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WEISS ASSOCIATE'S g <br /> 3 CONCLUSIONS <br /> Results of the investigation include <br /> • No ethylene glycol and propylene glycol were detected deeper than 45 3 ft below <br /> Vault 1, although up to 9,900 ppm propylene glycol and 500 ppm ethylene glycol <br /> were detected in shallower soil samples beneath Vault 1 <br /> • Although neither compound was detected below 33 4 ft depth at Vault 6,up to 22,000 <br /> ppm propylene glycol and 3,000 ppm ethylene glycol were detected in shallower soil <br /> samples beneath Vault 6 <br /> • The total chromium and total hexavalent chromium analytic results for all soil <br /> samples collected beneath Vault 8 were below their respective DHS TTI-Cs Vault 8', <br /> soluble total chromium analytic results for soil were below the DHS STLC for <br />' soluble total chromium Total chromium, total hexavalent chromium and soluble <br /> total chromium concentrations generally decreased with depth, and the analytic <br /> results for the deepest analyzed sample, at 55 6 ft, were approximately an order of <br /> magnitude less than the analytic results for the shallowest samples <br /> • Calcium and chloride concentrations in soil samples from all depths investigated <br /> below Vault 8 are above background concentrations <br /> Sodium concentrations in Vault 8 soil samples were not significantly• P g Y above <br /> background in any of the samples <br /> • Ethylene glycol and propylene glycol were not detected in ground water samples <br /> from monitoring wells MW-1 and MW-2 adjacent to Vaults 1 and 6, respectively <br /> • Ground water samples from monitoring well MW-3 adjacent to Vault 8 contained <br /> 0 11 ppm soluble hexavalent chromium <br /> • The concentrations of sodium, calcium, and chloride in the MW-3 water samples are <br /> below health or aesthetic standards <br /> 1 <br /> r <br /> 1 D 1ALL1331DWG1331R1MA1 WP Page 12 <br />