South Carolina Code of Regulations
Chapter 61 - DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL
Subchapter 61-58.2 - Groundwater Sources and Treatment
Section 61-58.2.E - Chemical Application
Universal Citation: SC Code Regs 61-58.2.E
Current through Register Vol. 48, No. 9, September 27, 2024
(1) General--No chemical shall be applied to treat drinking waters unless specifically permitted by the Department. A certified operator is required whenever the chemical or physical characteristics of the water is changed.
(a) Plans and specifications--Plans and
Specifications shall be submitted for review and approval, as required by in
R.61-58.1, and shall include:
(i) Descriptions of feed equipment, including
maximum and minimum feed ranges and pump curves for solution feeders,
(ii) Location of feeders, piping layout and
points of chemical application,
(iii) Storage and handling
facilities;
(iv) Specifications for
chemicals to be used;
(v) Operating
and control procedures including proposed application rates;
(vi) Descriptions of testing equipment and
procedures; and,
(vii) Locations of
sampling taps for testing.
(b) Chemical application--Chemicals shall be
applied to the water at such points and by such means as to:
(i) Provide maximum efficiency of
treatment;
(ii) Ensure maximum
safety to consumer;
(iii) Provide
maximum safety to operators;
(iv)
Ensure satisfactory mixing of the chemicals with the water;
(v) Provide maximum flexibility of operation
through various points of application, when appropriate;
(vi) Prevent backflow or back-siphonage
between multiple points of feed through the use of separate feed equipment for
each point and backflow preventers where a manifold system is used for standby,
multiple feed use;
(vii) Not be
located upstream of the metering device when the chemical in consideration will
interfere with the flow measurement;
(viii) Provide a separate injection point and
a separate feed line for each chemical application that is added and, spacing
to prevent inter-reaction of chemicals; and,
(ix) Provide chemical injection points which
are readily accessible. All below-grade injection points shall be housed in a
vault or similar structure.
(c) General equipment design--General
equipment design shall be such that:
(i)
Chemical-contact materials and surfaces are corrosion resistant;
(ii) Corrosive chemicals are introduced in
such a manner as to minimize potential for corrosion; and,
(iii) Chemicals that are incompatible are not
fed, stored or handled together.
(2) Facility Design
(a) Chemical feeders--
(i) A separate feeder shall be used for each
separate chemical applied, and for each injection point.
(ii) Spare parts shall be available for all
feeders to replace parts which are subject to wear and damage.
(iii) Dry chemical feeders shall:
(A) Measure chemicals volumetrically or
gravimetrically;
(B) Provide
adequate solution water and agitation of the chemical in the solution
pot;
(C) Provide gravity feed from
solution pots; and,
(D) Completely
enclose chemicals to prevent emission of dust to the operating room.
(iv) Chemical feed equipment,
where necessary, shall be located in a separate room to reduce hazards and dust
problems; shall be conveniently located near points of application to minimize
length of feed lines; and, shall be readily accessible for servicing, repair,
and observation of operation.
(v)
Feeders shall be able to supply, at all times, the necessary amounts of
chemicals at an accurate rate;
(b) Control--
(i) Feeders with automatic controls shall be
designed so as to allow override by manual controls.
(ii) Chemical feed rates shall be
proportional to flow.
(iii) Meters,
scales, calibration columns, or other acceptable means to measure chemicals
being fed must be provided in order to determine chemical feed rates.
(iv) Provisions shall be made for measuring
the quantities of chemicals used.
(c) Cross-connection control--
(i) Cross-connection control shall be
provided to ensure that liquid chemical solutions cannot be siphoned through
solution feeders into the water supply.
(ii) The service water lines discharging to
the solution tanks shall be properly protected from backflow as required by the
Department.
(iii) No direct
connection shall exist between any sewer and a drain or overflow from the
feeder, solution chamber or tank. All drains shall terminate at least six (6)
inches or two (2) pipe diameters, whichever is greater, above the overflow rim
of a receiving sump, conduit or waste receptacle.
(d) Service water supply shall be ample in
supply and adequate in pressure; shall be provided with means for measurement
when preparing specific solution concentrations by dilution; shall be properly
treated potable water; and shall be properly protected against
backflow.
(e) Storage of
chemicals--
(i) Space shall be provided for
at least three (3) days of chemical supply and provide for convenient,
efficient and safe handling of chemicals. Dry storage conditions must be
maintained for dry chemicals.
(ii)
Storage tanks and pipelines for liquid chemicals shall be designed specifically
for each chemical used.
(iii)
Chemicals shall be stored in covered or unopened shipping containers, unless
the chemical is transferred into an approved covered storage unit.
(f) Solution tanks--
(i) A means which is consistent with the
nature of the chemical solution shall be provided in a solution tank to
maintain a uniform strength of solution. Continuous agitation shall be provided
to maintain slurries in suspension.
(ii) Means shall be provided to measure the
solution level in the tank.
(iii)
Chemical solutions shall be kept covered. Large tanks with access openings
shall have such openings curbed and fitted with tight overhanging
covers.
(iv) Overflow pipes, when
provided, shall:
(A) Be turned downward, with
the end screened;
(B) Have an air
gap of two (2) pipe diameters or six (6) inches, whichever is greater;
and,
(C) Be located where
noticeable.
(v) Acid
storage tanks shall be vented independently to the outside
atmosphere.
(vi) Each tank shall be
provided with a valved drain, protected against backflow in accordance with
R.61-58.2(E)(2)(c)(iii)(E)(2)(c)(iii).
(g) Feed lines--
(i) Feed lines shall be as short as possible
in length of run, and of durable, corrosion resistant material. They shall be
easily accessible throughout the entire length, protected against freezing, and
readily cleanable;
(ii) Feed lines
shall be designed consistent with scale-forming or solids depositing properties
of the water, chemical, solution or mixture conveyed;
(iii) Feed lines shall be color coded and
labeled; and,
(iv) Where lime is
added, a spare feed line equal in length to the longest run of feed line, shall
be provided.
(h)
Handling--
(i) Provisions shall be made for
disposing of empty bags, drums or barrels by an approved procedure which will
minimize exposure to dust.
(ii)
Provision shall be made for the proper transfer of dry chemicals from shipping
containers to storage bins or hoppers, in such a way as to minimize the
quantity of dust which may enter the room in which the equipment is
installed.
(iii) Provision shall be
made for measuring quantities of chemicals used to prepare feed
solutions.
(i) Housing--
(i) Floor surfaces shall be smooth,
impervious, slip-proof and well-drained.
(ii) Vents from feeders, storage facilities
and equipment exhaust shall discharge to the outside atmosphere above grade and
remote from air intakes.
(iii)
Feeders used in conjunction with dry lime or carbon shall be housed in
separate, individual rooms equipped with dust control systems.
(iv) Sufficient lighting for operator safety
and sufficient heating to provide for proper operation of the chemical feed
equipment shall be provided for all chemical feed rooms.
(3) Chemicals Specifications--All chemicals and products added to a public water supply as part of the treatment process shall be certified as meeting the specifications of the American National Standards Institute/National Sanitation Foundation Standard 60, Drinking Water Treatment Chemicals--Health Effects. The certifying party shall be accredited by the American National Standards Institute.
Disclaimer: These regulations may not be the most recent version. South Carolina may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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