Coast Guard Cutter Eagle Homeport Pier Homeport Pier Evaluation
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DEPARTMENT OF HOMELAND SECURITY UNITED STATES COAST GUARD CIVIL ENGINEERING UNIT PROVIDENCE COAST GUARD CUTTER EAGLE HOMEPORT PIER HOMEPORT PIER EVALUATION UNITED STATES COAST GUARD PIER 7, STATE OF CONNECTICUT, FORT TRUMBULL NEW LONDON, CONNECTICUT USCG Contract No. HSCGG1-16-D-PRV087 USCG Task Order No. HSCGG1-17-J-PRV178 AUGUST 2017 Prepared for: United States Coast Guard Civil Engineering Unit Providence 475 Kilvert Street, Warwick, RI 02886 Prepared by: Distribution limited to U.S. Government agencies and their contractors; administrative/operational use. Other requests for this document shall be referred to the United States Coast Guard CEU Providence. EXECUTIVE SUMMARY Coast Guard Cutter EAGLE Homeport Pier Homeport Pier Evaluation Pier 7, State of Connecticut, Fort Trumbull New London, Connecticut The purpose of this assignment was to perform a Routine Waterfront Facility Inspection, a structural load rating, and berthing analysis in support of a gap analysis of Pier 7 to meet the Basic Facility Requirements (BFR) for the CGC EAGLE. A structural inspection of Pier 7 at the State of Connecticut owned Fort Trumbull was conducted on June 20 and 21, 2017, by a four person, engineer diver team from Childs Engineering Corporation. Fort Trumbull is located in New London, Connecticut at 90 Walbach Street. The following narrative serves to briefly summarize the recommended improvements required to meet the BFR in four key areas, Structural, Berthing, Mechanical Utilities, and Electrical Utilities. Due to the berth having suitable depths closer inshore two options were looked at. An outshore option with the CGC EAGLE berthed in the historic location and the pier completely repaired, and an inshore option with the CGC EAGLE berth further inshore and with only the necessary piles being repaired. For the Structural repairs it was recommended that the piles would have concrete structural jackets to provide a longer term repair that anodes. The jackets would either be from the base of the existing jacket to below the mudline or for existing jackets that are in poor condition a new jacket would be placed the entire length. In addition all the spalls would be repaired on the pile caps and deck and the deck would be sealed. For the berthing repairs and upgrades it was recommended that two sections of timber fender piles would be added and three sea cushions to allow the load to spread out both on the fender system and across the mooring hardware. The bollards would also be cleaned and recoated and the foundations repaired, as needed. For the mechanical utility upgrades it was recommended that new heat traced water and sewer lines would be needed as none currently exist on the pier. In addition a wastewater treatment system would be added to the existing unheated sewer line so that it could be used for the bilge water. The fire protection would come from either stand pipes or additional connections on the potable water pipe for hydrants. i Most of the electrical and telecommunication utilities appear to be at the pier however it was recommended that a one cable and one LAN line would be run out to the site and that this would be contained inside a new conduit run out to the site. For the inshore option a new utility mound was also need to be installed. The summary of cost for the upgrades and repairs for the outshore options can be found in Table 1 below and in Table 2 for the inshore option. Requirement Estimated Cost Structural Repairs $7,070,441 Berthing Repairs $237,608 Mechanical Utilities $1,215,200 Electrical Utilities $51,240 TOTAL $8,575,343 Table 1 – Summary of Estimated Repair Costs to Meet CGC EAGLE BFR at the Outshore End of Pier 7 Requirement Estimated Cost Structural Repairs $3,335,203 Berthing Repairs $237,608 Mechanical Utilities $696,500 Electrical Utilities $49,105 TOTAL $4,318,416 Table 2 – Summary of Estimated Repair Costs to Meet CGC EAGLE BFR at the Inshore End of Pier 7 ii Table of Contents PAGE 1.0 INTRODUCTION ........................................................................................ 1 1.1 Purpose and Scope ......................................................................... 1 1.2 General Description of the Facility ................................................... 2 1.3 Units Serviced ................................................................................. 2 2.0 EXECUTIVE SUMMARY FOR THE WATERFRONT INSPECTION ........... 2 3.0 DESCRIPTION OF THE STRUCTURES EXAMINED ................................ 4 3.1 Approach Pier .................................................................................. 4 3.2 Pier 7 ............................................................................................... 4 3.3 Pier 7 Fender System ...................................................................... 4 4.0 DATA COLLECTION PROCEDURES ....................................................... 5 5.0 OBSERVATIONS AND EVALUATIONS .................................................... 5 5.1 Environmental Conditions ................................................................ 5 5.2 Approach Pier .................................................................................. 5 5.3 Pier 7 ............................................................................................... 7 5.4 Pier 7 Fender System ...................................................................... 9 6.0 LOAD RATING ........................................................................................... 10 6.1 Description of Structures and Vehicles Analyzed ............................ 11 6.2 Structural Analysis of Pier 7 ............................................................ 11 7.0 BERTHING ANALYSIS .............................................................................. 13 7.1 Environmental Conditions and Vessel Characteristics .................... 13 7.2 Mooring Analysis of the CGC EAGLE at Outshore End of Pier 7 .... 14 7.3 Mooring Analysis of the CGC EAGLE at Inshore End of Pier 7 ....... 15 8.0 HYDROGRAPHIC SURVEY ...................................................................... 16 9.0 GAP ANALYSIS ......................................................................................... 17 9.1 CGC EAGLE Basic Facility Requirements ...................................... 17 9.2 Structural Gaps at Pier 7 ................................................................. 18 9.3 Berthing Gaps at Pier 7 ................................................................... 19 9.4 Utility Gaps at Pier 7 ........................................................................ 19 v 9.4.1 Mechanical Utility Gaps ....................................................... 20 9.4.2 Electrical Utility Gaps .......................................................... 20 10.0 COST ESTIMATE FOR REPAIRS TO MEET BFR .................................. 21 Appendix A – Assessment Report ..................................................... A-1 through A-7 Appendix B – Figures ....................................................................... B-1 through B-16 Appendix C – Photographs ............................................................... C-1 through C-25 Appendix D – Structural Calculations ................................................ D-1 through D-53 Appendix E – Berthing Calculations .................................................. E-1 through E-20 Appendix F – Cost Estimates ............................................................ F-1 through F-4 Appendix G – Miscellaneous Data .................................................... G-1 through G-15 v COAST GUARD CUTTER EAGLE HOMEPORT PIER HOMEPORT PIER EVALUATION PIER 7, STATE OF CONNECTICUT, FORT TRUMBULL NEW LONDON, CONNECTICUT 1.0 INTRODUCTION 1.1 Purpose and Scope The purpose of this assignment was to perform an evaluation of the Pier to be used as a homeport for the CGC Eagle. This evaluation included routine inspection of the above water and underwater components of the waterfront facilities of Pier 7, a structural load rating, and berthing analysis in support of a gap analysis of the pier to meet Basic Facility Requirements (BFR) for the CGC EAGLE. Pier 7 is located at the State of Connecticut owned Fort Trumbull, in New London, Connecticut. The inspection was intended to assess the general overall condition of each structure, assign a condition assessment rating, and to assign recommended actions and costs to meet the BFR. Additional analysis objectives included the quantitative evaluation of local loss of structural capacity of typical components as a result of damage or deterioration, permissible load limits analysis by quantitative evaluation of the global structural integrity relative to actual loads of each structure, estimating the remaining useful life of each structure, and to develop an order of magnitude estimate of probable costs for rehabilitation work. Photographs were taken to document the typical conditions of the facilities and areas of damage or deterioration. A summary of findings from the inspection can be found in the Assessment Report located in Appendix A. Childs Engineering Corporation worked as a consultant for the USCG Civil Engineering Unit, Providence, in the evaluation of this facility. The points of contact for this project were Lieutenant Kieron McCarthy (401-736-1789), Design Project Manager for the U.S. Coast Guard, and Mr. David Cass (401-736-1734), Senior Design Manager for the U.S. Coast Guard. 1 1.2 General Description of the Facility Pier 7 is owned by the State of Connecticut and is