Ohio Admin. Code 3745-81-43 - Ground water rule - compliance monitoring requirements for ground water systems
(A) Compliance monitoring.
(1) A ground water system that is not
required to meet the source water monitoring requirements of rule
3745-81-42 of the Administrative
Code because the system provides at least 4-log treatment of viruses (using
inactivation, removal, or a director -approved combination of 4-log virus
inactivation and removal) before or at the first customer for the ground water
source shall comply with the following requirements:
(a) The system shall notify the director in
writing that it provides at least 4-log treatment of viruses (using
inactivation, removal, or a director -approved combination of 4-log virus
inactivation and removal) before or at the first customer for the ground water
source . Notification to the director shall include engineering, operational, or
other information that the director requests to evaluate the submission. The
notification may also require a complete plan approval application in
accordance with Chapter 3745-91 of the Administrative Code.
(b) The system shall obtain acceptance or
approval from the director for 4-log treatment of viruses.
(c) The system shall conduct compliance
monitoring as required in paragraph (A)(2) of this rule within thirty days of
placing the source in service or receiving director approval for 4-log
treatment of viruses.
(d) The
system shall conduct ground water source monitoring in accordance with rule
3745-81-42 of the Administrative
Code if the system subsequently discontinues 4-log treatment of viruses (using
inactivation, removal, or a director -approved combination of 4-log virus
inactivation and removal) before or at the first customer for the ground water
source .
(2) Monitoring
requirements. A ground water system subject to the requirements of paragraph
(A)(1) of this rule or requirements in rule
3745-81-61 of the Administrative
Code, shall monitor the effectiveness and reliability of treatment for that
ground water source before or at the first customer as follows:
(a) Chemical disinfection .
(i) For a system providing disinfection
treatment only, the disinfection treatment shall be considered sufficient if
the total treatment processes of that public water system would consistently
and reliably achieve at least 99.99 per cent (4-log) inactivation of viruses,
as determined from tables B-7, B-9, B-11 and B-13 of rule
3745-81-72 of the Administrative
Code.
(ii) Treatment technique
requirements are used to ensure control of viruses in drinking water. Tables
B-7, B-9, B-11 and B-13 of rule
3745-81-72 of the Administrative
Code shall be used to determine the sufficiency of disinfection for this
rule.
(iii) The level of
disinfection being provided by the system is determined by measuring actual CT
values. Actual CT values are obtained by multiplying the residual disinfectant ,
C, by the disinfection contact time , T, giving the resultant, CT. The value of
C in milligrams per liter is determined at a point before or at the first
customer. The value of T in minutes is based on the time available for the
disinfectant to work from the point at which it is added to the water until the
point at which C is measured. Values of T are determined based on the approved
effective volume factor of the clearwell or contact tank including T for the
conduit before the first customer. It may be appropriate to determine the value
of C at more than one point of the water treatment flow, with the T associated
with each C being estimated from the previous measurement point or the previous
addition of disinfectant , whichever is closer. If more than one disinfectant
concentration point is used, the products of each C and its associated T are
added and the sum of these products is the actual CT value to compare with the
appropriate value of the required minimum CT values for specified conditions
and levels of inactivation. Note that any disinfection after the last
determination of C is not included in the actual CT value. Minimum required CT
values for inactivation of viruses by disinfection in relation to the
disinfectant , the extent of inactivation, the lowest disinfectant
concentration, the pH, and the water temperature are found in tables B-7, B-9,
B-11 and B-13 of rule
3745-81-72 of the Administrative
Code.
(iv) In tables B-7, B-9, B-11
and B-13 of rule
3745-81-72 of the Administrative
Code, the required CT between the indicated temperatures, pH or residual
disinfectant concentrations may be determined by linear interpolation. If no
interpolation is used, then the required CT shall be determined at the lower
temperature, and at the higher pH. If no interpolation is used, for virus
inactivation at a pH greater than nine, the required CT shall be the same as
the required CT at a pH equal to ten.
(v) On each day when the actual CT value
meets or exceeds the required minimum CT value in or linearly interpolated from
tables B-7, B-9, B-11 and B-13 of rule
3745-81-72 of the Administrative
Code, then the water treatment plant is considered to be satisfying this rule's
treatment technique requirements for disinfection of ground water sources. On
each day when the actual CT value does not meet or exceed the required minimum
CT value from tables B-7, B-9, B-11 and B-13 of rule
3745-81-72 of the Administrative
Code, then the water treatment plant is in violation of paragraph (A)(2)(a)(i)
of this rule if the CT value is not restored within four hours.
(vi) For each clearwell, or contact tank, the
approved effective volume factor shall be determined by the director based upon
its design characteristics including: the average flow path length to channel
width ratio; baffling; and the proximity of the outlet to the inlet using
figures B-1 and B-2 of rule
3745-81-72 of the Administrative
Code. The approved effective volume factor shall be the preliminary effective
volume factor obtained from figure B-1 multiplied by the reduction factor
obtained from figure B-2, rounded down to the nearest 0.05. A public water
system may request that the director approve an effective volume factor that
was determined by tracer studies, hydraulic analysis or modeling, or an
equivalent demonstration. For a tracer study to be acceptable, the net
advection of the tracer shall be within ten per cent of the change in the
tracer chemical storage within the clearwell system. Net advection means the
amount of tracer convected out of the clearwell system minus the amount of
tracer convected into the clearwell system over the duration of the tracer
study.
(vii) Public water systems
serving greater than three thousand three hundred people shall continuously
monitor the residual disinfectant concentration of the water at a location
approved by the director and the lowest value shall be recorded each day. If
there is a failure in the continuous disinfectant monitoring equipment, the
public water system shall conduct grab sampling every four hours in lieu of
continuous monitoring until the continuous monitoring equipment is repaired and
returned to service. A public water system has no more than five days after
failure of the equipment to repair the continuous monitoring equipment and
return it to service.
(viii) Public
water systems serving three thousand three hundred or fewer people shall
monitor the residual disinfectant concentration at a location approved by the
director , and record the residual disinfection concentration each day that
water from the ground water source is served to the public. The public water
system shall take a daily grab sample during the hour of peak flow or at
another time specified by the director . If the actual residual disinfectant
concentration value falls below the required minimum specified by the director ,
the ground water system shall take follow-up samples every four hours until the
actual disinfectant residual is restored to the director -determined minimum
value. Alternatively, a ground water system that serves three thousand three
hundred or fewer people may monitor continuously and meet the requirements of
paragraph (A)(2)(a)(vii) of this rule.
(ix) Other parameters necessary to determine
the sufficiency of disinfection prior to the first customer shall be measured
and recorded.
(b)
Membrane filtration . A ground water system that uses membrane filtration to
meet the requirements of this subpart shall monitor the membrane filtration
process in accordance with all director -specified monitoring requirements and
shall operate the membrane filtration in accordance with all director -specified
compliance requirements. A ground water system that uses membrane filtration is
in compliance with the requirement to achieve at least 4-log removal of viruses
when the following conditions exist:
(i) The
membrane has an absolute molecular weight cut-off or an alternate parameter
that describes the exclusion characteristics of the membrane, that can reliably
achieve at least 4-log removal of viruses.
(ii) The membrane process is operated in
accordance with director -specified compliance requirements.
(iii) The integrity of the
test
membrane
is intact.
(c)
Alternative treatment. A ground water system that uses a director -approved
alternative treatment to meet the requirements of this rule by providing at
least 4-log treatment of viruses (using inactivation, removal, or a
director -approved combination of 4-log virus inactivation and removal) before
or at the first customer shall comply with the following:
(i) Monitor the alternative treatment in
accordance with all director -specified monitoring requirements.
(ii) Operate the alternative treatment in
accordance with all compliance requirements that the director determines to be
necessary to achieve at least 4-log treatment of viruses.
(B) Discontinuing
treatment. A ground water system may discontinue 4-log treatment of viruses
(using inactivation, removal, or a director -approved combination of 4-log virus
inactivation and removal) before or at the first customer for a ground water
source if the director determines and documents in writing that 4-log treatment
of viruses is no longer necessary for that ground water source . A system that
discontinues 4-log treatment of viruses is subject to the source water
monitoring and analytical methods requirements in rule
3745-81-42 of the Administrative
Code.
(C) Failure to meet the
monitoring requirements of paragraph (A) of this rule is a monitoring violation
and requires the ground water system to provide public notification in
accordance with rule
3745-81-32 of the Administrative
Code.
Notes
Promulgated Under: 119.03
Statutory Authority: 6109.04
Rule Amplifies: 6109.03, 6109.04
Prior Effective Dates: 10/31/2010, 04/01/2016
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