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819 Striker Avenue.Suite 8 <br /> Sequoia Sacramento, 9Z -W" <br /> 5834 <br /> (916)921 <br /> FAX(916)921-0100 <br /> Analytical vuoiaia�.�m <br /> SECOR International-Rancho Cordova Project: ARCO 4493,Stockton,CA Sampled: 5/8/00 <br /> 3017 Kilgore Road,Suite 100 Project Number: N/A Received: 5110100 <br /> Rancho Cordova,CA 95670 Project Manager: Rusty Benkosky Reported: 5118/00 <br /> Volatile=Oxygenate.Compounds=by-EPA=Method_8260ALQu_ality_Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Blank(continued) 0050163-BLK2 <br /> Ethanol 5116/00 ND ugll 3000 <br /> 1,2-Dichloroethane ND 2'00 <br /> Ethylene dibromide ND 2.00 <br /> Surrogate: 1,2-DCA-d4 50.0 58.6 60.0-140 117 <br /> M�S 0050163-BSI <br /> Methyl tert-butyl ether 5/15/00 50,0 49.0 ug/l 70.0-130 98.0 <br /> Surrogate: 1,2-DCA-d4 50.0 56.2 60.0-140 112 <br /> LCS Dun 0050163-BSDI <br /> Methyl tert-butyl ether 5/15/00 50.0 52.2 Ug/1 <br /> 70.0-130 104 25.0 5.94 <br /> Surrogate: 1,2-DCA-d4 50.0 54.2 60.0-140 108 <br /> Matrix Spike 0050163-MS1 5005173-01 <br /> Methyl tert-butyl ether 5/15/00 50.0 374 443 ug/l 60.0-140 138 <br /> Surrogate: 1,2-DCA-d4 „ 50.0 58.0 60.0-140 116 <br /> Matrix S ike Dup 0050163-MSDI S005t73-01 <br />�Metlt4'tert=butyl'ether - 5/1-5/0050:0-r-=,=----374�442.mug11 <br /> Surrogate: 1,2-DCA-d4 50.0 56.8 60.0-140 114 <br /> Sequoia Analytical-Sacramento *Refer to end of report for test of notes and definitions. <br /> Page 21 of 22 <br />