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Drive <br /> 885 <br /> Sequoia Morgan Hill <br /> CA CA 950375037 <br /> (408)776-9600 <br /> FAX► Analytical wwsegaialabs;jos <br /> www sequwalabs com <br /> URS Corporation(ArcoI l Project ARCO#2130,Stockton,CA MOL0602 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOBZK-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/04/06 16 OI <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 5L22002-EPA 50305 PIT/EPA 8260B <br /> Matrix Spike Dup(5L22002-MSDI) Source MOL0602-08 Prepared&Analyzed 12/22/05 <br /> tert-Amyl methyl ether 392 2 5 ugll 376 ND 104 80 115 1 15 <br /> Benzene 160 25 129 0 90 117 65 115 7 20 HL <br /> tert-Butyl alcohol 375 25 358 ND 105 75 120 6 25 <br /> Di-isopropyl ether 475 25 378 ND 126 75-125 5 15 LM <br /> 12 Dichloroethane 504 25 368 080 135 85-130 9 20 LM <br /> Ethanol 150 500 354 ND 42 70 135 47 35 HM,BA,IC <br /> Ethyl tert-butyl ether 424 2 5 376 ND 113 75 130 2 25 <br /> Ethylbenzenc 61 8 2 5 188 46 84 75 135 4 15 <br /> Methyl tert butyl ether 21 5 25 176 23 109 65 125 2 20 <br /> Toluene 106 25 930 ND 114 85-120 6 20 <br /> Xylenes(total) 210 25 103 120 87 85-125 7 20 <br /> �solme Range Organics(C4 C12) 7950 250 1100 8500 0 60-140 7 25 BB,LN <br /> 'qMlarrogate 12 Dichloroethane-d4 256 150 101 60-135 <br /> Batch 5L22023-EPA 5030B PIT/EPA 8260B <br /> Blank(5L22023-BLKI) Prepared 12/22/05 Analyzed 12/23/05 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 0 50 <br /> tert-Bury]alcohol ND 20 <br /> Di-tsopropyl ether ND 050 " <br /> 1,2-Drchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 <br /> Ethylbenzene ND 050 " <br /> Methyl tert butyl ether ND 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 0 50 <br /> Gasoline Range Organics(C4 C12) ND 50 <br /> Surrogate 11-Drchloroethane d4 5 19 500 106 60 135 <br /> Sequoia Analytical-Morgan Bill The results to thrs report apply to the samples analyzed in accordance with the churn of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced m its entirety <br /> Page 21 of 28 <br />