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Lorencim Carron Mine Annual Hydrologic MonitorinX ReDOrt - 2001 <br />MWPC-1) during the 1996-2000 baseline monitoring period. Alluvial wells MWPC-2 and <br />MWPC-3 at the loadout facility are proposed to be installed during April 2002. During 2001, <br />each of the wells was monitored semiannually for water level and water samples were obtained <br />for laboratory analyses in November 2001. Summary tables showing the results from all the <br />alluvial wells are included in Appendix 1. <br />Results from the laboratory analyses was interpreted through the use of trilinear and Stiff <br />diagrams. Copies of these diagrams are also included in Appendix 1. The principal water type <br />observed in the alluvial wells is acalcium-sodium bicarbonate type. This water is typically <br />neutral with low hardness, and low to moderate salinity. The pH ranges from 7.42 to 8.7 and <br />hardness ranges from 208 mg/L to 605 mg/L. Total dissolved solids in the samples ranged from <br />440 to 1310 mg/L (filterable residue). Discharge associated with coalbed methane has increased <br />dissolved solids in streams and alluvial well waters. Stations MWJC-1, MWLC-1, MWLC-2, and <br />MWPC-1 show changes from the other samples taken during the period of record. <br />Surtace Water Quantity <br />Watersheds in the area display dendritic drainage patterns characteristic of flow through relatively <br />flat-lying, generally uniform geologic features (Leet, et al., 1982). Eleven drainage basins are <br />within the permit boundary or received drainage from within the permit boundary. All of these <br />drainages are included in the Purgatoire River drainage. The watersheds contain both forested <br />and open slopes. <br />Surtace Water Stations <br />Flow data was collected from each of the monitoring stations (Map 2.04.7-1) semiannually during <br />2001 (Appendix 2). Flows were determined from direct measurements of the water in the stream. <br />Analyses of flow data was performed from hydrographs generated from the flows. Copies of <br />these hydrographs are also included in Appendix 2. Analyses of the hydrographs from the <br />Lorencito Stations indicate a similarity of flow. During the first quarter, January through March, <br />flows were low or non-existent a[ some stations. During the higher precipitation second quarter, <br />flows were higher especially during May when runoff was high. Flows at the side canyon stations <br />were extremely low with the stations exhibiting no flow conditions over several months. <br />Spring and Seep Stations <br />During 2001, four springs were monitored in August for flow and field parameters (SPAC-1, <br />SPCC-1, SPCWC-1, and SPPC-1). Flow data and hydrographs are included in Appendix 3. <br />Spring SPAC-1 and SPPC-1 had no flow, but a seep was noted. Springs SPCC-1 and SPCWC-1 <br />were dry. <br />AHR-00.695\Aprii Z6, 2002 ~ 6 <br />