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885]aids DriVe <br /> s <br /> la Morban Hill CA 95037 <br /> (408)776 9600S uo- FAX 782 63 a - Ana yfcal www sequotalahs coin <br /> Project BP Hentage#I 1194,Tracy,CA MPA1469 <br /> URS Corporation[Arco]� <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G07WZ-0011 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/13/06 15 39 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyto Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6BO9004-EPA 5030B P/T/EPA 8260B <br /> Laboratory Control Sample(6B09004-BSI) Prepared&Analyzed 02/09/06 <br /> tert-Amyl methyl ether 162 050 ug/l 163 99 80-115 <br /> Benzene 478 050 504 95 65-115 <br /> tert-Butyl alcohol 145 20 169 86 75-150 <br /> DL-isopropyl ether 15 5 050 16 2 96 75-125 <br /> Ethanol 162 300 165 98 70-135 <br /> Ethyl tert-butyl ether 159 0 50 16 4 97 75-130 <br /> Ethylbenzene 673 0 50 728 92 75-135 <br /> Methyl ten-butyl ether 7 32 0 50 7 84 93 65-125 <br /> Toluene 392 050 38 0 103 85-120 <br /> Xylenes(total) 41 0 050 408 100 85-125 <br /> Gasoline Range Organics(C4-C12) 371 50 440 84 60-140 <br /> Wurroguie 12-Dichloroethane-d4 458 500 92 60-135 <br /> atrix Spike(61309004-MSI) Source MPA1470-02 Prepared&Analyzed 02/09/06 <br /> tert-Amyl methyl ether 87 9 2 5 ug/l 816 to 106 80-115 <br /> Benzene 25 1 2 5 252 16 93 65-115 <br /> Cert Butyl alcohol 879 300 844 66 96 75 120 <br /> Di-isopropyl ether 81 4 2 5 81 2 16 98 75-125 <br /> Ethanol 861 1500 824 ND 104 70-135 <br /> Ethyl tert-butyl ether 826 2 5 82 0 1 0 l00 75-130 <br /> Ethylbenzene 332 2 5 36 4 1 8 86 75-135 <br /> Methyl tent-butyl ether 254 2 5 39 2 220 87 65-125 <br /> Toluene 205 2 5 190 16 107 85-120 <br /> Xylenes(total) 206 2 5 204 5 8 98 85-125 <br /> Gasoline Range Organics(C4-C 12) 2080 250 2200 250 83 60-140 <br /> Surrogate 12 Dichloroethane-d4 4 89 500 98 60-135 <br /> Matrix Spike Dup(6809004-MSDI) Source MPA1470-02 Prepared&Analyzed 02/09/06 <br /> tert Amy]methyl ether 87 5 2 5 ug/l 816 10 106 80-115 0 5 15 <br /> Benzene 25 l 2 5 25 2 16 93 65-115 0 20 <br /> tert-Butyl alcohol 865 100 844 66 95 75-120 2 25 <br /> Di isopropyl ether 822 2 5 812 t 6 99 75-125 l 15 <br /> Ethanol 821 1500 824 ND 100 70-135 5 35 <br /> Ethyl tert-butyl ether 832 2 5 82 0 1 0 100 75-130 0 7 25 <br /> Ethylbenzene 334 2 5 364 1 8 87 75-135 06 15 <br /> Methyl tert-butyl ether 256 2 5 392 220 92 65-125 0 8 20 <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 analytrcal report must be reproduced in its entirety <br /> Page 8 of 10 <br />