|(a) A wastewater treatment facility must be designed
to prevent the discharge of untreated or partially treated wastewater
during electrical power outages.
(b) A wastewater treatment facility must include an
audiovisual alarm system. The alarm system must transmit all alarm
conditions through the use of an auto-dialer system, a Supervisory
Control and Data Acquisition (SCADA) system, or a telemetering system
connected to a continuously monitored location. Audiovisual alarms
are not required if the SCADA system notifies the operator about communication
loss, in addition to all other alarm conditions.
(c) An alarm system must self-activate if:
(1) the power supply is interrupted;
(2) a pump fails; or
(3) a high water level alarm is triggered.
(d) An alarm system must include self-testing capability
at the control panel.
(e) An owner shall determine the reliability of the
existing commercial power service for a wastewater treatment facility
using records from the past 60 consecutive months from the electric
utility that serves the wastewater treatment facility. The entire
record must be used if 60 months of records are not available. The
owner must provide the power outage records and the reliability determination
in the engineering report. The records must:
(1) be in writing;
(2) be on the electric utility's letterhead and bear
a signature of an electric utility employee who has knowledge of data
about power outages;
(3) identify the location of the wastewater treatment
(4) list the total number of power outages that have
occurred during the past 60 consecutive months; and
(5) indicate the date and duration of each recorded
(f) The executive director may consider documentation
of commercial power system upgrades and their effects on the reliability
of commercial power. Documentation of upgrades and their effects on
power reliability must be submitted to the executive director in writing
on the electric utility's letterhead and must bear the signature of
an electric utility employee.
(g) Systems for preventing discharge of untreated or
partially treated wastewater must operate for a duration at least
equal to the longest power outage on record for the past 60 consecutive
months, or at least 20 minutes, whichever is longer. The design must
consider the effects of peak flow, inflow, and infiltration. If the
longest power outage on record for the past 60 consecutive months
is greater than 48 hours and generators will be used to provide backup
power, then the owner must have a contract in place that guarantees
fuel supply during an emergency. The owner must also have sufficient
storage capacity at the wastewater treatment facility for the fuel
for the duration of the emergency.
(h) Systems for preventing discharge of untreated or
partially treated wastewater at a wastewater treatment facility must
either be permanent features of the wastewater treatment facility,
or be temporary power systems that are capable of being made operational
before an unauthorized discharge occurs during any electrical power
outage. The engineer must describe how a temporary power system will
be deployed and operated in the engineering report, and must address
deployment during all types of weather events that might reasonably
cause a power outage at the wastewater treatment facility.
(i) Systems for preventing discharge of untreated or
partially treated wastewater may include any combination of alternate
power sources, on-site generators, interceptor systems, on-site retention,
collection system storage, portable generators, mechanical backup
systems, or other similar systems.
(1) Collection system storage may not be used as a
sole means of preventing the discharge of untreated or partially treated
wastewater during a power outage.
(2) The main power source and an alternate power source
may not be provided by the same power plant.
(3) Portable generators and pumps may only be used
to guarantee service if:
(A) a tested quick-connect mechanism and a properly
sized automatic transfer switch is provided where the generator will
be used; and
(B) a licensed operator that is knowledgeable in operation
of the portable generators and pumps will be on call 24 hours per
day every day.
(j) The engineering report must include a description
of emergency operation of the wastewater treatment facility. Treatment
units that require continuous operation during a power outage must
be identified in the engineering report. The minimum requirements
for the systems that must be operational and additional engineering
report requirements are listed in paragraphs (1) - (4) of this subsection.
(1) A wastewater treatment facility must be designed
to achieve primary treatment and to disinfect the wastewater to ensure
compliance with the bacteria limits established in the wastewater
treatment facility's wastewater permit during all power outages, including
outages that are longer than outage predicted based on the power reliability
determination required in subsection (e) of this section.
(2) All components of the disinfection system, including
any reclaimed water used to make a chemical solution, must operate
at full capacity during all power outages according to the requirements
of §217.37 of the title (relating to Disinfection System Power
Reliability), including outages that are longer than outage predicted
based on the power reliability determination required in subsection
(e) of this section.
(3) Return activated sludge pumps must be operational
during any power outage.
(4) If portable generators or pumps are used to guarantee
service, the engineering report must include:
(A) the storage location of each generator and pump;
(B) the amount of time that will be needed to transport
each generator or pump to where it will be used;
(C) the treatment units to which each generator or
pump is designated as a backup; and
(D) the routine maintenance and upkeep that will be
done for each portable generator and pump to ensure that they will
be operational when needed.