Design Archives - Tata & Howard

Water Treatment Plant, Amherst, MA

amherst-wtp-exterior Tata & Howard contracted with the Town of Amherst for design, permitting, bidding, and construction administration of the 1.5 million gallon per day (MGD) Centennial Water Treatment Plant (WTP) to treat surface water from the Pelham Reservoir System. The existing Centennial WTP, located in the Town of Pelham but supplying the Amherst Public Water System, has a history of issues with turbidity, color, and disinfection byproducts in the form of total trihalomethanes (TTHM) and haloacetic acids (HAA5) because of high levels of organics in the Pelham Reservoir System. Due to the age and condition of the existing WTP, the filters which were the primary treatment process at the existing WTP were no longer effective at removing organics, leading to a decrease in finished water quality and total WTP capacity. The existing Centennial WTP has been offline since 2018 due to water quality, as well as infrastructure concerns related to a lightning strike which impacted pumping equipment and communications at the Centennial Water Treatment Plant’s raw water pump station.

Based on the results of the pilot study performed by the Town of Amherst, Tata & Howard completed design of the new Centennial Water Treatment Plant including dissolved air flotation (DAF) clarifiers and granular activated carbon (GAC) filtration for treatment of organics, color, turbidity, and low levels of iron and manganese. The DAF system includes polyaluminum chloride for coagulation, two rapid mix chambers, and three package DAF units which each include two high rate flocculation chambers, two low-rate flocculation chambers, a saturation tank, effluent collection system, discharge weir, mechanical skimmers and beach, and associated appurtenances and controls. Three dual media filter chambers with a silica sand/course garnet base layer and GAC above are located downstream of the DAF units, prior to final chemical addition.

Additional chemical feed includes a gaseous chlorine system for disinfection, gaseous ammonia for chloramine formation, sodium fluoride for dental health, and sodium hydroxide for pH adjustment and corrosion control. The new facility also includes an advanced Supervisory Control and Data Acquisition (SCADA) system for automated control of the water treatment plant. Operators for the Town of Amherst will be able to remotely monitor and control operation of the Centennial WTP, through a recently extended town fiber optic cable network.

The design of the Centennial WTP included provisions to maintain the Amherst water distribution system, as even with the Centennial WTP offline, the clearwell of the existing facility also serves to maintain pressure in a small portion of the water distribution system between the Centennial WTP and a booster pump station. The Centennial WTP feeds the majority of the water system (excluding the portion between the WTP and the booster pump station) by gravity. Since the existing WTP including the clearwell was demolished prior to construction of the new WTP, design and construction of the new WTP included temporary water storage tanks to maintain pressure and keep all connections active in the high service area of the Amherst Public Water System.

Permitting for this project included a BRP WS 24 New Treatment Plant application with MassDEP, Site Plan Review with the Pelham Zoning Board of Appeals, and a Request for Determination of Applicability (RDA) with Pelham Conservation Commission.

The Centennial Water Treatment Plant was bid and awarded to R.H. White Construction Co. of Auburn, MA for a contract amount of $18,876,000, and the project received funding though the Drinking Water State Revolving Fund program. Construction was completed and a ribbon cutting ceremony was held in October 2025.

Well Field PFAS and PCE/TCE Removal, Danbury, CT

Tata & Howard is providing design and bidding of a treatment system for PFAS and PCE/TCE removal from three groundwater wells at the Kenosia Well Field.

PCE/TCE treatment includes using two 37 ‘H air stripping tower which will discharge into the new aerator wet well. Water will then be conveyed from the wet well to the four 12’W granular activated carbon vessels for PFAS treatment. Treated water will be pumped to the West Lake Reservoir for additional treatment.

The project also includes site work, electrical, HVAC and rehabilitation of the three existing groundwater wells.

Leverett, MA Water Mains

Tata & Howard was retained by the Town of Leverett for design and permitting engineering services to expand the Amherst water distribution system into the Town of Leverett. The project involved the extension of the existing 8-inch water main in East Leverett Road, approximately 1.8 miles, to provide service to homes at the intersection of Cushman Road and Teawaddle Hill Road in Leverett with wells that have been contaminated by the Town of Leverett Landfill.

Tata & Howard reviewed available data with the Town for use in this project including existing GIS mapping, existing utilities, Town specification standards for materials and products, and boiler plate specification sections. Base plans for the project were developed utilizing the Town’s GIS data.

Borings were completed along the project route to determine existing soil conditions and the extent of rock/ledge, if any. In addition, soil borings assisted in determining the amount of needed polyethylene wrapping of the new ductile iron water main due to corrosive soils.

The design included the installation of water service connections to existing homes within the project area from the water main up to and including the curb stop at the property line. New hydrants were spaced every 500 feet and in-line gate valves were spaced no more than 1,000 feet apart. Surface preparation included temporary trench pavement and permanent trench pavement in accordance with the Town of Amherst and Town of Leverett standards. The draft design plans and specifications underwent a series of internal reviews for quality control. Tata & Howard provided the Amherst Public Works with a 50% and 90% draft for review prior to finalizing the project documents.

Sewer Feasibility Study and Sewer System Design — New Fairfield, CT

Tata & Howard completed a Sewer Feasibility Study for the Town of New Fairfield, CT to determine the feasibility of developing a sewer service area for the Town of New Fairfield town center/business district, municipal town buildings and schools, and other properties within the proposed sewer service area as well as transporting the wastewater to the City of Danbury’s Wastewater Treatment Facility. The assessment included an estimate of projected flows for all properties within the planned service area and a comparison of total estimated flows to available capacity at the Danbury Wastewater Treatment facility. Design concept plans for the planned sewer service area included determination of collection system sewers and pump station locations. Part of the study included an evaluation of potential routes for transporting flows from the Fairfield Town Center service area to the City of Danbury collection system for treatment.

Estimated project budgetary costs for the sewer service area collection system, pump stations, and transport to the City of Danbury along with a phasing and implementation plan were included in the final draft report to the Town of New Fairfield.

Throughout the course of the project, a number of meetings with the Town were held to obtain Town input and comments including one meeting at the completion of the initial assessment phase, one meeting at the completion of the concept design phase, and a series of meetings and presentations at Town Selectboard meetings to obtain public input during the roll out of the final report.

Tata & Howard provided preliminary and final design of 2.7 miles of gravity sewers, one main pump station, four remote, submersible pump stations, 2.3 miles of force mains, , and 4,000 linear feet of low pressure sewer. The project also includes identifying easements, land acquisition plans, preparation of permitting, and bidding assistance.

Preliminary design included survey, soil borings, preparation of base mapping, identification of utility requirements, a radio path survey and an opinion of probable cost.

Final design development includes final design of the main pump station, remote pump stations, gravity sewers, force main, and low-pressure sewers for connection to the City of Danbury collection system including site plans, profiles of force main and gravity sewers, pump station structures and chambers, electrical and controls, emergency generators, odor control, erosion and control plans, etc. Also includes design of the main pump station building designed to match the local aesthetic and mask it as a non-utility structure.

Construction Documents will be prepared by phasing construction under four contracts:

Year 1 – Phase 1: Main Pump Station and force main for connection to the Danbury System and Collection System for the Town Center and commercial district (Sewer Sheds 2 [commercial],
4, 5 and 8);
Year 2 – Phase 2: Collection System connecting schools, police, and fire facilities (Sewer Sheds 1 and 2 [residential]);
Year 3 – Phase 3: Additional Collection System connecting additional commercial properties, The Birches 55+ community, The Woods at Dunham Pond 55+ community, The Good Shepherd Lutheran Church, and potential future land development along Route 37 (Sewer Sheds 3, 6, and 7).

Barnstable, MA Maher WTP Upgrades

Photo courtesy of Waterline Industries Corporation

Tata & Howard provided engineering services for a completion of a pilot test proposal, pilot testing, and pilot test report to evaluate the use of granular activated carbon (GAC) to treat PFOS/PFOA, advanced oxidation to treat 1,4 dioxane, and LayneOx and greensand pressure filtration to remove iron and manganese from the source waters (Well No. 1, Well No. 2, and Well No. 3) at the existing Maher Water Treatment Plant. Pilot testing was performed, submitted, and approved by MassDEP in July 2017. The pilot test report was prepared and submitted in January 2018 to MassDEP.

Tata & Howard also provided engineering design, permitting, bidding, and construction services for the expansion of the existing Maher Water Treatment Plant. Upgrades include a new 90’ x 90’ pre-engineered metal building, GAC treatment, chemical feed upgrades, electrical upgrades at the existing plant including a new stand-by generator, and miscellaneous piping and site work. The new carbon filtration building include granular activated carbon (GAC) filters designed to remove PFAS. In addition to PFAS, the facility will include treatment processes to treat 1,4 dioxane and iron and manganese in the drinking water.

This project involved Massachusetts public construction laws and procedures.

Paxton, MA Stormwater Pipe Infrastructure

Tata & Howard provided engineering services for the design for approximately 7,000 linear feet of stormwater pipe to replace existing pipe on West Street from Pleasant Street to Mill Street in Paxton, Massachusetts.

A qualified subconsultant was retained by Tata & Howard for a topographical and planimetric survey including 2-foot contours, existing structures and utilities, existing utility easements, limits of right of ways, and other features of the work area. Tata & Howard prepared the design plan with profile views and technical specifications for construction of the project in three separate phases, as follows:

Approximately 2,300 linear feet of stormwater drain on West Street from Pleasant Street to Shanandoah Drive;
Approximately 1,700 linear feet of stormwater drain from Shanandoah Drive to Holbrook Lane; and
Approximately 3,000 linear feet of stormwater drain from Holbrook Lane to Mill Street.

Three separate bid documents were prepared to bid the project in the three separate phases.

The proposed stormwater drain pipe and mitigation measures were incorporated into the Notice of Intent that was completed for the concurrent water main replacement on West Street. The proposed stormwater drain pipe was incorporated into the Massachusetts Department of Transportation (MassDOT) permit for work within the state highway layout that was completed concurrently for the water main replacement on West Street.

Tata & Howard prepared and submitted an estimate of probable construction cost for the stormwater drain pipe at the 75% and final stage of completion to assist the Owner in obtaining Town funding.

Everett, MA Lead Service Line Replacement

Tata & Howard assisted the City of Everett, MA with their Lead Service Replacement Project from 2018-2024. Phases 1 and 2 included replacement or material confirmation of approximately 580 services between spring 2019 and fall 2022. Phase 3 of the project addressed an additional 300 services. Tata & Howard provided design, construction administration, and resident project representative services for all three phases of the project.

Design services included attending the kickoff meeting with City and reviewing existing information including tie-cards, the City’s existing GIS database that includes service material, and the City’s master list of services with service material. Each service was field verified to confirm exterior conditions. Each design phase included completion of 50% and 95% design documents, preparation of probable cost estimates, preparation of bid documents and coordination with purchasing agent, attending meetings with City, and providing recommendation to award contract to the lowest qualified bidder.

Construction Administration services for each phase included attendance at progress meetings and site visits, review of submittals, request for information, and purchasing change orders and payment applications. As-built record tie-cards were completed for each address and the master inventory of service material was updated as construction on each phase progressed.

Resident Project Representation services included full time on-site observation during construction, reviewing schedules, serving as Engineers’ liaison with Contractor, completing reports, reviewing pay apps, and issuing certification of substantial completion.

HVWP Water Distribution and Storage Improvement Project

Background

Hooksett Village Water Precinct (HVWP) Phase I Water Distribution and Storage Improvement Project is the first of three major drinking water components of the RTIA Tax Increment Financing (TIF) District economic development initiative sponsored by the Town of Hooksett. The project consisted of the construction of 1,800 linear feet of distribution system improvements in the Vista Drive area, a new 0.40 million gallon capacity glass-fused-to-steel tank, and 350 linear feet of associated transmission main from Daniel Webster Highway to Main Street.

The Precinct has been partnering with the Town, Sewer Commission, local businesses, committees, residents and area developers to encourage TIF-based infrastructure projects. TIF can be used to fund improvements that benefit the whole community by attracting new development, revitalizing blight, and/or enacting quality of life projects. This can significantly expand the tax base and provide more or easier access to services for residents with less financial impact.

Project Details

Hydraulic modeling studies completed in 2020 as part of the Precinct’s asset management program showed that distribution improvements were needed in the Vista Drive area to relieve a bottleneck that was critically restricting flow from the existing Quarry Tank and nearby wells. The Vista Drive area water main replacement/extension was listed as a Top Priority in the Precinct’s March 2021 Asset Management Plan Update. This area is the closest and primary source of water and fire protection for the TIF District, and a direct connection to the area is imperative to efficiently transmit water to the TIF District.

The Thompson Comer Tank is critical to water system hydraulics, not only for fire flow purposes but also for redundancy, emergency resiliency, and operational flexibility. It is inextricably linked to the operation of the Quarry Tank and the TIF District. Unfortunately, it had deteriorated to the point where it needed replacement. The new, slightly larger capacity replacement tank allowed the Quarry Tank to be taken offline as needed for O&M or emergencies; provide backup storage for the TIF district; allow the Quarry Tank to operate at 100% capacity; and improve overall energy efficiency by increasing off-peak operations.

Replacement of the existing Thompson Corner Tank also served as the permanent action plan to address a Significant Deficiency outlined by the New Hampshire Department of Environmental Services (NHDES) in October 2020. The deficiency identified was severe deterioration of the coating on the inside and outside of the tank. NHDES required that funding be authorized by March 2022 and a tank construction contract be awarded by October 2022.

The cost to replace the Thompson Corner tank and install the Vista Drive area water main and associated transmission main was $2,464,000 and was funded by 2021-22 NH Drinking Water & Groundwater Trust Fund (DWGTF) and NHDES American Rescue Plan Act (ARPA) Funds.

And the Winner Is…

Each fall, the Granite State Rural Water Association holds a drinking water taste test at its Annual Operator Field Day and Exhibit. In fall 2024, just after the completion of the project, HVWP had the honor of winning the contest!

Since Hooksett Village Water Precinct won the water taste test contest at Granite State Rural Water Association Operator Field Day this fall, they were able to represent New Hampshire in the National Rural Water Association’s The Great American Water Taste Test, where they won second place out of 43 systems in the National Rural Water Association’s “The Great American Water Taste Test” in Washington D. C. in February 2025. Mike Heidorn, P.G., Superintendent, represented HVWP and accepted the award.

We are very proud of the collaboration and efforts of both HVWP and the Tata & Howard team for the incredible success of our partnership.

Grafton Water District, Trinity Avenue Well Site and Pump Station

Tata & Howard provided engineering services for permitting, design, and bidding of the Trinity Avenue Pump Station at the Trinity Avenue Wellfield (new source) and provided assistance with permitting, design, and reporting to the Massachusetts Department of Environmental Protection (MassDEP) for the proposed Trinity Avenue Well site.

The property was owned by the Massachusetts Division of Fisheries and Wildlife (DFW), and the Grafton Water District swapped land with the DFW to obtain ownership and control of the Trinity Avenue site. Test wells were installed and short-term pump tests were completed on each of the wells. Based on the results of the tests, it was recommended to install a three well configuration of 18-inch x 12-inch gravel packed wells resulting in approximately 840 gallons per minute (gpm). The work under this contract included the completion of the Request for Site Exam and Pump Test Proposal for submission to MassDEP, installation and development of three (3) 18” x 12” gravel packed wells and pitless adapters, installation and development of approximately five 2-1/2” diameter observation wells, installation of two staff gages and piezometers, performing a five-day pump test, and collection and analysis of water quality.

The project also included an evaluation of alternatives for the access road including installation of a bridge or an open bottomed culvert, and Tata & Howard assisted with the preparation of permanent easements for the installation of utilities and roadway to the well site. In addition, Tata & Howard prepared and submitted an NOI to the Grafon Conservation Commission.

Design included double wythe block and interior concrete painted block with wood truss roof and asphaltic shingles. Security included chain link fence, gates, locks, intrusion alarms, and lighting. Tata & Howard also assisted with the coordination of the installation of three-phase power to site. Chemical feed at the station includes KOH for pH adjustment and chlorine gas for disinfection. Standby power was included in an outdoor enclosure. The design also included 900 feet of new 12-inch water main for 4-log removal.

Tata & Howard also provided construction administration and resident observation services.

Rehabilitation of a 130 Year Old Tank, Newton, MA

About the System

The water distribution system in the City of Newton, MA (City) serves approximately 90,000 people and includes 319 miles of water main ranging from 2-inches up to 30-inches. There is a southern pressure zone, a northern pressure zone, and three additional high service areas. All water is supplied by Massachusetts Water Resources Authority (MWRA) and the system utilizes two tanks, the Waban Hill Reservoir and the Oak Hill Tank.

Installation of the 24-inch cast iron piping in 1890

The Waban Hill Reservoir (Reservoir) is located in the Chestnut Hill area of Newton and serves the southern pressure zone. The Commonwealth Avenue Pump Station, operated by the MWRA, serves Newton’s southern pressure zone and fills the Reservoir. The Reservoir has a capacity of approximately 10 million gallons (MG) with four chambers that were built in stages: Chamber 1 was constructed in 1891, Chamber 2 in 1901, and Chambers 3 and 4 in 1917. Each chamber is approximately 2.5 MG. At the center of the reservoir is a gate chamber building that houses the influent and effluent valves and piping to each of the chambers as well as the 90-inch diameter central core standpipe.

As shown in Figure 1, there is a 24-inch diameter common inlet/outlet line that fills the interior standpipe and then overflows equally into all four chambers. When drawing, the 24-inch diameter check valve opens and draws through the effluent lines and out the common inlet/outlet. An additional 24-inch diameter inlet/outlet pipe is located in the corner of Chamber 2 that operates Chamber 2 only if needed. During construction, Chamber 2 was used to feed the system through the secondary inlet/outlet pipe while work was completed on the effluent valves for all chambers. During construction, the effluent pipe from Chamber 2 to the core was plugged so that work could be performed on the piping and valve while keeping Chamber 2 in service.

All chambers have a drain line and valve that manifold into a 24-inch diameter drain line that runs under the existing common inlet/outlet pipe. The bottom of the interior standpipe as well as the standpipe overflow both drain into the 24-inch drain line.

Design

The original scope of the repair project included rehabilitating the 90-inch diameter standpipe, replacing four 24-inch effluent valves, and replacing the asphalt shingle roof.

Prior to construction, it was important to review the impacts of removing Chambers 1, 3, and 4 from service on the distribution system. The existing hydraulic model for the City was used to evaluate pressures and available fire flow throughout the system with just Chamber 2 online. The inlet/outlet pipe for Chamber 2 runs down Commonwealth Avenue to the Pump Station (blue line in Figure 2) while the main inlet/outlet pipe from the Central Core runs down Ward Street to the Pump Station (red line in Figure 2). Changing the location of where water enters the system from the Reservoir in turn impacted the hydraulics at certain areas of the system, specifically at higher elevations north of the Reservoir. A recently installed 12-inch diameter interconnection between the two feed lines was opened, reducing the overall headloss in the system.

The design required a contingency plan, addressing potential challenges such as losing the entire Reservoir due to a water main break on the inlet/outlet pipe to Chamber 2. Through close coordination with T&H, the City, and MWRA, an emergency response plan was created that added enhanced scenarios. T&H evaluated the model for the best location of a mobile pumping unit and location of pressure relief valves. The City installed additional hydrants so the City could use MWRA’s mobile pumping unit if needed to pump from the northern pressure zone to the southern pressure zone, which required coordinating availability of equipment with MWRA.

Following a review of the challenges, the design scope was revised. Final design and bidding on the project included standpipe rehabilitation, effluent valve and piping replacement, drain valve replacement, check valve replacement, and asphalt shingle roof replacement as well as the standpipe cover and man-way, interior lighting improvements, and instrumentation.

Construction Challenges

There were many construction challenges to overcome as part of the design. Record drawings indicated an isolation valve was located on the common inlet/outlet pipe; however, the valve was unable to be found. A new valve was installed as a change order for the project.

The construction contractor was limited to light loads due to the uncertainty of the structural integrity of the roof to support specific loads, meaning no cranes or heavy equipment could be used, and spanning a crane from the access road to the gate chamber was cost prohibitive.

The existing valves were embedded in concrete and the flanges were severely deteriorated. Because of the age of the pipe, angles and bolt patterns were not easily matched with modern piping. Therefore, stainless steel piping was used to fabricate the needed angles to connect the new valves to the common inlet/outlet pipe.

The standpipe was showing signs of severe deterioration. Under recommendations from MassTank, specialty repairs were required to prolong the life of the standpipe. Steel plates were installed at the joints within the standpipe, both interior and exterior surfaces were sand blasted, a 200 mil epoxy coating was installed on the interior surfaces, and a 10 mil coating was applied to all exterior surfaces.

Initial filling of the reservoir caused Chamber 2 to fill faster than Chambers 1, 3, and 4 which caused the Commonwealth Ave. Pump Station to shut down. Therefore, the MWRA mobile pumping unit was relocated to the Waban Hill Reservoir and water was pumped from the hatch in Chamber 2 through the hatch in Chamber 1 which was connected to Chamber 3 and 4 through the central core.

Conclusion

Construction was completed in February 2024 and the project was highly successful with minimal service interruption due to a close working partnership with Tata & Howard, the City of Newton (client), and MWRA.