Regional Board Resolution No. R5-2002-0127, adopted on July 19 2002 by the Central Valley Regional Water Quality Control Board (CVRWQCB), amended Chapter 3, Water Quality Objectives by establishing the following site-specific pH and turbidity objectives for Deer Creek in El Dorado and Sacramento Counties:
The pH of the receiving water shall not be depressed below 6.5 nor raised above 8.5.
When the dilution ratio for discharges is less than 20:1 and where natural turbidity is less than 1 Nephelometric Turbidity Unit (NTU), discharges shall not cause the receiving water daily average turbidity to exceed 2 NTUs or daily maximum turbidity to exceed 5 NTUs. Where natural turbidity is between 1 and 5 NTUs, discharges shall not cause receiving water daily average turbidity to increase more than 1 NTU or daily maximum turbidity to exceed 5 NTUs. Where discharge dilution ratio is 20:1 or greater, or where natural turbidity is greater than 5 NTUs, the general turbidity objectives shall apply.
Cal. Code Regs. Tit. 23, § 3944