Wastewater Treatment Facility Design, Upgrades, Bid, and Construction Administration, Dexter, ME

Dexter Utility District, Dexter, ME

DexterME_wastewater treatment facilityTata & Howard team members provided engineering services to The Dexter Utility District to evaluate their existing wastewater treatment facility and to provide wastewater treatment facility design. It was recommended that a phased approach to upgrade the facility be utilized in order to reduce the initial impact on the sewer user rates. The first phase of the improvements combined improvements which would improve the reliability and obtain energy savings with cleaning and disposing of sludge for the first time from their 25 year old facility. This approach allowed for a grant loan financing package to be utilized. The first phase facility upgrade included replacing a leaking single air header main with two individual air headers, replacing course bubble diffusers with fine bubble membrane diffusers, replacing three 25 year old blowers with new blowers with variable speed drives. The speed of the new blowers is controlled by a PID loop using dissolved oxygen analyzers, to maintain optimum treatment and minimize energy consumption. These improvements have reduced the energy consumption at the wastewater treatment facility by more than 50 percent.

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Water Storage Tank, Booster Pump Station, New Water Main, and Distribution System Upgrades, Spencer, MA

Town of Spencer, MA

SpencerMA water mainTata & Howard is currently providing construction administration services for a new 0.5 million gallon cast-in-place concrete water storage tank, booster pump station, approximately 12,600 linear feet of new 12-inch diameter water main, and miscellaneous distribution system upgrades. Construction of in-line isolation valves, removal of existing pressure-reducing valve (PRV) vaults, a new system wide SCADA system and new high lift pumps at the water treatment facility and well site were also included in Tata & Howard’s design. The purpose of this project is to separate the current single zone system into two pressure zones as required by an Administrative Consent Order from the MassDEP.

The creation of a two pressure zone system requires the replacement of the existing 200 horsepower (hp) pump at the Meadow Road Water Treatment Facility and 150 hp pump at the Cranberry Brook Well with lower head, high efficiency pumps and motors. The Meadow Road facility is the Town’s primary water supply source; therefore, changing of this pump requires coordination with the Department of Utilities and Facilities and the overall two pressure zone project construction sequencing to minimize the time this source is off-line.

Tata & Howard also verified the Town’s hydraulic model, which was used to select the best location for the new tank and select water main size for transmission and fire protection.  The model was also used to determine the boundary line between the two pressure zones.  A Capital Efficiency Plan™ is currently being prepared.  Assistance will be provided, as needed, for public education of the project and during Town meetings.  This project is being funded by the American Recovery and Reinvestment Act through the Massachusetts State Revolving Fund (SRF).  Due to an aggressive schedule required under the funding requirements, all design; permitting associated with planning, zoning, and wetlands; and project bidding were completed and approved within a six-month period.

Water Main, Pump Station, and Storage Tank, Athol, MA

AtholMA_tank_constructionAthol Economic Development, Athol, MA

Tata & Howard provided engineering services for a water main, pump station, and storage tank for Athol Economic Development. The project specifically included the design of a new booster pump station with a chlorine injection system, emergency generator, and SCADA, approximately 3,800 linear feet of 12-inch diameter water main, and a new 210,000 gallon elevated water storage tank on Templeton Road.  This project is an extension to the existing water distribution system and was designed to serve an area of commercial development, including a Market Basket, along Route 2A.