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Sequoia 819 Striker Avenue, Suite 8 <br /> Sacramento, CA 95834 <br /> (916) 921-9600 <br /> Analytical FAX(916) 921-0100 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 6117/99 <br /> 9912 Business Park Drive,Ste. 100 Project plumber: 7G600-604-02 Received: 6/17/99 <br /> Sacramento,CA 95827 Pro ect Manager: Rusty Benkosky Reported: 716199 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFT/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_(,conlinuedl 20604Q9-13LKl <br /> Surrogate: a,a,a-Trifluorotoluene 6125199 10.0 9.69 ug/1 60.0-140 96.9 <br /> U-5 906Q409-BSI <br /> Benzene 6/25/99 10.0 9.84 ug/i 70.0-130 98.4 <br /> Toluene 10.0 9.96 70.0-130 99.6 <br /> Ethylbenzene 10.0 10.0 70.0-130 100 <br /> Xylenes(total) 30.0 30.2 70.0-130 101 <br /> Methyl tert-butyl ether 10.0 11.5 70.0-130 115 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 IOJ 60.0-140 101 <br /> LCS Dup 9060409-BSD1 <br /> Benzene 6/25/99 10.0 9.64 ug/l 70.0-130 96.4 25.0 2.05 <br /> Toluene 10.0 9.67 70.0-130 96.7 25.0 2.95 <br /> benzene 10.0 9.81 70.0-130 98.1 25,0 1.92 <br /> M- Wes(total) 30.0 29.4 70.0-130 98.0 25.0 3.02 <br /> Methyl tert-butyl ether 10.0 11.5 70.0-130 115 25.0 0 <br /> Surrogate: a,a,a-Trifluorotoluene " 10.0 9.19 " 60.0-140 91.9 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and def nitions. <br /> Page 13 of 21 <br />