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extents of TCE plumes with concentrations above 5 ug/L are predicted to be substantially <br /> smaller after mass removal than they are without mass removal. Please resolve these <br /> apparent contradictions. <br /> 4. Section 3.1, Overview, Page 25: In Section 3.1.1 it is stated that the extraction system <br /> optimization consists of three steps; however, only two of the three steps appear to be <br /> discussed. The first step is to operate only 15 wells for plume containment and the <br /> second step appears to be rerouting the conveyance lines, shutting down two of the three . <br /> groundwater treatment plants, and discharging treated groundwater to percolation ponds. <br /> The text does not discuss a third step. Please discuss or make clearer the third step or <br /> revise the stated number of steps for extraction system optimization. <br /> MINOR COMMENTS <br /> 1. Section 1.2,Introduction, Page 2: The first sentence states the incorrect number of <br /> continued operational extraction wells that would result in a high lifecycle costs if the <br /> number of extraction wells were not reduced. The text states three extraction wells and <br /> three treatment plants would result in a high lifecycle cost;however, there are currently <br /> many more operational extraction wells at Defense Distribution Depot San Joaquin <br /> California(DDJC)-Sharpe. Please state the correct number of operational extraction <br /> wells that are currently at DDJC-Sharpe in the first sentence of Section 1.2. <br /> 2. Figures 2-9, TCE Plume in Layer 3, Scenario 28, 15 Extraction Wells Operating and <br /> Figure 2-10,TCE Plume in Layer 4, Scenario 28, 15 Extraction Wells Operating, <br /> Pages 21 and 23: On Figures 2-9 and 2-10, it appears that there is a section missing in <br /> the middle of the central plumes of the initial conditions for layers 3 and 4. In both <br /> figures there is a square in the center of the plume that shows a clear window to the base <br /> map, however, it is assumed that this depiction is incorrect and that the figures are <br /> missing the center portion of the TCE plumes for layers 3 and 4. Please correct Figure 2- <br /> 9'and 2-10 to show the correct initial conditions of the TCE plumes for layers 3 and 4. <br /> 2 <br />