Tata & Howard provided engineering services including wastewater consulting services to develop a plan for the removal of existing inflow and infiltration (I/I) from the Town of Pembroke’s sewer collection system. The purpose of this evaluation was to review pertinent available information provided by the Town, develop a draft plan of approach to reduce I/I within the system over time and as funds are appropriated, develop a prioritized schedule for further investigations of I/I, and establish a protocol for the documentation of I/I removed from the collection system.
Tata & Howard was retained by the Town of Franklin to evaluate the wastewater pump station that serves the Franklin Industrial Park. The pump station had been experiencing capacity issues and periodic overflows. The design by Tata & Howard included the replacement of two existing wastewater pumps with 350 new gpm capacity pumps with variable frequency drives. The project also included a substantial increase in the volume of the station’s wet well through the construction of additional precast concrete tanks. The work also included upgrades to the existing alarm and communications systems.
Phase I services included engineering services for bid, award, construction administration and resident observation services for approximately 6,500 linear feet of 12-inch water main and 750 linear feet of 8-inch diameter water main for a water main replacement project on Packachoag Street.
Phase II services included engineering design, bid and award, and construction administration and resident observation services for approximately 5,000 linear feet of 8-inch water main. Both phases are funded by the USDA Rural Development program.
Tata & Howard provided engineering services for the evaluation, permitting, design, and construction of five wastewater pump stations. The pump stations included a new triplex pump station with valve structure. The wastewater treatment plant upgrade was in addition to the pump stations. The other four pump stations consisted of a new, completely relocated pump station and the upgrading of three other dry pit wet pit stations to include generators and controls for telemetry. The pump station design included a plan for maintaining operations of the stations throughout construction, which was completed in the fall of 2014.
Tata & 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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Tata & Howard has been working with the Town of Hopedale, Massachusetts for a number of years on a variety of wastewater collection and treatment projects. When the Town received an administrative order to address copper and ammonia violations at the plant, they turned to Tata & Howard for assistance. We completed the design and construction of a Wastewater Treatment Facility Upgrade project which included the installation of an automated soda ash feed system and an integrated fixed film activated sludge system (IFAS). The IFAS system is an innovative biological treatment process using thousands of special carriers designed to increase total surface area for biofilm growth without expanding the plant’s footprint. The blowers were also modified to provide better control over the aeration process.
A pilot study was conducted to test the ability of various reagents to facilitate the removal of copper from the waste stream. An automated chemical addition system was designed to improve coagulation. Additionally, a dynamic tangential filter was incorporated into the upgrade project. These improvements have allowed the Town to now meet its discharge limits for ammonia and copper.
Tata & Howard provided water and wastewater engineering services associated with the update of existing water and sewer system models using InfoWater and InfoSewer computer programs; review of the impact of proposed developments and proposed extensions to the City’s systems; verification of the hydraulic models for the City of Goodyear’s water distribution and wastewater collection systems. The water model included fire flow testing, C-value tests and calibration of the InfoWater hydraulic model. The wastewater collection system model included installation of six flow monitoring stations in three sub-basins, calibration of the model, development of a cost allocation model, and preparation of a technical report.
Tata & Howard prepared a facilities plan for the Corgett Water Reclamation Facility. The plan addressed the need for process redundancy and recommended improvements for increased flows and Class A+ effluent. Provided ongoing support services to address operational needs and to assess the impact of new developments on the system. Provided design, bidding, construction administration, resident observation, and construction services associated with improvements to the Corgett WRF including: filter system, low lift pump station, modifications to the sand filter, and instrumentation upgrades.
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Town of Spencer, MA
Tata & Howard provided 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.
Tata & Howard first assisted the District with responses to the Water Supply Division Sanitary Survey and then developed alternatives for the long term plan that would address all of the deficiencies and meet compliance with the Federal and State drinking water rules.
The issues were as follows:
- Wooden roof over concrete storage tank
- Inadequate disinfection system and metering of source
- Inadequate system pressures at the highest points within the system
- Water losses
- Inadequate metering of sources of supply to the storage tank
- Inadequate distribution piping for fire flows.
The solutions developed were as follows:
- Design and installation of concrete precast cover on storage tank
- Design of new building at storage tank with flow measurement and disinfection and better storage tank access for cleaning
- Virtual abandonment of auxiliary springs and surface water emergency source
- Design of water main replacement to meet required system pressures for compliance with the drinking water standards and rules
- Locating, permitting and developing a new source of supply (well) to supplement the existing wells and virtually eliminate the old spring sources due to the potential for contamination that had occurred in the past.
- Securing the maximum amount of grant funding available to the District at 45% with the remainder a low interest loan.
Burke Fire District #1, East Burke, Vermont
Tata & Howard worked with the District and assisted them to come into compliance with the deficiencies noted in their Sanitary Survey. This District was once a private water company with numerous water quality, pressure, and supply issues and it finally was turned into a Fire District. The system has 45 connections and is on a water connection ban from the State. Tata & Howard prepared a Water Supply Feasibility Study with regards to addressing all of the systems issues, which are noted below:
- Issues with the spring source and its spring house structure
- Issues with inadequate system pressure at a few connections
- No disinfection system or stand by disinfection system
- Lack of source metering
- Lack of source overflow metering
- Lack of auxiliary well approval
- Lack of system flushing hydrants
- Lack of good water system map
- Inadequate supply during summer months due to reduction in spring source
- Failed coliform tests requiring disinfection
The solutions developed included the following:
- New spring house roof and structure for disinfecting
- Computer modeling for alternatives to address inadequate flows and pressures
- Evaluation of the emergency well with Hoffer Consulting
- Development of a source metering vault and system
- Disinfection system for stand-by disinfection
- Plan for metering the spring overflow
- Alternatives for water system storage
- Alternative to connection to other water system source
- Flushing hydrants installation options
