|Sustainable Paving Project|
MIST is working with different groups and individuals around Missoula to install various paving alternatives, with a strong emphasis on sustainability. These projects include:
Silver Park in the heart of Missoula.About one mile of trail was installed in 2013 that used psyllilum seed husk mixed with decomposed granite. This was put in just before winter and did not have time to properly cure, as well as some grading issues that need to be taken care of in 2015. Overall, this is a large scale application of paving a trail with organic, non-toxic ingredients. A psyllium trail is permeable, durable, meets ADA requirements and is cost effective.
MUD tool library: MIST helped put in about 2,000 sq feet of psyllium around the tool library at MUD (next to Home Resource) in Fall 2012. This was done instead of asphalt or concrete (which the City preferred). The psyllium installation passed inspection and meets ADA requirements.
Brick Walk at University of Montana: This project entails relaying the existing brick so that the brick is much closer together, thus meeting ADA (i.e. for wheel chair and blind pedestrian access). A test panel was laid in fall 2014 and is holding up well and looks great. The original proposal at UM was to remove all the historic brick and pour concrete slabs (made to look like brick). Concrete is very expensive, prone to cracking and is a major contributor to green house gas emissions. Clay brick is often a very sustainable method of paving, if laid correctly and given periodic maintenance.
Kim Williams Trail: We are working on a pilot project with Parks and Recreation to install another psyllium seed husk based trail from the Van Buren foot bridge eastward on the Kim Williams trail (southside of the river). No date has been set yet.
A 450' psyllium trail was put in place in Greenough Park in late Fall 2014.
Here are pictures we took of a psyllium installation at an Idaho golf course, which is replacing asphalt:
We are also working to help pave several parking lots and driveways with a non-asphalt surface. Clay bricks, concrete pavers, turf stone and psyllium are the mediums of choice currently.A pine resin based gravel blend is another type of soil stabilizing agent. An example was laid in Glacier National Park in Fall of 2011, for a half mile section of trail that begins at the parking lot in E. Glacier and goes towards Grinnel Glacier. A resin trail is planned for a trail section in the upcoming state park just east of Missoula.
Permeable asphalt makes up the parking lot at the St. Mary's Visitor Center on the east side of Glacier Park. An hour south of the visitor center, Running Eagle Falls trail was paved with pine resin (ResinPave or NaturalPave) in the 90's and has held up well.
Videos of sustainable paving techniques can be found on the Free Cycles youtube channel, including overviews of the above projects.