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The Minnesota Management Systems Evaluation Area project is part of a multi-scale, inter-agency initiative to evaluate the effects of agricultural management systems on water quality in the midwest corn belt. The research area is located in the Anoka Sand Plain about 5 kilometers southwest of Princeton, Minnesota. The ground-water-quality monitoring network within and immediately surrounding the research area consists of 29 observation wells and 22 multiport wells. Thirteen observation wells are also located outside the research area. The primary objectives of research by the U.S. Geological Survey at the Princeton Management Systems Evaluation Area are to: (1) determine the relation of the spatial and temporal distribution of agricultural chemicals in ground water to recharge, topography, and subsurface heterogeneities; and (2) determine the effects of the modified and prevailing farming systems on ground-water quality. This report presents geologic logs and water-quality data used to characterize the Princeton Management Systems Evaluation Area. Introduction The Management Systems Evaluation Area (MSEA) program is part of a multi-scale, inter-agency initiative to evaluate the effects of agricultural systems on water quality in the midwest corn belt. Five primary MSEAs (fig. 1) were selected to represent a variety of hydrogeologic settings and the geographic diversity of prevailing farming practices in the region. The Minnesota MSEA has a primary research area near Princeton, Minnesota in the Anoka Sand Plain, an area of glacial outwash covering about 4,400 km2, and satellite areas located near Oakes, North Dakota; Brookings, South Dakota; and Arena, Wisconsin (fig. 2) (Delin and others, 1992; Anderson and others, 1991). Each of these locations are in sand-plain areas considered typical of the northern corn-belt region. The interagency research objective of the Minnesota MSEA is to evaluate the effects of a modified farming system on ground-water quality in sand-plain areas with slightly different climatic conditions. The modified farming system uses irrigated ridge-tillage in a corn/soybean rotation. Nitrogen fertilizer and the herbicides atrazine, alachlor, and metribuzin are applied. Although the modified farming system is evaluated at satellite areas in North Dakota, South Dakota, and Wisconsin (fig. 2), research was concentrated at the area near Princeton, Minnesota. The remainder of this report discusses information pertinent only to the Princeton MSEA. Research at the Princeton MSEA is being conducted primarily by the Minnesota District of the U.S. Geological Survey (USGS) in cooperation with the University of Minnesota Department of Soil Science, and the U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS). Other agencies conducting research at the Princeton MSEA include the USGS Geologic Division, Minnesota Pollution Control Agency (MPCA), the USDA Soil Conservation Service, the University of Minnesota Department of Agricultural Engineering, the University of Minnesota Department of Geology and Geophysics, and the U.S. Environmental Protection Agency. The MPCA assisted with financial support, project planning, collection of water samples, and the interpretation of water-quality data. The primary objectives of research by the USGS at the Princeton MSEA are to: (1) determine the relation of the spatial and temporal distribution of agricultural chemicals in ground water to recharge, topography, and subsurface heterogeneities; and (2) determine the effects of the modified and prevailing farming systems on ground-water quality. This report presents geologic logs and water-quality data used to characterize the Princeton MSEA. Location and Description of Study Area The 8.3 km2 study area is located about 5 km southwest of Princeton, Minnesota and about 80 km northwest of Minneapolis and St. Paul (fig. 2). The 65ha research area is located about in the middle of the study area (fig. 3) and adjacent to a wetland (fig. 4). Topography is undulating in the research area with a maximum change in elevation of about 3 m over a horizontal distance of about 40 m. The area is drained primarily by Battle Brook, a tributary of the St. Francis River that flows into the Mississippi River. Five cropped areas (fig. 3) were established in 1991 to evaluate the effects of selected farming systems on ground-water quality. The 1.8to 2.7-ha cropped areas were oriented parallel to the predominant ground-water flow direction based on water-level data collected during October 1990 through March 1991. This orientation was preferred to minimize the mixing of leachates reaching the water table from the different farming systems being evaluated. Base from US Geological Survey digital data, 1:250,000, 1989 Universal Transverse Mercator Projection, Zone 15 EXPLANATION Primary MSEA Minnesota satellite area Figure 1.-Location of Management Systems Evaluation Areas (MSEAs) in the midwest. The ground-water monitoring network within and immediately surrounding the research area consists of 29 observation wells and 22 multiport wells (MPORTs) (fig. 4). Thirteen observation wells are also located near the research area (fig. 3). The observation wells within the research area are constructed of 5.1-cm insidediameter (i.d.) galvanized-steel or polyvinyl-chloride (PVC) casing with 15or 60-cm long stainless-steel screens. The observation wells located outside the research area are constructed of 5.1-cm i.d. galvanizedsteel casing with 60or 150-cm long stainless-steel screens. All but four of the observation wells are screened in the upper meter of the saturated zone, with the remaining four wells installed 7 to 14m below the water table. The observation wells were installed through the annulus of 10.2-cm i.d. hollow-stem augers. The augers were then removed and the natural formation below the water table was allowed to collapse around the casing. Above the water table, a mixture of bentonite and native material was used to backfill the annulus to prevent the vertical movement of water and agricultural chemicals down the borehole. Each MPORT consists of six 0.6-cm i.d. stainlesssteel tubes housed in a 5.1-cm i.d. PVC casing; each tube has a 3-cm long screened interval (port) which is external to the PVC casing. The sampling ports were installed at 50-cm intervals with the uppermost port 50 cm above the water table at the time of installation, to

Hydrogeologic and water-quality data used to characterize the Management Systems Evaluation Area near Princeton, Minnesota, 1991