the east wall of tha blast structure. These cracks and all pipe areas were tarred on the outside. The special concrete for the mmna Stations consisted of the following for a quarter yard batch: . ● ✎ ● ● ✎ ● ● ● . . . . . . The scrap ixmn was all prebatched in 55 gallon drums which were handled from trailers to the mixer by crane. The limonite and the cement were hand dumped into the tier. TO insure complete mixing of the cemnt In the tier, it was necessary to spread the cement in a layer wer the limnite and add the scrap iron on top of it. The heavy iron pieces were not run through the mixer but were poured Into the crane kndled bucket simultaneously with the concrete as it came out of the tier. When the bucket was dumped over the forms, ths heavy iron pieces were distributed satisfactorily as the concrete fell through the reinforcing steel. Additional heavy Iron was hand placed under the slota throu~ holes in the bottoms of the slot forms. Based on experience at Runit and %gebi, some of the wall steel was left out around the dmr and hatch frams and around the.slots to provide more opening for the special concrete to flow under and around these obstructions. A one foot layer of the mix without nuts, bolts, . ●nd heavy iron was poured first. This was followed by another one foot layer of the regular mix without the heavy iron pieces. The removal of the inside forms and the slot forms of all the Gamma Buildings wes extremely difflcult because of the small interiors. 27 Section XVI