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999 <br />YVCC <br />Yampa Valley Coal Corporation ~ 29588 Routt County Road #27, Oak Creek, CO 80467 • (303) 879-3800 <br />July 6, 1987 <br />Ms. Cathy Begej <br />Colorado Mined Land Reclamation Division <br />1313 Sherman Street, Room 423 <br />Denver, CO 80203-2273 ~~ ~ $ 1J87 <br />Dear Ms. Begej: MINED LAND <br />RECLAMATION DIVISION <br />Re: 19 AHR - Foidel Creek Mine; File No. C-82-056 <br />A number of comments were presented in your letter of May 26, 1987 <br />about the above referenced report, and TCC would like to respond to them. <br />Before doing so, I would like you to know I've passed on the compliment you <br />gave to Jim and it was appreciated greatly. <br />In reference to the mercury standard for aquatic life, this point has <br />been a topic in prior discussions and correspondence. As has been stated <br />previously, TCC's contract laboratory is using state of the art methods in <br />analyzing for mercury. The detection limit of the procedure is the best <br />that can be obtained. I would request that if you know of another <br />laboratory procedure, currently used in commercial labs, please forward it <br />so that I can have the Bookcliffs Laboratory look into the procedure. <br />In regards to the discrepancy between the field and lab electrical <br />conductivity, I believe this problem is under control and should not be a <br />problem is the future. The contractor has purchased new equipment and <br />standardizes it prior to each sampling episode. Hopefully, these twc <br />factors will result in better field measurements. <br />The last item that requires discussion is the variability in the water <br />quality reported for Well 006-82-48A and 006-82-48. It is believed the <br />variability is the result of the sampling procedure used currently. As you <br />know a complete casing volume of water is removed prior to obtaining a water <br />quality sample. Previously, a water sample was obtained without removing a <br />casing volume of water. It is anticipated that the wells will stabilize, <br />and the variability in the reported results will decrease to an acceptable <br />range. Normal statistical procedures can be used to correlate the data from <br />any one site after the wells have stabilized. <br />If there are questions, please contact me at your convenience. <br />Sincerely, <br />~~~ ~~~ <br />Richard Mills <br />Supervisor-Environmental Affairs <br />~ycQ.~-a <br />RAM/de <br />