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James T. Allen, Ph.D Page 3 July 31 , 1987 the facility, wells will be installed, as needed. There is no disagreement with the principle of Comment 9 , but plans cannot be made for the north boundary area until after the next round of wells has been installed. Comments 13 and 23 : McCormick & Baxter does not agree that second column confirmation is required for all samples with results above detection limits . This is not a cost-effective use of limited funds , potentially doubling the analysis costs of this program, especially since the major contaminants of concern have already been identified. McCormick & Baxter will analyze samples in accordance with the Title 22 and EPA approved procedures . In addition, selected samples will be analyzed using GC/MS confirmation methods as a quality as- surance check. These will be analyzed at a rate of not less than 10 percent of samples with detectable concentrations. Also, there remains money in the fund established by McCormick & Baxter for the state to use for confirmation analysis by the analytical method and laboratory of the state' s choice . Comment 16 : This comment is probably a moot point, since wells previously installed at McCormick & Baxter yield water that is not turbid. If turbid water is collected, it will be split into the appropriate sampling containers . Sample splits for organic analyses will not be filtered in the field. Sample splits for metals analysis will be field filtered, if turbid. This is required because the nitric acid preserva- tion of these sample splits will extract natural metals from the soil particles and give erroneously high results for the groundwater metals analysis . Comment 19 : McCormick & Baxter agrees with the stated objective of water quality monitoring. McCormick & Baxter agrees to increase monitoring in Well A-6 and DSW-4E to quarterly, and to increase monitoring in Well DSW-4C to monthly. The monitoring plan described in the revised workplan reflects these changes . McCormick & Baxter does not agree with the other monitoring changes , for the following reasons : o Wells OS-lE and OS-3E do not need to be monitored quarterly because : They are not downgradient of the onsite source area (the gradient in the E zone is east- northeast) .