Geologic And Hydrologic Factors Governing ... - Gunnison County

Geologic And Hydrologic Factors Governing Impacts Of Development
On The Crystal River Near Marble, Colorado
Gunnison County, Colorado
the maps because the permit locations are not adequate to identify location to the 0.3-acre lot level of
accuracy. The depth of wells ranges from 10 to 305 feet. Data for the wells is presented in Figure 4.
Appendix B provides official data from the SEO on the permitted wells in the study area.
Statistically, the opportunity for developing successful domestic and commercial wells beyond the
aquifers most closely associated with the Crystal River and lower Carbonate Creek is marginal. In
the marginal zones, 60 percent of the wells attempted have, in fact, been dry. Of the dry hole first
attempts, 90 percent of the second attempts have also been dry with 10 percent of the second at-
tempts yielding slightly more water. Approximately 20 percent of the drilling customers request a
third test hole.
Collins Drilling Company was interviewed in regard to well drilling history in the area. In general,
the Marble area wells are good producers adjacent to the Crystal River and poor producers on the
mountain. The influence of Mancos Shale formations severely limits the success of wells. Wells
along Slate Creek have been marginal (