Laserfiche WebLink
<br />TWBN9'YM16E <br />COAT. COMPANY <br />A Cyprus Ama: Company <br />June 21, 1996 <br />Mc Kenl Gorham <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street Room 21 ~ <br />Denver, Colorado 80203 <br />Re: ~iplication o(Cutrine Plus Algaecide at Pond A <br />Dear Mr. Gorham: <br />Twentymile Coal Corporation <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />970-879-3800 <br />RCt^GI\/FD <br />JUN 2 5 ~gy6 <br />Division of Minerals ~, ~;eU1Ugy <br />As per our conversation this rooming. "fwentymile Coal is planning to treat Pond A with Cutrine Plus to <br />control algae. Filamentatious algae is causing problems with [he filter system for mine water collection <br />from Pond A. <br />In order for this chemical to be effective in controlling the algal growth, the concentration of copper must <br />be maintained at 0? ppm for a minimum of 3 hours. This concentration is above our daily maximum <br />effluent limitation of 0.13 ppm. We plan m temporarily plug [he riser orifices [o allow for dilution of [he <br />copper to within our effluent standards. The water surface elevation is currently at approximately 6935.5 <br />and the top of the riser is a[ an elevation of 6938. Based on the latest stage-storage survey, approxinm[ely <br />49:d acre-feet of additional water can be held between the current water surface elevation and the top of the <br />riser. Assuming that inflow equals outflow, it will take approximately 108 hours to raise [he water level in <br />the pond to the top of the riser. The plan for application of Cutrine Plus at Pond A is as follows: <br />• Plug the orifices on Friday, June 21, 1996 at I :00 p.m. <br />• Apply 70 gallons of Cutrine Plus on Saturday, June 22, 1996 a[ 5:00 am using aerial spraying. <br />• Monitor the water level in Pond A on a daily basis. Based on estimated inflow, assuming no <br />si;niticant rainfall the water level should overtop the riser around I:00 am nn Wednesday. June <br />26.1996. <br />• Remove the riser plugs on 'iuesday, June 25, 1996, unless the water overtops the riser earlier <br />due to rainfall contribution. <br />• Collect sample for potentially dissolved copper immediately after flow resumes. <br />I hove includzd a copy of the manufacturer's product usage inforntation, MSDS, and calculations for your <br />review. Please contact me if you have amp questions or require any further infomta[ion concerning this <br />matter. <br />l-W'ENTYMILE COAL COMPANY, <br />~D. Rogers <br />Environmenml Specialist <br />/tdr <br />enclosures <br />Jii. i.IdununrrnlA. nlnnr duc <br />