MAPOCHO INTERCEPTOR SEWER, SANTIAGO, CHILE.

The $15 Million first phase programme to intercept sewerage outfalls to the Mapocho river in downtown Santiago. The phase requires the construction of over 9 km of 1.6m diameter sewer in an original design based on open cut methods. Jason Consultants working with Santiago consulting engineers Ifarle were requested by Empresa Metropolitana de Obras Sanitarias (EMOS), Santiago’s sewer system owners, to investigate alternative construction solutions using Trenchless Technology to reduce the disruptive impact of the works on the city. Jason Consultants undertook a complete review of the scheme requirements and recommended within a detailed technical and economic report the use of pipe jacking for a significant proportion of the scheme. Approval for second stage design is anticipated shortly in which Jason will continue their role of technical advisor for the full pipe jacking design.

Client: Ifarle Ingenieros Civiles Consultores Ltd
For: Empresa Metropolitana de Obras Sanitarias (EMOS)
Key Jason Personnel: Andy Robinson, James Thomson

COLECTOR VIÑA DEL MAR - VALPARAISO, CHILE

The historic port of Valparaiso and its adjacent holiday resort of Viña Del Mar are currently being joined by a major collector sewer. This World Bank funded project had run into difficulties due to poor ground conditions. Jason Consultants were retained with Santiago based consulting engineers Ifarle to provide technical expertise and solutions for the 5 km of 2.1m diameter collector to be completed. The client ESVAL accepted Jason’s recommendations and project redesign for completing the $10 Million of remaining work using Earth Pressure Balanced tunnelling methods. Jason continued to provide technical expertise on site during the execution of the remainder of the works.

Client: Ifarle Ingenieros Civiles Consultores Ltd
For: Empresa De Obras Sanitarias De Valparaiso SA
Key Jason Personnel: James Thomson, John Cuniberti, Andy Robinson

CONCORD, NEW HAMPSHIRE

As part of the commercial development of land adjacent to Concord Municipal airport, the City of Concord, New Hampshire required the construction of a new off site sewer. Working as specialist consultant to Hoyle, Tanner & Associates of Bedford, New Hampshire, Jason carried out a preliminary design and recommendations study of the potential for the application of Trenchless Technology to this 7,500 foot long project. Jason specifically recommended the use of microtunnelling for portions of the work which are located at depth in water bearing ground or below sensitive structures. The study included technical, geotechnical, economic and impact evaluation of the proposed work. Jason assisted HTA in the final design of the project which will include sections of 24” diameter microtunnelling.

Client: Hoyle, Tanner & Associates
For: City of Concord, New Hampshire
Key Jason Personnel: Andy Robinson, James Thomson

CORONA AVENUE VORTEX FACILITY, QUEENS, NEW YORK

The City of New York proposed to construct a vortex facility in Corona Avenue, Queens for the separation of solids from foul water effluent. The construction of this major project resulted in the need to construct a new 48” diameter outflow foul waste sewer from the facility to an existing pumping station some 1,800 feet away. Jason Consultants were employed by the main Engineering Design Consultants, URS of Newark, New Jersey, to carry out a peer review for the design of the proposed foul waste sewer. The review covered all technical and contractual aspects of the proposed work which had been based around mechanical, remote control pipe jacking techniques through soft alluvium. The review included assessments on the effect to sensitive structures beneath which the new pipeline passes, and traffic restrictions effecting the adjacent Horace Harding Expressway and Central Parkway.

Client: URS Consultants
For: City of New York
Key Jason Personnel: James Thomson, Andy Robinson,

DESERT RIDGE PROJECT, PHOENIX

The Desert Ridge project is an infrastructure improvements project situated in native desert to the north of Phoenix, Arizona. As part of this project, Jason Consultants has assisted BRW consultants of Phoenix in the use of pipe jacking techniques for a 42” bore crossing of a section of Bureau of Reclamation dike. The assistance provided covered the construction options, cost estimates and specifications for the works based on a pipe jacking method.

Client: BRW Consultants
For: North East Phoenix Residential Limited Partnership
Key Jason Personnel: Steven Kramer, Andy Robinson

BOSTON LOW LEVEL SEWER

Jason Consultants were employed by LEA Group of Boston as technical consultants for microtunnelling work on Boston Sewer and Water Commission’s East Boston Low Level Sewer project. Assistance included technical and economic analysis of a difficult 500 foot section of the work through ground containing a high proportion of cobbles and boulders. The contract was completed on the basis of a 30” diameter microtunnelling process in three lengths of maximum 350 feet. Jason provided site supervision and specialist technical evaluation during the completion of the work to quantify and limit any additional works or claims made by the contractor to the client as a result of onerous ground conditions.

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

PIPE DESIGN, BRAZIL

Acting as specialist technical consultant to BUREAU de projectos e Consultoria Ltda, Jason Consultants has provided a design review and approval for the design of concrete jacking pipes to be used by the Brazilian contractor Construcoes E Comercio CAMARGO CORREA SA on a 15Km pipeline project. Five kilometres of 1500mm diameter pipe jack is to be constructed using remote controlled slurry tunnelling equipment.

Client: BUREAU de projectos e Consultoria Ltda LEA Group
For: Construcoes E Comercio CAMARGO CORREA SA
Key Jason Personnel: James Thomson, Andy Robinson, Eric Rowlands

BARBADOS SOUTH COAST SEWAGE COLLECTION SCHEME

Reid Crowther was the Engineer responsible for the design of a new sewage collection system, treatment works and outfall to serve an extensive area along the South coast of Barbados. The flat topography, narrow streets and difficult ground conditions (sands and gravel’s with high water table, overlying rock) were such that traditional construction methods would have been both disruptive and expensive. Jason Consultants were retained by the Engineer to undertake a comprehensive review of the proposed works and to design alternative installations by non-disruptive Trenchless methods. Some 7000 metres of sewer and rising main was redesigned to be installed by pipe jacking and microtunnelling methods. Jason also provided support to Reid Crowther throughout the construction programme.

Client: Reid Crowther
For: Barbados Water Authority - Sewerage and Solid Waste Project Unit.
Key Jason Personnel: James Thomson, Andy Robinson,

VILLAVICIOSA SEWAGE COLLECTION SCHEME, SPAIN

A complete new collection, treatment and outfall system has been designed for the town of Villaviciosa in Northern Spain for client the Regional Government of Asturias. The flat topography results in sewers having to be laid at considerable depth in ground conditions ranging from soft alluvial deposits to hard limestone. Jason Consultants were retained by PYCSA, a Spanish consulting engineer, to design extensive lengths of deep sewers for installation by Trenchless methods. We undertook the initial investigations, made recommendations for site investigations, designed approximately 10 kilometres of sewer for installation by microtunnelling and advised on the construction of a directionally drilled outfall to be bored 1200 metres out to sea through limestone.

Client: PYCSA
For: Regional Government of Asturias

JAKARTA SEWER INSTALLATION. INDONESIA

Alpin Consult of Zürich, Switzerland, was the principal consultant for an extensive sewage collection system for Jakarta. The original design and specification were based on open cut working but this had resulted in very slow working, high cost and extensive damage to property and roads. Alpin Consult retained Jason Consultants to advise on non-disruptive alternatives. We designed a new layout using jacking methods at depth in soft alluvial clays which eliminated disruption and was much less costly.

Client: Alpin Consult
Key Jason Personnel: James Thomson.

ROSSDALE WATER INTAKE. EDMONTON, CANADA

Jason Consultants were invited by the City of Edmonton to undertake a review and make tunnelling recommendations for the Rossdale Water Intake. The project involves installation of 11 km of 1500 mm diameter pressure water main under residential areas at depths from 10 to 70 metres and predominantly in sedimentary rock strata. We surveyed the line, in conjunction with a local consulting engineer, and prepared a layout and tunnel and shaft designs for installation of a perfectly watertight potable water tunnel.

Client: Reid Crowther
For: City of Edmonton
Key Jason Personnel: James Thomson, Andy Robinson.

RIVER CROSSING. WILMINGTON, NORTH CAROLINA. USA

Principal consultant Black & Veatch employed Jason Consultants as specialist consultant to advise on shaft and tunnel construction on a 380m long river crossing for two water pipes. The work required tunnelling through rock with sand lenses below a high water table at depths of up to 40m. Shaft construction costs were a critical aspect of the work. Jason carried out a full analysis and cost evaluation for alternative construction methods and recommended the use of twin 1500mm diameter “piggy back” tunnels driven by remote controlled machine. This approach reduced the shaft diameter required and thus cost and also provided better equipment availability opportunities for the tunnelling over the originally proposed single large diameter bore.

Client: Black & Veatch
For: City of Wilmington, North Carolina
Key Jason Personnel: James Thomson, Peter Rebull

MANGGARAI UNDERPASS, JAKARTA, INDONESIA

Jason Consultants Ltd were retained by Freyssinet Hong Kong for the design of the jacking facility for the installation of a large pedestrian underpass beneath a live rail junction. The project to install a 33m long single section prefabricated concrete box of 13.25m by 6.7m profile was completed at the end of 1995. Jason’s work involved the design of all temporary works for the installation of the box by a jacking method, together with establishment of method statements, construction recommendations and supervision of the jacking operation for the client.

Client: Freyssinet Hong Kong
For: City of Jakarta
Key Jason Personnel: James Thomson, Tom Sangster, Andy Robinson

CITY OF CINCINNATI
BRITTON AVENUE AREA STORM SEWER

Jason Consultants were retained by Woolpert Consultants of Cincinnati to investigate the suitability of pipe jacking for sections of the City’s proposed Britton Avenue Area Storm Sewer. Jason recommended the use of pipe jacking for the installation of the 1888 feet of 66” internal diameter pipeline at depth within a residential area. Jason also completed design recommendations and specifications for this portion of the project together with the jacking pipe designs in reinforced concrete cylinder pipe and glass reinforced plastic for the work.

Client: Woolpert Consultants
For: City of Cincinnati
Key Jason Personnel: James Thomson, Andy Robinson

MIAMI-DADE, FLORIDA
10 FOOT DIAMETER OUTFALL PIPELINE
Jason Consultants were employed by Hazen and Sawyer on behalf of Miami-Dade Water and Sewer Department to review the technical feasibility and cost estimates for the construction of a 10 foot diameter offshore pipeline to form a new sea outfall to one of the departments current outfall points. Due to environmental considerations, alternatives to conventional open cut needed to be investigated.
Jason confirmed the technical feasibility and provided cost estimates for jacking sections of the outfall in lengths of up to 4600 feet in length (1.4km). Jason’s support evidence included a historic record of large diameter long pipejacks previously completed around the world.

Client: Hazen & Sawyer, Miami
For: Miami-Dade Water & Sewer Department
Key Jason Personnel: James Thomson, Andy Robinson

CITY OF MANCHESTER, NEW HAMPSHIRE
COHAS BROOK INTERCEPTOR PROJECT

Jason Consultants were invited to join the engineering feasibility team to provide direct input and consultation and advice to this major sewerage project.

The Cohas Brook interceptor project is one of the last major projects requiring construction to complete the Manchester Water Pollution Abatement Program. The Cohas Brook project will require the construction of some 9 miles of sanitary sewer or pumping main and will enable the opening up of considerable land development potential to the South and East of the City.

The gravity route option will require the construction of the sanitary sewer of up to 42” internal diameter through ground within the Cohas Brook valley at elevations below that of the brook itself. Sections of the route are effected by ground conditions, terrain elevations and other surface features. Jason’s work involved the study of technical and economic feasibility for the use of trenchless methods for the construction of large sections of the proposed gravity alignment.

Client: Hoyle Tanner and Associates/Costello, Lomasney & deNapoli, Inc./
Camp Dresser & McKee Inc.
For: City of Manchester, New Hampshire
Key Jason Personnel: Andy Robinson, James Thomson

BANGKOK WASTEWATER PROJECT STAGE 1

Jason Consultants participated in a Construction Method Review in conjunction with local engineers Sindhu Montgomery Watson to optimise trenchless construction in the 50 km sewer network being installed in the centre of Bangkok. Owing to severe traffic congestion in the city the planned open cut method for parts of the network is not feasible. Jason Consultants undertook a complete review of the sewer installation and developed a scheme to install the sewers by microtunnelling and guided drilling. We also advised on equipment, method and specification to ensure that the work is undertaken efficiently, and have provided revised cost estimates to the client. This scheme, adopted by the client, resulted in direct cost savings, a shorter construction period, and a dramatic reduction in impact on the city.

In addition we reviewed the existing microtunnelling activities and proposed measures to improve progress and reduce costs. Our involvement was subsequently extended to include advising on procurement of specialist contractors and to assisting with detailed design and implementation.

Client: Sindhu Montgomery Watson
For: Noss Consortium
Key Jason Personnel: Tom Sangster, James Thomson, Andy Robinson

LOWER WARREN AVENUE SEWER
UNION SANITARY DISTRICT, CALIFORNIA

The lower Warren Avenue Sewer required the installation of over 4,000 feet of 8” to 21” diameter PVC sewer pipe to replace an existing sewer pipeline. As part of the work, three major highway crossings were required. These crossings were completed by installing 26” OD steel casings by slurry microtunnelling through the water bearing sands silts and clays with drive lengths of up to 440 feet. Jason consultants were employed by construction supervising engineers, Sverdrup, to provide microtunnelling review and on site supervision and training at the commencement of microtunnelling work together with technical support during the construction phase.

Client: Sverdrup
For: Union Sanitary District, Almeda County, North California, USA
Key Jason Personnel: Andy Robinson, Peter Rumsey

COPPELL SEWER DEVELOPMENT
CITY OF LEWISVILLE, TEXAS

The Coppell sewer development required the installation of 8,500 feet of up to 27” diameter sewers at depths of up to 28 feet through primarily greenfield site but close to an established highway construction easement.. Jason Consultants were retained by Rady & Associates of Fort Worth, Texas to develop an alternative design and construction documents to enable the project to be bid by a trenchless method as an alternative to open cut. The work centred on suitability assessment of the alignment for microtunnelled construction and the development of technical specifications.

Client: Rady & Associates, a division of Kimley Horn.
For: City of Lewisville, Texas
Key Jason Personnel: Andy Robinson

ABERDEEN, AP LEI CHAU & POK FU LAM SEWERAGE - STAGE 1, HONG KONG

Jason Consultants were retained by Atkins Haswell as trenchless technology engineering consultants for the design of 3,400 meters of up to 1500mm diameter sewer pipeline by microtunnelling and remote controlled jacking along alignments which are affected by both poor ground conditions and heavy overhead traffic and existing utilities. The new pipeline, which forms the final section of a major interceptor line feeding the Aberdeen main pumping station, is part of a larger scheme designed to improve the overall sewer pipeline infrastructure of the area following a review of the overall drainage plan for the area.

Client: Atkins Haswell
For: Drainage Services Department, Hong Kong Government
Key Jason Personnel: James Thomson, Andy Robinson

SANTIAGO METRO. CHILE

The city of Santiago with its severe traffic congestion is continuing to improve and enlarge its mass transportation system. As part of ongoing studies into the routing for future Metro extensions Jason Consultants were requested to assist Santiago based engineering consultants, Testing, in a review of all large soft ground tunnelled metro projects planned, designed or constructed since 1980. The 38 projects identified were analysed to provide the client, the Metropolitan Mass Transit Co., with a detailed breakdown on the technical and commercial aspects of each project. Our report included information on the methods of construction and costings for both stations and tunnels.

Client: Testing
Key Jason Personnel: James Thomson, Andy Robinson

MICROTUNNELLING OPERATOR TRAINING

J F Donelon of Bolton, UK employed the services of Jason Consultants to train two new operators for its Decon/Soltau RVS microtunnelling system. The training carried out on two major road crossings in Chorley, UK enabled Donelon to complete the work on programme with significantly reduced risk. The work involved the installation of 150m of 600mm internal diameter concrete microtunnelling pipe through mixed sands, silts and clays partially below the water table. Experienced Jason staff passed on comprehensive advice and assistance during the two 5 day crossings.

As a further assistance to J F Donelon, Jason assisted with operator activities on its 80m drive beneath the main London to Glasgow West Coast rail line at Lancaster, UK. The 1000mm internal diameter pipe forms part of tank sewer and passes through glacial boulder clay and wet sands. The drive was undertaken using Donelon’s Herrenknecht AVN 800 slurry microtunnelling system.

Client: J F Donelon
Key Jason Personnel: Andy Robinson

KUWAIT CITY SEWER REPLACEMENT AND REHABILITATION PROGRAMME

As part of the massive rehabilitation programme of the Kuwait sewerage system, modern ‘No Dig’ microtunnelling is being utilised to reduce the impact of sewer renewal in mainly residential areas of the city. Euro Iseki of Stratford, UK and one of the worlds largest suppliers of microtunnelling equipment, had supplied three complete systems to a Kuwaiti contractor for the installation of 250 to 700mm diameter clay pipes. Jason Consultants, working for Euro Iseki, provided the contractor with technical, operations and project management advice and support enabling improved overall productivity, quality and sector profitability on a contract with a very tight working programme.

Client: Euro Iseki Ltd
For: United Gulf Construction Co.
Key Jason Personnel: Andy Robinson

THE NEW ST JAMES AVENUE INTERCEPTOR SEWER, BOSTON, MA

Jason Consultants were 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. Almost all trenchless techniques were 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. This project was a winner of the Trenchless Technology Project of the Year award.

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

INVERNESS FORCE MAIN, PORTLAND, OREGON

Jason Consultants undertook a review of a section of this major force main project, which had encountered difficulties with landowners on the proposed open cut alignment alongside the Columbia River. The section of the project was reviewed to ascertain the feasibility and likely cost of microtunnelling to reduce disruption to the community and damage to existing landowner property during the work. The constraints were compounded by Corp of Engineers restrictions in the levee through which the alignment passes.

Client: Bureau of Environmental Services, City of Portland, OR.
Owner: Bureau of Environmental Services, City of Portland, OR.
Key Jason Personnel: Andy Robinson

PUBLIC BATHS FORCE MAIN, HONOLULU, HAWAII

Jason Consultants were retained by Delta Construction Corporation to assist in the development of caisson shaft sinking methods for this project. The works require the installation of microtunnelled steel pipe from shafts sunk through water bearing beach sands, cemented material and lagoonal silt. Jason provided conceptual design and on-site technical training and support for shaft sinking operations.

Client: Delta Construction Corporation
Owner: City and County of Honolulu, Hawaii
Key Jason Personnel: Andy Robinson

SANITARY SEWER CONSTRUCTION – CITY OF CAPE GIRARDEAU, MO

Jason Consultants acted as technical consultant for the evaluation and development of innovative trenchless construction methods for installing 8 to 18 inch diameter pipes on this 4,800 feet sanitary sewer project to separate sanitary sewage from the existing combined system. As the project was constructed in a fully developed residential area, innovative construction methods were used to minimise neighbourhood disruption.

Client: Sverdrup Civil Inc
Owner: City of Cape Girardeau
Key Jason Personnel: Andy Robinson

RIO BOGOTÁ INTERCEPTOR – TORCA TO SALITRE, BOGOTÁ, COLOMBIA

Jason Consultants acted as advisers covering tunnelling related aspects of the 6.4 mile, 10 foot diameter tunnelled interceptor collecting grey water flow that currently discharges directly to the Rio Bogotá. Responsibilities include evaluation and recommendations for project construction documents and technical specifications and technical support and contractor submittal reviews during construction for this design and build project.

Client: Empresa de Acueducto y Alcantarillado de Bogotá
Key Jason Personnel: David Abbott, James Thomson, Andy Robinson

WESTERN RUN INTERCEPTOR, BALTIMORE, MD

Jason Consultants acted as technical advisor for this project to install 860 feet of 30” parallel relief sewer to alleviate flooding in the Mt. Washington area of northwest Baltimore. The works are undertaken by slurry microtunnelling methods through weathered rock and river deposits alongside Western Run. Specific tasks during the design phase included evaluation and recommendations relating to proposed alignments and construction documents. Construction management support is also being undertaken including submittal reviews for the trenchless works, inspector training in microtunnelling operations and on and off site project monitoring during the pipe installation.

Client: Patton Harris Rust and Associates, pc
Owner: City of Baltimore
Key Jason Personnel: James Thomson, Andy Robinson, David Abbott

WEST ELIZABETH AVENUE STORM DRAINAGE PROJECT, LINDEN, NJ

Jason Consultants were retained by Dawn Engineering to evaluate the installation of a storm sewer system by means of box/tunnel jacking under twelve (12) existing railway lines for a distance of approximately 300 feet. The proposed railroad tunnel crossing is a part the West Elizabeth Avenue Storm Drainage Project. The proposed storm sewer system and a new outlet will improve drainage and alleviate flooding within the area of West Elizabeth Avenue.

Client: Dawn Engineering
Owner: City of Linden, New Jersey
Key Jason Personnel: James Thomson, Andy Robinson

ACUSHNET RIVER CROSSING, BEDFORD, MA

Commonwealth Electric is involved with the Army Corp of Engineers at the Acushnet River Dredge Superfund Site in New Bedford, MA. The dredging operation affects numerous existing electric cable routes crossing the river. It was necessary therefore that a series of new crossings be provided to relocate the existing cabling below the Acushnet River. A proportion of the works has been earmarked for construction by microtunnelling. Jason Consultants were retained by Commonwealth Electric to review the design basis and specifications for construction of two 42inch internal diameter pipe jacked crossings using the microtunnelling technique.

Client: Commonwealth Electric
Owner: Army Corp of Engineers
Key Jason Personnel: James Thomson, Andy Robinson

DWYER ROAD DRAINAGE PUMPING STATION IMPROVEMENTS,
NEW ORLEANS, LA

McElwee Brothers, Inc. requested Jason Consultants to review preliminary proposals for the construction of a portion of the works by jack and bore methods, the proposal to jack and bore being a variation from the open cut construction method specified under the Contract. The project required the construction of new drainage discharge pipework from a new pumping station to the Inner Harbour Navigation Canal. The discharge section was approximately 800 feet long of which 215 feet was to be constructed as three parallel 84 inch diameter jacked steel pipes.

Client: McElwee Brothers, Inc
Owner: New Orleans
Key Jason Personnel: Andy Robinson

MICROTUNNELLING CONTRACTOR TECHNICAL SUPPORT

Jason Consultants has been retained by one of the UK’s major microtunnelling contractors to assist in the technical assessment of conditions and techniques relating to microtunnelling in support of their contractual requirements. Work to date has included: evaluation, technical support and expert witness work relating to a major microtunnelling project in Kilsyth, Scotland; evaluation, technical support and expert witness work relating to a major microtunnelling project in Chichester, England; evaluation and technical support relating to a microtunnelling project at Standish, Lancashire; evaluation and technical support relating to a microtunnelling project in Leeds, Yorkshire.

Client: A E Yates
Key Jason Personnel: Andy Robinson, James Thomson