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TYPICAL CROSS—SECTION OF PROPOSED WORKING PLATFORM AND SLURRY WALL <br /> SLURRY WALL CAP DETAIL <br /> 10 FT EXTERIOR CONTAINMENT BERM <br /> INTERIOR BERM 3 FT 5 FT }FT <br /> WORK PLATFORM (SEE NOTE 1) <br /> ELEVATION AS CONSTRUCTED <br /> INDICATED ON OF STOCKPILE FINES <br /> PROFILE (SEE NOTE 1) i'IzIzIzIIiPz'"I <br /> SPOIL/MIXING AREA I � �:I _!�•_I:'I_I_♦ <br /> SLURRY WALL 12 FTj, GRANULAR BACKFILL <br /> "` /A SOIL BENTONITE BACKFILL <br /> ALLUVIAL SOILS <br /> KEY-IN <br /> " SEDIMENTARY BEDROCK <br /> (SEE 3 FT <br /> 4 55 FT (MIN) <br /> LIMIT OF MINING <br /> \I 25 FT (MIN) <br /> 3M• 1V(MAX SLOPE) <br /> SLURRY WALL <br /> NO MINING ALLOWED <br /> MATERIAL MUST REMAIN IN <br /> SEE NOTE 13 PLACE FOR SLURRY WALL <br /> STABILITY <br /> NOTES: <br /> 1. WORKPAD SHALL BE CONSTRUCTED AT 1%MAXIMUM GRADE AND SHALL CONSIST OF ON-SITE OVERBURDEN SOILS.WORKPAD AND WORKPAD FILL SUBGRADE WITHIN 10 FT OF SLURRY WALL ALIGNMENT SHALL BE FREE <br /> FROM ROOTS OR OTHER ORGANIC MATERIAL.INTERIOR BERM SHALL BE CONSTRUCTED OF SUPPLEMENTAL FINES AS SPECIFIED IN THE DESIGN REPORT DATED XXXX.EXTERIOR CONTAINMENT BERM,IF NOT INCORPORATED <br /> INTO THE BACKFILL,CAN BE CONSTRUCTED OF ANY MATERIAL.IF THE EXTERIOR BERM WILL BE INCORPORATED INTO BACKFILL MIX,IT SHALL CONSIST OF SUPPLEMENTAL FINES. <br /> 2. THE PROPOSED SLURRY WALL WIDTH SHALL BE A MINIMUM OF 36 INCHES. <br /> 3. THE PROPOSED SLURRY WALL SHALL EXTEND FROM THE WORKING PLATFORM AND EXTEND INTO THE COMPETENT UNWEATHERED PIERRE SHALE A MINIMUM OF 4 FT,OR AS DIRECTED BY THE ENGINEER TO OBTAIN AN <br /> ADEQUATE"KEY-IN". <br /> 4. THE PROPOSED SLURRY WALL LEAD-IN SLOPES SHALL BE NO STEEPER THAN 1:1(HORIZONTAL:VERTICAL). BACKFILL SHALL BE PLACED USING THE LEAD-IN SLOPES. BACKFILL SHALL NOT FREE-FALL INTO THE TRENCH. <br /> 5. THE PROPOSED SLURRY WALL BACKFILL SHALL CONSIST OF A MIXTURE OF EXCAVATED SOILS(WORKING PLATFORM,OVERBURDEN,SAND AND GRAVEL),BENTONITE SLURRY,ADDITIONAL DRY BENTONITE,AND SOILS FROM <br /> THE INTERIOR BERM. BACKFILL SHALL HAVE THE GRADATION SPECIFIED IN THE DESIGN REPORT AND SLUMP OF 3 TO 6 INCHES. <br /> 6. ANY FROZEN BACKFILL MATERIAL SHALL BE REWORKED AND ACCEPTED BY THE ENGINEER PRIOR TO PLACING INTO THE TRENCH. <br /> 7. DRY BENTONITE SHALL BE ADDED TO THE BACKFILL MIXTURE,1 PERCENT BY DRY WEIGHT OF BACKFILL AND THOROUGHLY MIXED TO FORM A HOMOGENOUS MIX OF ALL BACKFILL MATERIALS PRIOR TO ANY BACKFILL <br /> PLACEMENT. <br /> 8. BEDROCK PIECES LARGER THAN 6 INCHES SHALL NOT BE USED IN BACKFILL. <br /> 9. BENTONITE SLURRY SHALL HAVE A MINIMUM MARSH FUNNEL VISCOSITY OF 40 SECONDS. <br /> 10. THE BACKFILL MIXTURE SHALL HAVE A UNIT WEIGHT WHICH IS A MINIMUM OF 15 POUNDS PER CUBIC FOOT GREATER THAN THAT OF THE BENTONITE SLURRY. <br /> 11. THE BACKFILL MIXTURE SHALL HAVE A PERMEABILITY OF LESS THAN 1.0 x 10-7 CENTIMETERS PER SECOND. <br /> 12.THE SLURRY WALL TRENCH DEPTH,INCLUDING THE BACKFILL SLOPE,SHALL BE PROFILED AT MINIMUM 20-FT INTERVALS AT THE BEGINNING AND END OF EACH WORK DAY TO MONITOR FOR CAVE-IN OR SEDIMENTATION IN <br /> THE BOTTOM OF THE TRENCH.THE BACKFILL SLOPE AND THE BOTTOM OF THE TRENCH SHALL BE CLEANED OUT PRIOR TO THE PLACEMENT OF BACKFILL. <br /> 13.AFTER SLURRY WALL CONSTRUCTION,THE CRESTS OF ANY PROPOSED TEMPORARY EXCAVATION SLOPES SHALL BE OFFSET A MINIMUM OF 25 FEET FROM THE SLURRY WALL. TEMPORARY EXCAVATION SLOPES <br /> ADJACENT TO THE SLURRY WALL SHOULD BE 3:1(HORIZONTAL:VERTICAL)OR FLATTER. PRELIMINARY <br /> o..Na <br /> cow NIEET <br /> LOLOFF CONSTRUCTION BRIERLEY LOLOFF SLURRY WALL SH-11 <br /> HALL—IRWIN ASSOCIATES a,.c NO. <br /> Creating Space Underground DETAIL SHEET 1 OF X <br /> MAME M. <br /> _ - _ �pp I ,-j" �' 990 303.7OUTHBSROADWAY,SUITE 2222,DENVER CO 80209 <br /> FAR 303 703 0209 n«�w 0 <br /> No DAZE REVISIONSBr fI1JA�ALI JMEN7-4-ZB 0WO - rut HES ,ate j ' CDK �" _ Iwo APR.29.20161 $1409-000 NTS <br />