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ALTERNATIVE TO POND SETTLEMENT OF SILT. ALL WATERS TREATED <br /> BY ALTERNATIVE MEANS REPORT DIRECTLY TO THE CIRUELA CANYON <br /> DIVERSION CHANNEL AND INTO THE PURGATORIF RIVER. <br /> ENGINEERING DESIGN CALCULATIONS <br /> FOR ESTIMATING SURFACE RUNOFF THE SOIL CONSERVATION HAS <br /> IDENTIFIED THE TOPSOIL IN AND AROUND THE CIRUELA CANYON AREA <br /> AND THE MINE SITE AS "TABLE MOUNTAIN LOAM" . THE TABLE <br /> MOUNTAIN SERIES IN THIS AREA CONSISTS OF SANDY TO CLAY <br /> LOAMS . THEY ARE WELL DRAINED AND HAVE A MODERATELY LOW <br /> (0.25) EROSION FACTOR . THE MORE SANDY AND SILTY LOAMS ARE <br /> ON THE HILLSIDES ABOVE THE MAIN CHANNELS AND THE CLAY LOAMS <br /> TEND TO BE ON THE LOW STREAM TERRACES . THE DIVERTED <br /> DRAINAGES ARE FROM THE UPPER TERRACES AND HILLSIDES WHICH <br /> ARE GENERALLY OF A MORE SANDY NATURE AND OF A GREATER <br /> POROSITY . IN ESTIMATING RUNOFF COEFFICIENTS FOR THESE <br /> AREAS , A SANDY-CLAY TYPE OF LOAM WAS ASSUMED BFCAUSE OF THE <br /> SEVERAL SOIL VARIETIES INVOLVED. ALL AREAS WERE ASSUMED TO <br /> HAVE SOME CLAY-BEARING SOILS WHICH HAVE HIGH RUNOFF <br /> POTENTIALS . <br /> RUNOFF COEFFICIENTS FOR THE INDUSTRIAL AREAS WERE ESTIMATED <br /> TO HAVE A FAIRLY HIGH RUNOFF POTENTIAL . THESE AREAS ARE THE <br /> LOWER HORIZONS OF THE SANDY-CLAY LOAMS BUT BECAUSE OF LITTLE <br /> OR NO VEGITATION COVER AND RELATIVELY HIGH TRAFFIC LEVELS <br /> 8 <br />