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` W ISS ASSOCL47-ES <br /> The Tank 7 and 8 soil samples were initially analyzed for soluble chromium, copper, <br /> total sodium and total sulfate The Tank 8 samples were also analyzed for calcium and <br /> chlorides The Tanks 6, 7 and 8 uncontaminated native soil samples were analyzed for <br /> chromium, copper, total sodium, calcium, sulfate and chlorides to determine natural <br /> background concentrations of these compounds Extraction and analytic methods for these <br /> samples are shown on Table 2 <br /> Ethylene and propylene glycol were detected in three out of four samples beneath Tank <br /> 1 and in one of four samples beneath Tank 6 The maximum concentrations detected were <br /> 1,200 parts per million (ppm) ethylene glycol and 28,000 ppm propylene glycol, respectively, <br /> both in the 10 0 ft Tank I sample Propylene glycol at 2,600 ppm was detected in the 9 7 ft <br /> sample beneath Tank 6 No ethylene glycol or propylene glycol was detected in the Tank 5 <br /> sa mples <br /> The soluble chromium and copper analytic results for the Tank 7 and 8 samples using <br /> the California Administrative Code Title 22 Waste Extraction Test (WET) were below their <br /> respective California Department of Health Services (DHS) Soluble Threshold Limit <br /> Concentrations (STLC) Although the Tank 8 soluble chromium analytic results were below <br /> • the chromium STLC, they exceeded the hexavalent chromium STLC To determine whether <br /> the soluble hexavalent chromium concentration in these samples exceeded the soluble <br /> hexavalent chromium STLC, the Tank 8 samples were re-analyzed for soluble hexavalent <br /> chromium by EPA Method 7196, colorimetric The soluble hexavalent chromium analytic <br /> results for three of the four samples slightly exceeded the soluble hexavalent chromium STLC <br /> of 5 ppm <br /> F\ALL\331DWC\33iL1FE9 WP 11-igc 17 <br />