630
Opinion of the Court
standard was also included. In these circumstances it is enough that the choice to attain coherence by obviating constitutional problems is not "plainly contrary to the intent of Congress." DeBartolo, supra, at 575.
Because the statute as we construe it does not foreclose any factual issue from independent consideration by the arbitrator (the presumption is, again, assumed by all to be inapplicable to issues of law), there is no constitutional infirmity in it. For the same reason, that an employer may avail itself of independent review by the concededly neutral arbitrator, we find no derivative constitutional defect infecting the further presumption that a district court must afford to an arbitrator's findings of fact. See 29 U. S. C. § 1401(c).
d
Before applying the presumption to this case, one must recognize that in spite of Concrete Pipe's contention to the contrary, determining the date of "complete withdrawal" presents not a mere question of fact on which the arbitrator was required in the first instance to apply the § 1401(a)(3)(A) presumption, but a mixed question of fact and law. The relevant facts are about the closure of the Shafter plant (such as the intent of Concrete Pipe with respect to the plant, its expression of that intent, its activities while the plant was not operating, and the circumstances of the plant's reopening), while the question whether these facts amount to a "complete withdrawal" is one of law.
As to the truly factual issues, the arbitrator's decision fails to reveal the force with which factual conclusions by the trustees here were presumed correct, and in such a case we would ordinarily reverse the judgment below for consideration of the extent to which the arbitrator's application of the presumption was contrary to the construction we adopt today. But two reasons (urged upon us by neither party) persuade us not to take this course: the Plan's letter to Concrete Pipe contains no statement of facts justifying the trust-
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