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STATE OF COLORADO <br /> DIVISION OF MINERALS AND GEOLOGY <br /> Department of Natural Resources <br /> 1313 Sherman St., Room 215 <br /> Denver,Colorado 80203 D I V I S I O N O F <br /> Phone:(303)866-3567 MINERALS <br /> FAX:(303)832-8106 & <br /> GEOLOGY <br /> RECLAMATION <br /> MININOSAFETY <br /> Bill Owens <br /> Governor <br /> Date: May 25 1999 Greg E.watcher <br /> y , Executive Director <br /> Michael B.Long <br /> To: Allen Sorenson Division Director <br /> From: Harry Posey <br /> Re: Review: Adequacy Response, Amer' an Soda L.L.P., Yankee Gulch Project. <br /> In the Division's Adequacy Review of the captioned facility the Operator was asked to furnish <br /> analyses of the process solutions. The purpose of that request was to evaluate whether <br /> environmental protection measures might need to be employed. <br /> The Operator's Adequacy Response contains a few analyses of the process solutions which, as <br /> the Operator points out, are incomplete. These analyses are inadequate for their express purpose <br /> and more complete data are expected to be forthcoming. However, a few observations can be <br /> made that may be useful. <br /> Table Al: ICP Scan Analyses of Mine Water Samples. Boron is 10 times and more in excess of <br /> agriculture use standards. Most of the other analyses on this table were analyzed at too coarse a <br /> level to be of use. <br /> Well 20-3: Production Liquor Analysis— ppm (non-diluted basis). Data in this table, though <br /> incomplete, indicate that the process solutions may exceed agriculture or drinking water <br /> standards for chromium, copper, manganese, nickel and zinc in most cases. The analyses <br /> presented apparently are whole water samples, and probably contain sediment which would <br /> contribute to the apparent high concentrations. In the future, the Operator should submit only <br /> results based on the dissolved method. Also, the data on these sheets have not been through a <br /> laboratory screening to remove uninformative information in the third and fourth decimal <br /> places. <br /> Well 20-2: BTEX Report: Benzene in the production water exceeds standards by more than 20 <br /> times and toluene exceeds standards slightly. <br /> 1 <br />