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680 Chesapeake Drive Redwood City,CA 94063 (65C; 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 4D 819 Striker Avenue,Suite 8 Sacramento.CA 95834 (916)921-9600 FAX(916)921-0 100 <br /> 455 McDowell Blvd.North,Ste. D Petaluma,CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> Analytical ',551 Industrial Road San Carlos,CA 94070-41 11 (650) 232-9600 FAX(650) 232-9612 <br /> SBCOR International Project: ARCO 4493, Stockton,CA Sampled: 4/13/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 4/14/99 <br /> Sacramento,CA 95827 Project Manager: RustX Benkosky Reported: 4/19/99 <br /> Volatile Organic Compounds by EPA Method 8240B/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 /> 131ank(Kontinued) 9040173-BLKI <br /> Surrogate: 4-BFB 4/15199 2500 2220 ug/kg 70.0-130 88.8 <br /> LSU 9040173-BSI <br /> Benzene 4/15199 2500 2390 ug/kg 60.0-140 95.6 <br /> Chlorobenzene 2500 2360 60.0-140 94.4 <br /> 1,1-Dichloroethene 2500 2070 60.0-140 82.8 <br /> Toluene 2500 2370 60.0-140 94.8 <br /> Trichloroethene 2500 2200 60.0-140 88.0 <br /> Surrogate: Dibromofluoromethane 2500 2350 70.0-130 94.0 <br /> Surrogate: 1,2-DCA-d4 2500 2480 70.0-130 99.2 <br /> Surrogate: Toluene-d8 2500 2630 70.0-130 105 <br /> Surrogate: 4-BFB 2500 2280 70.0-130 91.2 <br /> AdlLatrix Spike 9040173-MS 1 5904159-U <br /> >Izene 4/15199 2500 394 2180 ug/kg 70.0-130 71.4 <br /> Chlorobenzene 2500 ND 2150 70.0-130 86.0 <br /> I,l-Dichloroethene 2500 ND 1820 70.0-130 72.8 <br /> Toluene 2500 776 2180 70.0-130 56.2 3 <br /> Trichloroethene 2500 ND 1980 70.0-130 79.2 <br /> Surrogate: Dibromofluoromethane 2500 2170 70.0-130 86.8 <br /> Surrogate: 1,2-DCA-d4 2500 2180 70.0-130 87.2 <br /> Surrogate: Toluene-d8 2500 2360 70.0-130 94.4 <br /> Surrogate: 4-BFB 2500 2040 70.0-130 81.6 <br /> Matrix Spike Dun 9040173-MSD1 5904159-02 <br /> Benzene 4/15199 2500 394 2180 ug/kg 70.0-130 71.4 25.0 0 <br /> Chlorobenzene 2500 ND 2180 70.0-130 87.2 25.0 1.39 <br /> 1,1-Dichloroethene 2500 ND 1850 70.0-130 74.0 25.0 1.63 <br /> Toluene 2500 776 2180 70.0-130 56.2 25.0 0 3 <br /> Trichloroethene 2500 ND 1990 70.0-130 79.6 25.0 0.504 <br /> Surrogate: Dibromofluoromethane 2500 2260 70.0-130 90.4 <br /> Surrogate: 1,2-DCA-d4 2500 2230 70.0-130 89.2 <br /> Surrogate: Toluene-d8 2500 2370 70.0-130 94.8 <br /> Surrogate: 4-BFB 2500 2090 70.0-130 83.6 <br /> equoia Analytical -Sacramento *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson,Client Services RepresentatPage 10 of 12 <br />