Stormwater Management: Rooftop Runoff, Whitinsville, MA

Stormwater Engineering: Whitin Wellfield Water Treatment Facility, Whitinsville, MA

stormwater rooftop runoffThe Whitin Wellfield Water Treatment Facility design consisted of a pressure filtration vessel housed within a new pre-fabricated metal building, and upgrades to the chemical feed system housed within an existing building on site. The project also included associated electrical and instrumentation, as well as site stormwater management. The design called for replacement of the existing paved driveway, but since no new impervious pavement was added, the only stormwater runoff that required treatment was the rooftop runoff from the new building. MassDEP guidelines require treatment of runoff from metal roofed buildings within the Zone II radius of a wellfield. The necessary treatment was achieved by discharging the roof runoff into a grass-lined channel. The grass-lined channel provided pre-treatment for a bioretention area, which consisted of a shallow excavation in which specially selected metal-resistant grasses and shrubs were planted within a specific soil to provide treatment. This treatment train provided the necessary total suspended solids removal but did not receive credit for infiltration, which was required by MassDEP. The biofiltration area was designed to collect, store, and infiltrate a 100-year storm event, so although the BMP train did not receive credit by MassDEP standards, the local Conservation Commission agreed that runoff would be infiltrated and therefore approved the design.

Water Storage Tank Replacement, Hamden, CT

Whitney Wintergreen tank completed
Tata & Howard provided evaluation, design, construction administration, and resident observation services to the South Central Connecticut Regional Water Authority (SCCRWA) for the replacement of the Whitney-Wintergreen water storage tank. The project included an analysis of SCCRWA’s Whitney-Wintergreen service area to determine the appropriate volume of storage needed to serve its customers, and a 1 million gallon concrete tank was constructed to replace the existing 1.5 million gallon steel tank at the same site. The project also included demolition of the existing tank as well as stormwater management at the site. The project was completed in September of 2015.


Site Stormwater Management, Falmouth, MA

Long Pond Water Treatment Plant, Falmouth, MA

FalmlouthMA_Long_PondThe Long Pond Water Treatment Plant project consists of an 8 mgd DAF treatment plant, ozone contactors, and raw water pump station with intakes. The site stormwater management part of the project was separated into two designs: the parts of the site under the Conservation Commission’s jurisdiction and those that are not.

The majority of the site from the entrance along the access road and around the main treatment plant building did not fall under the Conservation Commission’s jurisdiction, and therefore did not require stormwater treatment. However, we did not want to ignore the potential impacts of stormwater, so this portion of the site was designed to allow for 100 percent infiltration. Along the access road, grading allowed for water to discharge and infiltrate in undeveloped areas where it will not impact the site. The area around the main building flows over land to an infiltration basin that is designed to collect, store, and infiltrate most storm events. There is an overflow in the case that the infiltration basin is overwhelmed during a large storm event.

The construction of the raw water pump station and intakes fell within the Conservation Commission’s and other agencies’ jurisdiction. Since the only impervious area was the building, and the building did not have a metal roof, MassDEP guidelines allowed for direct infiltration. The guidelines usually require the infiltration to occur in drywells in this situation, but the local Conservation Commission agreed that having an infiltration basin with an overflow would require fewer man-made structures and therefore have less impact on the surrounding environment. The infiltration was designed to store and infiltrate the raw water pump station roof runoff, and included an overflow for large storms.

NPDES MS4 Annual Report Services

NPDES Phase II Small MS4 General Permit Annual Report Services

The purpose of the MS4 annual report is to document the status of NPDES Storm Water Management Program (SWMP) implementation with information including the following:

  • A self-assessment review of compliance with the permit conditions;
  • An assessment of the appropriateness of the selected BMPs;
  • An assessment of the progress towards achieving the measurable goals;
  • A summary of results of any information that has been collected and analyzed;
  • A discussion of activities for the next reporting cycle;
  • A discussion of any changes in identified BMPs or measurable goals; and
  • Reference to any reliance on another entity for achieving any measurable goal.

Tata & Howard has provided MS4 Annual Report services to the following municipalities:

DoverMA_stormwater_outfallDover, Massachusetts

Tata & Howard assists the Town of Dover, MA with MS4 compliance.  Services have included completion of the annual report, facilitation of an educational training session with municipal leaders, review and updating of stormwater infrastructure, and education on the upcoming MS4 Permit. We are currently assisting them with preparing the Notice of Intent required for coverage under the new 2016 Massachusetts MS4 General Permit.

Manchester-by-the-Sea, Massachusetts

Tata & Howard reviewed stormwater information and provided a Year 11 annual report to the Town of Manchester-by-the-Sea, MA.

Leicester, Massachusetts

Leicester_Stormwater1Tata & Howard assists the Town of Leicester, MA with MS4 compliance. Services have included creation of an IDDE program including written statement of IDDE responsibilities, outfall inspection and mapping, and educational presentation to Town leaders on illicit connections. In addition, Tata & Howard helped the Town create and pass a bylaw related to illicit connections required by the MS4 Permit and produced the MS4 Annual Report for the Town. We are currently assisting them with preparing the Notice of Intent required for coverage under the new 2016 Massachusetts MS4 General Permit. Moving forward, we will be assisting the Town with additional mapping and catchment area identification.

Site Stormwater Management, Wayland, MA

Happy Hollow Chemical Feed Station, Wayland, MA

Happy Hollow site stormwater managementThe Happy Hollow Chemical Feed Station design consisted of a small chemical feed building and equipment, well pump and water main installation, and associated utilities and site work. The only impervious surface on the site was the new building. Since building roof was a membrane and not metal and there was no paving, MassDEP guidelines allowed for direct infiltration of the stormwater runoff from the roof. This was accomplished by pitching the roof to one side and collecting the runoff into two 4” PVC drain pipes that discharged into an infiltration system consisting of four Cultec infiltration chambers. Since it was not feasible to install an overflow for these chambers, the infiltration system was designed based on a 100-year storm event in order to have the capacity to collect, store, and infiltrate the largest storms that the site could potentially encounter. The chemical feed building also housed a re-agentless chlorine analyzer that required a constant supply of sampling water and therefore produced a constant waste flow of clean water. This analyzer waste flow was also included in the sizing of the infiltration system.

Stormwater Field Engineering, Grafton, MA

Manhole coverGrafton, Massachusetts

Tata & Howard has provided the Town of Grafton, MA with extensive stormwater field engineering services. Services have included the completion of stormwater infrastructure mapping in accordance with the Massachusetts NPDES MS4 Permit, Illicit Discharge Detection and Elimination Program.  Mapping services included outfalls and interconnections, manholes, catch basins piping, and establishment of catchment areas.  Follow-up work will continue with outfall inspection, screening, and dry weather sampling.

Stormwater Site Design Engineering, MA

Stormwater Site Design Engineering Services

Initial site inspection
Initial site inspection

Marlborough, Massachusetts

Tata & Howard is currently providing engineering services for the Town of Marlborough for a redesign of the Town’s Public Works Facility.  The work includes siting new buildings on the property, stormwater management, and assisting with permitting and obtaining Conservation Commission approval of the project.

Ayer, Massachusetts

Tata & Howard provided review and assistance to the Conservation Commission on a Stormwater Report for a new subdivision, Ridge View Heights Pingry Hill Estates, in Ayer, MA.

Stormwater Engineering Services, Leicester, MA

Leicester, Massachusetts

Leicester_ma_stormwater_engineering_servicesTata & Howard provides ongoing stormwater engineering services to the Town of Leicester, Massachusetts in support of their status as a NPDES Phase II Municipal Separate Storm System (MS4) community. Work involves outfall mapping and inspection, Illicit Discharge Detection and Elimination, development of Annual Reports, and compliance with documentation and reporting components of the MS4 Permit. In addition, Tata & Howard assisted the Town of Leicester Highway Department with mapping and inspection of stormwater outfalls and produced a unique record of each outfall, including photographs. Tata & Howard also developed a report summarizing the outfall inspections.

On-Call Water Engineering Services, Franklin, NH

City of Franklin Municipal Services Department, Franklin, NH

FranklinNH_water treatment facilityTata & Howard has been assisting the City of Franklin, New Hampshire with general water engineering services since 2009. The Tata & Howard team has managed several phases of work, including the design and construction of the water treatment plant and distribution system improvements.

The first phase was the design and construction of 2,500 linear feet of water main on Hill Road to connect a new water treatment plant to the City’s distribution system.  This project also involved use of four bioretention systems to treat and manage stormwater from the roadway, and was constructed in 2010.

The second phase of our work with the City included the design and construction of two parallel 2,500 LF sections of 12-inch diameter HDPE crossings beneath the Pemigewasset River using horizontal directional drilling to transport water from the City’s Franklin Falls Well to the water treatment plant site.

Tata & Howard managed the survey and geophysical studies and prepared a Preliminary Design Report and Environmental Review documents for several phases of work.  The City’s wells are surrounded by lands controlled by the US Army Corps of Engineers, which required that we complete an extensive permitting process to secure permissions for the final design of the project.

Tata & Howard completed design, construction, permitting, and funding applications for a 1,000 gallons per minute groundwater treatment plant to remove iron and manganese from three of the City’s wells. The plant has four pressure filters containing Greensand Plus media and using sodium hypochlorite for oxidation and sodium carbonate (soda ash) for pH adjustment. This plant went online July 9, 2012.

Tata & Howard provided design services for the construction of a new prestressed concrete tank at the site of an existing tank. The existing tank was in poor condition and due to the site characteristics, it was determined that construction of the new tank on the existing foundation of the old tank would be the best option.  A second tank on the site was demolished in 2013 and a new prestressed concrete tank will be constructed in its place.

Tata & Howard is conducting a full water system analysis for the City of Franklin, New Hampshire.  Our trademarked CEP involves creating a model of all water infrastructure in the City including sources, pump stations, treatment facilities, storage facilities, transmission and distribution lines. Using our GIS modeling software, the system is calibrated based on fire flows in an attempt to accurately replicate the existing system. We then pinpoint deficiencies within the system based on a custom rating scale given to multiple criteria such as age, break history, material type, criticality and size. Recommendations are made for improvements in order of need. The study will renew both above ground and below ground assets. Funding for this study is in part from an Asset Management Planning Grant from NHDES.

CMRSWC MS4 Stormwater Services

Central Massachusetts Regional Stormwater Coalition (CMRSWC)

Click on the CMRSWC logo to visit their website.

Tata & Howard is working with communities in south-central Massachusetts under a project funded by a Community Innovation Challenge (CIC) Grant. Of more than 120 applications received, this stormwater project was one of few that was fully funded, which demonstrates the importance of the work and the value to the region. This project, which is supported by MassDEP, DCR, Blackstone River Coalition, and many others, is highly regarded in the industry. Tata & Howard moderated several workshops with participating communities to determine the most essential tasks for this project as well as the critical content of each task. Based on the needs identified by these workshops, the project includes 31 key tasks, detailed below, all of which are directly related to stormwater:

  • Stormwater Pollution Prevention Plan (SWPPP) Template
  • Develop a Methodology to Reach a Common Benchmark (Standard Operating Procedures)
  • Develop a Training DVD/CD
  • Initial Development and Ongoing Maintenance of an Educational Website
  • Develop a Sump Pump Discharge Policy, a Salt/Sand Application Decision Tree, and a Stormwater BMP Toolbox
  • Develop a Request for Proposals for General Consulting Services
  • Develop Online Database for Data Management
  • Integrate Stormwater System Mapping
  • Cost/Benefit Analysis of a Regional Stormwater Laboratory
  • Develop a Drainage Extension Approach that Mirrors Inflow Data and Priorities
  • Develop Facility-Specific Figures for Incorporation into the Stormwater Pollution Prevention Plan (SWPPP) Template
  • Illicit Discharge Detection and Elimination (IDDE) Documentation Packet
  • Purchase and Set-Up of Two Leica CS25 Vivas
  • In-The-Field Training on PeopleForms with Tablet Devices
  • Expand Year One Tasks to 17 Additional Communities
  • Expand FY 2012 Integrated Mapping with Additional Infrastructure
  • Training on Water Quality Sampling
  • Industrial Stormwater (MSGP) Review
  • Conduct Steering Committee Meetings
  • New Permit (Draft) Workshop and Comments
  • One-on-One Consulting Time
  • Stormwater Budget Analysis