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• <br /> Draft Soils FS Report Memorandum -6- 17 April 1992 <br /> DDRW, Sharpe <br /> thiocarbamate pesticides (Method 630) and carbamate pesticides. Soils and <br /> ground water samples from those WMUs and USTs which contained pesticide may <br /> need to be analyzed for more types of pesticides than organochlorine <br /> pesticides. <br /> In addition, it is unknown if ground water has been impacted in the areas of <br /> the WMUs which contained pesticide wastes. The investigation of these units <br /> and areas is inadequate because pesticides were not sampled in existing wells <br /> or the wells are too far down gradient to perform as detection monitoring <br /> wells. Additional investigation is needed to determine if ground water has <br /> been contaminated by pesticides. <br /> i . Oxidation and Holding Ponds. The oxidation and three holding ponds were <br /> previously investigated and were partially remediated. These ponds contained <br /> hazardous concentrations of wastes. Data from these ponds were discussed in <br /> the Mark Group report submitted (on 8 November 1990) by the Corps of Engineers. <br /> The existing data were not summarized in the Draft Soils FS Report. The data <br /> and conclusions presented in the Mark Group Report should have been summarized <br /> in the Draft Final FS Report. <br /> j . Base Map. The site-wide base map of the site does not reference building <br /> numbers. The Draft Soils FS Report commonly locates the WMUs in reference to a <br /> building. Without the building numbers on the site wide map, it is difficult <br /> to assess the soils contamination in relation to the ground water contamination <br /> or to the USTs. A site-wide base map which references the building numbers <br /> needs to be developed. <br /> k. Dioxins. Analysis for dioxins does not appear to have been performed on soil <br /> samples collected from those WMUs in which wastes were burned (S#29, South <br /> Balloon Burn Pits; S#13, Building 391, Firefighting Training Area; S#18, <br /> Burning Pits) . Soil samples collected from these areas should be analyzed for <br /> dioxins. However, if the chlorinated organics, such as VOCs, semi-VOCs and <br /> pesticides, are not present then analysis for dioxins may not be necessary. <br /> 1 . Total Number of WMUs. The total number of WMUs at DDRW, Sharpe is unknown. <br /> This information could not be found in Section 6.3 of the Remedial <br /> Investigation (RI) Report. It is unknown if all of the WMUs were investigated. <br /> It is unclear what criteria was used to include a select number of WMUs (from <br /> the WMUs investigated and discussed in the RI Report) in the FS Report. This <br /> information should have been summarized in a similar manner to the <br /> summarization of the USTs. <br /> M. Open Dumping WMU from Buildings 170 to 184. Open dumping of wastes from <br /> Buildings 170 to 184 occurred in the North Balloon Area. Nine soil borings <br /> were installed as part of the soil investigation. Elevated levels of metals <br /> and VOCs were detected in the soil samples. The UST investigation revealed <br /> that there are elevated levels chromium, nickel and zinc in three of the newly <br /> installed monitor wells. Samples from one of the monitor wells (MW-472A) <br /> exceeded the Primary Maximum Contaminant Level (MCL) and proposed MCL for <br /> chromium and nickel . It is unknown whether analysis for all of the Title 22 <br /> metals were performed on all soil and ground water samples. It is unclear <br /> whether analysis for Oil and Grease (0&G) , TPHs, and PCBs were performed on the <br />