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<br />TH75~A (+2.5') and Mahogany well IRI-11 (0') changed insignificantly. B-Groove well IRI- <br />10 (+14.9') changed significantly with increasing WL, and returned to similar level from <br />1994 -1995. <br />Perched aquifer, regional wells IRI-PW-2 (+0.3') and IRI-3 (+0.3') indicated a slight <br />increase in WL and similar to project wells, no significant trend was established. <br />6.1.6 Waste and Process Ponds <br />The pond leakage has been pumped back to the ponds and monitored since late 1991. <br />The ponds at the WRN site have a secondary liner which collects and directs the leakage <br />• to the leak detection tube for removal. Weekly collection and removal of leachate <br />continued in 1998. Monitoring of pond leakage in the past indicated an increase when <br />there are cold nights and warm days. This may be when maximum constriction and <br />expansion of liner increases leakage. Table 6-17 summarizes leachate removal from lined <br />ponds, and pond levels for 1997-1998. <br />In summary, no significant change from historical data was noted in pond leachate rates in <br />1998, although the pond levels remained high. <br /> <br />82 <br />