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.__IIIIIIIIIIIIIIIIIII ~ ~ ,~~ <br />PEABODY COAL COMPANY <br />ROCKY MOUNTAIN DIVISION <br />fOa7a [A!T NARVARD AV[NY[ <br />aUITC 400 <br />D[NV[R. COLORADO •Oaa1 <br />son aarsaoa <br />February 22, 1984 <br />Mr. Ralph Poulsen, Director <br />Bookcliffs Laboratories <br />737 Lincoln Avenue <br />P. 0. Box 772961 <br />Steamboat Springs, Colorado 80477 <br />Dear Ralph: <br />RECEIVED <br />FEB 2 41984 <br />M~ Co o Dept of Nata al(Resoarces N <br />Aa we discussed on the phone February 10, a number of our Seneca II <br />Mine water samples were reportedly higher than normel in cadmium <br />concentration due to some positive instrument drift during the analytical <br />run that went unnoticed. You, subsequently, sent us corrected true <br />values for. 11 sample analyses. i greatly appreciated your immediate <br />attention to this matter. <br />I have noticed, however, that there are a number of additional <br />analyses for cadmium and also lead, which may 'have also been affected <br />by instrument drift. In the table which follows, please note that <br />for a particular sample type (i.e., ground water, NPDES, etc.), the <br />analysis dates are given for the particular element analyzed which <br />may have experienced positive instrument drift. <br />Mine water Type Computer ID Cd Pb <br />Seneca II and IIW Grd H2O 0260 W_ 11/02/83 07/08/83 <br /> 11/05/63 11/02/83 <br /> 11/18/83 11/05/83 <br /> 11/18/83 <br /> 11/21/83 <br /> 11/29/83 <br /> 12/03/83 <br />Seneca II NPDES 0260 D_ 11/05/83 11/05/63 <br />Nucla Grd H2O 0262 W_ 06/30/83 06/30/63 <br /> 11/14/83 11/14/83 <br />Nucla Surf H2O 0262 S_ 11/14/83 11/14/83 <br />Nucla NPDES 0262 D 11/14/83 11/14/83 <br />