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a— ) (408)776-9600 <br /> l8g5l,CA Drive <br /> Sequoia Morgankill,CA45037 <br /> Analytical FAX(408)792.6309 <br /> . J www.sequoidabs.com <br /> Secor-Rancho Cordova(ARCO) Project:ARCO#4932,Stockton,CA MOG0595 <br /> 3017 Kilgore Rd.Suite 100 Project Number:GOCRD-0001 Reported: <br /> Rancho Cordova CA,95670 Project Manager:Clinton Harms 08/01/05 11:10 <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 5G25011-EPA 5030B PIT/EPA 8260B <br /> Matrix Spike Dup(5G25011-MSD1) Source:MOG0595-06 Prepared:07125/05 Analyzed:07/26/05 <br /> Benzene 308 25 ug/l 304 ND 101 65-115 3 20 <br /> Ethylbenzene 362 25 392 7.5 90 75-135 5 15 <br /> Methyl tert-butyl ether 3570 25 480 3300 56 65-125 3 20 LN <br /> Toluene 1900 25 1640 ND 116 85-120 5 20 <br /> Xylenes(total) 1790 25 1920 ND 93 85-125 4 20 <br /> Gasoline Range Organics(C4-Cl2) 25700 2500 22000 1800 109 70-124 3 20 <br /> Surrogate:1,2-Diehloroelhane-d4 2.54 2.50 102 60-135 <br /> Batch 51325012-EPA 5030B PIT/EPA 8260B <br /> Blank(SG25012-BLK1) Prepared&Analyzed:07/25/05 <br /> tert-Amyl methyl ether ND 0.50 ugll <br /> • Benzene ND 0.50 <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0.50 - <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 is <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Ethylbenzene ND 0,50 " <br /> Methyl ten-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Gasoline Range Organics(C4-Cl2) ND 50 " <br /> Surrogate,1,2-Dichloroethane.d4 5.75 5,00 115 60-135 <br /> Blank(SG25012-BLK2) Prepared&Analyzed:07/25/05 <br /> tert-Amyl methyl ether ND 0.50 ug/l <br /> Benzene ND 0.50 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0,50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Methyl tert-butyl ether ND 0.50 " <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,resulu are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 19 of 27 <br />