Utah Admin. Code R309-215-12 - Monitoring Requirements for Disinfection Byproducts Precursors (DBPP)
(1) Routine monitoring. Surface water systems
which use conventional filtration treatment (as defined in R309-110) shall
monitor each treatment plant for TOC no later than the point of combined filter
effluent turbidity monitoring and representative of the treated water. All
systems required to monitor under this paragraph (1) shall also monitor for TOC
in the source water prior to any treatment at the same time as monitoring for
TOC in the treated water. These samples (source water and treated water) are
referred to as paired samples. At the same time as the source water sample is
taken, all systems shall monitor for alkalinity in the source water prior to
any treatment. Systems shall take one paired sample and one source water
alkalinity sample per month per plant at a time representative of normal
operating conditions and influent water quality.
(2) Reduced monitoring. Surface water systems
with an average treated water TOC of less than 2.0 mg/L for two consecutive
years, or less than 1.0 mg/L for one year, may reduce monitoring for both TOC
and alkalinity to one paired sample and one source water alkalinity sample per
plant per quarter. The system shall revert to routine monitoring in the month
following the quarter when the annual average treated water TOC is greater than
or equal to 2.0 mg/L.
(3)
Compliance shall be determined as specified by
R309-215-13(3).
Systems may begin monitoring to determine whether Step 1 TOC removals can be
met 12 months prior to the compliance date for the system. This monitoring is
not required and failure to monitor during this period is not a violation.
However, any system that does not monitor during this period, and then
determines in the first 12 months after the compliance date that it is not able
to meet the Step 1 requirements in
R309-215-13(2)(b)
and shall therefore apply for alternate minimum TOC removal (Step 2)
requirements, is not eligible for retroactive approval of alternate minimum TOC
removal (Step 2) requirements as allowed pursuant to
R309-215-13(2)(c)
and is in violation. Systems may apply for alternate minimum TOC removal (Step
2) requirements any time after the compliance date. For systems required to
meet Step 1 TOC removals, if the value calculated under
R309-215-13(3)(a)(iv)
is less than 1.00, the system is in violation of the treatment technique
requirements and shall notify the public pursuant to R309-220, in addition to
reporting to the Director pursuant to
R309-105-16.
Notes
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