| (II) The executive director has determined that source
water treatment is not needed and the concentration of lead at all
entry points was less than or equal to 0.005 mg/L and the concentration
of copper at all entry points was less than or equal to 0.65 mg/L
during at least three consecutive years.
(v) A water system that uses a new source of water
is not eligible for reduced entry point monitoring for lead and copper
until concentrations in samples collected from the new source during
three consecutive monitoring periods are below the lead and copper
MPLs.
(vi) Where the results of sampling indicate an exceedance
of a lead or copper MPL, one additional sample must be collected within
two weeks after the initial sample was taken at the same entry point.
Samples will be averaged for compliance determination.
(E) All water systems shall notify the executive director
in writing of any proposed change in treatment or the addition or
deletion of a source of water. The executive director may require
any such system to conduct additional monitoring or to take other
action to ensure that the system maintains minimal levels of corrosion
in the distribution system.
(e) WQP monitoring requirements. Systems shall monitor
WQPs to determine the potential for corrosion. All systems that serve
more than 50,000 people shall monitor in accordance with this subsection.
Systems that serve 50,000 or fewer people that exceed a lead or copper
action level shall monitor in accordance with this subsection, during
the monitoring period in which the system exceeds the action level.
Sites shall be submitted to the executive director for approval in
conjunction with the system's monitoring plan.
(1) WQP monitoring locations. Systems that are required
to monitor WQPs shall take two samples at all entry points and distribution
WQP sites, as specified in subparagraphs (A) and (B) of this paragraph,
where applicable, and at the number of distribution sites shown in
Figure: 30 TAC §290.117(e)(1). Systems on initial or routine
monitoring, as described in paragraph (2) of this subsection, must
sample at the number of sample sites in the column entitled "Initial
and Routine Number of WQP Distribution Sites." Systems on reduced
monitoring must sample at the number of sites in the column entitled
"Reduced Number of WQP Distribution Sites."
Attached Graphic
(A) Entry point WQP sites. Systems that are required
to perform entry point WQP monitoring under this subsection must perform
monitoring at every entry point to the distribution system. The executive
director may allow systems using only groundwater to forego entry
point monitoring, and monitor only at representative distribution
system locations according to paragraph (6) of this subsection.
(B) Distribution WQP sites. Sites normally used for
bacteriological monitoring or other appropriate sites may be used
for WQP sampling. Samples need not be collected inside a customer's
home. These sites shall represent water quality throughout the entire
distribution system.
(2) Initial and routine WQP monitoring. New systems
must perform at least one initial WQP monitoring round in the year
following the year that the system is identified as active. Systems
that exceed lead or copper action levels shall perform two consecutive
six-month periods of routine WQP monitoring. Systems must monitor
in accordance with subparagraphs (A) and (B) of this paragraph.
Attached Graphic
(A) Locations for initial and routine WQP monitoring.
Systems must conduct WQP monitoring at the locations specified in
paragraph (1)(A) and (B) of this subsection, where applicable, and
at the number of distribution sites specified in Figure: 30 TAC §290.117(e)(1).
(B) Frequency of initial and routine WQP monitoring.
Systems serving 50,000 or fewer people shall measure the WQPs listed
in this paragraph during each six-month monitoring period in which
the system exceeds the lead or copper action level. Systems serving
more than 50,000 people must perform two consecutive six-month periods
of sampling. Public water systems shall collect WQP samples on a quarterly
basis as described in Figure: 30 TAC §290.117(e)(2) to reflect
seasonal variability in water quality conditions.
(3) WQP monitoring after installation of corrosion
control treatment. Any system that installs optimal corrosion control
treatment as required by subsection (f) of this section shall measure
the list of WQPs at the locations and frequencies as specified in
Figure: 30 TAC §290.117(e)(3). Any system serving more than 50,000
people that installs optimal corrosion control treatment shall monitor
once during each six-month period. Any system serving 50,000 or fewer
people that installs corrosion control treatment shall monitor during
each six-month monitoring period specified in which the system exceeds
the lead or copper action level.
Attached Graphic
(A) Frequency of WQP monitoring after installation
of corrosion control treatment. After a system installs corrosion
control treatment, it must collect least one sample every two weeks
(biweekly) at every entry point to the distribution system, except
as provided under paragraph (6) of this subsection.
(B) Documentation for WQP sample locations after installation
of corrosion control treatment. Prior to the starting date of the
monitoring period for any monitoring under this paragraph, the system
shall provide the executive director with an updated list of entry
points and their sources, a list of distribution sites, and information
on seasonal variability of water usage to demonstrate that the sites
are representative of water quality and treatment conditions throughout
the system. The system shall submit this information to the executive
director upon request or when circumstances change and retain a copy
of the submittal and approval with the system's monitoring plan.
(C) Additional monitoring when determining optimal
corrosion control treatment. The executive director may require the
system to conduct additional WQP monitoring in to assist in evaluating
the system's sample sites.
(4) WQP monitoring after designation of OWQP ranges.
After the executive director approves OWQP ranges, systems shall measure
the list of WQPs at the frequency and locations as described in Figure:
30 TAC §290.117(e)(4).
Attached Graphic
(A) After the executive director approves OWQP ranges,
systems serving more than 50,000 people shall measure the WQPs listed
in this paragraph and determine compliance with the OWQP ranges quarterly
starting with the first six-month period after the executive director
specifies the OWQPs beginning on either January 1 or July 1, whichever
comes first.
(B) Any system serving 50,000 or fewer people shall
conduct WQP monitoring during each six-month period specified in this
paragraph in which the system exceeds the lead or copper action level.
If the system is eligible for reduced lead and copper tap sampling,
the system shall collect WQPs during the same monitoring periods that
it collects lead and copper tap samples.
(C) The system shall complete follow-up sampling within
36 months after the executive director designates optimal corrosion
control treatment.
(D) Systems shall measure WQPs at every entry point
to the distribution system, except as allowed under paragraph (6)
of this subsection.
(5) Reduced WQP monitoring. The executive director
may reduce monitoring for systems that demonstrate a low risk of corrosion
of lead and copper into the drinking water. Water systems on reduced
schedules shall monitor the list of WQPs at the locations and frequency
given in the table entitled "Reduced Water Quality Parameter (WQP)
Entry Point and Distribution Monitoring."
Attached Graphic
(A) Reduced quarterly WQP distribution monitoring.
A system that operates within approved OWQP ranges in all samples
taken during two consecutive six-month initial or routine monitoring
periods under paragraph (2) of this subsection may collect tap samples
for applicable WQPs from the reduced number of sites quarterly. A
water system sampling quarterly shall collect samples evenly throughout
the year so as to reflect seasonal variability.
(B) Reduced annual WQP distribution monitoring. Any
water system that operates within approved OWQP ranges during three
consecutive years of quarterly monitoring may reduce the frequency
with which it collects distribution WQP samples to annually. Annual
WQP sampling shall begin during the calendar year immediately following
the end of the monitoring period in which the third consecutive year
of quarterly monitoring occurs. A water system sampling annually shall
collect samples evenly throughout the year so as to reflect seasonal
variability.
(C) Reduced triennial WQP distribution monitoring.
The executive director may reduce the WQP monitoring frequency to
once every three years if a system meets the criteria of this subparagraph.
Triennial monitoring shall be done no later than every third calendar
year.
Cont'd... |
