Not later than 90 days after a covered employee receives notice of the end of the period of mediation, but no sooner than 30 days after receipt of such notification, such covered employee may either— (1) file a complaint with the appropriate agency, as determined under section 454; or (2) file a civil action under section 1346(g) of title 28 . (Added Pub. L. 104–331, § 2(a) , Oct. 26, 1996 , 110 Stat. 4067 .)