Ohio Admin. Code 3745-81-82 - Control of lead and copper; description of corrosion control treatment requirements
Each
(A) Small public water system
recommendation regarding corrosion control treatment. Based upon the results of
lead and copper tap monitoring and water quality parameter monitoring, small
water systems exceeding the lead or copper action level shall recommend
installation of and submit plans for one or more of the corrosion control
treatments listed in paragraph (C)(1) of this rule which the system believes
constitute optimal corrosion control for that system. The director may require
the small system to conduct additional water quality parameter monitoring in
accordance with paragraph (B) of rule
3745-81-87 of the Administrative
Code to assist the director in reviewing the system's recommendation.
(B) Studies of corrosion control treatment by
small and medium systems. The director may require any small system that
exceeds the lead or copper action level to perform corrosion control studies
under paragraph (C) of this rule to identify optimal corrosion control
treatment for the system. Any medium system that exceeds the lead or copper
action level shall perform corrosion control studies under paragraph (C) of
this rule in order to identify optimal corrosion control treatment for the
system.
(C) Performance of
corrosion control studies.
(1) Any public
water system performing corrosion control studies shall evaluate the
effectiveness of each of the following treatments and, if appropriate,
combinations of the following treatments to identify the optimal corrosion
control treatment for that system:
(a)
Alkalinity and pH adjustment;
(b)
Calcium hardness adjustment; and
(c) The addition of a phosphate-based or
silicate-based corrosion inhibitor at a concentration sufficient to maintain an
effective residual concentration in all test tap samples.
(2) The water system shall evaluate each of
the corrosion control treatments using either pipe rig/loop tests, metal coupon
tests, partial-system tests, or analyses based on documented analogous
treatments with other systems of similar size, water chemistry, and
distribution system configuration.
(3) The water system shall measure the
following water quality parameters in any tests conducted under this paragraph
before and after evaluating the corrosion control treatments listed above:
(a) Lead;
(b) Copper;
(c) pH;
(d) Alkalinity;
(e) Calcium;
(f) Conductivity;
(g) Orthophosphate (when an inhibitor
containing a phosphate compound is used);
(h) Silicate (when an inhibitor containing a
silicate compound is used); and
(i)
Water temperature.
(4)
The water system shall identify all chemical or physical constraints that limit
or prohibit the use of a particular corrosion control treatment and document
such constraints with at least one of the following:
(a) Data and documentation showing that a
particular corrosion control treatment has adversely affected other water
treatment processes when used by another water system with comparable water
quality characteristics; and/or
(b)
Data and documentation demonstrating that the water system has previously
attempted to evaluate a particular corrosion control treatment and has found
that the treatment is ineffective or adversely affects other water quality
treatment processes.
(5)
The water system shall evaluate the effect of the chemicals used for corrosion
control treatment on other water quality treatment processes.
(6) On the basis of an analysis of the data
generated during each evaluation, the water system shall recommend to the
director in writing the treatment option that the corrosion control studies
indicate constitutes optimal corrosion control treatment for that system, and
submit approvable plans therefor in accordance with Chapter 3745-91 of the
Administrative Code. The water system shall provide a rationale for its
recommendation along with all supporting documentation specified in paragraphs
(C)(1) to (C)(5) of this rule.
(D) Director approval of optimal corrosion
control treatment plans.
(1) Based upon
consideration of available information, including, where applicable, studies
performed under paragraph (C) of this rule and a system's recommended treatment
alternative, the director shall review the corrosion control treatment plan
submitted by the system. When reviewing the submitted optimal treatment plan
the director shall consider the effects that additional corrosion control
treatment will have on water quality parameters and on other water quality
treatment processes.
(2) The
director shall notify the system of the decision on the optimal corrosion
control treatment plan in writing and explain the basis for this determination.
If the director requests additional information to aid the review, the water
system shall provide the information.
(E) Installation of optimal corrosion
control. Each public water system shall properly install and operate throughout
its distribution system the optimal corrosion control treatment approved by the
director under paragraph (D) of this rule.
(F) Director review of treatment and
specification of optimal water quality control parameters. The director shall
evaluate the results of all lead and copper tap monitoring and water quality
parameter monitoring submitted by the public water system and determine whether
the system has properly installed and operated the optimal corrosion control
treatment plan approved by the director in paragraph (D) of this rule. Upon
reviewing the results of tap water and water quality parameter monitoring by
the system, both before and after the system installs optimal corrosion control
treatment, the director shall specify values for the applicable water quality
control parameters listed in paragraphs (F)(1) to (F)(5) of this rule to
reflect optimal corrosion control treatment for the system. The director may
specify values for additional water quality control parameters determined by
the director to reflect optimal corrosion control for the system. The director
shall notify the system in writing of these determinations and explain the
basis for the decisions. Common water quality control parameters include:
(1) A minimum value or a range of values for
pH measured at each entry point to the distribution system;
(2) A minimum value for pH measured in all
tap samples taken for water quality parameter determinations. Such value shall
be equal to or greater than 7.0, unless the director determines that meeting a
pH level of 7.0 is not technologically feasible or is not necessary for the
system to optimize corrosion control;
(3) If a corrosion inhibitor is used, a
minimum concentration or a range of concentrations for the inhibitor, measured
at each entry point to the distribution system and in all tap samples, that the
director determines is necessary to form a passivating film on the interior
walls of the pipes of the distribution system;
(4) If alkalinity is adjusted as part of
optimal corrosion control treatment, a minimum concentration or a range of
concentrations for alkalinity, measured at each entry point to the distribution
system and in all tap samples; and
(5) If calcium carbonate stabilization is
used as part of corrosion control, a minimum concentration or range of
concentrations for calcium, measured in all tap samples.
(G) Continued operation and monitoring. All
public water systems optimizing corrosion control shall continue to operate and
maintain optimal corrosion control treatment, including maintaining water
quality parameters at or above minimum values or within ranges designated by
the director under paragraph (F) of this rule, in accordance with this
paragraph for all samples collected under paragraphs (D) to (F) of rule
3745-81-87 of the Administrative
Code. Compliance with the requirements of this paragraph shall be determined
every six months, as specified under paragraph (D) of rule
3745-81-87 of the Administrative
Code. A water system is out of compliance with the requirements of this
paragraph for a six-month period if it has excursions for any
director -specified parameter on more than nine days during the period. An
excursion occurs whenever the daily value for one or more of the water quality
parameters measured at the sampling location is below the minimum value or
outside the range designated by the director . Daily values are calculated as
follows. The director has discretion to delete results of obvious sampling
errors from this calculation.
(1) On days
when more than one measurement for the water quality parameter is collected at
the sampling location, the daily value shall be the average of all results
collected during the day regardless of whether they are collected through
continuous monitoring, grab sampling, or a combination of both.
(2) On days when only one measurement for the
water quality parameter is collected at the sampling location, the daily value
shall be the result of that measurement.
(3) On days when no measurement is collected
for the water quality parameter at the sampling location, the daily value shall
be the daily value calculated on the most recent day on which the water quality
parameter was measured at the site.
(H) Modification of the director 's treatment
decisions. Upon the director 's own initiative or in response to a request by a
public water system , the director may modify the approval of the optimal
corrosion control treatment plans under paragraph (D) of this rule or optimal
water quality control parameters under paragraph (F) of this rule. A request
for modification by a system shall be in writing, explain why the modification
is appropriate, and provide supporting documentation. The director may modify
the approval where the director concludes that such change is necessary to
ensure that the system continues to optimize corrosion control treatment. A
revised approval shall be made in writing, set forth the new treatment
requirements, explain the basis for the director 's decision, and provide an
implementation schedule for completing the treatment modifications.
Notes
Promulgated Under: 119.03
Statutory Authority: 6109.04
Rule Amplifies: 6109.04
Prior Effective Dates: 09/13/1993, 10/17/2003, 07/24/2009
Promulgated Under: 119.03
Statutory Authority: 6109.04
Rule Amplifies: 6109.04, 6109.03
Prior Effective Dates: 09/13/1993, 10/17/2003, 07/24/2009
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