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Ll <br />Resonse to DRMS C0177177e171S <br />EnV1Mnment81Pr01eC11Z2n P/an, <br />Denison SundayMbeS Group <br />the stratigraphic interval that contains the uranium and vanadium ore <br />bodies in the mining areas. The compliance limit will be based on a <br />minimum of five quarterly samples from the three wells (minimum <br />sample support of fifteen samples). Data collected to date from the <br />subsurface monitoring well nest is attached. Denison intends to continue <br />sampling these wells for a minimum of two additional quarters. <br />Comment 8 Fina1DR?ISReoort. 11.19 9'aterOua114,ffonilor-ilze, rt (Denison, Exhibit H- <br />1, Compliance Monitoring Analytical Parameters) <br />DRMS Comment: The list of analytes must include Radium 226 and Radium 228. <br />Temperature should be included as afield measurement. Applicant is advised <br />that pH, conductivity, ORP, and DO must also be measured in the field. <br />Response Agreed. These parameters will be added to the analyte list for the <br />proposed monitoring wells. Replacement pages to the EPP are attached. <br />Comment 9 4ddendum to theflvdrologiL-Evaluation [NOTE: Reference should be <br />Addendum to the Environmental Geochemistry Investigation of Soil and Rock <br />Materials, Sunday Mines Group.] <br />1- Should the number in the last column of the last row of Table I be 1.96E+-01 <br />rather than 9.78E+00? <br />• <br />C <br />Response As shown in the output file for the model run, using an hourly <br />precipitation rate of 4 centimeters per hour (cm/hr), the predicated <br />runoff in the UNSAT-H simulation is 9.78 centimeters (cm). Therefore, <br />the number in the last column of the last row of Table 1 is not a typo. The <br />hourly precipitation rate is defined in the UNSAT-H model using a <br />variable called "HPR". The annual runoff value of 9.78 cm predicted for <br />a precipitation rate of 4 cm/hr is the same as predicted for a <br />precipitation rate of 2 cm/hr. All four UNSAT-H runs for the HPR <br />sensitivity analysis were based on the same precipitation data set. This <br />data is from the year 1968, which is an actual year in the precipitation <br />record that has total annual precipitation as close as possible to the long- <br />term average. The maximum daily precipitation in the 1968 data set is <br />0.75 inches (1.9050 cm). Therefore, for model runs using an hourly <br />precipitation rate of either 2 cm/hr or 4 cm/hr, all precipitation is <br />applied in the first hour of the model. This results in the same annual <br />runoff estimates for HPR values of both 2 and 4 cm/ hr. <br />Final Sunday Mines RTC_v2.doc