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2.04.7 (21 SURFACE WATER INFORMATION <br />• <br /> Prior to mine site construction, the watershed diversion along <br /> the old road will be upgraded to safely pass the runoff from the <br />100-year 24-hour storm event and a sediment pond will be <br />constructed to collect all runoff from the entire disturbed area <br />except for parts of the mine haul road. The name of the <br />watershed which will receive the drainage from the permit area is <br />Raton Creek which flows into the Purgatoire River. Map No. 12 <br />shows the plan of mine site water systems to protect the quality <br />of water downstream which flows into Raton Creek. The detailed <br />design of the sediment pond, watershed diversion and collection <br />ditches is presented in 2.05.3 (4) PONDS. IMPOUNDMENTS AND <br />DIVERSIONS. <br />• The Starkville Gulch drains an area of approximately 268 acres at <br />the point it leaves the mine site area. This drainage is an <br />intermittent stream which flows only during rainfall or spring <br />snow melt. The peak and maximum flow far a 100-year 24-hour <br />storm event was determined to be 503 cfs. The average flow, to <br />the extent determinable for an intermittent stream, was <br />determined to be .0004 cfs. <br />Map No. 11 shows the location and extent of old spoil piles in <br />the area of the mine site. This spoil material came from the old <br />Starkville mines which were operated from the SB80's to the <br />1940's. From the age of the material and from visual inspection, <br />it is apparent that the spoil is extremely weathered and leached, <br />• and is probably causing little effect on the water quality <br />158 <br />