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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> a— ) <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs co <br /> � <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P402158 <br /> 3017 Kilgare Road Suite 100 Protect]Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/20/04 12 06 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> INF(P402158-04)Water Sampled 02/04/041050 Received 02/04/0414 55 <br /> Benzene 260 250 ug/l 500 4020358 02/17/04 02/17/04 EPA 8260B <br /> Ethylbenzene ND 250 " <br /> Methyl tert-butyl ether 23000 250 " <br /> Toluene 770 250 " <br /> Xylenes(total) 890 250 " <br /> Surrogate Dibromofluoromethane 98% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 98% 74-135 " <br /> Surrogate Toluene-d8 87% 84-119 " IF <br /> MtD-1 (P402158-05)Water Sampled 02/04/0410 40 Received 02/04/0414 55 <br /> Benzene ND 050 ug/1 1 4020276 02/11/04 02/12/04 EPA 8260B <br /> Ethylbenzene ND 050 " " " IF <br /> " " <br /> Methyl tert-butyl ether ND 050 IF " " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 104% 84-122 " IF IF <br /> Surrogate 12-Dichloroethane-d4 106% 74-135 " <br /> Surrogate Toluene-d8 89% 84-119 " <br /> MID-2(P402158-06)Water Sampled 02/04/04 10 35 Received 02/04/04 14 55 <br /> Benzene ND 050 ug/1 1 4020278 02/11/04 02/12/04 EPA 8260B <br /> Ethylbenzene ND 050 IF " " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 IF IF " <br /> Surrogate Dibromofluoromethane 105% 84-122 IF IF <br /> Surrogate 11-Dichloroethane-d4 104% 74-135 IF IF " IF <br /> Surrogate Toluene-d8 96% 84-119 11 IF " " <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 0 <br /> Page 6 of 18 <br /> I <br />