Laserfiche WebLink
• <br />.._..,.~ <br />TR9PPER MINING INC. <br />• ~~~iiiiiii~nii~iii <br />June 21, 1989 <br />CERTIFIED ;#P175046603 <br />Ms. Sandi Marek <br />Water Quality Control Division <br />Colorado Dept. of Health <br />4210 East 11th Ave. <br />Denver, CO 80220 <br />Dear Sandi: <br />Subject: Colorado Wastewater Discharge Permit CO-0032115 <br />~~~~~~~' <br />JUtJ 7 G 1989 <br />MINrD LAND <br />RECLAMATION DIVISIC)N <br />As reported to you by phone on June 21, 1989, Trapper Mine measured pH values <br />which exceeded our permitted discharge value. The elevated pH readings were <br />taken on 6/20/89 at Johnson Gulch discharge point 001 (pH 9.4) and No Name <br />discharge point 002 (pH 9.1). The source of the discharge at both ponds is <br />from groundwater and is not related to any ground or surface water runoff <br />passing through backfilled mining areas. Trapper is experiencing extremely <br />dry weather conditions. Natural groundwater flows in co our lower sediment <br />control ponds is very low. As a result of the low flows and high summertime <br />temperatures, significant algae growth has developed in sediment ponds. It is <br />not possible to prevent discharge from No Name pond since the present dis- <br />charge is from groundwater and the pond has a surface designed principle <br />spillway. We have installed a carbon dioxide bubbler to lower the pH of this <br />pond (002). However, due to the very low groundwater flow and the current <br />principle spillway pipe construction of the Johnson Gulch pond, it is possible <br />to temporarily block the flow (cover the discharge siphon) of water from this <br />discharge point. By blocking the siphon in the spillway (temporarily) it <br />would allow greater pond capacity before water flowed from the principle <br />spillway pipe. Additionally, this would allow Trapper an opportunity to pur- <br />chase a second regulator for carbon dioxide bubbler installation. <br />Sandi, we will continue with our present course of treatment unless instructed <br />by the Division to use some other approved or agreed-to technique. <br />P.s briefly discussed on the phone (5/21/89), this continues to be a yearly <br />(seasonal) problem. If some resolution were incorporated into our permit <br />allowing >9 pH values or the use of an acceptable algaecide during critical <br />summer periods, the issue would be resolved. <br />P.O. Box 187 Craig. Colorado 81626 r~rz~ c~ ~. ~ ~~+ <br />