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819 Striker Avenue Suite 8 <br /> Sequoia <br /> Sacramento C2 95834 <br /> (9 t 6)9z t-9600 <br /> FAX(916)921-0100 <br /> Analytical wvvw sequolalabs com <br /> SECOR International-Rancho Cordova Project ARCO 2133,Stockton,CA <br /> 3017 Kilgore Road, Suite 100 Project Number NIA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 09/10/01 14 56 <br /> Total Purgeable Hydrocarbon, BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units LeVtl Result %REC Limits RPD Limit Notes <br /> Batch 1090060- EPA 5030B(PIT) <br /> LCS(10_90.060-BSI_) Prepared&Analyzed 0910610. 1 <br /> Benzene �- — - - -----�9 51 050 ug/l I 0 0---- 95 1 70-130 - <br /> Toluene 8 88 050 100 88 8 70-130 <br /> Ethylbenzene 934 050 100 93 4 70-130 <br /> Xylenes(total) 255 050 300 85 0 70-130 <br /> Methyl tert-butyl ether 700 2 5 10 0 700 70-130 <br /> Surrogate a a a-Trifluorololuene 934 100 93 4 60-140 <br /> Matrix Spike(1090060-MS1) Source S_109039-03 Prepared&Analyzed 09/06/01 <br /> Benzene 1 1 0 050 ug/I t0 0 ND 110 60-140 <br /> toluene 947 050 t0 0 ND 947 60-140 <br /> Ethylbenzene 997 050 10 0 ND 997 60-140 <br /> 0 s(total) 28 7 050 300 ND 957 60-140 <br /> Cert-butyl ether 10 7 2 5 100 ND 107 60-140 <br /> Surrogate a a a-Triuorotoluene -- 11 9 �— 100 119 60-140 <br /> Matrix Spike Dup(1090060-MSDI) _________Source S109039-03 _ Prepared&Analyzed 09/06/01 <br /> Benzene a — 117 0 50 ug/l 100 ND 117 60-140 6 17 25 <br /> Toluene 102 050 too ND 102 60-140 742 25 <br /> Ethylbenzene 10 7 050 too ND 107 60-140 706 25 <br /> Xvlenes(total) 31 1 0 50 300 ND 104 60-140 803 25 <br /> Methyl tert-butyl ether 109 2 5 100 ND 109 60-140 185 25 <br /> Surrogate a a a-Triuorotoluene 104 100 104 60-140 <br /> ola Analytical -Sacramento The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 12 of 13 <br />