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N/EISS ASSOCIATES <br /> • <br /> 3. CONCLUSIONS <br /> Results of the investigation include <br /> • Up to 28,000 ppm propylene glycol and 1,200 ppm ethylene glycol was detected in <br /> the soil samples beneath Tank 1, and up to 2,600 ppm propylene glycol was <br /> detected In a sample beneath Tank 6 <br /> • No ethylene glycol or propylcnc glycol were detected In the soil samples beneath <br /> Tank 5 <br /> • The chromium and copper analytic results for all the samples collected beneath <br /> Tanks 7 and 8 were below DHS STLCs <br /> • The soluble hexavalent chromium analytic results for three out of the four Tank <br /> 8 samples exceeded the soluble hexavalent chromium STLC <br /> • Analytic results for all of the Tank 7 samples are similar to the analytic results for <br /> the background native soil samples <br /> • Chromium,calcium and chlorides in all of the Tank 8 samples significantly exceed <br /> the natural background concentrations of these compounds In the background <br /> native soil samples <br /> These results suggest a release from or adjacent to Tanks 1, 6 and 8 <br /> Further investigation is required to identify the source and extent of the propylene and <br /> ethylene glycol below Tanks 1 and 6 and the excess hexavalent chromium, calcium and <br /> chloride beneath Tank 8 <br />• <br /> F 1ALL1331DWC\33ILIFED WP Page 18 <br />