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I i i i r i 1 1 1 I I 1 i, i r i r I Pollution of Water Systems During mining potential sources of pollution are turbidity in gravel mine water, spillage of irrigation water, and histori- cal surface water that might enter the gravel pit. Fowever, due to the small size of the operation and since mining will be accomplished using the wet pit method, the mining operation will cause no measurable adverse effects on the existing water quali- ty on or in the vicinity of the mining operation. San-o-lets will be utilized for employees on the property during mining. After mining septic tanks approved by the Tri-County District Health Department will be utilized for individual on-lot sew- age disposal. Water Use During Mining Water for employees on site will be supplied by bottled water. During mining water will be utilized for operating the crush- er and for dust suppression. A maximum of 1000 gallons per day, 6 days a week will be needed for this purpose. Thus the yearly operating requirements for this purpose is less than 1 acre foot per year. In addition, water will be needed to estab- lish revegetation around the lake. Both of these uses will have negligible effect on nearby wells as they are considerab]y~less than present irrigation water use. The applicant has 10 shares of Fulton Ditch water, anc? up to 100 acre feet per year of water from an existing well that can be utilitzed for these purposes. For the well water it will be necessary to change the point of diversion to the created lake and the use. Application will be made to water court for this change in use and point of diviersion. Evaporation from the created lake is expected to average 30 inches per year. The amount. of evaporation presently that occurs for irrigation is approximately 15 inches, or 53.4 acre feet per year. The net effect of this amount of evaporation on surround- ing wells from substituting the lake for land is expected to be negligible. Regardless, at present state law does not require replacement water for evaporative losses even if they are deter- mined to exist. However, since the applicant is aware that there is a possibility this may be required in the future by legisla- tion, provisions have been made to replace any evaporative losses if they are determined to exist and required by state law.