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a— ) (408)• 1865 Jarvis 37Sequola Matgan Hill,CA 9505037Analytical FAX 7 -9600 <br /> 78782-630806 <br /> www.sequoiquoiala6s.com <br /> Sever-Rancho Cordova(ARCO) Project:ARC01l4932,Stockton,CA MOG0595 <br /> 3017 Kilgore Rd.Suite 100 Project Number:G0C8D-0001 Reported: <br /> Rancho Cordova CA,95670 Project ManagecClinton Harms 08/01/05 11:10 <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 5G27004-EPA 5030B PIT I EPA 8260B <br /> I' <br /> laboratory Control Sample Dup(5G27004-BSD1) Prepared&Analyzed:07/27/05 <br /> Surrogate:1,2-Dichloroethaned4 1.86 ug/7 2.50 114 60-135 <br /> Matrix Spike(5G27004-MSI) Source-.MOG0641-12 _ _Prepared&Analyzed:07/27/05 <br /> Benzene 6440 50 ugfl 608 6000 72 65-115 <br /> Elhylbenzene 2300 50 784 1500 102 75-135 <br /> Methyl cert-butyl ether 981 50 960 15 101 65-125 <br /> Toluene 3680 50 3290 51 110 85-120 <br /> Xylenes(total) 4410 50 3850 100 112 85-125 <br /> Gasoline Range Organics(C4-C12) 62100 5000 44000 16000 105 70-124 <br /> Surrogate:1,2-Dichloroethane-d4 3.10 2.50 114 60-135 <br /> Matrix Spike Dup(5G27004-MSDI) Source:MOG0641-12 Prepared&Analyzed:0WB <br /> 7/27/05 <br /> enzene 6470 50 ugft 608 6000 77 65-115 0.5 20 <br /> thylbenzene 2360 50 784 1500 110 75-135 3 15 <br /> Methyl tent-butyl ether 984 50 960 15 - 101 65-125 0.3 20 <br /> Toluene 3740 50 3290 51 112 85-120 2 20 <br /> Xylenes(total) 4380 50 3850 100 111 85-125 0.7 20 <br /> Gasoline Range Organics(C4-C 12) 63300 5000 44000 16000 108 70-124 2 20 <br /> Surrogate:1,1-Dichloroethaned4 3.11 2.50 124 60-135 <br /> Sequoia 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 artalyacal report must be reproduced in its entirety. <br /> Page 26 of 27 <br />