Current through Register Vol. 24-18, September 15, 2024
(1)
The purveyor shall ensure that only qualified persons conduct measurements for
pH, temperature, turbidity, and residual disinfectant concentrations. In this
section, qualified means:
(a) A person
certified under chapter 246-292 WAC;
(b) An analyst, with experience conducting
these measurements, from the state public health laboratory or another
laboratory certified by the department;
(c) A state or local health jurisdiction
professional experienced in conducting these measurements; or
(d) For the purpose of monitoring
distribution system residual disinfectant concentration only, a person
designated by and under the direct supervision of a waterworks operator
certified under chapter 246-292 WAC.
(2) The purveyor shall ensure that
measurements for temperature, turbidity, pH, and residual disinfectant
concentration are made in accordance with "standard methods," or other EPA
approved methods.
(3) The purveyor
shall ensure that samples for coliform and HPC analysis are:
(a) Collected and transported in accordance
with department-approved methods; and
(b) Submitted to the state public health
laboratory or another laboratory certified by the department to conduct the
analyses.
(4) Turbidity
monitoring.
(a) The purveyor shall equip the
system's water treatment facility laboratory with a:
(i) Bench model turbidimeter; and
(ii) Continuous turbidimeter and recorder if
required under WAC 246-290-664 or
246-290-694.
(b) The purveyor shall ensure that bench
model and continuous turbidimeters are:
(i)
Designed to meet the criteria in "standard methods," approved methods under
40 C.F.R.
141.74(a)(1), or alternative
testing methods under Appendix A to Subpart C of 40 C.F.R. Part 141;
and
(ii) Properly operated,
calibrated, and maintained at all times in accordance with the manufacturer's
recommendations.
(c) The
purveyor shall validate continuous turbidity measurements for accuracy as
follows:
(i) Calibrate turbidity equipment
using a primary standard on at least a quarterly basis for instruments using an
incandescent light source and on at least an annual basis for instruments using
an LED or laser light source; and
(ii) Verify continuous turbidimeter
performance on a weekly basis, not on consecutive days, with grab sample
measurements made using either a properly calibrated bench model turbidimeter
or a secondary standard as specified by the manufacturer.
(d) When continuous turbidity monitoring
equipment fails, the purveyor shall measure turbidity on grab samples collected
at least every four hours from the combined filter effluent and individual
filters while the system serves water to the public and the equipment is being
repaired or replaced. The purveyor shall have continuous monitoring equipment
online within five working days of failure.
(5) Purveyors shall verify instruments used
for continuous monitoring of free and total chlorine residual with a grab
sample measurement at least every five days, or with a protocol approved by the
department as required under
40 C.F.R.
141.74(a)(2).
(6) Purveyors monitoring for
Cryptosporidium or E. coli as required under
40 C.F.R.
141.701 shall collect samples and have them
analyzed under
40 C.F.R.
141.704 and
141.705.
Statutory Authority:
RCW
70.119A.180 and
43.20.050. 08-03-061, §
246-290-638, filed 1/14/08, effective 2/14/08. Statutory Authority:
RCW
43.20.050(2) and (3) and
70.119A.080. 03-08-037, §
246-290-638, filed 3/27/03, effective 4/27/03. Statutory Authority: RCW
43.02.050 [43.20.050]. 99-07-021, § 246-290-638, filed 3/9/99, effective
4/9/99. Statutory Authority:
RCW
43.20.050. 93-08-011 (Order 352B), §
246-290-638, filed 3/25/93, effective
4/25/93.
