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885 Jarvis Dr <br /> Sequoia MorganHill CA95037 <br /> PAX 8782-6308s Analytical wwwseguoialabs corn <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNG0370 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/20/04 09 33 <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 4G17001 -EPA 5030B P/T <br /> Matrix Spike Dup(4G17001-MSD1) Source MNG0241-09 Prepared 07/17/04 Analyzed 07/19/04 <br /> Benzene 240 25 ug/l 320 ND 75 69 124 3 20 <br /> Ethylbenzene 364 25 348 ND 105 84 132 4 20 <br /> Methyl tert-butyl ether 1060 25 496 590 95 63 137 6 20 <br /> Toluene 1470 25 1480 ND 99 78-129 1 20 <br /> Xylenes(total) 1810 25 1680 ND 108 83-137 5 20 <br /> Gasoline Range Organics(C4-Cl2) 20800 2500 22000 ND 95 70-124 4 20 <br /> Surrogate 1 2-Dichloroethane d4 482 500 96 78-129 <br /> Batch 4G19006-EPA 5030B P/T <br /> Blank(4G19006-BLKI) Prepared&Analyzed 07/I9/04 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 050 <br /> tert-Butyl alcohol ND 20 " <br /> DL-isopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl ter[butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4 C 12) ND 50 " <br /> Surrogate 1 2-Duhloroerhane-d4 4 92 5 00 98 78 129 <br /> Laboratory Control Sample(4GI9006-BSI) Prepared&Analyzed 07/19/04 <br /> tert-Amyl methyl ether 948 050 ug/1 100 95 82 140 <br /> Benzene 890 0 50 100 89 69 124 <br /> ter[-Butyl alcohol 515 20 500 103 56-131 <br /> Di-isopropyl ether 107 0 50 100 107 76 130 <br /> 1,2-Dibromoethane(EDS) I 1 3 0 50 100 113 77 132 <br /> 1,2-Dichloroethane 108 0 50 100 108 77 136 <br /> Ethanol 202 100 200 101 31 143 <br /> --Ethyl tert-butyl ether 9 93 0 50 " 10 0 9981=121 <br /> Ethylbenzene 103 0 50 100 103 84-132 <br /> Methyl tent-butyl ether 916 050 10 0 92 63-137 <br /> Sequoia Analytical-Morgan Hill The results in ibis 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 0 <br /> Page 7 of 11 <br />