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� En <br /> 819 Stoker Avenue Sure 8 <br /> CD— Sequoia Sacramento )9 95834 <br /> f (916)921-9600 <br /> Analytical FAX(916) 0 <br /> www sequoialabs labs co com <br /> F <br /> ECOR International-Rancho Cordova Project ARCO 595,Stockton,CA <br /> 17 Kilgore Road, Suite 100 ProjectNumber 595,Stockton,CA Reported <br /> ancho 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 Linut Units Level Result %REC Luruts RPD Lung Notes <br /> Batch 2070256-EPA 5030B(PIT) <br /> Blank(2070256-BLKI) 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 aa-Trtfluorotoluene 104 100 104 60-140 <br /> LCS(2070256-BS1) Prepared&Analyzed 07/25/02 <br /> Benzene 102 0 50 119/1 10 0 102 70-130 <br /> Toluene 10 7 0 50 100 107 70-130 <br /> Ethylbenzene 10 6 050 100 106 70-130 <br /> Xylenes(total) 324 050 300 - 108 70-130 <br /> Methyl tert-butyl ether 946 2 5 100 95 70-130 <br /> Surrogate a a a-Trifluorotoluene 112 ]Do 112 60-140 <br /> Matrix Spike(2070256-MS]) Source 5207249-08 Prepared&Analyzed 07125102 <br /> Benzene 945 050 ug/1 100 ND 94 60-140 <br /> Toluene —10 4� 050- 10 0�� NDS . 101� 60-I40 = _ <br /> Ethylbenzene 10 3 050 10 0 ND I03 60-140 <br /> Xylenes(total) - –315-- ---- 050 300 - -ND--- --105 ---- 60-140 <br /> Methyl tert-butyl ether 119 25 100 ND 106 60-140 <br /> Surrogate a a a-Tnfluorotoluene 109 100 109 60-140 <br /> Matrix Spike Dup(2070256-MSD1) Source 5207249-08 Prepared&Analyzed 07/25/02 <br /> Benzene 101 050 USA 100 ND 101 60-140 7 25 <br /> Toluene 11 1 050 100 ND 108 60-140 7 25 <br /> Ethylbenzene 109 050 100 ND 109 60-140 6 25 <br /> Xylenes(total) 334 050 300 ND 111 60-140 6 25 <br /> - Methyl tent-butyl ether 132 25 100 ND 119 60-140 10 25 <br /> Surrogate a aa-Trtfluorotoluene 107 100 107 60-140 <br /> Sequoia Analytical- Sacramento The results to this report apply to the samples analyzed in accordance with the chain oj� <br /> custody document This analytical report must be reproduced to its entirety <br /> Page Page 13 of 16 <br />