Yes. The Upper Occoquan Service Authority has a project going on in the Big Rocky Run Stream Valley. There is a gravity sewer pipeline that follows the river and they are doing relining.
http://www.fairfaxcounty.gov/parks/press/html/pr061-12.htm
With any luck they will be done with the project by the end of the week. I understand the work was necessary but:
a) residents were given no notice of the work being done
b) they are running trucks and equipment 24/7
c) supposedly they were to be using "quiet" pumps on the bypass lines - HA! They have some incredibly loud pumps running within 150 yards of peoples houses
d) they are making a royal mess of the trails, trees, common areas and road. It will be interesting to see if they clean things up when they leave the scene.