Your system must meet two strengthened combined filter effluent turbidity limits.
(a) The first combined filter effluent turbidity limit is a ``95th percentile'' turbidity limit that your system must meet in at least 95 percent of the turbidity measurements taken each month. Measurements must continue to be taken as described in Sec. 141.74(a) and (c). Monthly reporting must be completed according to Sec. 141.570. The following table describes the required limits for specific filtration technologies. ------------------------------------------------------------------------
Your 95th percentile
(1) Conventional Filtration or Direct 0.3 NTU.
Filtration.(2) All other ``Alternative'' Filtration.. A value determined by the
State (not to exceed 1 NTU)
based on the demonstration
described in Sec.
141.552.------------------------------------------------------------------------
(b) The second combined filter effluent turbidity limit is a ``maximum'' turbidity limit which your system may at no time exceed during the month. Measurements must continue to be taken as described in Sec. 141.74(a) and (c). Monthly reporting must be completed according to Sec. 141.570. The following table describes the required limits for specific filtration technologies. ------------------------------------------------------------------------
Your maximum turbidity value
(1) Conventional Filtration or Direct 1 NTU.
Filtration.(2) All other ``Alternative Filtration''.. A value determined by the
State (not to exceed 5 NTU)
based on the demonstration
as described in Sec.
141.552.------------------------------------------------------------------------ [67 FR 1839, Jan. 14, 2002, as amended at 69 FR 38856, June 29, 2004]