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Appropriate Assessment Report Appropriate Assessment Report Alexandra Basin Redevelopment Project (FS005699) Project Description In July 2015 Dublin Port Company submitted an application, accompanied by an Environmental Impact Statement (EIS), and a Natura Impact Statement (NIS) for a foreshore lease / licence to carry out works on the foreshore as part of the Alexandra Basin Redevelopment Project (ABR). Planning permission for the Project was granted by An Bord Pleanala, subject to 16 No. Conditions, in June 2015. (Bord Pleanala Reference Number: 29N.PA0034) The ABR Project comprises three main elements: 1. Works at Alexandra Basin West: which includes construction of new quays and jetties, remediation and reuse of contaminated sediments in the basin, capital dredging to deepen the basin and to achieve depths of -10m Chart Datum (CD) at the new berths. 2. Infilling of the Basin at Berths 52 & 53 and construction of a new river berth with a double tiered Ro-Ro ramp. 3. Deepening of the fairway and approach to Dublin Port to increase the depth from - 7.8m CD to -10.0m CD. It is noted, however, that the disposal of dredged material at sea requires a Dumping at Sea Permit from the EPA. The proposed disposal of dredge spoil at this site as part of Alexandra Basin Redevelopment Project is the subject of an application for a Dumping at Sea permit to the EPA. (EPA Ref S0024-01) and the effect of this activity on designated Natura 2000 site will be considered by the EPA as part of the Dumping at Sea Permit determination process. It is proposed that the following works will be carried. Alexandra Basin: The infilling of Graving Dock No.2 The excavation and restoration of Graving Dock No.1. The removal of infill material The relocation of the ore concentrates loading system within Alexandra Basin West The relocation of double deck ramp No.4 to new river berth at Berths Nos. 52/53 The demolition of: The bulk jetty A section of North Wall Quay Extension 1 Five control rooms/buildings/oil bunds A floating ramp on the Liffey side of North wall Quay Extension A lead-in jetty at Graving Dock No.2 within the Basin The construction of: New quay walls at North Wall Quay Extension (937m in length) including a rounded eastern end using salvaged stone material from demolished sections of quay. Moving and reconstruction of existing light house to the east end of revised North Wall Quay Extension Refurbishment of existing quay walls along Ocean Pier (approximately 555m in length) Refurbishment of existing quay walls along Alexandra Quay West (approximately 400m in length) Extension of Alexandra Quay West (130m in length) Construction of new quay wall along Crossberth Quay (approximately 250m in length) New 273m long Ro-Ro jetty and provision of three Ro-Ro ramps Interpretative glazed pavilions (36sq.m.) on the W of the reconfigured North Wall Quay Extension and the presentation of a salvaged historic concrete block from the demolished section of the quay The dredging of: 470,000m3 of contaminated material to a depth of -10.0m Chart Datum (CD) over an area of 19.4Ha within the redeveloped Alexandra Basin and its subsequent remediation. Conservation works to the existing pump house and to retained sections of North Wall Quay Extension Berths 52 and 53 The demolition of: Existing Berths 52 and 53 Jetty at Berth 52 Concrete Dolphin at Berth 53 The construction of : A new 300m quay wall at Berth 52 / 53 A new 75m mooring jetty for New Berth 52 New 40m long mooring jetty to extend existing Berth 49 (50m long) 2 The infilling of the Terminal 5 Ro-Ro basin (circa 4.565 Ha) The raising of existing levels by 1.4m over an area of 9.5 Hab.m. Dredging of new river berth to -10m CD Liffey Channel Construction of a marina protection structure to a height of +7.0m CD and a length of 220m on the South side of the River channel. Dredging of the shipping channel to a depth of -10m CD from a point 55m to the East of the East Link Bridge to a location in the vicinity of Dublin Bay a total distance of 10.3Km It is envisaged that stabilisation works will be required to the Great South Wall to negate any impact from the channel dredging and realignment. These works will include the placement of additional rock armour to protect the existing rock armour slopes around the Bull lighthouse which prevents any undermining of the existing structure. Also, the steepened dredge side slopes of the navigation channel will be stabilised at this location using concrete mattresses Drawings: The location and details of works on the foreshore are shown in the following Drawings submitted by the applicant: Drawing No. IBM0569-FS-001, “Overall Site Layout on A3”, Rev A , dated 19/11/2014 Drawing No. IBM0569-FS-002, “Site Location Maps, Rev A, , dated 19/11/2014 Drawing No. IBM0569-FS-003, “Site Location of Alexandra Basin, Rev A, dated 19/11/2014 Drawing No. IBM0569-FS-004, “Site Location at New Berth 52” Rev A, dated 19/11/2014 Drawing No. IBM0569-FS-005, “Dublin Port Company Lease Areas Showing Proposed Works” Rev A, dated 19/11/2014 Drawing No. IBM0569-FS-006, “Demolition Plan At Alexandra Basin ” Rev A, dated 19/11/2014 Drawing No. IBM0569-FS-007, “Demolition Plan At New Berth 52 ” Rev A, dated 19/11/2014 Drawing No. IBM0569-FS-008, “Proposed General Arrangement Alexandra Basin Sheet 1,” Rev A, dated 19/11/2014 Drawing No. IBM0569-FS-009, “Proposed General Arrangement Alexandra Basin Sheet 2,” Rev A, dated 19/11/2014 Drawing No. IBM0569-FS-0010, “Proposed General Arrangement Alexandra Basin Sheet 2,” Rev A, dated 19/11/2014 3 Drawing No. IBM0569-FS-0011, “Proposed General Arrangement At New Berth 52,” dated 19/11/2014 Drawing No. IBM0569-FS-0012, “Proposed Sections at Alexandra Basin Sheet 1”, dated 19/11/2014 Drawing No. IBM0569-FS-0013, “Proposed Sections at Alexandra Basin Sheet 2”, dated 19/11/2014 Drawing No. IBM0569-FS-0014, “Proposed Sections at New Berth 52”, dated 19/11/2014 Drawing No. IBM0569-FS-0015, “Proposed Marina Layout and Section”, dated 19/11/2014 Drawing No. IBM0569-FS-0016, “Proposed Channel Works at New Berth 52 and Great South Wall”, dated 19/11/2014 Drawing No. IBM0569-FS-0017, “Channel Works at New Berth 52 and Great South Wall Typical Sections”, dated 19/11/2014 Drawing No. IBM0569-FS-0018, “Site Location Plan with Co-ordinates”, dated 19/11/2014 Drawing No. IBM0569-FS-0019, “Permanent Structures at Alexandra Basin”, dated 19/11/2014 Drawing No. IBM0569-FS-0020, “Permanent Structures and drilling at Berth 52”, dated 19/11/2014 Drawing No. IBM0566-FS-0021, “Foreshore Ownership at Alexandra Basin”, dated 19/11/2014 Drawing No. IBM0569-FS-0022, “Foreshore Ownership at Berth 52”, dated 19/11/2014 Phasing of the works Construction Works The construction activities are divided between two primary work streams: the civil engineering works required to facilitate the creation of deep berths and enclose Berths 52 / 53 and dredging of the main channel and of Alexandra Basin West. These civil engineering works are broken into three distinct, sequential phases, largely determined by port operational requirements. It is anticipated that each of the three phases will last between 18 and 24 months, overlapping to give construction duration of 36 - 47months. Phase 1 It is envisaged that the following works will be undertaken during Phase 1: Construction of new quay walls and the reconfiguring of existing loading facilities within the North West corner of Alexandra Basin West Demolition of existing vessel loading jetties and plant Re-fronting of Ocean Pier 4 Construction of the new berths on Crossberth Quay Relocation of customers from existing Berths 52 / 53 to Crossberth Quay berths The anticipated form of construction for the quay walls within Alexandra Basin West will comprise a steel combi-wall. This will consist of sheet piles extending between intermittent king piles. It is anticipated that the primary piles of the new quay walls will be installed to depths ranging between -20m ODM and -35m ODM, with the final depths depending on the local ground conditions and proximity to the standard dredge depth. In areas of relatively shallow bedrock the piles will be cored into the rock as required to achieve overall stability of the quay structure and to sustain any imposed loads. Intermediate sheet piles forming quay walls will be installed to depths in excess of the standard dredge depth to protect against undermining and loss of material from behind the quay wall. The final design and construction depth of intermediate sheet piles will be determined by local material properties but will extend beyond the dredge depth by 2-4m. The quay wall will be tied to a sheet piled anchor wall or a reinforced concrete anchor beam, depending on the proximity of existing structures/operations to the quay side. The berthing face to the quay structure will be formed by the installation of a reinforced concrete capping beam. Fenders will be fixed to the concrete capping beam to provide a suitable berthing face. The deck behind the combi-wall quay will be reinstated to tie-in with the existing surfacing and deck levels. The form of construction for the 273m long Ro-Ro jetty proposed for Alexandra Basin will be an open pile structure, constructed using a series of piled mooring dolphins, which will be connected using a steel walkway structure. Phase2 It is envisaged that Phase 2 will include the following works: Closure of Berths 52 / 53 Construction of New Berth 52 (river berth) Re-fronting of Alexandra Quay West Dredging of Alexandra Basin West Treatment of dredge material and infilling of Graving Dock No.
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