1987-03-27_REVISION - C1981038 - Laserfiche WebLink

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4.0 INSPECTION 2.0 DEVELOPMENT ROCK DISPOSAL 3.0 RECLAMATION 1.0 ROAD MODIFICATIONS AND ENTRY PORTALS 2.1 GENERAL 3.1 GENERAL 4.1 ROCK ENTRY PORTALS AND ROAD DRAINAGE 1.1 GENERAL 2.1.1 ROCK PRODUCED DURING ENTRY DEVELOPMENT SHALL BE DISPOSED OF IN 4.1.1 CONSTRUCTION IN THE PORTAL AREAS AND INSTALLATION OF THE SURFACE- 1.1.1 ROAD MODIFICATIONS AND ENTRY PORTALS SHALL BE DEVELOPED IN ACCORD- ACCORDANCE WITH THE CONSTRUCTION DRAWINGS AND NOTES THEREON. 3.1.1 RECLAMATION OF THE ROCK SLOPE ENTRY PORTALS AND DEVELOPMENT ROCK WATER DRAINAGE SYSTEMS SHALL BE INSPECTED AND CERTIFIED AFTER DISPOSAL AREAS SHALL BE PERFORMED IN ACCORDANCE WITH THE CONSTRUCTION BY A QUALIFIED REGISTERED PROFESSIONAL ENGINEER. ANCE WITH THE CONSTRUCTION DRAWINGS AND ALL NOTES CONTAINED THEREON. 2.1.2 COLLUVIAL SOILS PRODUCED DURING INITIAL ENTRY DEVELOPMENT MAY BE CONSTRUCTION DRAWINGS AND ALL NOTES CONTAINED THERE DISPOSED OF IN THE CENTRAL PORTION OF THE DISPOSAL FILLS, USED FOR ROCK SLOPE ENTRY PORTALS AND ROAD CONSTRUCTION, OR USED FOR OTHER 3.1.2 RECLAMATION SHALL BE CONSISTENT WITH THE EXISTING RECLAMATION PLAN. 4.1.2 EXPERIENCED E ENGINEER STRUCTIONOFPORTAL FACEUPS TO SHALL E fi DURING ENSURETHATTHE FACEUPS ARE COM- 1.2 ROAD MODIFICATIONS AND TEMPORARY RAMP CONSTRUCTION APPROVED PURPOSES SUCH AS COVERING ROCK FILLS. PLETED IN ACCORDANCE WITH THESE SPECIFICATIONS. 3.1.3 ALL AREAS WHICH ARE NOT MODIFIED BY THE ROCK SLOPE ENTRY PORTALS 1.2.1 THE EXISTING MINE ACCESS ROAD SHALL BF, RELOCATED AS SHOWN ON THE 2.1.3 TOTAL IN VOLUME, OF EXCAVATED MATERIAL FROM THE THREE ENTRIES AND DEVELOPMENT ROCK DISPOSAL AREAS SHALL BE RECLAIMED IN ACCORD- 4.1.3 THE PORTAL AREAS SHALL BE INSPECTED DAILY WHILE ENTRY DEVELOPMENT CONSTRUCTION DRAWINGS. IS ESTIMATED TO BE 65,600 CUBIC YARDS. ASSUMING A SWELL FACTOR OF ANCE WITH THE EXISTING RECLAMATION PLAN. IS WITHIN SOILS AND UNTIL THE ENTRIES HAVE BEEN DEVELOPED TO AT 30 PERCENT, APPROXIMATELY 86,000 CUBIC YARDS OF EXCAVATED DEVELOP- LEAST 150 FEET FROM THE PORTALS IN ORDER TO IDENTIFY ANY IN- 1.2.2 BENCHES SHALL BE CONSTRUCTED AT INTAKE PORTAL AND RETURN PORTAL AT MENT ROCK AND SOIL WILL HAVE TO BE DISPOSED. 3,2 VENTILATION SHAFTS STABILITY THAT MAY DEVELOP IN THE SLOPES IN THE VICINITY OF THE PORTAL. 3. THE ELEVATIONS SHOWN ON THE CONSTRUCTION DRAWINGS. 2.1 VENTILATION SHAFTS SHALL BE BACKFILLED TO THE EXISTING FAN LEVEL 1.2.3 A TEMPORARY ACCESS RAMP TO THE BELTLINE PORTAL SHALL BE CONSTRUCTED 2.2 DISPOSAL LOCATIONS AND DISPOSAL AREA VOLUMES ELEVATION WITH DEVELOPMENT ROCK. USING A COMPACTED FILL PRIOR TO COMMENCING EXCAVATION OF THIS 4.2 DEVELOPMENT ROCK DISPOSAL 2.2.1 DEVELOPMENT ROCK SHALL INITIALLY DISPOSED OF BY DUMPING DOWN THE SHALL BE USED TO MAINTAIN THE LEVEL OF THE INTAKE AND RETURN VENTILATION SHAFTS LOCATED ON THE EXISTING FAN 3.2.2 ADDITIONAL ROCK OR SOIL ENTRY. 4.2.1 DEVELOPMENT ROCK DISPOSAL FILLS SHALL BE INSPECTED BY A QUALIFIED 1.2.4 THE FOUNDATION OF THE TEMPORARY ACCESS RAMP SHALL BE CLEARED OF ALL LEVEL. THE BOTTOMS OF THESE SHAFTS WERE PREVIOUSLY BACKFILLED; A SHAFT FILL AT THE FAN LEVEL ELEVATION IF THIS IS NECESSARY DUE TO REGISTERED PROFESSIONAL ENGINEER. VEGETATION, TRASH, WEAK ZONES, OR OTHER MATERIAL THAT COULD INFLU- TOTAL OF 6,000 CUBIC YARDS OF USABLE DISPOSAL VOLUME IS ESTIMATED SETTLEMENT OF FILL. ENCE THE STABILITY OF THE FILL. TO REMAIN IN THE TWO SHAFTS. 3.2.3 INTERIM RECLAMATION OF THE VENTILATION SHAFTS SHALL BF, IN ACCORD- 4.2.2 DISPOSAL INSPECTIONS SHALL OCCUR QUARTERLY, BEGINNING WITHIN 7 DAYS 1.2.5 THE FOUNDATION OF THE TEMPORARY ACCESS RAMP SHALL BE LEVELED PRIOR 2'2'2 BENCH EH SL AP CAPAC ITOY OF APPROXIMATELY 67,000 CUBIC YARDS PORTAL LEVEL ANCE WITH THE EXISTING RECLAMATION PLAN. AFTER FOUNDATION PREPARATION. INSPECTED TO PLACEMENT OF ANY FILL. 3.2.4 THE FAN LEVEL SHALL BE RECLAIMED UPON FINAL ABANDONMENT IN ACCORD- 4.2.3 IN ADDITION TO QUARTERLY INSPECTIONS, SITES SHALL BF. 1.2.6 FILL FOR THE TEMPORARY ACCESS RAMP CAN BE OBTAINED FROM ROAD EXCA- 2.2.3 THE DEVELOPMENT ROCK DISPOSAL AREA LOCATED ON THE EMPLOYEE PARKING ANCE WITH THE EXISTING RECLAMATION PLAN. DURING THE FOLLOWING CONSTRUCTION PERIODS: NATION, INITIAL DEVELOPMENT S THE INTAKE. AND RETURN ENTRIES, OR LOT HAS A CAPACITY OF APPROXIMATELY 16,000 CUBIC YARDS. A) COMPLETION OF FOUNDATION PREPARATION AND INSTALLATION OF PIPES OTHER SUITABLE APPROVED SOURCES. 3.3 ROCK SLOPE ENTRY PORTALS OR OTHER STRUCTURES THAT WOULD BE LOCATED WITHIN THE FILL; 1.2.7 TEMPORARY ACCESS RAMP FILL SHALE, BF. SPREAD IN APPROXIMATELY HORI- 2.3 SITE PREPARATION 3.3.1 ALL PIPES, UTILITY LINES, ETC. SHALL RF. REMOVED WHERE REQUIRED B) PLACEMENT AND COMPACTION OF FILL MATERIALS; AND ZONTAL LAYERS NOT EXCEEDING 12 INCHES IN LOOSE THICKNESS AND SHALL RE COMPACTED UNIFORMLY BY ROUTING CONSTRUCTION EQUIPMENT OVER THE 2.3.1 BOTH PORTAL LEVEL AND PARKING LOT DISPOSAL ARRAS ARE LOCATED ON BEFORE BACKFILL C) RECLAMATION. SURFACE OF THE FILL OR BY OTHER MEANS AS NECESSARY FOR ENSURINU THE APPROXIMATELY HORIZONTAL BENCHES CONSTRUCTED PRINCIPALLY WITHIN REQUIRED DEGREE OF COMPACTION. SOUND BEDROCK. MINIMAL FOUNDATION PREPARATION IS ANTICIPATED. 3.3.2 ROCK SLOPE ENTRY PORTALS SHALL BE BACKFILLED WITH NON- COMBUSTIBLE 4.2.4 THE INSPECTING ENGINEERS' CERTIFIED REPORTS SHALL BF'. MADE AVAILABLE MATERIAL FOR A MINIMUM DISTANCE OF 25 FEET' FROM THE. PORTAL OPENINGS UPON REQUEST TO THE COLORADO MINED LAND RECLAMATION DIVISION. THE 1.2.8 ALL COMPACTED SOIL FILL IN THE TEMPORARY ACCESS RAMP SHALL HAVE A 2.3.2 ANY POWER POLES OR STRUCTURES THAT REQUIRE RELOCATION WITHIN THE PER 30 CFR, 75.1711 -2. REPORTS WILL CERTIFY THAT THE FILL HAS BEEN CONSTRUCTED AS SPECI- DRY DENSITY OF AT LEAST 95 PERCENT OF THE MAXIMUM DRY DENSITY AS FILL AREAS SHALL BF. REMOVED PRIOR TO PLACEMENT OF ANY FILL. 3.3.3 THE ROCK SLOPE ENTRY PORTALS SHALL BF, BACKFILLED IN ACCORDANCE WITH FIND IN THE DESIGN. A COPY OF THE REPORTS SHALL BE RETAINED AT THE DETERMINED BY THE AMERICAN ASSOCIATION OF STATE HIGHWAYS AND MINE. TRANSPORTATION OFFICIALS (AASHTO) SPECIFICATION T99 -74 ( "STANDARD 2.3.3 THE S LOOT E OF THE EXCEED 208(H)Tl�V)IN THE VICINITY OF THE TOE OF THE FILL PLAN RECLAIMED SLOPE CONFIGURATIONS IN THE EXISTING RECLAMATION PROCTOR "). 1.2.9 THE. OU'CSLOPE OF THE TEMPORARY ACCESS RAMP SHALL NOT EXCEED 2'3'4 AND CATCH IN CONSTRUCTED AT THE 3.3.4 ACCORDANCE. WITHNTHEME ISTINGERECLAMATION PORTAL EPLANHALL BE RECLAIMED IN 1.5(H):1(V)• PRIOR TO PLACEMENT OF ANY FILL. 1.2.10 SUITABLE BARRICADES SHALL RE INSTALLED ALONG THE CREST OF THE 2,3.5 ANY ASPHALT PAVING IN THE TOE AREA OF THE FILLS SHALL BE REMOVED 'TEMPORARY ACCESS RAMP. WHERE THE FILL DEPTH WILL BE LESS THAN 4 FE 1.2.11 THE TEMPORARY ACCESS RAMP SHALL BE REMOVED AND THE GROUND SURFACE REGRADED TO THE PERMANENT BELTLINE PORTAL BENCH CONFIGURATION AFTER 2.3.6 INSTALLATION OF PRESSURE REGULATING PIPE OR ANY OTHER STRUCTURES THE FIRST SEGMENT OF HAULAGE CONVEYOR HAS BEEN INSTALLED. THAT WOULD PASS THROUGH THE FILLS SHALL BE COMPLETED PRIOR TO COMMENCEMENT OF FILL PLACEMENT. 2.3.7 EXISTING PORTALS ON THE PORTAL LEVEL SHALL BE BACKFILLED WITH NON- COMBUSTIBLE MATERIAL IN ACCORDANCE WITH 30 CFR 75.1711 PRIOR TO 3.4 PORTAL LEVEL ROCK DISPOSAL AREA COMMFNCEMENT OF ROCK FILL PLACEMENT. 3.4.1 THE CONFIGURATION OF CONSTRUCTED DISPOSAL FILL SHALL BE THE SAME AS THE RECLAIMED CONFIGURATION, EXCEPT AS NOTED IN 3.4.2. 3.4.2 PRIOR TO FINAL RECLAMATION, THE TOP OF THE FILL SHALL BE REGRADED IF NECESSARY TO ENSURE THE PERMANENT OVERLAND FLOW OF RUNOFF TOWARD THE PERMANENT DRAINAGE CHANNEL NORTH OF THE FILL. 3.4.3 SUBSEQUENT TO CONSTRUCTION OF THE FILL, FILL OUTSLOPES SHALL BE 1.2.12 THE OUTSLOPE OF T14E PERMANENT BELTLINE PORTAL BENCH SHALE, NOT EX- 2.4 CONSTRUCTION REVEGETATED IN ACCORDANCE WITH THE VEGETATION PLAN. VEGETATION SHALL BE MONITORED AND IF VEGETATION GROWTH IS UNSUCCESSFFULUL, , ADDI- CEED 2(H):1(V). DI- 2.4.1 TUNNEL DEVELOPMENT ROCK SHALL BE SPREAD IN APPROXIMATELY HORIZONTAL TIONAL COVER OF THE BEST AVAILABLE MATERIAL OR SOIL TREATMENTS LAYERS NOT EXCEEDING 24 INCHES IN LOOSE THICKNESS AND UNIFORMLY SHALL BE APPLIED. COMPACTED BY ROUTING CONSTRUCTION EQUIPMENT OVER THE SURFACE OF THE 1.3 SURFACE DRAINAGE LIFT. 1.3.1 THE EXISTING SURFACE DRAINAGE SYSTEM SHAL!, BE DISRUPTED TO THE 3.5 PARKING LOT ROCK DISPOSAL AREA MINIMUM EXTEI4T POSSIBLE DURING CONSTRUCTION. 2.4.2 SURFACE DRAINAGE OF THE FILL SHALL BE MAINTAINED THROUGHOUT CON- STRUCTION BY GRADING THE SURFACE TO A MINIMUM SLOPE OF 2 PERCENT 3.5.1 THE CONFIGURATION OF THE SURFACE AND OUTSLOPE OF THE CONSTRUCTED RECEIVED �� 1.3.2 WHERE. THE EXISTING DRAINAGE SYSTEM WOULD BE DISRUPTED, SURFACE AND ENSURING THAT NO SIGNIFICANT SURFACE DEPRESSIONS EXIST. FILL SHALL BE THE SAME AS THE RECLAIMED CONFIGURATION, EXCEPT WHERE 'gyp DRAINAGE MODIFICATIONS SPECIFIED ON THE CONSTRUCTION DRAWINGS SHALE, THE FILL IS REGRADED UPON FINAL ABANDONMENT FOR CONSTRUCTION OF A 1987 HE COMPLETED AS QUICKLY AS POSSIBLE TO RESTORE, DRAINAGE. 2.4.3 NO FILL MATERIAL SHALL BE PLACED ON STANDING WATER, SNOW, OR ICE; PERMANENT DRAINAGE CHANNEL. PdAR 27 NOR SHALL SNOW, ICE, OR OTHER DELETERIOUS MATERIALS BE INCORPORATED MINED LA14D INTO THE FILL. 3.5.2 A 10 -FOOT (MINIMUM) HEIGHT BUTTRESS FILL SHALL BE CONSTRUCTED AT THE TOE OF THE ROCK CUT AT THE NORTH END OF THE FILL. THE FILL DECLAMATION DIVISION 1.4 PORTAL DEVELOPMENT 2.4.4 IT IS ANTICIPATED THAT FILL MATERIALS WILL CONSIST PREDOMINANTLY OF BUTTRESS SHALL HAVE A 2(H):1(V) OUTSLOPE. 1.4.1 TUNNEL FACEUPS FOR PORTAL DEVELOPMENT SHALL NOT COMMENCE UNTIL THE FRESH SANDSTONES WITH A LIMITED AMOUNT OF SHALE. ANY MATERIALS 3.5.3 THE FILL BUTTRESS SHALL BE CONSTRUCTED BY PLACING FILL IN TUNNELING CONTRACTOR OR CREW ARE READY TO COMMENCE TUNNELING. THAN UTHE REXPECTED MFILL LMATERIALASHALL SBENTHOR THOROUGHLY MOIXED WITH E MORE HORIZONTAL LIFTS NOT EXCEEDING 24 INCHES IN LOOSE THICKNESS AND COMPACTED UNIFORMLY BY ROUTING CONSTRUCTION EQUIPMENT OVER THE FILL 1.4.2 TUNNEL FACEUPS SHALL BF. LIMITED 'f0 THE SIZE OF THE ENTRIES; NO COMPETENT MATERIALS AN OR SHALL BE DISPOSED AOFDINN THE TVENTILATION SURFACE. EXCESS EXCAVATION FOR THE PORTAL SHALL BE PERMITTED WITHOUT THE PORTIONS OF THE FILLS, EXPRESS CONSENT OF COLORADO WESTMORELAND INC. OR ITS AUTHORIZED WEAK THE MATERIALS SHALL INCORPORATED INTO THE FILL 3.5.4 COMPACTED SOIL IN THE BUTTRESS SHALL HAVE A DRY DENSITY OF AT LEAST FOUNDATION OR REPRESENTATIVE. 90 PERCENT OF THE MAXIMUM DRY DENSITY AS DETERMINED BY THE AASHTO 1.4.3 COLLUVIAL SOILS OVERLYING THE ENTRIES SHALL BE FULLY SUPPORTED 2.4.5 THE CONSTRUCTED HEIGHT OF THE PORTAL AREA FILL SHALL EXCEED THE T99 -74 SPECIFICATION ( "STANDARD PROCTOR "). THROUGHOUT 'LL SOFT GROUND TUNNELING TO ENSURE THAT NO DEFORMATIONS DESIGN HEIGHT BY APPROXIMATELY 5 PERCENT TO INSURE THAT FUTURE 3.5.5 UPON FINAL ABANDONMENT, A PERMANENT DRAINAGE. CHANNEL, SIZED IN THAT COULD RESULT IN SLOPE INSTABILITY ARE PERMITTED TO DEVELOP. SETTLEMENT OF THE FILL WILL NOT DISRUPT THE NORTHERLY DIRECTION OF THE SURFACE DRAINAGE OF THE 'TOP OF THE FILL. ACCORDANCE WITH THE EXISTING RECLAMATION PLAN, SHALL BE CONSTRUCTED ACROSS THE FILL SURFACE, AS SHOWN ON THE CONSTRUCTION DRAWINGS, AT 1.4.4 ALL TUNNELING IN THE VICINITY OF THE PORTAL SHALL BF, UNDERTAKEN IN A MINIMUM DISTANCE OF 5 FEET FROM THE TOE OF THE FILL BUTTRESS. SUCH A MANNER 'fHA'1' THERE ARE NCi EXCF.SSIVF. VIBRATIONS THAT COULD ? 5 INSPECTIONS RESULT IN SLOPE INSTABILITY. 3.5.6 THE EAST END OF THE FILL SHALL BE GRADED AT 10 PERCENT TO THE EAST 2.5.1 FILLS SHALL RE INSPECTED DURING CONSTRUCTION IN ACCORDANCE WITH FOR FINAL RECLAMATION SO THAT THE PERMANENT DRAINAGE CHANNEL DOES SECTION 4.0 OF THESE SPECIFICATIONS. NOT DISCHARGE OVER THE FILL OUTSLOPE. 3.5.7 THE PERMANENT DRAINAGE CHANNEL SHALL BE RIPRAPPED IN ACCORDANCE WITH THE EXISTING RECLAMATION PLAN WHERE ITS GRADIENT EXCEEDS 10 PERCENT. 3.5.8 SUBSEQUENT TO CONSTRUCTION OF THE FILL, THE FILL OUTSLOPE SHALL BE /� 1^' >��o REVEGETATED IN ACCORDANCE WITH THE EXISTING VEGETATION PLAN. VEGETATION ON THE FILLS SHALL BE MONITORED AND IF VEGETATION GROWTH IS UNSUCCESSFUL, ADDITIONAL COVER OF THE BEST AVAILABLE MATERIAL OR SOIL TREATMENTS SHALL BE APPLIED. 7 aoa 004 o56