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4DSequoia 819 Striker Avenue,Suite 8 Sacramento, CA 95834 I%ff Analytical (916)921-9600 FAX(916)921-0100 SECOR International Project: ARCO 4493, Stockton,CA Sampled: 6/17199 9912 Business Park Drive,Ste. 100 Project Number: 7G600-604-02 Received: 6/17/99 Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 7/6199 Volatile Organic Compounds by EPA Method 8260A/Quality Control Sequoia Analytical-Sacramento Date Spike Sample QC Reporting Limit Recov. RPD RPD Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* LCS Dup( nntmm&d) 9060372-BSD1 Surrogate: Dibromofluoromethane 6/14/99 50.0 50.0 ug/I 70.0-130 100 Surrogate: 1,2-DCA44 50.0 50.0 70.0-130 100 Surrogate: Toluene-d8 50.0 52.0 70.0-130 104 Surrogate: 4-BFB 50.0 41.6 70.0-130 83.2 Matrix Spike 9060372-MSI S906385-01 Benzene 6124199 50.0 ND 49.4 ug/l 60.0-140 98.8 Chlorobenzene 50.0 ND 50.6 60.0-140 101 1,1-Dichloroethene 50,0 ND 47.2 60.0-140 94.4 Toluene 50.0 ND 52.0 60.0-140 104 Trichloroethene 50.0 ND 46.4 60.0-140 92.8 Surrogate: DibromoJluoromethane 50.0 51.4 70.0-130 103 Surrogate: 1,2-DCA-d4 50.0 51.4 70.0-130 103 gate: Toluene-d8 1, 50.0 52.6 70.0-130 105 gate: 4-BFB 50.0 41.4 70.0-130 82.8 Matrix.Spike Duo S906385-01 Benzene 6/24/99 50.0 ND 50.0 ug/I 60.0-140 I00 25.0 1.21 Chlorobenzene 50.0 ND 50.8 60.0-140 102 25.0 0.985 1,1-Dichloroethene 50.0 ND 47.6 60.0-140 95.2 25.0 0.844 Toluene 50.0 ND 52.8 60.0-140 106 25.0 1.90 Trichloroethene 50.0 ND 47.2 60.0-140 94.4 25.0 1.71 Surrogate: Dibromofluoromethane 50.0 51.2 70.0-130 102 Surrogate: 1,2-DCA44 50.0 51.6 70.0-130 103 Surrogate, Toluene-d8 50.0 52.2 70.0-130 104 Surrogate: 4-BFB 50.0 41.6 70.0-130 83.2 .0 Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. Page 18 of 21