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# Comment Response to Comment <br /> 3g For the groundwater plume at IAS-13 and IAS-14, additional Additional grab-groundwater samples will be collected in four <br /> horizontal (to the east and west)and vertical delineation are locations in this area, as requested in RWQCB comment 8. <br /> needed for the VOC plume. <br /> 3h At IAS-16, additional groundwater sampling beyond the two Grab-groundwater samples will be collected in two additional <br /> proposed locations is needed to delineate the horizontal and locations in this area,as requested. <br /> vertical extents of the plumes. Grab groundwater sample <br /> locations are also recommended to the east of the plume <br /> between P-138 and W-040 and north of the cis-1,2- <br /> dicholorethene plume, northwest of the former piezometer P- <br /> 133. <br /> 4 Radionuclides—Based on the information presented in the Groundwater samples collected from IAS-03/04 will be analyzed <br /> Constituents of Concern Evaluation Report(ie. Potential for radionuclides. <br /> disposal areas for material containing radium-226 and mixed <br /> fission products)and the Third Quarter 2018 Data Transmittal <br /> (ie. Gross alpha concentrations in groundwater that exceed the <br /> maximum contaminant level), it is recommended that the <br /> groundwater samples from IAS-03/04 be analyzed for <br /> radionuclides. <br /> 5 The text does not indicate what drilling technology and The sampling methodology is described in the 2018 GMWP, <br /> sampling methods will be used to collect the proposed grab Section 6.3.1 and Appendix J: Standard Operating Procedures for <br /> groundwater samples.As contamination is present at different Grab-Groundwater Sampling. <br /> depths, the concern is that some drilling methods are likely to <br /> cause cross-contamination. Please revise the Report to indicate <br /> what drilling technology will be used and how the groundwater <br /> samples will be collected. <br /> 6 Wells at IAS-ll —Although the installation of new monitoring As outlined in the 2018 GMWP, new monitoring wells will be <br /> wells is not currently proposed, all wells at IAS-I I are listed as proposed following the completion of the data gaps investigation. <br /> missing, damaged, or destroyed.New monitoring wells are <br /> needed to monitor and delineate VOCs in groundwater at this <br /> site. <br /> 4 08.03.2019 <br />