Interceptor Chemical Odor Control Project

MCES Project No. 819011

Understandably, the spread of COVID-19, also known as the coronavirus, has raised questions about the status of Metropolitan Council Environmental Services (MCES) plant and interceptor construction projects. Please note the following:

  • Construction on wastewater treatment plants and sewer interceptors will continue. The contractors are following working environment protocols (asking employees to stay home if they are sick, social distancing, etc.) as outlined by public health agencies.

  • Some project staff are working remotely while others remain on-site to ensure proper oversight of the project. Staff will stay connected through emails, conference calls, and web-based meetings to manage construction activities.

Contact information

For information regarding construction, please call the construction hotline or send an email to the contact information listed on the bottom of that project’s website.

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Minnesota's response to COVID-19

The latest information on the state’s response can be found on the Minnesota Department of Health website.

 

 

Text Alert Icons Project Alert

Project Update - August 2021. See below for previous Project Updates.
 

Project Description

Metropolitan Council Environmental Services (MCES), operator of the metro-area wastewater collection and treatment system, proposes entering into two contracts to support odor and corrosion control within the regional sanitary sewer system. MCES’s 600-plus miles of regional sanitary sewers (also known as interceptor sewers) convey wastewater from approximately 5,000 miles of local sanitary sewers to MCES’s nine wastewater treatment plants located throughout the region.

MCES's proposed contracts include:

 
  1. A design-build contract to provide engineering and construction services for odor and corrosion control systems.
  2. A contract for operations, maintenance, and replacement of 16 odor and corrosion control systems currently located within the interceptor sewer system. This contract would be for 10 years with two potential 5-year renewals.
The contracts would replace an existing arrangement with a vendor providing similar services.
 

Existing Odor and Corrosion Control

The interceptor sewer system has odor and corrosion control equipment at 16 sites throughout the region, primarily at wastewater pumping stations (also known as lift stations). Liquid calcium nitrate is injected into the wastewater flow at these sites. Calcium nitrate is a natural compound that reduces hydrogen sulfide odors and minimizes corrosion in the system.

The liquid calcium nitrate is stored in tanks on site. Electronic control systems manage flow into the wastewater and monitor tank levels. The system may be installed inside or outside of lift stations or above or below ground at interceptor meter stations. Below are photos and diagrams of the existing systems.

Clockwise from top left, exterior tank and control at a lift station, interior tank and control at a lift station, underground tank and control at a meter station, and aboveground tank and control at a meter station.Photo 1: Collage of existing site photos.  Clockwise from top left, exterior tank and control at a lift station, interior tank and control at a lift station, underground tank and control at a meter station, and aboveground tank and control at a meter station. 
 

Diagrams


Figures 1 through 4 in PDF format
Diagram of chemical odor control system outside and above grade at a lift station. Belowground features: flow from local sewers to wet well, to the pump in the dry well, to the treatment plant.  The aboveground features, a calcium nitrate tank, odor control panel, and optional carbon air filter, are connected to the belowground wet well section.
Figure 1: Chemical Odor Control system located outside and above grade at MCES lift station
Diagram of chemical odor control system inside a lift station.  Belowground features: flow from local sewers to wet well, to the pump in the dry well, to the treatment plant.  The aboveground features, a calcium nitrate tank and odor control panel inside the lift station, and an optional carbon air filter outside the lift station, are connected to the belowground wet well section.
Figure 2: Chemical Odor Control system located within MCES lift station (if room is available)
Diagram of chemical odor control system outside a meter station, above grade.  Belowground features: flow from local sewers to the meter, then to the lift station or treatment plant.  The aboveground features, a calcium nitrate tank and odor control panel, are connected before the meter, and an optional air vent not at all locations is connected after it.
Figure 3: Chemical Odor Control system located outside and above grade at MCES meter station>
Diagram of chemical odor control system outside a meter station, below grade.  Belowground features: flow from local sewers to the meter, then to the lift station or treatment plant.  Also belowground, a calcium nitrate tank and odor control panel are connected before the meter, and an aboveground optional air vent not at all locations is connected after it.
Figure 4: Chemical Odor Control system located below grade at MCES meter station (location dependent)

 

Existing Sites

Lift stations (L) and meter stations (M) with odor control equipment or planned for near-term improvements include:

Site Location Status
L-24 4340 Highland Rd., Minnetrista Existing
L-27 402 Hiawatha Ave., Hopkins Existing
L-38 6270 Westedge Blvd., Mound Existing
L-42 2440 Porter Ave., Anoka Existing
L-59 896 Old Crystal Bay Rd. S., Orono Existing
L-60 1598 Stoneridge Cir., Long Lake Existing
L-63 1280 Poplar Ave., Maple Plain Existing
L-66 6220 125th St. W., Savage Planning
L-67 1480 South Ferry Rd., Anoka Existing
L-68 498 Maine St. S., Bayport Existing
L-70 9615 Highway 5, Laketown Township Existing
L-71 600 4th St. E., Chaska Existing
Roseville Cottontail Park, Roseville Existing
M-132 France Ave. S. and Lake St. W., St. Louis Park Existing
M-224 Cul-de-sac on 83rd Ave. N. near Highway 169, Brooklyn Park Planning
M-232 9850 Jefferson Highway N., Brooklyn Park Existing


Typical Site Activities

MCES staff activities at these sites are minimal. Operations staff remotely monitor the odor and corrosion control processes. Maintenance staff regularly check and maintain the sites as needed. Calcium nitrate storage tanks are typically refilled monthly, depending on usage, and tank levels are remotely monitored. Exterior tanks include heating elements to prevent freezing in cold weather. 
  

Public Participation

MCES wants to hear from the public and potential contractors regarding this odor and corrosion control project. MCES policies and procedures include a public hearing on long-term contracts such as this. MCES staff held two virtual public information meetings in early April 2021 followed by a virtual public hearing in late April.

 

Public Information Meetings

 

Meeting No. 1 - April 7, 2021

Included sites in Anoka, Bayport, Roseville, St. Louis Park, and Brooklyn Park.
Meeting No. 1 Presentation (PDF)

 


Meeting No. 2 - April 8, 2021

Included sites in Minnetrista, Hopkins, Mound, Orono, Long Lake, Maple Plain, Savage, Laketown Township (Waconia area), and Chaska.
Meeting No. 2 Presentation (PDF)

 


Public Hearing - April 21, 2021

Included sites: all.
Public Hearing Presentation (PDF)
 

 


 

Project Updates

Public Hearing Presentation - April 21, 2021 (PDF) 7.4 MB

Public Meeting 1 Presentation - April 7, 2021 (PDF) 7.6 MB

Public Meeting 2 Presentation - April 8, 2021 (PDF) 7.6 MB

Project Staff

Project Manager: Bob Johnson, Project Manager, Interceptor Engineering
 

Project Contacts

Please contact our project team through the project hotline or email address.

Email: info@mcesodorcontrol.org

Phone: 651.286.8462
 

Capital Improvement Program
Contact Us

    Contact project staff with questions or concerns about this project.

    Email: info@mcesodorcontrol.org

    Phone: 651.286.8462

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