[en] The initial estimate of the expected Cs-137 transport in Steel Creek following L Reactor restart as presented in the Environmental Assessment, was based on historical data. To improve these estimates of Cs-137 remobilization in the Steel Creek system, Cs-137 transport studies were made during the L-Reactor pumping tests of ambient water in February to April 1982. Based on data from measurements conducted during the L-Reactor pump tests of March 1982, the suspended sediment-water transport during the first year will be only 2.3 +- 1.8 Ci/y. Values for the other two components of the transport estimate (hot water desorption and biota loss) remain unchanged. The reassessmant will reduce the estimated ten year release from 41 to 14.4 Ci