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<br />~II II~'IIIII II~~ II~ <br />sss <br />TR9PPER ~ININC INC. <br />CERTIFIED P297324767 <br />Mr. Gregg Squire <br />Reclamation Specialist <br />Colorado Mined Land Reclamation Division <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, CO 80203 <br />January 29, 1987 ~~•~-,:-~ _ . <br />F~ ~ 2 1987 <br />~ hllR'r 1 j lyd p <br />~~~ [31VtJivj~j <br />Dear Gregg: <br />Enclosed is Trapper Mine's 1986 Annual Groundwater Monitoring report, as per <br />section 4.8.5.2 of our OSM permit application, <br />Hydro-Engineering Inc. (Casper, Wyoming) hae collated our field and laboratory <br />data; and has reported it in the same format as last year. <br />We are addressing the changes requested by your Letter (5/8/86) and by Ms. <br />Thompson on 4/18/86. We are including: <br />1) Copies of our 1987 pit advancement disturbance which amend those submitted <br />last year. <br />2) Copies of the NOAA monthly summaries fur the 1986 climatological data. <br />3) The 1986 pit dewatering data for Trapper Mine. <br />We are submitting graphs of TDS over time instead of EC values. George <br />Hoffman, Hydro-Engineering, feels this is the best salinity indicator we have <br />for trend analysis, to date. Historical EC data seemingly did not relate. <br />There was too much scatter. To interpret a trend may have been very <br />misleading. <br />George feels that the salinity trend is better understood iE plotted by TDS <br />this year. <br />By next year, we shall have three (3) years of data to correlate TDS and EC <br />values. We have been striving to develop consistency of technique fur EC <br />sampling so that data anumolies can be reduced and so that EC can be used to <br />interpret trends. <br />If there are any questions, please call. me. <br />Best regards, <br />~~[it-Li <br />H. Bruce Humphries <br />Sr. Environmental Enginerer <br />t <br />WSH/ jb <br />Enclosure <br />pc W, S. Harding, Jr. <br />Ftle 109.2.3.1 <br />~1~ P.O. Box 187 <br />I Y ... ~ f <br />Craig, Colorado 81626 <br />i~ ~-I. ?Yw~i' <br />X3031 824-4401 <br />. h' <br />