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vis <br /> �! 885 Dr <br /> Sequoia Morn(409 A 95037 <br /> )776 9GOp <br /> FAX 08 <br /> 1W Analytical wwscgt ialabs Gm <br /> www seyuoielabs comI* <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 8260H -Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD L4m1t Notes <br /> Batch 4G17001 -EPA 5030B PIT <br /> Blank(4GI7001-BLK1) Prepared&Analyzed 07/17/04 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Dr isopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dichlomcthane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethyl tert butyl ether ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 <br /> Gasoline Range Organics(C4 C 12) ND 50 " <br /> Surrogate 12-Dichloroethane-d4 458 500 92 78-129 <br /> Laboratory Control Sample(4G17001-BSI) Prepared&Analyzed 07/17/04 <br /> tert-Amyl methyl ether 9 27 0 50 ug/l 100 93 82 140 <br /> Benzene 921 0 50 too 92 69 124 <br /> tert-Butyl alcohol 464 20 Soo 93 56 131 <br /> Di-isopropyl ether 10 6 0 50 100 106 76 130 <br /> 1,2-Dibromoethane(EDB) 109 050 100 109 77-132 <br /> 1,2-Dichloroethane 986 0 50 100 99 77 136 <br /> Ethanal 205 100 200 102 31-143 <br /> Ethyl cert butyl ether 954 050 " 100 95 81-121 <br /> Ethylbenzene 10 8 050 too 108 84-132 <br /> Methyl tert-butyl ether 865 050 10 0 86 63-137 <br /> Toluene 975 050 10 0 98 78-129 <br /> Xylenes(total) 342 050 300 114 83-137 <br /> Surrogate 1 2-Dichloroethane-d4 468 500 94 78-129 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed to 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 5 of l l <br />