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819 Striker Avenue.Suite 8 <br /> Sequoia Sacramento.CA 95834 <br /> (916)921-9000 <br /> FAX(916)97 t-0100 <br /> Analytical """"'.amu°ialabs.�n1 <br /> SECOR International-Rancho Cordova Project: ARCO 4493,Stockton,CA Sampled. 5/8100 <br /> 3017 Kilgore Road,Suite 100 Project Number: NIA Received: 5110100 <br /> Rancho Cordova,CA 95670 Proiect Mana e- Ru Senkos Reported: 5/18/00 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Anal a Analyzed Level Result Result Units Recov,Limits % Limit %/. Notes* <br /> Blank(continued) 0050160_-BLK1 <br /> Surrogate: a,a,a-Triuorotolaene S/16/00 10.0 8.57 ug/1 60.0-140 85.7 <br /> ,CS 0050160-BSI <br /> Benzene 5/16/00 10.0 9.88 up/I 74.0-130 98.8 <br /> Toluene to 10.0 9.82 70.0-130 98.2 <br /> Ethylbenzene 10.0 9.93 70.0-130 99.3 <br /> Xylenes(total) 30.0 29.5 70.0-130 98.3 <br /> Methyl tert-butyl ether -T 10.0 9.49 _ 70.0-130 94.9 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 8.92 60.0-140 89.2 <br /> Matrix Spike 0050160-MSl 5005181-03 <br /> Benzene 5/16/00 10.0 ND 9.56 ug/l 60.0-140 95.6 <br /> Toluene <br /> 10.0 ND 9.78 60.0-140 97.8 <br /> „ <br /> E nzene 10.0 ND 9.77 60.0-140 97.7 <br /> Xs(total) 30.0 ND 28.6 60.0-140 95.3 <br /> 60.0-140 66.2 <br /> Methyl tert-butyl ether 10.0 ND 6.62 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 8.20 60.0-140 81.0 <br /> atrix Spike P-UR 0050160-MSDI S005181-03 <br /> Benzene 5116100 10.0 ND 9.93 ug/1 60.0-140 99.3 25.0 3.80 <br /> enze <br /> Toluene 10.0 ND 9.75 " 60.0-140 975 25.0 0.307 <br /> Ethylbenzcne 10.0 ND 9.97 60.0-140 99.7 25.0 2.03 <br /> 30.0 ND 29.7 60.0-140 99.0 25.0 3.81 <br /> Xylenes(total) <br /> Moth 1 tort-butyl ether 10,0 ND 9.63 60.0-140 %3 25.0 37.0 3 <br /> Surrogate: aat+-Trifluorotoluene 10-0 8.61 60 0-]40 86.2 <br /> Batch: 0050187 Date Prensred• 5/16100 Extraction Method: EPA 5030B e0 <br /> lank 0050187-BLKI <br /> Purgeable Hydrocarbons 5116100 ND mg/kg 1.00 <br /> ND 0.00500 <br /> Benzene " <br /> ND " 0.00500 <br /> Toluene ND U.00500 <br /> Ethylbenzene „ 0.00500 <br /> Xylenes(total) ND " <br /> « " � <br /> Methyl tert-butyl ether ISTD 0.050060.0-140 94.5 <br /> Surrogate: a a,a-Trifluorotoluene 0.200 0.189 " <br /> ,CS 0050187-BS1 <br /> Benzene 5/16100 0.200 0.178 mg/kg 70.0-130 89.0 <br /> Toluene 0.200 0.200 70.0-130 100 <br /> Ethylbenzene 0.200 0.211 70.0-130 105 <br /> )C&(total) " <br /> 0.600 0.597 " 70.0-130 99.5 <br /> Sequoia Analytical-Sacramento <br /> "Refer to end of report for text of notes and definitions. <br /> Page 14 of 22 <br />