At such time as the possibility of {TAIL ~ utilization} of some of the wastes disposed of in this fashion becomes more realistic and feasible, the waste disposal facility can be operated so that container tiering and stacking is carried out during certain hours of {HEAD ~ the day}, and retrieval of containers holding useful waste material can be carried out at other hours 
At such time as the possibility of { TAIL ~ utilization } of some of the wastes disposed of in this fashion becomes more realistic and feasible , the waste disposal facility can be operated so that container tiering and stacking is carried out during certain hours of { HEAD ~ the day } , and retrieval of containers holding useful waste material can be carried out at other hours
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