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ve <br /> Sequoia 885JarvisC is 5037 <br /> Morgan Hill CA 95037 <br /> (40 )776-9600 <br /> Analytical FAX(4089)782 6308 <br /> . www sequoialabs com <br /> URS Corporation[Arco I Project ARCO#5469,Stockton,CA MPF0114 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOBZP-0010 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 06/30/06 11 12 <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 Nates <br /> Batch 6FO7022- EPA 5030B Pff/EPA 826013 <br /> Matrix Spike(61707022-MS1) Source MPFO114-04 Prepared 06/07/06 Analyzed 06/08/06 <br /> Cert-Amyl methyl ether 149 50 ugll 150 ND 99 65-135 <br /> Benzene 50 l 50 51 6 ND 97 70-125 <br /> tert Butyl alcohol 1780 200 1430 67 120 60-135 <br /> Di-isopropyl ether 145 50 151 ND 96 70-130 <br /> 1 2 Dibromoethane(EDB) 162 50 149 ND 109 85-125 <br /> 1 2 Dtchloroethane 146 50 147 ND 99 75-125 <br /> Ethanol 1650 3000 1420 ND 116 15-150 <br /> Ethyl tett-butyl ether 150 50 150 ND 100 65-130 <br /> Ethylbenzene 720 50 754 ND 95 80-130 <br /> Methyl Cert butyl ether 1050 50 702 970 114 50-140 BB LM EY <br /> Toluene 382 50 372 ND 103 70-120 <br /> lenes(total) 414 50 412 ND 100 85-125 <br /> soline Range Organics(C4-C12) 5040 500 4400 850 95 75-140 <br /> Surrogate 12 Dtchloroethane d4 4 72 5 00 94 60-145 <br /> Surrogate Toluene-d& 495 500 99 70-130 <br /> Surrogate Dibromofluoromethane 455 500 91 75-130 <br /> Surrogate 4 Bromofluorobenrene 464 " 500 93 60-115 <br /> Matrix Spike Dup(6FO7022-M_S_D_1)__ Source MPF0114-04 _ Prepared 06/07/06 Analyzed 0610810.6_ _ <br /> tert Amyl methyl ether 151 50 ug/I 150 4 ND 101 65-135 1 25 <br /> Benzene 505 50 51 6 ND 98 70-125 08 15 <br /> tert-Butyl alcohol 1780 200 1430 67 120 60-135 0 35 <br /> Di-isopropyl ether 136 50 151 ND 90 70-130 6 35 <br /> 1 2-Dibromoethane(EDB) 160 50 149 ND 107 85-t25 1 15 <br /> 1 2 Dichloroethane 144 5 0 147 ND 98 75-125 1 10 <br /> Ethanol 1560 3000 1420 ND 110 15-150 6 35 <br /> Ethyl ten-butyl ether 146 5 0 150 ND 97 65-130 3 35 <br /> Ethylbenzene 763 5 0 75 4 ND 101 80-130 6 15 <br /> Methyl tert-butyl ether 985 5 0 702 970 21 50-140 6 25 BB LM EY <br /> Toluene 365 50 372 ND 98 70-120 5 15 <br /> Xylenes(total) 421 50 412 ND 102 85-125 2 t5 <br /> Gasoline Range Organics(C4-C12) 4950 500 4400 850 93 75-140 2 20 <br /> Surrogate 12 Dichloroethane-d4 460 500 92 60-145 <br /> Surrogate Toluene-d8 456 500 91 70-130 <br /> Surrogate Dibromofluoromethane 4 50 500 90 75-130 <br /> Surrogate 4-Bromof7uoroben_ene 464 500 93 60-115 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed to 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 15 of 20 <br />