Mon-Fayette Transportation Project - Sections 52D & 52F2

DMJM Harris completed preliminary engineering for a new five-mile segment of the Mon-Fayette Expressway Project in Washington County, Pennsylvania. We also completed final design plans for 2.3 miles of the new four-lane divided roadway. Key features of this project include a diamond interchange with ramp toll plazas and interchange lighting, and the design of eight new structures, which range in length from 170 to 1,300 feet and in height from 50 to 110 feet.

By careful consideration of the needs of both the Pennsylvania Turnpike Commission and the mine, DMJM Harris created a plan that optimized the results for both parties. Examples of this include allowing the mine operations to place coal refuse against the expressway embankment slopes, thereby expanding the mine's storage capacity; placing a dam, which separates the expressway from the mine's slurry pond, at a location that maximizes the pond’s capacity and hence minimizes the amount of compensation due the mine's owner; and redesign of the environmental impact statement for mine access roads concepts that reduced the project cost by approximately $6 million and also allows for future recreational use of the refuse site after it is capped and reclaimed.