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110 2nd Avenue South, #D7, Pacheco,CA 94553 <br /> McCAMPBELL ANALYTICAL INC. Tele:925-798-1620 Fax: 925-798-1622 <br /> 1 <br /> QC REPORT FOR HYDROCARBON ANALYSES <br />' Date: 09/01/98-09/02/98 Matrix: AIR <br />' Concentration (mg/L) Recovery <br /> Analyte ISample Amount RPI? <br />' I j (n94114) MS MSD Spiked MS MSD <br /> TPH (gas) 0. 0 91.3 96.6 1 100.0 91.3 96 .6 5 .7 <br />' Benzene 1 0.0 8 .9 9.1 [ 10-0 89 .0 91.0 2 .2 <br /> Toluene I 0.0 9.2 9.4 1 10 .0 92 .0 94 .0 2 .2 <br /> Ethyl Benzene 1 0.0 9.4 9.7 1 10.0 94 .0 97.0 3 .1 <br /> Xylenes 1 0.0 28.6 29.3 1 30. 0 4 95 .3 97.7 2 .4 <br /> �TPH(diesel) N/A N/A N/A N/A N/A N/A N/A <br /> TRPH I N/A N/A N/A N/A N/A N/A N/A j <br /> (oil & grease) <br /> ' % Rec. _ (MS - Sample) / amount spiked x 100 <br /> RPD = (MS - MSD) / (MS + MSD) x 2 x 100 <br />