Applied Geology and Geophysics Used in the Widening of New Hampshire’s Interstate 93 [Poster]
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2006-06-12
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Alternative Title:Title Integrated geophysical methods for geotechnical subsurface investigations : poster
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Abstract:Interstate I-93 is an important northeast corridor, connecting the states of Vermont, New Hampshire and Massachusetts. Interstate 93 extends 210 miles from St. Johnsbury, VT in the north, through 142 miles in New Hampshire (including the cities of Concord and Manchester) and ends in Dedham, Ma. The original interstate was built in the 1960's and can hold a maximum volume of 60 to 70 thousand vehicles per day. The Department of Transportation (DOT) in NH found that in 1997 there was an average of 105,000 vehicles traveling per day on the section of I-93 in Salem and 60,000 to 80,000 vehicles traveling per day through segments north of Exit 1 in Salem. DOT traffic projections revealed that by 2020, 140,000 vehicles per day would travel or pass through the already very congested and dangerous stretch of I-93 in Salem. The state of NH put forth plans to build two more lanes both north and south bound on I-93 from the border of New Hampshire and Massachusetts in Salem, NH to the I-93/I-293 intersection in Manchester, NH. The project will expand 18 miles of interstate and take ten years to complete at an estimated cost of 420 million dollars. The project will be one of the largest construction jobs in New England while under construction. The Engineering/Geology section of the DOT will play a large role in the planning of I-93. Before the expansion of I-93 can take place a great deal of preliminary geological data must be collected. To build a road properly engineers and construction companies need to gather critical geologic data including the soil type and depth to bedrock. This poster reviews several important data collecting steps needed for making informed decisions on the amount and type of material to be removed during the roads construction.
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