Contractors' in compliance with the guidance of the NCG01 suggestions address items regularly on an active construction site. Again, sometimes modifications to approved plans are required based on the criteria of "making an effort" and "effectiveness of the measures installed." Fortunately, contractors' who install measures internal to the site provide for a tiered set of protections before transport beyond the approved site becomes an issue. In the example below, after a significant event above design criteria, a surgical maintenance repair was required. The contractors' approved over the specified time following the event involved an initial removal of transported sediment to the sag in the road using flat head shovels and cleaning of catch basin sediment capture. Following initial removal, residual was allowed to dry then second pass involved mechanical brushing. Some contractors, in small areas, have accomplished this by using a "stiff bristle push broom" and a "leaf blower." Larger areas have been addressed using mechanized equipment with "broom attachments." Typically, the drying effect determines the number of passes required to remove "turbid water transport" in the surgical areas. High turbid water transport is usually addressed by the contractor adding additional measures routing water before it reaches a rock outlet.