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there appears to be an insufficient number of monitoring wells present around <br /> each extraction well to draw capture zones (especially in the above-upper <br /> horizon) . Therefore, a discussion regarding percent capture of contaminant <br /> plume(s) may be premature. <br /> As discussed in Section 5.4 .2.3 (Page 5-4) and shown in Table 5.4-3 (Page 5- <br /> 14) , treatment plant #1 is operating above and treatment plant #2 is <br /> operating below typically accepted air-to-water ratios for air strippers. <br /> Therefore, improvements in the air-to-water ratio may be required. <br /> It should be noted that Table 3 of Attachment 1 (Summary of Soil and <br /> Leachability Testing at SWMUs 7, 24, 30, and Drum Storage Area, DDJC-Tracy) <br /> indicates that the DI WET Reporting Limits for several compounds are above the <br /> Cleanup Standards and that, therefore, the absence of contamination above the <br /> Cleanup Standard can not be verified. In addition, the results of the <br /> Deionized Water Waste Extraction Test (DI-WET) Sampling indicated that TPH-D <br /> was detected at high leachate concentrations at SWMU 24 (Table 4) . At SWMU 33, <br /> TCE was detected above the MCL at LM002A. <br /> Please feel free to contact me at 415-744-2392 if you have any questions <br /> or comments. <br /> Sincerely, <br /> Michael Work <br /> Federal Facilities Cleanup Office <br /> Superfund Division (SFD-8-3) <br /> cc: (See Distribution List) <br /> 2 <br />