Daniel T. Chafin 1996 Water-quality data were collected from the Fountain Creek alluvial aquifer in 1988 and 1989 as part of the Toxic-Waste Ground-Water Contamination Program. These data indicate that dissolved solids, most major ions, fluoride, ammonium, boron, lithium, selenium, and strontium were more concentrated in the agricultural land-use area than in the upgradient urban land-use area. Nitrate and phosphate had significantly larger concentrations, and volatile organic compounds had significantly greater detection frequencies in the urban land-use area. application/pdf 10.3133/wsp2381D en U.S. Dept. of the Interior, U.S. Geological Survey ; U.S. G.P.O. ; For sale by USGS Map Distribution, Effects of land use on water quality of the Fountain Creek alluvial aquifer, east-central Colorado reports