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• • <br />Cotter Corporation License 369-01 ReneRal App/ication 2003 Environments/AssessmentReport <br />2.7.4 Groundwater Model <br />In ]999 the U_S_ Geological Survey published Water-Resources Investigations Report 98-4229 titled <br />Ground-Water Hydrology and Simulation of Five Remediation Alternatives for an Area Affected by <br />Uranium-Mill Effluent near Canon City, Colorado. This report, authored by Edward R. Banta and Daniel <br />T. Chafm, presents a quantitative description of the ground-water hydrology of the unconsolidated <br />deposits and near-surface bedrock of the Mill Facility and Lincoln Park area. It also documents the <br />development and calibration of ground-water flow and contaminant-transport models of the study area. <br />In addition to the natural ground-water system, the models simulated remedial actions that had been <br />implemented in the study azea as of 1996. The purpose of the numerical models was to serve as tools for <br />comparing the possible effects of the proposed remediation alternatives on uranium and molybdenum <br />concentrations for 50 years from the start of a particulaz remediation alternative. <br />The five remediation alternatives modeled in the study are described in section 4.2.6.1.5 of this <br />application and a summary of the results of the model alternatives is also included in that section of the <br />application. <br />2.8 Meteorology <br />Meteorological conditions at the Milling Facility are measured and recorded by a meteorological <br />monitoring station that is located at the mill site. Historical data at that location indicate the following <br />meteorological observations: <br />1) Temperature: <br />• annual average (Fahrenheit) temperature is in the mid 50's with annual averages <br />ranging in the low 40s to high 60s. <br />• extremes range from lows of more than 20 degrees below zero to highs over 100 <br />degree F.. <br />• temperatures below zero are usually brief and temperatures over 100 are <br />infrequent <br />2) Atmospheric moisture: (humidity) is low, typically in the 30% range <br />s) Precipitation: <br />• annual average is 12 inches, with lows near 6 inches and highs of 24 inches <br />• 68% of precipitation occurs during the six months from April through September <br />Page 68 of 190 <br />Cotter Corporation MFG, Inc. <br />F.~I81o77~Filee hom Ccraavudd~Emiromnenmi avsesemrntreport.finel.doc 68 September 11, <~~3 <br />