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The permit area is not prone to flooding from adjoining propert+es The predominate drainage course found m the vicinity of the site Is the Colorado River approximately 1000 feet south of the site A review of the Flood Rate Insurance Map indicates that part of the site rs prone to flooding by the Colorado River during a 100 year flood event Other than the establishment of the Constructed Wet Land Maigahon Bank, no other actwilles wdl occur with.n the idenGGed hood pram Mln~ng is conducted In a manner that will not increase the amount of surface storm water runoff above historic flows Any storm water runoff entering the sae will be captured wahm the Pa area and allowed to evaporate or percolate into the ground In order to ma~nta~n the quality of any surface storm water that uosses any exposed ground areas. a Storm Water Management Pian ISWMP) has been prepared. A key element of the plan calls for grading the area in a manner that will not allow the discharge of any silt laden storm water from the properly in the event of a storm. Test borings on the property have revealed that the seasonal high ground water table Is at an average elevation 4588 feet above sea level Therefore. tle•watenng wUl be regwred as part of the mmmg efforts Water will be pumped at various locations within the separate mmmg areas to existing drainage dashes atljo+mng the perms boundary These ddches will transport the water to the Colorado River De-watering assoaated with the gravel mining will be monaored to Insure water discharged will not have adverse impacts Mining and processing regwres the consumption of water Other than moisture in the sand and graver products removed Irom the site no water well be hauled away from the property Water usage estimates are presented in the following chart ^ USE GAL.IDAY AC FT'YR 25 ac Lake Evaporation Vanes 195 00 Cus Control .- 4.200 1 15 Process 25 ODO ~ 5 90 Agg-caste A1o~su.rr t`: A ^ 50 Teta! Annual bra~nr,i.~~~ i_;sn<x <'r,4 55 i - .y , ~_ w w. ~` `p.'~~~-.n~~~ rya. ~ r maintenance road.