20. ‘The group discussed time frames and future meetings. It was agreed that 90 days appeared to be a reasonable target for obtaining data for the characterization. Data only for certification could be obtained during cleanup of Runit. The group would plan to meet agein, <% the call of the Chairman, after the characterization data is available. 21. RESSED The chair [ersseedthat the question of "plowing" to further homegonize Runit soil, thus reducing the “hot spot" concentrations. Mr. Yoder stated that cleanup experience so far indicates that we have had to go back repeatedly to cleanup to new, lower levels. Plowing will simply make such future cleanup more difficult and he strongly recommends against plowing. Further discussion indicated that weeicte plowing generally tends to lower average concentrations, and if the primary problem is air \resuspension, plowing may help. Bowever, in the specific case of Runit plowing might result in increasing surface levels by bringing subsurface contamination to the surface. This condition would be worse than doing nothing. It was generally agreed that plowing should not be used to meet cleans criteria, Zfter cleanup plowing may be considered to further reduce concentration in "hot" areas. However, if plowing is used, for any reason, it must be fully justified and defensible. Plowing should in all cases be kept shallow, on the order of six inches. 12