Wallingford Sewer upgrade estimates 2018

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Facility Plan - Phase 1 and 2 Wallingford, CT June 19, 2018

AECOM

Introductions --

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- Public Utilities Commission • Bob Beaumont, Chairman • Patrick Birney, Vice Chair • Joel Reinbold, Secretary

- AECOM • Dennis Setzko, P.E., Project Manager • Ken Bradstreet, P.E., Design Engineer

- Town of Wallingford Staff • Richard A. Hendershot, Director of Public Utilities • Neil H. Amwake, P.E., General Manager - Water and Sewer Divisions • Bill Phelan, Business Manager - Water and Sewer Divisions

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Fa ci Ii ty Plan Goals and Objectives

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- Determine what plant upgrades are needed to achieve present and future wastewater treatment discharge requirements - Evaluate adequacy of existing plant processes, equipment and structures and make recommendations for improvements - Ensure that the sewage disposal and growth needs of the Town are met for present and future flows and pollutant loadings • 20-year planning period

- Two-phase approach • Phase 1 (Fast Tack): Phosphorus removal and related equipment • Phase 2: Assessment of remaining plant processes and Nitrogen removal improvements

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Phase 1 - Phosphorus Treatment Evaluation -

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- Performed piloting to determine most effective phosphorus treatment option - Reviewed existing unit processes to determine effect on them with the addition of tertiary phosphorus treatment -Also reviewed additional processes and tankage needed for consistent operation. Includes: • Fine screening • Multi-point chemical addition • Secondary pump station • Electrical/SCADA upgrades • Gravity thickener improvements • Return Activated Sludge (RAS) pumps • Anaerobic tank with mixers • Secondary settling tank addition with launder covers

- Included relocation of the UV and Post Aeration system as part of the project to replace aging equipment and address current flooding issues - Miscellaneous piping and site modifications 5

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Wallingford Plant Proposed TP Project Phase 1

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Phase 1 Project Elements • Anaerobic Tank • Electrical Upgrades • Instrumentation • Secondary Settling Tank • Tertiary Phosphorus • Pump Station • Fine Screening • UV and Post Aeration • Thickener Mechanism • Site Work

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Schedule for Phase 1 - Phosphorus Removal - -

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- December 15, 2017 • Retain a consultant to prepare the study, design and oversight necessary to achieve phosphorus limits set in the NPDES permit - October 31, 2018 • Submit Engineering Report

- July 1, 2019 • Enter into a construction contract to be eligible for 50% project grant for phosphorus removal costs (design and construction)

- April 1, 2020 (No later than) • Begin construction of the phosphorus removal project

- April 1, 2022 • Com lete hos horus treatment construction project such that the treatment process is fully operational and effluent meets new phosphorus effluent requirements 7

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Phase 2 Project -WPCF Evaluation - Reviewed all existing treatment plant processes and structures - Detailed evaluation of solids handling needs - Performed process modeling to evaluate potential improvements to nitrogen and biological phosphorus removal - Building evaluation • Laboratory improvements • Administration, Personnel and other building improvements • HVAC and lighting systems

- General plant upgrades • Equipment (tank mechanisms, RBC improvements, obsolete equipment replacement)

- Communications, security, fire alarm - Electrical and instrumentation/SCADA 8

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Phase 2 - Conclusions - Solids handling systems at the end of their useful life • Anaerobic digestion as currently practiced not cost effective • Storage for sludge needed. Reuse two digester tanks for storage and provide new covers • Replace 1988 vintage dewatering facilities with screw presses. Likely to improve solids capture and reduce operating costs • Building and structures upgrades (electrical, ventilation) necessary to meet building code and process needs • Replace sludge pumping and polymer systems

- Modeling shows additional TN removal possible and better biological phosphorus removal if primary tanks bypassed • Added fine screens to Phase 1 project to capture fine solids that will affect RBC • Provide ability to bypass primary tanks 9

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Phase 2 - Conclusions (continued)

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- Expand Administration Building to include additional lab space • Lab undersized based on current standards • Lab used for both Sewer and Water Divisions operation and compliance testing • Include additional lab equipment and workspace

- Upgrade Administration Building • Windows and exterior upgrades • Interior facilities_(HVAC, lighting, coatings, restrooms)

- Personnel and other buildings • Locker rooms, finishes, and lighting improvements • Security systems lacking • In-plant communications spotty and needs upgrading • Heat and ventilation improvements • Fire alarm replacement and upgrade to code 10

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Phase 2 - Conclusions (continued) -

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- General Plant Process Upgrades • Existing electrical distribution systems in need of replacement o Motor control centers outdated and parts hard to get o Improve SCADA at the time of new equipment installation

• Grit system updates - aging and deteriorated equipment (future annual capital project) • Primary tank mechanism replacement • RBC structure repair (future annual capital project) o Concrete damage from water intrusion and/or differential expansion

• Secondary settling tank mechanism replacement • Miscellaneous site improvements o Storm drainage to alleviate floodin o Repaving where needed

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Phase 2 Work

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Solids handling

Building & HVAC Upgrades

Phase 2 Project Elements • Solids Handling • Electrical Upgrades • SCADA • Lab • Administration Building upgrades • Grit system improvements • Building upgrades • HVAC upgrades • RBC area repairs • Mechanism and Equipment Replacement Electrical Upgrades

Admin Building

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Phase 2 WWTP Improvements - Proposed Schedule and Packages _

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- Complete as discrete projects in the future. Some portions will likely be completed as part of another project. â&#x20AC;˘ For 2023-2025 o Solids Handling Improvements â&#x20AC;˘ For 2024-2026 o Plant Wide Electrical, SCADA, and Instrumentation Systems

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Phase 2 WWTP Improvements - Proposed Schedu~e and Packages - Complete as discrete projects in the future. Some portions will likely be completed as part of another project. â&#x20AC;˘ For 2027-2029 o Building Upgrades - Office, Laboratory, Personnel Building o Upgrade of Plant Lighting, Fire Alarm, Communications & Security Systems o Upgrade of Plant HVAC Systems â&#x20AC;˘ For 2031-2033 o Replacement of Aging Mechanical Equipment & Systems

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Phase 1 Cost Estimate Elements - - - - -- -- -

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- Adjustments From Prior Presentation on March 15, 2018 • Further detail provided that increased costs for o Building over UV (Item 3) o RAS pumps (Item 6) o Gravity thickener (Item 10) o Civil site/yard piping (Item 12)

• Refinement of cost estimate • Includes fine screens to replace existing aging screens (based on modeling results) • Includes a project contingency- See next slide

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Phase 1 Project Contingency -

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- Project Contingency is a cushion provided to: • Include project unknowns • Address current bid climate (multiple projects bidding at the same time) • Capture current wage and material inflation expectations • Address EPA/DEEP requirements for US iron and steel purchases • Address lack of float in the schedule o Avoiding a situation of being unable to execute an agreement before the July 1, 2019 deadline and missing out on 50% grant funding

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Phase 1 Project Estimated Costs -

Item

Description

Current Capital Cost Estimate

Previous Capital Cost Estimate

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Tertiary Phosphorus Process

$11,867,000

$11,826,000

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Secondary Effluent Pump Station

$5,480,000

$5,240,000

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Ultraviolet Disinfection and Post Aeration

$5,512,000

$5,382,000

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Demolition of Existing UV and Post Aeration

$139,000

$138,000

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Secondary Settling Tanks #5 & #6

$6,490,000

$6,450,000

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RAS Pumps

$1,053,000

$737,000

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Plant Water System

$348,000

$348,000

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Anaerobic Basin

$2,531,000

$2,514,000

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Rehabilitate Drain Pump Station

$326,000

$326,000

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Replace Gravity Thickener Mechanism

$570,000

$347,000

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Secondary Settling Tank Launder Covers

$209,000

$208,000

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Civil Site/Yard Piping

$1,213,000

$984,000

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SCADA and Instrumentation

$633,000

$630,000

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Fine Screens

$2,403,000

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Electrical Upgrade

$3,920,000

$3,909,000

Total Estimated Construction Cost

$42,694,000

$39,039,000

$3,400,000

$3,400,000

$4,600,000

$4,600,000

$5,069,000

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Engineering Design Services Construction Phase Services

Project Contingency of 10% of Total 17

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Total Estimated Cost Phase 1

$55,763,000

$47,039,000

Phase 2 Project Estimated Costs (escalated to midpoint of project execution year at 3.5% inflation per year) Capjtal Cost

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Electrical Upgrades (2025)

$2 ,605,000

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SCADA Completion (2025)

$1,391,000

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Administration Building and Lab (2028)

$3,513,000

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Lighting, Fire Alarm, Security and Communications (2028)

$2,643,000

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HVAC (2028)

$2 ,315,000

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Equipment Replacement (2032)

$7,203,000

Total Estimated Construction Cost

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$29,377,000

Engineering Services

(included in above)

Project Contingency of 5%

$1,469,000

Total Estimated Cost Phase 2

$30,846,000

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Funding Sources - Phosphorus Project Elements (Phase 1 work) • 50% state grant on phosphorus related items • 30% state grant on nutrient removal related items • 20% state grant on other eligible items • 2% - 20 year state loan on remainder of eligible work • Utility incentives for energy efficiency (motor drives, lighting)

- Other Plant Upgrades (Phase 2 work) • Fund some through annual Capital budget o Break projects into smaller subprojects that can be funded through the annual budget process

• Utility incentives for energy efficiency (VFD's, lighting, heating)

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Wrap up - WWTP has not had any major upgrades or improvements since substantial completion of the present facility was achieved on July 1, 1989 â&#x20AC;˘ Grit facilities have been partially upgraded within the past two years â&#x20AC;˘ Nitrogen removal processes included in 2005

- Most existing systems and equipment are near the end of their useful life - Many of the upgrades necessary in Phase 1 will be eligible for 50% grant and utility incentives - Packaging of other projects in future years to help level the rate impacts

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Public Workshop

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- There will be a public workshop on June 26 to discuss the project in an open forum

- Details: - Location: Room 315 Town Hall, 45 South Main Street, Wallingford, CT - Date: June 26, 2018 - Time: 6:30 pm

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Discussion

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Delivered.