| (iii) The executive director will determine if the
public water system has identified the likely cause(s) of the trigger
and, if so, was the cause(s) corrected, or has an acceptable schedule
to correct the problem been included. The assessments may also indicate
that no sanitary defects were identified.
(D) A public water system shall ensure that a Level
2 assessment and the executive director-approved Level 2 assessment
form are conducted and completed consistently with all directives
set forth by the executive director if the public water system exceeds
one of the treatment technique triggers in paragraph (2) of this subsection.
The public water system shall comply with any expedited actions or
additional actions required by the executive director in the case
of an E. coli MCL violation.
(i) After any trigger in paragraph (2) of this subsection,
the public water system shall ensure that both the Level 2 assessment
and the executive director-approved Level 2 assessment form are completed
by the public water system, licensed operators as required under §290.46(e)
of this title, or by parties approved by the executive director and
the completed form submitted to the executive director as soon as
practical but no later than 30 days after the public water system
learns that it has exceeded a trigger in paragraph (2) of this subsection,
or 30 days after all routine and repeat monitoring was required to
be completed for the calendar month in which the system exceeded the
trigger, whichever is earlier.
(ii) If the executive director determines that the
completed Level 2 assessment is not sufficient or the proposed timetable
for any corrective actions not completed is not sufficient, the public
water system shall consult with the executive director. If any revisions
are required after consultation, the public water system shall submit
a revised assessment form to the executive director within 30 days
from the date of the consultation.
(iii) After the Level 2 assessment is submitted, the
executive director will determine if the public water system has identified
the likely cause(s) of the trigger and corrected the cause(s), or
has included an acceptable timetable for correcting the cause(s).
The assessments may also indicate that no sanitary defects were identified.
(E) Public water systems must correct sanitary defects
found through either Level 1 or Level 2 assessments described in this
subsection. For corrective actions not completed by the time of submission
of the assessment form, the public water system must complete the
corrective actions in compliance with a timetable approved by the
executive director in consultation with the public water system. The
public water system must notify the executive director when scheduled
corrective actions have been completed.
(F) At any time during the assessment or corrective
action phase, either the public water system or the executive director
may request a consultation with the other party to determine the appropriate
actions. The public water system shall consult with the executive
director on all relevant information that may impact its ability to
comply with a requirement of this subsection.
(d) Monitoring requirements for microbial contaminants.
Public water systems shall collect samples for total coliform, fecal
coliform, E. coli (or other approved
fecal indicator) at sampling sites and a sample collection schedule,
as designated by the public water system, which are subject to review
and revision as directed by the executive director. All compliance
samples must be collected at sampling sites and a sample collection
schedule that are representative of water throughout the distribution
system and shall be reflected in the public water system's Sample
Siting Plan and included with the public water system's monitoring
plan in accordance with §290.121 of this title (relating to Monitoring
Plans). All public water systems shall develop a written Sample Siting
Plan as described in paragraph (6) of this subsection.
(1) Routine microbial sampling locations. Public water
systems shall routinely monitor for microbial contaminants at the
following locations.
(A) Public water systems must collect routine distribution
coliform samples at a customer's premise, dedicated sampling station,
or other designated compliance sampling location at active service
connections which are representative of water quality throughout the
distribution system. Other sampling sites may be used if located adjacent
to active service connections.
(B) Public water systems shall collect distribution
coliform samples at locations specified in the public water system's
Sample Siting Plan which shall be included in the public water system's
monitoring plan.
(2) Routine distribution coliform sampling frequency.
All public water systems must sample for distribution coliform at
the following frequency.
(A) Community and noncommunity public water systems
must collect routine distribution coliform samples at a frequency
based on the population served by the system.
(i) The population for noncommunity systems will be
based on the maximum number of persons served on any given day during
the month based on the data reported by the public water system to
the executive director during the most recent sanitary survey of the
public water system or any other data as required by the executive
director.
(ii) The population of community systems will be based
on the data reported by the public water system to the executive director
during the most recent sanitary survey of the public water system
or any other data as required by the executive director.
(iii) The minimum sampling frequency for public water
systems is shown in the following table.
Attached Graphic
(B) A public water system which uses surface water
or groundwater under the direct influence of surface water must collect
routine distribution coliform samples at regular time intervals throughout
the month.
(C) A public water system which uses only purchased
water or groundwater not under the direct influence of surface water
and serves more than 4,900 persons must collect routine distribution
coliform samples at regular time intervals throughout the month.
(D) A public water system which uses only purchased
water or groundwater not under the direct influence of surface water
and serves 4,900 persons or fewer may collect all required routine
distribution coliform samples on a single day if they are taken from
different sites.
(E) A total coliform-positive sample invalidated under
this subsection does not count towards meeting the minimum routine
monitoring requirements of this subsection. Unless the executive director
has invalidated the sample in accordance with subsection (e) of this
section, all routine coliform sample results must be used to determine
compliance with subsection (b)(1) of this section and to determine
treatment technique trigger and assessment requirements as described
in subsection (c)(1) and (2) of this section.
(F) All public water system shall collect at least
the minimum number of required routine microbial samples even if the
public water system has had an E. coli MCL
violation under any of the conditions as described in subsection (b)(1)(A)
- (D) of this section or has exceeded the coliform treatment technique
triggers as described in subsection (c)(1) and (2) of this section.
(G) A public water system may conduct more microbial
compliance monitoring than is required by this subsection to investigate
potential problems in the public water system treatment facilities
and distribution system and use monitoring to assist in identifying
problems. A public water system may collect more than the minimum
number of required routine samples required by this subsection. A
public water system that collects more than the minimum number of
required routine samples required by this subsection shall include
the results of these samples in calculating whether the coliform treatment
technique triggers as described in subsection (c)(1) and (2) of this
section have been exceeded. The additional routine sample sites shall
be included in the public water system's Sample Siting Plan and collected
in accordance with the Sample Siting Plan and shall be representative
of water throughout the distribution system.
(3) Repeat distribution coliform sampling requirements.
Public water systems shall conduct repeat monitoring if one or more
of the routine samples is found to contain coliform organisms.
(A) If a routine distribution coliform sample is coliform-positive,
the public water system must collect a set of repeat distribution
coliform samples within 24 hours of being notified of the positive
result, or as soon as possible if the local laboratory is closed.
The executive director may extend the 24-hour limit on a case-by-case
basis if the public water system has a logistical problem in collecting
the repeat samples within 24 hours that is beyond the public water
system's control. All public water systems shall collect no fewer
than three repeat samples for each total coliform-positive sample
found even if the public water system has had an E. coli Cont'd... |
