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cleanup standards. This comment also applies to a similar discussion for SWMU 20 on page 4-7. 2. Section 4.3.2,page 4-6,sixth paragraph,fourth sentence. The results for the DP0093 and DP0094 are presented in ug/kg,but it appears the units should be ug/L, as shown on the sample results table for SWMU 6(Table 4-2A). Please correct the units in the text. 3. Section 4.3.2,page 4-8,second paragraph. This sentence presents DP0096 twice, first as a sidewall sample and then as a bottom sample. Please revise the sentence to present the correct sample numbers for sidewall and bottom samples. 4. Table 3-1. The table shows no ROD-specified groundwater concentrations requiring evaluation for tetrachloroethene(PCE),ethylbenzene,trichloroethene (TCE), or xylenes at SWMU 20. However,the ROD(page 9-18)specifies concentrations for these compounds ranging from 2 ug/L to 29 ug/L. In addition,the TCE concentration for SWMU 27 is presented as 23 ug/L on Table 3-1 but is 2.3 ug/L in the ROD. Please correct Table 3-1 to present correct concentrations. 5. ' Table 4-2B. The table incorrectly lists the groundwater concentrations requiring evaluation(50)as soil cleanup standards for 2,4-dinitrophenol and pentachlorophenol. Revise the soil cleanup standard row of the table to contain the correct soil cleanup standards (830)for these two compounds. 6. Table 4-2B. The units for all methods appear to be the same,but the cleanup standards and results for EPA Method 8015M are three orders of magnitude too low. Please specify on the table that the units for EPA Method 8015M are mg/kg, as was done for the other tables, or increase all the EPA Method 8015M cleanup standards and results on Table 4-2B by three orders of magnitude. 7. Figure 4.1. On Figure 4-1,DP0038 does not have an asterisk next to it. Based on the text on page 4-6, second paragraph, sample location DP0038 at SWMU 6 contains concentrations of trichlorophenoxyacetic acid(2,4,5-T)and dieldrin greater than soil cleanup standards. Based on the legend,the asterisk highlights locations where contaminants with concentrations greater than cleanup standards still exist at the site. Please add the asterisk to sample location DP0038. 8. Figure 4-2. There is a discrepancy between this figure and the photographs in Appendix D in representing the proximity of the excavation to Building 10. The figure shows the excavation at SWMU 20 stopping approximately three feet north of Building 10 and seven feet from the gas line on the west side of the building. Given this representation of the site, it is difficult to understand the statement on page 4-7 that further excavation in the vicinity of DP0047 could not be done without impacting site structures. However,the photographs in Appendix D,pages 7 and 8 of 16,appear 2