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cost/benefit option?" implies that the lowest cost option should be considered. So, if <br /> shutdown is the least costly, then the well should be shut down and monitored for rebound. <br /> Conversely, if shutdown is more costly, then an alternative action is implemented. <br /> However, it appears that neither possibility allows for continued groundwater extraction, <br /> which may be the least expensive option. As currently presented,the two options are to <br /> shut down the well or to implement an alternative action. Since the plume would not be <br /> captured if the well is shut down (top right decision diamond),continuing groundwater <br /> extraction, which was evaluated int the previous step, should remain an option. Since it <br /> appears that there should be three possible outcomes,the solution is probably to break this <br /> decision into two separate decisions, one about cost and one about benefit. Please revise <br /> the quoted decision to allow for continued groundwater extraction, shutting down the well, <br /> or for implementing an alternative action. Please provide paths that clearly lead to each <br /> option. <br /> Alternatively, the decision question, "Is shutdown the lowest cost/benefit option?" and/or <br /> paths leading from this decision may be incorrect. If the intent was that the well should be <br /> shut down and an alternative action be implemented (the yes alternative) or that <br /> groundwater extraction continue from the well (the no alternative), diagram should be <br /> revised to reflect these possibilities. <br /> 2 <br />