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III III1111111111III <br />999 <br />• 6.1.6 Waste and Process Ponds <br />u <br />The pond leakage has been pumped back to the ponds and monitored since late 1991. The <br />ponds at the WRN site have a secondary liner, which collects and directs the leakage to the <br />leak detection tube for removal. Weekly collection and removal of leachate continued in 2000. <br />No significant change from historical data was noted in leachate rates in 2000. The waste pond <br />had slightly less leakage for the year 2000. The pond level continued to decrease for the waste <br />pond but the process pond WL was high throughout 2000. Monitoring of pond leakage in the <br />past indicated an increase when there are cold nights and warm days. This may be when <br />maximum constriction and expansion of liner increases leakage. Increased quantities of solids <br />in the process pond were noted in 2000 and removal action is planned for 2001. Table 6-18 <br />summarizes leachate removal from lined ponds and pond levels for 1999 - 2000. <br />6.2 Biology Monitoring <br />6.2.1 Tertestrial Vegetation <br />Pursuant to BLM and Colorado DMG requirements, vegetative production, and percent crown <br />cover were sampled in 1991 through 2000 for native undisturbed areas. <br />Circular Random Plots: The total 2000 grass and forb production is shown on Table 6-19 <br />for 1992 through 2000. Julys total production was the lowest on record as a result of less <br />than average precipitation for the second year and a record low for the month of April. July <br />• 81 <br />