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819 Striker Avenue,Suite 8 ` <br /> Sequoia Sacramento, -9600 <br /> (916)92 921-9600 <br /> FAX(9 16)921-0100 <br /> Analyticalwww.sequoialabs.com <br /> SECOR International-Rancho Cordova Project: ARCO 4493,Stockton,CA Sampled: 5/8/00 <br /> 3017 Kilgore Road,Suite 100 Project Number: N/A Received: 5110/00 <br /> Rancho Cordova,CA 95670 Project Mana er: Ru Benkosky Reported: 5118100 <br /> Volatile_Organic_Compounds-by_EPAMethod:8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> IAnalyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> _Matrix Spike(continued) 0050147-MSI S005157-25 <br /> Surrogate: 4-BFB 5/12/00 2.50 2.09 mg/kg 60.0-140 83.6 <br /> Matrix Spike Dup 0050147-MSD1 5005157-25 <br /> Benzene 5/12100 2.50 ND 2.36 mg/kg 60.0-140 94.4 25.0 2,10 <br /> Chlorobenzene 2.50 ND 2.40 60.0-140 96.0 25.0 0.830 <br /> 1,I-Dichloroethene 2.50 ND 2.36 60.0-140 94.4 25.0 1.71 <br /> Toluene 2.50 ND 2.52 60.0-140 101 25.0 0 <br /> Trichloroethene 2.50 ND 2.32 60.0-I40 92.8 25.0 1.30 <br /> Surrogate: Dibromofluoromethane 2.50 2.43 60.0-140 97.2 <br /> Surrogate: 1,2-DCA-d4 2.50 2.64 60.0-140 106 <br /> Surrogate: Toluene-d8 2.50 2.47 60.0-140 98.8 <br /> Surrogate: 4-BFB 2.50 2.07 60.0-140 82.8 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and def ndtions. <br /> Page 19 of 22 <br />