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MAXWELL MINE <br /> DRAINAGE AND SEDIMENT CONTROL PLAN <br /> SURFACE WATER AT THE MAXWELL MINE IS CONTROLLED BY A SYSTEM <br /> OF DIVERSION STRUCTURES AND SEDIMENTATION CONTROL DEVICES. <br /> THE SYSTEM IS DESIGNED WITH TWO SEPARATE OBJECTIVES. FIRST <br /> THE STORM RUNOFF FROM AREAS UNDISTURBED BY MINING IS <br /> DIVERTED TO KEEP IT OUT OF THE DISTURBED SURFACE AREAS <br /> BEFORE REPORTING TO THE PURGATORIE RIVER . THE SECOND SYSTEM <br /> CONTROLLS RUNOFF SILTING THROUGH SEDIMENTATION PONDS , <br /> THROUGH FILTERING OF LOW DISTURBANCE AREA RUNOFF, AND BY THE <br /> SURFACING OF SMALL AREAS WITH CLEANED GRAVEL TO PREVENT <br /> EXCESSIVE SILTING. <br /> ALL ENGINEERING WORK WAS DONE USING ACCEPTED PRACTICES <br /> WITH HYDROLOGY AND SEDIMENTOLOGY OF SURFACE MINED LANDS BY <br /> HAAN AND BARFIELD AS GUIDELINE . PUBLICATIONS AND A STUDY OF <br /> THE CIRUELA CANYON DRAINAGE BY THE SOIL CONSERVATION WERE <br /> ALSO USED IN THE ENGINEERING DESIGN OF THE SYSTEM. <br /> DRAINAGE OF AREAS UNDISTURBED BY MINING <br /> THE MAJOR DIVERSION AT THE SITE IS THAT OF THE CIRUELA <br /> CANYON ' S INTERMITTANT STREAM CHANNEL . THIS DIVERSION WAS <br /> NECESSARY TO PROVIDE AN AREA FOR THE MINE REFUSE WITHOUT <br /> z <br />