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Figure 28. Ground Waler Bicarbonate <br />600 <br />500 <br />900 <br />.+ <br />~ 300 <br />E <br />200 <br />~ ~ <br />100+ ~ I - - I <br />a ; I I F- <br />Dec-97 Dec-98 Dec-99 Dec-00 <br />~-TR-1.5 -QTR-3 tTR-4 ~WR-1 <br />1000 <br />900 <br />800 <br />700 <br />600 <br />., <br />Q, 500 <br />aoo <br />300 <br />200 <br />100 <br />0 <br />~ ~ ~ ~ <br /> <br />Dec-90 Dec-91 Nov-92 Dec-93 Dec-94 Dec-95 Dec-96 Dec-97 Dec-98 Dec-99 Dec-00 <br />~-TR-1.5 -~TR-3 tTR-9 -0-WR-1 <br />3g <br />