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6JaDrive <br /> rvisSequoia Morgan Hill CA 95037 <br /> (408)776 9600 <br /> FAX <br /> Analytical -wwseq 8)782 6308 <br /> www uoralabs coin <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 Hi❑ <br /> Reporting Spike Source %REC RPD <br /> Anatyte Result L=it Units level Result %REC UMILS RPD Llmi[ Notes <br /> Batch 4G21002-EPA 5030B P/T <br /> Laboratory Control Sample(4G21002-BS2) Prepared&Analyzed 07/21/04 <br /> Gasoline Range Organics(C4-C 12) 376 50 ugll 440 85 70-124 <br /> Surrogate I 1-Drchloroethane-d4 380 " 5 00 76 78-119 LG <br /> Laboratory Control Sample Dup(4G21002-BSD1) Prepared&Analyzed 07/21/04 <br /> tert-Amyl methyl ether 107 050 ug/1 100 107 82-140 6 20 <br /> Benzene 105 050 100 105 69 124 3 20 <br /> tent-Butyl alcohol 474 20 500 95 56-131 8 20 <br /> Di-tsopropyl ether 107 050 IOU 107 76-130 2 20 <br /> 1,2-Dibromocthane(EDB) 120 050 IOU 120 77-132 11 20 <br /> 1,2-Drchloroethane 112 050 100 112 77-136 3 20 <br /> Ethanol 193 100 200 96 31-143 3 20 <br /> hyl tent-butyl ether 11 1 050 i' IOU 111 81-121 3 20 <br /> hylbenzene 972 050 IOU 97 84-132 6 20 <br /> Methyl tert-butyl ether 112 050 IOU 112 63-137 6 20 <br /> Toluene 100 050 100 100 78-129 6 20 <br /> Xylenes(total) 274 050 300 91 83-137 7 20 <br /> Surrogate 12-Dichloroethane-d4 533 500 107 78-129 <br /> Matnx Spike(4G21002-MSl) Source MNG0371-04 Prepared&Analyzed 07/21/04 <br /> Benzene 863 50 ug/1 640 19 105 69-124 <br /> Ethylbenzene 129 50 696 44 122 84 132 <br /> Methyl tert-butyl ether 377 50 992 250 128 63-137 <br /> Toluene 437 50 297 58 128 78-129 <br /> Xylenes(total) 962 50 337 570 116 83 137 <br /> Gasoline Range Organics(C4-C 12) 7800 500 4400 3100 107 70-124 <br /> Surrogate 12-Dichloroethane-d4 585 500 117 78-119 <br /> Matnx Spike Dup(4G21002-MSDI) Source MNG0371-04 Prepared&Analyzed 07/21/04 <br /> Benzene 791 50 ug/1 640 19 94 69-124 9 20 <br /> Ethylbenzene 125 50 696 44 116 84-132 3 20 <br /> Methyl tent-butyl ether 378 50 992 250 129 63-137 03 20 <br /> Toluene 445 50 297 58 130 78-129 2 20 LM <br /> I <br /> Xylenes(total) 917 50 337 570 103 83 137 5 20 <br /> Gasoline Range Organics(C4-C 12) 7350 500 4400 3100 97 70-124 6 20 <br /> Surrogate 12-Drchloroethane-d4 587 500 117 78-129 <br /> 4Vquoia 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 />