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.s <br /> 685 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> AdIlk www sequoialabs ccm <br /> ecor-Rancho Cordova Project ARCO#4932,Stockton,CA MLK0860 <br /> 3017 Kilgore Rd Suite 100 Project Number ARCO#4932, Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Senkosky 12/23/02 10 48 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified,BTEXM by EPA 8021B- Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2LO4003 -EPA 5030B [PPT] <br /> Matrix Spike Dup(2L04003-MSD1) Source MLK0860-08 Prepared&Analyzed 12/04/02 <br /> Gasoline Range Organics(C6-C10) 492 50 ug/l 550 ND 895 62-134 109 41 <br /> Benzene 1 1 2 050 660 ND 170 68-140 163 30 QM-07 <br /> Toluene 51 7 050 397 ND 130 76 127 161 30 QM 07 <br /> Ethylbenzene 105 050 920 ND 114 77-130 122 21 <br /> Xylenes(total) 543 050 46 1 ND 118 78-128 138 21 <br /> Surrogate a a a Trifluorotoluene 158 100 158 55-142 QM-07 <br /> Batch 2LO4004 -EPA 50308[PIT] <br /> Blank(21,04004-13LKI) Prepared&Analyzed 12/04/02 <br /> Gasoline Range Organics(C6-C 10) ND 50 ug/l <br /> nzene ND 050 '1 <br /> uene ND 050 <br /> Ithylbenzene ND 050 <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 25 " <br /> Surrogate a a a-Trifluorotoluene 808 100 808 55-142 <br /> Laboratory Control Sample(2L04004-1181) Prepared&Analyzed 12/04/02 <br /> Benzene 9 83 050 ugfl 100 983 68-140 <br /> Toluene 983 050 100 983 76-127 <br /> Ethylbenzene 936 050 too 936 77-130 <br /> Xylenes(total) 300 050 300 100 78-128 <br /> Surrogate aa a-Trifluorotoluene 784 100 784 55-142 <br /> Laboratory Control Sample(2L04004-BS2) Prepared&Analyzed 12/04/02 <br /> Gasoline Range Organics(C6-C 10) 273 50 ug/l 250 109 62-134 <br /> Surrogate a aa-Trifluorotoluene 133 100 133 55-142 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated,results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 17 of 23 <br />