Erosion and Sediment Control
Erosion and Sediment Control Case Study and Lessons Learned at a Private Race Track in the New Hampshire White Mountains
Back in 2013, Club Motorsports began building a very unique private race track located at the edge of the New Hampshire White Mountains. The design boasted 2.5 miles of race track, nested within a hundred wooded acres, with breathtaking views. The uniqueness of this track is found in the 250 feet of elevation change and its 15 individual turns with the relatively compact footprint. The project was completed in 2017.
Major erosion challenges emerged quickly related directly to the extreme elevation. Over 1.4 million cubic yards of dirt was relocated to build and shape the track. Some of the specific erosion problems encountered during the construction included, slope stabilization and track shoulder erosion, among others. The team work on this project was critical. Team was built with ownership, engineer, contractor, wetland scientist, erosion control specialists and sub contractors. All working for a common goal to minimize the erosion, soil loss, storm-water runoff and overloading sediment ponds. As an example of this, we had a major rain event two days after they had finished paving the track. The contractor didn’t have time to start bringing the topsoil up to the track. The owner started calling to get ideas on how he could protect the asphalt from being undermined. We collectively came up with several different solutions.
This presentation will review several different storm-water challenges that were faced, how they were discovered, the solution that were put in place, and the results. During construction, a wide variety of erosion control solutions were used, which will be reviewed. Including erosion control blankets, turf reinforcement mats, hydraulically applied erosion mulches, cellular confinement solutions, Compost soxx and wattles. The presentation will talk about why we used certain solutions over other solutions. Example of that would be with where and when we used compost soxx instead of wattles. We had some areas we used wattles instead of compost soxx. Silt fence was also used on this project, but only as a final line of defense, not as a stand alone solution. The presentation will also cover a value engineering solution with using a TRM in the swales along the track. The swales were spec’d with rock riprap, the owner and engineer were willing to change the swales to be lined with a TRM. Not only was it a cost savings, it was a more environmentally friendly solution.
Attendees will take away exposure to a wide variety of erosion control methods and solutions that can be applied to many current and potential projects.