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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento,)9 99600 <br /> Analytical (916)921-9600 <br /> FAX(916)921-0100 <br /> www seguoialabs cam <br /> SECOR International-Rancho Cordova Project ARCO 4493,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number 4493,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 05/24/02 16 48 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2050142-EPA 5030B[PIT] <br /> Blank(2050142-BLK1) _ Prepared&Analyzed 05/14/02 <br /> Tert-butyl alcohol ND 0 050 mg/kg <br /> Methyl tert-butyl ether ND 0 0050 <br /> Di-isopropyl ether ND 0 0050 " <br /> Ethyl tent-butyl ether ND 0 0050 " <br /> Tert-amyl methyl ether ND 0 0050 " <br /> Ethanol ND 020 " <br /> 1,2-Dichloroethane ND 0 0050 " <br /> 1 2-Dibromoethane(EDB) ND 0 0050 " <br /> Surrogate 12-DCA-d4 00452 00500 90 60-140 <br /> LCS(2050142-BS1) - Prepared&Analyzed 05/14/02 <br /> Methyl tert-butyl ether 0 0425 00050 mg/kg 0 0500 85 60-140 <br /> Wrrogate 1 1-DCA-d4 00427 " 00500 85 60-140 <br /> atrix Spike(2050142-MS1) Source 5205099-46 Prepared&Analyzed 05/14/02 <br /> Methyl tert-butyl ether 00417 0 0050 mg/kg 00500 ND 83 60-140 <br /> Surrogate 1 2-DCA-d4 00427 1100500 85 60-140 <br /> Matrix Spike Dup(2050142-MSDI) Source S205099-46 Prepared&Analyzed 05/14/02 <br /> Methyl tert-butyl ether 00435 0 0050 mg/kg 0 0500 ND 87 60-140 4 25 <br /> Surrogate 12-DCA-d4 00444 00500 89 60-140 <br /> Batch 2050153-EPA 5030B JP/TI <br /> Blank 2050153-BLK1Prepared&Analyzed 05/15/02 <br /> Tert-butyl alcohol ND 0 050 mg/kg <br /> Methyl tert-butyl ether ND 0 0050 " <br /> Di-isopropyl ether ND 0 0050 " <br /> Ethyl tert-butyl ether ND 0 0050 " <br /> Tert-amyl methyl ether ND 0 0050 " <br /> 1,2-Dichloroethane ND 0 0050 " <br /> 1 2-Dibromoethane(EDB) ND 0 0050 " <br /> Surrogate 12-DCA-d4 00490 00500 98 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 7 of 9 <br />