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r <br /> l Blvd North Ste D <br /> Sequoia 1455 McDowPetaluma CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoinlabs com <br /> URS Corp- Sacramento Project Arco Site 6100,Tracy,CA P404510 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/05/04 18 51 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Ana[yte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4040751 - EPA 5030 soils <br /> Matrix Spike(4040751-MSI) Source P404510-03 Prepared&Analyzed 04/29/04 <br /> Tert-amyl methyl ether 00518 00050 mg/kg 00500 ND 104 74-126 <br /> Benzene 00530 00050 00500 0 028 50 75-123 QM02 <br /> Tert-butyl alcohol 0 880 0 10 1 00 00096 87 66-129 <br /> Di-isopropyl ether 00542 00050 00500 ND 108 71-127 <br /> 1 2-Dibromoethane(EDB) 00560 00050 00500 ND 112 88-118 <br /> 1 2-Dichloroethane 00533 00050 00500 ND 107 79-119 <br /> Ethanol 0 789 020 1 00 0 14 65 70-140 <br /> QM02 <br /> Ethylbenzene 00510 00050 00500 00023 97 65-135 <br /> Ethyl tert-butyl ether 00545 00050 00500 ND 109 72-123 <br /> Methyl Cert-butyl ether 00537 00050 00500 ND 107 70-125 <br /> Toluene 00501 00050 00500 00027 95 76-123 <br /> Dibromofluoromethane 00538 I, 00500 108 81-116 <br /> gate 1 2-Dichloroethane-d4 0(1546 00500 109 73-131 <br /> #rogate <br /> gate Toluene-d8 00497 00500 99 82-129 <br /> Matrix Spike Dup(4040751-MSD1) Source P404510-03 Prepared&Analyzed 04/29/04 <br /> Tert-amyl methyl ether 00522 00050 mg/kg 00500 ND 104 74-126 0 8 35 <br /> Benzene 00539 00050 00500 0 028 52 75-123 2 35 QM02 <br /> Tert-butyl alcohol 0 976 0 10 1 00 00096 97 66-129 10 35 <br /> Di-isopropyl ether 00515 00050 00500 ND 103 71-127 5 35 <br /> 1 2-Dibromoethane(EDB) 00538 00050 00500 ND 108 88-118 4 35 <br /> 1 2-Dichloroethane 00557 00050 00500 ND 111 79-119 4 35 <br /> Ethanol 1 17 020 1 00 0 14 103 70-140 39 35 QC20 <br /> Ethylbenzene 00501 00050 00500 00023 96 65-135 2 35 <br /> Ethyl tert-butyl ether 00518 00050 00500 ND 104 72-123 5 35 <br /> Methyl tert-bury]ether 00510 00050 00500 ND 102 70-125 5 35 <br /> Toluene 00516 00050 00500 00027 98 76-123 3 35 <br /> Surrogate Dibromofluoromethane 00536 00500 107 81-126 <br /> Surrogate 12-Dichloroethane-d4 00544 00500 109 73-131 <br /> Surrogate Toluene-d8 00522 00500 104 82-129 <br /> oia Analytical- Petaluma The results in this report apply to the samples analyzed to 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 16 of 17 <br />