25 Pa. Code § 109.602 - Acceptable design
(a) A public
water system shall be designed to provide an adequate and reliable quantity and
quality of water to the public. The design must ensure that the system will,
upon completion, be capable of providing water that complies with the primary
and secondary MCLs, MRDLs and treatment techniques established in Subchapters
B, K, L and M except as further provided in this section.
(1) The Department may approve control
techniques such as nonremoval processes, which abate the problems associated
with a secondary contaminant and achieve the objective of the secondary
MCL.
(2) The Department may approve
a design which may cause an exceedance of a secondary MCL if the exceedance
directly results from a treatment method used to achieve compliance with a
primary MCL, the level of the secondary contaminant in the finished water does
not represent an unreasonable risk to health nor otherwise adversely affect the
normal uses of the finished water.
(b) Designs of public water facilities shall
conform to accepted standards of engineering and design in the water supply
industry and shall provide protection from failures of source, treatment,
equipment, structures or power supply.
(c) The Department's Public Water
Supply Manual sets forth design standards which the Department finds
to be acceptable designs. Other designs may be approved by the Department if
the applicant demonstrates the alternate design is capable of providing an
adequate and reliable quantity and quality of water to the public.
(d) Filtration facilities permitted after May
16, 1992, unless otherwise authorized under
109.507
(relating to permits for innovative technology), shall be designed to include
individual sampling ports or turbidimeters on the raw source water line, on the
influent line to the filters and on the effluent lines for each filter
bed.
(e) Point-of-use devices which
are treatment devices applied to a single tap are not an acceptable treatment
method for complying with an MCL, MRDL or treatment technique
requirement.
(f) A public water
system that provides filtration of surface water or GUDI sources must be
equipped with alarm capabilities that meet the requirements of subsection (i)
by August 19, 2019. The Department may approve in writing an alternate
compliance schedule if the water supplier submits a written request with
supporting documentation by August 19, 2019.
(g) A public water system that provides
filtration of surface water or GUDI sources and that is not staffed
continuously while the plant is operating must be equipped with alarm and
shutdown capabilities that meet the requirements of subsection (i) by August
19, 2019. The Department may approve in writing an alternate compliance
schedule if the water supplier submits a written request with supporting
documentation by August 19, 2019.
(h) In addition to public water systems
covered under subsection (f) or (g), the Department may require a public water
system to meet the requirements of subsection (i), according to a schedule set
forth in a permit or order issued by the Department.
(i) Alarm and shutdown capabilities must
conform to all of the following:
(1) Be set
forth in the water system's operation and maintenance plan and set at a level
no less stringent than the level needed for the facility to continuously
maintain compliance with applicable MCLs, MRDLs and treatment technique
requirements.
(2) Be established
for the following parameters, at a minimum:
(i) Individual filter effluent turbidity and
combined filter effluent turbidity for filter plants treating surface water or
GUDI sources.
(ii) Entry point
disinfectant residual.
(iii) Water
levels to maintain adequate CT for Giardia inactivation.
(3) Be capable of notifying the available
operator on duty of events triggering an alarm or plant shutdown.
(j)
PFAS.
(1) The Department identifies the following
treatment technologies as acceptable for achieving compliance with the MCLs for
PFAS, established under §
109.202(a)
(relating to State MCLs, MRDLs and treatment technique requirements):
(i) GAC.
(ii) Ion exchange.
(iii) Reverse Osmosis.
(2) Other treatment technologies may be
approved by the Department if the applicant demonstrates the alternate
technology is capable of providing an adequate and reliable quantity and
quality of water to the public.
Notes
The provisions of this § 109.302 amended under section 4(a) of the Pennsylvania Safe Drinking Water Act (35 P.S. § 721.4(a)); and section 1920-A(b) of The Administrative Code of 1929 (71 P.S. § 510-20(b)).
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