Trinity Ave. Chemical Feed Pump Station, Grafton, MA

Tata & Howard provided engineering services for permitting, design, and bidding of the 1.3 mgd chemical injection Trinity Avenue Pump Station at the Trinity Avenue Wellfield.  The project included an evaluation of alternatives for the access road including installation of a bridge or an open bottomed culvert; assistance with the preparation of permanent easements for the installation of utilities and roadway to the well site; preparation and submittal of an NOI to the Grafton Conservation Commission.  The design included an access road, bailey bridge with abutments, double wythe block building, interior concrete painted block with wood truss roof and asphaltic shingles, installation of three (3) submersible pumps and pitless adaptors, approximately 1,800 linear feet of 6-inch and 12-inch water main, emergency liquid propane tanks and generator, instrumentation and controls, a SCADA system for the pump station and wells, and a 24-inch transmission main for 4-log removal. Security included chain link fence, gates, locks, intrusion alarms, and lighting.  Tata & Howard also assisted Owner 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 project is currently under construction and is expected to be completed by the end of 2017.

Hazardous Waste Services, Newton Centre, MA

Newton Centre soil gas plot dueling dry cleanersTata & Howard has completed a variety of hazardous waste services for a private client in Newton Centre, MA. Work included completion of the Immediate Response Action (IRA) Completion Report and Response Action Outcome (RAO) as well as obtaining indoor air samples and submitting the results to the Department of Environmental Protection (DEP) every two years. Tata & Howard also prepared and submitted Post Class-C RAO Status Reports. This involves documenting the operational status of the sub-slab depressurization systems (SSDSs) and obtaining and analyzing groundwater from three key wells to evaluate whether conditions have changed. The Status Reports are required every six months.

In addition, Tata & Howard completed the installation of a telemetry system, preparation of an Activity and Use Limitation (AUL), preparation of a Permanent Solution with Conditions (PSC) report, annual inspection of the sub slab depressurization systems (SSDSs), and the replacement of a monitoring well cover. The work included updating the existing SSDSs in accordance with anticipated revisions to the MCP by adding an alarm system designed by Tata & Howard equipped with remote telemetry able to notify the the consultant, clients, tenants, and MassDEP in the event of a system failure. The work also included a metes and bounds land survey.

Tata & Howard also performed work to comply with the revised Massachusetts Contingency Plan (MCP) and developing the data necessary to support a Permanent Solution for the release of chlorinated solvents at the Site. The work included the installation of five additional soil gas monitoring points at the Site and the collection of the data. These points were required to collect additional soil gas data to evaluate whether vapor migration has been controlled. The samples were submitted for laboratory analyses. Also, Tata & Howard collected groundwater samples from seven key monitoring wells using low flow sampling. The groundwater from the wells were measured for pH, temperature, dissolved oxygen (DO), oxidation-reduction potential (ORP), specific conductance, and turbidity. This project is ongoing.

Water System Operations Plan, Falmouth, MA

Falmouth, MA

Falmouth MA lighthouseTata & Howard, Inc. prepared a Water System Operations Plan for the Falmouth water system.  As part of the Settlement Agreement between the Town of Falmouth and the Commonwealth of Massachusetts, the Town agreed to complete a Water System Operations Plan.  The purpose of the plan was to evaluate seasonal demands, current source and storage tank operations and identify system and operational changes necessary to address distribution areas with low chlorine residuals.

The Town of Falmouth’s water distribution system consists of approximately 400 miles of water mains of various materials ranging in size from six to 24 inches in diameter.  The Town has five active water supply sources including both groundwater and a currently unfiltered surface supply. Each source is treated with sodium hypochlorite for disinfection with the exception of Long Pond, which includes disinfection with chlorine gas.  Falmouth’s water distribution system includes four water storage tanks and a Supervisory Control and Data Acquisition (SCADA) system to run and monitor operations.

The Falmouth Water Department faced a number of challenges, including the following:

  • Maintaining regulatory compliance
  • Meeting water demands
  • Peak summer demands could only be met with Long Pond surface supply
  • Long Pond is an unfiltered surface water supply
  • Constant struggle to maintain treatment compliance and water quality
  • Seasonal impacts from turnover or algae growth
  • Lack of treatment to address taste, odor, and color can require severe curtailment in use of the supply
  • Excessive source chlorine residuals needed to maintain distribution system residual chlorine concentrations, combined with source water organics results in elevated disinfection by-products (DBP – Total Trihalomethanes and Haloacetic Acids) which are regulated compounds

The study reviewed the challenges above and recommended changes to systems operations procedures to improve water quality.  We used a hydraulic model to determine water age and look at its impacts on water quality.  The plan was submitted and approved by Mass DEP.

Additionally, Tata & Howard completed the design of a 3.6 mgd treatment facility which utilizes air stripping and pressure filtration technology for the removal of iron, manganese and volatile organic compounds (VOCs). The facility includes an air stripping tower, three greensand filtration units, horizontal carbon contactors, chemical storage and feed facilities, gravel pack supply well, finished water storage, and backwash holding tanks.

Water Supply Feasibility Study, East Burke, VT

Burke Fire District #1, East Burke, Vermont 

east burke vt mountainTata & Howard has been working with the District assisting 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