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i <br /> i <br /> ties <br /> July 15, 1992 <br /> Job No. 074-013 <br />' Page 6 <br /> O Oil and grease by EPA 418. 1 analysis <br />' © TPH as diesel by EPA 3550/8015 methods <br /> ® TPH as kerosene by EPA 3550/8015 procedures <br /> © TPH as gasoline by EPA 5030/8015 methods <br />' O BTEX by EPA 8020 analysis <br /> O Total (TTLC) metals - CAM 17 plus chromium VI by EPA <br /> methods 6010, 7060, 7196, 7421 , <br /> 7471 , 7740 and 7841 <br />' o Soluble (STLC) metals - CAM 17 plus chromium VI by the citric <br /> acid Waste Extraction Test (W.E.T.) <br /> . utilizing the above listed EPA <br /> analytical methods <br />' O Toxicity by 96-hour Static Acute Hazardous Waste Bioassay <br /> TEST RESULTS <br /> Waste Oil Tank Excavation <br />' The actual laboratory data are presented in the Appendix. The data indicate that <br /> neither gasoline nor BTEX compounds were detected in any of the excavation <br /> samples. The testing for total metal concentrations indicate consistent results for all <br /> the samples. Ranges of total concentrations include the following: (1 ) 120-150 <br /> parts-per-million (ppm) barium; i;2) 32-40 ppm copper; (3) 35-51 ppm nickel; and (4) <br /> 52-60 ppm vanadium. These results are within the expected background range and <br />' well below respective Title 22 TTLC's (Total Threshold Limit Concentrations). <br /> Measured soluble concentrations are at least 23 times less than respective STLC's <br /> (Soluble Threshold Limit Concentrations), The pH of the center excavation bottom <br /> sample (W 14C) measured 9.0. Based on the measured basic property, excessive <br /> leaching of metals is not a concern; moreover, no elevated metals concentrations <br /> were detected in any of the tank excavation samples. <br />' For detailed review of the test results, refer to the laboratory Pp data in the Appendix and <br /> the sample locations on Plate 3. <br /> ■ Geotechnical <br /> ami <br /> 1 <br /> ro <br /> AC <br />