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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical 707)792-1865 <br /> FAX((70T)792-0342 <br /> 46 www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P404354 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0307 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/28/04 16 54 <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 /' � f R q 14 <br /> Matrix Spike(40405_58-_MS1) Source P404453-18� Prepared&Analyzed 04/22/04 <br /> Tert-amyl methyl ether 0 0462�0 0050 tng/kg 00500 ND 92 74-126 <br /> Benzene 00462 00050 00500 ND 92 75-123 <br /> Teri-butyl alcohol 0 809 0 10 100 ND 81 66-129 <br /> 1h-isopropyl ether 00485 00050 00500 ND 97 71-127 <br /> 1,2-Dibromoethane(EDB) 00486 00050 00500 ND 97 88-118 <br /> 1,2-Dichloroethane 00478 0 0050 00500 ND 96 79-119 <br /> Ethanol 136 020 100 ND 136 70-140 <br /> Ethylbenzene 00484 0 0050 00500 ND 97 65-135 <br /> Ethyl tert-butyl ether 00484 00050 00500 ND 97 72-123 <br /> Methyl tert-butyl ether 00464 0 0050 00500 ND 93 70-125 <br /> Toluene 00464 00050 00500 00015 90 76-123 <br /> rragate Dibromofluoromethane 00516 " 00500 103 81-126 <br /> rrogate 1 2-Dichloroethane-d4 00496 {� ,� 1 00500 99 73-131 <br /> Surrogate Toluene-d8 00532 �..► �� ,��0 _0500 106 82-129 <br /> Matrix Spike Dup(404_0.558-MSD1) Sources P404453 18 �✓�'r�r"e'pared do Analyzed 04/22/04 _ <br /> Tert-amyl methyl ether 0 056-0 0050 mg/kg 00500 ND 101 74-126 9 35 <br /> Benzene 00492 00050 00500 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 00519 0 0050 00500 ND 104 71-127 7 35 <br /> 1,2-Dibrotnoethane(EDB) 00531 00050 00500 ND 106 88-118 9 35 <br /> 1,2-Dichloroethane 00523 00050 00500 ND 105 79-119 9 35 <br /> Ethanol 177 020 l 00 ND 177 70-140 26 35 QM01 <br /> Ethylbenzene 00510 00050 00500 ND 102 65-135 5 35 <br /> Ethyl tert-butyl ether 00528 00050 00500 ND 106 72-123 9 35 <br /> Methyl to t-butyl ether 00510 00050 00500 ND 102 70-125 9 35 <br /> Toluene 00507 00050 00500 00015 98 76-123 9 35 <br /> Surrogate Dibromofluoromethane 00518 00500 104 81-126 <br /> Surrogate 12-Dichloroethane-d4 00503 00500 101 73-131 <br /> Surrogate Toluene-d8 00530 00500 106 82-129 <br /> 0 <br /> Sequoia <br /> quota Analytical-Petaluma 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 10 of 13 <br />