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Ledyard Wastewater Facilities Management Plan A Presentation to the Ledyard Town Council/ Water Pollution Control Authority By Maguire Group Inc. January 11, 2011
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Facilities Management Plan Required by CT DEP Phased approach Phase I – Analysis of needs in outlying areas Data gathering and mapping Needs analysis Preliminary alternatives analysis Preliminary treatment plant review Approved by CT DEP Phase II – To be completed Detailed alternatives analysis
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Phase I – Data Gathering & Mapping Reviewed files at LLHD Dimensional variances History of well contamination History of illegal discharges Interviewed staff at LLHD Environmental mapping evaluation Future Development
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File Review
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Environmental Conditions
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State C&D Plan – Consistency
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Needs Analysis Areas of Concern Aljen Heights Avery Hill Christy Hill Gales Ferry Growth on Route 12
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Preliminary Alternatives Analysis Repair/replace existing on-site systems New community treatment/disposal systems within Ledyard Connect to neighboring towns (Preston and Groton) Connect to Town of Ledyard WWTF
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Study Areas
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Ohio Avenue 10-inch sewer main LEDYARD GROTON Connection to Town of Groton
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Preliminary Treatment Plant Review Flows – Reduce infiltration/inflow (I/I) to plant Effluent – In compliance with permit Plant Processes – In need of upgrades to be considered in Phase II Preliminary Recommendations Spare effluent pump Spare bulbs and controller for UV system
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Next Step – Phase II Future growth and impact on Ledyard WWTP Alternatives proposed by DEP Evaluate a small treatment facility on Thames River servicing Aljen Heights and Avery Hill Evaluate costs of interconnection with Norwich State Hospital to service Aljen Heights and Avery Hill Evaluate reuse of wastewater discharges from Avery Hill and Aljen Height at large nursery on Route 2A
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Next Step – Phase II Treatment Plant Upgrade Considerations Headworks Bar screen, grit pit, influent pump controls Sequencing Batch Reactors (SBRs) Chemical addition expansion Replace decanters Additional SBR tank for future flows (if required) High-Speed Turbo Blowers Including dissolved oxygen controls Backup Ultraviolet Disinfection
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Next Step – Phase II Treatment Plant Upgrade Considerations (cont.) Effluent Dosing Chamber Improvements Instruments and Controls Upgrade SCADA system from Windows 95 Additional SCADA controls and monitoring Upgrade autodialer Seepage Beds Limitations Demolish Old Plant
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Funding Options Clean Water Fund Planning Assistance Reserve DEP reimburses 55% of eligible costs Town can apply for Phase I & II funding Funding available on a first-come/first-serve basis Clean Water Fund Priority List Ranked 131 out of 168 for I/I Rehab ($200K) Small Town Economic Assistance Program (STEAP) Working with Developers
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