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ea•'-ward and northward acros~• the property in a rectangular pattern (Plates I, II, and III). The general u 3inage is in a northeasterly direction. 'his portion of the site is separated from normal flows of the South Platte River by a dike which extends across the southerly boundary and along the west bank of the South Platte River. The irrigation laterals collect at a culvert t•~hich flows under Henderson Road at a location approximately 900 feet west of the bridge over the South Platte River. The culvert drains int., a low area located north of Henderson Read which drains north- easterly into the channel for Brantner Gulch. North of Henderson Road, Brantner Gulch is conveyed in a con ete lined channel which flc,w:: un~l,•r thr road to the fairgrounds. Brantner Gulch flows along the so~:l~ end east sides of a levee and joins the South Platte River at a location further north. Tlie ground is relatively flat an,: drains in a northeasterly direction. This por~.on of the site is separated from normal flows of tlic South Platte River by a levee which extends along the river's west bank. DRAINAGr DURING MINING AND RECLAMATION Ti,e site will be mined in six s~agea over a 1; .0 1• year r,;riod. Afwr reclamation, two ia,.es will remain on the mining site (Figure C). Excavation of the area south of Hend•~rson gad will be accomplished in five stages; the area north of the road will be mined in one stage. Reclamation will begin as soon as practic,.rl after complexion of each stage and c. '1 involve sculpturing of lake shores ana planting of vegetation. Tributary Areas Tributary areas including Brantner Gulch and the local area east of it, and the South Platte River ,'ill remain un- changed by the mining and reclamation operctions. Flood Plain Excavation of the area south of ,icndcrson Road will affect both the flood plain and floodway limits. Modification of these limits will be negligible a<::::~•; the early stages but become more pronoun^^d as e>:cav.,tron proceeds. Henderson Road will continue to c,~.,trol the flood plai^ '~v:~tior immediately upstream. As excavation proceeds, the lake will control more and more of the everbank flood profile which will become relatively flat. 7'he flood plain acrd floodway limits will, begin to generally follow tii~ western bank of the lake. At the southern end of tl~c 1:. the flood plain and floodway limits will merge ~:ith their existing limits. It is recommended that the top of the laF:c:'s suu~:: enbankment he maintained 200 to 400 feet or c::~r.~ torch of the sor~~herly property line. This will help c•^~.- •} rn additional -28-