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<br />I <br />. <br />. <br />. <br />'. <br />. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />:1 <br /> <br />maximum allowable of 2.4 ~q/liter. The water is usually <br />high in dissolved salts and sodium content. The fluorides, <br />total solids, and sodium are often in excess of the <br />maximum allowable or recommended limits established by the <br />Colorado Department of Health. Because the fluoride content in <br />the water is usually only slightly above the maximum allowable, <br />the water quality for this water may be considered reasonably good as <br />compared to other sources of water in the area; particularly when <br />considering the shallow wells or surface supplies available. <br /> <br />The primary consideration for excessive fluorides in potable water <br />is that the fluorides produce objectionable staining and mottling of <br />tooth enamel. Treatment methods for removing or reducing fluorides <br />in water are limited and not adaptable to common or past conven- <br />tional treatment methods for public water supplies. Blending of <br />water containing high fluorides with a water supply containing lesser <br />amounts of fluorides is one method for meeting the health standards. <br />Fluorides may be removed by an alumina filter media and regeneration <br />using chemicals. This process can be done by using standard ion <br />exchange equipment. Treatment processes for removal of fluorides <br />have been found to be quite expensive as compared to conventional <br />treatment costs and therefore are normally prohibitive and not <br />practical for consideration. <br /> <br />In considering the problem of total dissolved solids, the high <br />dissolved salts and sodium content existing in the water can cause <br />taste problems and can have laxative effects on the user. The <br />sodium can create problems with sodium-sensitive plants and fine <br />textured soils. Water treatment processes typically used in the <br />past are not applicable for removal of these dissolved solids and <br />other treatment processes are not economically feasible at this <br />time when compared with other alternatives considered. A blending <br />with a supplemental water source containing less sodium and less <br />total dissolved solids could improve the water quality and reduce <br />the solids to within the recommended limits. <br /> <br />The Laramie-Fox Hills aquifer is a dense aquifer and releases its <br />water slowly. This limits the practical capacity of the wells used <br /> <br />v - 7 <br />