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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 /> Analytical 1455 McDowell Blvd.North.Ste.D Petaluma.CA 94954 (707)792-1865 FAX(707)79Z-0342 <br /> SECOR International Project: ARCO 4493, Stockton,CA Sampled: 2/16199 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 2117199 <br /> Sacramento, CA 95827 Project Manager: Rusty Benkosky Re orted: 313199 <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 /> LCS(continued) 9020304-BS1 <br /> Surrogate: DibromoJluoromelhane 2126199 50.0 53.2 ugly 70.0-130 106 <br /> Surrogate: 1,2-DCA-d4 50.0 54.8 70.0-130 110 <br /> Surrogate: Toluene-d8 50.0 51.2 70.0-130 102 <br /> Surrogate: 4-BFB 50.0 47.4 70.0-130 94.8 <br /> Matrix Spike 9020304-MSI 5902327-14 <br /> Benzene 2126199 50.0 ND 54.8 ug/l 60.0-140 110 <br /> Chlorobenzene 50.0 ND 50.6 60.0-140 101 <br /> I,1-Dichloroethene 50.0 ND 55.6 60.0-140 111 <br /> Toluene 50.0 ND 51.0 60.0-140 102 <br /> Trichloroethene 50.0 ND 41.4 60.0-140 82.8 <br /> Surrogate: Dibromofluoromethane 50.0 58.6 70.0-130 117 <br /> Surrogate: 1,2-DCA-d4 50.0 56.4 70.0-130 113 <br /> rrogate: Toluene-d8 50.0 49.4 70.0-130 98.8 <br /> JWmgate: 4-BFB 50.0 46.0 70.0-130 92.0 <br /> Matrix Spike Dun 9020304-MSI)1 5902327-14 <br /> Benzene r 2126/99 50.0 ND 56.8 ug/l 60.0-140 114 25.0 3.57 <br /> Chlorobenzene 50.0 ND 51.0 60.0-140 102 25.0 0.985 <br /> 1,1-Dichloroethene 50.0 ND 55.4 60.0-140 111 25.0 0 <br /> Toluene 50.0 ND 51.2 60.0-140 102 25.0 0 <br /> Trichloroethene 50.0 ND 43.8 60.0-140 87.6 25.0 5.63 <br /> Surrogate. Dibromofluoromeihane 50.0 58.4 70.0-130 117 <br /> Surrogate: 1,2-DCA-d4 50.0 57.2 70.0-130 114 <br /> Surrogate: Toluene-d8 50.0 51.4 70.0-130 103 <br /> Surrogate: 4-BFB 50.0 47.4 70.0-130 94.8 <br /> 'qWquoia Analytical -Sacramento *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson, Client Services Representative Page 17 of 20 <br />