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Groundwater Quality <br />• Data was collected from each of the alluvial wells (MWJC-l, MWLC-l, MWLC-2, and <br />MWPC-1) during the 1996-2000 baseline monitoring period. Alluvial wells MWLO-W <br />and MWLO-E at the loadout facility were installed during April 2002. During 2005, each <br />of the wells was monitored semi-annually for water level and field parameters and water <br />samples were obtained annually for laboratory analyses. Summary tables showing the <br />results from all the alluvial wells are included in Appendix III and Lab Reports in <br />Appendix IV. <br />Results from the laboratory analyses of baseline samples were interpreted through the use <br />of Stiff diagrams. Copies of these diagrams aze also included in Appendix III. The <br />principal water type observed in the alluvial wells is acalcium-sodium bicazbonate type. <br />This water is typically neutral with low hardness, and low to moderate salinity .The pH <br />ranges from 7.42 to 8.7 and hazdness ranges from 208 mg/L to 605 mg/L. Total dissolved <br />solids in the samples ranged from 440 to 1310 mg/L (filterable residue). Discharge <br />associated with coalbed methane has increased dissolved solids in streams and alluvial <br />well waters. Stations MWJC-1, MWLC- 1, MWLC-2, and MWPC-1 show changes from <br />the other samples taken during the period of record. <br />Surface Water Quantity <br />• Watersheds in the area display dendritic drainage patterns characteristic of flow through <br />relatively flat-lying, generally uniform geologic features (Leer, et al., 1982). Eleven <br />drainage basins aze within the pemvt boundary or received drainage from within the <br />permit boundary. All of these drainages are included in the Purgatoire River drainage. <br />The watersheds contain both forested and open slopes. <br />Surface Water Stations <br />Flow data was collected from each of the monitoring stations (Map 2.04.7-1) semi- <br />annually during 2005 (Appendix ln. Flows were determined from direct measurements <br />of the water in the stream. Analyses of flow data was performed from hydrographs <br />generated from the flows. Copies of these hydrographs are also included in Appendix II. <br />Analyses of the hydrographs from the Lorencito Stations indicate a similarity of flow. <br />Flows varied seasonally dependent on surface run-off and precipitation. Flows at the side <br />canyon stations were extremely low with some stations exhibiting no flow conditions <br />over several months. <br />n <br />LI <br />6 <br />