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DOFIRL-2001-11<br />

Rev.61 Dr,U<br />

Re IinclStril.cout<br />

1 TABLE OF CONTENTS<br />

2<br />

3<br />

4 H DETAILED DESCRfPTION OF ALTERNATIVE 6: CLOSE IN PLACE-<br />

5 COLLAPSED STRUCTURE ....................................................................................... H-1<br />

i1.1<br />

H.2<br />

H.3<br />

H.4<br />

FIGURES<br />

H-1. Alternative 6: Cross Section of Environmental Cap ............................................. ...... H-25<br />

H-2. Alternative 6: Plan <strong>View</strong> of Environmental Cap ..........................................................H-26<br />

ATTACHMENT<br />

PREPARE EXISTING COMPLEX ....................................................................H-4<br />

H.1.1 Control Hazards....... ...............................................................................H-4<br />

H.1.2 Establish Infnastructtue ...................................................................._......H-7<br />

H.1.3 Modify Facility........._ ....................................................................._......H-8<br />

H.1.4 Modify External Area .......................................... .................................. H-13<br />

H.1.5 Manage Hazardous Materials ................................................................H-15<br />

OPERATE THE COMPLEX ............................................................................H-15<br />

H.2.1 Emplace Waste in 221-U Galleries .......................................................H-15<br />

H.2.2 Demolition of 221-U Building ......... _ ..................................................H-17<br />

CLOSE THE COMPLEX . .................... ....... .................................................... H-18<br />

H.3.1 Consttuct Environmental Cap ............................................... ................ H-19<br />

H.3.2 Revegetate <strong>Site</strong> ................. _................................................... ................ H-20<br />

H.33 Cleanup Complex ............. _............................... ................... _.............. H-20<br />

H.3.4 Sustain Post-Closure ........ ................................. _............................ .....H-21<br />

RF.FERENCES ............................................................... .................................. H-23<br />

HI FUNCTIONAL HIERARCHY ..................................................................................... H-27<br />

Finaf Feasibi[iry Study for the Canyon Disposition Atitiative (221-U Facility)<br />

u • 2tbl<br />

H-iii

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