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Item Paragraph Response <br /> program may be applicable for Stockton. <br /> We feel this would be a very cost ef- <br /> fective approach and would help focus <br /> any studies that may be considered for <br /> Stockton. Because our initial evalua- <br /> tion indicates off-site air contami- <br /> nant levels will be well below <br /> acceptable exposure levels we feel air <br /> monitoring is not a priority item. <br /> Task 16 1 We agree to defer the sampling issue <br /> Sewerline Integrity until the groundwater characterization <br /> Assessment is better defined. <br /> Task 2 1,2,3,4 We feel there is sufficient informa- <br /> Off-site tion to locate the next off-site wells. <br /> Wells We disagree with the DHS understanding <br /> of the groundwater data and assertion <br /> that more evaluation is needed before <br /> locating the next offsite wells. <br /> 5 Since the pump test data is conclusive, <br /> continuous coring will not be needed <br /> (as noted) . <br /> Task 3 1 We agree to discuss the groundwater <br /> Groundwater monitoring plan in the upcoming <br /> Monitoring technical meeting. <br /> 2 The objective of groundwater sampling <br /> is to collect data used to determine <br /> groundwater remediation alternatives. <br /> Pumping groundwater with a submersible <br /> pump is the best way to obtain chem- <br /> ical analysis representative of ground- <br /> water characteristics the remedial <br /> alternatives will need to treat. <br /> The objective of groundwater sampling <br /> is not to be a research study on <br /> sampling methods to ensure absolute <br /> in situ concentrations. <br /> We have agreed that when the zero <br /> concentration contour is determined, <br /> sampling will be by the best avail- <br /> able technology to support this <br /> conclusion. <br />