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8 95 Jarvis Dr <br /> Sequoia Morgan(O$)�6995037 <br /> 600 <br /> IW Analytical FAX(408)7826308 <br /> www sequoialabs cam <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNG0370 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/20/04 09 33 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result limit Units Level Result %REC Limits RPD limit Notes <br /> Batch 4G19006-EPA 5030B PIT <br /> Laboratory Control Sample(4G19006-BS1) Prepared&Analyzed 07/19/04 <br /> Toluene 960 050 ug/l 100 96 78 129 <br /> Xylenes(total) 32 3 050 300 108 83-137 <br /> Surrogate I 1-Dichloroethane-d4 518 500 106 78-129 <br /> Laboratory Control Sample(4G 19006-BS2) Prepared&Analyzed 07/19/04 <br /> Benzene 560 0 50 ug11 640 88 69-124 <br /> Ethylbenzene 807 050 6 96 116 84-132 <br /> Methyl tert-butyl ether 846 050 992 85 63-137 <br /> Toluene 31 9 050 297 107 78-129 <br /> Xylenes(total) 403 050 33 7 120 83-137 <br /> Gasoline Range Organics(C4-C 12) 475 50 440 108 70-124 <br /> Surrogate 12-Dichloroelhane-d4 4 93 Soo 99 78-119 • <br /> Laboratory Control Sample Dup(4G19006-13SD1) Prepared&Analyzed 07/19/04 <br /> tert-Amyl methyl ether 9 16 050 ug/t l0 0 92 82-140 3 20 <br /> Benzene 965 050 10 0 96 69-124 8 20 <br /> tert-Butyl alcohol 52 3 20 50 0 105 56-131 2 20 <br /> Di-isopropyl ether 107 0 50 100 107 76-130 0 20 <br /> 1 2-Dibromoethane(EDB) 113 050 100 113 77-132 0 20 <br /> 1,2-Dichloroethane 108 0 50 100 108 77-136 0 20 <br /> Ethanol 212 100 200 106 31-143 5 20 <br /> Ethyl tert-butyl ether 966 050 " 100 97 81-121 3 20 <br /> Ethylbenzene 10 7 0 50 100 107 84-132 4 20 <br /> Methyl ter[butyl ether 881 0 50 100 88 63-137 4 20 <br /> Toluene 9 92 050 10 0 99 78-129 3 20 <br /> Xylenes(total) 329 0 50 300 110 83-137 2 20 <br /> Surrogate 1 2-Dichloroelhane-d4 4 71 Soo 94 78-129 <br /> Sequoia Analytical-Morgan Hill The results to this report apply to the samples analyzed in accordance wrth the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entzrety 0 <br /> Page 8 of 11 <br />