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t- . III~iI~l~~ll~~ll~ll P STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 131 J Sherman Si., Room 215 Denver, Colorado 80?03 Phone: 13031 866-3567 FAX: 1303) 812-8106 March 29, 1996 Ms. Sally Hayes Kaiser Battle Mountain Resources, Inc. P. O. Box 310 San Luis, CO 81152-0310 RE: ANNUAL REPORT FOR 1995 -San Luis Project -Permit No. M-88-112 Dear Ms. Kaiser: I noticed a couple possible problems while reviewing the 1995 annual report. I~~~~ DEPARTMENT OF NATURAL RESOURCES Roy Romer Governor )amen 5. Lochhead E.ecmive Director Mo:hael B. Long Division Director First, pursuant to the requirements of TR-16, the main embanlmtent underdrain flow is to be measured monthly and reported to the Division in the annual report. As noted on 'Cable 2 of your report, the underdrain flow was not monitored in January,. Febntary, March, April, May or June of 1995. Second, the 10 embanlonent piezometers are to be monitored montlily and reported to the Division in the annual report (TR-16). Also, if water is detected in any of the embanlanent piezometers, BMRI will report the discovery to the Division within one week. As noted on Table 1, piezometers 11 through 15 were monitored ten times in nine months. Piezometers 6 through 10, however, were only monitored seven times during the same nine-month period. Your measurements are reported as depth to water. You note that a few of We piezometers are dry and the others, apparently, are wet. Piezometer number 10 appears to have a significant fluctuating water wlumn. On July 28, 1995 and August 30, 1995 you measured 58.9 feet to water. On July 5, September 20, October 12, November 16 and December 8, 1995 you measured 57.4, 57.8, 57.8, 57.8 and 57.7 feet, respectively, to water. It looks like the water level moves up and down as much as 1.5 feet. It seems as though there are a couple of other piezometers (numbers 12 and 13) that may have fluctuating water columns. I would like you to explain to the Division why the embankment underdrain flow was not monitored the first six (6) months of 1995.