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a, <br /> 819 Striker Avenue Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> 4D (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs corn. <br /> 7SECOR International-Rancho Cordova Protect ARCO 2093,Tracy,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 P-Jcct Mtanager Rusty Benkosky 09/28/01 16 24 <br /> Total Purgeable Hydrocarbon,BTEX and MTBE by DHS LUFT- Quality Control <br /> Sequoia Analytical -Sacramento <br /> Reporting Spike Source %RhC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1090222-EPA 5030E(P/T) <br /> Blank(1090222-BLKI) Prepared&Analyzed 09/20/01 <br /> Purgeable Hydrocarbons ND 50 118/1 <br /> Benzene ND 0 50 " <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-TrPuorotoluene 114 " 100 114 60-140 <br /> LCS(1090222-BSI) _ Prepared&AnaIyzed 09/20/01 <br /> Benzene 101 050 1-19/1 10 0 101 70-130 <br /> Toluene 977 050 " 10 0 977 70-I30 <br /> Ethylbenzene 9 80 050 10 0 980 70-130 <br /> lenes(total) 295 0 50 300 98 3 70-130 <br /> ethyl tert-butyl ether 10 9 25 10 0 109 70-130 <br /> Surrogate a a a-Trrfluorotoluene 112 100 112 60-140 <br /> Matrix Spike(1090222-MS1) Source 5109228-08 Prepared&Analyzed 09/20/01 _ <br /> Benzene 10 6 050 119/1 10 0 ND 106 60-140 <br /> Toluene 10 3 0 50 " 10 0 ND 103 60-140 <br /> Ethylbenzene 10 4 0 50 100 ND 104 60-140 <br /> Xylenes(total) 31 1 0 SO 30 0 ND 104 60-140 <br /> Methyl tert-butyl ether 129 2 5 100 ND 129 60-140 <br /> Surrogate a a a-TriJluorotoluene 116 100 116 60-140 <br /> Matrix Spike Dup(1090222-MSDI) Source S109228-08 Prepared&Analyzed 09/20/01 <br /> Benzene 10 6 0 50 ug/1 100 ND 106 60-140 0 00 25 <br /> Toluene 104 0 50 10 0 ND 104 60-140 0 966 25 <br /> Ethylbenzene 105 050 " 10 0 ND 105 60-140 0 957 25 <br /> Xylenes(total) 31 0 050 " 30 0 ND 103 60-140 0 322 25 <br /> Methyl tert-butyl ether 13 8 25 10 0 ND I38 60-140 674 25 <br /> Surrogate a a a-Trifluorotoluene 11 1 100 111 60-140 <br /> quota 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 13 <br />