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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> a- ) <br /> Analytical 819 Striker Avenue.Suite 8 Sacramento.CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd.North,Ste.D Petatuma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 2/16/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 2/17/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/3/99 <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 /> Blank(continued) 9020304-BLKI <br /> 1,1-Dichloroethene 2/26/99 ND ug/l 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-Isopropyltoluene ND 2.00 <br /> Methylene chloride ND 5.00 <br /> Naphthalene ND 5.00 <br /> Propylbenzene ND 2.00 <br /> AM rene ND 2.00 <br /> I,1,2-Tetrachloroethane ND 2.00 <br /> 1,1,2,2-Tetrachloroethane ND 2.00 <br /> Tetrachloroethene ND 2.00 <br /> Toluene ND 2.00 <br /> 1,2,3-Trichlorobenzene ND 2.00 <br /> 1,2,4-Trichlorobenzene ND 2.00 <br /> l,1,1-Trichloroethane ND 2.00 <br /> 1,1,2-Trichloroethane ND 2.00 <br /> Trichloroethene ND 2.00 <br /> Trichlorofluoromethane ND 5.00 <br /> 1,2,3-Trichloropropane ND 2.00 <br /> 1,2,4-Trimethylbenzene ND 2.00 <br /> 1,3,5-Trimethyl benzene ND 2.00 <br /> Vinyl chloride ND 2.00 <br /> Total Xylenes ND 2.00 <br /> Surrogate: Dibromofluoromelhane 50.0 55.0 70.0-130 110 <br /> Surrogate: 1,2-DCA-d4 50.0 56.4 70.0-130 113 <br /> Surrogate: Toluene-d8 50.0 53.0 70.0-130 106 <br /> Surrogate: 4-BFB 50.0 47.6 70.0-130 95.2 <br /> LCS 9020304-BS1 <br /> Benzene 2/26199 50.0 54.8 ug/l 70.0-130 110 <br /> Chlorobenzene 50.0 49.8 70.0-130 99.6 <br /> l,l-Diehloroethene 50.0 52.0 70.0-130 104 <br /> Toluene 50.0 50.0 70.0-130 100 <br /> richloroethene 50.0 44.2 70.0-130 88.4 <br /> eguoia Analytical -Sacramento *Refer to end of report for text of notes and definitions. <br /> andra R. Hanson,Client Services Representative Page 16 of 20 <br />