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HomeMy WebLinkAboutOak Island Renourishment Project_Appendix D- Stakeholder Meeting MinutesOak Island 2019/2020 Renourishment Project August 7, 2019 2 PM Town of Oak Island Stakeholder Meeting Attendees participating via phone: Ken Willson (APTIM), Eric Olsen (Olsen & Associates), Tom Jarrett (APTIM) Purpose of the meeting was to inform and request feedback from local neighboring communities and representatives including, Bald Head Island, Fort Caswell and Caswell Beach, of Oak Island's intent to request federal and state authorization to dredge approximately 1Mcy of beach compatible sediment from Jay Bird Shoals and place along approximately 4 miles of oceanfront shoreline in the winter of 2019/2020. A list of attendees participating in person and via phone is provided at the end of the meeting summary. Katie Finegan and Johnny Martin, coastal engineers with Moffatt and Nichol, presented an overview of the project on behalf of the Town of Oak Island, including details of the ongoing offshore geotechnical field investigations, borrow area sediment compatibility results within Jay Bird Shoals and other areas investigated, extent and template design of the placement area, modeling results and anticipated construction schedule. The presentation is provided as a pdf attachment to this meeting summary. This summary provides a bulleted list of questions and concerns brought up during the discussion: • What is the expected design template after equilibration based on the absence of a berm? o Johnny Martin explained the placement template was designed based on the amount of funding available to build the initial project. o There is no existing dune remaining within the placement reach due to recent storms. This project will help build up the dune to provide as much level of protection for existing infrastructure until a larger project can be funded and built. o Future projects will include a berm. o It was confirmed a 14 ft dune was present in 2014. • Johnny Martin confirmed that Oak Island is aware of concerns of using Jay Bird Shoals due its proximity to the oceanfront shoreline of Fort Caswell (approximately 1 mile offshore). Delft 3D modeling of waves and currents was conducted to evaluate worst case scenario if the entire borrow area template (approximately 2.89 Mcy) were to be dredged. o Modeling results confirmed highly localized change of tidal currents (0-0.2 ft/sec) based on instantaneous peak flood tide on the back side of Caswell Beach and along the inlet shoreline of Bald Head Island. o Over 86 wave classifications were evaluated based on potential conditions ranging from normal to storm situations. ■ It was asked how would infilling of the borrow area affect wave heights as reflected in the modeling results. Johnny confirmed the modeling depicts results during worst case scenario of dredging the entire footprint and immediate reaction. o A request to evaluate sediment transport change along the oceanfront shoreline was recommended to depict change between existing conditions and preferred alternative. ■ Modeling results depicted a slight increase of 0.2 ft/sec in currents. • Potential monitoring and mitigation requirements were discussed and ongoing efforts by Bald Head Island. It was agreed the Town of Oak Island recognizes the need to evaluate shoreline and borrow area monitoring to evaluate infilling rates and shoreline change. o A recommendation by Bald Head Island is to include an oceanfront shoreline survey on Caswell Beach. o Shoreline sediment transport change rates was recommended to include in the analysis. • A list of data sources input into the Delft3D model was requested. o Johnny confirmed a variety of diverse data sources were included into the model to cover all conditions. • Concern regarding the distance of the borrow area to the placement area was discussed. o It was confirmed most likely a hopper dredge would be used but that use of a pipeline dredge would also be allowed to increase bid competition. • A request to review the Draft Environmental Assessment. o Dawn York indicated the Draft Environmental Assessment was still under development and would be coordinated with the USACE Wilmington District. o It was agreed that Section 408 would be a potential permit authorization needed by the USACE. • Other compatible sources of sand were discussed, including the potential use of Lockwood Folly Inlet. o Johnny Martin explained the difficulty of using Lockwood Folly Inlet due to the significant resources surrounding the inlet, lack of sufficient volume available with current authorizations, need for widening and deepening, state and federal permit process, etc. The inlet will be considered for future projects on Oak Island, in coordination with the County and Holden Beach. • Proposed dune heights were raised as a concern for access to the beach. o It was explained that walkovers would be allowed (as were there pre -storm) to accommodate the built dunes. Dunes will be planted during construction to sustain material. • Borrow area surface sediment toxicology composition was discussed based on concern of Duke Energy outfall pipe. o Additional information is needed to evaluate the potential presence of toxins within the Jay Bird Shoals area. LAW.. TOWN OF OAK ISLAND 2019/2020 RENOURISHMENT PROJECT MEETING 08/07/2019 (2:00 PM) - TOWN OF OAK ISLAND TOWN HALL /NAME �` REPRESENTING PHONE? 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YI.Y\, Y `� n Ot r 4-1 V f vo, $ �I l °1-� 81- y 6z(o rAof� #-},n lcln of .com I 71 may` rA THE TOWN OF OAK ISLAND, NORTH CAROLINA • Field Investigations — Vibracores offshore and upland • Borrow Area — Jay Bird Shoals • Placement — Extent and template • Model Results — Currents & Waves in Delft3D • Schedule — Construction Winter 2019/2020 — Geotechnical vibracoring for sediment compatibility • Jan -Feb 2019: Nearshore work completed for Lockwoods Folly Inlet, Eastern Channel, and AIWW Bend Widener • March 2019: Native Beach Sampling • Feb -April 2019: Offshore work completed for USGS, Central Reach, Jay Bird Shoals, and Exploratory Area • May -June 2019: Multibeam Bathymetry and Sub bottom Surveys for Central Reach and Jay Bird Shoals • Aug -Sept 2019: ODMDS and Frying Pan Shoals geophysical, vibracores to be completed beginning of 2020 • Upland Sites: State and Federal Permission to Access to be completed later 2,220,000 2240,000 2,260,000 2,280,000 2,300.000 2,320,000 2,340,000 jzl l:ngiYLAR..A�-. 1*6'p''' .. Y� . � •r ODD , D O q 2.220.000 2,240,000 2.260.000 2.230.000 2.3011.000 2.320.000 2.340.000 Holden Beach -.i- r Oak Isrand � �, _ .. Proposed Vibracore Locations - 219 Vibracores Total D Proposed Vibracores- Zone 1 (53 Vibracores) • Proposed Vibracores -Zone 2 (108 Vibracores) • Proposed Vibracores - Zone 3 (58 Vibracores) " " t 3 mi Offshore Boundary - N 0 8,000 16,000 32,000 Feet O 2.220,000 2,240,000 2,260,000 2.280.000 2.300.000 2,320,000 2.340.000 =,i nffi illl} f9 Y:r*1'I■11'� OMWI •IIIA-A1 Qrhf pY 5•a +.as1; + Nr�•r•1Mr/w•■r■+w{V11, fFh +ri, ■ r• ■r 'f I:Illy fi , •F L h N +L:11:■ �_•. In•rsarl hww'ywr s.rnrlrr� • I lFy •I.vS�i..•�r■:i•'al...:. yy JJ}J M1� '•' 5 dV■IL��.PF��'T.JrI■yJ II'}*{.]Vill{yoRrhJL !.C4,.i�iF.'IC 4}I�:' ■rl TIkr4 II:: J, %l /f J{ '.i i M IJRI I. II r� L. riis'r,J'• ro.f 1Ra■rn'• �•�..tY L I,' _ k l ' r3c lri v Mltit 'ii•<ii.N,�. ■I. va.r 91■ - I ' '�• T�, ¢ ` I � � Q IjlY F�Julo-llQ a•1 ' IY � �o'.tl`� : J yl r . 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No yy. 5{F, ;I,� r1 „ ft J � •' I � ,: Ih .Ir+,r +a �.. :: 5 'J 1 lJ�; f■y!�'4V C C f � cc Field Investioations ■ ■ OAK kSLANC Mt1LT1 DECADAL MASTER PLAN 2019 -CENTRAL- 18 OAK ISLAND MULTI DECADAL MASTER PLAN 2019 -CE NTRAL-19 6A - 8.0 FEET TOP BOTTOM OAK ISLAND MULTI DECADAL MASTER PLAN 2019 -CENTRAL-18 2.0 - 4.0 FEET TOf� BOTTOM OAK ISLAND MULTI j.,111DECADAL MASTEq PLAN 2019 -CENTRAL-18 8.0 - 10, 0 FEET TOP BOTTOM i OAK fSLANO MULTI DECADAL MASTER PLAID! 2019-CENTRAL-18 4.0 - 6.0 FEET TOP BOTTOM ■ Field Investioations OAK ISLAND MULTI OAK ISLAND MULTI MC;ADAL MA5TEA PLAN DECA- W_ MASTER PLAN 2019-JB-08 2019-JB-08 0.0 - 2.0 FEET 2.0 - 4.0 FEET TOP i3olrTOM TOP BOTTOM OAK ISLAND MULTI OAK ISLAND MULTI DECADAL MASTER PLAN DECADAL MASTER PLAN 2019-Ji3-08 2019-.18-08 6.0 - 8_0 FEET 8.0 - 10.0 FEET TOP BOTTOM `__AIIIIIIM� TOP BOTTOM c Ak 1SLANVD MuLTi OAK ISLAND MULTI DECADAL MASTER PLAN (r-CAr AL MASTER PLAN 2019-JB-08 2019-JB-08 12A - 14.0 FEETAk. 14.0 - T&Q FEET flop BOTTOM TOP BOTTOM x — m ph OAK ISLAND MULTI DECADAL MASTER PLAN 2010-JN�-08 4,0 - 6.0 FEET TOP BOTTOM OAK ISLAND MULP DECADAL MASTER PLAN 2019-JR-nA 10.0 - 12.0 FEET TOP BOTTOM • Jay Bird Shoals — Compatible Volume Estimate • 2,890,000 cy Available • 1,030,000 cy of Material to be removed • 790,500 cy will be placed during 2019/2020 Renourishment Project • Mag Anomaly CG 13 9 Pa :+i+:8 a r Chan ' stern 13 � 1 F �9 a •JB-19 •J13-20 •JB-21 •JB-22 �JB-23 Zone 1ML JBA4 �j •JB-18 •JB-01 •JB-02 •JB-03 I Zone 2 Iso 2 JB-1T JB-05 JB.06 JB•07.� JB 08 ` Zone 3 II JB-09 JB-10 JB-11 JB-12 i 26 JB-16 JB-15 JB-14 JB-13 1 5 Zone Dredge Hecation Volume(cy) Volume Including ft,NAVD88 100ftBuffer c Zone 1 -26.0 859,720 859,720 4 /,one 2 -31.0 923,979 904,273 Zone 3 -27.0 1,274,863 1,127,400 8 Total 3,058,561 2 891 393 R,y Legend Elevation (ft. NAVD88) cf • Jay Bird Shoals Vibracores - -29.51 -28 0 -21.99 --20 r u� — MagAnomaly 27.99--26F7 -19.99--18 QJay Bird Shoals Borrow Area ® g --25.99--24--17.99--1fi x 100ft Ma Buffer Q -23 99 - -22 - -15 99 - -14 N 0 750 1,500 3,000 Feet ..._, _ 2250000 2255000 2260000 2265000 2270000 2275000 2280000 2285000 2290000 2295000 ASTAC WATERWAY (seB a i ovr n �1 R cash S 0 U T H P O - --__ - _ o �•• •' 1` t�Q�%Sn-. TANK 1. �Ont9omery Slough ,Marshl� '- •'IHDP,,RRCAK }' - �SP3RE o7atik a ` _ _ `_i TANK _ E''v'I flso H6s3Yi �` O p...._ p.....0 0..-....0-\ s 2ft NI ht) O + CD + 1 + Q p pi - p TA 47igr�u7 C'7 r O + p- ' - 1 �@! 14•Wk eflt v ,.., �}• � 07 � O i-, O ub 00 O -0. , : Ica"O O O 2 Proposed Placers? 2 Mz ) ry o o �`. + ,&o, q 1 • ..• ... _� Area 300+ 500+ 1"� rr� o _ ` _s_ ' °laj i5rab q k Y , -r 00 cv cn * 16 �� �� 25 fy g •....�... ps r 31 31 33 .325i 4 F1N t 0 ss 29M,. L N© OAK ISLAND ti011A 21,00 _ 28 Pr 7 \\•�... AsO 52 aM 34 31 20 13 PA c+}r: ,....... 8 Obstn — 27 9 Bar Chan 32 Fish Haven 31 Stern 13 �'16 t auth mirB ' . 25 13 34 37 ( °rrOwgr@a MaxOBbsrns33 3t \��v�.. 21 1g 14Rk a 5 s�sriaayst�� 28 E 37 37 35 34 m�I �sOhi PI aC��Te 27 2 `rd0 11 1s0�2s 23ft �?. nfgrQa\ �� �1 Obs1n 38 37 35 34 ! 26 15 7 Frsh Haven 37 29 (auth min 20 h) 20 1 ' 1 2 ` 2/ 1� I F 37 _ 36 32 31 �. 39 36 `3.7_ — 36 37 S Sh \ f \• :+: % I L/> >Qid �o 34 �•.'26; Obstn 19 19� 40 18'. V/ks [[Jwuv cLJJuuu [Lauuu� { LLOJUVU LLI VVVV LLl JVuu LLouUVu LLBJVVV LLJuuuu LL�JVVV Legend Oak Island Monitoring Transects Oak Island Jay Bird Shoals Borrow Area Bald Head Island Jay Bird Shoals Borrow Area �. Proposed Placement Area 2019/2020 0 2,500 5,000 10.000 15,000 Feet Placemen • Model shows dredging the entire 2.89 mcy 17 16 T 15 WN 11 10 692 694 696 698 700 702 704 x coordinate (km) 0 5 10 15 20 25 30 35 40 water depth (ft) 17 ilf 15 14 0 0 13 12 11 10 692 694 696 698 700 702 704 x coordinate —)� 0 5 10 15 20 25 30 35 40 water depth (ft) • Impact to tidal currents — Instantaneous peak flood currents during a Spring tide — Negligible impacts llih6 Existina Conditions .A 17 �1 , d•. 15 m 14 0 13 12 695 696 697 698 699 700 x coordinate (km) 701 702 703 704 IVA Difference 696 698 700 702 704 x coordinate (km) —> 0 1 2 3 4 5 6 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 FloodCurrents_FWOP, magnitude fts) (FloodCurrents_JBOpt3) - (FloodCurrents_FVVOP), magnitude (ftls) • Impact to tidal currents — Residual Currents in a Spring -Neap tidal cycle — Negligible impacts 17 W. 15 T a� m 14 0 0 U 13 M 11 Existing Conditions 695 696 697 698 699 700 701 702 703 704 x coordinate 0 1 2 3 4 5 6 (ResidualCurrents_FWOP) (ft/s), magnitude Difference 17 IM T 15 13 IVA IM 694 696 698 700 702 704 x coordinate -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 ((Residua1Currents_JBOpt3) - (ResidualCurrents_FWOP)) (fUs), magnitude • Offshore Wave Climates • Modeled 86 combinations of wave height & direction for waves coming from between E and W Total in 3 0 W 1.02 2.01 4.98 Significant Wave Height (Annual) Station 41013 - Frying Pan Shoals, NC Period 11-Nov-2003 to 30-Jun-2019 N -I, NW, NE 20% L 10% , , 1 ,r sW ` y _ i SE , i S 1< ■?15 © 12- 15 E39-12 m6-9 E 3 - 6 00-3 Direction FROM is shown Center value indicates calms below 0 ft Total observations 116167, calms 1 About 13.5% of observations missing Percentage of Occurrence 9.97 8,77 6,42 1.53 . 099 - 0.71 . 0.77 . 0.92 0.21 0.15 0.67 0.14 0.49 0.18 0.29 0.35 0.38.0.53�0.35 0.20 0.11 3.15 0.19 0.37 1.31 2.41 1_00 1,46 1.33 1_41 1.96 : 1,39 0.97 - 0.22 - 0,25 - 0,20 0.21 - 0.24 14,93 - 0.67 1.34 2.99 4. 4.33 . 0.80 0,47 : 0.35 0,42 0.55 0.14 0.27 0.51 1.85 2.24 1.88 : 1.84 1.35 : 0.39 0.19 : 0.12 N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Total Total y 3 0 VV Significant Wave Height (Annual) Station 41108 - Wilmington Harbor, NC Period 07-Feb-2013 to 30-Jun-2019 N NW ' NE I ` I L / I \ I \ I toaa \ \ � _ _ _ _ I E i I � I � I l < < 5W SE I _ S Direction FROM is shown Center value indicates calms below 0 ft Total observations 98994, calms 0 About 8.48°%of observations missing Percentage of Occurrence 0.72 - 0-79 - 1 69 6.22 5.65 8.10 111111 17.72 13.87 13.78 ` 4.01 - 1.27 1.04 0.59 0.75 0.67 0.170.21 0.50 025 1.25 1.48 0-91 020 4.57 0,44 0,58 : 1,15 . 4.43 3.36 1-53 5-17 7.90 7.94 8-38 2-17 0.54 0.63 0.37 0.46 0.40 0.27 0.18 0,40 . 1.73 2.22 6.54 ■ 8.39 4.30 4.40 . 1.62 0.63 . 0.34 0.19 0.25 0.24 N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Total • IV • 31 mu- 17 16 15 T E Y 14 m c oo 13 U T 12 11 • Waves between 3 — 6 ft 17 • Mean Hs --= 4.5 ft _ 16 15 • 50% of wave conditions14 m c o 13 12 11 SW 4.5ft incoming wave 17 16 15 Y a 14 o 13 T 12 11 694 696 698 700 702 704 x coordinate (km) -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 (hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft) S 4.5ft incoming wave 7",� �rl �rr�'l�rlrrr�^Irrr����TrVov r4rrr�� ry��frrr rpirTTrrrfTr�r��,�'�%' � f r���r �tq r P7 l �T r%'r��'�;�Trrrrrr�rrrrrr,�r��� rrr r 1 r r r r�T�T� rrrrrr'T��r�rr� r rrrrrrrr���Trrrrrr rr r = �-�r�rrrr � rrr r err � rrT rr,�, T.r 1 rr rT r r rrr r r>r� �rrrrrr -� 694 596 698 700 702 e 704 SE 4.5ft incoming wavC x coordinate (km) trrrrrrrr,n `�� � q� irrrpttPTTtTriT)rrPT tf rT Tf -1.5 1 -0.5 0 0,5 1 1.5 2 irTPrt(r T t� T� T rrp(TTTTrr °TrTrTrTTr j�trTl (hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft) tt Pr r rt pr,Pr 1r Pr Pir1TT rr t 1 tT rr�i RR t1 rtPt PP 9t)t�rtttP Pt rTtT T 1-tt rr St t1' PP P PP.P n� 7 r f nT r1 ttr �', r s' � •, + ' - � � R1 Rr� tttr �tf rf rfr;Pjr tirrtrrr�P .t �� 14 Ca R RR?S tR prPhFrPp PTTPPr1� �f,� t R R t P RPrPtPrrr .P�..,rTprrr� RR Pry Rr 1pPPP prrPrrr,til�ti�,, r rrrrrrr��ffrPffr,S�,,� 0 13 2� i�RtirrPPrrrrrrlP{t P fr r11it t� , rr , rRRrt rtR � rrr rrt r rTr�rr>� �t, �� r a ERR RRr rRR� Rt rrr rrr ( ,t�,, t, r R2r RTt Ttr �t rrr rrr r�{tr, 12��� R T�gTTTR���gfRrrrR�rrfrRrzrrrrr� ,�,t1,t r rt rt q RrrRRRrrRR�rRRR't��t�r't1T1 ��R�iRRR�f��1��1r�q��trrPtT't :I ����� 1��s rr ����T�rr r�rR r rr tP rP rr,. tTR tq, rR1 rr .rPr, _,_., 694 696 698 700 702 704 x coordinate (km) -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 (hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft) • Wave between 6 - 9 ft • Mean Hs -= 7.5 ft • 15% of wave conditions SW 7.5 ft incoming wave a . Fpp1 P A ..+�A lT✓"_ as �N r S 7.5 ft incoming wave 694 696 698 700 702 704 x coordinate (km) -2 -1.5 -1 -0.5 0 0,5 1 1.5 2 (hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft) fi � a? 14 2 j 0 1312 R 4 694 696 698 700 702 704 x coordinate (km) -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 (hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft) trtrt r�r )�rtllorrtvir�r�r jr �1�r(r1� ° tri(t°rrrTr rrr O)r)t p(trtlrT(7 T1T; rrO.rt�)tpt,lt.rt�(P)��rr P n f 694 696 698 700 702 704 x coordinate (km) � -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 (hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft) • Waves>= 18 ft 17 • 21 ft waves seen in 16 15 T Hurricane Matthew m14 • < 0.21 % of wave conditions T13 12 SW 18 ft incoming wave 17 16 rr�rrrP�1 P�PfPP �p f>� f p p1r' �T r�rrrr PrirPrPrrPPPPPP�'rrP r r P> � r>'p P = _ - _ - _ T 15 -- rpPP rrP PPP �;P>r°�' • o � 14 � v o 13 Pr tStr' }tt '' � �,�� T� T11Tr11i�1�P1TPt}1 i 12f 11 694 696 698 700 702 704 x coordinate (km) -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 (hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft) S 21 ft incoming wave 694 696 698 700 702 704 SE 2 1 ft In x coordinate (km) �1r r}}r1r1r r11 r1 2 -1.5 -1 0.5 0 0.5 1 1.5 2}1 1 j }11P1} rrrrrll'11 �1 (hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft) 11t tt}11}t rrr7 pr11r I r tf f irtttl }}t1 r r1 i } 1 } t•}, }'rlrPtt r1��i y 111}i1t1t. rtt}11r�1��'t4tPtStyiPtttP1}ir r,�i,t...�. t 1 1 1 P} r 1} I:1 . P 14 1 1 11 1 t P 1 t} 11 9} r t f-t-'r c q tr1Pttt91tt111PPPrTt114 }}tI1I1P1t'PPt " t t -2 [ �11t1ft1g11tP pP1t}t}}ttjttlTP:'t) o g1)P�1r1q t R11}fp1PTpPPP}}1 a 13 1�1111t11tTgP�tT11)11tt1i1711TTPPPt iPTitPPP�PPPPTtPrr111 4 11g111 � t�)T1P f trr�r911tt1t tr Pr � 1 fP � t T� PP11PP 12itrSglPtljyPPrP)TPPrPrTtPPP ttr r t v)94411gT)t1S�15r1t1rylTP' 1 r tr ,rat 694 696 698 700 702 704 x coordinate (km) � -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 (hsig wave height_JBOpt3) - (hsig wave height_FWOP) (ft) • Modeling— Summary — Modeling showed dredging entire 2.89 mcy — It is expected that some infilling will occur between dredging events — Offshore wave heights in Frying Pan Shoals less than 6 ft account for 80% of wave conditions • Model results showing about 3 inch increase of wave heights mostly east of the site — Offshore wave heights in Frying Pan Shoals between 6 — 9 ft accounting for 15% of wave conditions • Model results showing about 0.5 ft increase of wave heights on both sides of the site — Storm wave conditions >= 18 ft such as Hurricane Matthew • Model results showing no more than 1 ft wave height increase on both sides of the site farther offshore; and less than 0.5 ft wave increase close to the shoreline Schedule .1 11 • August 2019 — CAMA Major Permit and Draft EA Submit • November 2019 — Bid Project • January 2020 — Begin Construction • April 2020 — Finish Construction