MONTGOMERY COUNTY, OHIO, USA. SEWER UPGRADE

Woolpert Consultants were engineers for schemes to upsize and rehabilitate sewer systems in the Moraine and Holes Creek areas of Dayton, Ohio. Jason Consultants were retained by Woolpert to assist in the design of replacement installations in this well developed and sensitive residential area where damage and disruption that would be created by traditional methods would be unacceptable. Some 15 kilometres of new and replacement sewers was to be installed using trenchless methods.

Client: Woolpert Consultants
For: Montgomery County, Ohio
Key Jason Personnel: James Thomson, Andy Robinson,

DUBAI SEWER REHABILITATION. UNITED ARAB EMIRATES

Dubai Municipality retained Jason Consultants to advise them on the extensive sewer rehabilitation works to be undertaken in Dubai. Many of the original sewer pipes had deteriorated badly and required replacement. Our work involved reviewing methods of rehabilitation and installation as proposed by several groups of consulting engineers. In total there were several thousand metres of sewers to be rehabilitated. Our work included a detailed review of new installation by microtunnelling, on-line replacement by bursting and renovation by various forms of lining.

Client: Dubai Municipality
Key Jason Personnel: James Thomson.

CITY OF MONTREAL REHABILITATION TRIALS

The City of Montreal was keen to explore the options available to it through rehabilitation of its water mains and sewers. To this end it has established a series of comprehensive trials in the city, involving 3 water main renovation techniques and 6 sewer renovation techniques, to obtain data on the performance of these techniques and to compare and contrast their advantages and disadvantages and their suitability in particular situations.

Jason Consultants, together with Canadian consultants Groupe Séguin, were commissioned to prepare full technical specifications for the installation and monitoring of the rehabilitation works which were carried out over a 3-year period.

Client: Le Group Séguin, Montreal, Canada
For: City of Montreal, Canada
Key Jason Personnel: Peter Rumsey; Tom Sangster

NEW ST JAMES AVENUE INTERCEPTOR SEWER

Jason Consultants was invited by Boston Water & Sewer Commission to lead an Engineering Review of the proposed New St. James Avenue Interceptor Sewer in the Back Bay area of Boston, Massachusetts. This extremely technically challenging project involved the replacement and rehabilitation of the main sewer system in this prestigious commercial and historic area of the city. A broad range of trenchless techniques was proposed include on line replacement using microtunnelling, large diameter pipe bursting and complex relining.

The review team was responsible for instigating significant amendments to the proposed specifications and contract conditions to improve the risk assessment and problem solving during construction.

Client: Bryant Associates
For: Boston Water & Sewer Commission
Key Jason Personnel: Andy Robinson, James Thomson

BRISBANE CITY COUNCIL
REMEDIAL WORKS TO EAGLE FARM RISING MAINS

Brisbane Water, the Department of Water Supply and Sewerage for the City of Brisbane in Australia, appointed Jason Consultants to provide specialist consultancy services in connection with the rehabilitation of 11 km of twin 51 inch diameter prestressed concrete sewage rising mains. The mains have been the subject of much previous investigation by the City, which has identified internal corrosion over some sections, believed to be associated with extensive pockets of hydrogen sulphide gas. Jason’s role was to recommend and develop the repair methodology to be adopted for the mains, and to cost the various rehabilitation options.

Client: Brisbane Water - Brisbane City Council, Australia
Key Jason Personnel: James Thomson; Kevin Davies

CITY OF COLUMBUS, OHIO - SPRING STREET SEWER

Jason acted as the specialist consultant to URS - Greiner in evaluating and preparing rehabilitation proposals for 400 ft of 66” and 400 ft of 84” brick sewer. The initial task was to undertake an evaluation to determine the condition of old brick sewers which were located under a busy street carrying commercial and residential traffic. A series of renovation options were analysed and costed and recommendations made on the most cost-effective solution. Detailed specifications for the chosen option were prepared.

Client: URS - Greiner
Key Jason Personnel: James Thomson, Peter Rumsey

MIDDLETOWN INTERCEPTOR SEWER REHABILITATION

URS as main consultant was appointed by the City of Middletown, Ohio to investigate and undertake remedial works to the 60" interceptor sewer which was suffering from excessive infiltration. URS appointed Jason as specialist consultants to oversee the investigation, evaluate the results and propose rehabilitation measures.

The 60" interceptor sewer with a total length of 7100 ft was constructed from corrugated steel plate in 1956. The depth to invert was between 20 ft and 36 ft and access manholes were some 1000 feet apart. The interceptor was running full at all times and inspection had to be undertaken by divers. The structure was found to be in relatively good condition but a large percentage of the flow arose from infiltration. Alternative options for rehabilitating the line to reduce the infiltration were reviewed. This covered local repair and sealing and continuous lining. The recommended option of sliplining using a 54" plastic pipe was accepted and implemented.

Main consultants: URS Cincinnati
Client: City of Middletown, Ohio
Key Jason Personnel: James Thomson

MANAGUA CITY - NICARAGUA

Jason Consultants supported Canadian consultants Procter & Redfern in a project to develop a sanitary sewer rehabilitation scheme for the city. This involved the rehabilitation of 28 collector sewers, which discharged directly into Lake Managua, and the construction of 2 major interceptors as well as treatment lagoons and pumping stations. The total cost was expected to be approx. US$ 40 million.

Client: Procter & Redfern
Key Jason Personnel: Peter Rumsey

BASSA PUMPING MAIN, TEL AVIV, ISRAEL

Jason Consultants was appointed by the client to investigate failure of a 1250mm diameter asbestos cement force main in an urban area of Tel Aviv. Following the investigation we developed rehabilitation options for 7000 metres of mains, wrote Specifications and contract documents, evaluated bids and assisted the client and Contractor in implementing the chosen solution to meet the strict Specification requirements.

Client: Dan Region Association of Towns
Key Jason Personnel: Tom Sangster; James Thomson

EAST MISSION GORGE TRUNK SEWER REHABILITATION
CITY OF SAN DIEGO

East Mission Gorge Trunk Sewer was laid in 1962 and has a total length of 37,000ft of 36" to 42" concrete pipe together with more than 100 manholes. The sewer was laid close to stream course in the historical Mission Trails Regional Park. Access to the park for vehicles is extremely limited and much of the sewer is located away from the trail in rocky terrain with heavy brush only accessible on foot with difficulty.

The requirement was to undertake a detailed survey, evaluation and make recommendations on rehabilitating the sewer. Rehabilitation was required to
Restore the structural integrity
Restore the flow capacity
Remove extraneous flow

A major requirement was to design a solution which could be implemented without environmental impact on the Park. The work was awarded by City of San Diego to Dudek & Associates of Encinitas, in association with Jason and ADS. After a detailed review of a wide range of options two possible solutions were determined as being cost-effective and meeting the environmental concerns during installation: a CIPP lining system or a PVC spiral wound lining to the whole pipe length. Both required special measures such as helicopters to gain access and bring in materials to the line. In addition a number of sections required structural repairs prior to relining. A program of manhole rehabilitation was also developed.

Client: The City of San Diego Water Utilities Department
Principal Consultant: Dudek & Associates Encinitas, CA
Key Jason Personnel: Steve Kramer, James Thomson

NORTH SHORE CITY COUNCIL, NEW ZEALAND

North Shore City Council has the largest sewer rehabilitation program in New Zealand, part of a major project to eliminate overflows to its beaches. The Council appointed Jason Consultants to review earlier CIPP rehabilitation works and to advise on the most cost-effective way to undertake a 10 year investigation and renovation program. We have developed contract and procurement structures, advised on specifications, and provided on-site support and training to the Council’s engineering team.

Client: North Shore City Council, Takapuna, New Zealand
Key Jason Personnel: Tom Sangster; Paul Hayward