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2008-01-08_PERMIT FILE - M2008001 (9)
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2008-01-08_PERMIT FILE - M2008001 (9)
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Last modified
8/24/2016 3:20:45 PM
Creation date
1/11/2008 9:47:44 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M2008001
IBM Index Class Name
PERMIT FILE
Doc Date
1/8/2008
Doc Name
Reclamation Plan
From
Southwest Farms
To
DRMS
Section_Exhibit Name
Exhibit E
Media Type
D
Archive
No
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• The density of the slurry in the trench must be at least 15 pounds per cubic foot <br />less than the density of the S-B backfill to displace the slurry in the trench during <br />backfilling. <br />Controlling the in-trench slurry properties are important in constructing and <br />conducting a slurry wall operation. At minimum, standard in-trench slurry test <br />will be run twice per day, at least once in the morning and once in the afternoon. <br />• Trench sedimentation will be dealt with by the contractor as experience and site <br />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 a <br />"slump" of 7 to 16 cm (2.75 to 6.31 inch) as measured using a slump cone <br />(ASTM D143). Mixing and placing will be done adjacent to the trench using <br />earthmoving equipment such as dozers and excavators. <br />On-site soils will be used andlor amended to achieve a fines content of at <br />least 15 to 20%. <br />• Field Sampling of Soil-Bentonite Backfill: <br />• Grab samples of the soil-Bentonite backfill will be obtained from the work <br />platform, placed in plastic bags, sealed and sent to the approved laboratory for <br />testing. Typically, one grab sample will be taken for testing for every 400 to 1000 <br />cubic meters of backfill. It is not recommended to obtain grab samples in situ <br />from the backfilled trench; none will be obtained in situ. <br />• The ApplicantJOperator agrees to have preformed those laboratory tests <br />considered customary and appropriate for asoil-Bentonite backfill. <br />• Construction Considerations: <br />• In the design specifications, the key-way will be specified to a minimum <br />depth or to refusal of the trench excavating equipment, whichever is less. <br />According to drill logs the bedrock is claystone 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. Where <br />slurry walls meet at an angle or straight on, excavation will proceed at a minimum <br />of 5 feet past the meet point as surveyed at the bottom of the trench. <br />
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