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• 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical (707)792 '365 <br /> FAX(707)792-0342 <br /> we www sequotalabs co. <br /> Seeor-Rancho Cordova Project Arco Site 4932,Stockton,CA P403078 <br /> 3017 YAgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project 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 /> Blank(4030376-BLK1) Prepared&Analyzed 03/15/04 <br /> Benzene ND 050 ugA <br /> Ethylbenzene ND 050 " <br /> Methyl cert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 482 5 00 96 84-112 <br /> Surrogate 1 2-Dichloroethane-d4 5 03 500 101 74-135 <br /> Surrogate Toluene-d8 449 500 90 84-119 <br /> Laboratory Control Sample(4030376-BSI) Prepared&Analyzed 03/15/04 <br /> Benzene 5 32 050 ug/l 5 00 106 81-118 <br /> Ethylbenzene 545 0 50 Soo 109 89-122 <br /> Methyl tert-butyl ether 5 69 050 500 114 77-123 <br /> Toluene 5 18 050 500 104 84-119 <br /> Xylenes(total) 16 8 050 15 0 112 86-132 <br /> Surrogate Dibromofluoromethane 542 5 00 108 84-112 <br /> Surrogate 12-Dtchloroethane-d4 5 43 5 00 109 74-135 <br /> Surrogate Toluene-d8 4 78 300 96 84-119 <br /> Matrix Spike(4030376-MSI) Source P403098-03 Prepared&Analyzed 03/15/04 <br /> Benzene 527 0 50 ugll 5 00 ND 105 81-118 <br /> Ethylbenzene 544 050 5 00 ND 109 89-122 <br /> Methyl tert-butyl ether 595 050 5 00 0 50 109 77-123 <br /> Toluene 505 050 5 00 ND 101 84-119 <br /> Xylenes(total) 16 2 0 50 15 0 ND 108 86-132 <br /> Surrogate Dibromofluoromethane 489 500 98 84-121 <br /> Surrogate 1 2-Dtchloroethane-d4 4 98 500 100 74-135 <br /> Surrogate Toluene-d8 438 500 88 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 he reproduced in its entirety <br /> Page 16 of 23 <br />