WAC 246-290-652
Filtration technology and design
criteria for existing filtered systems. (1) The purveyor
shall treat all surface and GWI sources using one of the
following filtration technologies unless another technology is
acceptable to the department:
(a) Conventional;
(b) Direct;
(c) Diatomaceous earth; or
(d) Slow sand.
(2) Purveyors not using one of the filtration
technologies in subsection (1) of this section or not
complying with the design criteria specified in WAC 246-290-676 shall submit a project report to the department
that demonstrates to the department's satisfaction that the
existing water treatment facility can be operated to reliably
produce, by June 29, 1993, water meeting the operating and
performance requirements of WAC 246-290-654 and 246-290-660,
respectively. The project report shall comply with the
requirements of WAC 246-290-110.
(3) The purveyor shall make the demonstration required
under subsection (2) of this section using the latest twelve
months of operating data, results of special studies conducted
to test the performance of the water treatment facility under
adverse water quality conditions or other means acceptable to
the department.
(4) For water treatment facilities currently unable to
meet the performance and operation requirements, the project
report shall specify the modifications needed to upgrade the
facility. Purveyors upgrading existing water treatment
facilities shall comply with the design and reliability
requirements under WAC 246-290-676 and 246-290-678,
respectively.
(5) The purveyor of a new system using a surface or GWI
source shall be subject to the:
(a) Design and reliability requirements under WAC 246-290-676 and 246-290-678, respectively; and
(b) Operating criteria for new water treatment facilities
under WAC 246-290-654.
[Statutory Authority: RCW 43.02.050 [43.20.050]. 99-07-021,
§ 246-290-652, filed 3/9/99, effective 4/9/99. Statutory
Authority: RCW 43.20.050. 93-08-011 (Order 352B), §
246-290-652, filed 3/25/93, effective 4/25/93.]