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1885 Jarvis Anve <br /> lz_ Sequoia Morgm Hill CA 95037 <br /> 9600 <br /> Analytical (408 776- <br /> FAX(408))782-663083M <br /> � www sequoialabs com <br /> URS Corporation[Arco]] Project ARCO#2186,Stockton,CA MOF0559 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G09JZ-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/27/05 16 38 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lint Units Level Result %REC Lunits RPD Luiut Notes <br /> Batch 5F23012-EPA 5030B P/T/EPA 8260B <br /> Laboratory Control Sample(5F23012-BS2) Prepared&Analyzed 06/23/05 <br /> Benzene 581 050 ugA 608 96 65-115 <br /> Ethylbenzene 728 050 " 784 93 75-135 <br /> Methyl tert-butyl ether 927 050 960 97 65-125 <br /> Toluene 359 050 329 109 85-120 <br /> Xylenes(total) 34 1 050 385 89 85-125 <br /> Gasoline Range Organics(C4-C12) 465 50 440 106 70-124 <br /> Surrogate 1 2-Dichloroethane-0 137 250 95 60-135 <br /> Laboratory Control Sample Dup(5F23012-BSDI) Prepared&Analyzed 06/23/05 <br /> tert-Amyl methyl ether 109 050 ug/1 100 109 80-115 2 15 <br /> Benzene 109 050 100 109 65-115 4 20 <br /> Wtert-Butyl alcohol 505 20 Soo 101 75-150 11 25 <br /> i-isopropyl ether 11 1 050 100 111 75-125 4 15 <br /> 1,2-Dibromoethane(EDB) 109 050 100 109 85-120 3 15 <br /> 1,2-Dichloroethane 107 050 100 107 85-130 4 20 <br /> Ethanol 210 100 200 105 70-135 11 35 <br /> Ethyl Cert-butyl ether 107 050 Wo 107 75-130 3 25 <br /> Ethylbenzene 927 050 10 0 93 75-135 09 15 <br /> Methyl Leri-butyl ether 108 050 100 108 65-125 6 20 <br /> Toluene 113 050 100 113 85-120 5 20 <br /> Xylenes(total) 279 050 300 93 85-125 1 20 <br /> Surrogate 12-Dichloroethane-d4 229 150 92 60-135 <br /> Matrix Spike(5F23012-MS1) Source MOF0559-01 Prepared 06/23/05 Analyzed 06/24/05 <br /> Benzene 923 50 ug/I 608 370 91 65-115 <br /> Ethylbenzene 1080 50 784 390 88 75-135 <br /> Methyl tert-butyl ether 4040 50 960 3000 108 65-125 <br /> Toluene 3580 50 3290 30 108 85-120 <br /> Xylenes(total) 4630 50 3850 1300 86 85-125 <br /> Gasoline Range Organics(C4-C12) 50800 5000 44000 7500 98 70-124 <br /> Surrogate 12-Dichloroethane-d4 231 250 92 60-135 <br /> I <br /> I <br /> i <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 /> I <br /> Page 10 of 12 <br />