Crossing Team

JD Hair & Associates, Inc.

JD Hair & Associates, Inc. - Significant Projects

Colville River Crossing for Alpine Development, Alaska

The Colville River Crossing for ARCO's Alpine Development consisted of four 4,300-foot HDD installations through permafrost in the Alaskan Arctic. Subsurface conditions tested the limits of HDD technology while North Slope winter construction conditions required work to be carried out on ice work pads in temperatures ranging to -50 degrees Fahrenheit. JDH&A provided the initial feasibility analysis that demonstrated to the owner and permitting authorities that HDD could be applied at the Colville River. This initial work was followed by consultation relative to design and construction methods and field engineering for quality assurance.

Hudson River Crossing for Central Hudson Gas & Electric, New York

This Hudson River crossing is part of a 16-inch welded steel pipeline that delivers natural gas from the Iroquois Pipeline to Central Hudson's Roseton Generating Station. JDH&A functioned as design consultant to Central Hudson for this challenging crossing. This involved preliminary design and feasibility analysis, preparation of permit applications, geotechnical investigation, preparation of specifications and design drawings, and construction monitoring. The crossing, located near Poughkeepsie, New York, was approximately 4,500 feet in length. The geology at the site required a creative design involving a combination of cut and cover and trenchless techniques. Installation was completed in the spring of 1992.

Alliance Pipeline, United States and Canada

This high-pressure natural gas pipeline extending 1,900 miles from northern British Columbia to Chicago was designed and constructed to the highest environmental and safety standards required by regulatory bodies in both Canada and the United States. During the initial feasibility and permitting stage, JDH&A reviewed more than fifty major waterway crossings to determine the optimum crossing installation method. This was followed by design and construction monitoring for the HDD crossings in Canada and design consultation for the HDD crossings in the United States. All of the HDD crossings were completed by the summer of 2000.

Louisiana and Mississippi

This 274 mile natural gas pipeline extends from the Perryville Hub in northeastern Louisiana to the Gulfstream Natural Gas System in southern Mobile County, Alabama. It is composed of 42 inch and 36 inch welded steel pipe with a transmission capacity of 1 billion cubic feet per day. JDH&A was responsible for design and construction monitoring for all twenty-seven HDD crossings. This included geotechnical surveying at all of the HDD sites and hydrographic surveying at the Mississippi River Crossing.

Middletown to Norwalk 345 kV Project, Connecticut

This project involved five HDD crossings beneath waterways and rivers in congested urban environments throughout Connecticut. Crossing lengths ranged from approximately 700 feet up to 1,650 feet. Each crossing involved two parallel segments, each consisting of four 10-inch and one 8-inch HDPE conduits. JDH&A, working as a sub-consultant to Burns & McDonnell, provided HDD design and engineering services as well as construction quality assurance.

Nova Scotia, New Brunswick, Maine, New Hampshire, and Massachusetts

This 886 mile pipeline extends from Nova Scotia through New Brunswick, Maine, New Hampshire, and Massachusetts where it delivers gas into pipeline systems in the Boston Metropolitan area. JDH&A held the HDD engineering position on the large multidiscipline design team assembled for this project. This involved field reconnaissance at more than 50 potential HDD crossing sites to evaluate HDD feasibility. Feasibility evaluation was followed by implementation of an extensive geotechnical exploration program for potential crossings in the State of Maine, production of design drawings for crossings in the U.S. and Canada, expert testimony before regulatory agencies, and consultation during the construction phase.

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