2020-05-11_REVISION - M2008017 (6)

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BACKFILL EXISTING TRENCH WITH NATIVE MATERIALS ..................... VARIES f J J a YP/PV ratio API Std. 13A less than 3 LL - 1.5' TYP. W 0 SANDY CLAY Test results for each lot of bentonite must be provided. 2. Water Specifications z pH 6-8 OVERBURDEN 3,�5, Z Z mI VARIES Z . VARIES ASTM C33-7 3. Bentonite Slurry General Specifications D . . . . . . . . . . . . . . . . . . . . . . CONCRETE mixed and hydrated in slurry hydration ponds. In general, a . . . . . . . . . . . . . . . . . . . AGGREGATE . the slurry by weight is required. 4. lY W J Q than 40 sec D_ w V) 3: FT 50 FTS{ pH 6.5 to 10 ° GRADE (MIN) 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 Q 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 ASTM C33 replaced with fresh slurry. The slurry level must be maintained at a. 1b 2 feet below the top of the working platform. CONCRETE SAND Bentonite Slurry Testing Specifications after Placement Unit Weight 1.03 to 1.40 gm/cm3 4720 rr (IF REQUIRED)d volume VAIES Soil—Bentonite Backfill Specifications S—B backfill slump ASTM C 143 1 set per 100 cu. yds. 4700 Slump 2-6 inches ...� .. a. 4. S—B backfill gradation 1 set per 300 cu. yds. 4.0' . 3 inch 100 ° a:d a. # 4 40-80 0 SAND AND GRAVEL #200 20-40 d ° Minimum Plasticity Index of 10 4660 ALLUVIUM 7. Key Trench and Slurry Wall Cap Specifications a During excavation, soundings should be obtained to determine the elevations of the top of the key layer, the bottom of the c0 ,� lip - Oq � 05' 00 O — � N 1.5 da. �(TYP.). �. d :. (TYP.) cD W C0 co CO c0 tf) co C0 co �� TYP. Q0 (.4 (0 co C0 co It 0) r U-) co C0 W �� N r` q- O C0 co U-) !`-� N co C0 co O r` 00 C0 co 0 0 Ln co � O U) 1q- 4600 3' ,t �r is removed after settlement (approximately 2 weeks) and replaced with a compacted clay cover over the completed slurry wall. 8. Post Construction Testing 4580 4' PERIMETER DRAIN DETAIL (TYPICAL SECTION IF REQUIRED) 4720 4700 4660 4640 4620 4600 0+00 0+50 1+00 1+50 2+00 2+50 3+00 Slope - W -E 4720 4720 4700 4700 4680 4680 4660 4660 4640 4640 4620 4620 4600 4600 4580 VARIES Bentonite Specifications J J a YP/PV ratio API Std. 13A less than 3 LL - Filtrate Loss less than 15 cm3 W 0 J Test results for each lot of bentonite must be provided. 2. Water Specifications z pH 6-8 Hardness less than 200 ppm Z Z mI VARIES Z � Chloride report 3. Bentonite Slurry General Specifications D 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 J U) J the slurry by weight is required. 4. lY W J Q than 40 sec D_ w V) 3: FT 50 FTS{ pH 6.5 to 10 GRADE �50 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 Q 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 1b 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 4720 rr volume PROPOSED Soil—Bentonite Backfill Specifications S—B backfill slump ASTM C 143 1 set per 100 cu. yds. 4700 Slump 2-6 inches S—B backfill gradation 1 set per 300 cu. yds. GRADE Screen (US Standard) Percent by Dry Weight 3 inch 100 4680 # 4 40-80 0 rr #200 20-40 Minimum Plasticity Index of 10 4660 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 c0 ,� c0 Lq Oq � U) rn 00 O — � N !`,� ,n trench bottom should be cleaned, as a minimum, at the beginning N co CO co cD W C0 co CO c0 tf) co C0 co �� U) Q0 (0 co C0 co �� Q0 (.4 (0 co C0 co It 0) r U-) co C0 W �� N r` q- O C0 co U-) !`-� N co C0 co O r` 00 C0 co 0 0 Ln co � O U) 1q- 4600 � ,t �r is removed after settlement (approximately 2 weeks) and replaced with a compacted clay cover over the completed slurry wall. 8. Post Construction Testing 4580 Post construction testing will be conducted in accordance with the "Colorado State Engineer's Office." 25 FT 9. Above specifications (notes 1-8) are provided as a general LO guideline for permitting purposes. Final specifications and design EXISTING 50 FT 50 FT GRADE RESERVOIR v' O. PROPOSED GRADE � I� N M LO N r- o, c0 — 0 ,d-Cq 0 N1`,� c0 N O O 0 0 0 0 (0 N rM rn r- r, N n0 N O 0 I` o M U) 0 0(D (0 Ln 0( 0 U-) ;I- N 0+00 0+50 1+00 1+50 2+00 2+50 3+00 Slope - W -E 4720 4720 4700 4700 4680 4680 4660 4660 4640 4640 4620 4620 4600 4600 4580 %\ NATIVE `MATERIAL OVERBURDEN AND TOPSOIL BACKFILL ALL DISTURBED AREAS DOWN TO WATER SURFACE WATER SURFACE ... TYPICAL BACKFILL SECTION N.T.S. VARIES Bentonite Specifications J J a YP/PV ratio API Std. 13A less than 3 LL - Filtrate Loss less than 15 cm3 0 JT -Derr Test results for each lot of bentonite must be provided. 2. Water Specifications z pH 6-8 Hardness less than 200 ppm Z Z mI VARIES J � Chloride report 3. Bentonite Slurry General Specifications D 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 J U) J the slurry by weight is required. 4. lY W J Q than 40 sec D_ w V) 3: FT 50 FTS{ %\ NATIVE `MATERIAL OVERBURDEN AND TOPSOIL BACKFILL ALL DISTURBED AREAS DOWN TO WATER SURFACE WATER SURFACE ... TYPICAL BACKFILL SECTION N.T.S. 3+50 4+00 4+50 5+00 0+00 0+50 1+00 1+50 2+00 2+50 3+00 Slope - S -N SLURRY WALL MOTES: 1. Bentonite Specifications J J a 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 JT -Derr Test results for each lot of bentonite must be provided. 2. Water Specifications 3J3 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 D 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 J U) the slurry by weight is required. 4. Bentonite Slurry Testing Specifications before Placement Viscosity Measured w/ Marsh Funnel (API RP 1313-1) less than 40 sec Density less than 64 pcf EXISTING FT 50 FTS{ pH 6.5 to 10 GRADE �50 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 1b 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 4720 Sand Content ASTM D 4381-84(1993)e10 to 20 percent by volume PROPOSED Soil—Bentonite Backfill Specifications S—B backfill slump ASTM C 143 1 set per 100 cu. yds. 4700 Slump 2-6 inches S—B backfill gradation 1 set per 300 cu. yds. GRADE Screen (US Standard) Percent by Dry Weight 3 inch 100 4680 # 4 40-80 #40 25-60 #200 20-40 Minimum Plasticity Index of 10 4660 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 c0 ,� c0 Lq Oq � U) rn 00 O — � N !`,� ,n trench bottom should be cleaned, as a minimum, at the beginning N co CO co cD W C0 co CO c0 tf) co C0 co �� U) Q0 (0 co C0 co �� Q0 (.4 (0 co C0 co It 0) r U-) co C0 W �� N r` q- O C0 co U-) !`-� N co C0 co O r` 00 C0 co 0 0 Ln co � � or other observations will be used to assure that the slurry wall 1q- 4600 � ,t �r 3+50 4+00 4+50 5+00 0+00 0+50 1+00 1+50 2+00 2+50 3+00 Slope - S -N SLURRY WALL MOTES: 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 JT -Derr Test results for each lot of bentonite must be provided. 2. Water Specifications 3J3 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 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 4720 Sand Content ASTM D 4381-84(1993)e10 to 20 percent by volume 6. Soil—Bentonite Backfill Specifications S—B backfill slump ASTM C 143 1 set per 100 cu. yds. 4700 Slump 2-6 inches S—B backfill gradation 1 set per 300 cu. yds. Screen (US Standard) Percent by Dry Weight 3 inch 100 4680 # 4 40-80 #40 25-60 #200 20-40 Minimum Plasticity Index of 10 4660 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 4640 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. 4620 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 4600 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 4580 Post construction testing will be conducted in accordance with the "Colorado State Engineer's Office." N 9. Above specifications (notes 1-8) are provided as a general LO guideline for permitting purposes. Final specifications and design criteria will be developed during the final design of the slurry wall. 3+50 4+00 4+50 5+00 IL YI�I� U � � m Cn a - IZJ- Q N N (9 CON L0 00 O U M O X a' U LL Q p cc -'14 o L C J r� (3) 8� 0 O M Lr) Li_ O O M U) N Z c� U) N O c� _Cz U N rr J&T Consulting, Inc. e• ?�,� Job # Date Drawn B Designed B Checked B File JT -Derr Scale Sheet: 3J3