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F I E L D CO N D U C T I V I T Y <br />GPS <br />• <br /> <br />2600ti <br />t <br />s <br />s <br />s <br />2400tt <br />s <br />t <br />s <br />f <br />2200ss <br />F i <br />I t <br />E i <br />L t <br />D 2000si <br />s <br />c s <br />D i <br />N i <br />D 1800si i <br />U s i <br />C s s s <br />T is s# s i t s s t s <br />I i s i s <br />V 1600ti i <br />I s s s <br />T i <br />Y i s <br />i <br />1400si <br />i <br />s <br />• <br />s <br />1200is <br />i <br />i <br />i <br />s <br />le0ess <br />ssssssssssttssssssssssssiss#sssstssstsississisisssttsssZttsss <br />JJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJJASONDJFMAMJ <br />i 1986 i 1987 s 1968 i 1989 s 1990 11991 <br />D A T E <br />• <br />FIGURE B-26 FIELD CONDUCTIVITY, VERSUS TIME FOR GPS. <br />B-Z6 <br />