Aerated Sludge Holding Tanks

Location:	Maryland
Posted:	Jun 1, 2026
Due:	Jul 13, 2026
Agency:	Charles County
Type of Government:	State & Local
Category:	Z - Maintenance, Repair or Alteration of Real Property
Publication URL:	To access bid details, please log in.

Project ID:

Title: Aerated Sludge Holding Tanks

Addenda: 0

Release Date: 6/1/2026

Due Date: 7/13/2026

RFP

DPW - Capital Project Management

47101538 , 81101527

Project ID: 26-041

Release Date: Monday, June 1, 2026

· Due Date: Monday, July 13, 2026 11:00am

Posted Monday, June 1, 2026 9:06am

All dates & times in Eastern Time

Draft Response Events RSVP No Bid41 days, 13 hours, 36 minutes

Post Information

Posted At:Mon, Jun 1, 2026 9:06 AM
Sealed Bid Process:Yes (Bids Sealed / Pricing Sealed)
Private Bid:No

Overview

Summary

The Board of Commissioners for Charles County seeks qualified contractors to prepare contract drawings and specifications, obtain all applicable permits, and provide construction engineering services for the proposed upgrades of the Aerated Sludge Holding Tanks. This initiative is in direct response to the County’s need for their aerated sludge holding tanks to achieve three days of storage at 20 MGD ADF. The proposed improvements aim to achieve this goal ensuring the plant’s readiness for future growth and environmental compliance.

Background

The Mattawoman Wastewater Treatment Plant (MWWTP) was constructed in the mid-1970s and currently serves the northern portion of Charles County and a southern portion of Prince George’s County. The MWWTP is rated for an average daily flow of 20 million gallons per day (MGD). The MWWTP is undergoing essential upgrades to its aerated sludge holding tanks. The tanks, originally constructed as aerobic digester tanks, currently function as aerated sludge holding tanks to provide flow equalization upstream of the dewatering facility rather than volatile solids reduction through aerobic digestion.
The existing Aerated Sludge Holding Tanks do not meet the County’s need for three days of storage capacity at 20 MGD ADF. This project aims to design upgrades for the Aerated Sludge Holding Tanks that will increase tank capacity to achieve this goal.

Timeline

Release Project Date:

June 1, 2026

Pre-Proposal Meeting Registration Deadline:

June 16, 2026, 11:00am

Firms must register in advance to attend the pre-proposal meeting via the County's eProcurement Portal RSVP Manager.

Pre-proposal meeting will occur virtually/teleconference, unless otherwise specified. Firms that have registered timely will receive participation instructions.

If multiple attendees from your firm will be attending the meeting, please have each individual complete the eProcurement Portal RSVP Manager process.

Pre-Proposal Meeting (Non-Mandatory):

June 17, 2026, 11:00am

Pre-proposal meeting will occur virtually/teleconference, unless otherwise specified. Firms that register timely and via the County's eProcurement Portal RSVP Manager will receive participation instructions.

The attendance roster will be published on the County's eProcurement Portal.

Site Visit:

June 18, 2026, 10:00am

Firms must register in advance to attend the site visit. Due to safety restrictions at the site, all visitors proceeding to the site location are recommended to wear steel-toed shoes/boots during the site visit portion of the meeting. The attendance roster will be published on the County's eProcurement Portal.

The site visit address is:

Mattawoman Wastewater Treatment Plant
5310 Hawthorne Road
La Plata, MD 20646

Question Submission Deadline:

June 26, 2026, 11:00am

Proposal Submission Deadline:

July 13, 2026, 11:00am

Aerated Sludge Holding Tanks

See also