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<br />III IIIIIIIIIIIIIIII <br />899 <br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />1313 Sherman St.. Room 2t6 <br />Denver, CO 80203 <br />303 866-3567 <br />FAx~303 632-8106 <br />~.OF CD~DH <br />ti >Q <br />~n!" ~•QJ > O <br />~~~ vJ <br />e <br />Roy Rome,. <br />Governor <br />Fred R. Banta. <br />Division D~rcctor <br />February 4, 1992 <br />Steamboat Springs, Colorado 80477 <br />RE: Grassy Gap - C-81-039 Annual Hydrology Report <br />Mr. Robert Peterson <br />ACZ, Inc. <br />1475 Pine Grove Road, Suite 109 <br />P.0. Box 774018 <br />Dear Mr. Peterson: <br />The Division has completed its review of the 1991 Annual Hydrology Report, <br />Pond Inspections, and Spring and Seep Survey for the Grassy Gap Mine. Given <br />the fact monitoring will continue until final bond release/forfeiture and that <br />date is yet unknown, my comments and recommendations are based on this report <br />and any submitted in the future. <br />Most reports are submitted to the Division for a water year, October to <br />September. Given the limited amount of water monitoring, the Division is <br />not opposed to using a calendar year if you so desire. <br />2. Please submit a map showing all NPDES monitoring points as well as <br />surface and ground water monitoring locations. Many times a staff <br />hydrologist who is unfamiliar with the site is assigned the task of <br />reviewing the annual hydrology reports. Having a map included in the <br />report allows the specialist to quickly orient themselves and eliminates <br />confusion due to monitoring changes and outdated or incorrect maps. <br />3. Along the same lines, baseline or historical quantity and quality data <br />are normally submitted and we also ask that the permittee make some <br />general conclusions on impacts (if any>. It is understood that ACZ may <br />not have significant baseline data, but future years AHRs should include <br />these items. Historical data is many times submitted using averages, <br />tables, graphs, etc. <br />4. It appears that the September sample was submitted for full suite quality <br />testing in October. Please explain this discrepancy. <br />STATE OF COLORADO <br />