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SE~-05-2003 FRI 09;27 AM BAt•~AND GESSO LLC FAX N0, 3t~74 8329 P, 05 <br />• Page 4 <br />September 4, 2003 <br />It should be noted that there are ocher outside impacts (not assoGated with the Haldoreon <br />protect) that may have a signifignt effect on downstream water rights, springs, ponds and <br />drainages. These may develop or change over time and inGUde: <br />o elimination of irrigable land In the surrounding area <br />o repair of leaky ditches upstream of the site <br />o climatic changes <br />o changes in irrigation practices <br />7. Remedial action <br />In the event downstream water rights are damaged remedial action can betaken to address this <br />problem. The scope of the action would depend on the scope of the problem. In general, however, <br />Uncompahgre Valley Water Users' Association (project) water will be used to augment or replace any <br />diminished flows attributable to the mining project. 658 AF per year of water is available for this <br />purpose. F~Itration galleries orlnjection wells can be used to recharge the groundwater system at <br />specific locations. Because of the conductive and relatively uniform nature of the gravels these <br />methods should work quite well. <br />8. Need for a comprehensive hydrologic study <br />From a hydrologic standpoint the system in and around the project area is uniform and well defined. <br />The various components have been presented and discussed in this letter. Anecdotal evidence, <br />measured data, and observations confirm the nature of the hydrologic system as described in th(s <br />letter. Only a few of the factors that contribute to the hydrologic balance are affected by the proposed <br />plan and no signficant impacts, attributable to the development of a gravel pit, have been identified. <br />Because of this I see no advantage in performing a comprehensive hydrologic study at this time. <br />Sincerely, <br />~~~~ <br />Don R. May, PE, Ph.D. <br />Consulting Engineer <br />735 East 7°i Avenue <br />Durango, Co 81301 <br />970-3857504 <br />