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885 Jarvis D'ive <br /> Sequoia Morgan H01 CA 95037 <br /> (408)776 9600 <br /> Analytical <br /> FAX(408) 6306 <br /> cq <br /> WWW suoialaalahs corn <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNA0375 <br /> 3017 Kilgore Rd Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/28/04 16 50 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Repotting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4010397-EPA 5030B waters <br /> Laboratory Control Sample Du (4010397-BSDI Prepared&Anal zed 01/21/04 <br /> Surrogate Dibromofluoromethane 646 ug/1 600 108 84-111 <br /> Surrogate 1,2-Dichloroethane-d4 608 600 101 74-135 <br /> Surrogate Toluene-d8 666 600 111 84-119 <br /> Surrogate 4-Bromofluorobenzene 632 600 105 86-119 <br /> Batch 4010453-EPA 5030B waters <br /> Blank 4010453-BLK1 Pre ared&Analyzed 01/24/04 <br /> Tert-amyl methyl ether ND 1 0 u9/1 <br /> Benzene ND 0 50 " <br /> Tort-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> • 1,2-Dibromoethane(EDB) ND 0 50 <br /> 1,2-Dichloroethane ND 0 50 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 423 450 94 84-112 <br /> Surrogate 1 2-Dichloroethane-d4 412 450 94 74-135 <br /> Surrogate Toluene-d8 446 4 50 99 84-119 <br /> Surrogate 4-Bromoi%orobenzene 437 450 97 86-119 <br /> Laboratory Control Sample(4010453-BS1) Prepared&Analyzed 01/24/04 <br /> Tert-amyl methyl ether 0 899 1 0 ugll 1 00 90 78-117 <br /> Benzene 0 932 0 50 1 00 93 81-118 <br /> Tert-butyl alcohol 19 3 20 200 96 60-147 <br /> Di-isopropyl ether 0 978 1 0 " 1 00 98 70-125 <br /> 1,2-Dibromoethane(EDB) 1 00 050 1 00 100 85-125 <br /> 1,2-Dichloroethane 0 944 0 50 1 00 94 77 126 <br /> Ethanol 990 100 200 495 55-200 Q-LIM <br /> Ethylbenzene 0 913 050 1 00 91 89-122 <br /> Ethyl tent-butyl ether 0 867 1 0 1 00 87 71-120 <br /> Methyl Cert-butyl ether 0 913 0 50 1 00 91 70-122 <br /> Toluene 0 968 050 100 97 84-119 <br /> Sequoia Analytical-Morgan Hill 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 27 of 30 <br />