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Roy F. Weston, Inc. - Stockton Laboratory <br /> Case Narrative <br /> nt• THOPPE OIL Project #:L89052 <br /> � : 11820 <br /> ' 'tiles Case Narrative <br /> TVH analysis : <br /> 1 . This narrative covers the analysis of seventeen (17) <br /> soils <br /> 2. All hold times have been met for this analysis. <br /> 3 . Initial calibration criteria was met for this analysis . <br /> 4. Continuing calibration criteria was met for this analysis <br /> with the exception of rep #24 which was low. <br /> 5. The method blank associated with this group of samples <br /> . was free of target analyte interferences at, or above, the <br /> reporting limits. <br /> 6. There was no surrogate used in this analysis. <br /> 7. All spikes were within QC limits. <br /> BTEX analysis: <br /> 1 . This narrative covers the analysis of seventeen (17) <br /> soil samples. <br /> 2 . All hold times were met for primary quantitation <br /> analysis . <br /> 3. Initial and continuing calibration was high due to <br /> the increased lamp sensitivity. Results may be biased high <br /> however, all analy,is was confirmed. <br /> 4 . The method blank associated with this group of samples <br /> resulted in Ethylbenzene, Tolune, and Xylene being above <br /> reporting limits, however, this was caused by increased <br /> lamp sensitivity . <br /> 5 . Surrogates were within acceptable limits. <br /> 6. Spike recoveries were high, however, RPD` s were within <br /> control limits. <br /> I,/" —!EL11 <br /> G.R. Adams Date <br /> Unit Leader <br />