the sediment samples from the Town of Barnstable.
Applicable SQG screening values for marine and estuarine sediments are the
National Oceanic and Atmospheric Administration (NOAA) effects-range low
(ERL) and effects-range median (ERM). It is important to understand that these
values were not derived as toxicity pass-fail thresholds. Rather, ERL and ERM
values are empirically derived guidelines based on a large number of studies
nationwide that identify contaminant levels that indicate probability of toxic
effects to inform decision making (Long et al., 1998). Effects are considered
unlikely at concentrations below the ERL with an increased probability of toxic
effects as concentrations increase. At concentrations above the ERM, toxic
effects are considered likely. For samples with sediment concentrations that fall
between the ERL and ERM levels, consideration is given to both the number of
contaminants that exceed ERL values and where the concentrations fall in the
range between ERL and ERM values in assessing the probability of toxic effects
and the potential need for additional testing.
In addition, applicable MassDEP screening values include the Massachusetts
Contingency Plan ([MCP] 310 CMR 40) “reportable concentrations soil-1” (RCS-
1) values which are for soils within 500 feet of a dwelling or recreational area and
the Similar Soils Provision Guidance ([SSPG], MassDEP 2014) RCS-1 values. The
SSPG Reporting Category RCS-1 applies to locations with the highest potential
for exposure, such as residences, playgrounds and schools, and to locations
within the boundaries of a groundwater resource area. The samples from the
Town of Barnstable project were compared to these values in addition to the
NOAA ERL and ERM in order to assess suitability for beach placement.
A summary of the grain size and bulk sediment chemistry results is discussed
FINAL Suitability Determination Addendum for the Town of Barnstable, MA
10-Year Comprehensive Dredge & Beach Nourishment Program, NAE-2015-
01632
7
by channel below. There were no exceedances of the MassDEP SSPG-RCS-1 or
MCP RCS-1 values. The full bulk chemistry results can be found in Appendix
IV.
Centerville Harbor: Centerville River Upper Reach Channel, Spur Channel, and
Bumps River Channel
Three cores were collected for grain size analysis and two individual cores and
one composite sample were collected for bulk chemistry analysis (Figure 1). The
grain size distributions, sediment color, and chemistry sample compositing
information are shown in Table 3.
Samples CH-UR-3R (0-1.3’ and 1.3-4.0’), CH-BR-1, CH-S-2 (A and B), and CH-
S-3 were composed of black, brown, and gray sand with less than 8% fines.
Samples CH-UR-1R (0-0.5’ and 0.5-1.3’), and CH-UR-1 were predominantly
black to gray sand with 10.5-14.6% fines. Sample CH-UR-2R was composed of
a light to dark gray sand in the top 1.2 feet but was composed of a brown silty
sand with 27.5% fines from 1.2-2.3 feet. All analyte concentrations in samples
CH-UR-1, CH-BR-1, and COMP-CH-S-1,2,3 were below the ERL. All pesticides
and polychlorinated biphenyls (PCBs) were non-detect in samples CH-UR-1 and
CH-BR-1.
The Long Beach, Craigville Beach, and Covell’s Beach nourishment area grab
samples were composed of fine to medium sand (Final SD, Appendix B)
FINAL Suitability Determination Addendum for the Town of Barnstable, MA 10-Year Comprehensive Dredge &
Beach Nourishment Program, NAE-2015-01632
8
Table 3. Grain Size Data Centerville Harbor
Year of Grain
Size Sample 2021 2020
Reach Upper Reach Channel
Bumps
River
Channel
Spur Channel
Sample ID
CH-UR-1R CH-UR-2R CH-UR-3R CH-
UR-1 CH-BR-1 CH-S-1
CH-S-2
CH-S-3 0-0.5' 0.5-
1.3' 0-1.2' 1.2-
2.3' 0-1.3' 1.3-4.0' CH-S-
2-A
CH-S-
2-B
Total Gravel 0.4 0.7 15.3 2.7 29.7 1.2 0 0 0 0 29.1 1.2
Coarse Sand 1.6 1.0 2.5 2.6 2.3 6.5 0.8 0.4 1.5 0.3 7.8 1.8
Medium Sand 28.6 35.9 37.3 30.0 50.1 83.9 38.3 22.7 59.9 26.2 39.8 69.1
Fine Sand 57.3 47.8 41.2 37.2 15.7 7.0 43.6 72.5 36.5 65.7 22.2 26.9
Total Fines 12.1 14.6 3.70 27.5 2.2 1.4 10.5 4.4 2.0 7.8 1.1 1.0
Color black black
to gray
light to
dark
gray
brown brown light gray gray to
black
medium
gray
light to
medium
gray
black gray
light to
medium
gray
Chemistry
Sample ID NA NA NA CH-
UR-1 CH-BR-1 COMP-CH-S-1,2,3
NA=not applicable
FINAL Suitability Determination Addendum for the Town of Barnstable, MA
10-Year Comprehensive Dredge & Beach Nourishment Program, NAE-2015-
01632
9
Three Bays Region: Cotuit Bay Embayment Channel
Two cores were collected from the Cotuit Bay Embayment Channel, one from the
-11ft MLW section and one from the -9ft MLW section, for bulk chemical analysis
(Figure 2). The grain size distributions, sediment color, and chemistry sample
compositing information are shown in Table 4.
Samples TBR-CB-5 and TBR-CB-7 were predominantly black to gray sand with
9-12.4% fines. All analyzed contaminants of concern (COCs) were below the ERL.
The associated Cross Street Beach nourishment area samples were composed of
medium and fine-medium sand. The Ropes Beach nourishment area samples
were composed of fine to medium sand and the Dead Neck Beach nourishment
area samples were composed of medium sand and sandy gravel (Final SD,
Appendix B).
Table 4. Grain Size Data Cotuit Bay Embayment Channel
Year of Grain
Size Sample 2020
Reach
Cotuit Bay
Embayment Channel
(-11 and -9 ft MLW)
Sample ID TRB-CB-5 TRB CB-7
Total Gravel 14.2 7.0
Coarse Sand 8.4 3.4
Medium Sand 24.3 36.7
Fine Sand 40.7 43.9
Total Fines 12.4 9.0
Color black/dark
gray black/gray
Chemistry
Sample ID COMP-TBR-CB-5,7
Three Bays Region: West Bay Spur and Inner Entrance Channel
Four cores were taken from the West Bay Spur and Inner Entrance channels for
grain size analysis, one core and one composite sample were analyzed for
chemistry (Figures 3). Two cores were taken at station TBR-WB-5A to achieve
sufficient volume for the sample. The grain size distributions, sediment color,
and chemistry sample compositing information are shown in Table 5.
FINAL Suitability Determination Addendum for the Town of Barnstable, MA
10-Year Comprehensive Dredge & Beach Nourishment Program, NAE-2015-
01632
10
Samples TBR-WB-2, TBR-WB-3, and TBR-WB-4 were composed of
predominantly black, dark gray, and tan sand with less than 6.2% fines. Samples
TBR-WB-5, TBR-WB-5A, and TBR-WB-6 were stratified with a tan or dark brown
sand in the bottom layer. Samples TBR-WB-5 and TBR-WB-5A had upper layers
composed of a black to dark gray silty sand with 22.1-32.5% fines. The upper
layer of sample TBR-WB-6 was a black sand with 14.6% fines. All analyzed COCs
in the composite sample COMP-TBR-WB-3,4 and sample TBR-WB-2 were below
the ERL.
Beach nourishment area grain size data can be found in the Final SD, Appendix
B.
Table 5. Grain Size Data West Bay Inner Entrance and Spur Channels
Year of Grain
Size Sample 2021 2020 2021
Reach Spur
Channel Inner Entrance Channel
Sample ID TBR-WB-
2
TRB-WB-
3
TRB-WB-
4
TBR-WB-5 TBR-WB-5A TBR-WB-6
0-0.9' 0.9-
2.8' 0-2.8' 2.3-
3.7' 0-1.0' 1.0-
3.0'
Total Gravel 2.5 3.9 24.6 6.3 4.6 0 3.8 4.5 3.0
Coarse Sand 0.8 6.9 4.8 2.0 2.3 2.9 2.7 2.9 4.3
Medium Sand 3.8 45.7 35.0 19.6 61.3 46.1 50.5 42.3 59.8
Fine Sand 86.7 39.3 32.9 50.0 29.0 18.5 37.3 35.5 31.6
Total Fines 6.2 4.2 2.7 22.1 2.80 32.5 5.70 14.8 1.3
Color black dark gray black
and tan black tan dark
gray
dark
brown black tan
Chemistry
Sample ID
TBR-WB-
2 COMP-TBR-3,4 NA NA NA NA NA NA
NA=Not Applicable
Three Bays Region: North Bay Bay Street Channel
One individual core and three composite samples were taken from the North Bay
Bay Street Channel for chemical analysis (Figure 4). The grain size distributions,
sediment color, and chemistry sample compositing information are shown in
Table 6.
Samples TBR-NB-2A, TBR-NB-3, TBR-NB-3A, TBR-NB-4, and TBR-NB-4A were
composed of dark gray to black sand with 3.5-10.1% fines. Samples TBR-NB-1
FINAL Suitability Determination Addendum for the Town of Barnstable, MA
10-Year Comprehensive Dredge & Beach Nourishment Program, NAE-2015-
01632
11
and TBR-NB-2 were composed of a black to gray silty sand with 17.7-38.6% fines
and samples TBR-NB-1A and TBR-NB-5 were predominantly black silt with 61.7-
90.1% fines. The concentrations of all analytes in the three composite samples
were below the ERL. Arsenic in sample TBR-NB-5 slightly exceeded the ERL but
was below the CCBDS reference value. All other analytes in sample TBR-NB-5
were below the ERL.
Beach nourishment area grain size data can be found in the Final SD, Appendix
B.
FINAL Suitability Determination Addendum for the Town of Barnstable, MA 10-Year Comprehensive Dredge &
Beach Nourishment Program, NAE-2015-01632
12
Table 6. Grain Size Data North Bay Bay Street Channel
Year of Grain
Size Sample 2020
Reach Bay Street Channel
Sample ID TBR-NB-
1
TBR-NB-
1A
TBR-NB-
2
TBR-NB-
2A
TBR-NB-
3
TBR-NB-
3A
TBR-NB-
4
TBR-NB-
4A
TBR-NB-
5
Total Gravel 11.6 7.4 2.7 0.9 2.4 4 9.8 8.6 0
Coarse Sand 11 5.5 5 4.2 4.7 4 5.5 5 1.3
Medium Sand 39.3 11.9 19.7 44.1 53.6 48.5 53.1 47.3 4.4
Fine Sand 20.4 13.5 34 44.8 32.5 35.8 28.1 29 4.2
Total Fines 17.7 61.7 38.6 6 6.8 7.7 3.5 10.1 90.1
Color black black medium
gray dark gray dark
gray dark gray
medium
to dark
gray
black black
Chemistry
Sample ID COMP-TBR-NB-1,1A,2 COMP-TBR-NB-2A,3 COMP-TBR-NB-3A,4,4A TBR-NB-
5
FINAL Suitability Determination Addendum for the Town of Barnstable, MA
10-Year Comprehensive Dredge & Beach Nourishment Program, NAE-2015-
01632
13
Prince Cove: Prince Cove Entrance Channel and Marina Basin
Two cores were collected for grain size analysis and one individual core and one
composite sample were collected for bulk chemistry analysis (Figure 5). The grain
size distributions, sediment color, and chemistry sample compositing
information are shown in Table 7.
Samples PC-C-1, PC-C-2, and PC-C-3 were composed of black to gray sand with
less than 4% fines. Samples PC-B-1 and the top 1.8’ of core PC-B-4R were
composed of black sand with 7.7-10.0% fines while the bottom 0.4 feet of core
PC-B-4R was composed of a light brown sand with 1.2% fines. Sample PC-B-5R
and the previously analyzed sample PC-B-3 were composed of black silt with
51.7-94.1% fines. Composite sample COMP-PC-C-1,3,5 had concentrations of all
analytes below the ERL. Sample PC-B-1 had arsenic, 4,4’-DDE, and total DDX
(sum 4,4’-DDD, 4,4’-DDE, 4,4’-DDT) concentrations slightly above the ERL.
Beach nourishment area grain size data can be found in the Final SD, Appendix
B.
Table 7. Grain Size Data Prince Cove Marina Basin
Year of Grain
Size Sample 2020 2021
Reach Entrance Channel Marina Basin
Sample ID PC-C-1 PC-C-3 PC-C-5 PC-B-1
PC-B-4R PC-B-
5R 0-1.8' 1.8-
2.2'
Total Gravel 10.0 32.9 1.3 11.8 3.7 0.4 0.0
Coarse Sand 3.9 8.9 1.7 2.3 3.8 2.0 1.9
Medium Sand 41.8 35.8 25.8 20.9 44.3 55.3 1.9
Fine Sand 40.9 20.8 67.2 57.3 38.2 41.1 2.1
Total Fines 3.4 1.6 4.0 7.7 10.0 1.2 94.1
Color black
gray/black
to light
gray
black black black light
brown black
Chemistry
Sample ID COMP-PC-C-1,3,5 PC-B-1 NA NA NA
FINAL Suitability Determination Addendum for the Town of Barnstable, MA
10-Year Comprehensive Dredge & Beach Nourishment Program, NAE-2015-
01632
14
4. Suitability Determination
Based on the weight of evidence including the conceptual site model, low-
moderate project risk ranking, grain size results, and consistently low sediment
chemistry results for these sediments, according to the testing and evaluation
requirements set forth in Section 404 of the Clean Water Act (CWA), NAE finds
the following:
Centerville Harbor: Centerville River Upper Reach Channel, Spur Channel, and
Bumps River Channel (Figure 1)
The Centerville River Spur Channel, Bumps River Channel, and portions of the
Centerville River Upper Reach Channel, represented by samples CH-UR-1, CH-
UR-1R and CH-UR-3R as well as the previously analyzed sample CH-UR-3, were
predominately composed of sand with low sediment chemistry results and are
suitable for one-time beach placement. The portions of the Centerville River
Upper Reach Channel represented by sample CH-UR-2R, as well as the
previously analyzed samples CH-UR-2, CH-UR-4, and CH-UR-5, were composed
of 22.9% to 86.8% fine grained material and are unsuitable for beach placement.
Three Bays Region: Cotuit Bay Embayment Channel (Figure 2)
The Cotuit Bay Embayment Channel -11ft MLW segment and the portion of the
Cotuit Bay Embayment Channel -9ft MLW segment represented by sample TBR-
CB-7, as well as the previously analyzed sample TBR-CB-8, were predominately
composed of sand with low sediment chemistry results and are suitable for one-
time beach placement. The portion of the Cotuit Bay Embayment Channel -9ft
MLW segment represented by the previously analyzed sample TBR-CB-7A
contained a higher percentage of fines and is unsuitable for beach placement.
Three Bays Region: West Bay Spur and Inner Entrance Channel (Figure 3)
The West Bay Spur channel and the portions of the West Bay Inner Entrance
Channel represented by samples TBR-WB-3, TBR-WB-4, and TBR-WB-6 were
composed predominantly of sand with low sediment chemistry results and are
suitable for one-time beach placement. The portion of the West Bay Inner
Entrance Channel represented by samples TBR-WB-5 and TBR-WB-5A had a
higher percentage of fines in the upper portion of each core and is unsuitable for
beach placement. The Seapuit River Channel and West Bay Entrance Channel
were found suitable for one-time beach placement and 10-year beach
nourishment, respectively, in the 2020 Final SD (Appendix I).
FINAL Suitability Determination Addendum for the Town of Barnstable, MA
10-Year Comprehensive Dredge & Beach Nourishment Program, NAE-2015-
01632
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Three Bays Region: North Bay Bay Street Channel (Figure 4)
The portion of the North Bay Bay Street channel represented by samples TBR-
NB-2A, TBR-NB-3, TBR-NB-3A, TBR-NB-4, and TBR-NB-4A was predominantly
composed of sand with low sediment chemistry results and is suitable for one-
time beach placement. The portions of the North Bay Bay Street Channel
represented by samples TBR-NB-1, TBR-NB-1A, TBR-NB-2, and TBR-NB-5
contained higher percentages of fines and are unsuitable for beach placement.
The sediments to be dredged from the North Bay Bay Street channel do not pose
an unacceptable risk to the environment and are considered suitable for
unconfined open water placement at CCBDS.
Prince Cove: Prince Cove Entrance Channel and Marina Basin (Figure 5)
The Prince Cove Entrance channel and portions of the Prince Cove Marina Basin
represented by samples PC-B-1, PC-B-4R, and the previously analyzed sample
PC-B-2 were predominately composed of sand with low sediment chemistry
results and are suitable for one-time beach placement. The portions of the Prince
Marina Basin represented sample PC-B-5R and the previously analyzed sample
PC-B-3 were predominantly fine grained and are unsuitable for beach placement.
FINAL Suitability Determination Addendum for the Town of Barnstable, MA
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The results of this determination are summarized in Table 8. The channels
evaluated in this addendum are not suitable for 10-year beach nourishment due
to the presence of fine-grained material within or adjacent to these channels and
the potential for finer grained material to accumulate in these depositional
environments..
Five years from the date of this Suitability Determination Addendum, a Tier One
project review by NAE will be required before additional dredging can take place.
This will include a review of spill records, updated hydrographic surveys, and
any changes in the project area to determine if the findings in this suitability
determination remain valid or if additional sampling and testing is required.
This suitability determination was coordinated with EPA Region 1 and MADEP.
MADEP concurred with the determination and EPA Region 1 conducted an
individual evaluation of the project and documented their findings in a separate
memo.
_________________________________ ________________________________
Sarah Turner
Geologist
Dredged Material Management Team
USACE-New England District
Lawrence Oliver
Chief
Environmental Branch
USACE-New England District
FINAL Suitability Determination Addendum for the Town of Barnstable, MA
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01632
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Table 8: Suitability Summary
Channel Decision Volume CY (with OD) Placement Area
Centerville Harbor
Centerville River
Upper Reach
Channel
Partially
suitable/partially
unsuitable for one
time beach placement
12,112
Long Beach
Craigville Beach
Covell’s Beach Centerville River
Spur Channel
suitable for one time
beach placement 2,518
Bumps River
Channel
suitable for one time
beach placement 217
Three Bays Region
Cotuit Embayment
Channel (-9 MLW)
Partially
suitable/partially
unsuitable for one
time beach placement
10,367
Dead Neck Beach
Cross St. (Riley's)
Beach
Ropes Beach
Cotuit Embayment
Channel (-11 MLW)
suitable for one time
beach placement 7,386
West Bay Spur
Channel
suitable for one time
beach placement 775
West Bay Inner
Entrance Channel
Partially
suitable/partially
unsuitable for one
time beach placement
62,100
Bay Street Channel
Partially
suitable/partially
unsuitable for one
time beach
placement; suitable
for CCBDS
30,507
Prince Cove
Prince Cove
Entrance Channel
suitable for one time
beach placement 9,014
Dead Neck Beach
Cross St. (Riley's)
Beach
Ropes Beach Prince Cove Marina
Basin
Partially
suitable/partially
unsuitable for one
time beach placement
3,734
FINAL Suitability Determination Addendum for the Town of Barnstable, MA
10-Year Comprehensive Dredge & Beach Nourishment Program, NAE-2015-
01632
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References:
EPA/USACE 2004. Regional Implementation Manual for the Evaluation of
Dredged Material Proposed for Disposal in New England Waters. U.S. EPA
Region 1, Boston, MA/U.S. Army Corps of Engineers, New England
District, Concord, MA.
EPA/USACE 1998. Evaluation of Dredged Material Proposed for Discharge in
Waters of the U.S.– Testing Manual. Environmental Protection Agency,
Office of Water and Department of the Army, United States Army Corps of
Engineers. Washington, D.C
Long E.R & MacDonald D.D. 1998. Recommended Uses of Empirically Derived,
Sediment Quality Guidelines for Marine and Estuarine Ecosystems,
Human and Ecological Risk Assessment: An International Journal, 4:5,
1019-1039.
19
20
Appendix I
2020 Suitability Determination
1
CENAE-PDE 14 September 2020
FINAL Suitability Determination for the Town of Barnstable, MA 10-Year
Comprehensive Dredge & Beach Nourishment Program, CENAE-2015-01632
Summary:
This determination addresses the suitability of dredged material from the
proposed dredging of 21 channels and basins in the Town of Barnstable for
beach nourishment. Based on Clean Water Act (CWA) 404(b)(1) guidelines the
New England District (NAE) of the US Army Corps of Engineers (USACE) finds
the sediments from five of these channels suitable for 10-year beach
nourishment and the sediments from four of the channels suitable for one-time
beach placement. The sediments from the remaining channels and basins are
unsuitable for beach nourishment but may be suitable for other disposal options
including, nearshore placement or open water disposal which will require
additional sampling and testing.
1. Project Description:
The Town of Barnstable is preparing a 10-year comprehensive plan for
maintenance dredging of the historically sandy portions of the town channels in
Barnstable Harbor, Centerville Harbor, the Three Bays Region, and Prince Cove
(Figure 1). Suitable sandy material from these areas will be used to nourish
beaches in the vicinity of each project (see Table 1 and Figures 2-5). The current
plan for the 2020 dredge cycle includes the removal of approximately 188, 573
cubic yards (CY) of predominantly sandy material from shoals totaling 104 acres
across the four project areas. All project areas will be hydraulically dredged by
the Barnstable County Dredge (BCD) to the various permitted depths plus one
foot of allowable overdepth. Suitable sandy material will be placed across the 10
identified shoreline areas described in the sections below for the purpose of
beach nourishment. The upland placement action proposed in the vicinity of
Sandy Neck will not be evaluated in this determination as this site is not
regulated under Section 404 of the CWA. A summary of the proposed dredge
areas, volumes, depths, and proposed nourishment sites is presented by project
area and waterway in Table 1.
2. Conceptual Site Model:
NAE reviewed historic testing data, previous environmental assessments, water
quality data, and adjacent land-use information to develop a conceptual site
model (CSM) for each of the dredge areas specified in the Barnstable 10-Year
Comprehensive Dredge & Beach Nourishment Program. This CSM was used to
FINAL Suitability Determination for the Barnstable, MA 10-Year
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2
contamination, site-specific contaminants of concern, exposure pathways, and
biological receptors in order to inform this suitability determination.
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4
Table 1: Summary of Proposed Dredge Areas and Placement Sites 2020
Waterway Project Area and Depth
(FT MLW)
Current Dredge
Footprint (Acres)
Current Dredge
Volume (CY) Proposed Placement Sites
Barnstable Harbor-Sandy Neck - Total Volume: 1,305 CY
Barnstable Harbor Entrance Channel: -6 2 1, 305
Millway Beach
Sandy Neck Public Beach
Centerville Harbor - Total Volume: 18,752 CY
East Bay Entrance Channel: -6 3.2 149
Long Beach
Craigville Beach
Covell’s Beach
Centerville River Main Channel:-6
Spur Channel: -4 10.4 18, 386
Bumps River Channel: -4 0.3 217
Three Bays - Total Volume: 155,649 CY
Cotuit Bay
Entrance Channel: -8
Embayment Channel: -7,-9,-10,-11
Hoopers Landing: -6
Town Landing: -3.5
28.3 44,830
Dead Neck
Cross St. (Riley’s) Beach
Ropes Beach
West Bay
Entrance Channel: -8
Inner Channel: -11
Spur Channel: -8
18.2 63,657
North Bay Narrows Channel: -8
Bay St Channel: -6 23.7 38,681
Seapuit River Channel -6 and -7 7.4 8,042
Prince Cove - Total Volume: 12,748 CY
Prince Cove Entrance Channel: -6
Marina Channel and Basin: -6 10.6 12,748
Dead Neck
Cross St. (Riley’s) Beach
Ropes Beach
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Barnstable Harbor – Sandy Neck: Barnstable Harbor, located approximately 10
miles east of the Cape Cod Canal entrance, is a natural harbor on the northern
shore of Cape Cod. The harbor is home to a small recreational and commercial
fishing fleet and is a popular destination for transient boaters. Access to the inner
harbor is facilitated by a 6 foot deep (MLW), 60 foot wide channel that extends
approximately 0.2 miles from deep water to the head of navigation along the town
waterfront. Waterfront facilities include a Town Marina with 88 slips, fuel docks,
parking, a public boat ramp, and several commercial marine service centers.
The Sandy Neck Barrier Beach System shelters the north and northwest portion
of Barnstable Harbor and was designated as an Area of Critical Environmental
Concern (ACEC) in 1978 by the state due to the natural resources, wildlife,
endangered species, and recreational opportunities found on site. Several
residential properties are located on the southeast end of the Sandy Neck
Peninsula.
Water quality in the vicinity of Barnstable Harbor is dictated by tidal exchange
with Cape Cod Bay to the north and freshwater input from several small creeks
and streams to the south and west. The Commonwealth of Massachusetts
designates the waters of Barnstable Harbor as Class SA (314 CMR 4.06). Class
SA waters are considered excellent habitat for fish, other aquatic life, and
wildlife, and are suitable for shellfish harvesting and for primary and secondary
contact recreation (MassDEP 2018).
The Barnstable Harbor channel requires periodic maintenance dredging in order
to maintain a safe and navigable waterway. The outer entrance channel was last
dredged by the Town in 2017 when 8,226 cubic yards of sand was hydraulically
removed and placed along Millway Beach, Sandy Neck Public Beach, and in the
Sandy Cottage area for beach nourishment. Sediment sampling and testing of
the outer entrance channel performed in 2014 documented the material as
predominantly coarse grained (93-98% sand and gravel). Dredging activities
within Barnstable Harbor under the 10-year plan will be limited to the outer-
most ±1,125 linear feet of the channel as this area has historically contained
coarse grained sediments suitable for beach nourishment.
Based on a review of available data and communication with local officials NAE
determined that there has been one documented spill of gasoline (4-6 gallons) off
of Salten Point, approximately 800 feet west of the dredge site. There are 2 known
outfalls along the Barnstable harbor waterfront and 5 documented outfalls along
Mill Creek, a tributary to the harbor. Following this tier one review of the site
characteristics and the available historical data, the entrance channel of
Barnstable Harbor was given a low-moderate risk ranking according to the
following matrix (Table 2, adapted from USACE 2018):
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Table 2. Project Risk Ranking
Rank Guidelines
Low Few or no sources of contamination. Data available to verify no
significant potential for adverse biological effects.
Low-Moderate Few or no sources of contamination but existing data is insufficient
to confirm ranking.
Moderate
Contamination sources exist within the vicinity of the project with
the potential to produce chemical concentrations that may cause
adverse biological effects.
High
Known sources of contamination within the project area and
historical data exists that has previously failed biological testing.
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FINAL Suitability Determination for the Barnstable, MA 10-Year
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Centerville Harbor: The Centerville Harbor region is located on the south side
of Barnstable, approximately 3.5 miles west of the village of Hyannis. Navigable
waterways within this region include the East Bay, Centerville River, and the
Bumps River. The Bumps River and Centerville River both flow into the East Bay
which empties into Nantucket Sound. The East Bay entrance channel is 6 feet
deep (MLW), 0.4 miles long, and is flanked by Dowses Point to the west and Long
Beach to the East. A stone jetty extends along the western shoreline at Dowses
Point and provides stabilization to the East Bay Entrance channel. The
Centerville River includes a 7 foot deep (MLW), 0.7 mile long lower reach channel;
a 6 foot deep (MLW), 0.75 mile long upper reach channel; and 4 foot deep (MLW),
0.3 mile long spur channel. The Bumps River channel is 4 feet deep (MLW) and
extends 0.07 miles upstream to a point between two residential neighborhoods.
The East Bay-Centerville River system is an active waterfront that supports
recreational boating activities, two public landings, and several private docks
and piers. The Town of Barnstable manages a few dozen moorings within the
Centerville River. Other land use in the area is a mix of low to moderate density
residential properties along the northern and southern waterfront, and public
recreation areas to the south along Nantucket Sound. The upstream portion of
the Centerville River is bounded by an extensive system of salt marshes. Two
public beaches, Long Beach and Craigville Beach, are located adjacent to the
Centerville River channel.
Water quality in the vicinity of Centerville Harbor is dictated by tidal exchange
with Nantucket Sound to the south and freshwater input from the Centerville
River and Bumps River to the north. The Commonwealth of Massachusetts
designates the waters of Centerville Harbor as Class SA (314 CMR 4.06). Class
SA waters are considered excellent habitat for fish, other aquatic life, and wildlife
and are suitable for shellfish harvesting and for primary and secondary contact
recreation (MassDEP 2018).
Projects within the Centerville Harbor Region were most recently dredged
between 2003 and 2014 and the material was placed along Dowses Beach, Long
Beach, and Craigville Beach for nourishment.
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Table 3: Centerville Harbor Region Dredge History
Project Area
Project
Depth
(FT MLW)
Dredged
By
Date Last
Dredged
Material
Removed
(CY)
Material
Type
Centerville
River Upper
Reach, Spur,
and Bumps
River Channel
-6, -4, -4 Town 2006 25,000 Sandy and
Silty
Centerville
River Lower
Reach Channel
-7 Town 2003 40,700 Sandy
East Bay
Entrance
Channel
-6 Town 2013-2014 9,569 Sandy
There is limited data available for the Centerville Harbor Region project areas.
Sampling and testing of 20 sediment samples from the Centerville River channel
performed between 1999 and 2000 documented that the material from 8 of the
samples contained 15% or more silt and clay. The remaining samples contained
between 86.34 and 98.44% sand and gravel. Sampling and testing of 20
sediment samples from East Bay in 2012 found the material throughout the
waterway to be predominantly sand and gravel (93-98%).
Based on a review of available data and communication with local officials NAE
determined that a total of 5 oil spill incidents were reported to MA DEP within
the vicinity of existing outfalls that could have resulted into a related discharge
into East Bay, Centerville River and/or the Bumps River. There are 18 town
documented outfalls that occur within the vicinity of the Centerville Harbor area:
2 outfalls are located along the waterfront of the Centerville River lower reach
channel, 2 outfalls are located along the waterfront of the Centerville River spur
channel, 2 outfalls are located along the waterfront of the Bumps River channel,
and 1 outfall is located along a direct tributary to the Centerville River. Following
this tier one review of the site characteristics and the available historical data,
the Centerville Harbor region was given a low-moderate risk ranking.
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Three Bays: The Three Bays Region in Barnstable consists of a large and
complex estuary system with multiple inlets and sub-embayment’s situated
along the northern shore of Nantucket Sound. Cotuit Bay and West Bay each
connect Nantucket Sound with North Bay. The Seapuit River connects Cotuit
Bay and West Bay, and separates Grand Island and Dead Neck Island. North
Bay is the smallest of the Three Bays and West Bay is formed largely by the
enclosure of Little Island and Oyster Harbors to the north and west. Cotuit Bay
includes an 8 foot deep (MLW), 0.6 mile long entrance channel; a 1.15 mile long
embayment channel which varies from 7 to 11 feet in depth (MLW); a 2.5 and
4.5 foot deep (MLW) basin at the Cotuit Town Landing; and a 6 foot deep (MLW),
0.07 mile long channel in the vicinity of Hoopers Landing. North Bay is connected
to Cotuit Bay by the 8 foot deep (MLW), 0.7 mile long “Narrows” channel; and to
West Bay by the 6 foot deep (MLW), 0.5 mile long “Bay Street” channel. West Bay
includes an 8 foot deep (MLW), 0.6 mile long outer entrance channel; an 11 foot
deep (MLW), 0.7 long inner entrance channel; and an 8 foot deep (MLW), 0.1 mile
long spur channel. The Cotuit Bay embayment channel and the West Bay spur
channel are connected to each other by the 7 foot deep (MLW), 0.17 mile long
Seapuit River channel.
The Three Bay system supports a variety of water dependent uses that meet local
recreational, transient and commercial boating needs. There are 5 public access
boat ramps located within the Three Bays as well as several privately owned boat
yards, marinas, and other marine service facilities. Land use along the waterfront
is a mix of residential properties, small commercial developments, and two golf
courses. Dead Neck Island consists of Oyster Harbor Beach and the Mass
Audubon Sampsons Island Wildlife Sanctuary.
Water quality in the Three Bays area is dictated by tidal exchange with Nantucket
Sound to the south and freshwater input from the Marstons Mill River located
upstream from North Bay. The Commonwealth of Massachusetts designates the
waters of the Three Bays area as Class SA (314 CMR 4.06). Class SA waters are
considered excellent habitat for fish, other aquatic life, and wildlife and are
suitable for shellfish harvesting and for primary and secondary contact
recreation (MassDEP 2018).
Projects within the Three Bays Region were most recently dredged between 1940
and 2010 and the material was placed along Dead Neck Beach for beach
nourishment:
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Comprehensive Dredge & Beach Nourishment Program, CENAE-2015-01632
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Table 4: Three Bays Region Dredge History
Project Area
Project
Depth
(FT
MLW)
Dredged By
Date
Last
Dredged
Material
Removed
(CY)
Material
Type
Cotuit Bay
Entrance
Channel
-8 Three Bays
Preservation 1998 15,850 Sandy
Cotuit
Embayment
Channel
-7, -8, -
9, -10
Three Bays
Preservation 1998 15,850 Sandy
Cotuit
Embayment
Channel
-10 Three Bays
Preservation 2002 No Data Sandy
Cotuit Town
Landing
-2.5, -
4.5 Town 2010 850 Sandy
Hoopers
Landing basin -6 State 1940 No Data Sandy
Seapuit River
Channel -7 State 1955 No Data Sandy
West Bay
Entrance
Channel
-8 State 1981 No Data Sandy
North Bay
“Narrows”
Channel
-8 State 1971 No Data Sandy
North Bay
“Bay Street”
Channel
-6 State 1982 No Data Sandy
Sediment sampling and testing performed by the Three Bays Preservation in
2009 documented the material in the entrance channel to Cotuit Bay as sand
and gravel with less than 1% fine grained material. Sediment sampling and
testing performed by the Three Bays Preservation in 2007 documented the
material from the North Bay region to be predominately sand and gravel with
less than 1% fine grained material.
Based on a review of available data and communication with local officials NAE
determined that there have been 14 documented fuel spills or incidents involving
an unknown sheen reported to the National Response Center (NRC) and 15 oil
spill incidents reported to MA DEP within Cotuit Bay, North Bay, and West Bay
between 1996 and 2014. The Harbormaster’s office reported an oil spill in 2003
from Crosby’s Yacht Yard, located to the north of the Bridge Street Bridge in
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North Bay. In 2008 a hazardous spill with reported elevated concentrations of
benzene and aliphatic hydrocarbons occurred at 905 Main Street on the western
side of Cotuit Bay. There are 18 town outfalls located throughout the three Bays
Region: 6 outfalls are located along the waterfront in Cotuit Bay and 5 outfalls
along the waterfront in West Bay. Following this tier one review of the site
characteristics and the available historical data, the Three Bays region was given
a low-moderate risk ranking.
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Prince Cove: Prince Cove is connected to North Bay and the Three Bays system
by an entrance channel in the Mill River. Prince Cove includes a 6 foot deep
(MLW), 0.8 miles long entrance channel, and a 6 foot deep (MLW) basin. The
Prince Cove Marina facility is located at the entrance of the cove and has been
owned and operated by the town since 2002. The marina provides public access
to the cove as well as slips for approximately 36 vessels, with 100 moorings
located within the cove directly seaward and to the south of the docks. A public
boat ramp is located on the north side of the marina. Other land use along the
waterfront is primarily private residences and docks.
Water quality in the vicinity of Prince Cove is dictated by tidal exchange with the
Nantucket Sound through the Three Bays system and freshwater input from the
Marstons Mill River. The Commonwealth of Massachusetts designates the waters
of the Three Bays area as Class SA (314 CMR 4.06). Class SA waters are
considered excellent habitat for fish, other aquatic life, and wildlife and are
suitable for shellfish harvesting and for primary and secondary contact
recreation (MassDEP 2018).
Prince Cove was last dredged in 1956 when approximately 12,750 CY of sandy
material was removed from the 6 foot channel and basin. The record plans for
this effort did not identify a disposal/reuse site for sediments or previous
sampling records.
Based on a review of available data and communication with local officials NAE
determined that there has been 1 reported incident involving an oily sheen
documented by the NRC in the vicinity of the Prince Cove Marina in 2009 and 1
incident involving an oily sheen reported to MA DEP in the vicinity of Prince Cove
in 2002. There are 5 documented outfalls surrounding the Prince Cove area,
none are located along the waterfront. Following this tier one review of the site
characteristics and the available historical data, the Prince Cove region was given
a low-moderate risk ranking.
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3. Sampling, Testing, and Analysis:
NAE prepared a sampling and analysis plan (SAP) for the project on 8 April 2020.
The SAP called for 57 sediment cores to be collected from all of the proposed
dredge areas and 24 grab samples to be collected from the proposed beach
placement areas. Sixty-eight core samples and 27 beach grab samples were
collected in April and May of 2020. The additional cores were taken to better
delineate silty areas identified in the field and the additional beach grabs were
taken to ensure representative sampling of the placement sites. Core logs are
provided in Appendix A and the beach grab sample grain size distributions are
provided in Tables B1 and B2 in Appendix B. Dredge area grain size data is
summarized by geographic region in the following sections.
Barnstable Harbor: Two samples were taken from the Barnstable Harbor
Entrance Channel, the grain size distribution and material description is shown
in Table 5 (Figure 6). Sample BH-1 was composed of a light grey/tan medium-
fine sand with only 1.1% fines while sample BH-2 had approximately 10% fines.
The Sandy Neck Public Beach and Millway Beach placement sites were composed
of fine-medium sand and medium sand respectively (Figure 7 and Appendix B).
Table 5: Barnstable Harbor
Grain Size % BH-1 BH-2
Total Gravel 0.1 U 0.1 U
Coarse Sand 1.3 0.3
Medium Sand 40.7 3
Fine Sand 56.9 86.2
Total Fines 1.1 10.5
Description
light
grey/tan
sand with
trace silt
dark grey
silty sand
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FINAL Suitability Determination for the Barnstable, MA 10-Year
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FINAL Suitability Determination for the Barnstable, MA 10-Year
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Centerville Harbor: Seventeen samples were taken from the five channels in
Centerville Harbor (Figures 8 and 9). The grain size distributions and material
descriptions are shown in Tables 6-7. The East Bay Entrance Channel,
represented by samples CH-EB-1 and CH-EB-2, was composed of a light
grey/tan medium-fine sand with less than 2% fines. The lower part of the
Centerville Harbor Lower Reach Channel (CH-LR-1 to CH-LR-3) was composed
of grey fine-medium sand with less than 7% fines and some shells. Samples CH-
LR-4 and CH-BR-1 were composed of a black/dark grey medium fine sand with
more silt at the top of each core. The Centerville Harbor Upper Reach Channel
samples (CH-UR-1 to CH-UR-5) were composed mainly of black organic silt and
silty sand as well as some coarser grained material at CH-UR-3. The Centerville
Spur Channel was composed of a dark grey fine-medium sand with a layer of silt
in the top ~1.5ft of core CH-S-2, which was vertically subsampled into sample
CH-2-2A (upper 1.3ft) and CH-2-2B (bottom 1ft) (Appendix A). The Long Beach,
Craigville Beach, and Covell’s Beach nourishment area grab samples were
composed of fine-medium sand (Figure 10 and Appendix B).
Table 6: Centerville Harbor East Bay Entrance, Lower Reach, Bumps River
Grain Size % CH-EB-1 CH-EB-2 CH-LR-1A CH-LR-1 CH-LR-2 CH-LR-3 CH-LR-4 CH-BR-1
Total Gravel 0.7 0.1 U 3.1 10.2 2.5 1.2 2.5 0.1 U
Coarse Sand 0.7 4.5 5.2 8.2 2.7 4.5 1.6 0.4
Medium Sand 21.8 43.8 56.5 42.2 42.2 48.2 33.2 22.7
Fine Sand 75.9 42.3 32.9 35.2 46.8 39.4 59.2 72.5
Total Fines 0.9 1.5 2.3 4.2 5.8 6.7 3.5 4.4
Description
light
grey/tan
medium
fine sand
grey/tan
coarse
sand
grey
coarse
sand
dark
grey mud
mixed
with
sand
light
grey
coarse
sand w/
trace
fines on
top
grey
medium
grain
sand,
some
shell
black
dark grey
mud
then
sand
w/shell
black
dark grey
mud
mixed w/
sand and
trace
shell
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Table 7: Centerville Harbor Upper Reach and Spur Channels
Grain Size % CH-UR-1 CH-UR-2 CH-UR-3 CH-UR-4 CH-UR-5 CH-S-1
CH-S-2
CH-S-3 CH-S-2-
A
CH-S-2-
B
Total Gravel 0.1 U 0.1 U 0.1 U 0.6 0.6 0.1 0.1 U 29.1 1.2
Coarse Sand 0.8 7.1 7.5 3.1 2.6 1.5 0.3 7.8 1.8
Medium Sand 38.3 2.3 38.6 25.7 5.8 59.9 26.2 39.8 69.1
Fine Sand 43.6 45.3 18.7 47.7 4.2 36.5 65.7 22.2 26.9
Total Fines 10.5 45.3 1.4 22.9 86.8 2 7.8 1.1 1
Description
grey, thin
top layer
of silt,
grey sand
w/some
silt
black
mud,
wood
debris,
trace
sand
brown
sand w/
cobble,
trace silt
light to
medium
grey silty
sand
black
mud
med.
grey
med.
sand,
some
fines
dark
grey
peat/bla
ck mud
on top of
sand
grey/tan
med.
coarse
sand
brown
tan
mediu
m to
coarse
sand
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FINAL Suitability Determination for the Barnstable, MA 10-Year
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Three Bays Region: Forty-four samples were taken from the 10 dredge areas in
the Three Bays Region. The grain size distributions and material descriptions are
shown in Tables 8-14. The Cotuit Entrance Channel and the Embayment
Channel (Figure 11), samples TBR-CB-1 and TBR-CB-2, was composed of fine-
medium and medium-fine grey/brown sand. The Cotuit -10ft MLW Embayment
Channel, represented by sample TBR-CB-3, was also composed of a fine-medium
grey/tan sand. The Cotuit Embayment Channel -11 and -9 ft MLW sections
(samples TBR-CB-4 to TBR-CB-8) were composed of a mixture of grey/tan to
black medium fine sand with pockets of black silt in the upper layers of cores
TBR-CB-5, 7 and 7A. Sample TBR-7A was vertically subsampled into sample
TBR-7A-A (upper 1.3ft) and TBR-7A-B (bottom 1.8ft). The Cotuit Embayment -7
MLW Channel was composed of a dark grey fine-medium sand with little fines.
The Seapuit River Channel (Figure 12, samples TBR-SR-1 to TBR-SR-6) was
composed of a dark grey to tan fine and medium sand, with some fines in the
upper portion of TBR-SR-6.
The West Bay Outer Entrance Channel (Figure 13), represented by sample TBR-
WB-1, was composed of dark brown medium sand and some gravel sized
material, likely shell hash. The dredge interval from the West Bay Spur Channel,
represented by sample TBR-WB-2, was composed of black organic silt. An
additional sample was taken, TBR-WB-2A, which was composed of light gray
sand. The West Bay Inner Entrance Channel (samples TBR-WB-3 to TBR-WB-6)
was composed of dark grey and brown fine and medium sand with black silt
concentrated at the top of cores TBR-WB-5 and 6 and almost 30% fines in sample
TBR-WB-5A.
The Bay Street Channel, samples TBR-NB-1 to TBR-NB-5, was composed of
black organic silt and dark grey silt and sand. The North Bay Narrows Channel,
samples TBR-NB-6 to TBR-NB-9, was composed of a grey/tan fine-medium sand
(Figure 14).
Two samples were taken from the Hoopers Town Landing dredge area (Figure
15). Sample TBR-HL-1 was stratified and two vertical subsamples were taken.
TBR-HL-1-A was composed of black silt and sand from the top ~15 inches with
grey/brown sand below (sample TBR-HL-1-B). Sample TBR-HL-2 was composed
of black organic silt.
The Cotuit Town Landing (Figure 16), represented by samples TBR-CTL-1 and
TBR-CTL-2, was composed of a layer of black organic silt over fine sand.
Subsamples were not taken from the separate layers and therefore the grain size
distribution shown in Table 14 is not representative of the individual strata.
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The Cross Street Beach nourishment area samples were composed of medium
and fine-medium sand. The Ropes Beach nourishment area samples were
composed of fine-medium sand and the Dead Neck Beach nourishment area
samples were composed of medium sand and sandy gravel (Figure 17 and
Appendix B).
Table 8: Cotuit Bay Entrance and Embayment Channels
Grain Size % TBR-CB-1 TBR-CB-2 TRB-CB-3 TRB-CB-4 TRB-CB-5 TRB-CB-5A TRB-CB-6
Total Gravel 7.3 0.3 0.1 U 1.9 14.2 7.7 5.2
Coarse Sand 5.7 0.8 1.4 1.5 8.4 1.8 4.3
Medium Sand 46.3 25.8 67.8 46 24.3 49.3 38.7
Fine Sand 36.9 67.9 29.6 45.5 40.7 37.9 47.6
Total Fines 3.8 5.2 1.2 5.1 12.4 3.3 4.2
Description
brown
grey med.
sand w/
some
fines
brown
tan med.
fine sand
grey tan
coarse
sand
grey tan
coarse
sand with
some silt
grey
muddy
sand w/
some shell
grey med.
Fine sand,
some silt
dark grey
muddy
sand,
trace shell
Table 9: Cotuit Bay Embayment Channel
Grain Size % TRB CB-7
TBR-CB-7A
TRB CB-8 TRB CB-9 TBR-CB-
7A-A
TBR-CB-
7A-B
Total Gravel 7 10.3 2.2 2.5 3.1
Coarse Sand 3.4 23.1 1.8 0.8 2.5
Medium
Sand 36.7 22.6 22.1 8.5 57.3
Fine Sand 43.9 17.4 70.7 79.2 33.5
Total Fines 9 26.6 3.2 9 3.6
Description
grey sand
w/ mud
and shell
black mud tan med.
fine sand
tan med.
fine sand
dark grey
mud
mixed w/
sand
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Table 10: Three Bays Region Seapuit River Channel
Grain Size % TRB-SR-1 TRB-SR-2 TRB-SR-3 TRB-SR-4 TRB-SR-5 TRB-SR-6
Total Gravel 15.7 1.4 1 1.1 0.7 0.1
Coarse Sand 8 4.1 1.2 3.2 1.5 0.5
Medium Sand 46.1 50.1 43.7 45.9 50.3 36.5
Fine Sand 26.6 39.7 47.5 47.6 45.9 58.5
Total Fines 3.6 4.7 6.6 2.2 1.6 4.4
Description
grey tan
med. sand
w/some
shell
light grey
med. sand
dark grey
fine sand
some shell
grey/tan
med.
coarse
sand
tan med.
sand
grey/brown
med. sand
some silt
Table 11: West Bay Outer and Inner Entrance and Spur Channels
Grain Size % TRB-WB-1 TRB-WB-2 TRB-WB-2A TRB-WB-3 TRB-WB-4 TRB-WB-5 TBR-WB-5A TBR-WB-6
Total Gravel 33.9 7 0.1 3.9 24.6 4 0.6 6.8
Coarse Sand 13.3 2.2 0.1 U 6.9 4.8 3 2.4 2.4
Medium
Sand 32.1 6.5 1.3 45.7 35 48 29.9 42
Fine Sand 19.7 79 96.2 39.3 32.9 36.6 39 39.2
Total Fines 1 5.3 2.4 4.2 2.7 8.4 28.1 9.6
Description
dark
brown
coarse
sand
some mud
and shell
black
silt/fines
light grey
fine sand
and silt
sand w/
some shell
and fines
coarse
sand w/
some mud
grey
brown
mostly
sand and
some mud
black/grey mud and sand
dark grey mud and sand
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Table 12: Three Bays Region Bay Street Channel
Grain Size %
TBR-
NB-1
TBR-
NB-1A
TBR-
NB-2
TBR-
NB-2A
TBR-
NB-3
TBR-
NB-3A
TBR-
NB-4
TBR-
NB-4A
TBR-
NB-5
Total Gravel 11.6 7.4 2.7 0.9 2.4 4 9.8 8.6 0.1 U
Coarse Sand 11 5.5 5 4.2 4.7 4 5.5 5 1.3
Medium Sand 39.3 11.9 19.7 44.1 53.6 48.5 53.1 47.3 4.4
Fine Sand 20.4 13.5 34 44.8 32.5 35.8 28.1 29 4.2
Total Fines 17.7 61.7 38.6 6 6.8 7.7 3.5 10.1 90.1
Description
dark
grey
muddy
coarse
sand
w/
some
cobble
grey
mud,
clay
shell
and
some
fine
sand
thick
black
clay
grey
mud
mixed
with
coarse
sand
black
silty
muddy
sand
black
mud
and
sand w/
shell
medium
to
coarse
sand
with
trace
shell
black
grey
mud,
some
shell
black
mud
Table 13: Three Bays Region North Bay Narrows
Grain Size % TBR-NB-6 TBR-NB-7 TBR-NB-8 TBR-NB-9
Total Gravel 8.6 0.6 0.7 6.3
Coarse Sand 7.7 2.1 4 8.4
Medium Sand 51.9 37.5 53.8 50
Fine Sand 28.8 57.8 40.5 33.1
Total Fines 3 2 1 2.2
Description
grey brown
coarse sand
w/ silt
grey/tan
med.
coarse
sand
grey/tan
med.
coarse
sand,
trace shell
grey/tan
med.
coarse
sand,
trace shell
Table 14: Hoopers Landing and Cotuit Town Landing
Grain Size %
TBR-HL-1
TBR-HL-2 TBR-CTL-
1 TBR-CTL-2 TBR-HL-
1-A
TBR-HL-
1-B
Total Gravel 1.4 3.8 3.8 1.4 1
Coarse Sand 2.3 4.4 5.7 2.8 3.3
Medium
Sand 33.6 50 11.5 9.9 17.7
Fine Sand 35.2 36.2 7.4 68.1 70.6
Total Fines 27.5 5.6 71.6 17.8 7.4
Description
thick
black
mud and
clay
tan coarse
sand
some
cobble
thick
black
mud and
clay
black
mud, fines
black
mud, fine
sand
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FINAL Suitability Determination for the Barnstable, MA 10-Year
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FINAL Suitability Determination for the Barnstable, MA 10-Year
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FINAL Suitability Determination for the Barnstable, MA 10-Year
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FINAL Suitability Determination for the Barnstable, MA 10-Year
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FINAL Suitability Determination for the Barnstable, MA 10-Year
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Prince Cove: Eight samples were taken from the two dredge areas in Prince Cove
(Figure 18). The grain size distributions and material descriptions are shown in
Table 15. The Prince Cove Entrance Channel, samples PC-C-1 to PC-C-5, was
composed of dark grey silty sand, with the fines concentrated in the upper part
of the cores. The dredge interval from sample PC-C-5 consisted of a layer of black
organic silt. The Prince Cove Marina Basin was composed of dark grey/back silty
sand and black organic silt at stations PC-B-1 and PC-B-3. While sample PC-B-
2 was composed of tan medium sand.
Table 15: Prince Cove Entrance Channel and Marina Basin
Grain Size % PC-C-1 PC-C-2 PC-C-3 PC-C-4 PC-C-5 PC-B-1 PC-B-2 PC-B-3
Total Gravel 10 0.1 U 32.9 10.1 1.3 11.8 6.6 2.7
Coarse Sand 3.9 3.6 8.9 4.1 1.7 2.3 3.8 19.1
Medium Sand 41.8 58 35.8 35 25.8 20.9 57.7 18.7
Fine Sand 40.9 37.4 20.8 48.4 67.2 57.3 30.8 7.8
Total Fines 3.4 1 1.6 2.4 4 7.7 1.1 51.7
Description
brown
grey
mud,
sand,
shells
dark
grey
sand
with
some
mud and
shell
dark
grey
mud,
sand,
small
cobble
dark
grey
mud,
sand,
shell
black
mud
dark
grey
mud,
clay w/
shell
tan
coarse
sand
w/
small
cobble
black
mud
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4. Suitability Determination:
The disposal of sediments at the proposed placement areas is regulated under
Section 404 of the Clean Water Act. Under §230.60, General Evaluation of
Dredged or Fill Material, further testing of the dredged material is not necessary
if the material is not considered a carrier of contaminants. According to
§230.60(a) the proposed dredged material is most likely free from pollutants
where it is composed primarily of sand from a high energy environment and the
extraction site meets the evaluation factors under §230.60(b). These factors
include, but are not limited to, an examination of potential routes of
contamination, pertinent test results, and a review of spill records.
Barnstable Harbor
Given the high energy environment and consistent history of sandy material
supported by previous and recent testing results, the Barnstable Harbor Outer
Entrance Channel is considered suitable for 10-year beach nourishment (Figure
6).
Centerville Harbor
Due to the high energy environment and consistent history of sandy material
supported by previous and recent testing results, the East Bay Entrance
Channel is considered suitable for 10-year beach nourishment (Figure 8). The
Centerville River Lower Reach Channel is suitable for one-time beach placement
(Figure 8). Given the potential for fine grained material from adjacent upstream
channels to accumulate in the future the Centerville River Lower Reach Channel
is not suitable for 10-year beach nourishment. The remainder of the channels in
Centerville Harbor were composed of a mix of sand and silt and based on the
core descriptions, photos, and grain size, are not suitable for beach placement
and require additional testing to evaluate disposal alternatives (Table 16, Figures
8 and 9).
Three Bays Region
Of the channels and basins in the Three Bays Region, the Cotuit Entrance
Channel, the Cotuit –10 MLW Embayment Channel (Figure 11), and West Bay
Outer Entrance Channel (Figure 13), are suitable for 10-year beach nourishment
due to their high-energy depositional environment and recent testing results.
The Cotuit Embayment -7 ft MLW Channel and the portion of the -9 ft MLW
Cotuit Embayment Channel represented by sample TBR-CB-8 (Figure 11), the
Seapuit River Channel (Figure 12), and the North Bay Narrows Channel (Figure
14) are suitable for one-time beach placement. These channels are not suitable
for 10-year beach nourishment due to a lack of previous testing data and the
potential for finer grained material to accumulate in these depositional
environments. The remaining channels in the Three Bays region were composed
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of a mix of sand and silt and based on the core descriptions, photos, and grain
size, are not suitable for beach placement and require additional testing to
evaluate disposal alternatives (Table 16, Figures 14, 15, and 16).
Prince Cove
The Prince Cove Entrance Channel and Marina Basin were composed of a
mixture of sand and silt and based on the core descriptions, photos, and grain
size, are not suitable for beach placement (Figure 18). This area is not in a high
energy environment and therefore does meet the exclusionary criteria of
§230.60(a).
Based on the weight of evidence including the conceptual site model, low-
moderate project risk ranking, project footprints, core logs, and the grain size
results for these sediments, according to the testing and evaluation requirements
set forth in Section 404 of the CWA, the sediments to be dredged from the East
Bay Entrance Channel, Cotuit Entrance Channel, Cotuit -10 MLW Embayment
Channel, West Bay Outer Entrance Channel, and the Barnstable Harbor
Entrance Channel are considered suitable for 10-year beach nourishment. The
Centerville Harbor Lower Reach Channel, the Cotuit Embayment -7 MLW
Channel, the portion of the -9 ft MLW Cotuit Embayment Channel represented
by sample TBR-CB-8 , the Seapuit River Channel, and the North Bay Narrows
Channel are suitable for one-time beach placement. All other proposed dredge
areas are unsuitable for the beach nourishment program. Other beneficial re-
use or disposal options, including nearshore placement and open water disposal,
may be available but require additional sampling and testing to be evaluated.
This suitability determination was coordinated with EPA Region 1 and MADEP.
MADEP concurred with the determination and EPA Region 1 conducted an
individual evaluation of the project and documented their findings in a separate
memo.
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Table 16: Suitability Summary
Channel Decision Volume CY
(with OD) Placement Area
Barnstable Harbor Entrance Channel
Barnstable Harbor Entrance Channel 10-year beach
nourishment 1,305
Millway Beach,
Sandy Neck Public
Beach
Centerville Harbor
East Bay Entrance Channel 10-year beach
nourishment 149
Long Beach,
Craigville Beach,
Covell's Beach Centerville River Lower Reach Channel suitable for one time
beach placement 3,756
Centerville River Upper Reach Channel not suitable 12,112 N/A
Centerville River Spur Channel not suitable 2,518 N/A
Bumps River Channel not suitable 217 N/A
Three Bays Region
Cotuit Entrance Channel 10-year beach
nourishment 12,678
Dead Neck, Cross
St. (Riley's) Beach,
Ropes Beach
Cotuit Embayment Channel (-10 MLW) 10-year beach
nourishment 5,471
West Bay Outer Entrance Channel 10-year beach
nourishment 800
Cotuit Embayment Channel (-7 MLW) suitable for one time
beach placement 2,234
Cotuit Embayment Channel (-9 MW)
(area represented by sample TBR-CB-8)
suitable for one time
beach placement 1,696
Seaput River Channel suitable for one time
beach placement 8,042
North Bay Narrows Channel suitable for one time
beach placement 8,714
Cotuit Embayment Channel (-9 MLW) not suitable 10,367 N/A
Cotuit Embayment Channel (-11 MLW) not suitable 7,386 N/A
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Channel Decision Volume CY
(with OD) Placement Area
Three Bays Region
Hoopers landing not suitable 4,977 N/A
Conduit Town Landing not suitable 21 N/A
West Bay Spur Channel not suitable 775 N/A
West Bay Inner Entrance Channel not suitable 62,100 N/A
Bay Street Channel not suitable 30,507 N/A
Prince Cove
Prince Cove Entrance Channel not suitable 9,014 N/A Prince Cove Marina Basin not suitable 3,734
_________________________________ _________________________________
Sarah Turner
Geologist
Environmental Resources and
Marine Operations Section
USACE-New England District
Joseph B. Mackay
Chief
Environmental Resources and
Marine Operations Section
USACE-New England District
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5. References:
EPA/USACE 2004. Regional Implementation Manual for the Evaluation of
Dredged Material Proposed for Disposal in New England Waters. U.S. EPA
Region 1, Boston, MA/U.S. Army Corps of Engineers, New England
District, Concord, MA.
USACE 2018. Dredged Material Evaluation and Disposal Procedures, User
Manual. Dredged Material Management Program, U.S. Army Corps of
Engineers, Seattle District