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819 Sinker Avenue,Suite 8 <br /> Sequoia Sacramento, 95834 <br /> r Analytical (916))9 00 <br /> FAX(916)921-0100 <br /> w <br /> wwsequoialalabs c coin <br /> WSECOR 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 RustyBenkosky 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 °/eREC Linuts RPD Limit Notes <br /> Batch 2070242-EPA 5030B /T <br /> Blank(2070242-BLKI) Prepared&Analyzed 07/24/02 <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 tent-butyl ether ND 2 5 " <br /> Surrogate a a a-Trifluorotoluene 105 100 105 60-140 <br /> LCS(2070242-BS1) Prepared&Analyzed 07/24/02 <br /> Benzene 100 050 ug/1 100 100 70-130 <br /> Toluene 106 0 50 100 106 70-130 <br /> Ethylbenzene 105 050 10 0 105 70-130 <br /> Xylenes(total) 322 0 50 300 107 70-130 <br /> ethyl tert-butyl ether 9 93 2 5 10 0 99 70-130 <br /> Surrogate a a a-Trrfluorotoluene 110 100 110 60-140 <br /> Matrix Spike(2070242-MS1) Source S207249-14 Prepared&Analyzed 07/24/02 <br /> Benzene 102 0 50 ug/1 100 ND 102 60-140 <br /> Toluene 107 050 100 ND 107 60-140 <br /> Ethylbenzene 104 0 50 10 0 ND 104 60-140 <br /> Xylenes(total) 313 030 300 ND 104 60-140 <br /> Methyl tert-butyl ether 115 25 10 0 ND 112 60-140 <br /> Surrogate a a a-Trifluorotoluene 106 100 106 60-140 <br /> Matrix Spike Dup(2070242-MSD1) Source S207249-14 Prepared&Analyzed 07/24/02 <br /> Benzene 104 050 ug/1 100 ND 104 60-140 2 25 <br /> Toluene 109 0 50 100 ND 109 60-140 2 25 <br /> Ethylbenzene 106 050 100 ND 106 60-140 2 25 <br /> Xylenes(total) 327 050 300 ND 109 60-140 4 25 <br /> Methyl tent-butyl ether 127 25 100 ND 124 60-140 10 25 <br /> Surrogate a a a-Triuorotoluene 105 100 105 60-140 <br /> quotaAnalytical-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 12 of 16 <br />