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(D (40885 larvas Drive <br /> Sequoia Morgan Hill CA 95037 <br /> Analytical FAx <br /> 9)776 9600 <br /> (408)792-6308 <br /> www sequoialabs corn <br /> URS Corporation[Arcot] Project ARCO#6020,Manteca,CA MOL0445 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOCI V-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/29/05 17 44 <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 5L21004-EPA 5030B PIT/EPA 8260B <br /> Matrix Spike(51,21004-MSI) Source MOL0535-01 Prepared&Analyzed 12/21105 <br /> tert-Amyl methyl ether 369 25 ug/I 376 1 7 94 80-115 <br /> Benzene 12 8 2 5 12 9 ND 99 65-115 <br /> tent-Butyl alcohol 528 25 358 170 100 75-120 <br /> Di-isopropyl ether 404 2 5 378 ND 107 75 125 <br /> 1,2-Dibromoethane(EDB) 42 0 2 5 372 ND 113 85 120 <br /> 1,2-Dichloroethane 37 1 25 368 ND 101 85-130 <br /> Ethanol 464 500 354 ND 131 70-135 <br /> Lthyl tert-butyl ether 35 9 25 376 ND 95 75-130 <br /> Ethylbenzene 168 25 18 8 ND 89 75-135 <br /> Methyl tert-butyl ether 182 2 5 176 180 11 65 125 BB,LN <br /> Toluene 873 2 5 93 0 ND 94 85 120 <br /> lenes(total) 933 2 5 103 ND 91 85-125 <br /> asolme Range Organics(C4-C12) 1170 250 1100 260 83 60-140 <br /> Surrogate 12-Dichloroethane d4 4 73 500 95 60-135 <br /> Matrix Spike Dup(5L21004-MSDI) Source MOL0535-01 Prepared&Analyzed 12/21/05 <br /> tert-Amyl methyl ether 368 25 ug/l 37 6 1 7 93 80-115 0 3 15 <br /> Benzene 126 2 5 12 9 ND 98 65-115 2 20 <br /> tert-Butyl alcohol 533 25 358 170 101 75-120 0 9 25 <br /> Di-isopropyl ether 409 2 5 379 ND 108 75-125 1 15 <br /> 1,2-Dibromoethane(EDB) 408 2 5 372 ND 110 85-120 3 15 <br /> 1 2-Dichloreethane 374 2 5 369 ND 102 85-130 0 8 20 <br /> Ethanol 335 500 354 ND 95 70-135 32 35 <br /> Ethyl tert-butyl ether 357 2 5 376 ND 95 75-130 0 6 25 <br /> Ethylbenzene 174 2 5 188 ND 93 75-135 4 15 <br /> Methyl tert-butyl ether 180 2 5 176 180 0 65 125 1 20 13B,LN <br /> Toluene 898 2 5 930 ND 97 85-120 3 20 <br /> Xylenes(total) 95 6 2 5 103 ND 93 85-125 2 20 <br /> Gasoline Range Organics(C4-C 12) 1 190 250 1 100 260 85 60-140 2 25 <br /> Surrogate 1 1-Dtchloroethane d4 4 57 500 91 60-135 <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 1 I of 12 <br />