California Code of Regulations › Title 22 - Social Security › Division 4 - Environmental Health › Chapter 17 - Surface Water Treatment › Article 5 - Operation › Section 64660 - Operating Criteria

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a) All
				  treatment plants utilizing an approved surface water shall be operated by
				  operators certified by the State Board in accordance with Health and Safety
				  Code section
				  106885.
(b) Filtration facilities shall be operated
				  in accordance with the following requirements:
(1) Conventional and direct filtration
				  treatment plants shall be operated at filtration rates not to exceed 3.0
				  gallons per minute per square foot (gpm/sq. ft.) for single media filters and
				  6.0 gpm/sq. ft. for deep bed, dual or mixed media filters under gravity flow
				  conditions. For pressure filters, filtration rates shall not exceed 2.0 gpm/sq.
				  ft. for single media filters and 3.0 gpm/sq. ft. for dual, mixed media, or deep
				  bed filters;
(2) Slow sand filters
				  shall be operated at filtration rates not to exceed 0.10 gallon per minute per
				  square foot. The filter bed shall not be dewatered except for cleaning and
				  maintenance purposes;
(3)
				  Diatomaceous earth filters shall be operated at filtration rates not to exceed
				  1.0 gallon per minute per square foot;
(4) To obtain approval for filtration rates
				  higher than, but not more than twice, those specified in paragraphs (1), (2),
				  and (3), a water supplier shall demonstrate to the State Board that the filters
				  can comply with the performance requirements of section
				  64653;
(5) To obtain approval for filtration rates
				  greater than twice those specified in paragraphs (1), (2), and (3), a water
				  supplier shall demonstrate to the State Board that the filters do the
				  following:
(A) Provide a minimum of 99
				  percent
Giardia lamblia
cyst removal, 90 percent virus
				  removal, and 99 percent
Cryptosporidium
removal; and
(B) Meet the turbidity performance standards
				  established in section
				  64653(c);
(6) Filtration rates shall be increased
				  gradually when placing filters back into service following backwashing or any
				  other interruption in the operation of the filter;
(7) When any individual filter in a
				  conventional or direct filtration treatment plant is placed back into service
				  following backwashing or other interruption event, the filtered water turbidity
				  of the effluent from that filter shall not exceed any of the individual filter
				  turbidity performance triggers in table 64660, subparagraphs (A) through (D).
				  The filtered water turbidity of the effluent from any individual filter in a
				  conventional or direct filtration treatment plant shall not exceed any of the
				  individual filter turbidity performance triggers in table 64660, subparagraphs
				  (E) through (G). If an exceedance occurs, a supplier shall comply with the
				  required follow-up action in table 64660:
Table 64660
Individual Filter Turbidity Performance
					 Triggers and Required Follow-Up Actions for a Trigger
					 Exceedance(a)
Performance Trigger at Any Time During
							 the First Four Hours of
							 Operation
Required Follow-Up
							 Actions
(A) 2.0 NTU
1. The supplier shall take the
							 filter unit out of service and inspect it to determine the cause of its
							 inadequate performance; and
(B) 1.0 NTU following at least 90 percent of the
							 interruption events during any period of 12 consecutive months
2. The
							 supplier shall not return the filter unit to service until deficiencies have
							 been corrected and operations tests demonstrate that the filter unit is meeting
							 the performance triggers of subparagraphs (A), (B), and (C). The supplier shall
							 comply with the required follow-up actions of subparagraphs (A)1. and
							 (A)2.
Performance Trigger at the Time that
							 the Filter has been in Operation for Four
							 Hours
Required Follow-Up
							 Action
(C) 0.5 NTU
The supplier shall comply with
							 the required follow-up actions of subparagraphs (A)1. and (A)2.
Performance Trigger in Two Consecutive
							 Measurements Taken No More than 15 Minutes
							 Apart
Required Follow-Up
							 Action
(D) For a supplier serving 10,000 or more persons,
							 0.3 NTU after the filter has been in continuous operation for 60 minutes or
							 more
Within seven days of the exceedance, the supplier shall produce a
							 filter profile if the supplier is unable to identify and report a reason for
							 the abnormal filter performance.
(E) 1.0 NTU
A supplier serving 10,000 or more
							 persons shall comply with the required follow-up action of subparagraph
							 (D).
(F) 1.0 NTU for three consecutive months
1.
							 Within 14 days of the exceedance, the supplier shall conduct a self-assessment
							 of the filter. The self-assessment shall consist of the following components as
							 a minimum: assessment of filter performance; development of a filter profile;
							 identification and prioritization of factors limiting filter performance;
							 assessment of the applicability of corrections; and preparation of a filter
							 self-assessment report;
2. A supplier serving fewer than 10,000
							 persons shall conduct a self-assessment unless a comprehensive performance
							 evaluation (CPE) was conducted pursuant to an exceedance of subparagraph (G);
							 and
3. A supplier serving fewer than 10,000
							 persons and monitoring pursuant to footnote (c) of table 64655 shall conduct a
							 self-assessment of each individual filter.
(G) 2.0 NTU for two consecutive months
1. The
							 supplier shall arrange with the State Board for the conduct of a CPE pursuant
							 to "Optimizing Water Treatment Plant Performance Using the Composite Correction
							 Program," EPA Handbook, Chapter 4, pg. 21-65, Office of Research and
							 Development, USEPA, EPA/625/6-91/027 (revised August 1998), which is
							 incorporated by reference;
Performance Trigger at Any Time During
							 the First Four Hours of
							 Operation
Required Follow-Up
							 Actions
2. If a supplier serves 10,000 or more
							 persons, the CPE shall be conducted no later than 30 days following the
							 exceedance; and
3. If a supplier serves fewer than 10,000
							 persons, the CPE shall be conducted no later than 60 days following the
							 exceedance. If a CPE was completed within the prior 12 months or the supplier
							 and State Board are jointly participating in an ongoing comprehensive technical
							 assistance project at the water system, a new CPE is not required.
__________
(a) For a
							 supplier monitoring pursuant to footnote (c) of table 64655, the individual
							 filter turbidity performance triggers of table 64660 shall apply to the
							 combined filter effluent.
(8)
				  Pressure filters shall be physically inspected and evaluated annually for such
				  factors as media condition, mudball formation, and short circuiting. A written
				  record of the inspection shall be maintained at the treatment plant;
				  and
(9) Coagulation and
				  flocculation unit processes shall be in use at all times during which
				  conventional and direct filtration treatment plants are in operation. The
				  effectiveness of these processes shall be demonstrated by either at least an 80
				  percent reduction through the filters of the monthly average raw water
				  turbidity or jar testing, pilot testing, or other means to demonstrate that
				  optimum coagulation is being achieved.