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8015M cleanup standards and results on Table 4-2B by three orders of <br /> magnitude. <br /> 1.7 Figure 4-1. On Figure 4-1, DP0038 does not have an asterisk next to it. Based <br /> on the text on page 4-6, second paragraph, sample location DP0038 at SWMU <br /> 6 contains concentrations of trichlorophenoxyacetic acid(2,4,5-T) and dieldrin <br /> greater than soil cleanup standards. Based on the legend, the asterisk <br /> highlights locations where contaminants with concentrations greater than <br /> cleanup standards still exist at the site. Please add the asterisk to sample <br /> location DP0038. <br /> 1.8 Figure 4-2. There is a discrepancy between this figure and the photographs in <br /> Appendix D in representing the proximity of the excavation to Building 10. <br /> The figure shows the excavation at SWMU 20 stopping approximately three <br /> feet north of Building 10 and seven feet from the gas line on the west side of <br /> the building. Given this representation of the site, it is difficult to understand <br /> the statement on page 4-7 that further excavation in the vicinity of DP0047 <br /> could not be done without impacting site structures. However, the photographs <br /> in Appendix D, pages 7 and 8 of 16, appear to indicate that the excavation <br /> reached the north side of the building, exposed the building corner, and <br /> extended several feet along the west side of the building. Please revise Figure <br /> 4-2 to clearly represent that the excavation reached Building 10 or provide an <br /> explanation on page 4-7 of the apparent discrepancy between the figure and the <br /> photographs and explain how further excavation would impact site structures. <br /> 1.9 Figure 4-3. Based on the text on page 4-8, fourth paragraph, and Tables 4-2C <br /> and 5-1, sample location DP0102 at SWMU 27 contains concentrations of <br /> diesel and motor oil greater than soil cleanup standards. However, on Figure <br /> 4-1, DP0102 does not have an asterisk next to it. Please add the asterisk to <br /> sample location DP0102 and a note in the legend to denote that contaminants <br /> with concentrations greater than cleanup standards still exist at the site, as was <br /> done for the other figures. <br /> 1.10 Section 5.3, SWMU 27, last sentence. The text recommends no further <br /> action. However, residual contamination above ROD-specified soil cleanup <br /> standards remains at SWMU 27, and the text on page 4-8, fourth paragraph, <br /> states that remediation of residual soil contamination and groundwater at <br /> SWMU 27 is being investigated under the UST program. Since the residual <br /> contamination is petroleum hydrocarbons only, revise the recommendation to <br /> 3 <br />