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819 Striker Avenue,Suite 8 <br /> nto,CA 5834 <br /> a— ) <br /> Sequoia Sacrame(916)2199600 <br /> FAX(916)921-0100 <br /> Analytical WWW sequolalabscom <br /> ECOR international-Rancho Cordova Project ARCO 595,Stockton, CA <br /> 3017 Kilgore Road,Suite 100 Project Number 595,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/30/02 14 12 <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 Level Result %REC Limits RPD Limit Notes <br /> Batch 2070256-EPA 5030B(PIT <br /> Blank(2070256-BLK1) Prepared&Analyzed 07/25/02 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert butyl ether ND 25 " <br /> Surrogate a a a-Trac luorotoluene 104 100 104 60-140 <br /> LCS(2070256-BSI) Prepared&Analyzed 07/25/02 <br /> Benzene 10 2 050 ug/1 10 0 102 70-130 <br /> Toluene 10 7 050 10 0 107 70-130 <br /> Ethylbenzene 10 6 050 10 0 106 70-130 <br /> Xylenes(total) 324 050 300 108 70-130 <br /> rethyl tert-butyl ether 946 25 100 95 70-130 <br /> Surrogate a a a-Trifluorotoluene 112 100 112 60-140 <br /> Matrix Spike(2070256-MSI) Source 5207249-08 Prepared&Analyzed 07/25/02 <br /> Benzene 945 050 ug/l 100 ND 94 60-140 <br /> Toluene 104 050 100 ND 101 60-140 <br /> Ethylbenzene 103 050 100 ND 103 60-140 <br /> Xylenes(total) 315 050 30 0 ND 105 60-140 <br /> Methyl tert-butyl ether 11 9 25 10 0 ND 106 60-140 <br /> Surrogate a a a-Triuorotoluene 109 100 109 60-140 <br /> Matrix Spike Dup(2070256-MSDI) Source S207249-08 Prepared&Analyzed 07/25/02 <br /> Benzene 101 050 ug/] 10 0 ND 101 60-140 7 25 <br /> Toluene 11 1 050 10 0 ND 108 60-140 7 25 <br /> Ethylbenzene 109 050 10 0 ND 109 60-140 6 25 <br /> Xylenes(total) 334 050 300 ND 111 60-140 6 25 <br /> Methyl tert-butyl ether 132 2 5 10 0 ND 119 60-140 10 25 <br /> Surrogate a a a-Trifluorotoluene 107 100 107 60-140 <br /> I <br /> Sequoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page Page 13 of 16 <br />