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2012-10-29_PERMIT FILE - M2012045 (6)
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2012-10-29_PERMIT FILE - M2012045 (6)
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Last modified
8/24/2016 5:09:54 PM
Creation date
10/31/2012 7:28:11 AM
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Template:
DRMS Permit Index
Permit No
M2012045
IBM Index Class Name
PERMIT FILE
Doc Date
10/29/2012
Doc Name
New 112c Application Submittal.
From
Stonewall Springs Quarry, LLC
To
DRMS
Media Type
D
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No
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properties of the freshly mixed slurry as to viscosity. Viscosity is related <br />to bentonite type, content and degree of hydration. Unless otherwise <br />indicated, the Applicant /Operator will specify the use of "standard" 90 <br />barrel yield bentonite as specified in API Publication 13A, Section 5. <br />• The addition of dry bentonite to the back fill will range from 0% to 3% as <br />dictated by site - specific design considerations. <br />• Only water of suitable quality will be used to mix with the slurry. <br />• The mixed bentonite slurry will be completely hydrated prior to <br />placement. <br />In- trench Slurry Properties: <br />• The density of the slurry in the trench must be at least 15 pounds per <br />cubic foot less than the density of the S -B backfill to displace the slurry in <br />the trench during backfilling. <br />• Controlling the in- trench slurry properties is important in constructing <br />and conducting a slurry wall operation. At minimum, standard in- trench <br />slurry test will be run twice per day, at least once in the morning and once <br />in the afternoon. <br />• Trench sedimentation will be dealt with by the contractor as experience <br />and site conditions dictate. <br />2. Soil - Bentonite Backfill: <br />• Mixing and Placing Soil - Bentonite Backfill: <br />• Soil - bentonite backfill will be mixed until "homogeneous" and achieves <br />a "slump" of 7 to 16 cm (2.75 to 6.31 inch) as measured using a slump <br />cone (ASTM D143). Mixing and placing will be done adjacent to the <br />trench using earthmoving equipment such as dozers and excavators. <br />• On -site soils will be used and /or amended to achieve a fines content of <br />at least 15 to 20%. <br />• Field Sampling of Soil - Bentonite Backfill: <br />• Grab samples of the soil - bentonite backfill will be obtained from the <br />work platform, placed in plastic bags, sealed and sent to the approved <br />laboratory for testing. Typically, one grab sample will be taken for <br />testing for every 400 to 1000 cubic meters of backfill. It is not <br />recommended to obtain grab samples in situ from the backfilled <br />trench; none will be obtained in situ. <br />• The Applicant /Operator agrees to have preformed those laboratory <br />tests considered customary and appropriate for a soil - bentonite <br />backfill. <br />• Construction Considerations: <br />• In the design specifications, the key -way will be specified to a <br />minimum depth or to refusal of the trench excavating equipment, <br />whichever is less. According to drill logs, the bedrock is claystone <br />bedrock that is hard to very hard. <br />• Joining slurry wall corners and closure of the "loop" will be done using <br />survey control to ensure that lapping of wall segments does not occur. <br />Where slurry walls meet at an angle or straight on, excavation will <br />proceed at a minimum of 5 feet past the meet point as surveyed at the <br />bottom of the trench. <br />• Cleaning of sediment from the trench bottom appears to be <br />controversial, based on available literature. This item will be discussed <br />
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