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2.05.6(3)(b)(iv) <br />Records of the above monitoring will be kept on site and <br />submitted to the Division quarterly and with the annual hydrology <br />report. Significant mine inflows that may or may not be pumped, <br />will be recorded and promptly reported to the Division. <br />The spring monitoring data, Springs 1 - 11, interpretation and <br />correlation with past monitoring will be submitted with the 1992, <br />1993 and 1994 annual hydrologic reports. <br />Flow in the ephemeral and intermittent streams and Hubbard <br />Creek will be estimated by calculating the velocity of flow through <br />a measured cross-sectional area of the stream channel. Flow in the <br />North Fork of the Gunnison will be obtained from the nearby USGS <br />gauging station. <br />The sealing of all of the Somerset Mine portals precludes <br />obtaining underground water samples. Wells B-6 and H-10 are used <br />to monitor groundwater inflow and quality in order to predict the <br />extent of flooding in the underground workings. <br />The operations of the Sanborn Creek Mine are not expected to <br />impact the hydrologic balance of the area. Surface water moni- <br />toring points S-1 and S-2 are designed to sample the flow in <br />Sanborn Creek above and below the disturbed area. Sanborn Creek <br />will receive mine dewatering water from the mine. This source of <br />water will cause Sanborn Creek to flow year around. Monitoring <br />point S-1 flows during spring run-off and significant precipitation. <br />events. The disturbed area and mine water could affect the quality <br />of water in Sanborn Creek only when there is flow at S-1. For this <br />reason, S-2 will be monitored only if S-1 has flow. <br />Surface water monitoring point P-1 is located in a sediment <br />trap drop inlet located near the portal area. This monitoring <br />point is designed to assure that the surface run-off from Small <br />Area Exemption A and C meets the requirements of Rule 4.05.2(3). <br />This monitoring point is further discussed in section 2.05.3(4)(H). <br />Surface water monitoring points U-1 and C-1 are designed to <br />verify that the underground mine does not have an adverse effect on <br />the quality or quantity of run-off in the unnamed drainage or Coal <br />Gulch which are both ephemeral streams. Monitoring results are <br />expected to be similar to those collected in 1981 and 1982. <br />Surface water monitoring points NF-1 and NF-2 are designed to <br />sample the flow in the North Fork of the Gunnison River above and <br />below the Sanborn Creek Mine disturbed area. Monitoring results <br />are expected to be similar to those collected in 1981 and 1982 and <br />further, no significant difference in cuality is expected between <br />the upstream and downstream monitoring points. <br />2.05 - 46iv <br />Rev. 1:08-19-93 <br />