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1885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 9600 <br /> (408)776 4600 <br /> FAX(408)782-6308 <br /> Analytical www sequoialabs com <br /> URS Corporation[Arcot] Pr4ject ARCO#6100 Tracey CA MOF0491 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC IY-0003/7 Reported <br /> Sacramento CA,95833 Project Manager,lay Johnson 06/17/05 16 37 <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 5F16009-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample(5F16009-BSI) Prepared&Analyzed 06/16/05 <br /> tort-Amyl methyl ether 107 050 mg/ml Air 100 107 80-115 <br /> Benzene 9 91 050 10 0 99 65-115 <br /> tert-Butyl alcohol 506 20 500 1 0 1 75-150 <br /> Dt-isopropyl ether 104 0 50 100 104 75-125 <br /> Ethyl Cert-butyl ether 990 0 50 100 99 75-130 <br /> Ethylbenzene 942 050 100 94 75-135 <br /> Methyl tert-butyl ether 932 050 100 93 65-125 <br /> Toluene 986 050 100 99 85-120 <br /> Xylenes(total) 313 050 300 104 85-125 <br /> Surrogate I 1-Dichloroethane-d4 406 500 81 60-135 <br /> laboratory Control Sample(SF16009-BS2) Prepared&Analyzed 06/16/05 <br /> nzene 539 050 mg/m'Air 6 09 89 65-115 <br /> Ethylbenzene 758 050 7 84 97 75-135 <br /> Methyl tert-butyl ether 838 050 960 87 65-125 <br /> Toluene 350 0 50 329 106 85-120 <br /> Xylenes(total) 452 0 50 38 5 117 85-125 <br /> Gasoline Range Organics(C4-C12) 394 50 440 90 70-124 <br /> Surrogate 1 1-Drchloroethane-d4 450 5 00 90 60-135 <br /> Laboratory Control Sample Dup(5F16009-ESDI) Prepared&Analyzed 06/16/05 <br /> tert-Amyl methyl ether 106 0 50 mg/ml Air 100 106 80 115 09 15 <br /> Benzene 10 9 050 10 0 109 65-115 10 20 <br /> tert-Butyl alcohol 530 20 500 106 75-150 5 25 <br /> Di-isopropyl ether 104 0 50 100 104 75-125 0 15 <br /> Ethyl tert-butyl ether 10 0 050 100 100 75-130 1 25 <br /> Ethylbenzene 10 2 050 100 102 75-135 8 15 <br /> Methyl tert butyl ether 996 050 100 100 65-125 7 20 <br /> Toluene 10 6 050 100 106 85-120 7 20 <br /> Xylenes(total) 334 050 300 111 85-125 6 20 <br /> Surrogate 11-Drchloroethane-d4 443 500 89 60-135 <br /> Sequoia Analytical-Morgan Hill The results to 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 /> 0 This analyrtcal report must be reproduced in its entirety <br /> Page 13 of 15 <br />