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885 JarvisDrive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> FAX(408)782-6308 <br /> Analytical <br /> www sequoialabs corn <br /> URS Corporation LArcoll Project ARCO#5469,Stockton,CA M000479 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 04/07/05 12 53 <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 5C30005-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample Dup(5C30005-BSD1) Prepared&Analyzed 03/30/05 <br /> Surrogate I 1-Dichloroethane-d4 481 ugll 500 96 60-135 <br /> Matrix Spike(5030005-MS1) Source NI000574-13 Prepared&Analyzed 03/30/05 <br /> Benzene 392 25 ug/l 320 110 88 65-115 <br /> Ethylbenzene 1150 25 376 750 106 75-135 <br /> Methyl tert-butyl ether 583 25 496 74 103 65-125 <br /> Toluene 2720 25 1600 1000 108 85-120 <br /> Xylenes(total) 5490 25 1830 3500 109 85-125 <br /> Gasoline Range Organics(C4-C12) 42200 2500 22000 20000 101 70-124 <br /> Surrogate 1 1-Drchloroethane-d4 560 500 112 60-135 <br /> ix Spike Dup(5030005-MSD1) Sourct, 111000574-13 Prepared&Analyzed 03/30/05 <br /> ne 379 25 ug/l 320 110 84 65-115 3 20 <br /> Ethylbenzene 1130 25 376 750 101 75-135 2 15 <br /> Methyl tert-butyl ether 570 25 496 74 100 65-125 2 20 <br /> Toluene 2630 25 1600 1000 102 85-120 3 20 <br /> Xylenes(total) 5270 25 1830 3500 97 85-125 4 20 <br /> Gasoline Range Organics(C4-C12) 40400 2500 22000 20000 93 70-124 4 20 <br /> Surrogate 1 1-Drchloroethane-d4 537 500 107 60-135 <br /> uoia 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 /> Page 25 of 30 <br />