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85 <br /> Drive <br /> Ci)- <br /> 18H11,CA 5037 <br /> Sequoia Morgan Hil] CA 95037 <br /> Analytical (408)782 6300 <br /> FAX(408)782 6308 <br /> www sequoialahs com <br /> URS Corporation[Arco l] Project ARCO#6100,Tracey,CA MOF0786 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC 1 Y-0003 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 07/22/05 16 37 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunt Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5G12011 -EPA 5030B P/T/EPA 8260B <br /> Matrix Spike(5G12011-MSI) Source MOF1001-17 Prepared&Analyzed 07/12/05 <br /> Benzene 668 25 ugll 304 380 95 65-115 <br /> Ethylbenzene 4260 25 392 3700 143 75-135 BB LM <br /> Methyl tent-butyl ether 502 25 480 32 98 65-125 <br /> Toluene 1760 25 1640 40 105 85-120 <br /> Xylenes(total) 2160 25 1920 130 106 85-125 <br /> Gasoline Range Organics(124-C12) 38800 2500 22000 19000 90 70-124 <br /> Surrogate 12-Dichloroethane-d4 313 250 115 60-135 <br /> Matrix Spike Dup(5G12011-MSD1) Source MOF1001-17 Prepared&Analyzed 07/12/05 <br /> Benzene 666 25 ug/l 304 380 94 65-115 0 3 20 <br /> Ethylbenzene 4180 25 392 3700 122 75-135 2 15 <br /> Methyl tert butyl ether 506 25 480 32 99 65-125 0 8 20 <br /> luene 1730 25 1640 40 103 85 120 2 20 <br /> ylenes(total) 2100 25 1920 130 103 85-125 3 20 <br /> Gasoline Range Organics(C4-C12) 38800 2500 22000 19000 90 70-124 0 20 <br /> Surrogate 1 2-Dechloroelhane-d4 3 13 2 50 125 60-135 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analy_ed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight bases <br /> This analytical report must be reproduced in its entirety <br /> Page 16 of 17 <br />