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<br />i <br />Mr. Richard A. Mills - 4 - March 21, 1986 <br />some massaging of the data, as presented in the Empire AHR: annual <br />compilations of the average, standard deviation and range for each <br />parameter at each site. Cumulative averages of multiple years' data <br />is inappropriate, however, as the Division is interested in trends. <br />5) The calculation and reporting of mass balance on each sample which <br />has major cations and anions analyzed would improve our evaluation <br />of your quality control, as mentioned earlier. <br />6) Please utilize the "Remarks" column on the field parameters <br />tabulations to comment on pertinent weather and hydrologic <br />conditions so we can distinguish between storm events and ambient <br />high flow conditions. <br />7) Graphical analyses of the data will expedite the interpretation of <br />the hydrology. We would like to see <br />a) Hydrographs of streamflow and groundwater well depth data. <br />b) Cumulative graphs (baseline to present) of total iron, TDS and <br />7SS at all surface water sites as well as cumulative graphing <br />of all parameters which are at levels 75 percent of receiving <br />stream standards or applicable irrigation standards. <br />e) Piezometric-style mapping is of salt plume concentrations in <br />aquifers. <br />We hope that the recommendations presented herein will improve the quality of <br />Colorado Yampa Coal's monitoring program and future AHRs. If you have any <br />questions, do not hesitate to call. <br />SinceCely~___ <br />Catherine W. Begej <br />Reclamation Specialist ~%~ <br />CWB/srs <br />cc: Dan Mathews <br />8583E <br />