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i i to indicate that the excavation reached the north side of the building,exposed the building comer, and extended several feet along the west side of the building. Please revise Figure 4-2 to clearly represent that the excavation reached Building 10 or provide an explanation on page 4-7 of the apparent discrepancy between the figure and the photographs and explain how further excavation would impact site structures. 9. Figure 4-3. Based on the text on page 4-8,fourth paragraph,and Tables 4-2C and 5- 1, sample location DP0102 at SWMU 27 contains concentrations of diesel and motor oil greater than soil cleanup standards. However, on Figure 4-1,DP0102 does not have an asterisk next to it. Please add the asterisk to sample location DP0102 and a note in the legend to denote that contaminants with concentrations greater than cleanup standards still exist at the site,as was done for the other figures. 10. Section 5.3,SWMU 27,last sentence. The text recommends no further action. However, residual contamination above ROD-specified soil cleanup standards remains at SWMU 27, and the text on page 4-8,fourth paragraph, states that remediation of residual soil contamination and groundwater at SWMU 27 is being investigated under the UST program. Since the residual contamination is petroleum hydrocarbons only,revise the recommendation to specify that no further action under CERCLA is recommended, but remediation is being investigated under the UST program. 11. Section 6.0,page 6-1,second paragraph. The text states that"confirmation sampling results at SWMUs 20 and 27 show COCs-impacted soil above ROD specified cleanup standards has been adequately removed...." However,the text in section 5.2,page 5-1,first paragraph after the bullets, states that"soil containing COC above cleanup standards still remains at SWMU 20". The text on page 4-8, fourth paragraph,discusses residual contamination at SWMU 27. Table 5-1 also shows that soil contamination still remains at SWMUs 20 and 27. The text on page 6-1 should discuss the soil contamination that still remains at SWMUs 20 and 27. Please add to section 6.0 a discussion of the soil contamination that still remains at SWMUs 20 and 27 znd what measures will be taken to address the remaining soil contamination. In addition, include a discussion of why only 305 cubic yards of soil were removed from SWMU 20, when the ROD estimated that 510 cubic yards of soil required removal. 3