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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 Sinker Avenue Sulte 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) 792-0342 <br /> 1551 Industrial Road San Carlos CA 94070 4 t It (650)232 9600 FAX(650)232 9612 <br /> SECOR International Project ARCO 2133,Stockton,CA Sampled 3/18/99 <br /> 9912 Business Park Drive,Ste 100 Project Number 7G600-019-04 Received 3118/99 <br /> Sacramento,CA 95827 Pro ect Manager Rusty Benkosky Reported 3/23/99 <br /> Volatile Organic Compounds by EPA Method 8010B/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Matrix Spike 9030283 MSI 5903250-01 <br /> Chlorobenzene 3/22199 400 ND 520 ug/kg 600-140 130 <br /> l,I-Dichloroethane 200 ND 218 600-140 109 <br /> Trichloroethene 200 ND 238 600-140 119 <br /> Surrogate Bromochloromethane 200 262 600-140 1.31 <br /> Surrogate 2-Chlorotoluene 200 254 600-140 127 <br /> Matrix Spike Duo - S903250-01 <br /> Chlorobenzene 3/22/99 400 ND 530 ug/kg 600-140 133 250 2 28 <br /> 1 1-Dichloroethane 200 ND 218 600-140 109 250 0 <br /> Trichloroethene 200 ND 240 600-140 120 250 0 837 <br /> Surrogate Bromochloromethane 200 282 600-140 141 2 <br /> Surrogate 2-Chlorotoluene 200 260 600-140 130 <br /> 0 <br /> STequoia Analytical- Sacramento *Refer to end of report for text of notes and defuntions <br /> SandM,�nsn.Client Services Representative Page 8 of 9 <br />