Camp Mack is a Boy Scout camp, that requires a permit ($25) good for 12 months. The permit system is administered by Green Mountain Cyclery (http://www.greenmtncyclery.com/) in Ephrata on behalf of the Scouts.
SAMBA has a good relationship with the land manager (Ranger) and has been eliminating unsustainable trails and replacing with contour trails, with great success.
It's awesome that you guys found a workable solution that keeps trails available to all. But I'm curious. What makes a trail unsustainable? And what's a contour trail?
Generally, unsustainable is anything that will wash away and erode with no one hiking, biking etc. just water running down the trail and taking the dirt with it. The trails at Mack were old logging trails, that went straight up and straight down the hills. A contour trail runs across the fall line of the hill. The IMBA guidelines of trail pitch are no more then 1/2 the slope trail and no more then 15%. This is a short explanation, IMBA.com has some great articles if you want to read more about it.