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Does the system described include the "D" zone? Why is this finding significant? The significance of this finding should be discussed in terms of its impacts on decision making. 6. Pg10-1. finding #7. "TCE is the dominant VOC in both soil and groundwater at SHAD." This statement is overly broad. There is insufficient evidence to conclude that TCE is the dominant contaminant in soils everywhere on the base. Because past investiga- tions have focused so much on TCE (e.g., the soil gas investigation virtually ignored other compounds) it is possible that the results of previous studies largely reflect a sampling bias rather than actual conditions. Significance, or dominance of any one contaminant, ,should be evaluated in terms of public health or environmental risk and the potential problems presented by the 'contaminant or suite of contaminants under a given remedial option (e.g., mixtures of compounds that may prevent or limit the use of a remedial technology). Have retardation effects been accounted for? 7. Pg. 10-1. finding #8. "The sources of VOCs on, SHAD are multiple and originate from several former disposal pits/trenches and/or spill areas. Thirteen separate source areas have been identified by the presence of contaminated soil and/or groundwater." It would be useful to identify the thirteen source areas in this finding. 8. Pg. 10-2, finding #9. "Eight distinct VOC groundwater plumes have been identified at SHAD. They are as follows: South Balloon Area, Well 441, Well 407, Wells 442 and 443, Runway Ponds, Firefighter Training Area, North Balloon Area TCE, and Well 413 TCLEE " Does this finding imply, when combined with that of finding #8, that five of the thirteen source areas indicated in #8 affect only soil? Or does it imply that several a source areas contribute to a single groundwater plume?, Can individual source areas within the South and North Balloon be separately identified? What are the implica- tions for soil cleanup?