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HomeMy WebLinkAbout1000-111.-10-14 OFFICE LOCATION: Q .S� MAILING ADDRESS: Town Hall Annex P.O.Sox 1179 54375 State Route 25 Southold, NY 11971 (cor. Main Rd. &Youngs Ave.) ces Sn ., Telephone: 631 765-1938 Southold, NY 11971 �., ya, LOCAL WATERFRONT REVITALIZATION PROGRAM TOWN OF SOUTHOLD To: Glenn Goldsmith, President Town of Southold Board of Trustees From: Mark Terry, AICP LWRP Coordinator Date: October 15, 2024 Re: LWRP Coastal Consistency Review for VANSTON BEAR, LLC SCTM# 1000-111-10-14 VANSTON BEAR, LLC requests a Wetland Permit to remove an 85' section of existing bulkhead and jetty along southern side of inlet and reconstruct in alignment with existing bulkhead using PVC sheathing; for a Ten (10) Year Maintenance Permit to dredge approximately 500 cubic yards of bottom material at mouth of dug boat basin; remove approximately 1,600 cubic yards of bottom material to create a deposition basin; place all dredged material on two upland areas and retain the material with staked hay bales; dried materials to be spread out above the Mean High Water line. Located: 5250 Vanston Road, Cutchogue. SCTM# 1000-111-10-14 The proposed action has been reviewed to Chapter 268, Waterfront Consistency Review of the Town of Southold Town Code and the Local Waterfront Revitalization Program (LWRP) Policy Standards. Based upon the information provided on the LWRP Consistency Assessment Form submitted to this department, as well as the records available to me, it is my recommendation that the action is CONSISTENT with the LWRP, provided that: 1. Seasonal restrictions apply to operations prohibiting dredging work between January 1 through October 1 to protect protected species that could be using the area (NYSDEC Environmental Mapper). This area is within the NYS DEC Cutchogue Harbor beach Piping Plover nesting area. 2. Turbidity controls are required in accordance with Chapter 275. Pursuant to Chapter 268, the Board of Trustees shall consider this recommendation in preparing its written determination regarding the consistency of the proposed action. Cc: Honorable Lori Hulse, Attorney Town of Southold RECEIVED O C T 0 4 2024 LWRP CONSISTENCY ASSESSMENT FORM Southo d Town A. INSTRUCTIONS Planning Board 1. All applicants for permits* including Town of Southold agencies, shall complete this CCAF for proposed actions that are subject to the Town of Southold Waterfront Consistency Review Law. This assessment is intended to supplement other information used by a Town of Southold agency in making a determination of consistency. *Except minor exempt actions including Building Permits and other ministerial permits not located within the Coastal Erosion Hazard Area. 2. Before answering the questions in Section C, the preparer of this form should review the exempt minor action list, policies and explanations of each policy contained in the Town of Southold Local Waterfront Revitalization'Program. A proposed action will be evaluated as to its significant beneficial and adverse effects u on the coastal area(which includes all of Southold Town). 3. If any question in Section C on this form is answered "yes" or "no", then the proposed action will affect the achievement of the LWRP policy standards and conditions contained in the consistency review law. Thus, each answer must be explained in detail, listing both supporting and non- supporting facts. If an action cannot be certified as consistent with the LWRP policy standards and conditions,it shall not be undertaken. A copy of the LWRP is available in the following places: online at the Town of Southold's website (southoldtown.northfork.net), the Board of Trustees Office, the Planning Department, all local libraries and the Town Clerk's office. B. DESCRIPTION OF SITE AND PROPOSED ACTION SCTM# 111 _10 _14 PROJECT NAME Vanston Bear Jetty& Dredging The Application has been submitted to (check appropriate response): Town Board ❑ Planning Board❑ Building Dept. ❑ Board of Trustees 1. Category of Town of Southold agency action(check appropriate response): (a) Action undertaken directly by Town agency(e.g. capital ❑ construction,planning activity, agency regulation, land transaction) ❑ (b) Financial assistance(e.g. grant, loan,subsidy) (c) Permit, approval, license,certification: Nature and extent of action: Dredge approx. 500 cy bottom material at mouth of dug boat basin. Remove approx. 1,600 cy bottom material to create deposition basin. Place all dredged/removed material on 2 upland areas and retain with staked hay bales.Remove 85'section of existing bulkhead and construct new 85 ft section of bulkhead in alignment with existing bulkhead. Location of action: 5250 Vanston Road, Cutchogue Site acreage:_12 ac. Present land use: Single Family Residence__ Present zoning classification: R-40 2. If an application for the proposed action has been filed with the Town of Southold agency, the following information shall be provided: (a) Name of applicant: Vanston Bear LLC — (b) Mailing address: 118 Amity Street Brooklyn NY 11202 (c) Telephone number: 917 892 6946 Will the action be directly undertaken,require funding,or approval by a state or federal agency? Yes ❑✓ No❑ If yes, which state or federal agency? NYSDEC, USACOE C. Evaluate the project to the following policies by analyzing how the project will further support or not support the policies. Provide all proposed Best Management Practices that will further each policy. Incomplete answers will require that the form be returned for completion. DEVELOPED COAST POLICY Policy 1. Foster a pattern of development in the Town of Southold that enhances community character, preserves open space, makes efficient use of infrastructure, makes beneficial use of a coastal location, and minimizes adverse effects of development. See LWRP Section III—Policies; Page 2 for evaluation criteria. Yes ❑ No 0 Not Applicable Attach additional sheets if necessary Policy 2. Protect and preserve historic and archaeological resources of the Town of Southold. See LWRP Section III—Policies Pages 3 through 6 for evaluation criteria ❑ Yes ❑ No Z Not Applicable Attach additional sheets if necessary Policy 3. Enhance visual quality and protect scenic resources throughout the Town of Southold. See LWRP Section III—Policies Pages 6 through 7 for evaluation criteria ❑ Yes ❑ No ❑✓ Not Applicable Attach additional sheets if necessary NATURAL COAST POLICIES Policy 4. Minimize loss of life, structures, and natural resources from flooding and erosion. See LWRP Section III—Policies Pages 8 through 16 for evaluation criteria ❑✓ Yes ❑ No ❑ Not Applicable The project will(1)preserve the integrity of a water dependant structure,(2)reduce the risk if loss of life which may result from navigation across the shoaled entrance to the existing boat basin,and(3)enhance the protective capabilities of the nearby beaches by placing clean,native,dredged material that is the same size or slightly larger than the grain size of the recipients beaches,to enhance the natural protection of beaches. Attach additional sheets if necessary J Policy 5. Protect and improve water quality and supply in the Town of Southold. See LWRP Section III — Policies Pages 16 through 21 for evaluation criteria ❑✓ Yes ❑ No ❑Not Applicable the proposed realignment of the existing jetty,along with the proposed dredging at the entrance to the boat basin,will serve to improve the qualtiy of the surface water in the boat basin by allowing increase water volume to enter and exit the basin.The enhanced flushing of the boat basin will reduce the water temperature in the basin,increase the level of dissolved oxygen and reduce the potential for growth of toxic algae which can occur in waterways that are either stagnant or have low rates of water exchange with the waterbodies to which they are connected. Attach additional sheets if necessary Policy 6. Protect and restore the quality and function of the Town of Southold ecosystems including Significant Coastal Fish and Wildlife Habitats and wetlands. See LWRP Section III—Policies; Pages 22 through 32 for evaluation criteria. 7 Yes ❑No ❑ Not Applicable The proposed project will have no adverse environmental impact on the local Bay habitat.Water quality and aquatic habitat in the area of the existing boat basin and Cutchogue Harbor will be improved through increased tidal water exchange (flushing), increased levels of dissolved oxygen, and reduced growth of harmful algae. No vegetated wetlands will impacted by the proposed project. Attach additional sheets if necessary Policy 7. Protect and improve air quality in the Town of Southold. See LWRP Section III — Policies Pages 32 through 34 for evaluation criteria. ❑ Yes ❑No Not Applicable Attach additional sheets if necessary Policy 8. Minimize environmental degradation in Town of Southold from solid waste and hazardous substances and wastes. See LWRP Section III—Policies; Pages 34 through 38 for evaluation criteria. ❑ Yes ❑ No W1 Not Applicable PUBLIC COAST POLICIES Policy 9. Provide for public access to, and recreational use of, coastal waters, public lands, and public resources of the Town of Southold. See LWRP Section III—Policies; Pages 38 through 46 for evaluation criteria. Ye❑ No ✓❑ Not Applicable Attach additional sheets if necessary WORKING COAST POLICIES Policy 10. Protect Southold's water-dependent uses and promote siting of new water-dependent uses in suitable locations. See LWRP Section III—Policies; Pages 47 through 56 for evaluation criteria. ❑Yes ❑ No ❑✓ Not Applicable Attach additional sheets if necessary Policy 11. Promote sustainable use of laving marine resources in Long Island Sound, the Peconic Estuary and Town waters. See LWRP Section III—Policies; Pages 57 through 62 for evaluation criteria. ❑Yes ❑ No❑✓ Not Applicable Attach additional sheets if necessary Policy 12. Protect agricultural lands in the Town of Southold. See LWRP Section III — Policies; Pages 62 through 65 for evaluation criteria. ❑ Yes ❑ No❑✓ Not Applicable Attach additional sheets if necessary Policy 13. Promote appropriate use and development of energy and mineral resources. See LWRP Section III—Policies; Pages 65 through 68 for evaluation criteria. ❑Yes ❑ No FV/1 Not Applicable PREPARED.RY Andrew Baird / First Coastal Corb TITLE Agent DATE 07-23-24 =aa 4 � a ° s p9'.°�e: "�d .. :+N� '�� ,av♦,s. x W yo a ♦ 5 !, lirjre t J toe Y 9 n, a w 1. .1 0.0 S ��qJ � l t� »n°Mr. - 1 ♦l -' p 2+ 5 � °. - � 5� ,�5+�l M m e-. r ° vlE4T Po. � - 1u -}�\ 1 a � t �\5 E�r•�� » .w pT a.. :6)wo P •ry " ; «;l aJY," by -11 21 q l 6 � L .. f. •�a ng " 1 fG ~� P �Q N7 .is St '61r �.,. . P � �\• 54 No 4 12 { ' ,a. 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BOX 366 5-7.S 3 ,s3 AQUEBOGUE, NY- 11.931_—_ s2 2/24/2023 9:18:02AM 0:W5ers\Bo1o\Document5\00 5LM from 201-715250 Vnstn combine 2022b.pro �S3 80 ft CROSS SECTION C-Ct �7& 10 SCALE 1'=20' 00 0 I_ SHW Z O--�MLW U EXISTING MATERIAL PROPOSED 3B -- 32 � �a HpT# 7 _jLli 10 BLLIOTTOM GRADE TOEM E BOTTOM GRADE, '3 :--.- - 'Y a��p aG�O h Jbo� �Op-7 10 20 1 30 40 50 60:.1 i +70 i I i 80 _ G h'` Wier e Pr �\ U11 g 3 e S gssocpe"I`, cl 110 ft — �7 ��L fjltlww,w 3^u -eEQt_j°In'` 'y( ✓7R �a +inn - 1 CROSS SECTION B-BI `�. � s �` .• � SCALE V=20' _ ♦ h� SHW �\ .� "� :`O�t Q y ? �` �+ t s? ryx '`5250 � •s -ak Y — — \ ; h 4 J s6 O Q 0 MLW �. 3 o s Sd �' Noss 0�SI z T 20 49 --- Q g s C!//OV A°b Z _ �4�s \,, s ? s�2-------- _ 9 old so °Od _ 3 J q ° +�, Y s Ss---blkd: s9 9Ge 1+ � 1 Jf�,� Q-10- PROPOSED PROPOSED IXISTING .3 \� ��� ' O m �s Ue'u+H a� ss , w BOTTOM GRADE -MATERIAL TO BE BOTTOM 8 h J EL-4.0 FT �, p r w _ r DREDGED GRADE J are'$ o ��� JS, sg �e HWI ? o I _ \4't' V�t a8e` 1r� \gs '•.p ` �� Y '�3{{{ Remov 4J S,Q '> $ "�7Tk{jc�3> S3 b 10 20 30 40 50 70 80 90 0 100 110 `4 ,� �j ray V �p s s a s s�? c Y. 85 t 4> 3s REMOVE EXISTING 4,) \4q �rned �. �`.• m ;�1 td es BULKHEAD[85 L.F']t) ! 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Box 1212, 4 Arthur Street Update with January 2023surve 04/07/2023 6�t�� Westhampton Beach, N.Y. 11978 VANSTON BEAR LLCFor Permits Only (631)288-2271 ; fax (631)288-8949 5250 VANSTON ROAD Drawing No SCALE CUTCHOGUE, NY Do Engineering r �nci�r les or Data used Date: Drawn 09/16/22 By Sheet AHB 1" = 60' e No 1 OF 1 SCTM# 1000-111-10-14 P 06-02-2022 VIEW EAST: PORTION OF BULKHEAD TO BE RE-ALIGNED. VIEW EAST: PORTION OF BULKHEAD TO BE RE-ALIGNED. 06-02-2022 _ _- 06-02-2022 � : .� ..� .�" % � �' �� - - -.+_ -�� �•-�� '` �. � _,,=yam_ VIEW WEST: EXISTING SHOALED ENTRANCE TO DUG BASIN. VIEW NORTH: EXISTING SHOALED ENTRANCE TO DUG BASIN. REVISIONSFIRST P.O. Box 1212, 4 Arthur Street coaWesthampton�t� Beach, N.Y 11978 VANSTON BEAR LLC (631)288-2271 -, fax (631)288-8949 5250 VANSTON ROAD Drawing No Photogrpahs - A SALE CUTCHOUGE, NY Date 09/16/22 1 Di awn By AHB �Lc, 1 OF 1 SCTM# 1000-111 -10-14 06-02-2022 11-2 5-22 0221 VIEW EAST: EXISTING SOUTHERLY DEPOSITION AREA. : VIEW NORTH- LOCATION OF SOUTHERLY DEPOSITION BASIN 09-01-2020 01-25-202ir « .:. - VIEW EAST: EXISTING NORTHERLY DEPOSITION AREA - VIEW SOUTH: LOCATION OF SOUTHERLY DEPOSITION_ BASIN. REVISIONS DAT FIRST P.O. Box 1212, 4 Arthur Street coat�� Westhampton Beach, N.Y. 11978 VANSTON BEAR LLC (631)288-2271 -, fax (631)288-8949 5250 VANSTON ROAD Drawing No Photogrpahs - B F E CUTCHOUGE, NY Date 09/16/22 1 Drawn By. AHB Sheet No 1 OF 1 SCTM# 1000-111 -10-14 Jetty Realignment and Dredging at 5250 Vanston Road, Cutchogue, NY 11935 SCTM 1000-111 -10-14 - Peconic Bay tip y oo Deposition ite , s• Expand Dredging ' Area =--align Jet:; " .d- Dredge Deposition - Basin Spoil Deposition Prepared by: First Coastal Corp. 4 Arthur Street, PO Box 1212, Westhampton Beach, NY 11978 http://firstcoastal.com/ 1 631-288-2271 April 2023 FIRST Coa;ttl- Jetty Realignment and Dredging 5250 Vanston Road, Cutchogue, NY 11935 SCTM 1000-111-10-14 - Peconic Bay April 7, 2023 Table of Contents Executive Summary 1. Existing Conditions / Site Overview 2. Sediment Budget & Alternatives 3. Deposition Basin & Sand Bypassing Design 4. Monitoring & Adaptive Management Plan 5. Conclusion References Appendix A - Current NYSDEC Permit 1-4738-00444/00018-20 Appendix B — Deposition Basin NYSDEC Permits 1-4738-00444/0006-8 and 15-17 Appendix C — Historic NYSDEC permits. Appendix D - LIAL Grain Size and Total Organic Carbon analysis Location Map for Vanston Bear souir � � c N RD,'--u' ROGUE,NY,11933 room to ••• y Riverhead ► Page 2 of 20 Executive Summary Vanston Bear LLC (The applicant) is requesting a permit to 1. Remove the existing 85-foot-long existing south timber jetty. 2. Construct a new 85-foot-long jetty aligned with the existing bulkhead to the east creating a new navigation channel 70 feet wide. 3. Dredge 500 cubic yards the navigation channel between the re-aligned jetties and bypass the sand around the existing boat basin channel to an approved deposition location north of the channel. 4. Dredge 1,600 cubic yards from a deposition basin south of the re-aligned jetty to contain 2+ years of the anticipated littoral transport and bypass that sand around the existing boat basin channel to an approved deposition location south of the channel. 5. Monitoring and adaptive management plan to confirm dredging and bypassing rates and confirm project function. The applicant provides the following justification for the permit modification: A. The proposed dredging is completely consistent with previously issued department decisions extending from 1991 to the present, as described in detail below. B. The seaward end of the boat basin channel suffers from complete shoaling that precludes navigation between the boat basin and Peconic Bay within months of dredging. C. The existing NYSDEC permit (1-4738-00444/00020) allows up to 1,400 cubic yards of dredging within the channel and deposition on the upland. D. The current dredging window that closes on December 31 of every year means that the channel is completely shoaled, and navigation precluded before the normal boating season in May. E. Sand currently deposited in the channel, updrift of the jetty and offshore is prevented from moving naturally along the beach to the north causing erosion of that shoreline. Consequently, the north shoreline has retreated substantially since 1962. F. Sand bypassing is an accepted method of providing navigation and restoring natural sand flow, which will help restore the shoreline north of the channel. G. The current channel configuration (width, depth and length) at the seaward end of the jetties defining the channel does not provide sufficient capacity to contain this annual sand deposition and also allow navigation. Jetty Realignment and Dredging 5250 Vanston Road, Cutchogue, NY 11935 SCTM 1000-111-10-14-Peconic Bay April 7, 2023 H. The NYSDEC has previously issued a permit to dredge 1,150 cubic yards to create a deposition basin at this site in 1996 and 2004 and to use the material for beach restoration (1-4738-00444/00006-8 and 15-17). I. The sediment to be dredged is greater than 90% sand and less than 5% Total Organic Carbon and thus meets the NYSDEC standard for onsite sediment disposal. I Alternatives to remedy this situation include: a. Expand the navigation channel by realigning the south jetty, dredge the expanded channel, establish a deposition basin south of the south jetty and bypass all of the dredged sand to the north shoreline in an approved location. b. Dredging just prior to the summer boating season in May of every year, which would be within the currently closed dredging window. c. Channel abandonment. K. The recommended alternative is "a" above. a. Expand the navigation channel by realigning the south jetty, dredge the expanded channel, establish a deposition basin south of the south jetty and bypass all of the dredged sand to the north shoreline to an approved location. b. Monitoring and adaptive management plan to confirm dredging and bypassing rates and confirm project function. L. The proposed activity will produce the following environmental benefits: a. Minimize environmental disturbance by reducing the frequency of future maintenance dredging and deposition. b. Provide enhanced navigation. c. Restore the natural flow of sand to the north nourishing that shoreline. d. Enhance endangered shorebird habitat to the north by stabilizing the shoreline. e. Enhance coastal resilience to the northern beach that is currently compromised by erosion. f. Be consistent with previous permits issued by the NYSDEC at this site. Jetty Realignment and Dredging 5250 Vanston Road, Cutchogue, NY 11935 SCTM 1000-111-10-14 - Peconic Bay April 7, 2023 1. Existing Conditions / Site Overview The subject site is a boat basin and channel defined by bulkheading and two timber jetties located in the Hamlet of Cutchogue in the Town of Southold, NY. The boat basin and jetties were established and maintained under several NYSDEC, USACE and Town of Southold permits. The width of the channel is approximately 30 feet at its narrowest point. See Appendix A for a list of permits. y_ 5250 Vanston Road, Cutchogue, NY 11935 Downdrift (north)jetty 0 '... r�a. i'V4 y Updrift (south)jetty 41 l u 11 h lin f S oa g o the boat basin channel mouth Figure 1: Site plan of 5250 Vanston Road, Cutchogue, NY. Aerial photo on 3/13/2021 from Nearmap@. Since 2001 the updrift (south)jetty of the boat basin channel has been at sediment carrying capacity, i.e., the point at which impoundment of naturally accreting sediment reaches its limit and bypassing occurs to the adjacent, downdrift beach (Kraus, et al. 2016) (USACOE Engineer Manual 1110-2-1100, 2003). Sand has been spilling around the updrift (south)jetty, into the boat basin channel mouth, where it cannot escape through natural forces alone due to a small tidal prism (tidal prism is the total amount of water that flows into a harbor/basin or out again with movement of the tide, excluding any freshwater flow (USACOE Engineer Manual 1110- 2-1100, 2003) and weak prevailing currents. Currently, the shoaling of the channel mouth precludes navigation to and from the boat basin and Peconic Bay within months of the dredging. Water quality in the boat basin is also adversely impacted due to the lack of flushing and natural sand flow to the north (updrift) beach is also interrupted resulting in erosion of the northern shoreline. Jetty Realignment and Dredging 5250 Vanston Road, Cutchogue, NY 11935 SCTM 1000-111-10-14- Peconic Bay April 7, 2023 The applicant proposes to remedy this situation by: 1. Relocate and reconstruct the existing south existing timber jetty. 2. Dredge the navigation channel between the re-aligned jetties with sand bypassing around the existing boat basin channel to an approved deposition location north of the channel. 3. Dredge a deposition basin south of the re-aligned south jetty to contain 2+ years of the anticipated littoral transport. 4. Sand bypassing of the dredged sand around the existing boat basin channel to an approved deposition location north of the channel. 5. Monitoring and adaptive management plan to confirm dredging and bypassing rates and confirm project function. The existing permits (see Appendix A for copies of the current permits and a list of past permits) allow for annual dredging of the channel mouth. Unfortunately, experience at the site reveals that the seaward end of the boat channel fills in with sand more rapidly and thus the channel is not performing as intended. Aerial photographic analysis and direct observations at the site over the last two dredging seasons reveal that navigation is precluded within approximately 6 months of dredging. 2019/2020 Dredging Season The dredging window restrictions preclude dredging between January 1 and October 1 of any year thus, dredging is only allowed between October 1st and December 31st of any year. Dredging was completed prior to the December 31, 2019, cutoff date. The dredged channel and dredge material placement are clearly visible in the February 2020 aerial (Figure 4) However, by September 2020 (seven months) the shoal had already built across the mouth of the channel precluding navigation (Figure 5). This shoal can also be seen in the ground photos taken at low tide by First Coastal in September 2020 showing the shoal emergent at low tide. (Figure 6). By March of 2021, the shoal was emergent at high tide (Figure 7). Thus, within approximately seven months of dredging the channel was unusable and within one year of the dredging, the shoal had almost completely stopped tidal exchange between the boat basin and Peconic Bay. Jetty Realignment and Dredging 5250 Vanston Road, Cutchogue, NY 11935 SCTM 1000-111-10-14- Peconic Bay A ril 7, 2023 F ... , Dredge Material Placement 4 ' t is Channel Dredging complete �= l Figure 4- February 21, 2020, aerial of subject site (source Nearmap) Shoal formed across channel. S .Y Figure 5- Nearmap aerial taken September 23, 2020. Note shoal across the mouth of the channel. Jetty Realignment and Dredging 5250 Vanston Road, Cutchogue, NY 11935 SCTM 1000-111-10-14- Peconic Bay April 7, 2023 mill Shoal formed across channel. Figure 6: Ground photo by First Coastal date stamped 8/23/20 showing low tide shoal across the mouth of the channel. Shoal formed across channel. r 1 P . f Figure 8: Nearmap aerial taken March 13, 2021 showing a high tide shoal across the mouth of the channel Jetty Realignment and Dredging 5250 Vanston Road, Cutchogue, NY 11935 SCTM 1000-111-10-14 - Peconic Bay April 7, 2023 2021/2022 Dredging Season A similar experience occurred in the 2021/2022 dredging season. The channel was dredged just prior to the December 31 m, 2021 cutoff and was unusable for the 2022 boating season. Within a month of the dredging, First Coastal conducted a site visit to evaluate conditions. The shoal extended almost '/2 way across the mouth of the channel (see Figure 9 a, b and c from January 2022). These observations were quantified and confirmed by the hydrographic survey competed by Sea Level Mapping in February 2022, which clearly shows the shoal extending the majority of the way across the channel. (see Figure 10). Shoal more than %way across channel North Jetty Littoral Transport 4 Narrowed Navigation Channel South Jetty Figure 9 a: View to the west from the south jetty showing shoaling within one month of channel dredging. (1/20/22) Jetty Realignment and Dredging 5250 Vanston Road, Cutchogue, NY 11935 SUM 1000-111-10-14 - Peconic Bay April 7, 2023 Max Channel Width between Jetties 30 feet North Shoal Figure 9 b: View to the east from the end of the south jetty showing shoaling within one month of channel dredging. 9 c is a closeup of the same area as 9 b. (1/20/22) Narrowed Channel `-_ _ (approx.. 10 feet wide) _ y" Shoal _ Shoal r Jetty Realignment and Dredging 5250 Vanston Road, Cutchogue, NY 11935 SCTM 1000-111-10-14 - Peconic Bay April 7, 2023 • � X(NO a ` U.-\ t !- 11 4 0 1 , \ �S ! sr A pp i r Ob Y V O e J M m 4 J V Figure 10 a (above) hydrographic survey prepared by Sea Level Mapping dated February 9, 2022. Figure 10 b (below) close up of the mouth of the boat basin from the same survey. Narrowed Channel North Jetty t r I a y South Jetty Shoal t t � �It, a. Jetty Realignment and Dredging 5250 Vanston Road, Cutchogue, NY 11935 SCTM 1000-111-10-14 - Peconic Bay April 7.. 2023 A site inspection in June 2, 2022 revealed that the navigation channel was unusable due to shoaling across the entire 30 feet width of the channel between the jetties. (see Figure 11). Figure 11 Photograph taken 6/2/2022 from the south jetty looking west. The shoal is completely across the 30 foot wide channel and safe navigation is precluded for the majority of the boating season. An analysis of these two dredging events revealed that the sand shoal forming across the mouth of the 30-foot-wide channel is a narrow band approximately 50 feet from east to west. Thus, the vast majority of the boat basin and navigation channel is not impacted. Only the narrow band 50 feet wide at the seaward end of the two wooden jetties where the channel is the narrowest (30 feet wide). 4. Regulatory Compliance The proposed permit modification complies with the prevailing regulatory guidelines. The project site enjoys a current NYSDEC, USACE and Town of Southold dredging permits for the navigation channel and the boat basin. The permit history extends back at least to 1991 and includes dozens of permits for dredging as evidenced on the NYSDEC online permit system (DART). In 1996, the NYSDEC issued permits to establish a deposition basin (1-4738-00444-6, 7 & 8). The permit allowed 1,150 cubic yards of dredging with placement for beach nourishment. Those permits were extended to 2004 but subsequently expired (1-4738-00444- 2/11/13). A subsequent permit application to continue the dredging was filed in 2004 (1-4738- 00444-1 5/1 6/1 7). Those permit applications are listed as "insufficient information as of 8/1/2006" on the DART website. As a result, no permit was issued. The current permit to dredge 1,400 cubic yards of sand was issued in 2015 (1-4738- 00444-18/19/20) and was subsequently modified in 2018, 2019 and 2020. The permit is valid through 6/22/2025. The dozens of approvals granted to date all include dredging to maintain navigation with sand placement both north and south of the channel to promote coastal resilience and habitat enhancement. All of the sediment dredged to date meets the NYSDEC standard for onsite disposal as it is greater than 90% sand and less 5% Total Organic Carbon. Sediment samples in the proposed deposition basin were collected by Barron Environmental in conformance with the NYSDEC standard for sample collection. They were processed at Long Island Analytical Laboratories in April 2021. The sample results show that all of the material proposed to be dredged is greater than 90% sand and less than 5% Total Organic Carbon. Thus, these sediments also meet the standard for onsite disposal. See appendix C for a complete set of analytics. The current request is consistent with all previous approvals and represents an "Adaptive Management" approach to minimizing environmental disturbances by decreasing dredging frequency and providing for the bypass of sand to the downdrift beaches. Jetty Realignment and Dredging 5250 Vanston Road, Cutchogue, NY 11935 SCTM 1000-111-10-14- Peconic Bay April 7, 2023 S. Monitoring & Adaptive Management Plan The proposed monitoring and adaptive management plan are provided to ensure the boat basin channel mouth remains open and functional. All features of the maintenance dredging and deposition basins should be monitored annually. Monitoring Pre and post dredging monitoring consists of the following action steps: 1. Pre and post dredging hydrographic/topographic surveys of the dredging and disposal area 2. Pre and post dredging ground photographs of the dredging and disposal area 3. Pre and post dredging ortho-aerial imagery of the dredging and disposal area when available The proposed monitoring and adaptive management plan are provided to ensure the boat basin channel mouth remains open and functional and the downdrift beach is healthy and nourished. Adaptive Management/Maintenance If the monitoring reveals that there is unacceptable shoaling in the channel mouth or unanticipated changes in the disposal area, the existing design of the deposition basin and disposal area should be re-evaluated. Modification to the necessary permit(s) should be requested based on the monitoring data collected and reasonable adjustments to the design and operation of the dredging. Jetty Realignment and Dredging 5250 Vanston Road, Cutchogue, NY 11935 SCTM 1000-111-10-14- Peconic Bay April 7, 2023 6. Conclusion Vanston Bear LLC (The applicant) is requesting a permit to 1. Remove the existing 85-foot-long existing south timber jetty. 2. Construct a new 85-foot-long jetty aligned with the existing bulkhead to the east creating a new navigation channel 70 feet wide. 3. Dredge 500 cubic yards the navigation channel between the re-aligned jetties and bypass the sand around the existing boat basin channel to an approved deposition location north of the channel. 4. Dredge 1,600 cubic yards from a deposition basin south of the re-aligned jetty and place in the southern disposal area for beach nourishment and habitat creation. 5. Monitoring and adaptive management plan to confirm dredging and bypassing rates and confirm project function. The applicant provides the following justification for the permit modification: A. The proposed dredging is completely consistent with previously issued department decisions extending from 1991 to the present, as described in detail below. B. The existing NYSDEC permit (1-4738-00444/00020) allows up to 1,400 cubic yards of dredging within the channel and deposition on the upland. C. The NYSDEC has previously issued a permit to dredge 1,150 cubic yards to create a deposition basin at this site in 1996 and 2004 and to use the material for beach restoration (1-4738-00444/00006-8 and 15-17). D. The current dredging window that closes on December 31 of every year means that the channel is completely shoaled, and navigation precluded before the normal boating season in May. E. The seaward end of the boat basin channel suffers from complete shoaling that precludes navigation between the boat basin and Peconic Bay within months of dredging. F. Sand currently deposited in the channel, updrift of the jetty and offshore is prevented from moving naturally along the beach to the north causing erosion of that shoreline. Consequently, the north shoreline has retreated substantially since 1962. G. Sand bypassing is an accepted method of providing navigation and restoring natural sand flow, which will help restore the shoreline north of the channel. H. The current channel configuration (width, depth and length) at the seaward end of the jetties defining the channel does not provide sufficient capacity to contain this annual sand deposition and also allow navigation. I. The sediment to be dredged is greater than 90% sand and less than 5% Total Organic Jetty Realignment and Dredging 5250 Vanston Road, Cutchogue, NY 11935 SCTM 1000-111-10-14- Peconic Bay April 7, 2023 References: 1. Kraus, N.; Hanson, H.; Blomgren, S., 2016, Modern Functional Design of Groin Systems, 24th International Conference on Coastal Engineering, hftps:Hascelibrary.org/doi/l 0.1061/9780784400890.097 2. Sea Level Mapping, Hydrographic surveys February 9, 2022; April 2021. 3. Long Island Analytical Labs— Grain Size and Total Organic Carbon Analysis, 10/6/21