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• TAB 13 <br />HYDROLOGIC MONITORING PROGRAM <br />Introduction <br />A ground and surface water monitoring program has been developed to evaluate sad <br />assess the existing ground and surface water systems at the Hayden Gulch Terminal, <br />Inc.'s (HGTI) Hayden Gulch Loadout facility. Monitoring at the Hayden Gulch <br />Loadout facility will provide sufficient hydrologic data to assess potential <br />adverse impacts to the system during and after facility operation. Monitoring data <br />collected as part of the program is used: 1) to evaluate the accuracy of adverse <br />impacts, if any, predicted in Tab 15, Probable Hydrologic Consequences; 2) to <br />determine when monitors may be discontinued or added where they are needed; and, 3) <br />to determine when the frequency, number, and type of parameters monitored in the <br />program may be changed. Monitoring data are collected and analyzed following <br />standard procedures described in published literature produced by Federal agencies <br />• such as the U.S. Geological Survey and the U.S. Environmental Protection Agency, <br />and as required by Rule 2.03.3(4) of the Colorado Mined Land Reclamation Act of <br />1978. <br />Historic Monitoring Program <br />Surface Water Monitoring. Baseline surface water monitoring in the vicinity of the <br />Hayden Gulch Loadout facility was conducted by Enviro-Test Ltd. of Lakewood, <br />Colorado from 1977 through 1978. Monitoring was conducted along Dry Creek at <br />locations both up- and downstream of the Loadout, and ~on Stokes Gulch upstream of <br />its confluence with Dry Creek. The monitoring data was compiled, interpreted, <br />reported, and is presented in Attachment 13-1. <br />A surface water monitoring program was initiated at the Loadout facility by H-G <br />Coal Company (HGCC), the facilities previous operator/permittee in 1985. <br />Monitoring consisted of semiannual (spring and fall) monitoring for flow and water <br />quality at two sites established along Dry Creek. The two sites were located <br />approximately 0.8 miles upstream (HGSD1) and 0.6 miles downstream (HGSD2) of the <br />Loadout facilities area. A third stream monitoring site (HGS D3) was established in <br />October, 1993 approximately H00 feet downgradient of the facilities area in an <br />TR-06 1 Revised OS/05 <br />