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monitoring wells, such as we1120-4 that has shown it is contaminated with cement and should no longer <br />be used for water quality sampling. A monitoring program for temporary cessation periods is also being <br />added to ensure continuous ground-water monitoring even during periods when the permiee is not <br />actively mining. <br />American Soda with input from EPA, BLM and CDMG, developed an updated water monitoring <br />plan that incorporates the above modifications to streamline the monitoring program and focus it on <br />meaningful parameters. American Soda requested that the original Water Monitoring Plan, Appendix J <br />of the permit, be replaced with the updated Ground Water, Surface Water, and Process Monitoring Plan <br />for the Yankee Gulch Sodium Minerals Project, dated September 2004. <br />American Soda L. L. P. began an extensive monitoring program in association with permitting <br />its solution mining project to chazacterize the ground water of Yankee Gulch in the Piceance Creek <br />drainage. Baseline monitoring began in 1999, 15 months prior to initiation of Phase I Commercial <br />Production. In cooperation with the EPA, BLM and CDMG, a monitoring network was established that <br />included wells up-gradient, down-gradient, and cross-gradient from the proposed Commercial <br />Production wells located in the 0-5 yeaz mining panel. A chart of relative pump set elevations regazding <br />the monitoring wells is shown in Figure 1, which provides a graphic overview of the various water <br />bearing zones. The wells aze grouped according to the aquifer and zone. Only one alluvial well, Well <br />19-3, is not represented on this diagram. Well 19-3 is a shallow well down gradient of the proposed site <br />of the evaporation pond. Well 19-3 well is not shown because the pond was never built and the well has <br />never had enough water in it to sample. <br />Figure 1 -Pump Set Elevations <br />6700 <br />6500 <br />c 6300 <br />J <br />~ 6100 <br />5900 <br />SSS~~~ Alluvial <br />~ 5700 <br />0 <br />a <br />5500 Uinta <br />LL <br />~ 5300 <br />•a° A Groove <br />m <br />~ 5100 <br />w B Groove <br />4900 <br />4700 <br />4500 <br />rv ry o m m m <br />Well Head Ele~etion at lop <br />Sample Line Lanplh - Cdumn <br />®PUmp Set Eleietion <br />Dissolution <br />ry <br />Draft Addendum to SOB For Modification No. 9, UIC Area Permit No. CO30858-00000 Page I S of 27 <br />