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`~ I <br />~ .~ <br />$~lu Y7"~~1~I~1~CT[lpYt-I~ ~ <br />WORKING GRADE <br />FOR SLURRY TRENCH <br />APPROXIMATE TOP OF <br />WEATHERED/ FRACTURED <br />ROCK <br />RETENTION <br />EMBANKMENT <br />~APPRO%IMA7E E%IS TING <br />I GROUND SURFACE <br />Sacpa.ye ce)~ca~/o~c >-rL-n.L~i <br />~ ~-DRAINAGE TRENCH <br />(LEADS TO SUMP) <br />SLURRY WALL <br />u <br />APPROXIMATE TOP OF <br />IMPERVIOUS ROCK <br />u • <br />SLURRY WALL CUT-OFF "° ;•/."" <br />Figure 4 <br />