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~_ <br />- -= <br />--...=_ <br />~=- TUTTLE APPLEGATE RINDAHL, INC. <br />.- Consultants for Land and Resource Development <br />mr. John boerfer^ <br />Mi retl !and Reclamation Division <br />J+.ily 22, I98B <br />Page 3 <br />7her•e is little to no bed load ~~n a stream ~~f this size. <br />Using rough calculat i+~ns based on the size oP the dr•ainagrr <br />basin, an annual t~~Cal +,f c90 tons of sediment w~~+ald <br />probably be ge+ner•at ed. The statement made abo+at +nat+ar•a 7. <br />er^osion c~~nt inuing is not in conflict with the drainage <br />r•epert. When we ar•e talking abo+at an eph en+er•ai stream that; <br />has very little movement in sediment, mirn~r^ var•iati~~ns <br />caused by the mining are insignificant,. <br />qn aquifer will remain after mining is completed. rfie <br />nt i+'+i nq plan d+~es not remove ail of the material from L'hrtt <br />valley b+~ttonr. In looking at cr^+~ss sect i~~ns of the valley <br />Ploor• a signi Picant amount of sand will be left on 6otF+ <br />sides of the valley. In addition, b~~r•eholes sh~~w sand <br />deposits that ar•e as deep as ,'~0 Feet. We will not bc:~ <br />rem~~ving the n+ater•ial d+~wn to these tlepths. Groundwater <br />tends t~~ Plow dlol'rq the valley fiv.,r• in the same direct ip+•~+ <br />as s+a r•face Y'lows iri C~~aI Creek. This wo+ald intl icate that <br />there is still some storage capacity remaining within tht:~ <br />floodvlain for groundwater. <br />The Dawson aquifer o+.+tcr•ovs in Coal Creek upstream of tt+e <br />mine site and is ass+anred to c+~ntribute some flows to thECr <br />area. The dr•ai page basin above the provosed mine site i-+as <br />Pewee trees as y~~+1 proceed upstream and the trees changEr <br />Prom c~~ttonw~g~~ds tom} vines when yo+_+ r•eacn the Elbert County <br />line. '1-h is indicates that most of the gr•o+andwat er• gene+^at ec:f <br />iri this area probably c+~n+es from the Daws+~n. <br />1'he Iower•ing of the qr•+~+_t+ndwat er table in the mining area i+[:+ <br />not expected to have any imvact downstream or' the mining <br />site. The same volume pf water that currently Plows thr•~~+aqr+ <br />the mining site is exvectetl to c~~ntin+_~e after- n+ining is <br />completed. There will be rn~ dr•awdown at the bottom oP thE! <br />mining site and water will n~~t be p+~r+ded or L~therwise <br />impede[. <br />