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• <br /> 20. Page 4-4, Section 4.3.3.7.1 <br /> The Region IX PRG for tetra chloroethene (PCE) in soils is 65 ug/kg; the listed <br /> detection limit for PCE in soils is 200 ug/kg. <br /> • Please explain this discrepancy in the text. <br /> Also, for 1,1,-DCE and vinyl chloride, state in the text the risk associated with <br /> detection limits using Method 8240 and using Method 8010/8020. <br /> 21. Page 4-5, Section 4.3.3.8.1 and Section 4.3.3.9.1 <br /> Include information on the Cal-EPA-DTSC method for ethylene dibromide and <br /> tetraethyl lead, in this section. <br /> 22. Page 4-6, Section 4.3.3.9.3 <br /> All dioxin samples must be analyzed by Method 8290 because dioxin sampling is only <br /> proposed for areas highly suspected to have dioxin contamination (i.e., burn pits). <br /> • Delete this section. <br /> 23. Page 4-7, Section 4.7.1.5 <br /> The discussion of exposure pathways references Figure 4.5-1. However, it is not <br /> clear if this figure a generic version of a conceptual site model. <br /> • If this is a generic version of a conceptual site model, it should be presented <br /> in this BRA amendment. <br /> 24. Page 4-7, Section 4.7.1.5, Bullet 1 <br /> The human and ecological pathways should include groundwater as a medium of <br /> concern. <br /> 25. Page 4-7, Section 4.8 <br /> Explain in the text how the chemical concentration estimates will be calculated for <br /> the BRA. <br /> Z6. Page 4-7, Section 4.8 <br /> Explain in the text how chemicals of concern be selected. <br /> 27. Page 4-7, Section 4.8.1 <br /> Include a discussion of what constitutes a complete exposure pathway. <br /> USEPA/R9 12 Apr 93 7/19 <br />