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` Sequoia 819 Striker Avenue, Suite 8 <br /> Sacramento, CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0 100 <br /> FSECOR 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 Mana er: Rusty Benkosky Reported: 7/6/99 <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 /> Batch: 9060306 122te Prepared: 6/21/99 Extraction Method: EPA 5030E [P/TI <br /> B lan 9060306-8L.K 1 <br /> Benzene 6/21/99 ND ug/l 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 /> sec-Butyl benzene ND " 2,00 <br /> tert-Butylbenzene ND 2.00 <br /> Carbon tetrachloride ND 2.00 <br /> Chlorobenzene ND 2.00 <br /> Chloroethane ND 5.00 <br /> form " ND '' 2.00 <br /> methane ND 5.00 <br /> 2-Chlorotoluene ND 2,00 <br /> 4-Chlorotoluene ND 2.00 <br /> Dibromochloromethane ND 2.00 <br /> i,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 /> I,1-Dichloroethane ND 2.00 <br /> I,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 /> Isopropyl benzene ND 2.00 <br /> p-Isopropyltoluene ND 2.00 <br /> Methylene chloride ND 5.00 <br /> Naphthalene ND 5.00 <br /> n- ylbenzene ND 2.00 <br /> Sequoia Analytical -Sacramento *Refer to end of report for text of notes and definitions. <br /> Page l4 of 21 <br />