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Sequoia 819 Straker Avenue Suite 8 <br /> 4D Sacramento CA 95834 <br /> (916)921-9600 <br /> Analytical <br /> FAX(916)921-0100 <br /> SECOR International Project ARCO 2133 Stockton,CA Sampled 6/22199 <br /> 9912 Business Park Drive,Ste 100 Project Number 7G600-604-02 Received 6122/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 7/8/99 <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 /> Batch, 9070060 Date Prepared. 712/99 Extraction Method EPA 50 (PLT) <br /> Blank 9070060-BLK 1 <br /> Purgeable Hydrocarbons 7/2/99 ND ug/l Soo <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tert-butyl ether ND 500 <br /> Surrogate a a a-Trifluorololuene too 877 600-140 877 <br /> LCS 9070060-BSI <br /> Benzene 712199 100 9 92 ug/I 700-130 992 <br /> Toluene 100 104 700-130 104 <br /> Ethylbenzenc 100 104 700-130 104 <br /> X es(total) 300 28 3 700-130 943 <br /> l tert-butyl ether 100 11 4 700-130 114 <br /> SWRgate aaa-Triuorotoluene 1190 901 600-140 901 <br /> Matrix S pi lk 9070060-MSI 5906357-01 <br /> Benzene 712/99 10 0 ND 988 ug/l 600-140 988 <br /> Toluene 10 0 ND 105 600-140 105 <br /> Ethylbenzene 10 0 ND 104 600-140 104 <br /> Xylenes(total) 300 ND 282 600-140 940 <br /> Methyl tert-butyl ether 100 ND 12 0 600-140 120 <br /> Surrogate a a a-Trifluorotoluene loo 883 600-140 883 <br /> Matrix Spike iM 9070060-MSDI 5206357-01 <br /> Benzene 7/2/99 100 ND 995 ug/l 600-140 995 250 0 706 <br /> Toluene 100 ND 10 1 600-140 101 25 0 3 88 <br /> Ethylbenzene 100 ND 106 600-140 106 25 0 190 <br /> Xylenes(total) 300 ND 286 600-140 95 3 25 0 137 <br /> Methyl tert-butyl ether 100 ND 123 600-140 123 25 0 247 <br /> Surrogate a a,a-Trifluorololuene too 836 600-140 836 <br /> Batch, 9070065 Date Prepared, 712199 Extraction Method, EPA 5030B(P/T) <br /> Ill lan 9070065-BLK1 <br /> Purgeable Hydrocarbons 7/2/99 ND ug/I Soo <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tert-butyl ether ND Soo <br /> SeqWa Analytical-Sacramento "Refer to end of report for text of notes and definitions <br /> Page 4 of 7 <br />