ST9801-CS000620P.O. Box 478
255ParkwayBird
Coppell, TX 75019
Phone: (972}304-3679
Fax: (972)304-3570
ENGINEERING DEPARTMENT
FAX CO VER SHEET
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"City of Coppell Engineering-Excellence By Design"
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NA CE CON ERV^TION COMMXSStON(
(2) Each surface water treatment
plant must have at least a Grade "C" surface water
operator on duty when the plant is in operation or be
provided with continuous turbidity and disinfectant
residual monitors with automatic plant shutdown and
alarms to summon operators so as to ensure that the
water produced continues to meet the Commission's
drinking water standards during periods in which the
plant is unattended.
(3) Systems which have sources
which are classified as Foundwater under the influ-
ence of surface water must be under the supervision
of either an operator who has at least a Grade C
groundwater certificate and has completed additional
training or an operator who has at least a Grade C
surface water certificate.
(A) Those systems which
utilize cartridge filters must be under the supervi-
sion of at least a Grade C groundwater operator who
has completed a commission recognized 8-hour train-
ing course on monitoring and reporting require-
ments.
(B) Those systems which
utilize coagulant addition and direct filtration must be
under the supervision of at least a Grade C ground-
water operator who has completed a commission rec-
ognized 20-hour surface water production course and
a commission recognized 8-hour training course on
monitoring and reporting requirements.
(C) Those systems which
utilize complete surface water treatment must comply
with the requirements of 30 TAC §290.46 (e)(2).
(4) Certified operators must pro-
vide the commission with written, dated and signed
notice of the public water systems which they operate
or are employed by when applying for, renewing, or
upgrading their certification. This notice must be
amended in writing within ten days of any change in
responsibility.
(f) Disinfectant residual and monitor-
ing. Facilities shall be provided to maintain an ade-
quate disinfectant residual throughout the distribution
system and equipment shall be available for monitor-
ing the concentration of the disinfectant.
( 1 ) Mechanical disinfection fa-
cilities capable of maintaining an acceptable disin-
fectant residual shall be provided for all public water
supplies. At all times. the disinfection equipment
shall be operated to maintain the following minimum
disinfectant residuals in the far reaches of the distri-
bution system:
(A) A free chlorine r~-,,
sidual of 0.2 mg/l; or
(B) A chloramine re-
sidual of 0.5 mg/l (measured as total chlorine) for
those systems that feed ammonia. ' '
(2) The disinfectant residual in
the distribution system must be tested periodically
using a test kit which employs a diethyl-p-phenyl-
enediamine (DPD) indicator. The record of these test
results shall be maintained for at least three years.
(A) Public water systems
must conduct daily disinfectant residual tests at rep-
resentative locations in the distribution system unless
they utilize ground water or purchased water sources
only and serve fewer than 250 connections or 750
persons daily.
(B) Systems which util-
ize ground water or purchased water sources only and
serve fewer than 250 connections or 750 persons daily
must test the disinfectant residual at representative lo-
cations in the distribution system at least once every
seven days.
(C) Systems which util-
ize surface water or ground water under the influence
of surface water must monitor the disinfectant resid-
ual of the water entering the distribution system in
accordance with the requirements of the drinking wa-
ter standards.
(D) Representative disira
fectant residual monitoring locations shall include,
but are not limited to, those identified in the bacterio-
logical sample siting plan and those in the far reaches
of the distribution system. Only residual tests taken at
bacteriological sampling sites can be used for com-
pliance monitoring.
ter system personnel must be performed when repairs
are made to existing facilities and before new facili-
ties are placed into service. Disinfection must be per-
formed in accordance with AWWA requirements and
water samples must be submitted to a laboratory ap=
proved by the Texas Department of Health. The
sample results must indicate that the facility is fr~ of
microbiological contamination before it is placed into
service. When it is necessary, to return repaired mains
to service as rapidly as possible, doses may be in-
creased to S00 mg/l and the contact time reduced to
one-half hour.
(h) Calcium hypochlorite, A supply of
calcium hypochlorite disinfectant shall be kept on
~) RPC, Inc. 1999