20131279 Ver 2_Follow Up to Pre-Con Call_20170911

Strickland, Bev
From:Willson, Kenneth <[e-mail]>
Sent:Monday, September 11, 2017 3:06 PM
To:'Walter L. “Wally” Overman'; 'Ken Riley ([e-mail])'; 'Ellis, John'; Dunn, Maria
T.; Schweitzer, Sara H; Scarbraugh, Anthony; 'James Medlock
([e-mail])'; Bland, Raleigh W CIV CESAW CESAD (US);
Lekson, David M CIV USARMY CESAW (US); 'Petersen, Joen SAW'; 'Brad Rosov - 636
([e-mail])'; 'Bobby Outten - Dare County ([e-mail])'; Trowell,
Steve; 'Pelletier, Josh R CIV CESAW CESAD (US)'; Howell, Jonathan
Cc:Devisse, Julien
Subject:Hatteras Inlet Connector Channel
Attachments:Proposed Modified Connector Channel Sept 11 2017_a.pdf; HATTERAS INLET PRELIM
REPORT (CPE) 8 SEP 2017.pdf; 02.pdf
All,

As a follow up to the meeting last week, I am providing two maps that we have developed that provide additional
information on the project. Unfortunately, the staff that were working on the plans for the project are out of our Boca
Raton, FL office and were impacted by the storm on Friday and today. We hope to have them back up and running
tomorrow so that we can provide a finalized set of plan drawings. In the interim, I have provided a map (Proposed
Modified Connector Channel Sept 11 2017_a.pdf) showing the southern area that was cleared by the cultural resource
survey and the proposed channel to be dredged. The color background imagery is the same color bathymetry shown in
the previously provided maps reflecting conditions on August 21 and 22, 2017. The attached report was submitted this
morning to the Department of Natural and Cultural Resources confirming that the Cultural Resource Investigation Area
has been assessed and that in the opinion of the archeologist no “no-work zones” are required. Also attached is a map
(02.pdf) that shows the location of the proposed south connector channel in relation to the Tideland electric cable and
the previously mapped SAV.

The USACE navigation branch has informed us that they plan to begin work as early as Wednesday Sept 13. At this time,
given the information provided previously and the information provided in this email, the County intends to issue a
notice to proceed to the USACE navigation branch to begin maintenance dredging in the south connector channel. We
will provide a final set of updated plans as soon as our folks in Boca Raton are back online. I will keep you all updated as
to the start, status, and completion of dredging.

Kind Regards,

Ken Willson
Client Program Manager
Tel: + 1 910 791 9494
Cell: + 1 910 443 4471
[e-mail]
PLEASE NOTE NEW EMAIL ADDRESS

APTIM
4038 Masonboro Loop Road
Wilmington, NC 28409
1

2

Preliminary Report Entitled:
A Phase I Remote -Sensing Archaeological Survey of
Proposed Channel Improvement Area Inside Hatteras
Dare County, North Carolina
Submitted to:
Coastal Planning & Engineering of North Carolina
4038 Masonboro Loop Road
Wilmington, North Carolina 28409
Submitted by:
Gordon P. Watts, Jr., Ph.D, RPA
Tidewater Atlantic Research, Inc.
P.O. Box 2494
Washington, North Carolina 27889
8 September 2017

Table of Contents
Page
I
Listof Figures.......................................................................................................................................ii
Introduction..........................................................................................................................................1
SurveyLocation....................................................................................................................................1
SurveyMethodology........................................................................................................................... 2
MagneticRemote Sensing...................................................................................................................3
AcousticRemote Sensing............................................................................................................... 3
DataAnalysis................................................................................................................................... 3
SurveyResults...................................................................................................................................... 3
Results.................................................................................................................................................... 6
Conclusions........................................................................................................................................... 6
AppendixA...........................................................................................................................................8

List of Figures
Page
ii
Figure 1. Hatteras Inlet South Channel survey area location........................................................1
Figure 2. Survey area and border points..........................................................................................2
Figure 3. Survey track lines in the South Channel area.................................................................. 4
Figure 4. Magnetic anomalies identified in South Channel survey area ..................................... 5
Figure 5. Sonar mosaic illustrating extent of coverage in South Channel survey area.............5
Figure 6. Sonar image of bottom surface in vicinity of buoy anchor and cable anomalies....... 6
Figure 7. Google Earth 2017 image of Hatteras Inlet illustrating deep -water channel..............7

Introduction
Coastal Planning & Engineering of North Carolina (CPE -NC) is the project engineer
representing Dare County (DC) to identify and permit a site in Pamlico Sound inside
Hatteras Inlet where improvements to navigation channels can be made now and in the
future. In order to determine the proposed project's potential effects on significant
submerged cultural resources, CPE -NC requested that Tidewater Atlantic Research, Inc.
(TAR) of Washington, North Carolina conduct a Phase I archaeological investigation in the
project area as required by the North Carolina Department of Natural and Cultural
Resources. In response to immediate priorities for dredging, TAR carried out a survey of
the south channel alignment on 4 September 2017.
Survey Location
The south channel alignment survey location lies in Hatteras Inlet off the eastern end of
Ocracoke Island (Figure 1).
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319
26 36
26 f 33 t 38
Figure 1. Hatteras Inlet South Channel survey area location.
The south channel survey area is a rectangle measuring approximately 3,600 feet in length
and 1,300 feet in width (Figure 2).

2
Figure 2. Survey area and border points.
North Carolina, NAD 83, U.S. Survey foot, State Plane coordinates for the south channel
survey area are shown in Table. 1.
Border Point
X Coordinate
Y Coordinate
A
256,529-0.1
540925.7
B
2069902.2
540117.1
C
2969364.9
5388.52.9
2965[}25.1
539634.2
Table 1. South Channel survey coordinates.
Survey Methodology
The remote -sensing investigation conducted by TAR was carried out using a 25 -foot survey
vessel. A combination of cesium vapor magnetometer and high-resolution sidescan sonar
was employed to generate magnetic and acoustic data. Remote -sensing data collection was
controlled by a HYPACK computer navigation system using differential global positioning
system (DGPS). The investigation generated magnetic and acoustic data on 50 -foot survey
line spacing.

41
Magnetic Remote Sensing
An EG&G GEOMETRICs 881 cesium vapor magnetometer capable of plus or minus 0.1
gamma resolution was employed to collect magnetic data in the survey area. Magnetic data
was collected on a one -second interval, and the sensor deployed at the water column surface
due to shallow water. Magnetic data was collected along transects spaced on 50 -foot
intervals. Magnetic data was recorded as a data file associated with the HYPACK computer
navigation system.
Acoustic Remote Sensing
A Klein 3900 digital 600 / 1200kHz high-resolution digital sidescan sonar was employed to
collect acoustic data in the survey area. During the survey, the sidescan sonar transducer
was deployed at a depth just sufficient to clear the survey vessel hull. Acoustic data was
also coll1ected along transects spaced on 50 -foot intervals in all survey areas. A 50 -meter
sonar range scale was selected to provide a minimum of 200% coverage of the survey area
and high target signature definition. Acoustic data was recorded as a Klein XTF data file
and tied to the magnetic data by regular DGPS annotations.
The remote -sensing survey was run on a digitized navigation chart of the project area and a
U.S. Army Corps of Engineers hydrographical data file. A DGPS was used to control
navigation and data collection in the survey area. A TRIMBLE dedicated DGPS was used in
conjunction with HYPACK navigation and data collection software. All magnetic and
acoustic records were tied to positioning events generated by HYPACK and stored in the
navigation computer in conjunction with DGPS generated positioning coordinates.
Data Analysis
Anomalies and acoustic target signatures suggestive of significant submerged cultural
material were isolated and analyzed in accordance with signature characteristics previously
demonstrated to be reliable indicators of historically significant submerged cultural
resources. Assessment of each magnetic anomaly and/or sonar target was designed to
determine if material generating the signature was potentially significant or modern debris.
The anomaly map and associated table includes target location coordinates in North
Carolina, NAD 83, US Survey foot, State Plane coordinates.
Survey Results
A total of 26 survey lines were run to collect data in the south channel investigation area
(Figure 3).

4
Figure 3. Survey track lines in the South Channel area.
Line -by-line analysis of the magnetometer data identified a total of 85 anomalies (Figure 4).
Thirty-eight are associated with lost navigation buoys and / or their associated mooring
anchors or cables. Another five of those anomalies were associated with current navigation
reference buoys. One was associated with a buoyed trap. Thirty-five additional anomalies
represent small single objects that likely include large brake drums used to anchor small
temporary navigation reference buoys, small boat anchors, chain, traps, pipe or other
similar modern debris. Six anomalies represent more moderate single objects such as engine
blocks used to anchor small temporary navigation reference buoys, larger boat anchors or
other similar modern debris (Appendix A).

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rW3_tf W 'r
•- f.. -,Near
♦� rlr'a• ♦�
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112
5
Figure 4. Magnetic anomalies identified in South Channel survey area.
Line -by-line analysis of the sonar data confirmed that most of the survey area was covered
(Figure 5). It also indicates that no material associated with the 85 anomalies was detectable
on the sandy bottom surface (Figure 6).
j,%k,r%wr F1 H 4S
R 4s
r
'1 P
/ Y
1 F
n
Figure 5. Sonar mosaic illustrating extent of coverage in South Channel survey area.

6
Figure 6. Sonar image of bottom surface in vicinity of buoy anchor and cable anomalies.
Results
Analysis of the magnetometer data generated by the south channel area survey indicates
that the 85 anomalies represent a scatter of material associated with cables, debris associated
with navigation references that are both government and private and material such as traps,
small vessel anchors and other marine debris. Due to dramatic changes in the configuration
of Hatteras Inlet it is also likely that some of the material generating anomalies in the survey
area could be associated with terrestrial structures and debris. In addition, most of the
anomalies located in the eastern end of the survey area lie in water deeper than proposed
dredging. Although, the anomalies in shallow water represent every type of signature
characteristic, all are indicative of small ferrous objects. None of those anomalies appear to
have signature characteristics representative of vessel remains. Sonar data confirms that
material generating the south channel anomalies is presently buried.
Conclusions
Based on the data it does not appear that proposed dredging to improve the south channel
will impact any National Register of Historic Places eligible submerged cultural resources.
As channels have migrated continuously in the survey area vessel remains would likely
have settled below the depths of proposed dredging as is the case with anomalies in the
deep -water channel in the eastern end of the survey area (Figure 7). No additional
investigation in the south channel survey area is recommended.

Figure 7. Google Earth 2017 image of Hatteras Inlet illustrating the deep -water channel at the eastern end of the survey area.

Appendix A

Anomaly
004-1-nm-7g-94.lf
X Coordinate
2968168.2
Y Coordinate
539080.1
Assessment
Small Single Object
008 -4 -mc -53g -157.8f
2965567.2
539842.3
Buoy
009-2-nm-4.lg-52.5f
2965693.4
539848.1
Buoy
015-3-dp-7.7g-40.8f
2966475.9
540031.7
Buoy
018-3-dp-36.8g-54.4f
2966917.4
540052.3
Buoy
019-3-dp-69.8g-47.7f
2967206.5
540048
Buoy
003 -2 -pm -2.3g -20.6f
2965602.5
539609.7
Buoy Anchors and/or Cables
004 -3 -pm -2g -53.3f
2965642.7
539629.2
Buoy Anchors and/or Cables
008 -3 -pm -16.l g -40.6f
2966873
539531.3
Buoy Anchors and/or Cables
013-4-dp-14.1 g -51.6f
2967172.9
539748.1
Buoy Anchors and/or Cables
009-3-dp-30.7g-101.7f
2965392.4
539921.8
Moderate Single Object
013 -5 -mc -20.7g -116.4f
2965176.8
540212.4
Moderate Single Object
016 -1 -nm -24.4g -92f
2968645.2
539559.5
Moderate Single Object
018 -4 -pm -19.6g -107.9f
2965368.1
540401.2
Moderate Single Object
021-3-dp-26.5g-150.4f
2965268.8
540590.5
Moderate Single Object
022-5-dp-15.8g-229f
2965316.8
540598.1
Moderate Single Object
001 -1 -mc -42.1g -413.8f
2967065.2
539158
Buoy Anchors and/or Cables
003 -1 -nm -66.4g -375.9f
2967211.3
539253.9
Buoy Anchors and/or Cables
004 -2 -nm -60.3g -388.2f
2967411.2
539202.7
Buoy Anchors and/or Cables
006 -1 -mc -17.28-557.3f
2967681.6
539262.6
Buoy Anchors and/or Cables
007-1-mc45.7g-551.6f
2967553.4
539386.4
Buoy Anchors and/or Cables
008 -1 -mc -39.1g -527.3f
2967777.3
539369.8
Buoy Anchors and/or Cables
009-1-dp-37.3g-393f
2967592.8
539454.8
Buoy Anchors and/or Cables
010 -1 -mc -26.9g -559.8f
2967880.2
539453.7
Buoy Anchors and/or Cables
011 -2 -mc -26.4g -495.1f
2967839.2
539515.5
Buoy Anchors and/or Cables
012 -2 -mc -49.1 g -500f
2968079
539457.3
Buoy Anchors and/or Cables
013 -2 -mc -60g -282.8f
2967955.5
539585.1
Buoy Anchors and/or Cables
013 -3 -pm -12.8g -102.9f
2967704.2
539628.9
Buoy Anchors and/or Cables
014 -1 -mc -32g -255.4f
2968287.2
539540.9
Buoy Anchors and/or Cables
015-1-dp-43.8g-334f
2968085
539636
Buoy Anchors and/or Cables
016 -2 -nm -9.9g -186.2f
2968414.1
539630.5
Buoy Anchors and/or Cables
016 -3 -nm -43.8g -148.3f
2968169.7
539668.8
Buoy Anchors and/or Cables
016-4-dp-10.8g-46.1 f
2966692.1
540002.8
Buoy Anchors and/or Cables
016 -5 -nm -2.9g -50.9f
2966406
540075.4
Buoy Anchors and/or Cables
017 -1 -mc -42.9g -294.5f
2968264.9
539697.7
Buoy Anchors and/or Cables
018 -1 -mc -32g -267.8f
2968468.5
539704.5
Buoy Anchors and/or Cables
018-2-dp-16.5g-127.7f
2968116.5
539783.2
Buoy Anchors and/or Cables
019 -1 -mc -41.1g -271.6f
2968273.2
539806.4
Buoy Anchors and/or Cables
019 -2 -nm -17.4g -193.8f
2967969.6
539871.6
Buoy Anchors and/or Cables
020 -1 -mc -19.9g -693.9f
2968372.6
539811.3
Buoy Anchors and/or Cables
020-2-dp-1.1 g -52.5f
2967573.1
540014.3
Buoy Anchors and/or Cables
021-1- mc -32g -210.4f
2968453.6
539883.2
Buoy Anchors and/or Cables
021 -2 -nm -17.5g -113f
2967887.6
540014.1
Buoy Anchors and/or Cables

022-1-mc-5.9g-252.4f
2968610.9
539875.9
Buoy Anchors and/or Cables
022-2-pm-1.6g-74.9f
2968065.2
540009.1
Buoy Anchors and/or Cables
023-1 -dp-1 0. 1 g-1 43.9f
2968501
539960.8
Buoy Anchors and/or Cables
024-1-pm-5.3g-70.4f
2968128.3
540098.2
Buoy Anchors and/or Cables
025-1-nm-14.9g-115.5f
2968576.6
540041.7
Buoy Anchors and/or Cables
025-2-dp-3.1 g-55.5f
2967954.9
540164.3
Buoy Anchors and/or Cables
005-1-mc-14.4g-675.4f
2967538.1
539285.6
Buoy Anchors and/or Cables
001-2-pm-3g-30.3f
2965313.7
539564.2
Small Single Object
001-3-pm-20.4g-78.2f
2965083.5
539628.2
Small Single Object
003-3-pm-5.1g-27f
2965355.3
539663.6
Small Single Object
006-2-dp-11.1g-54.1f
2966293.3
539579.3
Small Single Object
006-3-pm-3.7g-58.8f
2966016.4
539640
Small Single Object
006-4-nm-2.6g-61.1f
2965110.4
539833.3
Small Single Object
007-2-pm-2.1g-50f
2966726.1
539549.4
Small Single Object
008-2-nm-3.3g-42.3f
2967010.1
539530.6
Small Single Object
009-4-pm-13.5g-68.1f
2965243.3
539966.7
Small Single Object
010-2-dp-1.7g-35.6f
2967366.2
539554.8
Small Single Object
010-3-dp-4.9g-75.5f
2966686.7
539694.8
Small Single Object
011-1-pm-6.7g-77.9f
2968258.2
539406.8
Small Single Object
012-1-pm-5.2g-54.7f
2968434.2
539419.1
Small Single Object
013-1-pm-7.5g-62.7f
2968223.9
539533.9
Small Single Object
015-2-nm-4.2g-65.4f
2967807.3
539703.3
Small Single Object
015-4-nm-5.9g-36.7f
2965730.5
540182
Small Single Object
016-6-pm-3.3g-50.7f
2965932
540179.3
Small Single Object
01 6-7-dp-1 0.2g-1 06.4f
2965283.8
540317.9
Small Single Object
017-2-dp-5.3g-43.2f
2965346.6
540375.6
Small Single Object
020-3-pm-7.7g-85.2f
2966173.4
540331.8
Small Single Object
020-4-pm-3.6g-50.8f
2965576.6
540459.9
Small Single Object
020-5-nm-3.6g-58.7f
2965393.8
540482.2
Small Single Object
022-3-mc-5.7g-84.5f
2966829.2
540273
Small Single Object
022-4-dp-3.4g-80.1f
2965589.9
540548.6
Small Single Object
023-2-pm-5.8g-53.5f
2966942.7
540316.5
Small Single Object
024-2-pm-1.5g-68.6f
2966705.7
540402.4
Small Single Object
024-3-pm-10.1g-66.3f
2965499.3
540685
Small Single Object
025-3-pm-3.5g-55.3f
2966750.7
540466.4
Small Single Object
0254-dp-3.3g-49.1f
2966500.8
540520.6
Small Single Object
026-1-pm-8.9g-54f
2965839
540711.8
Small Single Object
026-2-nm-8.3g-51.6f
2965047.9
540867.5
Small Single Object
027-1-nm-6.8g-40.5f
2965904.7
540760.6
Small Single Object
027-2-pm4.9g-51.6f
2965437.6
540840.3
Small Single Object
005-2-mc-1.4g-71.6f
2964950.8
539850.6
Small Single Object
007-3-dp-12.4g-73.4f
2965007.8
539923.2
Trap

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PROPOSED CONNECTOR CHANNEL IS NOT FIXED
AND RATHER FOLLOWS DEEP WATER AT TIME OF
MAINTENANCE. AND/OR A PREVIOUSLY
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SHOWN IS REPRESENTATIVE ONLY AND WILL
CHANGE BASED ON BAIHYMETRY AT TIME OF
MAINTENANCE,
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Notes: Legend: TITLE:
El 1. Coordinates are in feet based on the Q Survey Areas Hatteras Inlet Connector Channel
North Carolina State Plane Coordinate Area of Interest
System, North American Datum of
1983 (NAD 83).
2. Background imagery is ESRI Imagery APTIM
Basemap.
A P IT
I 4038 Masonboro Loop Road
y Feet ! l Wilmington, NC 28409
0 350 700 Ph. (9100791-9494
c
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Notes: Legend: TITLE:
El 1. Coordinates are in feet based on the Q Survey Areas Hatteras Inlet Connector Channel
North Carolina State Plane Coordinate Area of Interest
System, North American Datum of
1983 (NAD 83).
2. Background imagery is ESRI Imagery APTIM
Basemap.
A P IT
I 4038 Masonboro Loop Road
y Feet ! l Wilmington, NC 28409
0 350 700 Ph. (9100791-9494
c
1 inch = 700 feet Date: 08/30/17 By: HMV Comm No.: 63622442402 Figure No.: 1

—541000
540000
�, ++1I1I ly1
I'
—539000
0 0 0
0 0 0
0 0 0
v LO o
—538000 C°`° `°
a) a)rn
N N N
Notes:
1. Coordinates are in feet based on the North Carolina
State Plane Coordinate System, North American
Datum of 1983 (NAD 83).
N
N
O O
O
O O
O
v O
O
O O
O O
O
O
O O
O
541000
540000--1
539000
0 250 500
Feet
0
0 0
0 0
0 rn
(°`°
a) a)538000
N N
Legend:
0 Proposed Channel - Sept. 2017
Cultural Resource Investigation Area