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j <br /> y <br /> procedures utilized during sample collection, handling and preservation. There was a.consensus <br /> that the lead may be coming out of the sediment present in the samples at the time:of collection , <br /> and acidification. The laboratory personnel suggested resampling and handling the samples <br /> differently to see if the handling and preservation procedures followed by SRK were affecting <br /> the test results.;Park agrees with this suggestion. <br /> Recommendations <br /> Park recommends that another round of sampling be performed, and that three saiinples be . <br /> collected from each well. These sets of samples would be handled in the following manner. One,; <br /> set of samples would not be acidified at all. This set would be placed into a sample container and ! <br /> refrigerated only. The second set of samples would be acidified without filtering.iAnd the third g <br /> set would be filtered before acidification. All three sets of samples would then be analyzed for <br /> total lead using'�the same laboratory testing method. In addition, the filter paper will be digested <br /> and also analyzed for lead to provide a confirmation that the lead is coming from the sediment <br /> and not from th'e water. Review of the analytical test results should resolve the issue of whether <br /> the lead is actually present in the water sample or being introduced during collection and <br /> preservation of the samples. <br /> Proposal <br /> Park will perform the following tasks at the Diamond Lumber Store site in.Lodi, California: <br /> ♦ Purge aid sample groundwater from-the three groundwater;monitoring wells on site <br /> i <br /> .j r <br /> ♦ Collect three sets of groundwater samples (Anlab persoiuiel will perform the actual <br /> sample collection and handling); <br /> I <br /> ♦ Refrigerate one set of samples without preservation; <br /> ♦ Acidify one set of samples without filtering and then refrigerate, <br /> ♦ Filter, acidify and refrigerate the last set; <br /> P <br /> ♦ Analyze all three sets of samples, including filter paper, for total lead; and <br /> ♦ Document findings, including interpretation of findings. <br /> Discussion <br /> ♦ Purge and Sample groundwater monitoring wells <br /> Each groundwater monitoring well will be purged a minimum of three well volumes prior to <br /> E <br /> 50101 3 <br /> , is <br />