Small Systems Guide To Safe Drinking Water Act Regulations - U.s. Environmental Protection Agency - 2003 Page 27
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35Monitoring
Treatment
Management Practices
Monitoring for gross alpha, radium-
This rule lists BATs for the removal of
This rule does not directly address
226, radium-228, and uranium fit
radionuclides, should a capital
management practices. However,
into the Standardized Monitoring
investment be required. The BATs
the rule involves new monitoring
Framework (see page 16, chemical
are ion exchange, reverse osmosis,
requirements, which may require
phase rules). Monitoring will be
lime softening, and enhanced
improved management. In addi
required at each entry point to the
coagulation/filtration. The SSCTs
tion, should the installation of a
distribution system. Monitoring for
listed in the radionuclides rule are
treatment process be required,
beta particle and photon emitters is
green sand filtration, co-precipitation
appropriate management prac
not required for most CWSs. If a
with barium sulfate, electrodialysis/
tices may need to be imple
system is designated by the State
electrodialysis reversal, pre-formed
mented.
as “vulnerable” or “contaminated,” it
hydrous manganese oxide filtration,
will have to monitor for beta particle
activated alumina, and POE and POU
and photon radioactivity.
devices, including POU ion exchange
and POU reverse osmosis.
Continuous turbidity monitoring will
Performance standards of conven
Management at those systems
be required for each individual filter
tional and direct filtration plants also
required to comply must establish
(conventional & direct filtration only),
become more strict under this rule.
a Disinfection Profile and Bench-
and values will need to be recorded
Combined filter effluent must be
mark. If a system is considering
every 15 minutes. This is in addition
less than or equal to 0.3 Nephelom
making a significant change in its
to monitoring a combined flow from
etric Turbidity Units (NTU) for 95% of
disinfection practices (for example,
all filters established under the
the monthly readings and may at no
in order to comply with new
SWTR. This will avoid the situation
time exceed 1 NTU.
Disinfection Byproducts Rules), it
where a properly working filter
must get approval from the State.
masks the poor performance of
The State will use the benchmark
another filter, thereby allowing
as a guideline in deciding the level
contaminants to enter the water.
of disinfection that the system will
need to achieve with its new
disinfection practices.
23
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