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Sequoia 1455 McDowell Blvd, North Ste <br /> Petaluma CA 949544 <br /> a_ _� � <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> l� www sequoialabs com <br /> Secor-Rancho Cordova Protect Arco Site 4932,Stockton,CA P307150 <br /> 3017 Kilgare Road Suite 100 Protect Number 38984 Reported <br /> Rancho Cordova CA,95670 Protect Manager Rusty Benkosky 07/23/03 16 39 <br /> Volatile Organic Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit amts Level Result %REC Limits RPD Limn Notes <br /> Batch 3070377-EPA 5030 waters <br /> Blank 3070377-BLKI Prepared&Anal zed 07/18/03 <br /> Benzene ND 0 50 ugll <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibroma luoromethane 535 500 107 84 112 <br /> Surrogate 1 2-Dichloroethane-0 5 16 500 103 74-135 <br /> Surrogate Toluene-d8 S 13 500 103 84-119 <br /> Laboratory Control Sample(3070377-BSI) Prepared&Analyzed 07/18/03 <br /> Benzene 5 16 050 ug/1 5 00 103 81-118 <br /> ethyl tcrt-butyl ether 544 050 " 500 109 77-123 <br /> oluene 5 37 050 5 00 107 84-119 <br /> Surrogate Dibromofluoromethane 555 500 111 84-122 <br /> Surrogate 12-Dichloroethane-d4 536 500 107 74-135 <br /> Surrogate Toluene-d8 495 5 00 99 84-119 <br /> Matrix Spike(3070377-MS]) Source P307150-05 Prepared&Analyzed 07/18/03 <br /> Benzene 565 0 50 119/1 5 00 ND 113 81-118 <br /> Methyl tert-butyl ether 5 52 050 5 00 ND 110 77-123 <br /> Toluene 599 0 50 500 ND 120 84-119 Q-LIM <br /> Surrogate Dibromofluoromethane 353 500 111 84-1.22 <br /> Surrogate 1 2-Dlchlaroethane-d4 537 500 107 74-135 <br /> Surrogate Toluene-d8 524 " 500 105 84-119 <br /> Matrix Spike Du 3070377-MSDI Source P307150-05 Pre ared&Analyzed 07/18/03 <br /> Benzene 5 54 0 50 ug/1 500 ND 111 81-118 2 20 <br /> Methyl tert-butyl ether 543 050 500 ND 109 77-123 2 20 <br /> Toluene 5 80 0 50 500 ND 116 84-119 3 20 <br /> Surrogate Dibromofluoromethane 537 Soo 107 84-122 <br /> Surrogate 12-Dichloroethane-d4 521 S 00 104 74-135 <br /> Surrogate Toluene-d8 5 10 500 101 84-119 <br /> e <br /> quota Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> ofeustody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 12 of 16 <br />