I recently became aware of updates to Virginia's SWPPP requirements.  Upon reviewing turbidity requirements for dewatering discharges, I was unable to find how the State suggests obtaining values of 10 NTUs or 50 NTUs.   

My professional experience indicates only two methods can achieve 10 NTUs or 50 NTUs, namely, retain all discharge waters or make use of flocculants. The former requires use of professionally designed containment systems.  Unfortunately, the latter does not appear in the State's updates as an acceptable mitigation method.   I strongly suggest you add the use of flocculants to be an acceptable method to achieve desired turbidity values for dewatering discharges activities.