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�j')— (707) <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> ��'' Petaluma CA 94954 <br /> 792-1865Analytical <br /> FAX equoi labs c 42 <br /> www sequoialahs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P403078 <br /> 3017 Ktlgare Road Suite 100 Prolect Number 38984 Reported <br /> Rancho Cordova CA,95670 Protect Manager Rusty Benkosky 03/19/04 15 02 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC. Limits RPD Limit Notes <br /> Batch 4030376-EPA 5030B waters <br /> Matrix Spike Du 4030376-MSD/ Source P403098-03 Prepared&Analyzed 03/15/04 <br /> Benzene 5 31 050 ug/1 500 ND 106 81-118 0 8 20 <br /> Ethylbenzene 5 42 0 50 5 00 ND 108 89-122 0 4 20 <br /> Methyl tent-butyl ether 6 10 050 5 00 0 50 112 77-123 2 20 <br /> Toluene 5 18 050 5 00 ND 104 84-119 3 20 <br /> Xylenes(total) 16 4 050 15 0 ND 109 86-132 1 20 <br /> Surrogate Dibromofluoromethane 5 13 500 103 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 506 500 101 74-135 <br /> Surrogate Toluene d8 461 500 92 84-119 <br /> Batch 4030378-EPA 5030E waters - <br /> Blank(4030378-BLK1) Prepared&Analyzed 03/15/04 <br /> Benzene ND 050 119A <br /> Ethylbenzene <br /> - <br /> Ethylbenzene ND 050 " <br /> Methyl Cert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 538 6 40 90 84-122 <br /> Surrogate 12-Dichloroethane-d4 529 600 88 74-135 <br /> Surrogate Toluene d8 586 600 98 84-119 <br /> Laborato�Control Sample(4030378-BSI) _-_ P p d&Analncd 03/15/04 <br /> Benzene 442 0 50 ugll <br /> 88 81-118 <br /> Ethylbenzene 448 0 50 5 00 90 89-122 <br /> Methyl tent-butyl ether 435 0 50 5 00 87 77-123 <br /> Toluene 420 0 50 5 00 84 84-119 <br /> Xylenes(total) 13 9 0 50 15 0 93 86-132 <br /> Surrogate Dibromofluoromethane 562 600 94 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 562 6 00 94 74-135 <br /> Surrogate Toluene d8 584 600 97 84-119 <br /> Sequoia Analytical-Petaluma 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 17 of 23 <br />