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85 <br /> Drive <br /> Sequoia 8Hill C is 5037 <br /> Morgan Hill CA 95037 <br /> (408)776-9600 <br /> 1W Analytical FAX equo labs c m <br /> t www sequotaigbs cam <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNH0071 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/06/04 15 45 <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 4HO5027-EPA 5030E PIT <br /> Labora!og Control Sample(4H05027-BS2) Prepared&Analyzed 08/05/04 <br /> Benzene 541 050 ugll 640 85 78 124 <br /> Ethylbenzene 775 050 696 111 84-117 <br /> Methyl ten butyl ether 904 050 9 92 91 63-137 <br /> Toluene 311 0 50 297 105 78-129 <br /> Xylenes(total) 395 050 337 114 83-125 <br /> Gasoline Range Organics(C4-C 12) 382 50 440 87 70-124 <br /> Surrogate I2-Drchloroethane-d4 219 150 88 78-129 <br /> Laboratory Control Sample Dup(4H05027-ESDI) Prepared 08/05/04 Analyzed 08/06/04 <br /> tert-Amyl methyl ether 101 050 ug/l 100 101 56 140 0 12 <br /> Benzene 101 050 10 0 101 78-124 3 12 <br /> tert Butyl alcohol 53 8 20 ;i 500 108 0-206 14 22 <br /> Di-isopropyl ether 101 0 50 100 101 76-130 0 9 <br /> 1,2-Dibromoethane(EDB) 996 050 100 100 77-132 0 6 9 <br /> 12 Dichloroethane 10 4 050 100 104 77 136 1 13 <br /> Ethanol 105 100 200 52 31-186 45 37 IC,RB <br /> Ethyl tert-butyl ether 104 0 50 100 104 61-141 2 9 <br /> Ethylbenzene 104 0 50 100 104 84 117 3 10 <br /> Methyl tert butyl ether 10 9 050 100 109 63-137 9 13 <br /> Toluene 998 050 100 100 78-129 3 10 <br /> Xylenes(total) 313 050 300 104 83-125 2 11 <br /> Surrogate 12-Drchloroethane-d4 218 250 87 78-119 <br /> Matrix Spike(4H05027-MS1) Source MNH0071-02 Prepared 08/05/04 Analyzed 08/06/04 <br /> Benzene 564 50 ug/1 640 ND 88 78-124 <br /> Ethylbenzene 824 50 696 ND 118 84-117 LM <br /> Methyl tent butyl ether 3580 50 992 2700 89 63 137 <br /> Toluene 3200 50 2970 ND 108 78-129 <br /> Xylenes(total) 4020 50 3370 ND U9 83-125 <br /> Gasoline Range Organics(C4 C12) 40300 5000 44000 ND 92 70-124 <br /> Surrogate 12-Drchloroethane-d4 116 2 50 90 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 5 of 8 <br />