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Y. Hydrologic Balance: Surface Water - Rules 2.04.3, 2.04.7, 2.05.3(4 <br />an <br />Surface Water Baseline Information <br />Information dealing with baseline data for surface water quality and quantity <br />in the permit and adjacent areas is provided in Section 2.04.7,2 of the permit <br />application. There are two drainages that will be affected by surface <br />disturbance of the mine. The Engleville Gulch which contains an ephemeral <br />stream and the Purgatoire River. The ephemeral stream in the Engleville Gulch <br />which extends through the permit area is a tributary of the Purgatoire River. <br />The Purgatoire River, a tributary of the Arkansas River, is the major surface <br />drainage feature in the area. The water in the Purgatoire is a <br />calcium-bicarbonate type water. Total dissolved solids concentrations in the <br />area run below 300 mg/1 throughout the year. Limited water quality data was <br />provided for the ephemeral stream in the Engleville Gulch due to infrequent <br />runoff events. The SOAP study which was conducted by Panorama Resources, Inc. <br />provided data from samples collected for the months of April and May. The <br />data analysis showed none of the sample parameters exceed the EPA standards <br />for drinking water. <br />High flows occur in response to snow melt and precipitation events. <br />Instantaneous flows were measured at five locations (Exhibit AA) during <br />April 1988 and May 1988. Flows were all under 0.1 cfs in the April <br />measurements but in May during a precipitation event flows as much as 0.17 cfs <br />were recorded. The operator had two monitoring stations along the <br />Engleville Gulch. There were no measured flows in Engleville Gulch for the <br />remainder of the water year. <br />Further discussion of water quantity and quality and monitoring of surface <br />water as it relates to the proposed operation is given in Section IX of this <br />Findings Document. <br />-8- <br />