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10 <br />20 <br />30 <br />40 <br />50 <br />60 <br />70 <br />80 <br />90 <br />100 <br />110 <br />120 <br />130 <br />051015202702802905657585905101520 <br />CASING AND BOREHOLE SPECIFIC CONDUCTANCE, TEMPERATURE, IN FLOWMETER, FREE-FLOWING <br />DIAMETER, IN INCHES IN MICROSIEMENS DEGREES FAHRENHEIT TROLLING, VELOCITY, <br />PER CENTIMETER IN FEET PER MINUTE <br />THROUGH THE ELECTRO- <br />MAGNETIC FLOWMETER <br />Figure 9. Geophysical well logs for well ALA.9. <br />The specific-conductance, temperature, and <br />and above 1,200 ft that may have been created during <br />free-flowing trolling flowmeter logs indicate two <br />free-flowing conditions, or it may occur due to natural <br />inflow zones at depths of 810 to 830 ft, and 860 to <br />head differences that exist among the different flow <br />908 ft. The reduction in flow detected by the free- <br />zones of the confined-aquifer system. <br />flowing trolling flowmeter at a depth of 862 ft may be <br />The water level measured in well ALA.10 repre- <br />due to water flowing out of the casing, flowing in the <br />sents a composite head because the well is open to <br />annular space, and then reentering the casing above <br />several permeable zones over an interval of about <br />862 ft. Apparent inflow in three depth intervals (120 to <br />1,100 ft. <br />200 ft, 360 to 390 ft, and 650 to 735 ft) is probably due <br />to small changes in the casing diameter as observed in <br />Well ALA.12 <br />those intervals on the caliper log. <br /> Well ALA.12 is a flowing well that has <br />The shut-in trolling flowmeter log contains <br />6.4-inch-diameter casing from land surface to a depth <br />some spikes that do not represent valid flow measure- <br />of 899 ft. The casing has torch-cut slots from a depth <br />ments near depths of 270 ft, 730 ft, and 740 ft. Under <br />of 797 to 899 ft (fig. 11). The well is uncased from a <br />shut-in conditions, inflow occurs in two zones at <br />depth from 899 to 908 ft. A lithologic log was not <br />depths from 720 to 790 ft and 885 to 908 ft. The <br />available for this well. <br />ANALYSIS OF GEOPHYSICAL LOGS <br />17 <br />