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4D— (4Jarvis Drive <br /> 85 <br /> 08)Sequoia Morgan8H 11 CA 95037 <br /> 776 9600 <br /> Analytical FAX(408)782-6308 <br /> www sequoialabs com <br /> URS Corporation[Arco II Project ARCO#6100,Tracey,CA MOF0786 <br /> 2870 Gateway Oaks Dr,Ste 300 Project[Number GOC IY-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 Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5GO7035-EPA 5030B P/T/EPA 8260B <br /> Laboratory Control Sample(5GO7035-BS2) Prepared&Analyzed 07/07/05 <br /> Benzene 5 49 050 ugll 608 90 65-115 <br /> Ethylbenzene 872 050 784 ill 75-135 <br /> Methyl tert-butyl ether 867 050 960 90 65-125 <br /> Toluene 333 050 329 101 85-120 <br /> Xylenes(total) 422 050 385 110 85-125 <br /> Gasoline Range Organics(C4 C12) 404 50 440 92 70 124 <br /> Surrogate 12-Dichloroerhane-d4 223 250 89 60-135 <br /> Laboratory Control Sample Dup(54C07035-111SDI) Prepared&Analyzed 07/07/05 <br /> tert Amyl methyl ether 945 050 ug/I too 94 80-115 2 15 <br /> Benzene 966 050 10 0 97 65-115 0 3 20 <br /> tert-Butyl alcohol 442 20 500 88 75-150 0 5 25 <br /> -0 <br /> isopropyl ether 943 050 to 0 94 75-125 1 l5 <br /> ,2-Dibromoethane(EDB) 10 3 050 10 0 103 85-120 2 15 <br /> 1 2-Diehl oroethane 968 050 100 97 85-130 0 5 20 <br /> Ethanol 275 100 200 138 70-135 07 35 HL <br /> Ethyl tert butyl ether 895 050 100 90 75-130 0 1 25 <br /> Ethylbenzene 11 1 050 100 ill 75-135 09 15 <br /> Methyl tert-butyl ether 688 050 100 69 65-125 25 20 RB <br /> Toluene 102 050 100 102 85-120 1 20 <br /> Xylenes(total) 33 5 050 300 112 85-125 1 20 <br /> Surrogate 1 2-Dichloroethane-d4 216 250 86 60-135 <br /> Matrix Spike(5GO7035-MSI) Source MOF0941-04 Prepared 07/07/05 Analyzed 07/08/05 <br /> Benzene 288 25 ug/I 304 ND 95 65-115 <br /> Ethylbenzene 447 25 392 ND 114 75-135 <br /> Methyl cert-butyl ether 1580 25 480 850 152 65 125 LM <br /> Toluene 1790 25 1640 ND 109 85-120 <br /> Xylenes(total) 2190 25 1920 ND 114 85-125 <br /> Gasoline Range Organics(C4 C12) 21900 2500 22000 740 96 70-124 <br /> Surrogate 12-Dichloroethane-d4 224 250 90 60-135 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyred in accordance with the chain of <br /> custody document Unless otherwise stared results are reported on a wet weight bases <br /> This analytical report must be reproduced in its entirety <br /> Page 12 off7 <br />