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$$5 Jervis <br /> rive <br /> Sequoia Morgan Hill CA 950375037 <br /> (408)776 9600 <br /> Analytical __--- FAX(408)792 o8 <br /> w <br />-•-- wwsequmalalabsbs com <br /> i <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MN10277 <br /> 3017 Kilgore Rd Suite 100 Project Number NIP Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 09/23/04 16 56 <br /> Purgeable Hydrocarbons and Volatile Organic Compounds by EPA method 8260B -Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC APD <br /> Analyte Result Limit Units Level Result %REC limits RPD Limn Notes <br /> Batch 4114008-EPA 5030B PIT <br /> Matrix Spike(4I14008-MSJ) Source MN10275-01 Prepared 09/14/04 Analyzed 09/15/04 <br /> Methyl tert butyl ether 922 050 ug/l 100 021 90 63-137 <br /> Benzene 8 79 050 100 ND 88 69-124 <br /> Toluene 9 12 050 100 ND 91 78-129 <br /> Ethylbenzene 900 050 100 ND 90 84 132 <br /> Xylenes(total) 276 050 300 ND 92 83-137 <br /> Surrogate 12 Dichloroethane-d4 595 500 119 78-129 <br /> Matrix Spike Dup(4114008-MSD I) Source MN10275-01 Prepared 09/14/04 Analyzed 09/15/04 <br /> Methyl tert-butyl ether 939 050 ugil 100 021 92 63-137 2 20 <br /> Benzene 8 85 050 100 ND 88 69-124 07 20 <br /> Toluene 9 17 050 100 ND 92 78-129 05 20 <br /> Ethylbenzenc 880 050 i; 100 ND 88 84-132 2 20 <br /> Xylenes(total) 273 050 300 ND 91 83-137 1 20 <br /> Surrogate 12 Dichloroerhane-d4 590 500 118 78-129 <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 analytical report must be reproduced in its entirety <br /> Page I 1 of 15 <br />