Current through Register Vol. 24-06, March 15, 2024
(1) Operational reliability requirements.
(a) Entities must design and construct all
reclaimed water facilities to assure operational reliability at all times,
consistent with the approved engineering report, per WAC 173-219-210, operate
it as directed in approved operations and maintenance manual, per WAC
173-219-240 to meet the reliability requirements in this section.
(b) The generator must demonstrate adequate
capacity for failure of one or more treatment trains or standby replacement
equipment acceptable to the lead agency such that treatment is maintained at
all times with one or more treatment trains not in operation.
(2) Bypassing prohibited. The
generator must not bypass inadequately treated wastewater from the approved and
permitted reclaimed water facility to the distribution system or to the point
of use. Reclaimed water facilities must either store inadequately treated water
for additional treatment or have authorization to discharge the wastewater to
an NPDES outfall, or another permitted disposal location in accordance with a
wastewater discharge permit issued under chapter 90.48, 70.118, or 70.118B RCW.
The lead agency may:
(a) Require a reclaimed
water generator to maintain either storage or disposal options for inadequately
treated water sized to accommodate the full design flow.
(b) Specify when and how the reclaimed water
treatment facility must cease or otherwise control the generation,
distribution, and use of reclaimed water including, but not limited to, the
reduction, loss, failure, or bypass of any unit processes of the reclaimed
water facility.
(c) Specify
procedures to establish when the treatment processes are sufficiently restored
to allow the generation, distribution, or use of the reclaimed water.
(d) Prohibit bypassing of inadequately
treated water from the approved reclaimed water facility to the distribution
system or to the point of use.
(3) Removed substances. The generator must
not resuspend or reintroduce collected screenings, grit, solids, sludge, filter
backwash, or other pollutants removed during treatment to the reclaimed water
process or to the finished reclaimed water.
(4) Diversion requirements for inadequately
treated water. Design requirements for diversions of reclaimed water when
performance standards are not met must:
(a)
Include all the necessary diversion works, conduits, and pumping and pump back
equipment.
(b) Provide a power
supply independent of the primary power supply or a standby source for all
diversion equipment. An uninterruptible power supply backup is
acceptable.
(c) Automated
diversions must be capable of autonomously diverting all flow to the approved
storage or disposal location based on input from appropriate process sensors
and alarms. The reset of the process must be manually monitored to confirm
performance standards are being met.
(5) Alarms required. All reclaimed water
systems must have and use alarm systems to assure reliability. Alarm systems
must:
(a) Provide alarm warning of all of the
following:
(i) Loss of power from the primary
power supply.
(ii) Failure of
required treatment units.
(iii)
Interruption of required chemical feeds. (iv) Other events as required by the
lead agency.
(b) Be
capable of continuous operations when there is a loss of primary power supply
to the facility.
(c) Sound at an
attended location or through an automated notification system that will alert
the responsible operator in charge or designee available to take immediate
corrective action.