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7 .3 . 1, the selected remedy for VOC contamination in <br /> groundwater was reevaluated and determined to be the most <br /> viable remedy. As result, Remedial Action Objectives in <br /> this ROD address the only remaining chemical of concern in <br /> groundwater, which is dieldrin. " <br /> b. Similarly, Section 7 .3 .3 (Remedial Alternatives) should <br /> explain why remedial alternatives for groundwater are <br /> limited to dieldrin. For example, Section 7 .3 .3 could state <br /> "Remedial alternatives for groundwater contamination in this <br /> ROD are limited to modifications to the existing OU-1 remedy <br /> to address dieldrin contamination. Remedial alternatives <br /> have not been developed for VOC contamination in groundwater <br /> because a reevaluation of existing OU-1 alternatives, as <br /> presented in Section 7.3 . 1, confirms that the selected <br /> remedy for VOC contamination is still preferred. " <br /> C. Section 8.2 . 1.1 (Comparative Analysis of Alternatives) also <br /> provides discussion of why remedial alternatives for <br /> groundwater in this ROD only address dieldrin. However, to <br /> avoid redundancy which could become confusing, it may be <br /> best to move most of the text in Section 8 .2 . 1 . 1 to Section <br /> 7.3 . 3 . Then, Section 8 .2 . 1. 1 could refer the reader to <br /> Section 7 .3 .3 for an explanation of why remedial <br /> alternatives for OU-1 groundwater in this ROD only address <br /> dieldrin and not VOC contamination. <br /> d. In Section 9.3 (Selected Remedy for OU-1 Groundwater) , the <br /> first paragraph should briefly summarize the overall <br /> selected remedy for groundwater (VOCs and dieldrin) to be to <br /> consistent with the description of all other selected <br /> remedies in Section 9. <br /> DETAILED COMMENTS <br /> 5 . [Table D-2; Section 9.7 .1. 13] Table D-2 in the Declaration <br /> indicates the estimated volume of soil to be excavated for SWMU 4 <br /> is 4, 000 cubic yards, while Section 9.7. 1. 1.3 indicates that <br /> volume is 2, 500 cubic yards . Please resolve. <br /> ADDITIONAL GENERAL COMMENTS <br /> 6 . [Response to EPA Comment No. G7 of October 15, 1997 on Future <br /> Threats to Groundwater; Section 9. 1.2, page 9-1, and Table 9-2 , <br /> Performance Monitoring Network] The response to this concern <br /> A-4 <br />