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negotiated or insert text to explain that it might be possible. <br /> 69. Section 7.3 <br /> The title of this section includes injection as part of the description. However, the <br /> title does not reflect that percolation ponds are also a part of the alternative. <br /> Corrective Action: Add the use of percolation ponds to the description of the <br /> alternative. <br /> 70. Section 7.3.1.1.1 <br /> The text is very specific as to the number of wells and details regarding the remedial <br /> system. The text is inconsistent with the numbers presented in the FS. As a legally <br /> binding document, it may not be prudent to commit DDRW-Tracy to this level of <br /> detail prior to completion of the design of the remedy. <br /> Corrective Action: Compare these details with the information presented in the FS <br /> and revise as necessary. Include a sentence which reflects that these details are part <br /> of the conceptual design and numbers may have to be changed to optimize final <br /> design. <br /> 71. Section 7.3.1.1.3 <br /> The text regarding the disposal of treated groundwater needs to explain the process <br /> by which it has been decided to commit to an additional disposal mechanism (i.e., <br /> percolation ponds). The text which states "consideration is also being given to . . . <br /> surface impoundments" needs to be replaced with a definite statement of intent. <br /> Conversely, the suggestion that irrigation may also be an option should be deleted. <br /> Irrigation is not a part of this alternative. <br /> Corrective Action: Explain in this section that use of ponds was not evaluated in the <br /> OU-1 FS, however, based on public comment and a desire to have more than one <br /> means of disposal, DDRW-Tracy intends to also dispose of groundwater via use of <br /> ponds. Make the additional modifications to the text. <br /> 72. Section 7.3.2.2 <br /> This section, which discusses both aquifer cleanup standards and effluent treatment <br /> standards (which are sometimes confused) needs to carefully explain the differences <br /> to the reader. Further, the last sentence of this section seems to indicate erroneously <br /> that all ARARs are met. <br /> Corrective Action: Add more complete explanations of these ARARs. Delete the last <br /> sentence. <br /> 17/40 <br /> EPA/R9 lune 7, 1993 <br />