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1 Blvd, <br /> 4D Sequoia 1455 McDowPetaalumaNCA949544 <br /> WoAnalytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P404367 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0307 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/05/04 17 30 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4040558-EPA 5030 soils �— — �!7 �` 4 <br /> Matrix Spike(4040558-MS1) Source P404453-18) Prepared&Analyzed 04f22/04 <br /> Tert-amyl methyl ether 0 462 0 GOA mg/kg 00500 ND 92 74-126 <br /> Benzene 0 0462------'0 0050 0 0500 ND 92 75-123 <br /> Tert-butyl alcohol 0 809 0 10 l 00 ND 81 66-129 <br /> Di-isopropyl ether 0 0485 00050 0 0500 ND 97 71-127 <br /> 1,2-Dibromoethane(EDB) 0 0486 00050 0 0500 ND 97 88-118 <br /> 1,2-Dichloroethane 0 0478 0 0050 0 0500 ND 96 79-119 <br /> Ethanol 1 36 0 20 1 00 ND 136 70-140 <br /> Ethylbenzene 0 0484 0 0050 0 0500 ND 97 65-135 <br /> Ethyl tert-butyl ether 0 0484 0 0050 00500 ND 97 72-123 <br /> Methyl tort-butyl ether 0 0464 0 0050 00500 ND 93 70-125 <br /> Toluene 0 0464 0 0050 00500 00015 90 76-123 <br /> rrogate Dibromofluoromethane 00516 00500 103 81-116 <br /> .rrogate 1 1-Dichloroethane-d4 0 04961 S 0 0500 99 73-131 <br /> Surrogate Toluene-d8 00532 �0- , 0500 106 81-119 <br /> Matrix Spike Dup(4040558-MS1D1) Source P404453-18 } Prepared&Analyzed 04/22/04 <br /> Tert-amyl methyl ether 00507 "--_0 0050 mg/kg 0 0500 ND 101 74-126 9 35 <br /> Benzene 00492 00050 0 0500 ND 98 75-123 6 35 <br /> Tert-butyl alcohol 0 852 0 l0 1 00 ND 85 66-129 5 35 <br /> Di-isopropyl ether 0 0519 0 0050 0 0500 ND 104 71-127 7 35 <br /> 1,2-Dibromoethane(EDB) 0 0531 00050 0 0500 ND 106 88-118 9 35 <br /> 1,2-Dichloroethane 0 0523 0 0050 0 0500 ND 105 79-119 9 35 <br /> Ethanol 177 020 1 00 ND 177 70-140 26 35 QM01 <br /> Ethylbenzene 0 0510 0 0050 0 0500 ND 102 65-135 5 35 <br /> Ethyl tert-butyl ether 0 0528 00050 0 0500 ND 106 72-123 9 35 <br /> Methyl tert-butyl ether 0 0510 00050 0 0500 ND 102 70-125 9 35 <br /> Toluene 0 0507 00050 0 0500 00015 98 76-123 9 35 <br /> Surrogate Dibromofluoromethane 00518 00500 104 81-126 <br /> Surrogate 1 2-Dichloroethane-d4 00503 00500 101 73-131 <br /> Surrogate Toluene-d8 00530 00500 106 81-119 <br /> Sequoia <br /> quota Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 9 of 12 <br />