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a <br /> Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento, CA 95834 <br /> (916) 921-9600 <br /> oo <br /> Analytical FAX(916) 921.o 100 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 6/17/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: 7G600-604-02 Received: 6/17/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 716/99 <br /> Volatile Organic Compounds by EPA Method 8260A/Quality 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 /> 9060306-BSD 1 <br /> Surrogate: 4-BFB 6121199 50.0 478 ug/1 700-130 95.6 <br /> B=h; -9960372 Rate Prepared: 6124199 Extraction Method: EPA 5030B jPITI <br /> Blank 906037.2-11ILKI <br /> Benzene 6/24199 ND ug/1 2.00 <br /> Bromobenzene ND 2.00 <br /> Bromochloromethane ND 2.00 <br /> Bromodichloromethane ND 2.00 <br /> Bromoform ND 2.00 <br /> Bromomethane ND 5.00 <br /> n-Butylbenzene ND 2.00 <br /> see-Butyl benzene ND 2.00 <br /> tert-Butylbenzene ND 2.00 <br /> VFntetrachloride ND 2.00 <br /> obenzene ND 2.00 <br /> Chloroethane ND 5.00 <br /> Chloroform ND 2.00 <br /> Chloromethane ND 5.00 <br /> 2-Chlorotoluene ND 2.00 <br /> 4-Chlorotoluene ND 2,00 <br /> Dibromochloromethane ND 2.00 <br /> 1,2-Dibromoethane ND 2.00 <br /> Dibromomethane ND 2.00 <br /> 1,2-Dibromo-3-chloropropane ND 5.00 <br /> 1,2-Dichlorobenzene ND 2.00 <br /> 1,3-Dichlorobenzene ND 2.00 <br /> 1,4-Dichlorobenzene ND 2.00 <br /> Dichlorodifluoromethane ND " 5,00 <br /> 1,1-Dichloroethane ND 2.00 <br /> 1,2-Dichloroethane ND 2.00 <br /> 1,1-Dichloroethene ND 2.00 <br /> cis-1,2-Dichloroethene ND 2.00 <br /> trans-1,2-Dichloroethene ND 2.00 <br /> 1,2-Dichloropropane " ND " 2,00 <br /> 1,3-Dichloropropane ND 2.00 <br /> 2,2-Dichloropropane ND 2.00 <br /> 1,1•Dichloropropene ND " 2.00 <br /> Ethylbenzene ND 2.00 <br /> Hexachlorobutadiene ND 2.00 <br /> Isopropylbenzene ND 2.00 <br /> p ropy[toluene " ND " 2.00 <br /> Sequoia Analytical-Sacramento *Refer to end ofreport for text ofnotes and definitions. <br /> Page 16 of 21 <br />