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J <br /> I8Hi Jarvis Dave <br /> 4 <br /> D Sequoia Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX 782-6308 <br /> www sequoe4uoiala6s corn <br /> URS Corporation(Arcot] Project ARCO 116020,Manteca,CA MOF0150 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC 1 V-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/20/05 13 36 <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 Linut Notes <br /> Batch 5F08009-EPA 5030B P/T/EPA 8260B <br /> Laboratory Control Sample(5F08009-BS2) Prepared&Analyzed 06/08/05 <br /> Benzene 568 050 ugA 608 93 65-115 <br /> Ethylbenzene 773 050 784 99 75-135 <br /> Methyl tent-butyl ether 866 050 960 90 65-125 <br /> Toluene 363 050 329 110 85-120 <br /> Xylenes(total) 443 050 385 115 85-125 <br /> Gasoline Range Organics(C4-C12) 387 50 440 88 70-124 <br /> Surrogate 1 2-Dichloroethane-d4 430 500 86 60435 <br /> Laboratory Control Sample Dup(5F08009-BSD1) Prepared&Analyzed 06/08/05 <br /> tert-Amyl methyl ether 106 050 ug/I 100 106 80-115 6 15 <br /> Benzene 107 050 Wo 107 65-115 16 20 <br /> tert-Butyl alcohol 51 1 20 500 102 75-150 2 25 <br /> W,t-isopropyl ether 108 050 ]GID 108 75-125 4 15 <br /> 2-Dibromoetbane(EDB) 807 050 100 81 85-120 13 15 HM <br /> 1,2-Dichloroethane 105 050 100 105 85-130 41 20 BA <br /> Ethanol 202 100 200 101 70-135 72 35 BA <br /> Ethyl tert-butyl ether Wo 050 100 100 75-130 6 25 <br /> Ethylbenzene 101 050 100 101 75-135 9 15 <br /> Methyl tert-butyl ether 946 050 100 95 65-125 25 20 13A <br /> Toluene 108 050 100 108 85-120 6 20 <br /> Xylenes(total) 337 050 300 112 85-125 16 20 <br /> Surrogate 12-Dichloroethane-d4 450 500 90 60-1.35 <br /> Matrix Spike(SF08009-MSI) Source MOF0123-05 Prepared 06/08/05 Analyzed 06/10/05 <br /> Benzene 478 050 ug/I 608 ND 79 65-115 <br /> Ethylbenzene 686 050 784 ND 88 75-135 <br /> Methyl tert-butyl ether 734 050 960 ND 76 65-125 <br /> Toluene 31 3 050 329 ND 95 85-120 <br /> Xylenes(total) 394 050 385 ND 102 85-125 <br /> Gasoline Range Organics(C4-C 12) 332 50 440 ND 75 70-124 <br /> Surrogate 12-Dichloroethane-d4 374 500 75 60-135 <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 staled results are reported on a wet weight basis <br /> Thus analytical report must be reproduced in its entirety <br /> Page 9 of I l <br />