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<br />Duke Engineering <br />& Services_ <br />A Uubr 6rr~ Campnry <br />9111 RasearOh liOUlaverd <br />Austin, TX 78758 <br />August 18, 2000 '/ <br />I b : ~ V-1 G- <br />~~c°~' C . ~G.w~~'. ~v ~eKtr~o ~e~r i C ~~~ S <br />III IIIIIIIIIIIIIIII <br />999 <br />So~~ <br />512 425-2000 <br />Fax 512 425-2099 <br />Allen C. Sorenson <br />Reclamation Specialist <br />Division of Minerals and Geology <br />1313 Sherman St., Room 2l5 <br />Denver, CO 80203 <br />Subject: Technical Revision TR-003, Yankee Gulch Sodium Minerals Project, <br />Permit No. M-99-002: Potentiometric Maps <br />Deaz Mr. Sorenson, <br />in response to Adequacy Item #1, Technical Revision TR-003, Yankee Gulch Sodium Minerals <br />Project, Permit No. M-990002, and at the request of Ms. Celina Akin, American Soda, L.L.P., <br />we enclose two potentiometric maps of the Upper and Lower Aquifers covering the vicinity of <br />the Zero to Five Year Mining Panel at the Yankee Gulch Sodium Minerals Project, Piceance <br />Basin, Colorado. These maps were prepared using the July 2000 water-level data collected by <br />American Soda personnel from the American Soda monitoring wells in the vicinity of Zero to <br />Five Year Mining Panel. To provide a consistent comparison of these data, the as-measured <br />water levels recorded in the monitoring wells have been normalized to an equivalent freshwater <br />head. <br />The contours of potentiometric head were drawn using the kriging function in the Golden <br />Software package SURFER (Win32), Version 6.O1. Because of the variable data density in the <br />Upper- and Lower-Aquifer measuring points, we did not attempt to extend the calculated <br />potentiometric contours beyond the field of the data. However, both the Upper- and Lower- <br />Aquifer maps are presented at the same scale for ease of comparison. <br />If you have any questions concerning these maps, please do not hesitate to call me. <br />.~..~: ere ~ p~ <br />Gf.(.«r~t~' <br />Dr. Geo aulnier Jr. <br />Enclosure: Potentiometric Maps <br />cc: Celina Akin, American Soda, L.L.P. <br />Ed Cooley, American Soda, L.L.P. <br />