Loading...
HomeMy WebLinkAboutDCM Written Notice , South Ferrry Channel 2021COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC 4038 MASONBORo Loop ROAD WILMINGTON, NC 28409 910-399-1905 September 23, 2021 Heather Coats Beach & Inlet Management Project Coordinator North Carolina Division of Coastal Management 127 Cardinal Drive Wilmington, NC28405 Subject: Hatteras Inlet Channel Maintenance Project —Written Notice of Project Initiation Dear Ms. Coats: The Division of Coastal Management (DCM) issued a CAMA Major Permit for the proposed Hatteras Inlet Channel Maintenance Project on December 22, 2016 (#129-16). This permit was subsequently renewed on January 22, 2020 and has a current expiration date of December 31, 2024. This letterserves as written notice of project initiation as required in Condition 7 of the permit. Please find attached to this letter revised permit drawings dated September 23, 2021, which provide the location of the proposed channel for the upcoming event. The project includes maintenance dredging within a portion of the Hatteras Inlet Connector Channel, which runs between the inlet gorge and the ferry channel in proximity to Ocracoke Island. This channel is locally referred to as the "South Ferry Channel". The attached plan view drawing shows the location of the proposed channel, the disposal area, and previously mapped submerged aquatic vegetation (SAV) resources in the vicinity. The channel is proposed to be dredged by a combination of the US Army Corps of Engineers (USACE) side cast Dredge Merritt and special purpose Dredge Murden. Material dredged from the channel will be sidecasted to either side of the proposed channel and or placed in the nearshore disposal location offshore of Ocracoke Island. The environmental window for dredging opens October 1. The USACE and Dare County have agreed on a tentative schedule to begin dredging around October 4, 2021. The actual dredging of the channel is anticipated to last approximately three (3) weeks. We do not anticipate any issues with dredging outside of the environmental windows established by the permit for the upcoming proposed maintenance event. At the time of this letter, it is anticipated that the project will be conducted between October 4, 2021 and October 25, 2021. As you are aware, the Major CAMA Permit (#129-16), originally issued in December 2016, was modified in March 2018 to allow for maintenance of a 200 ft. wide channel to a depth of -12 ft. MLW. Based on budget, dredge availability, and conditional surveys conducted September 21, 2021, the proposed channel dimensions for this upcoming dredging event are to establish a 150-foot wide channel at elevation -8 ft MLW along the NE -SW oriented segment of the channel, and 150-foot wide channel at elevation -8 ft. COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC. c GA51AE --== -- Page 12 PROTECTION ENGINEERING MLW along the E-W oriented segment of the channel. Based on the conditional survey from September 21, 2021, establishment the proposed channel will require the dredging of approximately 31,600 cy of material. Please note that these channel dimensions and configurations are what is anticipated, but we reserve our authorization to increase the width of the channel up to 200 feet and the depth up to -12 ft. MLW. The proposed channel is shown on the attached drawings, including both plan view and cross - sectional view. As required by the permit, we have contacted Don Field with NOAA to determine if any updated imagery is available for the project area to delineate SAV habitat. As of the date of this letter, we have not received a response from Mr. Field; however, once we receive a response, we will provide that to your agency via email. Our last information from February 2021 was that the Albemarle Pamlico National Estuary Partnership (APNEP) collected new imagery in May/June 2020 and NOAA was awaiting deliverables to be provided by the contractor. We made the formal request that the imagery and delineation be provided to us when available. Regarding contact information during dredge activities, Brennan Dooley of the USACE will be the point of contact for the USACE dredging operations. Brennan's Phone Number is (910) 251-4916 and his email is brennan.j.dooley@usace.army.mil. I will be the County's agent and can be contacted via cell phone at (910) 443-4471. Please feel free to contact me anytime for further clarification or explanation of the project. Sincerely, Ken Willson Senior Program Manager Coastal Protection Engineering of North Carolina, Inc. Office: 910-399-1905 Mobile: 910-443-4471 kwillson@coastalprotectioneng.com CC: Barton Grover, Dare County Jonathan Howell, NC DCM Gregg Bodnar, NC DCM Robert Pullinger, NC DWR HATTERAS INLET MAINTENANCE PROJECT DARE COUNTY. NORTH CAROLINA PAMLICO SOUND TTER.4 HA INLET OCRACOKE ISLAND PROJECT AREA ATLANTIC OCEAN N.T.S. NOT FOR CONSTRUCTION FOR REGULATORY REVIEW ONLY 0 7500 15000 GRAPHIC SCALE IN FT -jm%—f\JIJIV V 1LLL �.' CAPE HATTERAS PROJECT LOCATION MOREHEAD CITY CAPE LOOKOUT CAPE FEAR ATLANTIC OCEAN SHEET INDEX 1 COVER SHEET 2 PROJECT OVERVIEW 3 CONNECTOR CHANNEL PLAN VIEW 4 CONNECTOR CHANNEL CROSS SECTIONS GENERAL NOTES: 1. COORDINATES ARE IN FEET BASED ON NORTH CAROLINA STATE PLANE COORDINATE SYSTEM, NORTH AMERICAN DATUM 1983, (NAD83) 2. ELEVATIONS ARE REFERENCED TO MLLW. PERMITTED DREDGE DEPTH IS RELATIVE TO THE MLW DATUM BEING APPROXIMATELY 0.08' ABOVE MLLW PER NOAA PID EX0400. 3. DATE OF AERIAL PHOTOGRAPHY: FEBRURARY 16, 2021, COURTESY OF USACE. 4. SURVEY DATA COLLECTED BY US ARMY CORPS OF ENGINEERS. SEPTEMBER 21, 2021. 5. BATHYMETRIC CONTOURS REPRESENT THE CONDITIONS OF THE CHANNEL ON SEPTEMBER 21, 2021 AND SHOULD NOT BE RELIED ON FOR NAVIGATION PURPOSES. I 1-f— C 1t 1 r-% Q HAT-03-V-18 +0.52' MHW +0.41' NAVD88 +0.08' MLW __________________ ____ +0.00' MLLW TIDAL DATUM , REFERENCE, MEAN LOW WATER LINE MEAN HIGH WATER LINE CROSS SECTION LINE HATTERAS INLET BORINGS 2003 AND ID NEARSHORE DISPOSAL AREA SUBMERGED AQUATIC VEGETATION AND 100 FT. BUFFER ASBUILT EXISTING CABLE ROUTE (CALDWELL CABLE VENTURES) EXISTING CABLE ROUTE (UTLITY ELECTRICAL CONSULTANTS, PC) ASBUILT NEW CABLE ROUTE TIDAL DATUM REFERENCE BASED ON NOAA TIDE STATION ID 8654467 EPOCH 1983-2001" 0 z re W W z ,w M y N z U W ii W z O U F Its LL_ H W w N R a U = prn w 0 w ,O O N W :a z J Q s z z .� a � W a Cl<z z O � z t�o��W -1 COASTAL PROTECTION ENGINEERING T T � 3 w a Y E Y E N 0 w H o w O M Z 0 w -0 va � �� �< 0 0 0 - U w O a � z a � w o a U W Wz= w ,,W� ozo V) N Q z � 2:W Lu of Lu 0' Uz0 U o W Wa Q� DRAWING NO. CS-1 NAME SHEET 1 OF 4 m m m ( Im m o l� l� l� lL7 1p M Ul m m V 00 CD O U1 U1 O CD O O OAO 1�es, O a N 547000 IN 542000 SIN 537000 m _ N G L '�p� M' rl Ln 0 n O NOT FOR CONSTRUCTION FOR REGULATORY REVIEW ONLY 0 z oc W W CONNECTOR z M CHANNEL CORRIDOR z N 547000 LY Lu W z O � HAT-03-V-6 W W 0 R o U po w LU �. ,p O N U R � z J O ti.. i • I, STAL PROTEETION 71 IF 14 ----------- BREAKING SHOAL �' AVOIDANCE AREA u- .�i■■■■■■■■■■� Lcul Lu ■■���— NEARSHOREDISPOSAL • LOCATION - 000 DRAWING NO. •00 0 ��- BOTTOM OF CUT/CHANNEL COORDINATE TABLE POINT ID EASTING NORTHING ELEVATION a 2962079.7 540535.6 -8.0 b 2962139.2 540397.9 -8.0 c 2963809.4 541119.2 -8.0 d 2965371.7 540942.2 -8.0 e 2965388.5 541091.3 -8.0 f 2963786.5 541272.7 -8.0 r a 0 no LIFE SAVING STATION AVOIDANCE AREA OCRACOKE ISLAND"' <. . NOT FOR CONSTRUCTION FOR REGULATORY REVIEW ONLY PROPOSED CONNECTOR CHANNEL r gi CHARTED WRECK AVOIDANCE AREA CONNECTOR CHANNEL CORRIDOR 0 200 400 GRAPHIC SCALE IN FT ZEAKING SHOAL ✓OIDANCE AREA NOTE: 1. ELEVATIONS ARE REFERENCED TO MLLW. PERMITTED DREDGE DEPTH IS RELATIVE TO THE MLW DATUM BEING APPROXIMATELY 0.08' ABOVE MLLW PER NOAA PID EX0400. 0 z oc W W z ,w M y N z L) W ii w O L) W w N ea a L) = O0 w 0 �. rO O N W :a Er z J a S m 0 z F O� IX (7 � w a Z �z z O W 0 z V O 0� w '1 COASTAL PROTECTION ENGINEERING Q E T T � 3 w LY N w o wO wa '��°� .v, oa 0 0 0 - U w O Z z > a 0 Z Zw U 09f >Qu a w Z = J Swz a F- w N Z rIjO Q O ZQ a U Lu 0 Lu 0—U 0 w w Z O = U DRAWING NO. PV-2 SHEET 3 OF 4 In MIN* CROSS SECTION A -A' C-C' ►m MHW EL. +0.52' 1 1 t I MLW EL.+0.08' ----. SEPTEMBER 21, 2021 EXISTING GRADE TARGET AD EL. =-8.0' MLLW _---__---- ----- -------------------- MAXIMUM AD EL.=-11.92'MLLW I I 0+00 7+.0 5+10 7+.0 10+00 17+50 15+00 17+50 70+00 77+50 75+00 77+50 30+00 37+50 35+00 DISTANCE ALONG SECTION (FEET) SECTION B-B' L w w >w i J J -11 Z O � -1! Lu a J -21 w -2 5 2021 0 161 -10 =-8.0' MLLW 15 1.92' MLLW 20 -25 50 10 10 20 20 DISTANCE ALONG SECTION (FEET) NOT FOR CONSTRUCON FOR REGULATORY REVIEW ONLY TI R s MHW E SEPTEMBER 21, . +0.52' EXISTING GRADE MLWE .+0.08' i 1L 3 J1 � TARGET AD EL. i MAXIMUM AD EL. =4 150'+CHNNEL WIDTH t SECTION C-Cl -2 A 0 W -10 AD EL. =-8.0MLLW -15 -11.92' MLLW -20 -25 50 10 10 20 20 DISTANCE ALONG SECTION (FEET) NOTE: 1. ELEVATIONS ARE REFERENCED TO MLLW. PERMITTED DREDGE DEPTH IS RELATIVE TO THE MLW DATUM BEING APPROXIMATELY 0.08' ABOVE MLLW PER NOAA PID EX0400. 2. MAXIMUM AD EL. OF-11.92' MLLW SHOWN ON CROSS SECTIONS IS EQUAL TO-12.00' MLW PER NOAA PID EX0400. 5 W W z 0 z o W -5 0 u o W 10 W Lu p w U e •- oo � oW. a Z eR o� o -15 wU Z J m U Q L ZZp � C �� w N Q o Gz zm� w -20 0 � u w R MHW El.+0.52' I MLW E L.+0.08' SEPTEMBER EXISTING 3 21, 2021 GRADE 1 I TARGE- T MAXIMUM AD EL. _ 150' C ANNEL IDTH CONRUR� PROTECTION ENRINEERINO valq°I��loa U oz c � J ZU�z UI w¢ Qp N U .0, U oz z£ F� O0 p �z ♦=i?ozU. UU � U w6 �o D0. MNG NO. XS-1 sHEEr a OF a