Use chlorine, Coquitlam water, staff advises

THE GREATER Vancouver Regional
District (GVRD) should negotiate with
B.C. Hydro for rights to all water in the
Coquitlam watershed to supply drink-
ing water for the region’s growing pop-
wlation, and use chlorine rather than
chloramine to disinfect the water,
according to a Greater Vancouver
Water District (GVWD) staff report.

By Kevin Gillies
Contributing Writer

The report from the GVWD manager of
water and construction, which will be considered
by the GVRD water committee on Friday, ree-
ommends negotiating for the Coquitlam: Water

OF A

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OR

lait monenerniaty soe

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rights instead of building a new Seymour Dam to
meet seismic standards.

The report also notes that chlorine as a sec-
ondary disinfectant for drinking water, whife
coming with a higher cost and aftertaste, has a
potentially lower negative environmental impact
than chforamine.

B.C. Hydro owns hydroelectric
of the water in Coquitlam Lake.

Alternatives to using chlorine as primary and
secondary disinfeetints (cost between now and
2005, $375 million) include:

BM ozone as primary with chlorine as secondary
(cost between now and 2005, $940 million):

Ri chlorine as primary with chloramine as sec-
ondary (cost benween now and 2005, $190 mil-
lion).

secondary disinfection is om because of

rights to most

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GVRD

water contamination in the distribution system.

While both chlorine and chloramine have the
potential to kill marine life, chlorine dissipates
faster than chloramine (a chemical combination
of chlorine and ammonia). Using ozone as a pri-
mary and chlorine as a secondary disinfectant
would have the least impact on the environment,
but it would be costly — approximately $400
per household. Ozone dissipates very quickly.

The GVWOD repart said that while the casts of
the two water supply options are almost equal, a
new dam on Seymour Lake would raise the
water level, causing increased water turbidity for
five to 10 years.

The Coquitlam Lake option could supply
drinking water beyond the year 2043. The new
dam on Seymour Lake would meet projected

demand to 2035,

REACHING EVERY DOOR ON THE NORTH SHORI

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NEWS photo Mike Wakefield

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