|(a) Environmental Protection Agency (EPA) registration.
A sanitizer, disinfectant, or other chemical used to treat the water
shall be EPA-registered under the Federal Insecticide, Fungicide,
and Rodenticide Act if it is a pesticide as defined by the EPA.
(b) NSF/ANSI listing. A non-pesticide chemical used
to treat the water shall be listed and labeled to NSF/ANSI Standard
50 or NSF/ANSI Standard 60.
(c) Manufacturer's instructions. Chemicals shall be
used according to the manufacturer's instructions.
(d) Required water quality. Unless the department has
approved an alternate form of disinfectant, water quality shall meet
the following criteria at all times the lagoon is open.
(e) Water clarity. Water clarity shall be sufficient
such that an eight-inch black disk or Secchi Disk on the floor at
the deepest part of the swimming areas of the lagoon can be clearly
and immediately seen by an observer on the water surface above the
disk or by someone standing on the shore closest to the disk.
(f) Swimming area testing frequency.
(1) When a swimming area of a lagoon is open, tests
for sanitizer levels (free available chlorine or bromine) and pH shall
be made in each swimming area at least three times a day. One of the
tests for sanitizer levels and pH shall be made before opening.
(2) Test samples in a swimming area shall be taken
where the water is a minimum of three feet in depth.
(3) Alkalinity and calcium hardness testing frequency.
Unless the department has approved an alternate method of disinfectant
when a lagoon is open, tests for alkalinity shall be performed weekly
and tests for calcium hardness shall be performed monthly in all swimming
areas of the lagoon.
(g) Non-swimming area testing and frequency.
(1) Unless the department has approved an alternate
method of disinfectant when a non-swimming area of a lagoon is open,
tests for sanitizer levels (free available chlorine, bromine) and
pH shall be performed at least three times a day. One of the tests
for sanitizer levels and pH shall be performed before opening.
(2) Test samples in a non-swimming area of the lagoon
shall be taken at a minimum of two locations located on opposite sides
of the lagoon.
(3) Alkalinity testing frequency. Unless the department
has approved an alternate method of disinfectant when a lagoon is
open, tests for alkalinity shall be performed weekly and tests for
calcium hardness shall be performed monthly.
(h) ORP reading frequency. Readings shall be recorded
at the same time sanitizer and pH tests are performed where in-line
ORP meters are used.
(i) Reliable testing methods. A reliable means of testing
for pH, free available chlorine, combined chlorine, cyanuric acid
(if used), bromine, alkalinity, and calcium hardness, shall be maintained
for the lagoon. The test method shall be capable of measuring chemical
ranges as detailed in subsection (d) of this section.
(j) DPD chemical test. Free available chlorine levels
shall be determined by the use of the DPD method or its equivalent.
(k) Storage of test kits and reagents. Test kits and
reagents shall be stored according to the manufacturer's instructions
and protected from extreme heat and cold and from exposure to water,
chemicals, petroleum products or any other element or environment
that could adversely affect the efficacy of water quality test results.
(l) Testing reagents. Testing reagents shall be changed
at frequencies recommended by the manufacturer to ensure accuracy
of the tests.
(m) Chemical balance. Unless an alternate method of
disinfectant has been approved by the department, water in a lagoon
shall be chemically balanced. Testing methods to determine the chemical
balance of the water in the lagoon, such as the Langelier Saturation
Index, shall be conducted once a week at a minimum.
(n) Operation record retention. Operational records,
including results of required chemical testing under this section,
shall be kept for three years and be made available during an inspection.
(o) Off-season chemical levels. When a lagoon is not
in use for at least 30 days (such as off-season), clarity shall be
maintained, and algae growth shall be prevented, however, other water
quality parameters as required in this section need not be maintained.