FY2024 Proposed Budget

Capital Improvement Plan 2023-2027 City of Iowa City, Iowa

2023 2027 thru

Department PUBLIC WORKS

Contact Tim Wilkey

Type One Phase

V3151

Project #

Useful Life 20 years

Project Name Digester Complex Rehabilitation

Category Wastewater Treatment

Priority Critical (1)

MATCH % NONE GRANTEE NONE

TIF DISTRICT None PLAN None

Status Active

Description This project will have multiple phases to rehabilitate and improve the digester complex. The phases will include new process related structures and equipment to mitigate struvite formation and improve sludge quality. General building and equipment improvements include heat exchanger replacements, digester cover repairs and/or replacement, sludge recirculation pumps and piping, electrical, instrumentation and controls upgrades. Total Project Cost: $14,000,000

Justification Biological nutrient removal as part of the 2014 project captures phosphorous (P) and creates struvite in the digesters. It collects on piping, equipment and in structures. Current struvite management uses extensive maintenance resources. Additionally, the digester complex was constructed in 1989/2002 and the facility and equipment are at various stages of wear, nearing the end of their useful life.

Prior

Expenditures

Total

2023

2024

2025

2026

2027

900,000

900,000

1,000,000

PLANNING/DESIGN CONSTRUCTION

10,300,000

10,300,000

Total

200,000 100,000

200,000 100,000

INSPECTION

ADMINISTRATION CONTINGENCY

1,500,000 12,100,000

1,500,000 13,000,000

900,000

Total

Funding Sources REVENUE BONDS

Total

2023

2024

2025

2026

2027

14,000,000 14,000,000

14,000,000 14,000,000

Total

Budget Impact/Other This project will reduce operating and maintenance cost through the rehabilitation of older equipment and adding new equipment. The annual savings is less than $10,000 per year. This serves as a declaration of official intent under Treasury Regulation 1.150-2 that it is reasonably expected that capital expenditures will be made in respect of the above-described project, such expenditures to be advanced from the Wastewater fund, and the City reasonably expects to reimburse all or a portion of the expenditures with the proceeds of bonds, notes or other indebtedness to be issued or incurred by the City in the future.

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