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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoulabs com <br /> SECOR International-Rancho Cordova Project Tosco 1205,Lathrop,CA <br /> 3017 Kilgore Road,State 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project M-9- Rusty Benkosky 04/12/02 16 39 <br /> Total Purgeable Hydrocarbon,BTEX and MTBE by DHS LUFT-Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reportmg Spike Source %REC RPD <br /> Analyte Result Limit Umts Level Result %REC Lunits RPA Limit Notes <br /> Batch 2040106-EPA 5030E(PfD <br /> Blank 2040106-BLKIPrepared&Analyzed 04/05/02 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) _ ND 0 50 " <br /> Methyl tett-butyl ether ND 25 " <br /> Surrogate aa a-Trifluorotoluene 106 100 106 60-140 <br /> LCS(2040106-BS1) Prepared&Anal3ed 04/05/02 <br /> Benzene 7 85 050 ug/1 10 0 785 70-130 <br /> Toluene 8 78 0 50 10 0 878 70-130 <br /> Ethylbenzene 970 0 50 10 0 97 0 70-130 <br /> Xylenes(total) 300 0 50 300 100 70-130 <br /> J111hMethyl tert-butyl ether 10 9 2 5 t0 0 109 70-130 <br /> Surrogate a a a-Trifluorotoluene 112 100 112 60-140 <br /> Matrix Spike(2040106-MS1) Source 5204022-06 Prepared&Analyzed 04/05/02 __• <br /> Benzene 7 43 0 50 ug/1 10 0 ND 743 60-140 <br /> Toluene 8 12 0 50 10 0 ND 81 2 60-140 <br /> Ethylbenzene 8 95 0 50 10 0 ND 895 60-140 <br /> Xylenes(total) 266 0 50 300 ND 88 7 60-140 <br /> Methyl tert-butyl ether 939 2 5 too ND 93 9 60-140 <br /> Surrogate a a a-TriJluorotoluene 105 100 105 60-140 <br /> Matrix Spike Du 2040106-MSD1 Source 5204022-06 Prepared&Anal d 04/05/02 <br /> Benzene 8 03 050 ug/l 100 ND 803 60-140 776 25 <br /> Toluene 8 86 0 50 10 0 ND 88 6 60-140 872 25 <br /> Ethylbenzene 9 82 0 50 10 0 ND 982 60-140 927 25 <br /> Xylenes(total) 307 050 300 ND 102 60-140 143 25 <br /> Methyl tert-butyl ether 10 2 2 5 100 ND 102 60-140 827 25 <br /> Surrogate a a,a-Trifluorotoluene 106 100 106 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 12 of 14 <br />