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• 2.0 MONITORING METHODS 2.1 SURFACE FACILITIES During each monitoring event, in-situ water quality measurements of temperature, conductivity, and pH were made. An expanded list of water quality analyses was conducted during the annual sampling period from samples that were sent to a commercial laboratory. Prior to any field samplings, the field meters were calibrated to known standazds. Water quality or flow measurements were conducted by a number of methods. At the beginning of the program, a straight, flat, stable reach of each stream was selected as a sampling location. Near the down stream end of the reach, across-section was surveyed perpendiculaz to the stream flow and permanently mazked with stakes and flagging. Flow was measured with aTeledyne- Gurley Model 625 Pygmy type current meter (or similaz type meter) using the USGS six-tenths- depih method. Lesser flows were monitored using a Parshall Flume with a two iach throat. 2.2 GROUND WATER SITES Depth to water below top of the well casing was measured to the neazest tenth-foot using an electric line water level detector. Water quality was sampled in the field directly from the wells with a hand bailer. The wells were cleazed by bailing at least three columns of water (or bailing • the well dry and allowing recharge) prior to collecting the sample. Equipment and procedures used for water chemistry analysis were consistent with those described above for surface water. 3.0 HYDROLOGIC CONSEQUENCES Precipitation in the 2006 calendaz yeaz was neaz average with the above normal eazly winter snow events in October and December and summer thunderstorms from late July to early August. The first and second quarters were dry with only occasional light precipitation. Hydrologic consequences of mining activities aze considered from two primary perspectives: effects on water quantity and effects on water quality. These effects are addressed through flow and water quality measurements of springs and seeps, streams and rivers, ponds and direct discharges, and depths to water level and water quality of alluvial wells, and bedrock wells. However, water quantity and quality are not independent functions of each other. Surface water and groundwater quantities and water uses aze components of the hydrologic balance of the region. Natural water quality varies as a function of flows, type (groundwater or surface water), and location. Discharge of underground mine water and runoff or discharge from mine surface activities modify natural water quality. Analysis of potential impacts associated with mining and refuse disposal has been completed and aze contained in the mine permit document. This report focuses on describing the water quality and quantity of the Purgatoire River, side canyons and groundwater within the permit and adjacent azeas. 13