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This report presents hydrologic and water-quality data collected during an investigation of the Weldon Spring radioactive waste-disposal sites and surrounding area in St. Charles County, Missouri from 1984 to 1986. The data consists of water-quality analyses of samples collected from 45 groundwater and 28 surface-water sites. This includes analyses of water from 4 raffinate pits and from the Weldon Spring quarry. Also included in the report are the results of a seepage run on north-flowing tributaries to Dardenne Creek from Kraut Run to Crooked Creek. Mean daily discharges from March 1985 to April 1986 are presented for two springs located about 1.5 miles north of the chemical plant. Nitrate concentrations ranging from 53 to 990 milligrams per liter as nitrogen were found in 5 monitoring wells near the raffinate pits. In most cases, water from these wells also had elevated concentrations of calcium, magnesium, sodium, sulfate, lithium, strontium, and uranium. Uranium concentrations in ground water were less than 5 micrograms per liter except for 5 sites near the raffinate pits where concentrations ranged from 6.0 to 86 micrograms per liter and 13 sites near the quarry and north of Femme Osage slough where concentrations ranged from 8.9 to 14,000 micrograms per liter. Water from the 6 observation wells sampled south of the slough all had uranium concentrations less than 5 micrograms per liter. This report contains data collected for a hydrologic investigation of the We!don Spring radioactive waste sites and surrounding area from 1984 to 1986. During the first year of the investigation historical information was compiled about the chemical plant, raffinate pits, and the quarry as well as the geology and hydrology of the area. Reconnaisance water-quality and groundwater level data also were collected in 1984. This information and data are presented in an interpretive progress report (Kleeschulte and Emmett, 1986). In 1985 and 1986 additional detailed field data were collected to describe the groundwater flow system, hydrogeologic and water-quality characteristics of the aquifers underlying the area, surface-and groundwater relationships, and quality of surface water. STUDY AREA The study area is located in St. Charles County in eastern Missouri (fig. 1). Two distinct radioactive waste-disposal sites are in the Weldon Spring area. One site consists of the Weldon Spring chemical plant and the four raffinate pits that are located just north of the Mississippi-Missouri River drainage divide. The other site is an abandoned rock quarry (referred to as Weldon Spring quarry) in the bluff adjacent to the Missouri River flood plain and about 3 miles southwest of the chemical plant (fig. 1). Surface drainage at the chemical plant and raffinate pits is toward the north by intermittent tributaries. These tributaries flow into the August A. Busch Memorial Wildlife Area lakes 35, 36, or both, then into Schote Creek, then Dardenne Creek, and eventually into the Mississippi River (fig. 2).

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