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819 Striker Avenue Suite 8 <br /> Sacrame <br /> Sequoia nto )9 95634 <br /> 16) (916)921 9600 <br /> Analytical FAX(916)921otoo <br /> Y www sequoialabs com <br /> SECOR International-Rancho Cordova Project TOSCO 8671,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/14/02 15 16 <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 Levet Result %REC Limits RPD Limit Notes <br /> Batch 1120329-EPA 5030B(P/'f) <br /> Blank(1120329-BLKI) Prepared&Analyzed 12/26/01 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert butyl ether ND 2 5 " <br /> Surrogate a a a-Trifluorotoluene 110 100 110 60-140 <br /> LCS(1120329-BSI) Prepared&Analyzed 12/26/01 <br /> Benzene 102 050 ug/l 100 102 70-130 <br /> Toluene 101 050 100 101 70-130 <br /> Ethylbenzene 991 0 50 100 99 1 70-130 <br /> Xylenes(total) 302 0 50 300 101 70-130 <br /> Xylenes <br /> tent-butyl ether 106 2 5 100 106 70-130 <br /> Surrogate aaa-Trifluorotoluene 118 100 118 60-140 <br /> Matrix Spike(1 120329-MS 1) Source 5112254-01 Prepared&Analyzed 12/26/01 <br /> Benzene 101 050 ug/l 10 0 ND 101 60-140 <br /> Toluene 991 050 10 0 ND 99 1 60-140 <br /> Ethylbenzene 983 050 100 ND 98 3 60-140 <br /> Xylenes(total) 294 050 300 ND 980 60-140 <br /> Methyl tert butyl ether 135 2 5 100 ND 135 60-140 <br /> Surrogate a a a-Trlfluorotoluene 103 100 103 60-140 <br /> Matrix Spike Dup(1120329-MSD1) Source 5112254-01 Prepared&Analyzed 12/26/01 <br /> Benzene 106 0 50 ug/1 100 ND 106 60-140 4 83 25 <br /> Toluene 104 050 100 ND 104 60-140 4 83 25 <br /> Ethylbenzene 104 050 100 ND 104 60-140 564 25 <br /> Xylenes(total) 313 050 300 ND 104 60-140 626 25 <br /> Methyl tert-butyl ether 14 6 25 100 ND 146 60-140 7 83 25 QM-07 <br /> Surrogate a a a-Trifluorotoluene 108 100 108 60-140 <br /> 0Sequota 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 20 of 27 <br />