Best Management Practices are the voluntary standards put in place to protect water quality on forest operations. Unfortuantely, not all loggers follow these guidelines completely. There is a way to ensure that BMP's are followed on your property during a timber harvest. Talk to your forester. Any timber sale contract can include a clause requiring loggers to follow ALL Best Management Practices. Make sure your forester knows how important this is to you, so he can monitor the logging job for any non-compliance.

Is it true that the public VDOF forester is charged with the duty of BMP compliance in all forestry operations in Virginia?

The Virginia Department of Forestry is charged with monitoring all logging jobs in Virginia to ensure that logging operations pose no threat to water quality. This is why it is mandatory for loggers to report any logging activity to DOF within 3 days of beginning operations.
Keep in mind, Best Management Practices are voluntary, so not all loggers follow all practices. The county forester can only enforce BMP's that if not followed, pose an iminent threat to water quality.
For example, loggers aren't required to have a pre-harvest plan, nor are they required to keep a haul road below 10% grade.
For an example of what can happen when BMP's are not followed, check out this logging job from Buchanan County, dubbed "the worst logging job ever" by VDOF staff.
http://www.virginiaforestwatch.org/news ... 41405.html