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preservation and analysis techniques and procedures used at the <br />• Nucla Mine are the same as those previously described in Section <br />III.A. for the surface water operational monitoring program. A <br />qualification which needs to be made here is that the specific <br />procedure by which ground water samples have been taken from Nucla <br />Mine monitoring wells varies slightly from well to well. The <br />procedure used depends upon one or more of the following variables: <br />casing diameter, rate of recovery, casing storage volume, depth to <br />water and site accessibility. As a result, a summary of the <br />sampling procedures for each well is detailed below. <br />Well No. Sampling Procedures and Remarks <br />GW-N3 Set pump at 65 feet; pump 40 to 70 <br />gallons and sample. <br />GW-N4 Set pump at 20 feet; pump 40 to 50 <br />gallons and sample. <br />u <br />GW-N9 Set pump at 65 feet; pump 30 to 90 <br />gallons and sample. <br />GW-N10 Dry well. <br />B. Water Levels <br />Static water level measurements have been taken on monitor <br />wells GW-N1 through GW-N11 on a monthly basis since the fall of <br />1979. Recently installed monitor wells are also being <br />monitored on a monthly basis. All of the water level data are <br />presented in tabular and graphical form in Appendix E. <br />1. Wells GW-N1 and GW-N1P1 -- Underburden <br />Water level measurements have been taken at these two wells on <br />a monthly basis since August, 1979. The water level hydrographs <br />show that there is a 10-foot seasonal fluctuation in static water <br />• <br />73 <br />