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TOTAL PETROLEUM HYDROCARBONS AS BTEX <br /> INCHCAPE TESTING SERVICES - ANAMETRIX <br /> (408) 432-8192 <br /> MATRIX SPIKE RECOVERY REPORT <br /> Client Project ID 231800 Anametnx ID 9603067-05 <br /> Client Sample ID MW-3A Date Released 3/19/96 <br /> Date Sampled 3/7/96 Instrument ID HP 12 <br /> Date Analyzed 3/13/96 Matrix WATER <br /> Concentration Units ug/L <br /> COMPOUND SPIKE SAMPLE MS % REC MSD %REC <br /> NAME AMT CONC CONC MS CONC MSD RPD <br /> MtBE 100 0 105 105% 106 106% 1% <br /> Benzene 100 0 100 100% 99 99% -1% <br /> Toluene 100 0 98 98% 100 100% 2% <br /> Ethylbenzene 100 0 104 104% 105 105% 1% <br /> Total Xylenes 100 0 106 106% 113 113% 6% <br /> p-Bromofluorobenzene 106% 107% <br /> Quality control limits for MS/MSD recovery are 50-150% for MtBE, 45-139% for <br /> benzene, 51-138% for toluene, 48-146% for ethylbenzene, and 50-139% for total <br /> xylenes <br /> Quality control limits for RPD(relative percent difference) are +/- 30% <br /> Quality control limits for p-Bromofluorobenzene recovery are 61-139% <br /> RESULTS -TPHg/BTEX - Page 19 Issued on 3/19/96 at 4 57 pm <br />