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- 13 - <br />soils and embankment bo prevent slippage. Many manufacturers <br />• of synthetic liners reoomaerd maxim~n slopes of 3(H):1(V) to <br />prevent excessive stresses within the liner. <br />(3) A positive cutoff may also be constructed beneath the <br />eubaniaoent to limit seepage. The artoff would consist of a <br />trench extended 2 feet intro bedrock and backfilled with a <br />relatively iugervious clay. The width of the trench could be <br />minimized to a width of 2 feet by constructing the trench by <br />the slurry method. in this case, a slurry consisting of <br />local clays, bentonite and water would be maintained in the <br />trench as the cutoff is advanced to bedrock. The slurry <br />would remain in place and would serve as the permanent <br />inQervious cutoff wall. <br />• The choice of the above methods should be based on economics, ease <br />of construction and available materials. <br />2~:~ • :~• SF~ <br />~~,1S7Fti •,C.L <br />?' CO•: <br />1033ii <br />`' <br />~:-~ <br />~p,c L u ,. <br />~'~'~ <br />NK/lmt/bn <br />CHEN AND ASSOCIATES, INC. <br />Narender K , P.E. <br />ideviewed B r- ' / <br />is O. Sealy, P.E. <br /> <br />• <br /> <br />