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(~ <br />Pir, Ralph Tibble ; •• ', <br />Mr. Al 4linters <br />November 7, 1975 <br />Page 2 <br />If the mine drainage crater from the Bulldog hlowitain 11ine is treated at the <br />mine portal, upon termination of mining operation the ground water level <br />i-rill rise arithin the fractured zone and exit via other tw~nels or mine por- <br />e tals and springs. The treatment plant would then be of little value for a <br />long-term solution, IC is for this reason that a stream basin solution <br />tends to be of more significant importance than treating a single point <br />discharge. <br />Under separate cover, are have provided you with a preliminary report which <br />presents our detailed fin:lings and conclusions related to treatment, of the <br />Bulldog tiountain Hine drainage water, Please note that in this September 4, <br />1975 report, we havr. revised the rate of discharge of the Bulldog Mountain <br />I-tine drainage crater Lo reflect more defined estimates, based on hours of <br />pumping. <br /> <br />The State of Colorado has a number of streams draining basins which (rave <br />historically been centers of mining activity where heavy metal pollutants <br />continue to be carried into the river netarork. Overall solutions to these <br />problems h+rve not been developed. It is doped that this report will also <br />provide some direction Lo the understanding of Old mine pollution and poten- ^ <br />tial solutions to the problems. <br />Very truly yours, <br />. Y.RIJ:ekb <br />752-og <br /> <br />WRIGHT-h1cLAUGHLIN ENGINEERS <br />q ~. <br />Kenneth R. Wr-ig~ <br />.-.~c• ,.••.,• • ~i a <br />:~~.•••n~GrsiEryt!O f~% <br />:G <br />.. <br />~. <br />• ~ ~ <br />'~., ~08~r. ~~ <br />. T, .moo <br />iiv~.• `~O~.r. • ~ <br />''.FC`r Ci]L~R~ <br /> <br />i <br />i <br />i <br />- 158 - <br />