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885 Jarvis Dr <br /> Sequoia Mlnrgan Hill,CA 95037 <br /> (408)776 9600 <br /> Analytical FAX(408)782-6308 <br /> www sequoralabs can <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 Benkosky 12/23/02 10 48 <br /> Total Purgeable Hydrocarbons (C6-CIO) 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 2LO3004-EPA 5030B [P/Tl <br /> Blank(2L03004-BLKi) Prepared&Analyzed 12/03/02 <br /> Gasoline Range Organics(C6-C 10) ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl cert-butyl ether ND 25 <br /> Surrogate a a a-Tr�fluorotoluene 101 100 101 55-142 <br /> Laboratory Control Sample(2L03004-BSI) Prepared&Analyzed 12/03/02 <br /> Benzene 11 6 050 ug/l Too 116 68-140 <br /> Toluene 1 1 9 050 100 <br /> 119 76 127 <br /> Wenlbenzene 114 0 50 100 <br /> 114 77-]30 <br /> es(total) 365 050 300 <br /> 122 78 128 <br /> Surrogate a,a a-7Fiuorotoluene 118 10 0 118 55-142 <br /> Laboratory Control Sample(2L03004-BS2) Prepared&Analyzed 12/03/02 <br /> Gasoline Range Organics(C6-C 10) 260 50 119/1 250 104 62-134 <br /> Surrogate a a a-Try7uorotoluene 15 7 100 157 55-142 S-02 <br /> Laboratory Control Sample Dup(2L03004-BSD1) Prepared 12/03/02 Analyzed 12/04/02 <br /> Benzene 826 0 50 ug/l Wo 82 6 68-140 336 30 QR 02 <br /> Toluene 833 0 50 10 0 83 3 76-127 35 3 30 QR-02 <br /> Ethylbeazene 796 050 100 79 6 77 130 35 5 21 QR-02 <br /> Xylenes(total) 25 6 050 300 85 3 78-128 35 1 21 QR-02 <br /> Surrogate aaa-Y5i luorotoluene 557 100 55 7 55-142 <br /> Laboratory Control Sample Dup(2L03004-BSD2) Prepared 12/03/02 Analyzed 12/04/02 <br /> Gasoline Range Organics(C6-CIO) 242 50 119/1 250 96 8 62-134 7 17 41 <br /> Surrogate a a a-Trtfluorotoluene 103 11 100 103 55-142 <br /> Sequoia Analyttcal-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document {Inlets otherwise stated,results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 23 <br />