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Drive <br /> Sequoia 885 CA 95037 <br /> a— ) Morgan Hill,CA 95077 <br /> Analytical FAX(408)782 <br /> 9600 <br /> iW (408)782 6308 <br /> WWW sequoialabs c0 <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 /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4010453-EPA 5030B waters <br /> Laboratory Control Sample(4010453-BSI) Prepared&Analyzed 0112_4/04 -� <br /> Xylenes(total) 279 050 u94 300 93 86-132 <br /> Surrogate Dibromofluoromethane 434 450 96 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 410 450 91 74-135 <br /> Surrogate Toluene d8 443 450 98 84-119 <br /> Surrogate 4-Bromofluorobenzene 436 450 97 86-119 <br /> Matrix Spike(4010453-MS1) Source P401281-03RE1 Prepared&Analyzed 01/24/04 <br /> Tert-amyl methyl ether 0 938 10 ug/l 100 ND 94 78-117 <br /> Benzene 0 943 050 1 00 ND 94 81-118 <br /> Tert-butyl alcohol 175 20 200 ND 88 60-147 <br /> Di-isopropyl ether 0 984 10 1 00 ND 98 70-125 <br /> 1,2-Dibromoethane(EDB) 0 998 050 1 00 ND 100 85-125 <br /> 1,2-Dichloroethane 1 23 050 1 00 028 95 77-126 <br /> Ethanol 15 6 100 200 ND 78 55-200 <br /> Ethylbenzene 0 914 0 50 1 00 ND 91 89-122 <br /> Ethyl tert-butyl ether 0 917 1 0 1 00 ND 92 71-120 <br /> Methyl tert-butyl ether 0 949 0 50 " 100 ND 95 70-122 <br /> Toluene 0 943 0 50 100 ND 94 84-119 <br /> Xylenes(total) 289 050 300 ND 96 86-132 <br /> Surrogate Dibromofluoromethane 426 450 95 84-112 <br /> Surrogate 1 2-Dichloroethane-d4 417 450 93 74-135 <br /> Surrogate Toluene-d8 440 450 98 84-119 <br /> Surrogate 4-Bromofluorobenzene 442 450 98 86-119 <br /> Matrix Spike Dup(4010453-MSD1) Source P401281-03RE1 Prepared&Analyzed 01/24/04 <br /> Tert-amyl methyl ether 0 948 1 0 uSA t 00 ND 95 78-117 1 20 <br /> Benzene 0 965 050 l 00 ND 96 81-118 2 20 <br /> Tert-butyl alcohol 22 5 20 200 ND 112 60-147 25 20 QR-02 <br /> Dr-isopropyl ether 0 956 1 0 100 ND 96 70-125 3 20 <br /> 1,2-Dibromoethane(EDB) 1 04 0 50 100 ND 104 85-125 4 20 <br /> 1,2-Dichloroethane 1 20 0 50 1 00 028 92 77-126 2 20 <br /> Ethanol 382 100 200 ND 191 55-200 84 20 QR-02 <br /> Ethylbenzene 0 961 0 50 1 00 ND 96 89-122 5 20 <br /> Ethyl tert-butyl ether 0 900 1 0 1 00 ND 90 71-120 2 20 <br /> Methyl tert-butyl ether 0 936 050 1 00 ND 94 70-122 1 20 <br /> Toluene 0 938 0 50 100 ND 94 84-119 0 5 20 <br /> Xylenes(total) 2 81 0 50 300 ND 94 86-132 3 20 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> ojoastody 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 28 of 30 <br />