Embed Size (px)
Citation preview
EID&B ENGINEERSANDAncutrtcts, PC.
#teceiveC
SEP i :r ZAV
, i\lysrlr.rs,Flanning & Development
330 Crossways Park Drive, Woodbury. New york 11797
516-364 9890 .118-460 3634 . Fax.516-364-9045. www.db,eng.comBoard of Directors
Henry l. Chlupsa, P.E.. BCEEPresident G Chairmon
Steven A. Fangmann, P.E., BCEE
Executive Vice President
Robert L Raab, PE., BCEE, CCMSenior Vice President
Vice Prcsidents
Rob J. DeGiorgio, PE., CPESCSenior Vice President
Stephen M Dudar, P.E.
Senior Vice President
Dennrs F Koehler. P.E
Senior Vice President
Joseph H. MarturanoSeniar Vice President
William D. Merkl n, P.E.
Senior Vice President
John Schreck, PESeniar Vice President
Brian M. Ve th, PE.
Senior Vice President
Richard M. WalkaSenlar Vice President
Garrett M. Byrnes. P.E.
Vice President
Thomas P. Fox, PG.Vice Prestdent
Michael Neuberger. P.E.
Vice President
Theodore S. Pytla( JrVice Pregdent
Philip R. Sachs. P.E.
Vice President
Charles J. Wachsmuth, P.E.
Vice President
Din of Architecture
Michael P Sciarrillo, AlA, NCARB
Senior Associates
Ellen R DeOrsay
Matthew R. DeV nney. PE.
Frank DeVita
Joseph A F oral so. P.E.
Michael R. Hofgren
Christopher KoeSel, P.E.. CCM
lamil M randa, PE
Olga Mubarak
Adam Rem ck. P.E
Daniel Shabat, P.E
Asrociates
Meredith A. Byers
Anthony M. Caniano
Rudotph F. Cannavale
James.J. MaSda
Michele Mastrangelo
Robbin A. Petrella
Swaroop C. PuchalapalLi. P.E.
Edward l. Reilly
Michael G Savarese, P.E.
Stephen E. Tauss, P.G.
September 6,2017
NYS DOS Coastal Management Program41 State StreetAlbany, NY 12231-0001
Attn: ConsistencyReview
Re: Indian Island Suffolk County Park - Living ShorelineIndian Point Road, Riverhead, NY I1901scrM# 0600-112-20-2.1D&B No. 3328
Dear Sir/Madame:
Please find enclosed the following materials necessary to submit a permitapplication for the above referenced project.
l. Completed DEC Joint Application Form2. ENG Form 43453. NANY Form 2014. Federal Consistency Assessment Form5. FCA Supplement Form6. Site Plan/Cross Section7. Survey8. Photographs & Location Map9. Pro.iect Narrative10. Modeling AnalysisI l. Preliminary Erosion Mitigation Report12. AgentlPermittee Authorization Form13. Additional Living Shoreline References
D&B Engineers and Architects, P.C. (D&B) in conjunction with First CoastalCorporation, was retained by the Suffolk County Parks Department to provideengineering services for the above referenced project.
The Indian Island Suffolk County Park living shoreline project is proposed as anenvironmentally sustainable method of providing protection, resiliency andstabilization to the coastal ecosystem (upland and wetland habitat) through thecreation of natural and nature-based features (lrlNBF) within the lndian Island area.The Indian Island area has been experiencing chronic loss to the bluff, shoreline,and marshes. These losses are critically threatening important infrastructure (CircleDrive), navigation, and destroying productive marsh habitat.
" SO+ Yeqrs of Facing Challenges, Finding Solutions... Since 19 6 S"
D&B ENcINTTRS AND ARcHlrrcrs. P.C.
NYS DOS CoastalManagement ProgramSeptember 6,2017
Page Two
The bluff in several key locations on Indian Island is experiencing ongoing, catastrophic andirreversible bluff loss that is resulting in a landward migration of the bluff threating the collapse ofCircle Drive. Suffolk County has been forced to frequently place sand to keep the road frombecoming undermined. Additionally, the marsh areas within Indian Island have been experiencingsignificant loss, reducing their size resulting in a loss of vital and productive tidal wetland habitat.
The project is proposed to provide increased protection to the area against flooding/erosion,stabilization of the shoreline and navigation channel, and restoration/enhancement of the regionalecosystem, marsh and waterbody. The proposed living shoreline project contains three livingsegmented emergent rock sills, marsh habitat restoration/ enhancement consisting of compatiblebeach nourishment fill planted with wetland vegetation, and bluff stabilization consisting of anupland cantilevered PVC bulkhead covered with compatible fill and planted with beach grass.
If you have any questions or need additional information, please call me at (516) 364-9890.
Very truly yours,
-/eLZThomas Schaefer, P.E.Associate
TSt/cfEnclosuresCc: SC Parks
First Coastal Corporationo 3328\T50906 I TNYSDOSCMP Ltr
COMPLETED DEC JOINT APPLICATION FORM
fne,t14 VonK/ . STATEY-DepartmentolEnvlronmentalCons,€rvatlon
OfflcaofGeneral Scrvlces
Received
oeoarrment sEP 11 2ol7of State ir1ysDosplanning a oeijopment
U8 Anru Corpaol EnClrao.
Jorxr ApplrclrroN FoRMFor Permits for activities activities affecting streams, waterways, waterbodies, wetlands, coastal areas, sources of water,and endangered and threatened species.
You must separately apply for and obtain Permits from each lnvolved agency before starting work. Please readall inetructions.
1. Applicatlons To:>NYS Department of Environmental Conservatlon [-f- I Cnecf here to confirm you sent this form to NYSDEC.
Check all permits that apply: [l Oams and lmpound - aA Tidal Wetlands ! Water Withdrawal
[ ] Stream Disturbance ment Structures
[] Excavation and Fill in aAy Water Quality- - Navigable Waters Certification
l= l Oocls, Moorings or | -
i Fresnwater WetlandsPlatforms
Recreational Rivers i lncidental rake ofCoastal Erosion Endangered /
' Management Threatened Species
>US Army Corps of Engineers [7] Cnecf here to confirm you sent this form to USACE.
Check all permits that apply: 7,-l Section 404 Clean Water Act [l- l Section 10 Rivers and Harbors Act
ls the project Federally funded? l.
*, yes |l ruo
lf yes, name of Federal Agency:
General Permit Type(s), if known:
Preconstruction Notification : !*l Yes 7. No
>NYS Office of General Serulcee
Check all permits that apply:
l7'l State owned Lands Under Water
[1-l Ctreck here to confirm you sent this form to NYSOGS.
L,] Utitity Easement (pipelines, conduits, cables, etc.) [-] Docks, Moorings or Platforms
>NYS Department of State f Cnecf here to confirm you sent this form to NYSDOS.
Check if this applies, Yl Coastal Consistency Concurrence
Mailins Address Post Office / City State Zip
Tetephone W Emait nicholas.
Applicant Must be (check all that apply): M Orrner. 7; Operatot Lessee
State ZioTNTelephone m Email
JorlrApplrcnron Fonu 08116 Page I of4
Jolnr Appt-tcAroN FoRtrt - Continued. Submit this completed page as part of your Application.
Mailing Address Post Office / City State Zip
Tetephone @ Email
4. Name of Contact /
lndian lsland Countv ParkPropertv Tax Map Section / Block / Lot Number:
State ZioNY r;--l
Cross River Dr East side -1,300 ft south of Hubbard Ave. Location Map Attached
Project Location Coordinates: Enter Latitude and Longitude in degrees, minutes, seconds:iatitroe'l+o --l" |.55 I' 13828 I' Lonsitro",'lz l" 136 -_l' il"
6. Project Descrlption: Provide the following information about your project. Continue each response and provideany additional information on other pages. Attach olans on separate oaoes.
cubic vards of fill
ls tree cutting or clearing proposed? [-] ves lf Yes, explain below. ["] noTimingoftheproposedcuttingorclearing(month/yearl.
Number of trees to be'cut:
Please see attached project narratrve
Please see attached project narrative
Please see attached prolect narrative
d. Type of structures and fill materials to be installed, and quantity of materials to be used (e.9., square feet of
volume of materialto bers no dredging proposed with this prolect
Acreage of trees to be cleared:
JonrAppucaror Fonu 08/16 Page? of 4
Jotrr Appuclnor FoRm - Continued. Submit this completed page as part of your Application.
Please see attached p@ect narrative
h. Describe the planned seouence of activities:
see attached project narratrve
k. Alternatives considered to avoid regulated areas. lf no feasible alternatives exist, explain how the project willminimize impacts:
see attached project narrative
l. Proposed use: [-l Private E puutic l-l Commercial
m. Proposed Start Date: TBD Estimated Completion Date: TBD
Please see attached project narrative
Erosion and silt control methods that will
[] Yes lf Y
The upland portion of the prolect is propsed to be on Suffolk County Park Land Additronally, work is proposed to be completedbelow the plain of spring high water and thus wrll be on land of NYS.
USACE, OGS or DOS Permit / numbers for activities at this location:
q. Willthis project require additional Federal, State, or Local authorizations, including zoning changes?
ll y", tf Yes, tist betow.
Jorxr Appuclnox Fonu 08/16 Page 3 of4
Jonr Appt-tcmol Fonna - Continued. Submit this completed page as part of your Application.
7. Signatures.Applicant and Owner (lf different) must sign the application.Append additional pages of this Signature section if there are multiple Applicants, Owners or ContacUAgents.
I hereby affirm that information provided on this form and all attachments submitted herewith is true to the best ofmy knowledge and belief.
Permission to lnspect - I hereby consent to Agency inspection of the project site and adjacent property areas.Agency staff may enter the property without notice between 7:00 am and 7:00 pm, Monday - Friday. lnspectionmay occurwithout the owner, applicant or agent present. lf the property is posted with "keep out" signs or fencedwith an unlocked gate, Agency staff may still enter the property. Agency staff may take measurements, analyzesite physical characteristics, take soil and vegetation samples, sketch and photograph the site. I understand thatfailure to give this consent may result in denial of the permit(s) sought by this application.
False statements made herein are punishable as a Class A misdemeanor pursuant to Section 210.45 of the NYSPenal Law. Further, the applicant accepts full responsibility for all damage, direct or indirect, of whatever nature,and by whomever suffered, arising out of the project described herein and agrees to indemnify and save harmlessthe State from suits, actions, damages and costs of every name and description resulting from said project. lnaddition, Federal Law, 18 U.S.C., Section 1001 provides for a fine of not more than $10,000 or imprisonment fornot more than 5 years, or both where an applicant knowingly and willingly falsifies, conceals, or covers up amaterial fact; or knowingly makes or uses a false, fictitious or fraudulent statement.
Date
I lza lnApplicant Must be (check allthat apply): l-Zloperator E Lessee
Printed Name
Nicholas Gibbons
Title
Principal Environmental Analyst
of Owner different than
Date
q/a/nPrinted Name
Thomas Schaefer, P.E.
Title
Associate
(gtiLF- 51^i.a[1;r6arJ FOQ
Date
Printed Name Title
JorrrAppt-rcAroN FoRM 08/16 Page 4 of 4
ENG FORM 4345
T
APPLICATION FOR DEPARTMENT OF THE ARMY PERMIT(33 CFR 325)
OMB APPROVAL NO. O71O.OO3
Public reporting burden for this collection of information is estimated to average 5 hours per response, rncludrng the time for reviewng instructrons,Searching existing data sources, gathering and maintaining the data needed, and completing and reviewi 'ng the collection of info rmation Sendcomments regardrng this burden estimate or any other aspect of this collectron of informa tion, including suggestrons for reduci ng this burden, toDepartment of Defense, Washington Headquarters Service Directorate of lnformatron Operatrons and Reports, 1215 Jefferson Davis Htghway, Sutte1204, Arlington VA 22202-4302, and to the Offrce of Management and Budget, Paperwork Reductron Project (0710-003), Washrngton, DC 20503.Please DO NOT RETURN your form to either of those addresses Completed applications must be submrtted to the Drstrict Engineer having jurisdiction
over the location of the orooosed activitv.
PRIVACY ACT STATEMENTAuthority' 33 USC 401 , Section 10: 1413, Section 404. Principal Purpose These laws require permrts authonzing activities i n, or affecting, navigablewaters of the Unrted States; the drscharge of dredged or fill material rnto waters of the United States, and the transportatron of dredged matenal for thepurpose of dumping it into ocean waters. Routine uses: lnformation provided on this form will be used rn evaluating the appli cation for a permit.
Drsclosure: Disclosure of requested informahon rs voluntary. lf rnformatron rs not provrded, ho wever, the permrt applcation cannot be processed norcan a permrt be rssued.
One set of ongrnal drawngs or good reproducible copres whrch show the location and character o f the proposed actrvity must be attached to thisapplication (see sample drawings and instructions) and be submrtted to the District Engineer hav rng Jurisdiction over the propo sed activity. Anapplicatron that is not completed rn full will be returned
ITEMS 1 THRU 4TO BE FILLED BY THE CORPS1. APPLICATION NO. 2 FIELD OFFICE CODE 3. DATE RECEIVED 4. DATE APPLICATION COMPLETED
ITEMS BELOW TO BE FILLED BY APPLIC5. APPLICANT'S NAMESuffolk County Department of Parks
8. AUTHORIZED AGENT'S NAME &TITLE (an agent rs not required)
D&B Engineers and Architects, P.C.
6. APPLICANT'S ADDRESSPO Box 144West Sayville, NY 1L796
9. AGENT'S ADDRESS330 Crossways Park DriveWoodbury, NY 1,1,797
7. APPLICANT'S PHONE NUMBERS WITH AREA CODE
a. Residence
b. Busrness 631-854 -4600
10. AGENT'S PHONE NUMBERS WITH AREA CODE
a. Resrdence
b. Business 515 - 3 64 - 9890
STATEMENT OF AUTHORIZATION11.
I hereby authonzeapphcation and to furnish, upon request, supplemental informaton in support of this pe rmit apphcation.
Please See Attached Authorization Form
to act rn my behalf as my agent rn the processing of this
APPLICANT'S SIGNATURE DATE
NAME. LOCATION. AND DESCRIPTION OF PROJECT OR ACTIVITY12. PROJECT NAME OR TITLE (see instructions)
Indian Island Living Shoreline
13. NAME OF WATERBODY, lF KNOWN (if applicable)Flanders Bay
14. PROJECT STREET ADDRESS(if apphcable)
fndian Point RoadRiverhead, NY 11901
15. LOCATION OF PROJECT
Suffolk New YorkCOUNry STATE
16. OTHER LOCATION DESCRIPTIONS, lF KNOWN (see Instructions)
fndian IsIand County Park
17. DIRECTIONS TO THE SITE
ENG FORM 4345_ ONLIN E CESPK-CO-R
18. NATURE OF ACTIVITY (Descriptron of project, include att features)Construction of a living shoreline, pl-ease see attached project narrative fordetails.
19. PROJECT PURPOSE(Describe the reason or purpose of the project, see instructions)
Please see aLtached project narrative.
USE BLOCKS 20-22IF DREDGED AND/OR FILL MATERIAL IS TO BE DISCHARGED20. REASON(S) FOR DTSCHARGE
P1ease see attached project narrative
21. TYPE(S) OF MATERTAL BE|NG DISCHARGED AND THE AMOUNT OF EACH TypE tN CUBTC YARDS
Please see attached project narrative.
22. SURFACE AREA lN ACRES OF WETLANDS OR OTHER WATERS FlLLEQsee instructions)Please see attached project narrative.
23. IS ANY PORTION OF THE WORKALREADY COMPLETE? YES C
NO o IF YES, DESCRIBE THE WORK
24 ADDRESSES OF ADJOINING PROPERTY OWNERS, LESSEES, ETC. WHOSE PROPERry ADJOINS THE W/ERBODY(lf more thancan be entered here, please attach a supplemental list)
Suffolk County MTA LIRRPO Box 144 Jamaica StationWest Salnrille, NY 1"L796 ,famaica, NY 11435
25. LIST OF OTHER CERTIFICATIONS OR APPROVALS/DENIALS RECEIVED FROM OTHER FEDERAL, STATE, OROCAL AGENCIESFOR WORK DESCRIBED IN THIS APPLICATION
AGENCY ryPE APPROVAL- IDENTIFICATION NUMBER DATE APPLIED DATE APPROVED DATE DENIED
" Would include but is not restricted to zonino. buildino and flood olain oermits.
26. Application is hereby made for a permit or permits to authorize the work described in this appl ication. I certify that the informationin this application is complete and accurate. I further certify that I possess the authority to undertake the work described h erein or amacting as the df{y authorized agent of the applicant.
__-a___J:_zJ4SIGNATURE OFURE OF APPLICANT DATE SIGNATURE OF A6ENT DATE
KVLE $AQtN6ea\)The applicaton must be signed by the person who desires to undertake the proposed activity (applicant) or it may be signed by a dulyauthorized agent if the statement in block 11 has been fllled out and signed.18 U S.C. Section 1001 provides that Whoever, in any manner within the jurisdiction of any department or agency of the UnitedStates knowrngly and will fully falsifies, conceals, or covers up any trick, scheme, or disguises a material fact or makes any false,facticious, or fraudulent statements or representations or makes or uses any false writing or document knowing same to contain anyfalse, fictitious or fraudulent statements or entry, shall be fined not more than S10,000 or imprisoned not more than five vear s or both
ENG FORM 4345 _ ONLIN E CESPK-CO-R
NANY FORM 201
Received
sEP I 1 2017
ENVI RO N M ENTAL QU ESTI O N N AI RE NYSDOSPlanning & Development
Ihis is intended to supplement ENG Form 4345, Application for Department of theArmy Permit, or the Joint Application for Permit used in the Sfafe of New York.Please provide complete ansvyers to all questions below which are relevant to yourproject. Any answers may be continued on separafe sheet(s/ of paperto be attachedto this form.
PRIVACY ACT STATEMENT
The purpose of fhis form is to provide the Corps of Engineers with basic informationregarding your project. This information will be used to facilitate evaluation of yourpermit application and for public dissemination as required by regulation. Failureto provide complete information may result in your application being declaredincomplete for processing, thereby delaying processrng of your application.
GENERAL..APPLICABLE TO ALL PROJECTS
1. Explain the need for, and purpose of, the proposed work.
The project consists of the construction of a living shoreline projectPfease see project narrative for details.
2. Provide the names and addresses of property owners adjacent to your work site(if not shown on the application form or project drawings).
Suffolk County, PO Box 144, West Sayville, NY 11796MTA LIRR, Jamaica Station, Jamaica, NY l-1435
(Please note that depending upon the nature and ertent of your project, you may berequested to provide the names and addresses of additional property ownersproximate to your project site to ensure proper coordination.)
3. Photographs of the project site should be submitted. For projects in tidal areas,photographs of the waterway vicinity should be taken at low tide. Using a separatecopy of your plan view, indicate the location and direction of each photograph aswell as the date and time at which the photograph was taken. Provide a sufficientnumber of photographs so as fo provide a clear understanding of conditions on andproximate to your proiect site. please see arrached
4. Provide a copy of any environmental impact statement, or any otherenvironmental report which was prepared for your project. please see attached
r
5. Provide a thorough discussion of altematives to your proposal. This discussionshould include, but not necessarily be limited to, the "no action" altemative andaltemative(s) resulting in less disturbance to waters of the United Sfafes, For fillingprojects in waters of the United States, including wetlands, your altemativesdiscussion should demonstrate that there are no practicable alternafives to yourproposed filling and that your project meets with current mitigation policy (i.e.avoidance, minimization and compensation).
The purpose of the project is to provide erosion conlrol, and ecosystemrestoratron/ enhancement. No practicable al-ternatives exist to achievethis goal.
DREDGING PROJECTS
Answer the following if your project involves dredging.
1. lndicate the estimated volume of material to be dredged and the depth (belowmean low water) to which dredging would occur. Would there be overdepthdredoino?
No dredging is proposed
2. You can apply for a ten-year permit for maintenance dredging. lf you wish toapply for a ten-year permit, please provide the number of additional dredging eventsduring the ten-year life of the permit and the amount of material to be removedduring future events.
3. lndicate of your drawings the dewatering area (if applicable) and disposal site forthe dredged material (except landfill sites). Submit a sufficient number ofphotographs of the dewatering and disposal sifes as applicable so as fo provide aclear indication of existing conditions. For ten-year maintenance dredging permits,indicate the dewateringldisposal sites for future dredging events, if known.
4. Describe the method of dredging (i.e. clamshell, dragline, etc.) and the expectedduration of dredging.
5. lndicate the physical nature of the material to be dredged (i.e. sand, silt, clay, etc.)and provide estimated percentages of the various constituents if available. Forbeach nourishment projects, grain size analysis data is required.
6. Describe the method of dredged material containment (i.e. hay bales,embankment, bulkhead, etc.) and whether return flow from the dewateringldisposalsite would reenter any waterway. Also indicate if there would be any barge overflow.
MOORING FACILITIES
Answer the following if your project includes the construction or rehabilitation ofrec reati onal m oori n g fac i I iti es.
1. lt is generally recommended that any fixed piers and walk ramps be limited to fourfeet in width, and that floats be limited to eight feet in width and rest at least two feetabove the watenray bottom at mean low water. Terminal floats at private, non-commercial facilities should be limited to 20 feet in length. lf you do not believe yourproposal can meet with these recommendations, please provide the reason(s).
no mooring facility exists or is proposed.
2. lJsing your plan view, show fo scale the location(s), position(s) and size(s)(including length, beam and draft) of vesse(s/ to be moored at the proposed facility,including those of transient vessel(s/ if known.
3. Forcommercial mooring sifes such as marinas, indicatethe capacity of thefacilityand indicate on the plan view the location(s) of any proposed fueling and/or sewagepumpoutfacilities. lf pumpoutfacilities are not planned, please discuss the rationalebelow and indicate the distance to the nearest available pumpout station.
4. lndicate on your plan view the distance to adjacent marine structures, if any areproximate and show the locations and dimensions of such structures.
5. Discuss the need for wave protection at the proposed facility. Please be advisedthat if a permit is r.ssue4 you would be required to recognize thatthe mooring facilitymay be subject to wave action from wakes of passing vesselg whose operationswould not be required to be modified. Issuance of a permit would not relieve you ofensuring the integrity of the authorized structure(s) and the United Sfafes would notbe held responsible for damages to the structure(s) and vessel(s) moored theretofrom wakes from passrng vessels.
B U LKH E AD I N G/ B AN K ST AB I LI ZATI O N /FI LLI N G ACTIVITI ES
Answer the following if your project includes construction of bulkheading (alsoretaining walls and seawalls) with backfill, filling of waters/wetlands, or any otherbank stabilization fills such as riprap, revetments, gabions, efc.
1. lndicate the total volume of fill (including backfill behind a structure such as abulkhead) as well as fhe volume of fill to be placed into waters of the United Stafes.The amountof fill in waters of the United States can be determined by calculating theamount of fill to be placed below the plane of spring high tide in tidal areas andbelow ordinary high water in non-tidal areas.The proposed bulkhead wil-I be covered with approximately 2,000 CY ofcompatible fiII. An additional- approximate l-,500 CY of fill will placedbelow SHW to enhance/create marsh areas as part of the Iiving shorelineoroi ect .
2. lridicate the source(s) and type(s) of fill material.The material is proposed to be clean compatible fill from an upland source.
3. lndicate the method of fill placement (i.e. by hand, bulldozer, crane, etc.). Wouldany temporary fills be required in waterways or wetlands to provide access forconstruction equipment? lf so, please indicate the area of such waters and/orwetlands to be filled, and show on the plan and sectional views.
The fill will be placed by mechanical means by the use of a bulldozer, front end load or excavator.
temporary fills are proposed to be necessary.
The foregoing requesfs basic information on the most common Upes of projectsrequiring Department of the Army permits. lt is intended to obviate or reduce theneed for requesting additional information; however, additional information may berequested above and beyond what is reguested in this form.
Please feel free to add any additional information regarding your project which youbelieve may facilitate our review.
FEDERAL CONSISTENCY ASSESSMENT FORM
NEW YORK STATE DEPARTMENT OF STATECOASTAL MANAGEMENT PROGRAM
r Received
sEP I 1 2017
NYSDOSPlanning & Development
Federal Consistency Assessment Form
An applicant, seeking a permit, license, waiver, certification or similar type of approval from a federal agency which is
subject to the New York State Coastal Management Program (CMP). shall complete this assessment form for any
proposed activity that will occur within and/or directly affect the State's Coastal Area. This form is intended to assist an
applicant in certifying that the proposed activity is consistent with New York State's CMP as required by U.S. Department
of Commerce regulations (15 CFR 930.57).It should be completed at the time when the federal application is prepared.
The Department of State will use the completed form and accompanying information in its review of the applicant's
certifi cation of consistency.
A. APPLICANT (please Print)
l.Name: Suf fol-k County Parks Department
2.Address: PO Box l-44 West Sayville, NY 11795
3. Telephone: Area Code ( 631-854-4500
B. PROPOSED ACTIVITY
l. Brief description of activity:
Construct fiving shoreline project. pfease see attached projectnarrative.
2. Purpose of activity:
please see attached project narrative
3. Location of activity:
Suffolk Riverhead Indian Point Road
County City, Town, or Village Street or Site Description
4. Type of federal permit/license required: Letter of Permission
5. Federal application number, if known:
6. If a state permit/license was issued or is required for the proposed activity, identify the state agency and provide
the application or permit number, if known:
C. COASTAL ASSESSMENT Check either "YES" or "NO" for each ofthese questions. The numbers following each
question refer to the policies described in the CMP document (see footnote on page 2) which may be affected by the
proposed activity.
l. Will the proposed activity result in any of the following: YES NO
a. Large physical change to a site within the coastal area which will require the preparation
of an environmental impact statement? (1 l, 22, 25, 32, 37, 38, 41, 43)
b. Physical alteration of more than two acres of land along the shoreline, land
under water or coastal waters? (2, 11, 12,20,28,35, 44)
c. Revitalization/redevelopment of a deteriorated or underutilized waterliont site? (l)d. Reduction of existing or potential public access to or along coastal waters? (19, 20)
e. Adverse effect upon the commercial or recreational use of coastal fish resources? (9,1 0) . . .
f. Siting ofa facility essential to the exploration, development and production ofenergyresources in coastal waters or on the Outer Continental Shelfl (29)g. Siting of a facility essential to the generation or transmission of energy? (27)
h. Mining, excavation, or dredging activities, or the placement of dredged or fill material incoastal waters? (l 5, 35) Xi. Discharge oftoxics, hazardous substances or other pollutants into coastal waters? (8, 15, 35)j. Draining of stormwater runoff or sewer overflows into coastal waters? (33) . . .
k. Transport, storage, treatment, or disposal of solid wastes or hazardous materials? (36, 39)
l. Adverse effect upon land or water uses within the State's small harbors? (4) . . . .
2. Will the proposed activity affect or be located in, on, or adjacent to any of the following: YES NO
a. State designated freshwater or tidal wetland? (44) . . .
b. Federally designated flood and/or state designated erosion hazard area? (l l, 12, 17,) . . . . .
c. State designated significant fish and/or wildlife habitat? (7) . . . .
d. State designated significant scenic resource or area? (24) . . .
e. State designated important agricultural lands? (26)
f. Beach, dune or barrier island? (12) . . .
g. Major ports of Albany, Buffalo, Ogdensburg, Oswego or New York? (3)
h. State, county, or local park? (19, 20) . . .
i. Historicresource listed ontheNationalorStateRegisterof Historic Places? (23)........
3. Will the proposed activity reouire any of the following: YES NO
xxxx
xx
xxxx
x-xx
x
xx
x
x
a. waterfront site? (2,21,22)b. Provision ofnew public services or infrastructure in undeveloped or sparsely populated
sections ofthe coastal area? (5)c. Construction or reconstruction of a flood or erosion control structure? (13, 14, 16) . . . . . . .
d. State water quality permit or certification? (30, 38, 40) . . .
e. State air quality permit or certification? (41, 43)
4. Will the proposed activity occur within and/or qffu! an area covered by a State approved local
waterfront revitalization program? (see policies in local program document)
_x
x_
x
_xx_x_
x
D. ADDITIONAL STEPS
l If all of the questions in Section C are answered "NO', then the applicant or agency shall complete Section
E and submit the documentation required by Section F.
2.lf any of the questions in Section C are answered "YES", then the applicant or agent is advised to consult the CMP,or where appropriate, the local waterfront revitalization program document*. The proposed activity must be analyzed
in more detail with respect to the applicable state or local coastal policies. On a separate page(s), the applicant or agent
shall: (a) identifu, by their policy numbers, which coastal policies are affected by the activity, (b) briefly assess the effects
of the activity upon the policy; and, (c) state how the activity is consistent with each policy. Following the completion
of this written assessment, the applicant or agency shall complete Section E and submit the documentation required by
Section F.
E. CERTIFICATION
The applicant or agent must certifr that the proposed activity is consistent with the State's CMP or the approved local
waterfront revitalization program, as appropriate. If this certification cannot be made, the proposed 49!yj$@!|4|@undeftaken. If this certification can be made, complete this Section.
"The proposed activity complies with New York State's approved Coastal Management Program, or with the applicable
approved local waterfront revitalization program, and will be conducted in a manner consistent with such program."
Applicant/Agcgls 5u*"' D&B Engineers and Architects , P ' C '
4661sss.330 Crossways Park Drive, Woodbury, NY l-1797
Telephone: Area Code f 0 3 ll-: ]a : t1-i ! :9
ApplicanvAgent's S ,gnutur", 4, LAI/ out",q/6/t\
F. SUBMISSION REQUIREMENTS
I . The applicant or agent shall submit the following documents to the New York State Department of State, Office ofCoastal, Local Government and Community Sustainability, Attn: Consistency Review Unit, I Commerce Plaza -
Suite 1010, Albany, New York 12231.
a. Copy of original signed form.b. Copy of the completed federal agency application.
c. Other available information which would support the certification of consistency.
2. The applicant or agent shall also submit a copy of this completed form along with his/her application to the federal
agency.
3. If there are any questions regarding the submission of this form, contact the Department of State at
(518) 474-6000.
*These state and local documents are available for inspection at the offices of many federal agencies, Department of environmental
Conservation and Department of State regional offices, and the appropriate regional and county planning agencies. Local program
documents are also available for inspection at the offices ofthe appropriate local govefirment.
C \OFFICE\WPWIN\WPDOCS\fCAf2 (revrsed l0/29108)
FCA SUPPLEMENT FORM
Federal Consistency Application Form Supplement
Applicant: Project Location:Suffolk County Parks Department Indian Island Suffolk County ParkPO Box 144 Indian Point RoadWest Sayville, NY 11796 Riverhead, NY I l90l
Project Description:This project consists of the construction of a living shoreline project.
POLICY ANALYSIS:
POLICY 44This activity is consistent with the above coastal policy, because it is a generallycompatible activity under the Tidal Wetland Regulations.
POLICIES tt,t2,,t7The project is located on Flanders Bay. The project will have no adverse impact on thebay. The project will in no way increase potential property damage due to flooding.
POLICY 12
The project is located on a beach. The project will have a positive benefit to the beacharea and surrounding ecosystem.
POLICIES 19,20The proposed project is located in Suffolk County Parkland on Indian Island. Theproposed project will not affect the use of the park.
POLICIES 2,21,22The project will not inhibit water dependent recreation in the area. Other uses of thecoast such as scientific research, wildlife viewing, boating, fishing etc., will not be
limited in any way.
POLICIES 13, 14,16The project is generally compatible with above these policies. The proposed project isdesigned to last more than 30 years and will not increase erosion or flooding at thesubject site or at sites adjacent to the subject site.
POLICIES 30,38,40The project will require a state water certification. The effects will only be short term andthe project will ultimately have a beneficial effect on water quality.
POLICIES 15,35The project is generally compatible with above these policies. The proposed actions willnot affect coastal processes and will not increase erosion at the subject site or at sites
adjacent to the subject site.
DOSFCAFS2
SITE PLAN/CROSS SECTION
3
:5
Iiq
E
B
\
+I
t
I
a/ ''l-
a
-1
s./ -'
, i.*. ""'ee
t4 -' '1
CREAT|ON OF tNEW MARSH --J-/
#'/oo" iim--Il*E*/
,8
@:' ;.
a
RO,eK"S|LL #1.\ffi
*!
eIioo td.rq.r 1\ ,/a- \".,)s\q_o
*' .? .+9' g =.' o*oor-6 *s $ttto.u ''#O CANTILEVERET
, i:r 6 PVc BULKHE
" O -coote eAsELr!{E-a
-
F<'11"^"*^_ -. .$*
&4"o,
.2 oNOo
..& -f\
.*?
unao.
CREATIONNEW MAR
I\\
\ o*F
--*-+---t'orr\Nu)- *----'-FA---"+
a+00 --"*'4.
Lr*
o
s*@
In
7\\
a
.t
\D
*ol
OFSH-
g-''-jx-
. RE.STORATIO
: :. ', ollExtsIN(I ;r.1 ys511-it-.1' .. , '
a{0
-:-+/_-ts "*:
';--..t ''
I .,I ,,
!-- euencenr
i RocK srLL #2
l.* :: ',,r r"{: ,,:,'l:li::::*.if.
,a r.: : ..-i' .;&.
q1ootlI
/ !:oo
Xno
trco
qalro
9q,EMERGENIROCK SILL #3
-\k$a
. UNAUTHORIZED ALIERATION ORADOITION TO THIS DOCUMENT IS A
VIOLATION OF SECTION 7209 OF THENEW YORK STATE EDUCATION LAW. tr I-?$ E\CI\EEP..^
L-l- /ARCHITECTS,PC.
SUFFOLK COUNTY DEPT. OF PUBLIC WORKSSUFFOLK COUNTY NEW YORK
PROPOSED SITE PLAN
3328
1PROJECT ENGINEER
TS )EZ
DAIE
[{AY 2017
INDIAN ISLAND COUNTY PARKEROSION M!TIGAT!ON
DES GNED BY
TS
CHECKED BY.
JS
SCALE
'l "=60'NO REVlSION NT
I
g
E
E&
:q
12
10
I
6
1
2
0
I
6
-12l,ol16l.].i12
'1
I01.,--1
J4l6
'14
12
't0
1
0
-2
I
14
12
t0
E
6.
1
2
0
-2
I
11
10
8
6
1
2
0
-2
4
6
{-10
-12
-14
12-t-
t0 If-8l5E
11rI
2+1-
OF1-
-2+F4r
6Et-if
10EI125l-,o I
16f0+00
to
8
6
I
2
U
-4
-6
.E
-10
-11
-16
0+m 3+00 ,l+00
PROFILE BASELINE 1
SCALe 1'= 60
PROFILE BASELINE 5' SCA|E: l'= 0O
12
10
6
6
4
2
o
-2
I
12
10
E
6
4
2
0
-2
1
11
12
10
E
1
2
0
-2
4
{-8
,10
-12
-11
5+00
PROFILE BASELINE 8SCAIE: 1'= gI
PROFILE BASELINE 2SCALE: 1'= s
30.00',12
l0
8
6
1
2
0
:2
I
12
10
8
6
4
2
0'
4
0+C,0 3+00
PROFILE BASELINE 6SCAIE: l'= 60
PROFILE BASELINE 3
12
10
8
6
1
2
0
-1
-6
-8
-10
-12
-14
."I,oI,l,I.I,I,t,I"l.I,-] -'ol).,,l
].nr -,.
SCALE: 1'= flI
12
t0
8
6
4
2
0
I
12
10
I
6
1
2
0
I
0+00 3+00
PROFILE BASELINE 7
PROFILE BASELINE 4SCAIE: 1'= 60
SCr{-E: 1' = 6(}
60 30 0 60'
=EE-
e
P'
. UMUTHORIZEO ALTERANON ORAOOITION TO THIS OOCINENT IS A
VIOLATION OF SECTION 7209 OF THENEWYORK STATE EDUGATIO'.I LAW. D&B EUCINEERS
ANDARCHITEC|S, P.C.
SUFFOLK COUNTY DEPT. OF PUBLIG WORKSSUFFOLKCdJNTY NEWYORK
PROPOSED PROFILES
PRAECTrc
3:t28
1PRQECI rcINEER
TS J?2
OAE
tAY m17
INDIAN ISLAND COUNTY PARKEROSION MITIGATION
DESIdEDAY
TliHECreO BY:
JS
SCAE
t=6(}rc UE REUSION tNt
PHOTOGRAPHS & LOCATION MAP
PROJECT NARRATIVB
Indian Island Suffolk County ParkProposed Living Shoreline Project
Project Narrative
Summary
The Indian Island Suffolk County Park living shoreline project is proposed as an environmentallysustainable method of providing protection, resiliency and stabilization to the coastal ecosystem
(upland and wetland habitaQ through the creation of natural and nature-based features (NNBF)within the Indian Island area. The Indian Island area has been experiencing chronic loss to the
bluff, .shoreline, and marshes. These losses are critically threatening important infrastructure(Circle Drive), navigation, and destroying productive marsh habitat.
The bluff in several key locations on Indian Island is experiencing ongoing, catastrophic and
irreversible bluff loss that is resulting in a landward migration of the bluff threating the collapseof Circle Drive. Suffolk County has been forced to frequently place sand to keep the road frombecoming undermined. Additionally, the marsh areas within Indian Island have been experiencingsignificant loss, reducing their size resulting in a loss of vital and productive tidal wetland habitat.
The project is proposed to provide increased protection to the area against flooding/erosion,stabilization of the shoreline and navigation channel, and restoratiorV enhancement of the regionalecosystem, marsh and waterbody. The proposed living shoreline project contains three livingsegmented emergent rock sills, marsh habitat restoration/ enhancement consisting of compatiblebeach nourishment fill planted with wetland vegetation, and bluff stabilization consisting of an
upland cantilevered PVC bulkhead covered with compatible fill and planted with beach grass.
l. Living segmented emergent rock sills - three living segmented emergent rock sillsare proposed to be placed within the nearshore region of Flanders Bay. The "living"aspect of the sills is proposed to be accomplished by seeding them with encrustingshellfish such as oysters to increase habitat and water quality.
2. Marsh habitat restoration/ enhancement - existing marsh headlands within the area
are proposed to be stabilized with the addition of coir logs and aquatic vegetationplanting and invasive plants will be removed. Additional, marsh areas are proposed tobe created landward of the living sills by the placement of approximately 1,500 CYbeach compatible fill planted with aquatic vegetation.
3. Bluff Stabilization- A cantilevered PVC bulkhead is proposed to be installed in theexisting the bluff landward of the spring high water. The bulkhead is proposed to be
covered with approximately 2,000 CY beach compatible fill and planted with beachgrass.
Indian Island Suffolk County ParkProposed Living Shoreline ProjectProject Narrative - August 2017Page I of6
D&B Engineers and Architects, P.C.First Coastal Corporation
1. Living segmented emergent rock sills
The proposed segmented, emergent, living rock sills are proposed to provide increased protectionto the shoreline and bluff of Indian Island against high frequency storm events containing moderatesurge and wave heights. Storm energy will be dissipated as waves impact the structures.Additionally, the sills are designed to increase sand retention landward of structures resulting inan increase in the elevation of the beach that will further dissipate wave energy and limit waveinteraction with the toe of the bluff.
The sills are also proposed to provide stabilization of the shoreline and existing marsh headlandsin the area as well as create additional sheltered regions to facilitate the establishment of new marshareas. The sill will also limit possible infilling of the existing navigation channel located to thenorth of Indian Island at the entrance of Meetinghouse and Terry Creeks by entrapping sand.
The living rock sills themselves will also provide productive rocky subaqueous marine habitat forfinfish, shellfish, marine invertebrates, seaweeds, etc. Furthermore, the living rock sill areas areproposed to be seeded with shellfish such as oysters that through their filter feeding will improvewater quality.
The proposed project will consist of three living segmented emergent rock sills that areapproximately l5- 25 feet from the shoreline depending on their location and configuration (Pleasesee attached plan for proposed location). These sills are the minimum size necessary to provideprotection to the fringe wetlands. The sills proposed are emergent; therefore they will be abovewater level during high tide. The sills are proposed have a top elevation of +1.5' NAVD88. Atthe Indian Island site the MHW is approximately +1'NAVD88 and MLW is approximately -2'.NAVD88. Therefore, at MHW the sill will be exposed by approximately half a foot and at MLWthe sill will be exposed by approximately 3 feet.
The sills are proposed to have a crest width of 10 feet and will slope down on either side (seawardand landward) on a I to 1.5 slope where they will tie into the shoreface. The base width of thesills will vary from approximately 20-25 feet depending on the depth of water that the sill is locatedin.
The sills will be constructed of natural quaffy stone and will be underlain by filter fabric. Filterfabric will be placed down that will then be covered with natural quarry bedding stone that isapproximately 8" in diameter and two feet thick across the foot print of the sills. The core andarrnor stone will then be placed into the approved configuration.
2. Marsh habitat restoration/ enhancement
The proposed marsh habitat restoration and enhancement will provide increased stability andresiliency to the shoreline. The habitat restoration will enhance the existing marsh area to reduceloss, improve progression of the marsh, and sustain the vital native marsh habitat and ecosystemof the region. The habitat enhancement will create new areas of tidal wetland marsh that did notexist prior to the project that will additionally stabilize the area and will create new regions ofessential marsh habitat to increase the productivity of the local ecosystem.
Indian Island Suffolk County ParkProposed Living Shoreline ProjectProject Narrative - August 2017Page 2 of 6
D&B Engineers and Architects, P.C.First Coastal Corporation
The marsh restoration of the area will consist of the addition of coir logs and wetland vegetationplanting to stabilize the existing marsh areas of Indian Island. It will also consist of the removal
of invasive plant species within the marsh. Additional, marsh areas are proposed to be created
landward of the living sills by the placement of approximately 1,500 CY of beach compatible fillin the identified areas planted with wetland vegetation.
3. Bluff Stabilization
Bluff stabilization is proposed to provide protection to the bluff, upland property and the keyinfrastructure of Circle Drive, the access road to Indian Island. Bluff stabilization is proposed toprovide protection against low frequency episodic storms with large waves and storm surges thatwill inundate the sills and beach allowing for direct wave action on the bluff.
As part of the bluff stabilization a cantilevered PVC bulkhead is proposed to be installed in the
existing bluff face seaward ofthe bluff crest and landward ofthe blufftoe above spring high water.The bulkhead will provide protection against catastrophic bluff loss and the potential underminingof Circle Drive during these large storms.
The bulkhead is proposed to be covered with approximately 2,000 CY of beach compatible sand
and is to be planted with beach grass three clums per hole 12" on center. Covering the bulkheadwith sand and planting it will allow for it to be there for protection while still allowing for a naturaldune to become established in the area to enhance the native ecosystem.
Bluff Loss On Property
The bluff on the subject property is experiencing ongoing, catastrophic and irreversible bluff loss.This bluff failure is resulting in a landward migration of the bluff on the subject property. TheSuffolk County Parks Department has then be forced to frequently place upland sand on the bluffin several locations to provide protection to Circle Drive from undermining and collapse.
The bluff loss is a result of wave action at the toe of the bluff which leads to:l) undercutting of the bluff toe2) over steepening of the bluff face3) undercutting of the bluff crest4) the eventual collapse and slumping of the bluff crest threatening Circle Drive
This bluff loss on the subject property is evident by:l) the vertical soarps at the toe of the bluff caused by wave action undercutting the toe ofthe bluff2) the bare soils and lack of vegetation present on the bluff face3) the undercut/overhang present on the bluffcrest4) free floating islands of vegetation on the bluff face that have broken off and are movingdownslope. In several areas of the bluff large rafts of the undercut bluff crest that havefailed and slumped on to the lower portions of the bluff.
Indian Island Suffolk County ParkProposed Living Shoreline ProjectProject Narrative - August 2017Page 3 of6
D&B Engineers and Architects, P.C.First Coastal Corporation
There is little to no evidence of bluff erosion due to stormwater runoff over the crest of the bluffor groundwater seepage through the bluff face. Although both of these mechanisms can destabilize
the bluff, neither appear active at the site and bluff appeared mostly susceptible to damage by wave
undercutting and subsequent catastrophic failure as described above.
Marsh Loss On Property
The marsh areas within Indian Island have been experiencing significant loss. The existing marshhas been degraded and is a fraction of its historic size. Wave action and ice undercutting on themarsh area is resulting in loss of the marsh headlands soils and vegetation. Without protection itis likely that the some marsh areas will be completely destroyed in the near future, resulting in aloss of vital and productive habitat, as well as increased exposure of the bluff.
Indian Island Suffolk County ParkProposed Living Shoreline ProjectProject Narrative - August 201 7
Page 4 of6
D&B Engineers and Architects, P.C.First Coastal Corporation
Increased Tidal Wetland Habitat
There are numerous scientific and scholarly reports/documents that have been released in recentyears that identify the benefit of living shoreline projects on tidal wetland habitat. Thesedocuments identify that the NNBF of living shorelines result in an increase in habitat, ecologicalproductivity and water quality for numerous species included but not limited to finish, shellfish,marine invertebrates, macro algae, migratory/wading birds and reptiles. These reports recognizethat generally there is an increase in tidal wetland habitat and productivity for a living shorelineproject when compared to the preexisting condition.
The NYSDEC recently released the "DRAFT Tidal Wetlands Guidance Document LivingShoreline Techniques in the Marine District of New York State, December 27,2016" to provideguidance on the issuance of permits for living shoreline techniques and discusses the beneficialuse of living shorelines. Furthermore, the USACE recently released a Nationwide Permit (54) forLiving Shorelines.
Indian Island Suffolk County ParkProposed Living Shoreline ProjectProject Narrative - August 2017Page 5 of6
D&B Engineers and Architects, P.C.First Coastal Corporation
The following relevant documents have been attached that identify the benefit of the NNBF ofliving shorelines on tidal wetland habitat:
o NYSDEC DRAFT Tidal Wetlands Guidance Document Living Shoreline Techniques inthe Marine District of New York State, December 21,2016
o USACE Nationwide Permit 54 Living Shorelineso Stevens Institute of Technology - Living Shoreline Engineering Guidelines, Prepared for
the New Jersey Department of Environmental Protectiono Department of Marine Sciences University of Connecticut- Design Considerations for
Living Shoreline in Connecticuto Spencer Rogers North Carolina Sea Grant - Living Shoreline Marsh Sill Designo NY Sea Grant Workshop on Living Shoreline for Coastal Erosion Protection May 2013-
http://seagrant.sunysb.edu/articles/t/workshop-living-shorelines-for-coastal-erosion-protection-in-a-changing-world-marine-coastal-processes-facilities-marinas-news
Need for Sill and Retaining Wall
As part of this project modeling was undertaken, the modeling report is included under separate
cover (Indian Island, NY Numerical Modeling Wave Analysis - December 2016). The modelingidentihes that the proposed breakwaters are most effective in attenuating wave energy for highfrequency storms containing moderate surge/ wave setup ( 1 in 10 year storm with l0% chance ofoccurrence annually). The reduced wave conditions resulting from the breakwaters will helpreduce shoreline erosion and help reduce need for beach nourishment during these moderatesurge/wave setup events.
Additionally, the analysis identified that when the breakwaters are submerged during large stormsthat their wave attenuation decreases. Therefore, in order to protect against large weather eventsthe proposed bulkhead landward is necessary to ensure that further bluff loss and potentialendangerment of Circle Drive does not occur. Moreover, since the modeling identifies that duringlarge scale storms with a wind direction of 90 deg the east facing shoreline is exposed to the largestwave energy, a retaining wall/bulkhead across this entire area is justified.
Therefore, this modeling demonstrates the benefits of the breakwater in reducing annual fill andthe need for the sill and the retaining wall as well as the necessary length of the retainingwall/bulkhead.
Decreased frequency of fill placement
The modeling confirms that during high frequency storms containing moderate surge/ wave setupthat the breakwaters significantly decrease wave energy transmission to the shoreline and bluff.Therefore, during these common event that historically lead to bluff and beach loss, the proposedaddition of the breakwaters will reduce the loss to the bluff, resulting in a decrease in the frequencyof placing hll.
Indian Island Suffolk County ParkProposed Living Shoreline ProjectProject Narrative - August 2017Page 6 of6
D&B Engineers and Architects, P.C.First Coastal Corporation
MODELING ANALYSIS
INDIAN ISLAND NUMERICAL MODELING
DECEMBER 2015
IND!AN !SLAND NY
NUMERICAT MODELING WAVE ANALYSIS
DRAFTO1 GENERAL
This is a summary of the numerical modeling analysis conducted to evaluate the wave conditions
on the Eastern shoreline of lndian lsland located in the Town of Riverhead, Suffolk County, NY
(Figure 1). Various storm conditions were simulated through numerical modeling and the wave
climate assessed for each case to evaluate the level of shoreline protection from the proposed
project including two breakwaters (BW). The preliminary results are presented herein for your
conslderation. The modeling results confirm thatthe proposed breakwaters are most effective in
attenuating waves from high frequency storm events containing moderate surge/wave setup.
The reduced wave conditions will help reduce the shoreline erosion and help reduce the need
for beach nourishment.
02 NUM ERICAT MODEL
O2.O1 MODET TNPUT
The local bathymetry for the project area was provided by Gayron de Bruin Land Surveying and
Engineerlng, PC in a recent survey and the regional bathymetry was taken from the 1955 NOAA
dataset. The numerical model was set up with and without the two proposed breakwaters with
crest elevation at +0.5m (+1.5ft NAVD88). Figure 1 shows a color coded contour map for both
regional and local bathymetry. Depth within the marina ranges from 8 m in the Peconic Bay toaround 1m near lndian lsland.
The numerical model used to conduct the analysis was CMS-Wave, a component of the Coastal
Modeling System developed by the US Army Corps of Engineers Coastal and Hydraulics
Laboratory. CMS-Wave is a 2-D wave spectral transformation phase averaged model suitable for
coastal and inlet modeling. The model allows for nested cells which permltted the use of larger
cells away from the Park (100m) and finer cells in the vicinity of the Park (1.5m)where details are
more relevant to the study. The model domain and cell detail are presented in Figure 1. The
modelwasset upto cover most of the Great Peconic Bay including lndian lsland.
HUMISTON & MOORE ENGINEERS
7.85.756.05.214.5
J,U
2.2e1.5
0.750.0
eIFCLUoE,UF
=Brea
(crest @ +0;
Figure 1: Project Location & Model Domain
INDIAN ISLAND NUMERICAL MODELING
DECEMBER 2016
The CMS-Wave model is able to determine the wave height from hindcast, using wind velocity
and local and regional basin geometry and bathymetry as input. The model input wind speeds
were derived from the Westhampton Airport 30-yr wind record. The storm surge was obtained
from the FEMA Flood lnsurance Study (FlS). The model input wind speed and surge extractedfrom the SLOSH model at the lndian lsland Park location is summarized in Table 1 below.
Table 1- CMS-Wave Model lnput
The numerical model was first set up to simulate the various storm categories for incoming wind
directions ranging from 0' (North) to 180" (South) on a 10" increment. This was done todetermine the direction from which the resulting wave heights are the highest. The simulation
also included storm surge.
02.02 MODEL RESUTTS
The numerical model results are summarized in Figure 2. ln the figure, the model results are
extracted at a location landward of the north breakwater and plotted over the various storms
and wind directions modeled. Overall, the results show that wind from the East (90') generates
the largest waves and the storm surge significantly affects the effectiveness of the breal<waters.
The graph in the figure shows that during 50 and 100 year storm conditions, wave attenuationfrom the structures is negligible, while waves from the 90' direction are attenuated by
approximately 25% during a 10 year storm with associated storm surge. Figures 3 through 5
show the model results for the respective 3 storm case scenarios (1O%,2% and 1% storms). ln
the figures, the resulting wave heights are represented in a color coded scale from blue to red
with red capped at 1m, specific conditions modeled are described at the bottom.
While a storm surge was evaluated forthe storm cases, the surge may only materialize when the
storm generated winds are coming from the optimal direction, otherwise lower levels of storm
surge may occur. Additionally, higher frequency storm events may also result in limited to no
surge. ln order to assess the effectiveness of structures during these more frequent conditions,
another set of model runs were prepared for cases with limlted surge (+0.5m). The simulations
considered increasing wind speeds from the East (90") both with and without the proposed
structures. The results are summarized in Figure 6, they show that the proposed structures will
HUMISTON & MOORE ENGINEERS
0.9
0.8
0.7
---10-yrStorm-BW10-yr Storm - Existing
50-yr Storm - BW
- - - 50-yrStorm - Existing
100-yr Storm - BW
- - - 100-yrStorm - Existing
3 o.u
3CO
Qr o'5
tu!'d 0.4Eo
5 o,
0.2
0.1
0
40 50 60 70 80 90 100 110 120 130 140 1s0
lncoming Wind Direction (Degrees from True North)
160 170 180
Notes:1. Surge elevations based on FEMA FlS.
2. Wind speed based on WesthamptonAirport 1986-2015 record.
Wind Direction
Figure 2: CMS-Wave Model Results for Existing Conditions &Breakwater Project during 10, 50 & 100 Year Storms
1.0
0.s
0.8
0.7
0.6
tt.5
0.4
n.3
0.2
0.1
tFE(9lrJIU
=
- Wind Direction 90'+- (gtm/s) Tide/SurBe:1.2m
Figure 3: CMS-Wave Model Results - LO-Year Storm
1.0
0.s
0.8
0.7
0.6
[.50.4
0.3
o.7
0.1
tFxIIJTlrJ
B
- Wind Direction 90"=t?'nil Tide/Surge: 1.5m
Figure 4: CMS-Wave Model Results - 50-Year Storm
1.0
[.s0.8
0.7
0.6
050.4
[.3
o.2
tl.1
FTIt!EIJ
=
- Wind Direction 90'+- (ggm/s) Tide/Surge: 1.8m
Figure 5: CMS-Wave Model Results - 100-Year Storm
o.7
0.6 - * BW-0.5mSurge
Existing - 0.5m Surge
E o.s
3co
@r o4
i.H o.sIo
i o,
0.1
20 30Wind Speed (m/s)
40 50 60
Plot #1
-
ProposedBreakwaters
E Wave ExtractionPoint
Figure 5: CMS-Wave Model Results for Existing Conditions & BreakwaterProject without Storm Surge & Moderate Surgefiide
Plot #1
1.0
t:t.3
rl.8
ll.6
0.5
L''1. il
0.3
rl.2
0.1
=FI(,l!IU
=
INDIAN ISLAND NUMERICAL MODELING
DECEMBER 2015
provide wave sheltering during typical conditions and high frequency storm events. This should
result in lower erosion rates and increased protection of upland sites.
An additional set of model run were prepared for the modified design using three breakwatersegments. Figure 7 shows a sample of the results with a comparison of the wave height forexisting conditions, the proposed design and the modified design. The storm condition modeled
in the example consists of a limited storm surge /tide of 0.5m and 30 m/s winds. ln the figure,
the wave field was extracted along a profile that follows the shoreline of the island and is plotted
in a graph for the three design conditions. The results suggest that a more linear structure design
could allow for the addition of a third structure, which would lncrease the wave sheltering effect
on the island. This alternative is provided as a suggestion for consideration.
03 coNcrusroN/REcoMM ENDATToN
The report provided a review of the existing data available at the project site. The Army Corp
CMS-Wave model was set up and run for various storm conditions. Based on the model results
discussed above, the following observations and recommendations are provided:
o When the water level resulting from storm surge and tide combination is higher than thestructure's crest, the wave attenuation function of the structures is significantly reduced.
o The proposed breakwaters will help reduce wave induced shoreline erosion in their lee
during typical conditions, high frequency storms or storm conditions that do not include
significant storm su rge.
o The proposed design could be modified to protect a largersection of shoreline by slightly
reducing the gap between structures and re-configuring the 2 proposed segments into
three more linear segments with overall same cumulative length.
HUMISTON & MOORE ENGINEERS
o.7
0.6
0.5
SEGMENT #2 SEGMENT #3E
E
-g.9po-oIE
=
0.4
0.3
o.2
0.1
0
- tyistipg fonditions
- p1sps5sfl Design
i'l:i Modified Deslgn
L00 1s0 200
Distance Along Profile (m)
- Wind Direction 90"-- (gom/s) Tide/Surge:0.5m
1.0
0.9
0.7
0.6
0.5
fr4
0.3
0.2
iJ.1
tF-IuEIU
=
Figure 7: CMS-Wave Model Results - Modified Design
PRELIMINARY EROSION MITIGATION REPORT
