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8Hi Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> (408)776 9600 <br /> FAX(408)782 6308 <br /> 1W Analytical www sequoislabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNG0371 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/03/04 16 21 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Urnit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4G21002-EPA 5030B PIT <br /> Laboratory Control Sample(4G21002-BS2) Prepared&Analyzed 07/21/04 <br /> Gasoline Range Organics(C4 C12) 376 50 ug/l 440 85 70 124 <br /> Surrogate I 1-Dichloroethane-d4 380 500 76 78 119 LG <br /> Laboratory Control Sample Dup(4G21002-BSD1) Prepared&Analyzed 07/21/04 <br /> ter[Amyl methyl ether 107 050 ug/l 100 107 82-140 6 20 <br /> Benzene 105 050 100 105 69 124 3 20 <br /> cert-Butyl alcohol 47 4 20 500 95 56 131 8 20 <br /> Di isopropyl ether 107 050 j 0 0 107 76-130 2 20 <br /> 1,2 Dibromoethane(EDB) 12 0 050 " 100 120 77-132 11 20 <br /> 1,2 Dichloroethane 11 2 050 100 112 77-136 3 20 <br /> Ethanol 193 100 200 96 31-143 3 20 <br /> 0 Ethyl tert butyl ether it 1 050 n 100 111 81-121 3 20 <br /> Ethylbenzene 972 0 50 100 97 84-132 6 20 <br /> Methyl tert-butyl ether 112 0 50 100 112 63-137 6 20 <br /> Toluene 100 050 100 100 78 129 6 20 <br /> Xylenes(total) 27 4 050 300 91 83-137 7 20 <br /> Surrogate 11 Dichloroethane-d4 533 500 107 78-119 <br /> M_atrtx Spike(4G21002-MSI) Source MNG0371-04 Prepared&Analyzed 07/21/04 <br /> Benzene 963 5 0 us/1 640 19 105 69-124 <br /> Ethylbenzene 129 5 0 696 44 122 84-132 <br /> Methyl tent-butyl ether 377 5 0 992 250 128 63-137 <br /> Toluene 437 5 0 297 58 128 78-129 <br /> Xylenes(total) 962 5 0 337 570 116 83 137 <br /> Gasoline Range Organics(C4 C12) 7800 500 4400 3100 107 70-124 <br /> Surrogate 1 1-Dichloroethane-d4 S 85 500 117 78-119 <br /> Matrix Spike Dup(4G21002-MSD1) Source MNG0371-04 Prepared&Analyzed 07/21/04 <br /> Benzene 791 5 0 ug11 64 0 19 94 69-124 9 20 <br /> Ethylbenzene 125 5 0 696 44 116 84-132 3 20 <br /> Methyl tert butyl ether 378 5 0 992 250 129 63-137 0 3 20 <br /> Toluene 445 5 0 297 58 130 78-129 2 20 LM <br /> Xylenes(total) 917 5 0 337 570 103 83 137 5 20 <br /> Gasoline Range Organics(C4-C 12) 7350 500 4400 3100 97 70-124 6 20 <br /> Surrogate 1 1-Dichloroethane-d4 587 500 117 78-119 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with 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 entirety <br /> Page 16 of 24 <br />