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885 Jarvis Dr <br /> Sequoia Morgan Hill CA 95037 <br /> 4D1 (408)776-9600 <br /> Analytical FAX( 7826306 <br /> www sequoquotalabs coin <br /> Secor-Rancho Cordova(ARCO) Protect 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 %R.EC RPD <br /> Analyte Result Idm1t Units Level Result %REC ltmlla RPD limit Notes <br /> Batch 4GI7001-EPA 5030B P/T <br /> Laboratory Control Sample(4G17001-BS2) Prepared&Analyzed 07/17/04 <br /> Gasoline Range Organics(C4-C12) 349 5o ug/l 440 79 70 124 <br /> Surrogate 1 1-Drchloroethane-d4 518 500 104 78-119 <br /> Laboratory Control Sample Du (4G17001-BSDI) Prepared&Analyzed 07/17/04 <br /> tent-Amyl methyl ether 936 050 ug/l 100 94 82 140 1 20 <br /> Benzene 929 050 100 93 69 124 09 20 <br /> tert-Butyl alcohol 510 20 Soo 102 56-131 9 20 <br /> Di-isopropyl ether 11 0 050 100 110 76-130 4 20 <br /> 1,2-Dibromoethane(EDB) 109 050 100 109 77-132 0 20 <br /> 1,2-Dichloroethane 105 050 100 105 77-136 6 20 <br /> Ethanol 206 100 200 103 31-143 05 20 <br /> Ethyl tert-butyl ether 954 050 100 95 81-121 0 20 <br /> Ethylbenzene 102 050 100 102 84-132 6 20 <br /> Methyl tert butyl ether 896 050 100 90 63-137 4 20 <br /> Toluene 981 050 100 98 78-129 06 20 <br /> Xylenes(total) 327 050 300 109 83-137 4 20 <br /> Surrogate 1 1-Dichloroahane-d4 501 500 100 78-119 <br /> Laboratory Control Sample Dup(4G17001-BSD2) Prepared&Analyzed 07/17/04 <br /> Gasoline Range Organics(C4 C12) 429 50 ug/l 440 98 70-124 21 20 QC21 <br /> Surrogate 1 1-Drchloroethane-d4 489 500 98 78-119 <br /> Matrix Spike(4G]7001-MSI) Source MNG0241-09 Prepared 07/17/04 Analyzed 07/18/04 <br /> Benzene 248 25 ug/l 320 ND 78 69-124 <br /> Ethylbenzene 377 25 348 ND 108 84-132 <br /> Methyl cert-butyl ether 1000 25 496 590 83 63-137 <br /> Toluene 1490 25 " 1480 ND 101 78-129 <br /> Xylenes(total) 1910 25 1680 ND 114 83-137 <br /> Gasoline Range Organics(C4-C 12) 21700 2500 22000 ND 99 70-124 <br /> Surrogate 1 1-Drchloroethane-d4 492 5 00 98 78-119 <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 6 of 11 <br />