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.d ~ 1f1 r: <br />rnicrni~.~rliru; nrlo r_r~tinr3crrlnnFNTa1_ hwisioru <br />In7s Prole c~+ove r:ono <br />P.O. 90X 7'?n OIr3 <br />Si"eAMnO~I" GP nll•I(~:~, (:U 30477 <br /> <br />March 8, 1988 <br />Mr. Craig Springer <br />Bear Coal Company <br />P.O. Box 518 <br />Somerset, Colorado 81434 <br />Dear Craig: <br />ems. ~a.,,~~.,t.r~`v°w ~T:-'.. <br />(3031 879-G 1.G0 <br />TELEX !910-100-3 rt F,n <br />We have reviewed the laboratory data for Monitor Well AA-1 and have <br />reached the following conclusions. The eratic nature of the <br />conductivity and the TDS coupled with the related changes in calcium, <br />sodium, and sulfate indicate that representative ground water samples <br />are probably not being taken. This can result from one or mare <br />reasons which include the following: <br />e Well is silted in and should be redeveloped <br />e Sample taken without removing two (2) casing volumes from <br />the well and allowing well to r•e-charge prior to sampling <br />a Surface water and sediment from shale outcrops have <br />contaminated the well <br />Given one or more of these problems we suggest the following steps be <br />taken: <br />• Redevelop the well by pumping and flushiny silt and sediment <br />from the casing to increase flow to well and allow <br />collection of representative ground water sample <br />u Pump well until field conductivity readings stabilize and <br />tflen sample <br />~ Bail well at sampling to evacuate two (2) casing volumes or <br />until conductivity stabilizes before sampling <br />a Take extra care not to contaminate sample with silt and <br />sediment from well bottom <br />• <br /> <br />