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I I I I I I I I I I I I I I I I I I I 4.0 WELL DATA BASE ANALYSIS 4.1 WELL RECORDS The 1967 Beck Report states there were approximately 1,020 active wells registered with the State Engineers Office (SEO) by 1966. The records of the SEO were reviewed and updated from the August 1999 list used in the 1999 Feasibility Study by MWE, with the assistance of staff from the SEO. Based upon the updated records, there are approximately 2,600 registered and permitted wells in the Basin as of May 2000. These wells are shown on Map 1 and are separated into respective well types. Of this total, approximately 1,300 wells are considered high-capacity wells (Le., they are permitted to produce water at rates greater than 50 gpm). The remaining 1,300 wells are considered small capacity wells because they are permitted to produce less than 50 gpm. Table 4-1 provides a summary of the 2,600 wells based on permitted use and their classification either as a large or small capacity well. Appendix A contains a list of permitted wells in the Basin that was obtained from the SEO. 4.2 WELL LOGS To achieve the stated goals No.2, 3, and 6 in Section 2.0, selected logs of permitted wells were carefully reviewed and analyzed by MWE staff geologist. A series of geologic cross sections with composite ground-water levels were created and are depicted in Map 2. The cross sections are presented and described in Section 9. Using the cross- section information, major hydrostratigraphic units and aquifers in the Basin were identified and are described in Sections 7 and 8, respectively. The cross sections were also instrumental in creating aquifer structure-contour and saturated thickness maps (Maps 9 and 10). 4.3 MONITOR WELL LOCATION AND SELECTION Crop irrigation is significant in most of the townships of the District. However, ground- water levels are not monitored in many of these high-irrigation townships. Map 2 also shows the location of 83 high-capacity wells that are monitored annually (in January through March) to measure and record water-level information within the District. These wells are listed in Table 4-2 with associated location, aquifer and water-level information. These wells are located. on Map 3 along with other wells used to define the various hydrostratigraphic units and aquifers. Table 4-3 lists the number of monitor wels, irrigation wells, and total number of wells for each township in the District. This table also identifies those townships where additional monitoring wells would be useful. Map 4 provides a visual assessment of the same data. IV-1