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Appendix H- Detailed Description of Alternative 6: DoEIRI.-2oo1-11
I Close in Place - Collapsed Structure Rev. 10.rafso
Red litt S t 'kenu!
the degree of equipment volume reduction that is achievable, it is assumed that only this
contaminated equipment would be disposed in the 221-U cells. It is further assumed that
there may be equipment placement in cel13. which connect.c to the rail tunnel.
(-1-^j.L`The existing 0.6-m (24-in.)-diamcter cell drain header located beneath 221-U would be
grouted to immobilize contamination in this pipe.
^48:J^LA new ventilation system with replaceable high-efficiency particulate air (HEPA) filter
banks would be installed on the northeast end of the 221-U roof. It would replace the
existing ventilation tunnel and stack ventilation system.
49:I7Intemal void spaces essceiat . inside of 221-U would be filled with
grout and pressure grouted. Where large voids are grouted (such as oFeund the vaige
eentainers in the allgeries and inside the cells), a low-cement-content grout would be used.
This grout has a limited potential for heat buildup due to a low heat of hydration yet would
provide sufficient compressive strength for the intended service.
^20:J$.While sources for some materials required for construction of an environmental cap have
not yet been identified, it is assumed that sufficient quantities of materials necessary for the
clean fill and construction of the environmental cap are available locally.
24-.12.A modified Resource Conservation and Recovery Act of 1976 (RCRA) Subtitle C
engineered barrier would be placed over the 221-U Building and wherever demolished
building sections are placed outside of the footprint of 221-U. No liner would be placed
under the building wastes placed to the northwest of 221-U. The building sections (roof and
canyon wall sections) are not considered RCRA-type wastes and would be located under the
engineered barrier.
H.1 PREPARE EXISTING COMPLEX
This function provides for.the necessary programs, administrative and physical controls,
safeguards, and infrastructure to prepare the complex for subsequent operating and closing the
complex functions. The purpose of these activities is to establish a complex-wide configuration
designed to support wastepreeessing;decontamination, demolition, and closure.
11.1.1 Control Hazards
Preparing for Alternative 6 would include controlling hazards at the site. This control would
begin with preparation of a decommissioning plan. The plan would include, but not be limited
to, such things as readiness evaluations, hazard classifications, waste designation, a waste
Final Feasibility Srudyfor the Canyon Disposition Initiative (221•I! Facility)
]u x 2tlnl H-4