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Ledyard Wastewater Facilities Management Plan

Ledyard Wastewater Facilities Management Plan. A Presentation to the Ledyard Town Council/ Water Pollution Control Authority By Maguire Group Inc. January 11, 2011. Facilities Management Plan. Required by CT DEP Phased approach Phase I – Analysis of needs in outlying areas

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Ledyard Wastewater Facilities Management Plan

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  1. Ledyard WastewaterFacilities Management Plan A Presentation to the Ledyard Town Council/ Water Pollution Control Authority By Maguire Group Inc. January 11, 2011

  2. 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

  3. 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

  4. File Review

  5. Environmental Conditions

  6. State C&D Plan – Consistency

  7. Needs Analysis • Areas of Concern • Aljen Heights • Avery Hill • Christy Hill • Gales Ferry • Growth on Route 12

  8. 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

  9. Study Areas

  10. Study Areas

  11. Connection to Town of Groton LEDYARD GROTON Ohio Avenue 10-inch sewer main

  12. 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

  13. 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

  14. 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

  15. 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

  16. 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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