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2.3 PREVIOUS INVESTIGATIONS <br />The U. S. Geological Survey (USGS) initially investigated the geology and ground -water <br />resources of Baca County in 1954 (McLaughlin). This study was followed in 1967 by the <br />above -referenced ground -water resources investigation by Beck and Associates. The <br />Colorado Division of Water Resources monitored ground -water levels in the Basin <br />beginning in 1987 and has published annual monitoring data (Roberts and others, 1990 <br />to 2001). The USGS published a report in 1999 documenting the water -level changes <br />from 1980 to 1997 and saturated thickness from 1996 to 1997 in the High Plains aquifer <br />(McGuire and Fischer). The Kansas Geological Survey conducted a number of ground- <br />water use and water -level studies in southwest Kansas pertaining to the Dakota aquifer <br />(Macfarlane, et al., 1993, 1995, and 1999). Each of these studies was reviewed and <br />relied upon for the Phase 2 investigation and report. <br />2.4 METHODS OF INVESTIGATION <br />In addition to a review of the published reports described above, MWE obtained <br />approximately 1,500 additional well logs and construction records kept in the official files <br />at the State Engineer's Office and numerous reports published by the USGS, which <br />were further evaluated. These records and reports were used to further define the <br />hydrogeologic character of the aquifer system in the District, both aerially and vertically. <br />These data were used to update geologic cross-sections and maps that are presented <br />and described in this report. <br />11-6 <br />99-028.003\Phase 2 Report\ SHP Introduction <br />