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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 /> 819 Striker Avenue,Suite 8 Sacramento.CA 95834 (916)921-9600 FAX(916)921-0100 <br /> a- ) Analytical 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> i <br /> SECOR Intemational Project: ARCO 4493, Stockton,CA Sampled: 2116/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 2/17/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/3199 <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 /> IAnalyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Matrix Spil«(continued) 9020207-Mal ,5102230-OL <br /> Surrogate: 4-BF8 2118199 50.0 44.8 ugR 70.0-130 89.6 <br /> Matrix Spike Dun - S902230-01 <br /> Benzene 2/18/99 50.0 ND 51.4 ug/l 60.0-140 103 25.0 0 <br /> Chlorobenzene 50.0 ND 50.8 60.0-140 102 25.0 198 <br /> 1,1-Dichloroethene 50.0 ND 54.4 60.0-140 109 25.0 1.85 <br /> Toluene 50.0 ND 51.0 60.0-140 102 25.0 1.98 <br /> Trichloroethene 50.0 ND 44.2 60.0-140 88.4 25.0 0.454 <br /> Surrogate: Dibromofluoromethane 50.0 56.6 " 70.0-130 113 <br /> Surrogate: 1.2-DCA-d4 50.0 54.4 70.0-130 109 <br /> Surrogate: Toluene-d8 50.0 50.0 70.0-130 100 <br /> Surrogate: 4-BFB 50.0 44.4 70.0-130 88.8 <br /> Aiatch: 9020304 Date Prepared: 2126199 Extraction Method: FPA 50 OB <br /> 2020304-$I,K] <br /> enzene 2/26199 ND ugll 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 /> Chloroform 3.68 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 /> IJ-Dichloroethane ND 2.00 <br /> Dichloroethane ND 2.00 <br /> Te uoia Analytical -Sacramento *Re er to end of report for text of notes and definitions. <br /> q Y .f <br /> Sandra R. Hanson,Client Services Representative Page 15 of 20 <br />