Changes

It is important to evaluate the cumulative effectiveness of all the controls installed on a construction site. Turbidity (a proxy for TSS) of the site discharges or the receiving water system is typically measured to assess ESC effectiveness. Turbidity targets vary based on duration of exposure, as the extent of potential harm to receiving aquatic ecosystems is dictated by both concentration and duration:

It is important to evaluate the cumulative effectiveness of all the controls installed on a construction site. Turbidity (a proxy for TSS) of the site discharges or the receiving water system is typically measured to assess ESC effectiveness. Turbidity targets vary based on duration of exposure, as the extent of potential harm to receiving aquatic ecosystems is dictated by both concentration and duration:

{| class="wikitable"

{| class="wikitable"

|+ Table 3: Maximum allowable construction-based turbidity increases in the receiving water system at different durations

|+Table 3: Maximum allowable construction-based turbidity increases in the receiving water system at different durations

! Construction-based turbidity increase (NTU)

! Construction-based turbidity increase (NTU)

! Duration (h)

! Duration (h)