_ The initial intensity levels of the panels were very low as the fall-out apparently followed a different path than that indicated by pre-test planning. tan Fall-out samples taken on the barge by other projects were algo very low in activity. The contamination remaining after decontanination by vigorous methocs was very high and varied from L1% to 98£€ depending on the nature of the construction surface. The two most useful methods of decontamination, hosing and scrubbing, were applied to the panels. No further effort was cractical, because the residual contamination after application of these methods was very low, dus mainly to the combined effects of low initial contamination and decay. Conclusions The contaxination resulting from this datonation is of a very tenactous nature and is more difficult to re-ove than the contamination encountered after the bsp A difference exists among the construction surfaces in regard to initial Contanrination levels and ease of removal. However, the marked difference in ore Contanination levels between vertical and horizontal or stanad ortaces MEE > ; : Batwa ee toned “S59 - an - ’i