caldwell county regional water and wastewater planning study

loose sand. The sand tends to be free of finer clays. The Carrizo outcrop is locatedin the southeastern part of the county. The cement-like characteristics of theCarrizo at the outcrop cause a rise in elevation. The stratum of the Carrizo dipsdownward from the outcrop at about 140 feet per mile with a general thickness ofabout 400 feet. The overlying sands have a higher hydraulic conductivity than theWilcox. In some parts of the county a clay liner acts as a seal to separate the twowater-bearing units.4.1.4 Recklaw FormationThe Recklaw Formation overlays the Carrizo and crops out at the southeast cornerof the county. It is about 2 to 3 miles wide and with a maximum thickness atapproximately 400 feet. It dips downward at about 140 feet every mile. Sand andsilt define the lower portion of the formation and clay with thin beds of sandstoneclassifies the upper portion.4.1.5 Queen City Sands OutcropThe Queen City Sands outcrop is approximately 3 to 4 miles in width. Theformation dips southeast at about 120 feet per mile. The thickness increases toapproximately 500 feet. The formation includes fine to medium sands and clay.The water in this formation was reported to have total dissolved solids that rangedfrom about 500 parts per million (ppm) near Bastrop and Fayette Counties to3,000 ppm near the Gonzales county line.4.2 Groundwater QualityThe water quality of the region varies depending on the aquifer and the depth atwhich it is found. The chemical constituents in ground water originate primarilyfrom the soil and rocks it seeps through. As depth increases so does the chemicalKlotz Associates Project No. 0972.000.000January 20104-5Caldwell County Regional Water and Wastewater Planning StudyFinal Report