Maher Water Treatment Plant – Groundbreaking Ceremony

On Wednesday, August 7, the Hyannis Water System and officials from MassDEP held a ceremonial groundbreaking for construction of the new Maher Water Treatment Plant designed by Tata & Howard, Inc.

The $12 million water system upgrade, funded by the MassDEP SRF program, will enable the Town to meet new and stricter federal and state regulations for emerging contaminants. The new plant will treat elevated levels of Perfluorooctanoic acid (PFOA), perfluorooctane sulfonate (PFOS), 1,4-Dioxane, iron, and manganese in the three drinking water production wells at the existing facility.

The water filtration building at the Maher Water Treatment Plant has a design capacity of 1,500 gallons per minute. Using granular activated carbon filtration, the successful removal of PFOS/PFOA will be obtained.  Advanced oxidation with peroxide and ultraviolent (UV) light will treat 1,4-Dioxane. Lastly, greensand pressure filtration will not only remove the iron and manganese, but also extend the useful life of the granular activated carbon.

Tata & Howard has been instrumental in the evolution of this project. In December of 2016, Tata & Howard provided a conceptual design report to Barnstable’s Department of Public Works. A pilot test report was submitted in early 2018 and design began shortly thereafter.

The Hyannis Water System currently consists of four water treatment facilities, four storage tanks, 12 well pumping stations, and a 107-mile distribution system. The water system provides drinking water services to approximately 18,000 residents through 7,249 metered service connections to residential and commercial properties. Supplying its drinking water from groundwater sources, the Hyannis Water System draws about 2.77 million gallons per day from wells.

Construction is scheduled to begin immediately and will follow an accelerated schedule for completion. The plant is expected to be operational by the fall of 2021. Waterline Industries Corporation of Seabrook, NH will be constructing the filtration building, and Tata & Howard will provide construction administration and resident observation.

Newton, MA – Lead Service Replacement Program

Tata & Howard was contracted to provide design, construction administration and resident project representation for the replacement of 588 lead services in Newton, MA.

Although the water that services the City is not corrosive, replacing lead services is a cautious and preventative measure to avoid lead from potentially leaching into tap water via the service connection which is located from the water main to the meter.

Lead pipes are more likely to be found in older cities and homes built before 1986. As such, the affected lead services in Newton were installed between 1875 and 1915.

Of the 588 total services;

  • 318 were full-service replacements (from water main to meter)
  • 266 were partial-service replacements (from curb stop to meter)
  • 4 were street only replacements (from water main to curb stop)

Prior to the construction phase of this project, Newton residents were notified about the City’s Lead Service Replacement Program (LSRP). Although not required, those wishing to participate in the program were able to take advantage of a ten-year, no interest payment plan through the City.

Under the LSRP, the City replaced, at its own expense, the portion of the water service pipe which was within the public way from the street line in front of the homeowner’s property, to the City water main. The homeowner then had the option to replace the portion of the water service pipe that ran from their meter to the property line.

Tata & Howard scheduled construction and coordinated with the residents who elected to participate in the LSRP. Crews from C.J.P & Sons Construction worked to excavate the properties and remove/replace the water service pipes. In most cases, limited excavation of homeowner property was needed.

When the project reached completion, 427 total services had been replaced.

Lead service replacement program in Newton, MA. Excavator and men.

Lead service replacement program in Newton, MA. Newton home with construction cones.

Lead service replacement program in Newton, MA. Excavator and men. Construction worker replacing pipes.

Lead service replacement program in Newton, MA. Sidewalk closed sign,

(De)leading the Way – Marlborough, MA

The City of Marlborough, MA (home of T&H headquarters) contracted Tata & Howard for the design, pre-construction services, construction administration and resident observation of approximately 1,200 lead water service connections.

Until 1944, lead was widely used in service lines and is quite common in many of the older cities and towns in Massachusetts.

Lead pipes currently placed between the streets and homes of identified Marlborough residents will be replaced with copper pipes in five phases – each phase consisting of approximately 250 homes.

Tata & Howard will be involved in each phase, reviewing tie cards, attending field surveys to determine what each service placement will entail, and advising contractors on the quantity of pipes to be installed in each location.

Although lead is known to be  a major health risk to children and pregnant women, the supplier of Marlborough’s water, Massachusetts Water Resources Authority (MWRA), treats all water to reduce lead from getting into drinking water.

   

   

Falmouth Main Street Water Main Construction

Tata & Howard was contracted to provide design, construction administration and resident observation for the installation of 18,000 linear feet (approximately 3.5 miles) of 16-inch ductile iron water main in Falmouth, MA. Water main replacement will be in Main Street and Route 28. That is, from the intersection of West Main Street and Locust Street, to the intersection of Teaticket Highway and Oxbow Road.

New water main will be replacing the town’s 10-inch cast iron water pipes that were originally installed in 1898. Falmouth’s 121-year-old water infrastructure has stood strong for more than a century; however, it has become clear that it’s nearing the end of its useful life and approaching the age at which it needs to be replaced. Evidence of this can be seen in the three water main breaks that have occurred since August of 2018. In addition, the original water main is hydraulically deficient and needs to be up-sized to meet the increasing demands in the system.

Construction began at the beginning of April and continued up until Memorial Day of this year. Construction was placed on hold during the heavy tourist months in Cape Cod and will resume after Labor Day. Project completion is expected in 2021.

 

Hemlocks Raw Water Pumping Station

Aquarion Water Company Pump Station Improvements

Hemlocks Pumps
BEFORE improvements to the Hemlocks Pumping Station.

Tata & Howard provided engineering services for design, bidding, construction administration, and resident observation to Aquarion Water Company for improvements to their existing Hemlocks Raw Water Pumping Station in Fairfield, CT. The project included refurbishing five 300 hp centrifugal pumps and motors, replacing the existing variable frequency drives (VFDs), installing new piping, check valves, and strainers for each pump.

As this facility is a source of supply for Aquarion’s Main System, it needed to be kept operational throughout the construction. The sequence of work required a single pump to be taken off line; refurbished; reinstalled with new piping, VFD, and appurtenances; tested and placed back into service prior to the next pump being taken off line.

Hemlock Pumps
AFTER improvements to the Hemlocks Pumping Station.

Another important aspect of the project was to replace the existing strainers so that they were easier for the plant operators to clean as they get clogged with eels. To simplify maintenance, new stainless steel wye strainers with bottom access to the screens were installed on the suction side of each pump.

Chamberlain Highway Receives New Water Main Connections

The Chamberlain Highway in Meridan, Connecticut has 536 linear feet of new 16-inch ductile iron main and two new fire hydrants. After Tata & Howard completed several test pits to verify connection locations at each end of the new main, construction work started on May 3, 2018 with the installation of a 16” x 16” tapping sleeve and valve at the north end of the project. This existing water main at the north end connection was originally installed in 1894.

Chamberlain West MainWork progressed south until the new main was approximately 50 feet away from the other connection point in West Main Street. Connections to the existing main in West Main Street was performed over a 36-hour period due to the complexity and amount of utilities around the service connection, including a live 24-inch water main five feet away and multiple telephone conduits located 6 inches above the replaced main. Tata & Howard personnel on site at all times to observe that work was in performed in accordance to the plans and specifications.

Following the completion of the Chamberlain Highway water infrastructure improvement project, work to replace two water mains on the state-owned bridge crossing Sodom Brook in Meridan will begin.

UMASS Amherst Hydraulic Modeling

Tata & Howard developed an extensive hydraulic model of the University of Massachusetts (UMass) Amherst campus. The model was verified under steady state and an extended period simulation (EPS) was completed.  Tata & Howard conducted a hydraulic review and criticality assessment and used the results to make improvement recommendations.  Tata & Howard also identified water distribution system sustainability projects for the irrigation, cooling tower makeup, and toilet flushing water.

This project included a supplemental water supply system analysis.  Potential ground and surface water sources on campus, including existing and potentially new stormwater retention ponds, were evaluated for process and irrigation water.  In addition, Tata & Howard created a hydraulic model of the UMass reclaimed water system.

The study also examined the effects that the proposed system improvements and interconnections would have on water quality.

A Decade of Infrastructure Improvements

Wiscasset Completes Capital Efficiency Plan™ Infrastructure Improvements

The Wiscasset Water District (WWD) completed its final phase of water main replacements for the Town of Wiscasset, ME. In 2007, Wiscasset, a rural coastal town in Maine, embarked on a long-awaited infrastructure improvement program to replace the Town’s century-old waterlines. The Wiscasset Water District, engaged Tata & Howard’s services in 2010, to prepare a Capital Efficiency Plan™ (CEP), to identify areas to the Town’s water distribution system needing rehabilitation, repair, and/or replacement.

CEP reportThe Capital Efficiency Plan™ report which included hydraulic modeling, system criticality, and an asset management plan, provided the Utility with a database and Geographic Information System (GIS) representation for each pipe segment within their underground piping system. The CEP report also prioritized the water distribution system piping improvements and provided estimated costs to replace or rehabilitate the water mains.

Wiscasset Main StreetIn response to the CEP™ findings, the Wiscasset Water District retained the services of Tata & Howard, to perform design, bidding, construction administration, and resident project representation services for a series of water main projects.

Phased over 10 years, the plan included replacing 33,150 feet of 12-inch and 8-inch piping, installation of a water storage tank mixer, SCADA upgrades, and office landscaping improvements.

The final phase of water main replacements is scheduled to be completed during the summer of 2018 and will fulfill all the Priority I water main improvements identified in the 2010 CEP™ report. The projects were funded in part by a combination of USDA Rural Development grants (6 total) and loans (7 total), as well as coordination with the Maine Department of Transportation and Rural Development.

With the water main improvements nearing completion, the Wiscasset Water District has retained Tata & Howard to reevaluate its 2010 Capital Efficiency Plan™. The revised plan will update the water main inventory database and review additional recommended water distribution improvements.

Unidirectional Flushing Program, Wayland, MA

Wayland Zone MapTata & Howard prepared a sequential Unidirectional Flushing Plan (UDF) for the Town of Wayland’s water distribution system, utilizing the existing hydraulic model to develop flushing sequences for hydrants and valves to be operated.  The sequences were updated from the original plan to review anticipated flushing velocities and identify areas of potential low-pressure concerns. Field assistance was provided during the implementation of the updated plan. A summary report was provided, identifying the amount of water used during flushing, areas of hydrant or valve mapping discrepancies, and areas with broken or inoperable hydrants and valves.

Extended Period Simulation and Hydraulic Study for Town of Avon, MA Water Division

Tata & Howard completed an Extended Period Simulation (EPS) hydraulic model of the water distribution system for the Town of Avon, Massachusetts. An EPS model was created to account for changes in the water distribution system over an extended period to include peak and minimum demands during both the summer and winter months. These changes included tank levels, pump controls, value operation, and demand variations.

The EPS model was used to estimate the water age in the water distribution system under winter and summer demand conditions. Water age is the time water takes to travel from a water supply source to a point within the distribution system.  It is used as an indicator of water quality based on the assumption that the older the water is, the greater the likelihood that water quality has deteriorated.  According to MassDEP Finished Water Storage Guidelines, a three to five-day complete water turnover is recommended in water storage tanks.

The EPS model was also utilized to evaluate the Town’s existing system operations. The model was used to determine the optimal tank operating range and the impact of the run times on the well pumps. Simulations were performed on both the Center Street and Page Street Tanks to evaluate operations under existing and projected average day demand (ADD), maximum day demand (MDD), and peak hour demands with a minimum pressure of 35 psi maintained throughout the distribution system.

In addition to analyzing the tank optimal operating levels, changes to the existing pump operations and the effect on tank levels and water age were evaluated. Two modified pump operations scenarios were evaluated. Both scenarios were run with the existing tank water level controls and allowing the Page Street Tank to drop four feet.  A second modified pump operation scenario evaluated the Town’s lead/lag system. Results for the pump and tank level operations under these simulations were recorded for both summer and winter operations.

Based on the results from each operational modification, Tata & Howard made several recommendations for improvement to the water distribution system. These included allowing the water level in the Page Street and Central Street tanks to drop an additional six feet to improve water age during both the summer and winter demands.

In addition, to help improve the water age in the tanks to an optimal three to five-day complete water turnover as recommended by MassDEP Finished Water Storage Guidelines, Tata & Howard suggested installing mixing systems in each tank.