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This report summarizes the availability of water-level data for the Capitan aquifer and evaluates the condition of wells in the Capitan aquifer observation-well network. The report summarizes water-level and water-quality data for the Capitan aquifer, including water-level data specifically for the Tansill Formation, collected from 1973 through 1995. The report summarizes aquifer-test and permeability data for the Capitan aquifer and shows the location of wells stored in the New Mexico State Engineer Office data base that tap the Capitan aquifer. INTRODUCTION The Capitan Reef complex extends in an arcuate band through southeastern New Mexico and southwestern Texas following the rim of the Delaware Basin (fig. 1). The Capitan Reef complex is composed of the Capitan and Goat Seep Limestones and most or all of the Carlsbad facies of the Artesia Group (Meissner, 1972), including the Grayburg, Queen, Seven Rivers, Yates, and Tansill Formations (Richey and others, 1985). The Capitan Reef complex functions as a single geohydrologic unit and is collectively called the Capitan aquifer (Hiss, 1973; 1976). The Capitan aquifer is the primary source of freshwater for the City of Carlsbad and several other communities in Eddy County, New Mexico, and is a source of irrigation water for southeastern New Mexico. The study area, which includes Eddy and Lea Counties, New Mexico, and the areal extent of the Capitan aquifer in Eddy and Lea Counties, are shown in figure 2. The New Mexico State Engineer Office (SEO) is responsible for management of water resources in the Capitan aquifer. Two problems that hinder water management in the Capitan aquifer are: (1) no comprehensive assessment of existing hydrogeologic data for the Capitan aquifer has been done since 1973 and (2) the hydrogeologic data that have been collected since 1973 have not been compiled. Therefore, the SEO recognized the need to compile, review, and update existing hydrogeologic data for the Capitan aquifer including hydrogeologic data that can be identified as representing conditions specifically in the Tansill Formation. The report was prepared in cooperation with the New Mexico State Engineer Office. Purpose and Scope This report shows the locations and summarizes the availability of water-level data for the Capitan aquifer and evaluates the condition of wells in the Capitan aquifer observation-well network. The report shows the locations of and tabulates or shows in graphical form water-level and water-quality data for the Capitan aquifer and Tansill Formation collected from 1973 through 1995. Graphs of water-level data for the Capitan aquifer observation-well network that were collected using automated data-collecting devices and stored in the OMNIANA data base include pre-1973 data for completeness. This report summarizes the results of aquifer tests and core sample permeability tests for the Capitan aquifer. This report shows the location and depth of wells in the SEO data base that tap the Capitan aquifer. CAPITAN REEF COMPLEX 0 50 100 MILES |____ i | I I I 0 50 100 KILOMETERS Figure 1 . Location of the Capitan Reef complex, New Mexico and Texas. 1O 4° 3O ' 1 0 3 " 3 0 ' 3 3 ' 0 0 '  ....]        1   I 21 S 22 S 23 S 24 S 25 S 26 S

u.s. geological survey open file report/open-file report

Summary of available hydrogeologic data collected between 1973 and 1995 and information on all permeability data and aquifer tests for the Capitan Aquifer, Eddy and Lea Counties, New Mexico