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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 /> EMCON-Cameron Park Project: ARCO 2186,Stockton,CA Sampled: 6/21/99 <br /> 3939 Cambridge Rd.Suite 200 Project Number: 21775-237-002 Received: 6/21/99 <br /> Cameron Park,CA 95682 Project Manager: Mark Capps Reported: 6/29/99 <br /> Volatile Organic Compounds by,EPA Method 8010B/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: 9060385 Date Prepared: 6/28/99 Extraction Method: EPA 5030B IWOHI <br /> Blank 9060385-BLKI <br /> Bromodichloromethane 6/28/99 ND ug/kg 5.00 <br /> Bromoform ND 5.00 <br /> Bromomethane ND 10.0 <br /> Carbon tetrachloride ND 5.00 <br /> Chlorobenzene ND 5.00 <br /> Chloroethane ND 10.0 <br /> 2-Chloroethylvinyl ether ND 10.0 <br /> Chloroform ND 5.00 <br /> Chloromethane ND 10.0 <br /> Dibromochloromethane ND 5.00 <br /> 1,3-Dichlorobenzene ND 5.00 <br /> 1,4-Dichlorobenzene ND 5.00 <br /> 1,2-Dichlorobenzene ND 5.00 <br /> 1,1-Dichloroethane ND 5.00 <br /> 1,2-Dichloroethane ND 5.00 <br /> 1,1-Dichloroethene ND 5.00 <br /> cis-1,2-Dichloroethene ND 5.00 <br /> trans-1,2-Dichloroethene ND 5.00 <br /> 1,2-Dichloropropane ND 5.00 <br /> cis-1,3-Dichloropropene ND 5.00 <br /> trans-1,3-Dichloropropene ND 5.00 <br /> Methylene chloride ND 50.0 <br /> 1,1',2,2-Tetrachloroethane ND 5.00 <br /> Tetrachloroethene ND 5.00 <br /> I,I,I-Trichloroethane ND 5.00 <br /> 1,1,2-Trichloroethane ND 5.00 <br /> Trichloroethene ND 5.00 <br /> Trichlorofluoromethane ND 5.00 <br /> Vinyl chloride ND 10.0 <br /> Surrogate: Bromochloromethane 200 214 60.0-140 107 <br /> Surrogate: 2-Chlorotoluene 200 224 60.0-140 112 <br /> LES 9060385-BS1 <br /> Chlorobenzene 6/28/99 400 410 ug/kg 70.0-130 103 <br /> 1,1-Dichloroethane 200 200 70.0-130 100 <br /> Trichloroethene 200 206 70.0-130 103 <br /> Surrogate: Bromochloromethane 200 206 60.0-140 103 <br /> Surrogate: 2-Chlorotoluene 200 210 60.0-140 105 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 5 of S <br />