Halifax Harbour Cleanup Inc. - Halifax Regional Municipality

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potential for deleterious interaction with ship anchors, and less danger to both shipping and the diffuser. 4.2.4 Evaluation of Alternative Pairs of Sites The environmental assessment process provides for the examination of alternatives for major aspects of a given undertaking, because the advantages and disadvantages of each decision must be carefully weighed and judged by all interested parties, including the public. The Panel was careful to include a requirement to consider alternative sites for the STP/OFS facility into the Guidelines for the environmental assessment early in 1991. At that point, the location for the diffuser was a given as the result of the recently completed work of the Halifax Harbour Task Force. In this section, the Panel sets out the relative advantages and disadvantages of two pairs of sites: • Ives Island STPlOFS site with diffuser west of McNabs Island (Tables 2a and 2b) • Dartmouth Ocean Terminal STP/OFS site with diffuser off Georges Island (Tables 3a and 3b) Other combinations of STP/OFS and diffuser sites were eliminated on economic and engineering grounds. Having weighed the relative advantages and disadvantages of the pairs of sites, the Panel concludes that the Ives Island STP/OFS facility and diffuser west of McNabs Island pair of sites is acceptable with the following conditions: 1. The planning and implementation of the proposed park for McNabs Island, under the direction of the Nova Scotia Department of Natural Resources, must be an integral part of the Project and of an amended funding agreement. 2. HHCI should cooperate with the Department of Natural Resources to consider and resolve issues of concern in the development and implementation of the park plan. 3. HHCI should work in partnership with the Eastern Passage community to resolve land-use planning issues relative to the development of the STP/OFS facility in the District 6 Municipal Planning Strategy. 4. There should be no Project construction or operations activities on McNabs Island. However, the Panel also concludes that the Dartmouth Ocean Tem$nal STPlOFS and Georges Island diffuser pair of sites has some significant advantages over the Ives Island/west of McNabs Island pair, and deserves serious evaluation. Like the Task Force, the Panel confirms the greater potential for containment in the Inner Harbour at the Georges Island diffuser site. This, along with many advantages of an onshore STP/OFS facility location and concerns about the basic incompatibility of the Ives Island development with the planned McNabs Island park, causes the Panel to favour an examination of the Dartmouth Ocean TerminallGeorges Island pair. 0 Site is at sea level Table 2a 0 Remoteness from residential communities • Proximity to diffuser site (650 m) • Some economic benefits to Eastern Passage which might not otherwise accrue • Acceptance of site by municipalities Advantages and Dlsadvantages,of Ives Island STPlOFS Site I Disadvantages • High costs for construction of artificial island • High plant construction, servicing, energy, and transport costs due to island location . Transportation and community impacts from importing fill to create island • Zoning conflict: industrial use versus adjacent parkland zone 0 Impacts on McNabs Island parkland and cultural resources b More difficult access during construction and operation and for emergency response • Residual visual impacts of STP/OFS facility in relation to I&Nabs Island and Harbour • Future expansion is costly; visual mitigation process begins all over again . If the OFS technology fails, alternative sludge management is complicated by size of island and transport to shore • Loss of marine recreational, anchorage and archaeological sites in Ives Cove • Halifax Co. District 6 (Eastern Passage) would have to accept two sewage treatment plants
Issues 19 Table 2b Advantages Advantages and Disadvantages of Diffuser Site West of McNabs Island Disadvantages • Cleared by port authorities for use . Fewer toxic organic and metal contaminants associated with fine particulates will be contained in the Inner Harbour • Offers good dilution and dispersion characteristics • Toxic organic and metal contaminants associated with fine • Little chance of deleterious phytoplankton blooms particulates coming to rest in the Outer Harbour have potential • Liffle danger of impacts from anchoring for long-term bioaccumulation and biomagnification in commercially important fish and lobsters, and other marine species • Located less than 1 km from Black Rock Beach and 2 km from Maugher Beach, so higher probability of swimming beach closure Table 3a Advantages Advantages and Disadvantages of Dartmouth Ocean Terminal STPlOFS Site Disadvantages 0 Site is at sea level a Availability of site is unknown • Lower site development costs • Existing land USBS will have to be replaced 0 Lower operating costs • Community acceptance may be difficult • Area zoned industrial, and has been surrounded by • Site has not been subject to full environmental assessment industrial and commercial sites for many years and public consultation • Site is underutilized • Direct access from major transportation routes • STP could be built into site, backsloped, tiered and landscaped to mitigate aesthetic impacts • Services, including utilities and emergency response, nearby 0 Lower operating costs for energy • Should OFS technology fail, onshore site provides flexibility for alternative sludge management systems • When expansion is required, site can be filled out to approximately 12 m depth using wharf retaining walls instead of creating earth-filled site out to greater depths • Proximity to Georges Island diffuser site (750 m) • Overland collection system\from Eastern Passage to STP is less costly and safer than from Eastern Passage to Ives Island • Good opportunity for public education and interpretation of STP/OFS facility, as access is not a problem
Page 1 and 2: Halifax Harbour Cleanup Project
Page 3 and 4: CanacEi X NOVA SCOTIA Minister of t
Page 5 and 6: 4.8 SEWAGE TREATMENT AND SLUDGE MAN
Page 7 and 8: Summary 1 1. SUMMARY In November 19
Page 9 and 10: Project And Review Perspective 3 2.
Page 11 and 12: Project And Review Perspective 5 2.
Page 13: Project And Review Perspective 7 Th
Page 16 and 17: 10 Halifax Harbour: The Receiving E
Page 18 and 19: 12 Halifax Harbour: The Receiving E
Page 20 and 21: treatment necessary to meet the wat
Page 22 and 23: 16 Issues that were of concern rega
Page 26 and 27: 20 Issues Table 3b Advantages Advan
Page 28 and 29: • Stewardship . Full Cost Account
Page 30 and 31: 24 Issues Some objectives from thei
Page 32 and 33: 26 Issues 0 deleterious acute, chro
Page 34 and 35: 26 Issues Association has developed
Page 36 and 37: 30 Issues 2. ldentify key actors an
Page 38 and 39: 32 Issues Those existing outfalls t
Page 40 and 41: 34 issues Table 5 Advantages Advant
Page 42 and 43: • Options for treatment plants we
Page 44 and 45: 38 Issues • limited opportunities
Page 46 and 47: 40 Issues 4.8.2 Level of Treatment
Page 48 and 49: 42 Issues SLUDGE TREATMENT (06) Fig
Page 50 and 51: 44 Issues 7. Exhaust gases from the
Page 52 and 53: 46 Issues 0 The predesign report fo
Page 54 and 55: 48 Issues Concerns about the visual
Page 56 and 57: 50 Issues r d) the Project agreemen
Page 58 and 59: 52 Issues 4.10 CONSTRUCTION OF THli
Page 60 and 61: 54 Issues . ;, • negative effects
Page 62 and 63: 56 Issues The Panel approves of HHC
Page 64 and 65: of Halifax) may be left in limbo, a
Page 66 and 67: 60 Issues HHCI has provided a listi
Page 68 and 69: for the integrity of construction a
Page 70 and 71: 64 Issues Loss of lobster fishing a
Page 72 and 73: 66 Recommendations 16. The Panel re
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66 Recommendations I) a survey and
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70 Recommendations 71. The Panel re
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APPENDIX B MANDATE FOR THE PANEL RE
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74 APPENDIX C TECHNICAL SPECIALISTS
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76 APRIL 1. 1993 APRIL 3,1993 HALIF
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kchemlcal oxygen demand (BOW MoWdow
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Halifax Harbour Cleanup Inc. - Halifax Regional Municipality

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