Small Systems Guide To Safe Drinking Water Act Regulations - U.s. Environmental Protection Agency - 2003 Page 31
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35Monitoring
Treatment
Management Practices
Under the proposed rule, an Initial
This proposed rule may directly cause
This proposed rule does not
Distribution System Evaluation
changes in treatment.
Systems may
, in
directly address management
(IDSE) will determine where the new
order to reduce DBP concentrations in
practices.
However
, should
monitoring sites will be located. The
the distribution system, need to make
the installation of a new
monitoring schedule would be
operational changes or distribution
treatment technology or
based on both source water type and
system modifications, use alternative
distribution system modifica
system size. Compliance monitoring
disinfection strategies, enhance DBP
tions be required, some
would come in two phases:
precursor removal, and/or remove
management practices may
Phase 1: All phase 1 monitoring is
DBPs.
be affected.
conducted at the same monitoring
sites used to comply with the Stage
1 DBPR.
Phase 2: Monitoring must be
conducted at the new sites deter-
mined by the IDSE.
Note: Monitoring takes place at the
Depending on the initial monitoring
This proposed rule does not
source prior to treatment.
results, systems that filter would be put
directly address management
into groups or “bins.” Under the
practices. However, should the
For SMALL systems (serving fewer
proposed rule, each bin (except the bin
installation of new treatment
than 10,000 persons): Under the
for the lowest levels) requires a system
technology or the adoption of
proposed rule, Cryptosporidium
to install a treatment technology and
new treatment options be
monitoring would be required if E.
sets a monitoring schedule, both
required, some management
coli annual mean concentrations
based on contamination levels in the
practices may be affected.
reach certain levels. (EPA is trying to
source water. Under the proposed rule,
reduce the burden to small systems
some new treatment options could
by allowing the less expensive E.
possibly involve watershed control,
coli monitoring to take place first,
reducing influent Cryptosporidium
and then only requiring the more
concentrations, improving system
expensive Cryptosporidium monitor
performance, and additional treatment
ing when levels signal there may be
barriers such as pretreatment.
a problem.)
27
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