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Memorandum <br /> Megan Cambridge <br /> 24 July 2000 <br /> Page 2 <br /> You indicated that DTSC requires the collection of an additional sample at the GW#3 location <br /> to determine the soluble lead concentration present in the underlying groundwater and whether <br /> it could potentially be a source for groundwater quality degradation. Therefore, a grab <br /> groundwater sample will be collected within the vicinity of GW#3. The grab groundwater <br /> sample will be placed in an unpreserved sample container, then filtered by a_State-certified <br /> laboratory and analyzed for total lead. A summary of sampling efforts and analytical results <br /> will be submitted.to you within three weeks of sampling. <br /> Additional Assessment of Surface Water and Sediments and Channel Water Use Impact <br /> Evaluation <br /> You reconfirmed that the City of Stockton can conduct the additional assessment of surface <br /> water and sediments and channel water use impact evaluation(5`h and 7th bullets of condition <br /> of approval Ietter)as part of the separate water quality engineering.study of the channel water <br /> being funded through a U.S. EPA grant. <br /> Supplemental Risk Assessment <br /> As you indicated,the supplemental human health risk assessment(first bullet of condition of <br /> approval letter) may be prepared using the same approach applied in the March 2000 PEA. # <br /> Risk management measures would be developed to address risks, if any, identified in the <br /> supplemental risk assessment. The risk management. measures would be iincluded in the <br /> supplemental risk assessment. <br /> Please contact me if you have any questions of comments. I can be reached either by-telephone at I <br /> (510) 420-8686 or via electronic mail at rhodora@baseline-env.com. It <br /> 4 <br /> Y0310mem.724.wpd-7/24/00 <br />