Laserfiche WebLink
<br />uses. Well yields for commercial uses are generally less than <br />I 50 gpm. Well depths are as great as 40 feet, however, most of <br />the wells do not penetrate the entire thickness of the sands and <br />gravel deposits. <br />t The sand and gravel deposits are underlain by several <br />hundred feet of the Fox Hills Sandstone, a medium-coarse grained <br />sandstone that is moderately consolidated. The Fox Hills Sandstone <br />1 is considered an aquifer throughout the area. However, no wells <br />are completed in the sandstone because of the large amounts of <br />ground water stored in the sand and gravel deposits. Ground water <br />in the sandstone is hydraulically connected to ground water in <br />the sands and gravels, and ground water discharge from the sand- <br />stone is hydraulically connected to ground water in the sands and <br />gravels, and ground water discharge from the sandstone supports <br />water levels in the sand and gravel deposits. <br />Water Quality <br />' Water quality data of ground water in the sands and gravels is <br />described in the U. S. Geological Survey Basic Data Report <br />i No. 9, 1962. Three water samples were collected by the Survey <br />from wells immediately adjacent to the mining property. The <br />water is principally a sodium bicarbonate type and dissolved <br />solids concentrations range from 580 to 1300 mg/1. The pH of <br />the water ranges from 7.4 to 8.4 (N.P.D.E.S. #CO-0001694) <br />Analyses of water samples collected by the survey from the <br />Cache la Poudre River at a gage site near Greeley reveal that <br />C-4 <br />