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iii-iiiiiiiiiiiuiu , <br /> <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmem of Natural Resources <br />1 3 U Sherman 51., Room 215 <br />Denver, Colorado 80203 <br />Phone: p031 866-3567 <br />FAX: 003)83?-8106 <br />To: Rally Brickaon- <br />From: Barbara Pavlik <br />Date: July 12, 1995 <br />~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Governor <br />lames 5. LochheaA <br />E¢rculire Due~mr <br />Michael 6. Long <br />Division Dveclor <br />Re: Review of Aaaual Hydrology Report <br />Seneca II Hine (C-BO-005) <br />i have completed a review of the groundwater portion of the Annual <br />Hydrology Report for the Seneca II Mine. A summary of my review is <br />presented below. <br />The operator did a fine job of tabulating, presenting and <br />summarizing the data with one notable exception. A Hydrologic Site <br />Location Map was not included with the AHR. Rather, page 1 advises <br />the Division to insert the map from the 1993 report into the <br />current AHR. Tsk, tsk. Please advise the operator that a map <br />should be submitted with each annual report so that each AHR can <br />comprise a stand-alone document for public and the Division's <br />review. <br />In general, water levels were deeper this year than in previous <br />years in response to a decrease in precipitation. One well <br />completed in the Wolf Creek Overburden/Wadge Underburden went dry <br />in September of 1994. Two wells in the Wolf Creek Overburden/Wadge <br />Underburden have expressed a declining water level trend since <br />February, 1990. Additionally, one well in the Wolf Creek <br />Overburden/Wadge Underburden and one well in the Wolf Creek Coal <br />have expressed slowly declining water levels since January, 1986. <br />Well GW-14-WC was mined out in the winter of 1993-1994. Therefore, <br />a technical revision should be submitted to propose the elimination <br />of monitoring requirements for this well. <br />The operator has compared ground water quality data with irrigation <br />standards although groundwater in the area surrounding Seneca II is <br />not pumped for irrigation or livestock watering. Average annual <br />TDS concentrations in two alluvial wells, one Wadge Underburden <br />well, one Wolf Creek Overburden well, and two spoil spring wells <br />were higher than historic levels. Additionally, manganese, iron, <br />fluoride, and pH exceeded the irrigation standards at many of the <br />wells. Last year's AHR review specifically requested that the <br />operator address these exceedences (for example, what trends are <br />