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--;-~ -- ~~ ~ • • - , Page Two of Two March 13, 1980 The effect on the ground water table due to water losses from the gravel pits is unlikely to be measurable at distances of more than a few hun- dred feet from the margins of the pit. This conclusion is based upon the high aquifer transmissivity and unconfined water table conditions at the proposed quarry sites. '+ 3. The quarry pits~are unlikely to affect water flow in the Greeley No. 2 Canal (The New Cache La Poudre Irrigating Company) if quarrying is limited to distances of at least 200 feet from the ditch. 4. The gravel quarrying operation is subject to the same stringent Colorado State regulations on water use that would be applied, for example, to a proposed irrigation well at the same site. The Colorado State Engineer's office does review the data on consumptive use of water by gravel quarrying operations and ascertains if potentially detrimental effects on existing water rights could arise. It is possible that a quarrying operation could be required to replace or augument water to the stream system to compensate for their consumptive use of ground water. ~~T In summary, the potential for detrimental effects on irrigation rights, irrigation dit- ches, and water wells in the immediate vicinity of the proposed quarry operation appears to be nil. If the State Engineer's office finds that a significant amount of water is consumed due to the quarry operation, that office can impose appropriate water augmentation require- ments on the quarry operators in order to protect existing water rights. If there are any questions regarding this report, feel free to give me a call. Respectfully submitted, GEOLOGIC RESOURCES INVESTIGATIONS AND DEVELOPMENT ~ ~~ /~ ~~ James P. Waltz/, Ph.D. Hydrogeologist -; i