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HomeMy WebLinkAboutBCC_08.08.23_Hearing_Final (Reduced)08/08/2023 Barnstable Conservation CommissionNew England Wind 1 Connector Avangrid Offshore Wind August 2023 2 Content Holly Carlson Johnston, Associate, Epsilon Associates, Inc. Jack Vaccaro, Senior Consultant, Epsilon Associates, Inc. 02 Project Description 03 Discussion and Q&A Pat Johnson, Manager of External Affairs, Avangrid 0 1 Welcome & Project Overview Hans van Lingen, Permitting Manager, Avangrid Ken Fitzgerald, Senior Principal, Stantec 3 Project Overview Key Project Facts 800+ MW OCS-A 0534 Anticipated federal approval Q1 2024 Anticipated 2027 100% Avangrid 40+ miles from Barnstable West Barnstable Capacity Federal lease area Permitting status Commercial operation Ownership Distance to shore Interconnection point Park City Wind 4 Project Benefits 800 + Megawatts (MW) of clean, renewable energy delivered to the New England grid, powering approximately 400,000 homes and businesses Reduces greenhouse gas emissions by 1.5 9 million US tons per year, the equivalent of taking over 310,000 cars off the road Creation of 4,700 direct, full -time equivalent (FTE) job -years across MA and CT Improving grid reliability and delivering clean power locally to Cape Cod 5 Project Benefits in Barnstable Host Community Agreements and Tax Revenue –Signed Host Community Agreement (HCA) with the Town of Barnstable in 2022 –Includes host community fees of $16 million –Avangrid will be one of the largest taxpayers to the Town of Barnstable, West Barnstable Fire District, and COMM Water District, with little demand for town services Coordination on Sewer Work –Coordination with Barnstable DPW to install duct bank with t he Town of Barnstable’s sewer lines to advance the Town’s sewer project and defray associated costs and disruption Minimizing Disruption –Parking lot and in-road work limited to non-summer months 6 Project Overview & Offshore Export Cable Corridor –800+ MW offshore wind energy g eneration facility (federal waters, 41 miles from Cape Cod –Offshore export cable corridor –6.6 miles in Barnstable waters –Largely the same as for Vineyard W ind Connector –2 offshore export cables –Target burial depth of 5-8 feet –4-mile onshore export cable route to proposed substation –Interconnection at the West Barnstable Substation 7 Landfall Site & Offshore-to-Onshore Transition –Landfall site is the paved parking lot at Craigville Public Beach –Horizontal directional drilling will avoid nearshore and beach impacts –Burial depth of ~40 feet at the High Tide Line –Piping Plover Protection Plan, approved by NHESP, will avoid impacts 8 Onshore Transmission Route –Route extends about 4 miles from the landfall site to proposed substation –Follows existing roadway layouts (Craigville Beach Road, Main Street, Old Stage Road, Shootflying Hill Road). –4-mile-long buried concrete duct bank with splice vaults installed at every 15 0 0 -2500 feet. –Trenchless crossing of Centerville River by microtunnel –No permanent impacts to wetlands or rare species habitat –Extensive coordination with the Town of Barnstable –Variant 2 is no longer considered a viable alternative. 9 Buried Duct Bank •Duct bank will have eight conduits for the six o nshore conductors (two spares), with smaller conduits for fiber optic communications cables. •Conduits typically arranged in a four wide by two deep configuration and encased in concrete. •Trench will measure 9-11 f e e t wide at the road surface (typically occupies one travel lane). •Target burial depth is 3.5 feet but depth could be reduced if needed to provide required separation from other buried utilities. 10 Splice Vaults -Cable splicing will be required at various p oints along the onshore transmission route. -Splice vault pairs will be installed at intervals of every 1,500 to 2,500 feet along the onshore route. -At each splice vault location, the excavated area will be expanded to approximately 20 feet wide by 50 feet long . -Due to their size, the positions of the two splice vaults will be staggered one in front of the other in order to reduce the required area of disturbance. 11 Onshore Transmission Route-Wetland Areas Buffer zones of wetland resource areas in the vicinity of Wequaquet Lake. Inland Bank/Beach Freshwater Wetlands Previously disturbed coastal resource areas between the cable landfall and the Centerville River crossing Barrier Beach System Coastal Dune LSCSF Riverfront Area Buffer zones of other coastal resource areas at the Centerville River crossing Land Under the Ocean Land Containing Shellfish Salt Marsh Coastal Bank 12 Onshore Duct Bank Route & Wetland Resource Areas -Duct bank will be installed beneath p avement of Shootflying Hill Road. -Trench area to be restored at the end o f each work day. -Utility work in a buffer zone meets the c riteria of "Minor Project"and is exempt from regulations established under Wetlands Protection Act (310 CMR 10.02). -Barnstable Conservation Commission retains jurisdiction over work in this area under the town's Wetlands Protection Bylaw (Ch. 237). 13 Onshore Duct Bank Route & Wetland Resource Areas –Duct bank to be installed b eneath the pavement of Craigville Beach Road –Southern portion of Craigville Beach Road is within Barrier Beach system and LSCSF . –Small area of Coastal Dune will be temporarily disturbed by construction and will be restored and replanted following duct bank installation. 14 Coastal Dune Restoration Plan Coastal Dune between TJB vaults and Craigville Beach Road. –Narrow, isolated strip (approx. 420 square f eet of impact) –Dune restoration plan 15 Centerville River Crossing –Reinforced concrete pipe installed at least 10’ below river bottom by micro -tunneling. –Avoids impacts to the river and its associated resource areas. –Jacking shaft and staging area at 2 Short Beach Road (south side of crossing) within the 200 - foot Riverfront Area (RFA) –Receiving shaft and transition v aults will be installed within the road layout north of the river and beyond the 200 -foot RFA. 16 Centerville River Crossing (Microtunnel ) -Microtunneling is a remotely controlled pipe jacking operation that utilizes a microtunnel boring machine (MTBM). -The MBTM is pushed into the earth by hy draulic jacks mounted in the jacking shaft. -Concrete casing pipe is lowered into the shaft and inserted between the jacking frame and the MTBM or previously jacked pipe. -Upon completion of the tunnel, equipment is removed, the carrier pipeline is pulled through the concrete casing pipe utilizing rollers, and the annular space is grouted. CUTAWAY VIEW OF A MICROTUNNEL SETUP 17 Centerville River Crossing (Slurry Recycling) -Microtunneling requires the use of a bentonite slurry to cool the drill bit, lubricate the bore hole, and provide a medium to carry drill cuttings back to the point of entry. -The slurry/ cutting mix is then processed using a separator plant to remove cuttings from the slurry for transfer to large metal bins for transport offsite -The processed slurry is then recycled for reuse in the microtunneling operation. -Bins containing t he processed cuttings will be staged at the Craigville Beach parking lot prior to transport offsite. CUTAWAY VIEW OF A MICROTUNNEL SETUP 18 Centerville River Crossing (Dewatering) -Jacking shaft will be constructed to be "water-tight" but some amount of seepage of groundwater into the shaft is anticipated -Dewatering, or the removal of groundwater f rom the shaft, will be required during the tunneling operation. -Water gathered from the shaft by the d ewatering system will be discharged at an upland location using on-site storage (frac tanks) and appropriate filtering apparatus. -Dewatering system will be monitored daily f or turbidity as required under the EPA Construction General Permit. -Any use of catch basins for the discharge of w ater will require town approval.CUTAWAY VIEW OF A MICROTUNNEL SETUP 19 Site Restoration Plan for 2 Short Beach Road 20 Visual Simulations for Site Restoration at 2 Short Beach Road 21 Visual Simulations for Site Restoration at 2 Short Beach Road 22 Visual Simulations for Site Restoration at 2 Short Beach Road 23 Visual Simulations for Site Restoration at 2 Short Beach Road 08/08/2023 New England Wind 1 Connector Thank You Avangrid Offshore Wind August 2023