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April 22, 1999 • • Pnge 17 <br />American Soda and sent to aState ofColorado-certified lab. Discharge measurements and collection <br />ofsamples will be consistent with USGS protocols. <br />4.3 Spring and Seep Monitoring-Yankce Gulch Lcasc <br />Springs and seeps at the Yankee Gulch Lease will be monitored for dschazge and water <br />quality. The spring and seep survey will encompass the lease boundary and the area between the <br />southern edge of the lease boundary and the northern boundary of Section 15 (northern lease <br />boundary). The spring and seep locations will be determined by Global Positioning Satellite (GPS) <br />and map and compass methods, and will be field documented on a base map. Dischazges will be <br />measured by direct measurement where sufficient flows exist, and by visual estimation where direct <br />measurement is not practical due to low flow or an obstructed source. A feature having a dischazge <br />of less than I gpm will be designated a seep. A feature with a dschage of greater than or equal to <br />1 gpm will be designated a spring. <br />The springs and seeps will be monitored on a twice per year basis (in the spring and fall of <br />each year), corresponding to high flow and low flow conditions, during the baseline monitoring <br />period and during commercial operations. During the baseline monitoring period, the flow rate will <br />be measured, and features having sufficient flow and access will be sampled for the water quality <br />parameters listed in WQ2 (Table 3). The water quality samples will be collected according to <br />procedures detailed in Appendix C. After the baseline period, only field parameters (pH, <br />temperature, and conductivity) will be collected. The occurrence of springs and seeps that were not <br />documented in the baseline surveys will be documented during subsequent surveys and measured <br />for flow and quality. <br />4.4 Precipitation Monitoring <br />A rain gauge will be located at the Yankee Gulch Lease site. The rain gauge will be located <br />cleaz of overhead obstruction. It will be monitored daily and the amount of precipitation recorded <br />monthly along with date, time, and other pertinent information. <br />4.5 Monitoring after Cessation of Commercial Operations <br />At such time as the Yankee Gulch Project may permanently cease commercial operations, <br />there may be a need for continued monitoring of the surface water system. In the event that the <br />project permanently ceases commercial operations, American Soda will continue to monitor the <br />Agapilo Associates, Inc. <br />