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Page 2 of 73 <br /> alscience <br /> n vironmental <br /> aboratories, Inc. <br /> CASE NARRATIVE <br /> Calscience Work Order No.: 10-09-0132 <br /> EPA 8260 - Contamination of the Method Blank <br /> Trace levels (between the reporting limit and method detection limit) of TPPH were <br /> identified and reported in the following Method Blank batch: <br /> Batch # 100911 L01 on GC/MS QQ <br /> Samples #1, 8, 10, 11, 12, 13, and 14: The levels of TPPH found in these samples are <br /> much greater than the blank contamination. The trace level found in the method blank is <br /> not expected to have any significant impact on the sample data. <br /> Samples #4, 5, 6, and 7: Trace levels of TPPH found in these samples are consistent <br /> with those found in the method blanks and are more likely a laboratory artifact. <br /> Samples #3 and 9: TPPH values were reported at a level of more than 2x the blank <br /> contamination. The trace levels found in the method blanks are not expected to have a <br /> significant impact on the sample data, although the reported concentration may be <br /> slightly bias high. <br /> Batch# 100911 L02 on GC/MS QQ <br /> Samples #15, 16, 19, 21, 23, 27, 35, 36, and 37: The levels of TPPH found in these <br /> samples are much greater than the blank contamination. The trace level found in the <br /> method blank is not expected to have any significant impact on the sample data. <br /> Samples #28 and 39: Trace levels of TPPH found in these samples are consistent with <br /> those found in the method blanks and are more likely a laboratory artifact. <br /> 7440 Lincoln Way, Garden Grove, CA 92841-1427 • TEL:(714) 895-5494 • FAX:(714) 894-7501 <br />