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885 Jarvis Drive <br /> � Sequoia MorganHi3l CA 95037 <br /> (408)776 9600 <br /> Analytical FAX(408)782 6308 <br /> www sequoialabs corn <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133,Rancho Cordova,CA MNC0535 <br /> 3017 Kilgore Rd Suite 100 Project Number N/P Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/05/04 16 18 <br /> Purgeable Hydrocarbons (C6-C10) & Volatile Organic Compounds by EPA method 8260B- 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 4C31002-EPA 50308 P/T <br /> Laboratory Control Sample Du (4C31002-BSD2) Prepared&Analyzed 03/31/04 <br /> Gasoline Range Organics(C6-C 10) 357 50 ug/l 440 81 1 70-124 7 26 20 <br /> Surrogate 12-Dechloroethane-d4 490 500 980 78-129 <br /> Matrix Spike(4C31002-MS1) Source MNC0710-14 Prepared 03/31/04 Analyzed 04/01/04 <br /> Gasoline Range Organics(C6-C 10) 19700 2500 ug/I 22000 2500 78 2 70-124 <br /> Methyl tert-butyl ether 1830 25 496 1300 107 63-137 <br /> Benzene 308 25 320 11 92 8 69-124 <br /> Toluene 1810 25 1480 ND 122 78-129 <br /> Ethylbenzene 400 25 348 5 5 113 84-132 <br /> Xylenes(total) 1810 25 1680 18 107 83-137 <br /> Surrogate 12-Drchloroethane-d4 4 95 500 990 78-129 <br /> AdIhMatrix Spike Du 4C31002-MSD1) Source MNC0710-14 Prepared 03/31/04 Analyzed 04/01/04 <br /> asoline Range Organics(C6-C10) 18700 2500 119/1 22000 2500 73 6 70-124 5 21 20 <br /> Methyl tert-butyl ether 1770 25 496 1300 948 63-137 3 33 20 <br /> Benzene 292 25 320 11 87 8 69-124 5 33 20 <br /> Toluene 1720 25 1480 ND 116 78-129 5 10 20 <br /> Ethylbenzene 391 25 348 5 5 111 84-132 2 28 20 <br /> Xylenes(total) 1730 25 1680 18 102 83-137 4 52 20 <br /> Surrogate 12-Drchloroethane-d4 4 72 300 94 4 78-129 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> bases This analytical report must be reproduced to its entirety <br /> Page 15 of 21 <br />