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4.0 HYDROLOGIC NETWORKS -- Continued <br />4.2 Ground -Water Networks <br />The Data Base Includes 377 Sites <br />Observation -well networks monitored by the U.S. Geological Survey and private <br />companies and inventories of wells, springs, and mines by the U.S. Geological <br />Survey provide data for describing ground -water conditions in the area. <br />The U.S. Geological Survey annually measures <br />and records water levels in 13 observation wells in <br />Huerfano and Las Animas Counties, Colo. Samples <br />of water for chemical analyses have been collected <br />from 10 of these wells. Seven additional wells, five <br />of which were sampled, were formerly monitored for <br />varying periods. In addition, many wells, springs, <br />and mines were inventoried and sampled in Colorado <br />(mostly north of the Purgatoire River) and in New <br />Mexico (mostly east and south of the Park Plateau). <br />Some of this information is published in Griggs <br />(1948, p. 84 -176), Powell (1952, p. 29 -30), McLaugh- <br />lin and others (1961), Dinwiddie (1964, p. 6 -15), and <br />Hart and Smith (1979), but much of it is unpublished <br />U.S. Geological Survey data. <br />CF &I Steel Corp. monitors water levels in nine <br />observation wells at its Allen and Maxwell Mines <br />near Weston, Colo. (Water, Waste, and Land, Ltd., <br />1980, and unpublished data). Samples of water for <br />chemical analyses were collected from six of these <br />wells. CF &I also monitors the volume and quality of <br />mine discharge at the two sites. <br />Kaiser Steel Corp. monitors water levels and <br />quality in 16 observation wells, as well as the volume <br />and quality of mine discharge, at its York Canyon <br />Mine, west of Raton, N. Mex. (Dames and Moore, <br />1978, and unpublished data). <br />A data base of 377 sites was selected for this <br />report on the basis of the spatial distribution of the <br />sites and the quantity and quality of data available at <br />each site. The data base includes wells and springs <br />discharging from single bedrock and alluvial aqui- <br />fers, multiple .bedrock aquifers, and discharge from <br />mines and tailings. Two hundred and five of these <br />sites have water - quality analyses available. The data <br />base is shown in figure 4.2 -1. Representative <br />ground -water data are included in the Supplemental <br />Data" section and data -site numbers in this report <br />correspond to this tabulation. <br />Figure 4.2 -2 A well in Burro Canyon near Segundo, Colorado. <br />36 <br />