CIP - Sewer Fund

CIP - Sewer Fund

The Sewer Fund portion of the proposed fiscal years 2023-2028 Capital Improvement Program (CIP) totals $4,348,360 in FY2022. More information about the first-year requests can be found below. Refer to the CIP book a complete list of projects and descriptions proposed for fiscal years 2024 through 2028.

Transfer to Capital Reserve

Transfer of funds from the operating budget into a reserve account for payment of future projects and equipment. To ensure adequate funding is available for facility and infrastructure upgrades without having significant increases in water rates.

Cost: $500,000

Inflow/Infiltration Mitigation

During periods of heavy rainfall and snowmelt, clean water enters the sewer distribution system. It occasionally causes surcharging of the system resulting in the bypass of untreated sewerage to the Bellamy and Cochecho rivers. This stormwater is known as "inflow and infiltration" and must be reduced. It enters the systems through leaking maintenance holes, pipes, roof leaders, basement drains and catch basins discharging to the sewer system.

Cost: $300,000

Pump Station Equipment Replacement/Maintenance

The City of Dover has several sewer pumping stations that require upgrades and replacements. These stations must continue to be in top operating condition to prevent violations of the city's National Pollutant Discharge Elimination System (NPDES) permit.

Cost: $81,120

Heavy Equipment Replacement

This fund is used to replace heavy-duty equipment within the Water and Sewer departments. Like the Police Vehicle Replacement Program, some years have no equipment purchase, as the funds are allocated to larger purchases the following year. These vehicles are used to perform utility replacement at job sites.

Cost: $40,000

Light Vehicle Replacement

This funds the replacement of light vehicles, such as vans and pickup trucks, to transport staff and parts to job sites.

Cost: $15,000

Sewer Main Replacements – City Wide

There are sections of sewer mains throughout the City of Dover that need to be replaced due to cracks, collapse and blockages. Some of the first areas to be addressed are Atkinson Street, Trakey Street, Richmond Street, Grove Street and Central Avenue.

Cost: $162,240

Waste Water Treatment Plant General Permit Compliance

U.S. Environmental Protection Agency issued a National Pollutant Discharge Elimination System (NPDES) permit that took effect in 2021. The NPDES permit is considered a General Permit for the reduction of total nitrogen reaching Great Bay. The permit is to include Adaptive Management, and its implementation will likely require extensive data collection, water quality monitoring, and studies to assess the recovery of the estuary.

City work will also be required to perform an Optimization Study of the Waste Water Treatment Plant and a Nutrient Control Plan for the entire City of Dover.

Part of this project will update the ultra-violet light system. The effluent discharged from the wastewater treatment plant is disinfected with non-chemical addition, ultra-violet light. The current system will reach its 20-year design life in the calendar year 2023. This is a critical system to ensure safe and compliant effluent is continuously discharged.

Cost: $1,900,000

Sewer Main Replacement – Henry Law Avenue/River Street

The design for street construction, sidewalks and drainage will begin in fiscal year 2022. There is an expectation that portions of existing sewer lines will need repair and/or replacement. 

Cost: $500,000

SCADA Radio Replacement and Upgrades

Current supervisory control and data acquisition (SCADA) radios are outdated and are no longer manufactured. This project would replace SCADA radios that work with the sewer system infrastructure, well supply sites, treatment plants, water tanks, booster pump stations and remote standby generators. 

Cost: $100,000

WWTP — Capacity Upgrades, Nutrient Removal Optimization

This project would complete the replacement of the two remaining high-speed turbo aeration blowers at the wastewater treatment plant (WWTP). A third blower unexpectedly failed in 2017 and was replaced in 2020. The new blower is much more efficient, where the old blowers are inefficient and don't allow for lower flow and speed reductions. Proper aeration helps to optimize biological total nitrogen removal via the creation of oxic and anoxic zones.

Cost: $750,000

Inflow & Infiltration Removal – Phase C

Proposed work for Phase C targets the replacement of old, deteriorated sewer pipes identified with significant sources of inflow and infiltration (I/I). The elimination of I/I helps optimize flow and treatment at the wastewater treatment plant.

Cost: $250,000