Sewer Mains Archives - Tata & Howard

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).

Interceptor Sewer, Danbury, CT

The Oakland Avenue sanitary sewer project consisted of jacking a 48-inch steel casing pipe through the Interstate-84 embankment in Danbury, CT and installing a new 24-inch sanitary sewer to replace the existing 16-inch sewer that is undersized. The project alleviated the restriction that is causing sewer overflows. Services included surveys and mapping, review of easements, review and updating of original design, preparation of plans and specifications, bidding, construction administration, and resident observation. The new sewer line installation will complete an interceptor project that was constructed in 1994.

Construction was completed in 2016.

Infiltration/Inflow Investigations in Milford, MA

Tata & Howard has been conducting Infiltration/Inflow (I/I) investigations for The Town of Milford, Massachusetts for the past several years within their collection system, which consists of approximately 90 miles of 4-inch diameter to 36-inch diameter gravity sewers and force main, ten pump stations and a 4.3 million gallon per day (MGD) advanced wastewater treatment facility. Throughout the investigations, I/I sources such as broken service connections, broken pipes, cracks, roots, and illegal connections have been identified. The I/I ranged from 144 gallons per day (gpd) to in excess of 400,000 gpd. Based on the results of previous I/I investigations, the Sewer Department was able to remove a direct connection from the street drainage system to the sewer system that resulted in the removal of an estimated 450,000 gpd of extraneous water from the sewer system, therefore regaining 10 percent of available capacity at the treatment facility.

As a result of conducting these I/I investigations, the Town has the ability significantly reduce the amount of extraneous water entering the collection system, as well as free up capacity at the treatment facility. The Town of Milford has also incorporated a 5:1 removal policy within the Town Bylaws, which requires Contractors/Builders to remove 5 gpd of I/I from the system for each gallon of wastewater proposed to be discharged, which minimizes repair costs for the Town and their residents.

Pump Stations, Wastewater Treatment Facility, and Force Main Design and Construction, Troy and Jay, VT

Tata & Howard provided engineering services for the evaluation, design, and construction of approximately five miles of pressure and gravity sewer to serve the mountain resort community of Jay, Vermont. The design also included the upgrade to air release structures for 4.5 miles of force main and upgrade of two pump stations, one a progressive cavity station.

In addition, Tata & Howard provided engineering services including planning, evaluation, design, permitting and construction services for the Troy-Jay wastewater treatment facility upgrade. The new headworks facility included screening and aerated grit removal and influent design for the force main/pressure sewer from the two towns and mountain resort. The treatment process was an SBR facility with tertiary filtration and UV disinfection for phosphorus removal.

CMWP, CMOM, and I/I Evaluation, Milford, MA

Tata & Howard is providing all engineering support services related to the operation of and modifications to the Town’s wastewater collection, pumping, and treatment systems including preparation of a Comprehensive Wastewater Management Plan (CWMP) and preparation of a comprehensive Infiltration/Inflow (I/I) Evaluation. In addition, we are providing all ongoing support services related to the preparation of a Capacity, Management, Operations, and Maintenance (CMOM) program to meet US EPA’s regulations as well as technical assistance on the renewal of the Town’s NPDES permit. Included in this project is the preparation of the Town’s I/I control plan and all annual updates, preparation of the Town’s sewer use regulations and standard specifications for sewer construction, review of plans for all private developments, and review of all applications for industrial wastewater connection permits and pretreatment reports.

All services related to I/I identification, evaluation, and removal performed on the Milford’s sewer system, which consists of approximately 100 miles of interceptor sewers and mains, including an innovative sump pump removal program, has resulted in a dramatic reduction in extraneous flow to the system.

Industrial Park Interceptor Sewer and Pump Station, Medway, MA

Tata & Howard conducted an alternatives analysis for the collection and disposal of the 80,000 gpd of wastewater anticipated from the Medway Industrial Park at full build out. The study included investigations of on site treatment and subsurface effluent disposal, intermunicipal connections, and/or a pump station with force main and gravity sewer to provide sewers to the Industrial Park. Upon completion of the study, Tata & Howard was retained to design a new sewer interceptor and pump station to service the industrial park.

Tata & Howard completed the design of 18,000 linear feet of 8-inch and 18-inch diameter gravity interceptor sewer and a dedicated pump station with force main to service the Medway Industrial Park. The pump station is a wet well mounted suction lift pump station with a capacity of 500 gallons per minute and it includes a dedicated standby generator with automatic transfer switch.

Sewer Improvements and Wastewater Pump Stations, Bingham, ME

Tata & Howard provided engineering services associated with sewer improvements including evaluation, design, and construction of 3,500 linear feet of interceptor sewer, 2,500 linear feet of force mains, and three pump stations. In addition, Tata & Howard provided design and construction of 5,000 linear feet of interceptor sewer, 4,000 linear feet of gravity sewer including a river crossing, and a pump station. Tata & Howard also provided design and construction services for three new wastewater pump stations. The pump station scope included upgrading of one pump station and the design of two other pump stations. One of the pump stations is a suction lift station while the other two are submersible stations.

Services: Sewer Mains