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• 2.0 MONITORING METHODS <br />2.1 SURFACE FACILITIES <br />During each monitoring event, in-situ water quality measurements of temperature, <br />conductivity, and pH were made. An expanded list of water quality analyses was conducted <br />during the annual sampling period from samples that were sent to a commercial laboratory. <br />Prior to any field samplings, the field meters were calibrated to known standards. <br />Water quality or flow measurements were conducted by a number of methods. At the <br />beginning of the program, a straight, flat, stable reach of each stream was selected as a <br />sampling location. Near the down stream end of the reach, a cross-section was surveyed <br />perpendicular to the stream flow and permanently marked with stakes and flagging. Flow was <br />measured with a Teledyne-Gurley Model 625 Pygmy type current meter (or similar type meter) <br />using the USGS six-tenths-depth method. Lesser flows were monitored using a Parshall Flume <br />with a two inch throat. <br />2.2 GROUND WATER SITES <br />Depth to water below top of the well casing was measured to the nearest tenth-foot using an <br />electric line water level detector. Water quality was sampled in the field directly from the <br />• wells with a hand bailer. The wells were cleared by bailing at least three columns of water (or <br />bailing the well dry and allowing recharge) prior to collecting the sample. Equipment and <br />procedures used for water chemistry analysis were consistent with those described above for <br />surface water. <br />3.0 HYDROLOGIC CONSEQUENCES <br />Hydrologic consequences of mining activities are considered from two primary perspectives: <br />effects on water quantity and effects on water quality. These effects are addressed through flow <br />and water quality measurements of springs and seeps, streams and rivers, ponds and direct <br />discharges, and depths to water level and water quality of alluvial wells, and bedrock wells. <br />However, water quantity and quality are not independent functions of each other. Surface water <br />and groundwater quantities and water uses are components of the hydrologic balance of the <br />region. Natural water quality varies as a function of flows, type (groundwater or surface water), <br />and location. Discharge of underground mine water and runoff or discharge from mine surface <br />activities modify natural water quality. Analysis of potential impacts associated with mining <br />and refuse disposal has been completed and are contained in the mine permit document. This <br />report focuses on describing the water quality and quantity of the Purgatoire River, side <br />canyons and groundwater within the permit and adjacent areas. <br />13