, THE CORPORATION OF THE CITY OF PGRY COQUITLAM

‘ 3 reves

j (i) Colbalt is a potentially hazardous element being toxic to

: stickleback fish at concentrations of 10 mg/1 (ppm) or possibly less and also to humans. Because of the proposed disposal

; methods and since the reported maximum concentration of

: cobalt in the wastewater is only 1).1 mg/l, this element

4 is not expected to be a problem.

i (5) On the basis that Tungsten, Tantalum, and Niobium will be : in the particulate carbide form and they are reportedly

' . non~toxic (according to Mr. Stockwell), these elements should present no problem and presumably will be filtered out in the proposed settling-percolation beds. "

2. It is appreciated that this application is a regularization of a treatment and disposal procedure that has been in effect for approximately three years. The applicant has indicated verbally that another lagoon twice as large as the existing lagoon is planned to te installed and that the existing : lagoon will be rejuvenated. There would appear to be a need for such action,

i because the existing lagoon is gradually plugging up and because it overflows during periods of heavy rainfall.

¢ i 1 € i

; 3. The periodic overflowing of the existing lagoon may be i partially due to roof and yard drainage entering the disposal system. Any such uncontaminated flows should be separated.

4, The City requests that properly designed and scheduled

treatment facilities as proposed verbally by the applicant be required. It is considered desirable that proper design would be based on geological, soil, and percolation tests to determine the suitability of new lagoon installations.

5. The City feels that the wastewater discharge, if not handled properly could result in nuisances and possible environmental deterioration, For this reason it is requested that you advise the City of your disposition of this application. Should problems arise in the future the City

n requests your assistance and guidance to correct the problems.

Yours truly,

R.A. Preeman

City Clerk VGB/ mw