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200 100 0 <br />200 <br />400 <br />600 <br />G <br />R <br />SCALE IN FEET <br />SANDY CLAY <br />GAS VALVE <br />EXISTING 25' <br />GROUND <br />PERMIT <br />BOUNDARY • DISTANCE VARIES �`�` 72.5' BACKF OVERBURDEN AND TOPSOIL <br />EXISTING I OWN TO WATER SURF RS <br />ACE <br />G I VARIES <br />4591 <br />a TYPICAL BACKFILL SECTION <br />N.T.S. <br />BACKFILL EXISTING <br />TRENCH WITH NATIVE <br />MATERIALS <br />I <br />. <br />UTILITY POLE <br />GUY WIRE <br />G <br />R <br />GAS LINE MARKER <br />SANDY CLAY <br />GAS VALVE <br />t. <br />WELL <br />1 <br />.5' TYP. <br />- <br />OVERBURDEN . <br />P <br />WATER LINE MARKER <br />A <br />ELECTRIC TRANSFORMER <br />Q <br />TREE <br />. VARIES ASTM C33 -7 _ <br />TELEPHONE PEDESTAL <br />T <br />TELEPHONE LINE MARKER <br />- <br />. CONCRETE. <br />--� -- x- <br />FENCE LINE <br />of of <br />OVERHEAD ELECTRIC LINE <br />. <br />. <br />.AGGREGATE <br />UNDERGROUND WATER LINE <br />11 - -M-- <br />—4640— <br />EXISTING CONTOURS (2' INTERVALS) <br />GRAVEL ROAD <br />PROPOSED PERMIT BOUNDARY <br />---- <br />PROPOSED SLURRY WALL <br />4640 <br />-2 <br />. <br />PERIMETER DRAIN <br />(MIN) <br />a <br />a <br />ASTM C33 <br />- - <br />- CONCRETE SAND <br />- <br />- - <br />(IF REQUIRED) <br />-.. <br />VARIES'a <br />a <br />4.0' <br />SAND AND GRAVEL <br />ALLUVIUM <br />aa. <br />. 1.5' <br />a Og' <br />9 <br />.05' <br />(TYP.) <br />.. <br />(TYP.).. <br />TYP. <br />L <br />[— 3' <br />1-4 - <br />'.. -- 4 ' ------- -------------- <br />DRAIN DETAIL (TYPICAL SECTION IF REQUIRED) <br />)UTLET N.T.S. <br />f <br />SLURRY WALL NOTES: <br />OVERBURDEN AND TOPSOIL <br />33' BACKFILL ALL DISTURBED AREAS <br />I-- 12.5' DOWN TO WATER SURFACE <br />- -- <br />® TYPICAL BACKFILL SECTION <br />N.T.S. <br />3' <br />1. Bentonite Specifications <br />YP /PV ratio API Std. 13A less than 3 <br />Viscometer greater than 30 <br />Filtrate Loss less than 15 cm3 <br />Moisture Content ASTM D 2216 less than 10 percent <br />Test results for each lot of bentonite must be provided. <br />2. Water Specifications <br />pH 6 -8 <br />Hardness less than 200 ppm <br />Total Dissolved Solids less than 500ppm <br />Oil, organics, acids, alkali less than 50 ppm each <br />Chloride report <br />3. 8entonite Slurry General Specifications <br />The initial bentonite slurry must be tested prior to placement in <br />the trench. The slurry may be mixed in high shear mixers or <br />mixed and hydrated in slurry hydration ponds. In general, a <br />minimum hydration time of 8 hours will allow the bentonite slurry <br />to meet all criteria. A minimum bentonite content of 6 percent in <br />the slurry by weight is required. <br />4. Bentonite Slur Testing Specifications before Placement <br />Viscosity Measured w/ Marsh Funnel (API RP 136 -1) less <br />than 40 sec <br />Density less than 64 pcf <br />Filtrate Loss less than 20 cm3 <br />pH 6.5 to 10 <br />The tests listed above should be run 1 or 2 times per shift and <br />at least once per batch of slurry. The slurry must be further <br />tested after placement in the trench. The tests conducted are for <br />viscosity, density, sand content, and pH. Two sets of tests per <br />shift at two locations in the trench (approximately 2 feet below <br />the slurry surface and 2 feet above the bottom of the trench) <br />are required. If the density of the slurry in the trench exceeds 85 <br />pcf the excess solids must be removed by desanding or the slurry <br />replaced with fresh slurry. The slurry level must be maintained at <br />least 3 feet above the ground water elevation and no more than <br />2 feet below the top of the working platform. <br />5. Bentonite SlurryJp�jflng Specifications after Placement <br />Unit Weight 1.03 to 1.40 gm /cm3 <br />Sand Content ASTM D 4381- 84(1993)e10 to 20 percent by <br />volume <br />LEGEND: <br />25' .�I DITCH <br />OFFSET <br />BOTTOM OF DITCH <br />BANK SLOPE <br />SOUTH BRANCH PLUMB DITCH <br />C OFFSEIE DETAIL <br />N.T.S. <br />6. Soil - 8entonite Backfill Specifications <br />S —B backfill slump ASTM C 143 1 set per 100 cu. yds. <br />Slump 2 -6 inches <br />S —B backfill gradation 1 set per 300 cu. yds. <br />Screen (US Standard) Percent by Dry Weight <br />3 inch 100 <br /># 4 40 -80 <br />#40 25 -60 <br />#200 20 -40 <br />Minimum Plasticity Index of 10 <br />7. Key Trench and Slurry Wall CapSpecificatlons <br />During excavation, soundings should be obtained to determine the <br />elevations of the top of the key layer, the bottom of the <br />excavation, and the bottom of the trench prior to backfilling. If <br />sediments in excess of 2 inches have accumulated it is necessary <br />to clean the trench bottom by airlift pumps or excavation <br />equipment to remove the sand and sediment that has settled. The <br />trench bottom should be cleaned, as a minimum, at the beginning <br />of each shift. Soundings should be obtained approximately every <br />20 feet. <br />Adequate keying in the S —B backfill to an impermeable layer at <br />the base of the wall will be required and specified in the final <br />design report for the slurry wall. The design documents will include <br />a description of the key in layer and describe how trench cuttings <br />or other observations will be used to assure that the slurry wall <br />will be adequately keyed. Temporary slurry wall protection will be <br />required in the form of a noncompacted soil cover placed within <br />one day over each backfilled 100 foot reach. The temporary cover <br />is removed after settlement (approximately 2 weeks) and replaced <br />with a compacted clay cover over the completed slurry wall. <br />8. Post Construction Testing <br />Post construction testing will be conducted in accordance with the <br />"Colorado State Engineer's Office." <br />9. Above specifications (notes 1 -8) are provided as a general <br />guideline for permitting purposes. Final specifications and design <br />criteria will be developed during the final design of the slurry wall. <br />0 <br />oT: � <br />� 9 a <br />. � N N <br />oo 0 o <br />in <br />0 <br />15A X <br />NULL a <br />p > c <br />c <br />v N��� <br />N� <br />� m <br />M <br />`v <br />0 <br />am <br />X <br />W <br />E. <br />i. <br />d <br />X41 <br />'a <br />J m <br />J (L <br />w H <br />d a <br />d <br />i 3 <br />3 O <br />7 <br />C <br />a <br />c <br />0 <br />E <br />. co <br />(D <br />cc <br />a) <br />C <br />`w <br />Q <br />JCY 1 <br />Scale 1` _ <br />1Of: 1 <br />1 <br />UTILITY POLE <br />GUY WIRE <br />G <br />R <br />GAS LINE MARKER <br />® <br />GAS VALVE <br />WELL <br />® <br />WATER METER <br />WATER FAUCET <br />W <br />P <br />WATER LINE MARKER <br />A <br />ELECTRIC TRANSFORMER <br />Q <br />TREE <br />Ln <br />TELEPHONE PEDESTAL <br />T <br />TELEPHONE LINE MARKER <br />®� r <br />PROPERTY LINE <br />--� -- x- <br />FENCE LINE <br />of of <br />OVERHEAD ELECTRIC LINE <br />EXISTING DUKE GAS <br />— ,r w <br />UNDERGROUND WATER LINE <br />11 - -M-- <br />—4640— <br />EXISTING CONTOURS (2' INTERVALS) <br />GRAVEL ROAD <br />PROPOSED PERMIT BOUNDARY <br />---- <br />PROPOSED SLURRY WALL <br />4640 <br />PROPOSED CONTOURS <br />PERIMETER DRAIN <br />25' .�I DITCH <br />OFFSET <br />BOTTOM OF DITCH <br />BANK SLOPE <br />SOUTH BRANCH PLUMB DITCH <br />C OFFSEIE DETAIL <br />N.T.S. <br />6. Soil - 8entonite Backfill Specifications <br />S —B backfill slump ASTM C 143 1 set per 100 cu. yds. <br />Slump 2 -6 inches <br />S —B backfill gradation 1 set per 300 cu. yds. <br />Screen (US Standard) Percent by Dry Weight <br />3 inch 100 <br /># 4 40 -80 <br />#40 25 -60 <br />#200 20 -40 <br />Minimum Plasticity Index of 10 <br />7. Key Trench and Slurry Wall CapSpecificatlons <br />During excavation, soundings should be obtained to determine the <br />elevations of the top of the key layer, the bottom of the <br />excavation, and the bottom of the trench prior to backfilling. If <br />sediments in excess of 2 inches have accumulated it is necessary <br />to clean the trench bottom by airlift pumps or excavation <br />equipment to remove the sand and sediment that has settled. The <br />trench bottom should be cleaned, as a minimum, at the beginning <br />of each shift. Soundings should be obtained approximately every <br />20 feet. <br />Adequate keying in the S —B backfill to an impermeable layer at <br />the base of the wall will be required and specified in the final <br />design report for the slurry wall. The design documents will include <br />a description of the key in layer and describe how trench cuttings <br />or other observations will be used to assure that the slurry wall <br />will be adequately keyed. Temporary slurry wall protection will be <br />required in the form of a noncompacted soil cover placed within <br />one day over each backfilled 100 foot reach. The temporary cover <br />is removed after settlement (approximately 2 weeks) and replaced <br />with a compacted clay cover over the completed slurry wall. <br />8. Post Construction Testing <br />Post construction testing will be conducted in accordance with the <br />"Colorado State Engineer's Office." <br />9. Above specifications (notes 1 -8) are provided as a general <br />guideline for permitting purposes. Final specifications and design <br />criteria will be developed during the final design of the slurry wall. <br />0 <br />oT: � <br />� 9 a <br />. � N N <br />oo 0 o <br />in <br />0 <br />15A X <br />NULL a <br />p > c <br />c <br />v N��� <br />N� <br />� m <br />M <br />`v <br />0 <br />am <br />X <br />W <br />E. <br />i. <br />d <br />X41 <br />'a <br />J m <br />J (L <br />w H <br />d a <br />d <br />i 3 <br />3 O <br />7 <br />C <br />a <br />c <br />0 <br />E <br />. co <br />(D <br />cc <br />a) <br />C <br />`w <br />Q <br />JCY 1 <br />Scale 1` _ <br />1Of: 1 <br />1 <br />