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§2.05 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING ACTIVITIES - <br />MINIM[7M REQUIREMENTS FOR OPERATION AND RECLAMATION PLANS. <br />2.05.6 Mitigation of Surface Coal Mining operation impacts. (Cont'd.) <br />(1) (b) (iii) (Cont'd.) <br />Baseline Hvdrologv monitorina Program - Permit and Adiacent Areas <br />In 1982 and 1983, the operator instituted a hydrology monitoring program <br />to obtain baseline information on several representative springs, ponds, <br />streams, and groundwater wells. Several water resources from each of the <br />five drainages within or adjacent to the permit area were chosen for <br />monthly monitoring (see Volume 9, Map No. 4-1). These water resources, <br />springs 16 through 31, ponds 81 through 90, stream monitoring stations <br />SW-1 through SW-12, and groundwater monitoring wells DH-58, DH-60, DH-65, <br />DA-68, DH-?0, DH-76, and GR-77, were chosen as representative resources <br />based upon the locale and distribution in the drainages, the use of the <br />water, whether the water resource was an adjudicated water right, <br />perennial discharge, and the site acceptability. This past water <br />monitoring program is discussed in the following sections. <br />In discussions between the operator, CMLRD, and the BLM in Montrose, the <br />involved parties concluded that an emphasis should be given to the <br />hydrologic monitoring within the area to be impacted by the mining in the <br />next five years and adjudicated water rights within the permit area. As a <br />result of past higher production rates, a majority of the permit area was <br />included by the operator in the five-year mine plan area. The operator's <br />current projection of the five-year mine plan encompasses a much smaller <br />portion of the permit area and hydrologic monitoring is now limited to the <br />latest projected five-year mine plan area and additional areas which have <br />recently been mined. <br />Past Surface Water Monitoring - Permit and Adiacent Area <br />The operator divided the surface water monitoring requirements into <br />streamflow monitoring and pond monitoring. <br />The operator installed and monitored eight continuously recording stream <br />monitoring stations in the Stevens Gulch, East Roatcap Creek, Main Roatcap <br />Creek, and Terror Creek drainages. In 1982, the operator retained Watec, <br />Inc. of Aurora, Colorado, to calculate flume sizings and install stream <br />gauges SW-1, SW-2, SW-5, and SW-6. Piteau and Associates of Golden, <br />Colorado, installed stream gauges SW-9, SW-10, SW-11, and SW-12 in 1983. <br />Most of these stations consist of a Parshall flume, a stilling well, and <br />a 32-day Steven's type "F" recorder. The monitoring <br />I • <br />/~12-108 <br />hPPROV69 <br />~ /z4/o 4 <br />Revised 12/10/93 <br />Revised 9/21/01 <br />116 <br />