or a negligible quantity, further epidemiologic study would be vain-~ There are other, less tangible, elements. Our principal collaborator and his agency are interested in the health of the residents; our counsel is sought on matters related to health and the study of health; and continuing discussion within the project has pursued the question of health for a long time. Considering the whole background, my recommendation is to maintain and build upon the PROPOSAL with certain modi-~ fications and phasing adjustments detailed below. Specific Recommendations The PROPOSAL, I feel, is solidly based on and long-term realities of the situation. are than for a the background Recommendations series of minor adjustments or improvements rather any fundamental change. study be divided in two parts, To begin with, I suggest as follows. l. A study of uptake and retention as manifested by representative members of population groups potentially exposed. 2. A study of health effects in two phases: a) a planning study to start now; b) the actual and if, investigation to start when, significant levels are established in part l. qu 5008829 the