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819 Striker Avenue,Suite 8 <br /> Sequoia SdCrdrn 916 92 -96W <br /> (916)92 t-9600 <br /> FAX(916)921-0100 <br /> Analytical www.sequoialabs.com <br /> SECOR International-Rancho Cordova Project: ARCO 4493, Stockton,CA Sampled: 6119100 <br /> 3017 Kilgore Road,Suite I00 Project Number: N/A Received. 6123/00 <br /> Rancho Cordova,CA 95670 Project Manager: Rusty Benkosky Reported: 716/00 <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) 0060255-BLK1 <br /> Styrene 6/27/00 ND ug/1 2.00 <br /> 1,1,1,2-Tetrachloroethane ND 2.00 <br /> 1,1,2,2-Tetrachloroethane ND 2.00 <br /> Tetrachloroethene ND 2.00 <br /> Toluene ND 2.00 <br /> 1,2,3-Trichlorobenzene ND " 2.00 <br /> 1,2,4-Trichlorobenzene ND 2,00 <br /> 1,1,1-Trichloroethane ND 2.00 <br /> 1,1,2-Trichloroethane ND 2.00 <br /> Trichloroethene ND 2.00 <br /> Trichlorofluoromethane ND 5.00 <br /> 1,2,3-Trichloropropane ND 2.00 <br /> 1,2J.-Tr methylbenzene ND 2.00 <br /> 1, (methylbenzene ND 2.00 <br /> Vt chloride ND 2.00 <br /> Total Xylenes ND 2.00 - <br /> Surrogate: Dibromofluoromethane 50.0 55.8 60.0-140 112 <br /> Surrogate: 1,2-DCA-d4 50.0 64.0 60.0-140 128 <br /> Surrogate: Toluene-d8 50.0 54.2 60.0-140 108 <br /> Surrogate: 4-BFB 50.0 52.0 60.0-140 104 <br /> lank 0060255-BLK2 <br /> Benzene 6/28/00 ND ug/I 2.00 <br /> Bromobenzene ND 2.00 <br /> Bromochloromedme ND 2.00 <br /> Bromodichloromethane ND " 2.00 <br /> Bromoform ND 2.00 <br /> Bromomethane ND 5.00 <br /> n-Butylbenzene ND 2.00 <br /> sec-Butylbenzene ND 2.00 <br /> tert-Butylbenzene ND 2.00 <br /> Carbon tetrachloride ND 2.00 <br /> Chlorobenzene ND 2.00 <br /> Chloroethane ND 5.00 <br /> Chloroform ND 2.00 <br /> Chloromcthane ND 5.00 <br /> 2-Chlorotoluene " ND 2.00 <br /> 4-Chlorotoluenc ND 2.00 <br /> Dibromochloromethane ND 2.00 <br /> 1,2-Dibromoethane ND 2.00 <br /> *P methane ND 2.00 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 20 of 26 <br />