Combined Sewer Overflow (CSO) Wet Weather Disinfection

Project Summary and Scope

This project is a requirement of the CSO Special Order by Consent between the City and the Virginia State Water Control Board.  The project will install three additional Trojan® Ultra Violet 4000Plus UV reactors in the existing empty UV reactor channels in the Wastewater Treatment Plant (WWTP) UV Disinfection Facility Building including installation of two new 2500 kVA (thousands of volt-amperes) 13.2 kVA– 480Volt transformers, 480V switchgear, electrical work, controls, instrumentation and other ancillary improvements. The project will also convert existing tanks for use as Primary Effluent Storage Tanks and replace the 96” diameter raw water venturi flowmeter.

Project Milestones

Construction Start – April 2018

Construction Completion –  April 2020

Project Funding

Information and documents authorizing, depicting or outlining details about the project, including, but not limited to, the following:

  1. CSO Special Order by Consent
  2. UDC Report to City Planning Commission
  3. CSO Grant Agreement with Virginia Resources Authority.
  4. Ordinance to accept funds of $45 million.
  5. DPU meets every three months with DEQ to review project status.

Project Status Updates

Construction began on April 16, 2018 with completion expected by April 2020.

Permit, information is listed below. For details please call the Department of Planning, Development and Review at 804-646-4169.

City Planning Commission Approval on March 21, 2016.

City Building Permit.

DEQ (Department of Environmental Quality) Certificate to Construct.

Expenses (costs are reported quarterly)

RAPIDS Project # 102099

Total expenditures as of 12/31/2019:  $15,953,781.00

Project Contact Information, if you have questions about this project please contact this individual.

Performance Measures and Benchmarks

Once construction begins details concerning technical details and schedule are reviewed at weekly construction progress meetings.  Actual performance of Wet Weather Ultra Violet Disinfection will be tested and measured when the system is constructed and operational.

Project Overall Status (Active, Pending or Complete)


Ordinance Information

Authorized through adoption of City Capital Improvement Program.

Contract Information

Procurement Documents (although drawings and details about the design will be available from the Procurement office, these documents should be considered as protected by the Homeland Security exception and should not be shared unconditionally with the public.  Anyone requesting access to these documents should complete and sign a FOIA request form with DPU).  

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