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Water Quality <br />Surface Water Sampling, Idaho and Mayday Mine Permit Areas <br />Exhibit U — Attachment U -4 <br />• Measurement of stream flow using a Flow Probe FP 101 Meter. When feasible, the <br />average water velocity was measured for 30 seconds as various points within the <br />stream cross sections as described below for each location; <br />• Measurement of water quality field parameters using a YSI Multi- parameter 556 <br />meter calibrated prior to field activities; and <br />• Collection of surface water samples directly from the streams and packed in ice. <br />Samples for dissolved metal parameters were filtered in the laboratory with a 45- <br />micron filter within 6 hours of sampling. <br />1.1 La Plata River <br />The La Plata River originates in the La Plata Mountains north of the Permit Areas and flows in a <br />southerly direction until it joins the San Juan at the western edge of the city of Farmington, New <br />Mexico. The La Plata River sample locations are identified on Exhibit G, Figure G -1, and <br />include: <br />• SW -1 (Exhibit U, Attachment U -4, Table SW -1 (1 through 6)) up- stream of the <br />Mayday -Idaho Mine permit area; <br />• SW -2 (Exhibit U, Attachment U -4, Table SW -2 (1 through 6)) down- stream of the <br />Mayday Idaho and permit areas, and below the - confluence with Little Deadwood <br />Gulch. The station is located at a site draining the Mayday Mine permit areas and <br />below the wetlands constructed from historical tailings; and <br />• Wetland (Exhibit U, Attachment U -4, Table Wetland (1 through 6)) Lower Beaver <br />pond adjacent to access road. <br />When feasible, flow readings were collected at specified transects across the river channel at a <br />minimum of three locations. Flow readings were collected at approximately 60% of the water <br />depth at each location. Field parameters (Exhibit U, Table U -1) indicate that the water is aerobic <br />and within a neutral pH range with low dissolved salts. <br />1.2 Deadwood Gulch <br />Wildcat Mining Corporation <br />May Day Idaho Mine Complex — 112d Permit Application <br />Revised August, 2011 <br />Exhibit U — Attachment U -4 <br />Little Deadwood Gulch flows westerly ,and drains -into the La Plata River. The stream flows <br />through both the Mayday No. 1 and Mayday No. 2 Permit Area. Two sample locations were <br />selected: <br />• DG -1 (Exhibit U, Attachment U -4, Table DG -1 (1 through 5)) up- stream of the <br />Mayday Mine permit area; and, <br />• DG -2 (Exhibit U, Attachment U -4, Table DG -2 (1 through 5)) immediately down- <br />stream of the Mayday Mine No. 2 bench, adjacent to the toe of an historical waste <br />rock pile. <br />Page 2 of 3 <br />