TOTAL DISSOLVED SOLIDS CONCENTRATIONS OF GROUNDWATER FROM THE PENNSYLVANIAN CHEROKEE GROUP, MARMATON-PLEASANTON GROUPS AND KANSAS CITY-LANSING-DOUGLAS-SHAWNEE-WABAUNSEE GROUPS IN MISSOURI

The total dissolved solids (TDS) concentration of groundwater in three Pennsylvanian aquifer groups (Cherokee, Marmaton-Pleasanton, and Kansas City-Lansing-Douglas-Shawnee-Wabaunsee groups) was derived from a variety of sources including Missouri Department of Natural Resources' Division of Geology and Land Survey's (DGLS) written data files, U.S. Geological Survey's (USGS) National Water Information System (NWIS) electronic data files, U.S. Environmental Protection Agency's (EPA) STORET electronic data files, Department of Natural Resources' Division of Environmental Quality Public Drinking Water Program Internet resource pages, and various historic published reports.

Wells were selected for analysis from 53 counties where water quality test results exceed or are near 1,000 milligrams per liter (mg/L) of TDS. Generally, the groundwater data available for Missouri counties adjacent to or northwest of a 1,000 mg/L TDS freshwater-saline water transition zone is included. Well construction, location and aquifer data for most sites were identified in DGLS geologic logs, driller logs, the Oil and Gas Permit database or written on the analysis data forms.

The TDS concentration is depicted on this poster by equal concentration contours. EPA defines underground sources of drinking water (USDW) as those aquifers whose TDS is less than 10,000 mg/L. These maps depict TDS at a regional scale. Therefore, they should not be used to determine if these aquifers are USDWs. Water quality data used to generate contours are shown as control points. Data used to generate contours from outside the state are not shown on the poster

ESRI^® ArcMap^TM 9.3 and its extensions, Arcview^® Spatial Analyst and 3-D Analyst, were used to prepare the raster images for this poster. Funding for this project was obtained from a U.S. Department of Energy grant through the Energy and Environmental Research Center in Grand Forks, ND; an EPA Underground Injection Control Program grant; and state general revenue funds through DGLS.