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THE CORPORATION OF THE
CITY OF PORT COQUITLAM

AUG 1.2 1985.

MEMORANDUM

F.E. Peters, P,Eng., August 1, 1985>
Acting City Administrator | 7

FROM: TeoM. Chong, P.Eng.,
Assistant City Engineer

SUBJECT: Resolution to U.B.C.M. = Discharge of chiorinated
- water Into watercourses. : a .

RECOMMENDATION:

le ‘That the proposed resolution attached to this memo on the subject —
— of discharging chlorinated water directly into fish rearing
watercourses be forwarded to the U.B.C.M. as a late submission.

EA SRNR ST EEA ane 2 TE NP

That the City Clerk be instructed to prepare the documentations
required by the U.B.C.M. in order to consider the proposed
resolution as a late submission. . | .

AP AS ML ie

BACKGROUND AND COMMENTS:

7 Following the most recent fish kill at the Josal Salmonid
Enhancement Program Hatchery on the Ceoquitiam River as a result of a
chiorine spliil by the G.V.W.D0., Alderman Gates expressed soma
concerns, during a recent meeting of the Environmental Protection:
Committee, regarding the current practice of disposing water. flushed
from watermains. Specifically, since the G.V.W.0. water supply is
chlorinated, he was soncerned that during the regular annual hydraulic
flushing of watermains, water with concentrations of chiorine
residuals many times that of the lethal limit for certain varieties of
fish, would be:discharged directly into a flsh rearing watercourse, —

De RD a IO re ER a

a Following Alderman Gates enquiry, data was obtained from the

recent G.V.W.D. analysis of water samples taken from several areas. of
the City. . The data revealed that the free chlorine residual in the.
City's water supply system ranged from 0.02 to 0.04 parts per million

(pepoms.). These figures are tow In comparison to the provincial:
drinking water standard of 0.2 pademe but high In comparison to the

minimum lethal limit of 0.002 p.p.m. for certain varieties of fish.

Further information from the G.V.WeO. Indicated that the water from

Coquitlam Lake is normally chlorinated to 0.3 p.p.em. which Is over a

hundred times the aforesald lethal limit of 0.002 pepems. although

admittedly, this concentration of chlorine would decrease gradually as

it travels downstream from the Coquitlam Lake Chlorination Station.

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