SITE INFORMATION AND CORRESPONDENCE_2004-2014

Home Browse Search

Mr. Marshall Cloud March 22, 2007 Page 4 Inspection Report for DDJC-Sharpe and submit the report as Appendix B of the Final 2006 Annual Progress Report to fulfill the Installation Master Plan and IC requirements. 13.) Figure 3.2-5, TCE Comparison Map; According to the figure, there are no TCE concentrations in ground water greater than 500 ppb at DDJC-Sharpe. This contradicts the data from the Hydropunch samples from Site P-5A which identified TCE in ground water at 1,350 ppb in the Central Area A-zone aquifer. The figure should have a note stating that the 2006 map doesn't account for the recent ground water investigations at Site P-5A. 14.) Figure 3.2-11; The lower 5 ppb isopleth near MW445 and MW497CD does not show the additional analytical data verifying the isopleths location. Please add the necessary analytical data to confirm the isopleth placement or remove the isopleth from the figure if no additional data exists. 15.) Figure 3.2-12; The TCE isopleth surrounding MW437 needs to be revised due to the 50 ppb isopleth running directly through the wells screen which produced TCE concentrations of slightly over 1 ppb. 16.) Figure 3.2-12; The 5 ppb isopleth surrounding MW509, EWCC3 needs to be redrawn around P10C to capture the 3Q05 concentration of 28 ppb. 17.) Figure 3.2-14; The time series plots for MW445C located in the South Balloon show a significant increasing trend for PCE. The increasing PCE trends for the MW445 cluster should be discussed in the section 3.2.4.9 of the final report. 18.) Figure 3.2-17; Both the 0.5 and 5ppb isopleths need to be identified for the wells on the D-D' cross-section from MW413 onward towards the northwest. 19.) Page 4-3, section 4.2.7, sixth sentence; Please indicate in the final report how the metric of a 40% reduction in present worth and operational costs of the treatment systems was determined to indicate a successful optimization effort.