2009-03-05_PERMIT FILE - M2008080 (3)

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v 0 j r � � N Ito°' E � m a y a a > w Q u o p ® a wMw M E o r n Y o ° a ti PERMIT BOUNDARY EXISTING GROUND 25' 3.17 LEGEND: .r UTILITY POLE > GUY WIRE G 4 GAS LINE MARKER PERMIT GAS VALVE BOUNDARY OVERBURDEN AND TOPSOIL *DISTANCE VARIES 12.5' BACKFILL ALL DISTURBED AREAS EXISTING DOWN TO WATER SURFACE ® WELL WATER METER GROUND /\ T S 08 �� / VARIES / / ® �� 4591' WATER FAUCET r..._� ..-� w _ SLURRY WALL" WATER LINE MARKER ® ELECTRIC TRANSFORMER SAND AND GRAVEL' / p 3 .7 ^' TREE S<OpF TELEPHONE PEDESTAL E MARKER PROPERTY LINE 44 �jBEDROC �j / ' ��i' X .. _ -- --- - -- FENCE LINE oEoc - -- OVERHEAD ELECTRIC LINE TY PICAL BACKFILL SECTION EXISTING DUKE GAS — N.T.S. UNDERGROUND WATER LINE EXISTING CONTOURS (2' INTERVALS) — — — — _. — — GRAVEL ROAD _ PROPOSED PERMIT BOUNDARY BACKFILL EXISTING TRENCH WITH NATIVE — — PROPOSED SLURRY WALL MATERIALS 4640 PROPOSED CONTOURS ... PERIMETER DRAIN INLET /OUTLET FACILITY OVERBURDEN AND TOPSOIL 33' BACKFILL ALL DISTURBED AREAS f 12.5' DOWN TO WATER SURFACE �— 200 400 SCALE IN FEET M e TYPICAL BACKFILL SE TION N.T.S. 4591' 4a 1. oenconRe opecmcanons YP /PV ratio API Std. 13A less than 3 Viscometer greater than 30 Filtrate Loss less than 15 cm3 Moisture Content ASTM D 2216 less than 10 percent Test results for each lot of bentonite must be provided. 2. Water Specifications pH 6 -8 Hardness less than 200 ppm Total Dissolved Solids less than 500ppm Oil, organics, acids, alkali less than 50 ppm each Chloride report 3. Bentonite Slurry General Specifications The initial bentonite slurry must be tested prior to placement in the trench. The slurry may be mixed in high shear mixers or mixed and hydrated in slurry hydration ponds. In general, a minimum hydration time of 8 hours will allow the bentonite slurry to meet all criteria. A minimum bentonite content of 6 percent in the slurry by weight is required. 4. Bentonite Slurry Testing Specifications before Placement Viscosity Measured w/ Marsh Funnel (API RP 136 -1) less than 40 sec Density less than 64 pcf Filtrate Loss less than 20 cm3 pH 6.5 to 10 The tests listed above should be run i or 2 times per shift and at least once per batch of slurry. The slurry must be further tested after placement in the trench. The tests conducted are for viscosity, density, sand content, and pH. Two sets of tests per shift at two locations in the trench (approximately 2 feet below the slurry surface and 2 feet above the bottom of the trench) are required. If the density of the slurry in the trench exceeds 85 pcf the excess solids must be removed by desandi'ng or the slurry replaced with fresh slurry. The slurry level must be maintained at least 3 feet above the ground water elevation and no more than 2 feet below the top of the working platform. 5. Uentoni e Slurry Testing Specifications after Placement Unit Weight 1.03 to 1.40 gm /cm3 Sand Content ASTM D 4381- 84(1993)e10 to 20 percent by volume 6. Soil — Bentonite Ba kfill 5pecifications S —B backfill slump ASTM C 143 1 set per 100 cu. yds. Slump 2 -6 inches S —B backfill gradation 1 set per 300 cu. yds. Screen (US Standard) Percent by Dry Weight 3 inch 100 # 4 40 -80 #40 25 -60 #200 20 -40 Minimum Plasticity Index of 10 7. Key Trench and Slurry Wall Cop Specifications During excavation, soundings should be obtained to determine the elevations of the top of the key layer, the bottom of the excavation, and the bottom of the trench prior to backfilling. If sediments in excess of 2 inches have accumulated it is necessary to clean the trench bottom by airlift pumps or excavation equipment to remove the sand and sediment that has settled. The trench bottom should be cleaned, as a minimum, at the beginning of each shift. Soundings should be obtained approximately every 20 feet. Adequate keying in the S —B backfill to an impermeable layer at the base of the wall will be required and specified in the final design report for the slurry wall. The design documents will include a description of the key in layer and describe how trench cuttings or other observations will be used to assure that the slurry wall will be adequately keyed. Temporary slurry wall protection will be required in the form of a noncompacted soil cover placed within one day over each backfilled 100 foot reach. The temporary cover is removed after settlement (approximately 2 weeks) and replaced with a compacted clay cover over the completed slurry wall. 8. Post Construction Testing Post construction testing will be conducted in accordance with the "Colorado State Engineer's Office." 9. Above specifications (notes 1 -8) are provided as a general guideline for permitting purposes. Final specifications and design criteria will be developed during the final design of the slurry wall. i Sheet: 1" = 200' Of: 1 , SLURRY WALL NOTES: 3' a CO IL 4d 00 FL .Q C •m O K N W co U 01 H ir PERMIT BOUNDARY EXISTING GROUND 25' 3.17 LEGEND: .r UTILITY POLE > GUY WIRE G 4 GAS LINE MARKER PERMIT GAS VALVE BOUNDARY OVERBURDEN AND TOPSOIL *DISTANCE VARIES 12.5' BACKFILL ALL DISTURBED AREAS EXISTING DOWN TO WATER SURFACE ® WELL WATER METER GROUND /\ T S 08 �� / VARIES / / ® �� 4591' WATER FAUCET r..._� ..-� w _ SLURRY WALL" WATER LINE MARKER ® ELECTRIC TRANSFORMER SAND AND GRAVEL' / p 3 .7 ^' TREE S<OpF TELEPHONE PEDESTAL E MARKER PROPERTY LINE 44 �jBEDROC �j / ' ��i' X .. _ -- --- - -- FENCE LINE oEoc - -- OVERHEAD ELECTRIC LINE TY PICAL BACKFILL SECTION EXISTING DUKE GAS — N.T.S. UNDERGROUND WATER LINE EXISTING CONTOURS (2' INTERVALS) — — — — _. — — GRAVEL ROAD _ PROPOSED PERMIT BOUNDARY BACKFILL EXISTING TRENCH WITH NATIVE — — PROPOSED SLURRY WALL MATERIALS 4640 PROPOSED CONTOURS ... PERIMETER DRAIN INLET /OUTLET FACILITY OVERBURDEN AND TOPSOIL 33' BACKFILL ALL DISTURBED AREAS f 12.5' DOWN TO WATER SURFACE �— 200 400 SCALE IN FEET M e TYPICAL BACKFILL SE TION N.T.S. 4591' 4a 1. oenconRe opecmcanons YP /PV ratio API Std. 13A less than 3 Viscometer greater than 30 Filtrate Loss less than 15 cm3 Moisture Content ASTM D 2216 less than 10 percent Test results for each lot of bentonite must be provided. 2. Water Specifications pH 6 -8 Hardness less than 200 ppm Total Dissolved Solids less than 500ppm Oil, organics, acids, alkali less than 50 ppm each Chloride report 3. Bentonite Slurry General Specifications The initial bentonite slurry must be tested prior to placement in the trench. The slurry may be mixed in high shear mixers or mixed and hydrated in slurry hydration ponds. In general, a minimum hydration time of 8 hours will allow the bentonite slurry to meet all criteria. A minimum bentonite content of 6 percent in the slurry by weight is required. 4. Bentonite Slurry Testing Specifications before Placement Viscosity Measured w/ Marsh Funnel (API RP 136 -1) less than 40 sec Density less than 64 pcf Filtrate Loss less than 20 cm3 pH 6.5 to 10 The tests listed above should be run i or 2 times per shift and at least once per batch of slurry. The slurry must be further tested after placement in the trench. The tests conducted are for viscosity, density, sand content, and pH. Two sets of tests per shift at two locations in the trench (approximately 2 feet below the slurry surface and 2 feet above the bottom of the trench) are required. If the density of the slurry in the trench exceeds 85 pcf the excess solids must be removed by desandi'ng or the slurry replaced with fresh slurry. The slurry level must be maintained at least 3 feet above the ground water elevation and no more than 2 feet below the top of the working platform. 5. Uentoni e Slurry Testing Specifications after Placement Unit Weight 1.03 to 1.40 gm /cm3 Sand Content ASTM D 4381- 84(1993)e10 to 20 percent by volume 6. Soil — Bentonite Ba kfill 5pecifications S —B backfill slump ASTM C 143 1 set per 100 cu. yds. Slump 2 -6 inches S —B backfill gradation 1 set per 300 cu. yds. Screen (US Standard) Percent by Dry Weight 3 inch 100 # 4 40 -80 #40 25 -60 #200 20 -40 Minimum Plasticity Index of 10 7. Key Trench and Slurry Wall Cop Specifications During excavation, soundings should be obtained to determine the elevations of the top of the key layer, the bottom of the excavation, and the bottom of the trench prior to backfilling. If sediments in excess of 2 inches have accumulated it is necessary to clean the trench bottom by airlift pumps or excavation equipment to remove the sand and sediment that has settled. The trench bottom should be cleaned, as a minimum, at the beginning of each shift. Soundings should be obtained approximately every 20 feet. Adequate keying in the S —B backfill to an impermeable layer at the base of the wall will be required and specified in the final design report for the slurry wall. The design documents will include a description of the key in layer and describe how trench cuttings or other observations will be used to assure that the slurry wall will be adequately keyed. Temporary slurry wall protection will be required in the form of a noncompacted soil cover placed within one day over each backfilled 100 foot reach. The temporary cover is removed after settlement (approximately 2 weeks) and replaced with a compacted clay cover over the completed slurry wall. 8. Post Construction Testing Post construction testing will be conducted in accordance with the "Colorado State Engineer's Office." 9. Above specifications (notes 1 -8) are provided as a general guideline for permitting purposes. Final specifications and design criteria will be developed during the final design of the slurry wall. i Sheet: 1" = 200' Of: 1 , SLURRY WALL NOTES: 3' J � d � H 25' DITCH OFFSET 1` L 4 co 5`Opfi 4W C O xt�ON C BOTTOM OF DITCH 4D BANK SLOPE ` / N SOUTH BRANCH PLUMB DITCH 4 ' OFFSET DETAIL C i N.T.S. L 3 o PERMIT BOUNDARY EXISTING GROUND 25' 3.17 LEGEND: .r UTILITY POLE > GUY WIRE G 4 GAS LINE MARKER PERMIT GAS VALVE BOUNDARY OVERBURDEN AND TOPSOIL *DISTANCE VARIES 12.5' BACKFILL ALL DISTURBED AREAS EXISTING DOWN TO WATER SURFACE ® WELL WATER METER GROUND /\ T S 08 �� / VARIES / / ® �� 4591' WATER FAUCET r..._� ..-� w _ SLURRY WALL" WATER LINE MARKER ® ELECTRIC TRANSFORMER SAND AND GRAVEL' / p 3 .7 ^' TREE S<OpF TELEPHONE PEDESTAL E MARKER PROPERTY LINE 44 �jBEDROC �j / ' ��i' X .. _ -- --- - -- FENCE LINE oEoc - -- OVERHEAD ELECTRIC LINE TY PICAL BACKFILL SECTION EXISTING DUKE GAS — N.T.S. UNDERGROUND WATER LINE EXISTING CONTOURS (2' INTERVALS) — — — — _. — — GRAVEL ROAD _ PROPOSED PERMIT BOUNDARY BACKFILL EXISTING TRENCH WITH NATIVE — — PROPOSED SLURRY WALL MATERIALS 4640 PROPOSED CONTOURS ... PERIMETER DRAIN INLET /OUTLET FACILITY OVERBURDEN AND TOPSOIL 33' BACKFILL ALL DISTURBED AREAS f 12.5' DOWN TO WATER SURFACE �— 200 400 SCALE IN FEET M e TYPICAL BACKFILL SE TION N.T.S. 4591' 4a 1. oenconRe opecmcanons YP /PV ratio API Std. 13A less than 3 Viscometer greater than 30 Filtrate Loss less than 15 cm3 Moisture Content ASTM D 2216 less than 10 percent Test results for each lot of bentonite must be provided. 2. Water Specifications pH 6 -8 Hardness less than 200 ppm Total Dissolved Solids less than 500ppm Oil, organics, acids, alkali less than 50 ppm each Chloride report 3. Bentonite Slurry General Specifications The initial bentonite slurry must be tested prior to placement in the trench. The slurry may be mixed in high shear mixers or mixed and hydrated in slurry hydration ponds. In general, a minimum hydration time of 8 hours will allow the bentonite slurry to meet all criteria. A minimum bentonite content of 6 percent in the slurry by weight is required. 4. Bentonite Slurry Testing Specifications before Placement Viscosity Measured w/ Marsh Funnel (API RP 136 -1) less than 40 sec Density less than 64 pcf Filtrate Loss less than 20 cm3 pH 6.5 to 10 The tests listed above should be run i or 2 times per shift and at least once per batch of slurry. The slurry must be further tested after placement in the trench. The tests conducted are for viscosity, density, sand content, and pH. Two sets of tests per shift at two locations in the trench (approximately 2 feet below the slurry surface and 2 feet above the bottom of the trench) are required. If the density of the slurry in the trench exceeds 85 pcf the excess solids must be removed by desandi'ng or the slurry replaced with fresh slurry. The slurry level must be maintained at least 3 feet above the ground water elevation and no more than 2 feet below the top of the working platform. 5. Uentoni e Slurry Testing Specifications after Placement Unit Weight 1.03 to 1.40 gm /cm3 Sand Content ASTM D 4381- 84(1993)e10 to 20 percent by volume 6. Soil — Bentonite Ba kfill 5pecifications S —B backfill slump ASTM C 143 1 set per 100 cu. yds. Slump 2 -6 inches S —B backfill gradation 1 set per 300 cu. yds. Screen (US Standard) Percent by Dry Weight 3 inch 100 # 4 40 -80 #40 25 -60 #200 20 -40 Minimum Plasticity Index of 10 7. Key Trench and Slurry Wall Cop Specifications During excavation, soundings should be obtained to determine the elevations of the top of the key layer, the bottom of the excavation, and the bottom of the trench prior to backfilling. If sediments in excess of 2 inches have accumulated it is necessary to clean the trench bottom by airlift pumps or excavation equipment to remove the sand and sediment that has settled. The trench bottom should be cleaned, as a minimum, at the beginning of each shift. Soundings should be obtained approximately every 20 feet. Adequate keying in the S —B backfill to an impermeable layer at the base of the wall will be required and specified in the final design report for the slurry wall. The design documents will include a description of the key in layer and describe how trench cuttings or other observations will be used to assure that the slurry wall will be adequately keyed. Temporary slurry wall protection will be required in the form of a noncompacted soil cover placed within one day over each backfilled 100 foot reach. The temporary cover is removed after settlement (approximately 2 weeks) and replaced with a compacted clay cover over the completed slurry wall. 8. Post Construction Testing Post construction testing will be conducted in accordance with the "Colorado State Engineer's Office." 9. Above specifications (notes 1 -8) are provided as a general guideline for permitting purposes. Final specifications and design criteria will be developed during the final design of the slurry wall. i Sheet: 1" = 200' Of: 1 , SLURRY WALL NOTES: 3'