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1 Draft: March 31, 1999 Page 13 commercial operations. During these quazterly monitoring events, the dischazge will be measured and Piceance Creek will be sampled for the expanded set of parameters listed in WQ2 (Table 3). The water quality samples will be collected according to procedures detailed in Appendix C. A transit loss study will be conducted along the section of Piceance Creek that borders the Yankee Gulch site. The USGS will conduct the study. The transit loss study will be used to estimate the gaining and/or losing characteristics of the stream. The purpose of the study is to evaluate the location of the existing and proposed alluvial monitoring wells, and assess the value of additional alluvial monitoring well locations. Crest stage monitoring stations will be installed by the USGS at Piceance Creek, adjacent 1 to the upstream and downstream monitoring wells. Crest stage monitoring stations record high water levels. ' 4.2 Parachute Creek Monitoring 1 1 1 1 ~~ Parachute Creek monitoring will include dischazge and water quality. Pazachute Creek will be monitored at proposed upstream and downstream gauging stations. The baseline dischazge and water quality of Parachute Creek, in the vicinity of the site, will be established for five quarters (13 months) prior to the start of commercial solution mining operations, unless applicable USGS baseline data aze obtained. The surface water stations will be monitored on a once per quarter basis during the baseline monitoring period and during commercial operations. During these monitoring events, the discharge will be measured and Parachute Creek water will be sampled for the parameters listed in WQ2 (Table 3). The water quality samples will be collected in accordance with the procedures detailed in Appendix C. 4.3 Spring and Seep Monitoring-Yankee Gulch Lease Springs and seeps at the Yankee Gulch Lease will be monitored for flow rate and water quality. A Spring season baseline spring and seep survey will be conducted during the peak flow period in late spring of 1999. A second spring and seep survey will be conducted prior to commercial operations in the fall of 1999 to document low flow conditions. The spring and seep survey will encompass the lease boundary and the area between the northern edge of the lease boundary and the northern boundary of Section 15. The spring and seep locations will be determined by Global Positioning Satellite (GPS), and map and compass methods, and will be documented on a Agapito Associates, Inc.