Fla. Admin. Code Ann. R. 62-565.520 - Off-spec Storage Requirements for Advanced Treatment Water Facilities
(1) For an ATWF for
which there are alternative reuse or disposal systems permitted, those
alternative reuse or disposal systems may be used for the management of
off-spec water. For an ATWF for which there are no alternative reuse or
disposal systems permitted, a separate, off-line system for storage of off-spec
water shall be provided.
(2) For an
ATWF connected to a public water system with the capability of treating to
primary and secondary drinking water standards, the storage requirements are as
follows:
(a) Off-spec storage ponds shall
have sufficient storage capacity to assure the retention of the off-spec
reclaimed water under adverse water conditions and maintenance of equipment.
Off-spec storage ponds shall meet the following requirements:
1. A minimum of 30 years of recent climatic
data determined by the National Centers for Environmental Information shall be
used in storage volume determinations.
2. Off-spec storage ponds shall be designed
in a manner which allows for the impoundment of rainfall equal to that of the
25-year, 3-day 24-hour storm event, as defined by the respective Water
Management District, in which the facility is located.
(b) Analytical means of determining off-spec
storage requirements shall be used and shall account for all water inputs into
the system, including water balance calculations or computer hydrological
programs. Analysis shall be based on site specific data.
(c) The methods and assumptions used for
determining the off-spec storage requirements shall be included described and
justified in the engineering report required in Rule 62-565.570,
F.A.C.
(d) For off-spec storage
ponds using non-synthetic liners, the permeability, durability, strength,
thickness, and integrity of the liner shall be satisfactorily demonstrated for
anticipated pressure gradient, climatic conditions, installation and daily
operation conditions. A quality assurance/quality control plan which
substantiates the adequacy of the liner, and its installation shall be
incorporated into the engineering report required in Rule 62-565.570,
F.A.C.
(e) For off-spec storage
ponds using synthetic liners, the liners shall be installed in accordance with
the manufacturer's specifications and recommendations. Documentation of quality
assurance and quality control activities on liner installation along with
permeability or seepage test results shall be submitted to the Department prior
to the ATWF being placed in operation.
(f) For unlined off-spec storage ponds, a
ground water monitoring plan prepared in accordance with Rule
62-520.600, F.A.C., shall be
incorporated into the ATWF permit.
(g) Off-spec storage ponds shall provide a
minimum freeboard of three feet.
(h) Provisions for the control of algae shall
be included in the design, operation, and maintenance and shall be described in
the engineering report. Pond design shall also address the control of mosquito
breeding habitat. Minimum pond depths (excluding freeboard but including the
design operating range) of six feet, with inside bank side slopes steeper than
3:1 (horizontal to vertical), but no steeper than 1:1, are required to
discourage growth of rooted aquatic weeds. Maintenance of a minimum pond water
depth of 18 inches is required. Routine aquatic weed control and regular
maintenance of pond embankments and access areas are required. The use of other
depth criteria for mosquito control shall be justified in the engineering
report.
(i) Off-spec storage ponds
shall be designed and maintained consistent with sound engineering practices to
prevent the deliberate introduction of stormwater.
(j) The siting of the off-spec storage ponds
shall be addressed in the engineering report in prepared under Rule 62-565.570,
F.A.C. Off-spec ponds shall be sited to avoid areas of uneven subsidence,
sinkholes, pockets of organic matter or other unstable soils. Ponds used to
impound reclaimed water above natural grade shall be designed to prevent
failure of the embankment due to hydrostatic forces, seepage or soil piping,
wind and wave action, erosion, and other anticipated conditions. Results from
field and laboratory tests from an adequate number of test borings and soil
samples shall be the basis for computations pertaining to seepage and stability
analyses.
(3) For an
ATWF that uses storage tanks for storage of off-spec water, the storage
requirements are as follows:
(a) Off-spec
storage tanks shall have sufficient storage capacity to assure the retention of
the off-spec reclaimed water with a minimum of 1.2 times the design flow
capacity of the ATWF.
(b) Off-spec
storage tanks shall be designed and installed in accordance with the applicable
American Water Works Association (AWWA) standard (adopted and incorporated by
reference in Rule 62-555.330, F.A.C., effective
May 5, 2014).
(c) Off-spec storage
tanks shall be checked at least annually to ensure that hatches are closed, and
screens are in place; shall be cleaned at least once every five years to remove
bio-growths, calcium or iron/manganese deposits, and sludge from inside the
tanks; and shall be inspected at least once every five years for structural and
coating integrity by personnel under the responsible charge of a professional
engineer licensed in Florida.
Notes
Rulemaking Authority 403.861(9), 403.064(17) FS. Law Implemented 403.852(12), 403.861(7), 403.853(6), 403.861(17), 403.064(17) FS.
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