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819 Striker Aveque,Suite p <br /> Sequoia Sacramento, 95834 <br /> (915))921-96W <br /> Analytical FAX(916)921-0100 <br /> www sequoudabs com <br /> SECOR International-Rancho Cordova Project ARCO 2133,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number 2133,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/24/02 18 09 <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 %REC Limits RPD Lima Notes <br /> Batch 2060224-EPA 5030B(PIT) <br /> Matrix Spike(2060224-MSI) Source 5206172-23 Prepared&Analyzed 06/18/02 <br /> Benzene 994 050 ug/1 100 ND 98 60-140 <br /> Toluene 101 050 100 ND 101 60-140 <br /> Ethylbenzene 30 1 050 100 21 9l 60-140 <br /> Xylenes(total) 117 0 50 " 300 92 83 60-140 <br /> Methyl tert-butyl ether 124 25 100 ND 124 60-140 <br /> Surrogate a,a,a-Tri,Jluorotoluene 101 100 101 60-140 <br /> Matnx Spike Dup(2060224-MSDI) Source 5206172-23 Prepared&Analyzed 06/18/02 <br /> Benzene 104 050 ugll 100 ND 102 60-140 5 25 <br /> Toluene 107 0 50 100 ND 107 60-140 6 25 <br /> Ethylbenzene 32 1 0 50 100 21 ill 60-140 6 25 <br /> Xylenes(total) 122 0 50 " 300 92 100 60-140 4 25 <br /> Methyl tert-butyl ether 13 1 25 100 ND 131 60-140 5 25 <br /> Surrogate a,a,a-Trlfluorotoluene 994 100 99 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed In accordance with the chat <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 9 of 10 <br />