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Dnve <br /> W Jarvis <br /> Sequoia Morgan Hill CA 950375037 <br />' (408)776 9300 <br /> Analytical FAX 782 6308 <br /> www sequoiquoialabs com <br /> URS Corporation(Arcoll Project ARCO#0760,Lodi,CA MNK0808 <br />' 2870 Gateway Oaks Dr,Ste 300 Project Number G09JZ-0461 Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 12/10/04 17 00 <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 4LO9004-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample(4L09004-BS2) Prepared&Analyzed 12/09/04 <br /> Benzene 551 20 ug/1 640 86 69-124 <br /> Ethylbenzene 8 16 20 752 109 84-132 <br /> Methyl tert-butyl ether 8 73 50 992 88 63-137 <br /> Toluene 336 20 319 105 78-129 <br /> Xylenes(total) 420 40 366 Hs 83-137 <br /> Gasoline Range Organics(C4-C12) 413 50 440 94 70-124 <br /> Surrogate 12-Drchloroethane-d4 445 500 89 78-129 <br />' Laboratory Control Sample Dup(4L09004-BSD2) Prepared&Analyzed 12/09/04 <br /> Benzene 5 41 0 50 ugll 640 85 69-124 2 20 <br /> Ethylbenzene 807 0 50 752 107 84-132 1 20 <br /> JMethyl tert-butyl ether 843 0 50 992 85 63-137 3 20 <br /> Olaene 33 3 050 " 31 9 104 78-129 0 9 20 <br /> ylenes(total) 422 0 50 366 115 83-137 05 20 <br /> Gasoline Range Organics(C4-C12) 378 50 440 86 70-124 9 20 <br /> Surrogate 1 2-Drchloroethane-d4 448 5 00 90 78-129 <br /> Matrix Spike(41,09004-MSI) Source MNLO149-02 Prepared 12/09/04 Analyzed 12/10/04 <br /> tert-Amyl methyl ether 191 10 ugll 200 ND 96 82-140 <br /> Benzene 196 10 " 200 ND 98 69-124 <br /> tert-Butyl alcohol 1110 400 1000 ND 111 56-131 <br /> Di-isopropyl ether 198 10 200 ND 99 76-130 <br /> 1,2-Dibromoethane(EDB) 181 10 " 200 ND 90 77-132 <br /> 12-Drchloroethane 198 10 200 ND 99 77-136 <br /> Ethanol 3910 2000 4000 ND 98 31-143 <br /> Ethyl tert-butyl ether 200 10 200 ND 100 81-121 <br /> Ethylbenzene 204 10 n 200 ND 102 84-132 <br /> Methyl tert-butyl ether 1010 10 200 890 60 63-137 BB,LN <br /> Toluene 194 10 200 ND 97 78-129 <br /> Xylenes(total) 631 10 600 ND 105 83-137 <br /> Surrogate 12-Dichloroethane d4 435 500 87 78-129 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> M custody document Unless otherwise stated results are reported on a wet weight basis <br /> Ats analytical report must be reproduced in its entirety <br /> Page 11 of 13 <br />