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EAGLE SUPPLY AND MANUFACTURING, L.P.,
Plaintiff-Appellee,
v.
BECHTEL JACOBS COMPANY, LLC,
Defendant-Appellant.
   No. 16-6428
Appeal from the United States District Court
for the Eastern District of Tennessee at Knoxville.
No. 3:10-cv-00407—Pamela Lynn Reeves, District Judge.
Argued: August 3, 2017
Decided and Filed: August 17, 2017
Before: SUTTON, McKEAGUE, and THAPAR, Circuit Judges.


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OPINION
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THAPAR, Circuit Judge. During World War II, the United States launched the Manhattan Project—the military’s effort to build the world’s first atomic bomb. Building the bomb was a big project. Cleaning up afterward turned out to be a big one, too. Since the mid- 1980s, the Project’s original uranium-enrichment facilities in Oak Ridge, Tennessee, have been inactive, and the Department of Energy (“DOE”) has worked to clean up the hazardous waste left behind.

This case arises out of that cleanup. To manage its effort, DOE hired Bechtel Jacobs Company (“Bechtel”), a global engineering and construction firm. Bechtel, in turn, hired Eagle Supply & Manufacturing (“Eagle”) to help decontaminate the complex. Circumstances changed, and litigation ensued. Now, years after the work finished, Eagle and Bechtel continue to fight over the payment owed for Eagle’s work, over the meaning of certain contractual provisions, and even over what happened at the site. The district court found for Eagle, and Bechtel appealed. We now affirm the district court’s award of damages and attorney’s fees to Eagle, but remand so that the court can recalculate the interest to which Eagle is entitled under the Tennessee Prompt Pay Act.