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Park Center Well Hydrogeologic Assessment for Nontributary Designation Introduction This report is prepared pursuant to an application to change the designation of the Park Center Well from "tributary ground water" to "nontributary ground water". A designation of '"tributary ground water" is not consistent with hydrogeologic conditions at the well, and a change in designation is requested. Site Description Location of well: T. 17 S., R. 70 W., sec. 34, NE'/SW'/SW'/ (Garden Park area) Fremont County, Colorado Depth of well: 3,216 ft. Depth of aquifers: 2675-2738 ft. and 2778-2797 ft. (in basal unit of Fountain Fm.) The well is located about 4 miles north of Canon city, in an area known as Garden Park. Known as the Mutual Oil and Development Company well drilled during the period April 1923 to August 1927. The total depth of the well is 3,216 ft.; drilling was terminated in the Manitou Limestone. Drilled as an oil test, the well failed to discover economic reserves of oil or gas. Some limited oil shows were found in the Morrison Formation, but an oil or gas reservoir was never developed in this area. Later, the well was converted to a water well because of the copious amounts of good quality water obtained under artesian conditions. The well was flowing 12,000 barrels per day (350 gaUmin) when drilled. The well is currently being used for water supply for the Park Center Water District under leasing arrangements from the Bureau of Land Management. The water rights decree for this well is 2.67 cfs. C~eologX The well is located at the south end of Fourmile Creek Graben, an area of faulted precambrian rocks overlain by sedimentary beds of the Manitou Limestone, Harding Sandstone, Fremont Limestone, Williams Canyon Limestone, Fountain Formation, Ralston Creek Formation, Morrison Formation and Dakota Formation. These deformed sedimentary beds form the Chandler Syncline having its axis about 1'/< mile west of the well site. West of the axis of the Chandler Syncline, the beds are tilted at a much steeper angle, and dip towards the east. This structural feature provides the framework for confined ground water to exist, as indicated by many artesian flowing wells in the area, primarily to the south in the Canon City/Florence Basin. The Park Center well is situated in the extreme southern end of the Fourmile Creek graben adjacent to Fourmile Creek (figure 1). The surface formation upon which the well is located is the lower portion of the Morrison formation. Based on outcrop information (measured sections) and available well data, the subsurface stratigraphy at this site includes sedimentary strata from the Manitou Limestone (Lower Ordovician age) up to and including the basal section of the Morrison Formation (Upper Jurassic age). The subsurface stratigraphic sequence at the well is substantiated by the geologic log prepared for the Mutual Oil and Development Co. #1 well (Park Center well)