Laserfiche WebLink
r <br />` ~ ~ .y <br /> <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Gelches, Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />Richard D. Lamm <br />Governor <br />May 8, 1985 <br />Mr. Bruce Humphries <br />Trapper Mining Inc. <br />P.O. Box 187 <br />Craig, Colorado 81626 <br />RE: Trapper 1984 Annual Ground Water Monitoring Report - Division Review <br />Dear Mr. Humphries: <br />The Division has competed an initial review of Trapper's Annual Ground Water <br />Monitoring Report for 1984. The information was generally well formatted; <br />however, this data should be reviewed by Trapper prior to submittal for <br />variances from the expected results and a narrative attached with the <br />operator's evaluation of the year's monitoring results. <br />During review of the ground water data, the Division identified the following <br />concerns. Trapper Mining Inc needs to r~Spond tD these concerns by <br />July <br />The only formatting problem noted was in Table 1. This table needs to have <br />sampling dates included for the quarterly monitoring. Also, page 2 of Table <br />should have well designations included in order to facilitate review. For <br />future reporting, the data should be cumulative through the entire period of <br />record (since monitoring began). By reporting the data in this fashion, the <br />data set can easily be scanned by both the Division and Trapper, in order to <br />identify and evaluate any long-term trends. <br />Although, total dissolved solids (TDS) and conductivity are not directly <br />correlative, a general relationship exists between the two in water. This <br />correlation ranges most often with TDS being between 0.6 and 0.8 of the <br />conductivity. Trapper's lab TDS values and field-measured conductivity values <br />often show no such correlation and in some instances, the TDS is only 20 <br />percenii of measured conductivity. An explanation should be provided for this. <br />The Division is concerned with the unusually high SAR values in wells GF-2, 3, <br />and 4, all being greater than 40. These are located down-gradient of the <br />A-Pit. Trapper Mining Inc. should comment on this with regard to source of <br />elevated SAR values and any baseline data that is not available in the <br />Division's files. <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />,; ~ _.. i i. L. IY I a~ <br />• III IIIIIIIIIIIIIIII <br />999 <br />