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HomeMy WebLinkAbout20061471 Ver 1_Shoreline Stabilization_20060911,. ~~ ODg14? 1 APPUCATION FOR DEPARTMENT OF THE ARMY PERMIT OMB APPROVAL NO. 0710-00 /33 CfR 326/ Expiros December 31 2004 The Public burden for thb coMeetfon of informaton i. eMtlmabd b avarape 10 hours per response, ekhough the mejorfty of epplketiwie should requla 5 hours or lees. This inoludaa the tkrte for nviawing ~etruotione, eearohirq existirq Bete souroaa, gatharinp end nrzirtbirtirp tM data needed, end oornplsting end reviewing thr oolMctlon of Intonnatbn. Send comrrlertts regarding the burden est(ntab or any other aspect of this collaotion of information. (noludirq strggestbrre fw reducing tftie burden, b Deperrtrrtarrt of Deferrse, Weeh' rnpton Headquarters Sarviee Dirwtoraa of Irtfomntion Operation and Reports, 1216 Jefferson Davie Highway, Suhs 1204, Arilgton, VA 22202-4302• and to the Oifke of Management and Budget, Paperwork Reduction Project (0710-00031. Waefrltgtab DC 20603. Reeporrdenb should be aware that notes ro person shall be eub~et b any penalty for ~ ~y other provision of law, faillq to comply whh a collection of intnrrrratbn M h does not display a ourrerttiy valid OMB carrt-ol number. Please DO NOT RETURN your form to ehfrar of those addressee. Completed appNoetion must be errbrrrittad to the District Engineer having jwiediction owr tM location of the proposed activity. PRIVACY ACT STATEMENT AuthorkMs: Rivers and Harbwe Act, Section 10, 33 USC 403; Clean Water Act, 8sction 404, 33 U8C 1344; Maria Protaetion ,Research and Srrctueriss Act, 33 USC 1413, Section 103. PNncipal Purpwe: IMormatbn provided on this form will be aced in svalrat4tg the app0oation for a parmk. Routine Ueee: This ktlFOrmation may be shard with lire Department of Justice and other fadNal, crab. and local gowmrwtt agencies. &tbnti Gott of regweted 'information ie wlutttary, hovwver, if irformation ie not provided the permit application cannel bs avelurtad nor can a permit One set of original drawings or good reproducible coPMe which chow ifre location rnd characbr of the proposed activhy must be atbcltad b this application (see sample drawings and lrtrrrctlorrel and be subnaltad to lira District Ertgirwer frvtng juriadictbn owr lire location of the proposed activity. An appYcatlon that is not oompMbd in fuN wiM he returned. IfTF_Af4 f THAII t rn nc cx r cn nv rue ~nese, "' 1. APPLCATION NO 2. FlELD OFFICE CODE //TEY3 BELnW m 17F C/r r Iqf nv saes ~nw~rn 5. APPLICANT'S NAME 8. AUTHORIZED AGENT'S NAME AND TITLE ren.mnris ar i d NATIONAL PARK SERVICE , ..a. re l B. APPLICANT'S ADDRESS 9. AGENT'S ADDRESS 131 CHARLES STREET HARKERS ISLAND, NC 28531 , 7.. ICANT'S ON NO . W A EA COD 1 A N N CO ' a. Residence a. Residence b. Business 2 5 2- 7 2 8- 2 2 5 0, EXT . 3 014 b. Business 11. STATEMENT OF AttTNnmve•nrw I hereby authorize, to act in my behalf as my agent in the processing of this appHcstion and to furnish, upon request, supplemental information in support of this permit application. APPLICANT'S SIGNATURE GATE NAME LOCATION AND DESCRIPTION OF PROJECT OR ACTIVITY 12. PROJECT NAME OR TITLE lets irriwiaru, National Park Service, Cape Lookout National Seashore, Harkers Island Shore Protection Project 13. NAME OF WATERBOOY. IF KNOWN /~w,~,w.rr.i ~ 14. PROJECT STREET ADDRESS le.op~mw~ Back Sound Cape Lookout National Seashore, Harkers Island 15. LOCATION OF PROJECT Carteret NC COON STATE f 18. OTHER LOCATION DESCRIP7K)NS. !F KNOWN, raerrr~nbnsl See Attached 17. DIRECTIONS TO THE SITE See Attached rt. E:. ~ ~. ~ L~~'S iNET,AM1 r~ 3,1 , Wl `?a ~~ `n:.iTY 0 I ~,,:,~ 1N~, ~ri~FRAiVCH ' OF E !)•41 O LETE. tPloparrent: CE -ORl I 3. DATE RECEIVED +4. DATE APPLICATION COMPLETED 18. Neturs of Activity foescv;~dporecr,r,cwx,tssprevn,~,rl Construction of offshore stone sill along eroding shoreline of National Park Service (NPS) Administrative Site, Cape Lookout National Seashore, Harkers Island; renovation of NPS existing boat basin. See attached Project Description. 19. Project Purpose m«orie. the reRan n pvpo~e w ms prgecY, ~.. w~ntn1criorsl Preservation and protection of facilities at the NPS Administrative Site from effects of an eroding and migrating shoreline; maintenance of existing boat basin and ramp, and adaptation to accommodate future public ferry service to park barrier islands. U8E BLOCKS 20-29 IF DREDGED ANDlOR FILL Me wt 18 TO BE DiSr`~;artA~.3 20. Reason(s1 for Discharge -' Construct offshore stone sill and breakwater at boat basin entrance. See attached. 21. Type(sj of Material Bsinp Disehrped and the AmourK of Esch Tvw in Cubic Yards NC Department of Transportation class 2 riprap, a dense atone up to 24 inches in size, laid over geotextile fabric. Eleven thousand (11,000) cubic yards deposited from barge or land. 22. Surface Area in Acres of Wetlands a Other Waters Filled ra..rrm~ra,,.i 1.82 acres of water filled. 0.05 acres of emergent marsh wetlands filled. 23. la Any Portion of the Work Akeady Complete? Yes ~ No " IF YES. DESCRIBE THE COMPLETED WORK 24. Addresses of Adjoining Roperty Owners, Lessees. Etc., Whose Property Adjoins the Waterbody (lf mon than can be entered here, please attach a supplemental listl. Mr. Andrew W. Fuller, Jr. Mr. William B. Howell, Jr. PO Box 1147 PO Box 12525 New Hern, NC 28563 Raleigh, NC 27605 25. List of Other Certifications o- ApprovsWDenials Received fiom other Federal, Stole or Local Agencies for Wark Described in This Appliestion. AGENCY TYPE APPROVAL' IDENTIFICATION NUMBER DATE APPLIED DATE A PROVEG uA i t: utavitcu •w .,.,~.r :..,.~..a. w.. P .._~•~ •.......~~ .-... ,• .w..ao.ncaa~u w wrnng, ounong en0 nOOC plain permits - - 26. Application is hereby msde for a permit or permits to autliori:e the work described in this application. I certify that the information in this is complete end accurate. I furtfisr certify thst I possess the authority to undertake the wak described heron or am acting as the du Guth agent of appl' ant. ~ ~ Ot? SIGNATURE OF APPLICANT DATE SIGNATURE OF AGENT DATE The appUcation must be signed by the person who desires to undertake the proposed activity (applicant) or it may be signed by a duly suthori:ed agent if the statement in block 11 has been filled out and sued. 18 U.S.C. Section 1001 provides that: Whoever, in any manner within the jurisdiction of any department or agency of the United States knowingly and willfully falsifies, conceals, or covers up any trick, scheme, or disguips a material fact or mskes any faMre, fietitlous or fraudulent statements ar representations or makes or uses any false writing or doeumerK knowing same to contain any false, fictitious or fraudulent statements or entry, shah be fined not mac than ! 10,000 or imprisoned not more than flue years ar both. a NATIONAL PARK SERVICE CAPE LOOKOUT NATIONAL SEASHORE HARKERS ISLAND SHORE PROTECTION PROJECT DESCRIPTION AND ALTERNATIVES ANALYSIS August 2006 I. PURPOSE AND NEED FOR ACTION Description of Project Area. The National Park Service (NPS), Cape Lookout National Seashore (CLNS), Park Headquarters is located at the southeastern end of Harkers Island, Carteret County, North Carolina at an area identified as Shell Point. The location of the project site is along the shoreline of the NPS/CLNS Park Headquarters property. For illustration of the project location, refer to Figure 1., Location Map; Figure 2., Site Location Map; and Figure 3., Project Location Map. o= Fi, A ° o C 23 _ ~ ~ n canbP YlaMP Anq..t~ ~3 diililcc ' Chat~.•m Wat`a' Prtt ~ r NTfh Cumbrr MPndPfxM Union hn.,nn nd Itnkc I.vM °~,~ rr~nvwama ~,,, SCntland ~, Btaae.r :'Varth Gurolinu PP"'k" Cdtuntws MdMYPI Location Map Area f~~ ~~~~~~~ a ~1! SEP 1 y 200G JENft - Wr~TE~t C2'u~ALiTY WETLANDS AND STORMWP,TER $RANCH Figure 1. Location Map 4, _ i ~' r' ~t I' _ N +~. I z ~ . ~, ~ NnU sicn .~ ~ « ~ewt 41wM IJ ~~ G' ~ LA Wy. ~. ~y.~ •~ ~ M.~ Irw+e~ ~4 ~ ' W..~ 4 v~ it 'J -_ ~.SM1aeu _ ~.,,_ `~4RWV •`"~ y \ YY iw 1+. Y. .4 J /(r ~~ hMnhall6Kg S` t ` q r. 1 ~ \ l t ~ l M . ca+b.a ouay m l 5aann. ~ ~-~- a.rn~ l . ~ ,• , ~ ~.,., ..~. ~. ~ Mh ~~ r.i Site Lvcativrr •i . G® ~S ': -.~~.'a.n~.aaw • ~ klEfOlI *' • ~. .fa~l4oko~rtlJglrtlppiM. [ ~HA~rt~"' nwrfwsaa7 .1 u~so awanrtc3wn.ra..rn..~awi1V y 'Y A r _ _ ~..~ E•y _ .Y i ~P)f ~- AS a.wa~r u.asa~ra ~aokov r CMY M Figure 2. Site Location Map i ~ n ~~ 1 ~ ~ _ ._ WEST M~UTIf 9AY' :,F~r ~~ ~ ,,, A[ERSR/OGE .,.. fRGL'Y ti~ k .F '' u ~ ..~ ~~ } ~ ~ ~ n +i ~ ~ - y.Flw'7 CM C1R ~ Pro 'ect ~ w x ~~~~ Location HARKERS' ISLAND museum Figure 3. Project Location Map Description of Proposed Action. The shoreline of the NPS/CLNS Park Headquarters property has been experiencing severe and persistent erosion for many years, primarily due to the effects of wave action with occasional inundation at high tide and, to a lesser extent, wake from boat traffic. See Figure 4. Changes in NPS/CLNS Shoreline. As a result, there has been significant and continuing loss of high ground property and damage to structures along the shoreline. The rate of erosion also presents an imminent threat to structures and other park facilities in the vicinity of the shoreline. The goal of the proposed action is to effectively and economically stabilize the shoreline to prevent further erosion, while maintaining as natural a shoreline appearance as possible. Figure 4. Changes in NPS/CLNS Shoreline II. ALTERNATIVES A. Alternatives Considered but Dismissed. A range of alternatives were considered for the purpose of protecting the NPS Harkers Island shoreline. Alternatives considered but dismissed, since they did not realistically satisfy the parameters for purpose and need, include the following: Inner Offshore Sill Without Upland Grading: excess exposure and minimal size would limit effectiveness; substantial adverse effects to existing emergent shoreline marsh. Shoreline Grading and Planting Only: very poor expected resistance to wave action and continued erosion. Grading and Planting with Mat Reinforcement: poor expected resistance to wave action and continued erosion. Upland Riprap: would not maintain a natural shoreline; high maintenance. Seawall: would not maintain a natural shoreline; high maintenance. Install Riprap at Base of Outer Bulkheads: Adverse effects to submerged aquatic vegetation; limited benefit; difficulty in meeting NC Coastal Zone consistency requirements. Geotube Placement for Shoreline Protection: rapid deterioration due to degradation, damage, and vandalism. B. Considered Alternatives. The three considered alternatives included the following: Alternative A, Offshore Sill, Bulkhead and Boat Ramp Repair AGENCY PREFERRED ALTERNATIVE Offshore Sill. This alternative would involve the construction of an offshore stone sill of trapezoidal cross-section. The sill would be located in Reaches 1 and 3, along a total of approximately 3000 linear feet of shoreline. Sill construction would be approximately 40 percent porous throughout, and alignment openings would be provided to further encourage movement of aquatic organisms to and from waters shoreward of the sill. The openings would be constructed in an overlapping configuration to avoid compromising sill integrity and shoreline protection. The sill footprint would cover approximately 1.21 acres of bottom in Reach 1 waters and 0.57 acre in Reach 3. See Preferred Alternative Plan 3.2.1. The stone is projected to be North Carolina Department of Transportation (NCDOT) class 2 riprap, a dense stone up to 24 inches in size, laid over geotextile fabric. The sill footprint would lie one to two feet below mean sea level in water shoreward of virtually all submerged aquatic vegetation (SAV) beds, and waterward of existing emergent marsh vegetation to the extent possible. Direct impacts to existing emergent marsh vegetation would be less than 0.05 acre. Its position, approximately 30 to 60 feet offshore, would allow development of additional marsh vegetation in viable portions of the shallows between sill and shoreline. Marshgrass would be planted along the water's edge in these reaches, and SAV in waters between the sill and shoreline, to the extent feasible. The top of the sill would be positioned approximately one foot above ordinary high water, and openings would be incorporated for circulation to maintain water quality, for cross movement of aquatic organisms, and at the existing beach in Reach 3, for boat and beach access. Bulkhead and Boat Ramp Repair. This alternative would include repair and replacement of existing bulkheads in Reach 2. Repair would include excavation behind portions of the existing bulkhead to inspect and repair any holes, placement of a stone filter layer and filter fabric, and construction of concrete splash protection along the top of the wall. This alternative would also involve replacement of portions of existing bulkheads which are failing, as well as other selected portions not failing, but where the new system is desired. The replacement structure would be a vinyl sheet pile system placed just outside the existing bulkheads. Appropriate founding of this system would be determined based on a new subsurface investigation. The existing boat ramp, which is in disrepair, would also be replaced with a new concrete ramp about 20' wide. The adjacent bulkhead would be extended since the new ramp would be narrower than the existing one. This alternative would also include construction of a breakwater extension at the outer opening of the basin entrance. This would allow the entrance channel to be widened by removing the high-ground peninsula adjacent to the channel. The breakwater extension would begin at the south corner of the boat basin entrance. It would extend 50 feet across open water toward the opposite corner of the entrance, and would be constructed in a manner similar to the stone sill. It would extend to a height of 3 feet above ordinary high water, and its footprint would cover approximately 1800 square feet of bottom in open waters. See Preferred Alternative Plan 3.2.1. .:,, a~ ~ ~~ 9 ~ ~ ~_ 3 ~ ~ ~ ~ ~ ~~ ~~ y ~. ~~ f i i ~ ~I. i . ~~ - - _ e ~ i /;' ~~ ~ ~~ ~ ~ o~ ~ ~ ~~ 1 } ..~ .+.._~ +~ 1 ~ `~ . 1 ,,;~;~ . ~ i i~;~~ ~ ,; ;~ ~~~ `~+ i ~.~ T ~{ s.w , i i s i '? ~ - ~~~ ~ sal 14 ~ ~ ~ r. `~~ ~ ~. ~ ` [-' `~ '} r i ~~ s ~' -' ..w f ~ +-,._ I ;~ ~ / ~,. £ ~' '¢ M~ f _ X ~~~ --t 9 ^T1'_- 7 '~ ~ sB , ~{p ~ f f ^~ .~ ~, .k' C ~ ~6 .,,, ~» s `~'z a~n 1 yT ~ Jy ~; _ _ :~ -;~~ ~ ~i i ~ - ~ 3=' +^ n- ., .~ ,, , . :a,., . . a ~ - tt Preferred Alternative Phn 3.2.1 Alternative B, Grading and Planting with Concrete Mat, Bulkhead and Boat Ramp Repair. Grading and Planting with Concrete Mat. This alternative would involve the regrading of the existing shoreline fora 3:1 slope gradient from high ground into the water. The new slope would be planted with a graded mix of shoreline vegetation within an articulating concrete mat, from high ground to -2.0 feet, below mean sea level. Vegetation species would be varied, mixed, and merged for suitable growth along the entire slope to the bottom intercept. The concrete mat would be composed of perforated concrete units approximately 12" square and 6 to 8" thick, joined by a matrix of steel cables, and laid over a bed of gravel. There is concern that, even with the concrete mat acting as ballast, this alternative would either fail to reliably stabilize the shoreline, or would require excessive maintenance. The existing shoreline has been eroded even in areas which were covered with concrete rubble. The vegetated slope, even when reinforced with concrete matting, may prove inadequate, especially during major storm events. This alternative's effectiveness in shoreline stabilization would be expected to be minor. Consistent maintenance would be required to maintain stability, involving repair and replacement of the concrete mat and its subgrade, and replanting of vegetation, particularly after major storm events. Bulkhead and Boat Ramp Repair. This portion of work under Alternative B would be the same as Alternative A. No Action Alternative. The No Action Alternative would involve no change to the current status of shoreline management. There would be no construction of new shoreline protection measures- only continuing repair and maintenance of existing seawalls, bulkheads, and structures. Erosion of high ground along Reaches 1 and 3 of the shoreline would be expected to continue, and high ground acreage would continue to decrease, under the No Action alternative. Continuing erosion would eventually threaten structures along these reaches, including roads, parking areas, trails, and buildings located in the vicinity of the shoreline. This alternative would not satisfy the goals of attenuating erosion, stabilizing the shoreline, and protecting existing structures. With no action, the shoreline would remain unstable and additional high ground acreage would be lost to erosion. This future loss would not be recoverable, and would, in addition to the reduction of land acreage, diminish the extent of native forest and shoreline vegetation along these reaches. With no upgrading of existing bulkheads along Reach 2, including the boat basin, serious deterioration of the bulkheads could be expected to continue. Portions of bulkhead exposed to the higher wave energy of the sound could be expected to deteriorate more quickly, as indicated by historical effects and current bulkhead conditions. Continued deterioration would result in failure of bulkhead structures, allowing high ground soil migration into the channel and basin. This would both impede the use of the basin for its basic purposes, essential to NPS/CLNS staff activity, and allow a potential loss of high ground acreages, portions of the state road, and turnaround on the end of the island, within and near Reach 2. III. AFFECTED ENVIRONMENT Alternative A, the Agency Preferred Alternative, is also the environmentally preferred alternative. This alternative would result in major positive impact to shoreline stability, and minor-to-moderate positive impacts to high-ground vegetation, wetlands, fish and wildlife, soils/geology, land use, transportation, economics, natural shoreline, availability, and natural resources. There would be no net impact to recreation boat access. See Environmental Assessment for National Park Service Ca e Lookout National Seashore Harkers Island Shore Protection Pro'ect Carteret Coun North Carolina. IV. CONSTRUCTION Construction of the offshore stone sill along the wooded eastern shoreline would be accomplished by transporting the stone in by barge and placing from offshore by bucket. Boat basin rehabilitation in Reach 2, and sill construction along the southern shoreline in Reach 3, would be accomplished from land, since these shorelines are open and accessible from roadways. Timing of construction would be dependent upon weather for the sills and outer bulkhead rehabilitation. Construction is expected to begin April 1, 2007 and conclude by October 1, 2007.