transfer parameter for Pu. We are continually assessing the models, and the key parameter in the models, aS more research data become available. If new data indicate that predicted Pu doses should be revised we will immediately re-evaluate Pu doses via the marine and terrestrial foodchains at Enewetak. The question to which this response is directed concerned the impact of Pu upon the marine environmental as a result of disposal of contaminated soil near Cactus Crater. have directed our assessment at the Pu question. Therefore we However, it should be recognized that other radionuclides are also present in the soil and that °°Sr, ?37Cs and ?*!Am, for example, will also be remobilized at rates very different from those discussed for plutonium. The leaching and remobilization of radionuclides from the contaminated soil which have been discussed above are based upon data obtained with current water flow patterns across the reef and in and out of Cactus Crater. The impact of altering water circulation patterns across the reef and around the entire northern end of Runit Island resulting from filling the crater and mounding soil and concrete to heights of 30 feet, is unknown. It is recognized that it will be necessary to establish a water monitoring system to detect any unanticipated problems which could impact on the marine environment from the soil fill. It