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..~ ;.: STATE OF COLORADO P,~ Roy Romer, Gove DEPARTMENT OF NATURAL RESOURCES MINED LAND RECLAMATION DIVISION FRED R. BANTA, Dlraotor February 6, 1989 Mr. Bob Sherman Rockcastle Coal Company C/0 Mr. Mark Korb Korb and Carroll 106 Oak Street Fort Collins, Colorado 80524 RE: 1988 Annual Hydrology Report, Grassy Gap Mine, C-81-039 Dear Mr. Korb: I have reviewed the 1988 Annual H-ydrology Report submitted by Mr. Allen Miller on October 26, 1988. Monitoring appears to comply, in principle, with the monitoring plan approved in Technical Revision 02. In addition, laboratory quality assurance practices look acceptable. I do have a few questions about the data on which I would appreciate clarification before March 15, 1989. h1r. Miller's report states that "no new springs or seeps were detected." Does he or Rockcastle have a map identifying the location of existing springs or seeps? Please forward a copy to this office, as this would provide verification that the survey was done. Should Grassy Gap have more than three (3) springs and/or flows greater than 40 gpm in June, a modification of the spring and seep survey is recommended. Most spring and seep surveys involve the measurement of field parameters (fl ow, pH, EC, temperature and dissolved oxygen) at all springs as well as a full suite analysis of the spring with the largest flow. 2. Flows at surface water sites are typically reported in a flow per unit time measurement. Please convert the flow for SW-4 to a meaningful unit. (I would accept a reference to a stage discharge curve for the site, if it is present in the permit application.) 3. There is no record of NPDES reports in this office. Rule 4.05.13(2)(iii) requires the quarterly submittal of NPDES reports. Please submit copies of the 1988 reports, and submit future reports on a quarterly basis. \ 215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567