Figure: 30 TAC §290.117(e)(5)
Monitoring Period | Reduced WQP List | Location | Frequency |
---|---|---|---|
Reduced monitoring |
pH, alkalinity, orthophosphate or silica1, calcium2 |
Reduced number of distribution sites |
Quarterly, annually5, or every 3 years6 |
pH, alkalinity dosage rate and concentration3, inhibitor dosage rate and inhibitor residual4 |
All entry point(s) | Every two weeks |
1Orthophosphate must be measured if an inhibitor containing
a phosphate compound is used. Silica must be measured if an inhibitor
containing silicate compound is used.
2Calcium must be measured if calcium carbonate
stabilization is used as part of corrosion control.
3Alkalinity must be measured if alkalinity is adjusted as
part of corrosion control.
4Inhibitor dosage rates and inhibitor residual
concentrations (orthophosphate or silica) must be measured if an inhibitor is
used.
5In accordance with subparagraph (B) of this paragraph, the
executive director may allow a system to sample WQPs in distribution annually
if it has operated within approved Optimal Water Quality Parameters (OWQPs) three consecutive years of monitoring.
6In accordance with subparagraph
(C) of this paragraph, the executive director may allow systems to sample WQP
in distribution once every three years if the system has operated within
approve OWQP ranges during three consecutive years of annual monitoring. The
executive director may allow a system to sample WQPs in the distribution once
every three years if it has maintained 90th percentile lead levels less than
or equal to 0.005 milligrams per liter (mg/L), 90th percentile copper levels
less than or equal to 0.65 mg/L, and has operated within approved OWQP ranges
during two consecutive six-month monitoring periods.