‘
w
Containment
Runt ( Yvonne) Cleanup and Crater
CAP CONSTRUCTION ©
the dome cap was designed to protect the mound of conta
and water. The POL
natural erosion by wind
aterial from
mesctibed
a nonload-bearing
surface of 18 inches of concrete
me strength characteristics as the keywall. Reinforcement
prescribed because the concrete was to be produced using salt wate
yecelerates corrosion of ferrous reinforcing materials. The final c
the cap sections was left to the USAE. In keeping with good eng
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practices, if was decided that each cap section should be as close t
as possible to minimize shrinkage cracking. The USAE decided
approximately 20-by-20-foot sections in the first ring, and contir
that size until the shape of the dome dictated a reduction in size
the square shape of the individual sections. Each cap section was
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adjacent sections using forming techniques. The POD design
expansion joint material only where the first ring joined the
(Figure 8-43). The rings were designated by the letters ‘‘A”’ throu
beginning at the keywall and extending up to the top of the dom
The first sections of the ‘‘A’’ ring were placed in May 1979, be
Donut Hole was filled and before final soil-cement operatio
completed (Figure 8-44). The initial 20-by-20-foot forms were f:
on site by the USAE using heavy lumber. The forms wereposit
survey and anchored with pins driven into the soil-cement surf.
forms were used on alternating cap sections. Intermediate
required an end form only. The forms were 18 inches deep and cor
4-by-4-inch tapered key (constructed using two 2-by-4-inch f£
jumber) located from 7 to Il inches from the bottom of the si
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(Figure 8-45).
As the capping operation progressed, the use of 18-inch steel fo
recommended. These were purchased by Field Command ai!
through the remainder of the project. The key on the steel fo
approximately the same size as on the wooden forms, but was cen
the bottom third of the form. End formsof heavy lumber still wer:
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conjunction with the steel forms.
Once the forms wereinstalled, the area within the form was br
grade. The surface was then raked smooth and covered with poly
sheets to prevent absorption of water from the concrete. The for
then lubricated to preclude their sticking to the concrete.
Concrete wasplaced directly from the transit-mix trucks (Figu
For rings ‘‘A’’ through ‘‘E,”’ the transit-mix truck was held in pl:
the winch cable from a dozer. This was necessary becauseof the |
steep slope of the lower dome and the deteriorating braking sy:
the trucks. Spreading and consolidation of the concrete was acco: