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WE1SS ASSOCIATES <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 propylene 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 /> F:\ALL\331DWG\331L1FE9.WP Page 18 <br />