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885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> `1 (408)776-9600 <br /> Analytical FAX 782-6308 <br /> wwwscquoiequoialabs.com <br /> Secor-Rancho Cordova(ARCO) Project:ARCO#2133,Stockton,CA M00O299 <br /> 3017 Kilgore Rd.Suite 100 Project Number:NIP Reported: <br /> Rancho Cordova CA,95670 Project Manager:Rusty Benkosky 03/23/05 13:43 <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 5C21005- EPA 5030E PIT/EPA 8260B <br /> Matrix Spike(5021005-MS1) Source:M000336-02 Prepared&Analyzed: 03/21/05 <br /> Benzene 1110 25 ugll 320 850 81 65-115 <br /> Ethylbenzene 1670 25 376 1300 98 75-135 <br /> Methyl tert-butyl ether 6300 25 496 5700 121 65-125 E <br /> Toluene 1650 25 1600 38 101 85-120 <br /> Xylenes(total) 4320 25 1830 2500 99 85-125 <br /> Gasoline Range Organics(C4-C12) 49800 2500 22000 26000 108 70-124 <br /> Surrogate:1,2-Dichloroethane-d4 4.65 5.00 93 60-135 <br /> Matrix Spike Dup(5C21005-MSD1) Source: M000336-02 Prepared&Analyzed:03/21/05 <br /> Benzene 1110 25 ug/I 320 850 81 65-115 0 20 <br /> Ethylbenzene 1670 25 376 1300 98 75-135 0 15 <br /> .Methyl tert-butyl ether 6480 25 496 5700 157 65-125 3 20 E,BB,LM <br /> Toluene 1650 25 1600 38 101 85-120 0 20 <br /> Xylenes(total) 4240 25 1830 2500 95 85-125 2 20 <br /> Gasoline Range Organ ics(C4-C 12) 49500 2500 22000 26000 107 70-124 0.6 20 <br /> Surrogate:l,2-Dichloroethane-d4 4.72 5.00 94 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 /> 0 This analytical report must be reproduced in its entirety. <br /> Page 16 of 17 <br />