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3.6.1.3 Monitoring <br />r1 <br />L_J <br />• <br />Snowmass has collected monthly field measurements for 24 consecutive <br />months at both sites on North Thompson Creek, and for 12 consecutive <br />months on both Middle Thompson Creek and the Roaring Fork River. In <br />addition, water quality samples have been collected at all sites for a <br />minimum of four consecutive quarters. Thirty-two parameters have been <br />analyzed. Two of the samples were collected during baseflow, August <br />and December; and one during peak runoff in June. The fourth sample was <br />collected in March. The data base has established baseline conditions <br />at the Mine Site and on the Roaring Fork River, and shows seasonal varia- <br />tions at the sites. This monitoring frequency is no longer required and <br />a reduced monitoring program is recommended. <br />Snowmass proposes to install weirs at all four locations on North and Mid- <br />dle Thompson Creeks. These weirs will have continuous flow recorders, <br />operating from May through October, which will facilitate the production <br />of a yearly hydrograph which will be submitted to the Division as part <br />of a yearly hydrology report. These weirs will be properly maintained and <br />serviced so that the most reliable data will be accumulated. <br />Daily mean flow records shall be submitted to the Division on a quarterly <br />basis. <br />A plan detailing the type of weir, type of continuous recorder, and exact <br />location of weirs shall be submitted to the Division within two months <br />of this permit approval. <br />In order to obtain accurate samples of surface water at the Mine and Load- <br />out, Snowmass proposes the following surface water monitoring program. <br />Quarterly surface water samples shall be collected up, and down-stream <br />of the permit area on North Thompson Creek, and on the Roaring Fork River. <br />The timing of these samples shall be once during peak runoff, once during <br />early August, once during October, and once at the start of spring snow- <br />melt season. <br />3-84 <br />~yR 1 9 1983 <br /> <br />