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rY_ 885 Jarvis <br /> rive <br /> Sequoia Morgan Hill CA 95037 <br /> (408)776 9600 <br /> FAXiW Analytical www <br /> equo la2eom <br /> www seguaialalrs corn 0 <br /> Secor-Rancho Cordova(ARCO) Project ARCO 94932,Stockton,CA MNH0056 <br /> 3017 Kilgore Rd Suite 100 Project Number NIP Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/26/04 I8 55 <br /> Purgeable Hydrocarbons and Volatile Organic Compounds by EPA method 8260B -Quality Control <br /> Sequoia Analytical-Morgan H111 <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4H13002-EPA 5030B PIT <br /> Matrix Spike Dup(4H13002-MSD1) Source MNH0056-04 Prepared 08/13/04 Analyzed 08/14/04 <br /> Methyl tert-butyl ether 2760 25 ug/I 496 1700 214 63-137 04 20 LM <br /> Gasoline Range Organics(C4-C 12) 23800 2500 22000 4900 86 70-124 3 20 <br /> Benzene 499 25 320 160 106 69-124 2 20 <br /> Toluene 2430 25 1480 590 124 78-129 2 20 <br /> Ethylbenzene 582 25 348 140 127 84-132 3 20 <br /> Xylenes(total) 2640 25 1680 670 117 83-137 3 20 <br /> Surrogate 1 2-Drchloroethane-d4 4 83 500 97 78-129 <br /> Batch 4H16003-EPA 5030B PIT <br /> Blank(4HI6003-BLKI) Prepared&Analyzed 08/16/04 <br /> Methyl tert-butyl ether ND 050 ug/l <br /> Gasoline Range Organics(C4 C12) ND 50 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 1 2-Drchloroethane-d4 4 65 5 04 93 78-129 <br /> Laboratory Control Sample(4H16003-BS1) Prepared&Analyzed 08/16/04 <br /> Methyl tart-butyl ether 103 0 50 ug/1 100 103 63-137 <br /> Benzene 104 050 100 104 69-124 <br /> Toluene 110 050 100 110 78-129 <br /> Ethylbenzene 112 0 50 100 112 84-132 <br /> Xylenes(total) 31 6 0 50 " 300 105 83-137 <br /> Surrogate 12-Drchloroethane-d4 4 79 500 96 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 stared,results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 11 of 15 <br />