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Sequoia 1455 McDowell Blvd,North Ste D <br /> PctalumiI6 CA 94954 <br /> Analytical 111—W (7D7)7920345 <br /> FAX(707)792 0342 <br /> www sequoialabs com <br /> URS Carp-Sacramento Project Arco Site 2093,Tracy,CA P503073 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/16/05 14 19 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limn Units Level Result "/oREC Limits RPD Limit Notes <br /> Batch 50301:47-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(5030147-MSI) Source P503066-02 Prepared&Analyzed 03/14/05 <br /> Tert-amyl methyl ether 495 100 ug/l 500 ND 99 78-117 <br /> Benzene 2140 50 " 500 1600 108 81-118 <br /> Tert-butyl alcohol 9340 2000 10000 ND 93 60-147 <br /> Di-isopropyl ether 497 100 500 ND 99 70-125 <br /> 1 2-Dibromoethane(EDB) 490 50 500 ND 98 85-125 <br /> 1,2-Dichloroethane 458 50 500 ND 92 77-126 <br /> Ethanol 13400 10000 10000 ND 134 55-200 <br /> Ethylbenzene 2780 50 500 2200 116 89-122 <br /> Ethyl tert-butyl ether 490 100 500 ND 98 71-120 <br /> Methyl tert butyl ether 800 50 500 310 98 70-122 <br /> Toluene 730 5o 500 280 90 84-119 <br /> Xylenes(total) 5850 50 1500 4300 103 86-132 <br /> urrogate Dibromofluoromethane 5 15 5 00 103 84-122 <br /> Surrogate 12-Drchloroethane-d4 537 500 107 74-135 <br /> Surrogate Toluene-d8 522 500 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 547 500 109 86-119 <br /> Matrix Spike Dup(5030147-MSDI) Source P503066-02 Prepared&Analyzed 03/14/05 <br /> Tert-amyl methyl ether 477 100 ug/l 500 ND 95 78-117 4 20 <br /> Benzene 2100 50 500 1600 100 81-118 2 20 <br /> Tert-butyl alcohol 9250 2000 10000 ND 92 60-147 1 20 <br /> Di-isopropyl ether 478 100 500 ND 96 70-125 4 20 <br /> 1,2-D[bromoethane(EDB) 472 50 500 ND 94 85-125 4 20 <br /> 1,2-Vichloroethane 443 50 500 ND 89 77-126 3 20 <br /> Ethanol 14300 10000 10000 ND 143 55-200 6 20 <br /> Ethylbenzene 2720 SO 500 2200 104 89-122 2 20 <br /> Ethyl tert-butyl ether 471 100 500 ND 94 71-120 4 20 <br /> Methyl tert-butyl ether 776 50 500 310 93 70-122 3 20 <br /> Toluene 708 50 500 280 86 84-119 3 20 <br /> Xylenes(total) 5730 50 1500 4300 95 86-132 2 20 <br /> Surrogate Dibromofluoromethane 5 13 5 00 103 84-122 <br /> Surrogate 1 1-Drchloroethane-d4 529 5 00 106 74-135 <br /> Surrogate Toluene-d8 524 5 00 105 84-119 <br /> Surrogate 4-Bromofluorobenzene 542 500 108 86-119 <br /> Sequoia Analytical -Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise slated restyles are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 16 of 19 <br />