Laserfiche WebLink
III IIIIIIIIIIIII III <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Getches, Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTO N, Director <br />Richartl D. Lamm <br />Governor <br />DATE: May 2, 1985 <br />T0: Susan Mowry <br />FROM: Randall Price <br />RE: ARCO 1600 Permit Revision and Annual Hydrologic Report <br />I have reviewed the ARCO permit revision and annual hydrologic report for <br />1984. ARCO proposes to extend its present mining boundary to the Minnesota <br />Creek divide to the south. My review was limited to ground water issues. The <br />following are my comments and concerns. <br />1. Based on current water level s, permeability data from monitoring wells, <br />and known mine inflows a calculation should be made to determine the extent of <br />dewatering of overburden in the proposed permit area. <br />2. Calculations should be submitted to show the extent of surface <br />subsidence in the proposed permit area. <br />3. Table 2.8.1X of the permit application is measured spring yields. Some <br />springs show intermittant flow of extreme volume fluctuation. Spring G-22 <br />has flows that range from 0 to 208 gallons per minute. Other springs have <br />similar fluctuations, J-7, G-14, G-6, G-24, and G-28. One spring that is <br />noticeably different is WCC-24 which has a regular flow of between 48 and 60 <br />gallons per minute. What geologic/hydraulic mechanism would explain this <br />constant flow. <br />/ph <br />cc: Bob Liddle <br />Doc. No. 045 <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />