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6) (40Sp • 885 Jarvis Drive <br /> equoia Morgan Hill CA 95037 <br /> Analytical FAX <br /> 8)7 960 <br /> 408 78282 6308 <br /> 10 TQF Www sequoialabs cam <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 /> 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 4C22001-EPA 5030B P/T <br /> Laboratory Control Sam le 4C22001-BSI) Prepared&Analyzed 03/22/04 <br /> Xylenes(total) 28 6 0 50 ug/1 30 0 953 83-137 <br /> Surrogate 12-Dichloroethane-d4 531 5 00 106 78-129 <br /> Laborator Control Sample(4C22001-BS2 Prepared&Analyzed 03/22/04 <br /> Gasoline Range Organics(C6-C 10) 319 50 ug/I 440 72 5 70-124 <br /> Surrogate 12-Dichloroethane-d4 5 34 5 00 107 78-129 <br /> Laboratory Control Sample Du 4C22001-BSD1 Prepared&Analyzed 03/22/04 <br /> Ethanol 211 100 09/1 200 106 31-143 240 20 <br /> tert-Butyl alcohol 45 5 20 50 0 91 0 56-131 6 18 20 <br /> Methyl tert-butyl ether 102 0 50 100 102 63-137 000 20 <br /> Di-isopropyl ether 8 22 0 50 100 922 76-130 l 35 20 <br /> 10thyl tert-butyl ether 9 80 0 50 100 980 81-121 0 509 20 <br /> ,rt-Amyl methyl ether 10 1 0 50 " 100 101 82-140 7 07 20 <br /> 1,2-Dichloroethane 11 2 0 50 100 112 77-136 3 64 20 <br /> 1,2-Dibromoethane(EDB) It 2 0 50 100 112 77-132 457 20 <br /> Benzene 8 97 0 50 100 89 7 69-124 1 57 20 <br /> Toluene 9 73 0 50 100 97 3 78-129 3 66 20 <br /> Ethylbenzene 9 83 0 50 100 98 3 84-132 2 58 20 <br /> Xylenes (total) 29 7 0 50 300 990 83-137 3 77 20 <br /> Surrogate 12-Dichloroethane-d4 5 31 S 00 106 78-129 <br /> Laboratory Control Sample Dup(4C22001-BSD2) Prepared&Analyzed 03/22/04 <br /> Gasoline Range Organics(C6-C 10) 338 50 ug/1 440 76 8 70-124 5 78 20 <br /> Surrogate 12-Dtchloroethane-d4 536 5 00 107 78-129 <br /> _Matrix Spike(4C22001-MSI) Source MNCO535-09 Prepared 03/22/04 Analyzed 03/23/04 <br /> Gasoline Range Organics(C6-C 10) 7200 1000 ug/1 8800 1300 67 0 70-124 QM02 <br /> Methyl tert butyl ether 970 10 202 770 99 0 63-137 <br /> Benzene 96 0 10 130 5 6 69 5 69-124 <br /> Toluene 628 10 594 ND 106 78-129 <br /> h.thylbenzene 148 10 144 ND 103 84-132 <br /> Xylenes(total) 748 10 674 ND ill 83-137 <br /> Surrogate 12-Dichloroethane-d4 5 21 5 00 104 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 /> basis This analytical report must be reproduced in its entirety <br /> Page 19 of 21 <br /> { <br />