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 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

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

File Review

Environmental Conditions

State C&D Plan – Consistency

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

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

Study Areas

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

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

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

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

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

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