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680 Chesapeake Drive Redwood Clty CA 94063 (650)364 9600 FAX(650)364-9233 <br /> Sequoia 444 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1411 <br /> 865 FAX(707)792-032 <br /> Analytical 1551 Ind�rialll oaavdd North Ste D San Carlos CA 94070-4111 (650)232-luma CA 94954 (707) 9600 FAX(650)232-9642 <br /> SECOR International Project ARCO 2093,Tracy,CA Sampled 5114/99 <br /> 9912 Business Park Drive,Ste 100 Project Number 7G600-604-02 Received 5/14/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 5/28/99 <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. 9050267 Date Prepared, 5121.L99 Extraction Method, 503Q]3(PIT) <br /> Blank 9050267-BLK1 <br /> Purgeable Hydrocarbons 5/21/99 ND ug/I 500 <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-Trifluorotoluene /00 806 600-140 806 <br /> US 9050267-BSI <br /> Benzene 5/21/99 100 887 ug/l 700-130 887 <br /> Toluene 100 905 700-130 905 <br /> Ethylbenzene 10 0 891 700-130 89 1 <br /> Xylenes(total) 300 270 700-130 900 <br /> NAllift tert-butyl ether 100 964 700-130 964 <br /> S ate a s a-Trifluorotoluene /00 812 600-140 812 <br /> Matrix Spike 9050267-MSI S905205-01 <br /> Benzene 5/21/99 1010 ND 845 ug/1 600-140 84 5 <br /> Toluene 100 ND 856 600-140 856 <br /> Ethylbenzene 100 ND 858 600-140 858 <br /> Xylenes(total) 300 ND 26 0 600-140 867 <br /> Methyl tert-butyl ether 10 0 ND 10 4 600-140 104 <br /> Surrogate a s a-Trifluorotoluene FF100 748 600-140 748 <br /> Matrix Spike Duo 9050267-MSDI S905205-01 <br /> Benzene 5121199 10 0 ND 955 ug/1 600-140 955 25 0 12 2 <br /> Toluene 100 ND 936 600-140 93 6 25 0 893 <br /> Ethylbenzene 100 ND 938 600-140 938 25 0 891 <br /> Xylenes(total) 300 ND 28 4 600-140 947 25 0 8 82 <br /> Methyl ten-butyl ether 100 ND 11 3 600-140 113 25 0 829 <br /> Surrogate a a a-Trifluorotoluene 100 836 600-140 83 6 <br /> S Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Sandra R 'Hanson,Client Services Representative Page 4 of 5 <br />