2019-03-27_REVISION - M2008080 (4)

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zoo ioo 0 200 400 soo SCALE IN FEET 4 PERMIT BOUNDARY EXISTING GROUND * DISTANCE VARIES BACKFILL EXISTING TRENCH WITH NATIVE MATERIALS 1.5' TYP. SANDY CLAY . . . . . . OVERBURDEN VARIES . . ASTM. C33-7@ " CONCRETE, . . . . . . . . . AGGREGATE . . . . . . . . . . . . . . . .. .a. a •r ,s. •..ate . . . . . .. d. �.. d +4` ; ' d (MIN) . . . . . . . . . . . . . . . ASTM C33 a d CONCRETE SAND d dd (IF REQUIRE) VAtIES d • 4. A 'd 4.0' . . SAND AND GRAVEL Cd a s ® d ALLUVIUM r. .. ad - . .o:�*' a, .05'% r TYP. TYP. C ).'A. _ _ .. (TYP.) : d . 3' 4' PERIMETER DRAIN DETAIL (TYPICAL SECTION IF REQUIRED N.T.S. PERIMETER DRAIN LOCATION (IF REQUIRED) OUTLET FACILITY 12.5' OVERBURDEN AND TOPSOIL BACKFILL ALL DISTURBED AREAS DOWN TO WATER SURFACEF VARIES ... ... ... = 4591 SLURRY WALL " SAND AND GRAVEol L : � . -.-: • _: ' _ 31 S�0pF 110, loo X0 //,B�DkOCK/ /3 4* 00 10 X0, TYPICAL BACKFILL SECTION N.T.S. SLURRY WALL NOTES0 : 1. Bentonite Specifications 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 T,� esting Specifications before Placement Viscosity Measured w/ Marsh Funnel (API RP 1313-1) 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 1 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 desanding 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. Bentonite 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 3YA AEGEND0, RECEIVED X UTILITY Pow MAR 2 7 2019 } GUY WIRE G DMSION OF RECLAMATION GAS LINE MARKER MINNGANDSAFETY GAS VALVE WELL WATER METER WATER FAUCET W WATER LINE MARKER ®► ELECTRIC TRANSFORMER • TREE TELEPHONE PEDESTAL T 4 TELEPHONE LINE MARKER PROPERTY LINE FENCE LINE —GE aE OVERHEAD ELECTRIC LINE EXISTING DUKE GAS am Or UNDERGROUND WATER LINE �. ® e — �` EXISTING CONTOURS (2' INTERVALS) GRAVEL ROAD �� ■� �� PROPOSED PERMIT BOUNDARY SLURRY WALL 4fi40 PROPOSED CONTOURS 10' 25' OFFSET SLURRY WALL PERIMETER DRAIN DITCH BOTTOM OF DITCH BANK SLOPE SOUTH BRANCH PLUMB DITCH OFFSET DETAIL N.T.S. 6. Soil—Bentonite Backfill Specifications 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 Cap 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. PostConstruction 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. n ■M X la N� 'N o N opo o a) M 0 X c' a LL > L e <C 2 Lo a U 0Co� c. E ' ` 1 �J`j• C5 J`3 0 m C) n- 0- cu az a - O c[i E Cz U (U it 0 co 0 cc0 0 N J&T Consulting, Inc. C. Job # 07113 Date 9/15/08 Drawn By WSS Designed By TPY Checked By JCY File JT -Reclamation Scale 1" = 200'11 Sheet: or: 1 ,