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This Solicitation opportunity from Maryland was posted on June 1, 2026. The submission period has ended. Browse the details below for market research, or find similar active opportunities.

Aerated Sludge Holding Tanks

Closed
26-041State & Local

Contract Overview

Solicitation details, issuing organization, response deadlines, documents, and interested companies for this government contract opportunity.

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NAICS: 237990
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The Charles County Government, through its DPW - Capital Project Management division, is soliciting design services for critical upgrades to the Aerated Sludge Holding Tanks at the Mattawoman Wastewater Treatment Plant, which serves portions of Charles and Prince George’s Counties. The existing tanks, originally designed as aerobic digesters, currently function as flow equalization units and lack sufficient capacity to meet the county’s requirement for three days of storage at the plant’s 20 million gallons per day average daily flow. The project requires a qualified, multi-disciplined engineering firm to deliver fully permitted, bid-ready design documents and construction engineering services to reconfigure and expand the tank system to achieve this capacity target. Key technical upgrades include replacing existing blowers with new positive displacement blowers, installing a CAMix aeration system, repurposing Tank 2 for scum storage and Tank 5 for thickened sludge, installing a new digested sludge pump, applying self-priming polyurethane coatings for structural integrity, and integrating new controls and sensors into the SCADA system. All design work must comply with county specifications and include acquisition of necessary permits, development of construction documents, and oversight through the construction phase. The contract is structured into three main phases—Design, Bid, and Construction—with separate pricing for each, and includes a $150,000 design contingency and allowances for test pits and a topographic survey. The solicitation, numbered 26-041, is open to electronic submission only via the OpenGov Procurement portal, with proposals due by July 13, 2026, and must be accompanied by technical documentation on SF330 forms and a separate cost proposal with all pricing rounded to the nearest cent and inclusive of overhead, profit, and transportation. Proposals must demonstrate proven experience with at least four to five similar wastewater treatment projects over the past ten years, including one completed aerated sludge holding tank design of similar scale and another constructed project with a total cost exceeding $10 million. The award will be based on a weighted evaluation of price (40%), key staff experience (30%), project understanding (15%), and firm capability (15%), with no guarantee of award to the lowest bidder. Contractors must provide performance and payment bonds, labor and materials bonds, and carry insurance including $5 million umbrella coverage, $2 million environmental liability, $1 million pollution liability, and cyber insurance with $1 million per occurrence limits, along with professional liability coverage

General Info

Upgrade Mattawoman Wastewater Plant tanks for increased storage, operational capacity, and compliance by 2026.

Agency

Maryland → DPW - Capital Project ManagementView Agency

NAICS

237990 - Other Heavy and Civil Engineering ConstructionView NAICS

Place of Performance

MD, USA

Set-Aside

NONE

Documents

(7)

Sample Contract - Consecutive Number of Days Specified

PDFcontract-document

Performance and Labor Bonds for Charles County ITB

PDFbond

Charles County Aerated Sludge Holding Tanks RFP 26-041

PDFrfp

Project Close Out Documents - Charles County

PDFcloseout-documents

Appendix D Recommended Configuration

PDFother

Special Provisions for MWWTP Aerated Sludge Holding Tank Improvements

DOCXspecial-provisions

Formal Procurement Request Form - MWWTP Aerated Sludge Holding Tanks v4

PDFformal-procurement-request

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Timeline

PhaseClosed
Posted

Solicitation

Response Deadline

Deadline has passed

Submission Closed

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Organization & Contact Information

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AgencyMaryland → DPW - Capital Project Management
Contacts2 people available
OfficeLa Plata, MD, 20646, USA
Organization / Agency
Maryland → DPW - Capital Project Management
View Agency Profile
Office AddressLa Plata, MD, 20646, USA
Contacts
Jorge DominguezProject Manager
Catherine ScottSenior Procurement Specialist

Interested Companies (2)

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Aquafin
Elkton, MD

Full Description

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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.

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Same awarding agency

NAICS: 236220
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Department of Public Works Utilities Waldorf Regional Facility
Solicitation # 27-006
The Department of Public Works Utilities Waldorf Regional Facility project, solicitation 27-006, involves architectural, engineering, and site development design services for a 10-acre site in Waldorf, Maryland. The scope includes the partial demolition of a 63,000 square foot warehouse and the construction of a new pre-fabricated metal building integrated into the remaining structure to create a modern, multi-use operational and office complex. The facility will primarily house DPW Utilities staff and include site features such as a fueling station, salt barn, gravel storage, and parking. The project aims to enhance emergency responsiveness and service delivery by positioning the workforce within the primary population district. The contract requires the consultant to provide a Maryland licensed professional engineer as the Project Manager and adhere to a design schedule running from December 2026 through July 2028. Key deliverables include a Phase II Environmental Site Assessment, geotechnical reports, and complete permitted design documents. Qualified offerors must have been in business for at least ten years and provide three representative projects completed within the last seven years. Payment is structured through a combination of lump sum fees for design services and hourly rates for construction bidding and inspection phases. The construction phase is estimated to last 550 calendar days, with mandatory SLBE and MWBE subcontractor participation goals established by the County.
Commercial and Institutional Building Construction

POSTED

26 days ago

DEADLINE

in 18 days
View Details

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