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Data Assessment <br />confined aquifer from the San Juan and Sangre de Cristo ranges. In addition, the <br />hydrostratigraphy of the western edge of the valley is insufficiently defined with regard to its <br />potential for artificial recharge into the confined aquifer. A data collection program to help fill <br />these data gaps is discussed in Chapter 5.0. <br />The basic data required to fill the data gaps are expected to include new data in the form of a <br />series of observation and test wells drilled, logged, and tested. Though a number of locations in <br />the valley are without good subsurface geologic information, the western edge of the valley is of <br />particular importance, particularly in the fans of the Rio Grande and Saguache Creek. Also, a <br />detailed logging and testing program, coupled with newly-drilled test wells, is needed along the <br />Conejos River in the vicinity of the ground water discharge zone represented by McIntire Springs <br />and Sego Springs. Effort will be required to collect, evaluate, and potentially digitize existing <br />maps. <br />3.10 Ground Water and Well Test Data <br />These data include data from existing production wells and wells whose sole purpose is to <br />provide data on the ground water system. Some of the most important aquifer data collected from <br />wells include stratigraphy information collected during well drilling, static water levels, pumping <br />tests, and recovery tests. These data are then used to define the characteristics of the aquifer and <br />also to determine the parameters to used in modeling studies. <br />Data Assessment <br />Historically, there have been many studies that have collected and assembled ground water and <br />well test data in several specific areas of the valley. Selected source agencies that have compiled <br />or sponsored past efforts include: <br />• Colorado Water Conservation Board <br />• Colorado Water Resources & Development Authority <br />• Colorado Geological Survey <br />• USBR Closed Basin Division <br />• Adams State College Library <br />• Colorado School of Mines and Governmental Document Repository <br />Past efforts have included compilation and interpretation of data as well as production of contour <br />mapping of aquifer characteristics from data that existed at the time. Many studies are cited in the <br />references. Some of these studies have now become dated based on what is known at present and <br />need to be used with care. <br />Also, there are active well data collection programs on existing wells by the USGS cooperating <br />with other entities. The major ongoing studies are as follows: <br />The RGWCD takes monthly water level measurements in 70 unconfined aquifer <br />wells. A large percentage of these wells have records since 1975. The USGS provides <br />quality assurance and enters the data into the USGS database. <br />Each year the USGS and the RGWCD make measurements in 120 additional <br />unconfined aquifer wells. The USGS provides quality assurance and enters the data <br />into the USGS database. <br />a454/report/fmaUdata. doc 7/2&~OS 3 -13 <br />