Disinfection of Storage Facilities - Disinfection of Pipelines and Storage Facilities Field Guide - page 66

applicable regulations and requirements. The applicable waste-
water treatment facility should be notified when discharging to a
sanitary sewer.
Bacteriological Testing
Water from the storage facility must be sampled following
completion of the chlorination method and should be tested for
total coliform bacteria according to the latest edition of Standard
Methods for the Examination of Water and Wastewater (chlorine
residual, free and combined, is tested to verify conformance with
the chlorination requirements and to restore the water to potable
quality). If the test is negative for total coliform, the facility can
be released and placed into service. If the test is positive for total
coliform, repeated samples should be taken until two consecutive
samples (taken 24 hr apart) are negative. The facility may be
rechlorinated according to the previously stated procedures and
then tested again for total coliform as previously described.
Samples should be taken from a sample tap on the outlet
piping or from a sample tap that is directly connected to the
facility. The water drawn from the tap must represent the water
within the facility. Additional samples may be advisable to ensure
uniform disinfection results. Storage facility hatches are suitable
for this purpose. It is recommended to sample the facility fill-
water to make sure it does not contain total coliform bacteria.
Additional Test for Odor
The water in the facility should be tested for odor. Offensive
odors may indicate the presence of trace substances that may
cause customer complaints. If an offensive odor is detected, steps
should be taken to eliminate it before the facility is placed in ser-
vice. This may include further cleaning or allowing additional
time for odors to dissipate before returning the tank to service.
Release to Potable Service
The disinfection procedure should be documented and required
records submitted to applicable regulatory agencies. The facility
should be connected to the distribution system and the system
operators notified that the facility if now active. If disinfection is