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y <br /> 819 Striker Avenue, Sulte 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical <br /> FAX(9!6)92 i-0100 <br /> SECOR International-Sacramento Project: ARCO 4493, Stockton,CA Sampled: 9/24/99 <br /> 9912 Business Park Dr.,Ste. 100 Project Number: 077.41844.012 Received. 9/24/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 10/8/99 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LOFT/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) 909032_2-BLK1 <br /> Surrogate: o,a,a-Trifluorotoluene 9/29/99 10.6 11.3 ug/1 60.0-140 113 <br /> LCS 9090322-BSI <br /> Benzene 9/29/99 10.0 9.93 ug/1 70.0-130 99.3 <br /> Toluene 10.0 9.73 70.0-130 97.3 <br /> Ethylbenzene 10.0 9.79 70.0-130 97.9 <br /> Xylenes(total) 30.0 27.9 70.0-130 93.0 <br />_Methyl tert-butyl ether " 10.0 _ _ ---9.71 " __ 70.0_-130 97.1 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 11.3 60.0-140 113 <br /> Matrix Spike 9090322-MSI 5909366-02 <br /> Benzene 9/29/99 10.0 ND 9.93 ug/1 60.0-140 99.3 <br /> Toluene 10.0 ND 9.77 60.0-140 97.7 <br /> benzene 10.0 ND 9.79 60.0-140 97.9 <br /> WWaes(total) 30.0 ND 26.5 60.0-140 88.3 <br /> Methyl tert-butyl ether _ _ 10.0 ND 10.8 60.0-140 108 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 11.1 60.0-140 111 <br /> Matrix Spike Dup 9090322-MSD1 5909366-02 <br /> Benzene 9/29199 10.0 ND 9.89 ug/1 60.0-140 98.9 25.0 0.404 <br /> Toluene 10.0 ND 9.28 60.0-140 92.8 25.0 5.14 <br /> Ethylbenzene 10.0 ND 9.84 60.0-140 98.4 25.0 0.509 <br /> Xylenes(total) 30.0 ND 26.8 60.0-140 89.3 25.0 1.13 <br /> Methyl tert-butyl ether 10.0 ND 10.6 60.0-140 106 25.0 _ 1.87 <br /> Surrogate: a,a,a-Trifluorololuene 10.0 11.2 60.0-140 112 <br /> 0 <br /> Sequoia Analytical-Sacramento *Refer to end ofreport for text of notes and definitions. <br /> Page 8 of 14 <br />