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<br />Page 2 <br /> <br />Both the Piceance Creek stations indicate reduced flows from historical <br />record. Reduced flows are probably a reflection of several years of less- <br />than-average precipitation. The stations on Yellow Creek indicate less flow <br />on upper, and more flow on lower Yellow Creek than historical record. The <br />reduced flow on upper Yellow Creek is probably a result of Oil Shale Tract <br />C-a's cessation of mine water discharge and possibly reduced precipitation. <br />Increased flow (appro.ximately 11 %) at the lower Yellow Creek Station is <br />probably a result of df;creased downstream depletion effect from the C-a <br />Tract pumpage. <br />Water quality data for 1991 is generally within maximum and minimum <br />results from historical record. No detectable change in water quality was <br />noted, other than upper Yellow Creek Station, which is more reflective of <br />surface water than water quality extremes indicated for period of record. <br />Abnormal extremes were probably influenced by Tract C-a's discharge of a <br />mixture of lower aquifer water and high rates of discharge. <br />If you have any questions, please call Bob Tobin with the USGS in Meeker <br />(878-5086) or myself. <br />Sincerely, <br />~~_ <br />Ed Baker <br />Environmental Engineer <br />cc: EPA <br />CMLRD <br />CDWR <br />BLM (Craig) <br />~sessost.d°~ <br />