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. THE CORPORATION OF THE CITY GF PORT COQUITLAM

*

(c)

(d)

(e)
(f£}

(g)

¢h)

The total suspended solids concentration is listed as
0.045 grams/liter. Since, according to Mr. Stockwell,
Tungsten, Tantalum, and Niobium are in the form of
suspended particulate carbides (i.e., the metal plus

carbon), and alone these metals total more than 0.045 grams/liter,

there may be a discrepancy in the listed suspended solids
concentration unless, in fact, the metals are dissolved

in part. Mr. Stockwell was going to check into this matter
further.

The concentration of Biochemical Oxygen Demand (BOD) is
listed as N.A. According to Mr. Stockwell this designation
means Not Applicable and is so stated because the BOD is
zero. This indicates that the waste is unlikely to have
any organic matter content.

The range in the pH is 2 to 7, or from acid up to neutral.

In the absence of organic matter, it is expected that the
sulfates (SO,) will not result in any odor nuisance due to
H,S production or to soil plugging by ferrous sulfide

(FS = pyrrhotite) which materials can be produced in the
presence of decaying organic matter,

Because of the potential effects on the health of individuals
consuming Nitrates and Fluorides, the controlled release

of these constituents to the environment is necessary.
Provided that the release of these materials to the existing
and proposed settling-percolation system does not contaminate
any dyinking water supply (such as well supply), the con-
templated method of wastewater handling should be satisfactory,
Also, nitrates could stimulate biological micro-organism
growth in the presence of other required nutrients, but
problems resulting from this cause might result only if the
wastewater were delivered to a ditch or natural watercourse
or if the nitrogen (as nitrates) could enter such a water-
course via the groundwater,

The iron content is very high and could result in the
characteristic reddish-brown discoloration of anything
(ditches or streambeds) coming in contact with the products

of iron oxidation. ‘The proposed disposal methods will
probably prevent this problem unless the groundwater receiving
the percolated wastewater flow emerges in a nearby watercourse
before the wastewater has been adequately diluted.