On the morning of July 24,
2010, ten turbidity samples were collected in the sediment basin. The
turbidity readings were all well below the performance standard of 250 NTUs,
with all results being below 50 NTUs. Therefore, the skimmer was
flipped to allow discharge from the sedimentation basin. A turbidity
reading was collected at the discharge point shortly after discharge; the
result was 124 NTUs. The discharge was monitored frequently and at
approximately 7:40 am, in response to a turbidity reading of 177 NTUs,
discharge from the basin was stopped.
After allowing additional
time for sediments to settle out, the basin was re-evaluated in the
afternoon. Turbidity readings were again collected in the
sedimentation basin; all results were below 75 NTUs. The skimmer was
therefore flipped again to allow discharge from the sedimentation basin.
A turbidity reading was collected at the discharge point shortly after
discharge; the result was 73.5 NTUs. The basin was checked
approximately every half hour throughout the rest of the day with all
readings being below 100 NTUs. At 5:40 pm discharge from the sediment
basin was stopped for the weekend.
