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Chesapeake Loa Walnut CA 94 <br /> 680 DriveRedwood <br /> oCity,CA <br /> 83 <br /> Sequoia 404 N. (M)988-9600 FAX(925)988-%73 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (9 16)921-9600 FAX(91(5)921-0100 <br /> 1455 cDowel <br /> Peta <br /> Analytical 1551 Induust al(Road North,Ste. D San 1Carlos. A 94070-4111 (6 0)232-19600 FAX(650)232-9642 <br /> i <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 4/13/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 4/14199 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 4/28199 <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 /> Blank(continued) 9040173-BLKI <br /> Styrene 4/15/99 ND ug/kg 100 <br /> 1,1,1,2-Tetrachloroethane ND 100 <br /> 1,1,2,2-Tetrachloroethane ND 100 <br /> Tetrachloroethene ND 100 <br /> Toluene ND 100 <br /> 1,2,3-Trichlorobenzene ND 100 <br /> 1,214-Trichlorobenzene ND 100 <br /> 1,1,1-Trichloroethane ND 100 <br /> 1,1,2-Trichloroethane ND 100 <br /> "Trichloroethene ND 100 <br /> Trichlorofluoromethane ND 500 <br /> 1,2,3-Trichloropropane ND 100 <br /> 1,2,4-Trimethylbenzene ND I00 <br /> 5-Trimethylbenzene ND 100 <br /> Y <br /> chloride ND 500 <br /> tal Xylenes ND 100 <br /> Surrogate: Dibromofluoromethane 2500 2300 70.0-130 92.0 <br /> Surrogate: 1,2-DCA-d4 2500 2470 70.0-130 98.8 <br /> Surrogate: Toluene-d8 2500 2580 70.0-130 103 <br /> Surrogate: 4-BFB " 1500 2220 " 70.0-130 88.8 <br /> LCS 9040173-BS 1 <br /> Benzene 4/15/99 2500 2390 ug/kg 70.0-130 95.6 <br /> Chlorobenzene " 2500 2360 70.0-130 94.4 <br /> 1,1-Dichloroethene 2500 2070 70.0-130 82.8 <br /> Toluene 2500 2370 11 70.0-130 94.8 <br /> Trichloroethene 2500 2200 70.0-130 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 /> Matrix Spike 9040173-MS1 S904159-02 <br /> Benzene 4/15/99 2500 394 2180 ug/kg 60.0-140 71.4 <br /> Chlorobenzene 2500 ND 2150 60.0-140 86.0 <br /> 1,l-Dichloroethene 2500 ND 1820 60.0-140 72.8 <br /> Toluene 2500 776 2180 60.0-140 56.2 2 <br /> Trichloroethene 2500 ND 1980 60.0-140 79.2 <br /> Surrogate: Dibrotnofluoromethane 2500 2170 70.0-130 86.8 <br /> Surrogate: 1,1-DCA-d4 2500 2180 1170.0-130 87.2 <br /> Surrogate: Toluene-d8 2500 2360 70.0-130 94.4 <br /> uoia Analytical -Sacramento *Refer to end of report far text of notes and definitions. <br /> id,X,( <br /> Hanson,Client Services Representative Page 16 of 19 <br />