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MATRIX ENVIRONMENTAL LABORATORIES <br /> ANALYSIS• BTEX SPIKE SUMMARY <br /> CLIENT: Helmick & Lerner, Inc. <br /> CONTACT: D. Nakamoto Date Sampled: N/A <br /> COC No: 4387 Date Received: N/A <br /> Project No: HLI 10101 Date Extracted: N/A <br /> Sample ID: N/A Date of Analysis: 4/3/94 <br /> Lab ID: MS/MSD Matrix: WATER <br /> CONC CONC PERCENT <br /> COMPOUND SPIKED MEASURED RECOVERY <br /> ug/L MS MSD MS MSD RPD <br /> (ppb) <br /> BENZENE 11. 76 11..83 12 . 17 101% 104% 3% <br /> TOLUENE 17 . 92 17 .71. 18 . 10 99% 101% 2% <br /> ETHYL BENZENE 13 .80 13 . 63 13 .95 99% 101% 2% <br /> TOTAL XYLENES 35 . 28 34 .82 35. 69 99% 101% 2% <br /> MS= MATRIX SPIKE <br /> MSD= MATRIX SPIKE DUPLICATE <br /> RPD= RELATIVE PERCENT DIFFERENCE <br /> CONC= CONCENTRATION <br /> G <br />