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<br />\.).J14JF <br /> <br />24. <br /> <br />" <br /> <br />the Jurassic Entrada sandstone or the Triassic Wingate sandstone <br />flowed from less than 1 gpm to 20-30 gpm when drilled. As the num- <br />ber of wells and the withdrawal rate increased, the artesian pressure <br />declined (in some places about 100 feet). Although many of the wells <br />still flow, some have stopped flowing and most are now pumped <br />at rates of a few gallons per minute to a few tens of gallons per minute. <br />Most of the wells are in Orchard Mesa and the Redlands, which bor- <br />der the southwestern side of the Colorado River, but a few are north- <br />east of the river in and near Grand Junction. A few of the wells <br />in these areas are spaced far enough apart that their artesian <br />pressures have been little affected. A few wells scattered through- <br />out the area tap other aquifers and have not experienced appreciable <br />declines in artesian pressure. These include the Salt Wash member <br />of the Jurassic Morrison formation, the Cretaceous Dakota sandstone <br />and Burro Canyon formation; in most places, however, the latter two <br />formations yield salty water. Water from the extensively developed <br />aquifers generally is considered to be of excellent quality for domestic <br />use. <br /> <br />., <br /> <br />Trends in population and industrial growth and the potential <br />availability of water from other consolidated artesian aquifers suggest <br />few, if any, areas that may become extensively developed in the fore- <br />seeable future. However, local problems may occur any place were <br />two or more wells are closely spaced. Large withdrawals of water <br />from artesian aquifers generally have far-reaching effects on water <br />levels--the effects often extend several miles compared to several <br />hundred feet in unconsolidated aquifers. <br /> <br />., <br /> <br />" <br /> <br />- 8 - <br />