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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> a— ) <br /> W Analytical FAX(707)792-1865 <br /> (707)792-0342 <br /> www scquolalabs com0 <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P403078 <br /> 3017 Kilgare 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 -Qualify 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 4030422-EPA 5030B waters <br /> Blank(4030422-BLKI) Prepared&Analyzed 03/16/04 <br /> Benzene ND 050 ugll <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 5 45 5 00 109 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 6 03 500 121 74-135 <br /> Surrogate Toluene-d8 447 500 89 84-119 <br /> Laboratory Control Sample(4030422-BS1) Prepared&Analyzed 03/16/04 <br /> Benzene 5 37 050 ug/I 5 00 107 81-118 <br /> Ethylbenzene 5 56 050 5 00 111 89 122 <br /> Methyl Cert-butyl ether 5 00 050 500 100 77-123 <br /> Toluene 5 26 050 500 105 84-119 <br /> Xylenes(total) 167 050 ISO 111 86-132 <br /> Surrogate Dibromofluoromethane 469 5 00 94 84-122 <br /> Surrogate 12-Dichloroethane-d4 4 85 5 00 97 74-135 <br /> Surrogate Toluene-d8 4 48 500 90 84-119 <br /> Laboratory Control Sample Dup(4030422-BSD1) Prepared&Analyzed 03/16/04 <br /> Benzene 5 32 050 ug/1 500 106 81 118 0 9 20 <br /> Ethylbenzene 5 33 050 5 00 107 89 122 4 20 <br /> Methyl text-butyl ether 5 82 050 5 00 1 l6 77-123 15 20 <br /> Toluene 498 050 5 00 100 84-119 5 20 <br /> Xylenes(total) 164 050 15 0 109 86-132 2 20 <br /> Surrogate Drbromofluoromethane 521 500 104 84-122 <br /> Surrogate 1 2-Dichloroethane-4`4 552 500 110 74-135 <br /> Surrogate Toluene-d8 4 42 500 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 be reproduced in its entirety 0 <br /> Page 20 of 23 <br />