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885 Janis Dr <br /> Seuo�a Morgan 0] CA 95037 <br /> 9 (4408)776 9000 <br /> FAX 6308Analytical www sequinalabs <br /> coin <br /> Secor-Rancho Cordova(ARCO) Project ARCO#0595,Stockton,CA MNG0109 <br /> 3017 Kilgore Rd Suite 100 Project Number 62546 Reported <br /> Rancho Cordova CA, 95670 Project Manager Rusty Benkosky 07/20/04 20 24 <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 4G14020-EPA 5030B P/T <br /> Laboratory Control Sample(4Gi4020-BS2) Prepared&Analyzed 07/14/04 <br /> Benzene 519 050 ug/l 640 81 69-124 <br /> Ethylbenwrie 808 050 696 116 84-132 <br /> Methyl tert butyl ether 903 050 992 91 63-137 <br /> Toluene 322 050 297 108 78-129 <br /> Xyienes(total) 404 050 337 120 83-137 <br /> Gasoline Range Organics(C4-C12) 453 50 440 103 70-124 <br /> Surrogate 11-Diehloroethane-d4 115 150 86 78-129 <br /> Laboratory Control Sample Du (4G14020-BSD1) Prepared&Analyzed 07/14/04 <br /> telt-Amyl methyl ether 802 050 ug/l 100 80 82-140 24 20 QCO2,QC20 <br /> Benzene 925 050 100 92 69-124 2 20 <br /> Wrt-Butyl alcohol 121 so Soo 242 56-131 75 20 QCO 1,QC20 <br /> i-isopropyl ether 973 050 100 97 76-130 3 20 <br /> 1,2-Dibromoethane(EDB) 102 050 100 102 77-132 3 20 <br /> 1,2-Dichlomethane 101 050 100 101 77-136 1 20 <br /> Ethanol 410 100 200 205 31-143 72 20 QC04 QC20 <br /> Ethyl tert-butyl ether 856 050 100 86 81-121 14 20 <br /> Ethylbenaene 994 050 100 99 84-132 8 20 <br /> Methyl tert-butyl ether 866 050 100 87 63-137 20 20 <br /> Toluene 938 050 100 94 78-129 10 20 <br /> Xylenes(total) 304 050 " 300 101 83-137 8 20 <br /> Surrogate 11-Dichloroethane-d4 219 2.50 88 78-119 <br /> Matrix Spike(4G14020-MS1) Source MNG0175-06 Prepared&Analyzed 07/14/04 <br /> Benzene 5880 50 u9/l 640 5400 75 69-124 <br /> Ethylbenzene 3400 50 696 2700 101 84-132 <br /> Methyl tert-butyl ether 792 50 992 320 48 63-137 QM02 <br /> Toluene 9970 50 " 2970 7200 93 78-129 <br /> Xylenes(total) 12800 50 3370 9500 98 83-137 <br /> Gasoline Range Organics(C4-C12) 106000 5000 44000 71000 80 70-124 <br /> Surrogate l 2-Drchloroethane-d4 214 250 86 78-119 <br /> �Sequoia Analy#teak-Morgan Hill The results in[his report apply 10 the samples analyzed un accordanc�- h c auifody documem Unlessrhernrse stresults are reported on aht basis <br /> This analytical report inust be reproduced in its entirety <br /> Page 14 of 21 <br />