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Sequoia 680 Chesapeake Drive Redwood City CA 94063 <br /> (650) 364 9600 FAX(650)364 4233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> i <br /> EMCON-Sac Project Arco 548,Stockton,CA Sampled 6/23/98 <br /> 1433 N Market Blvd Project Number 21775-206 003 Received 6/24/98 <br /> Sacramento CA 95834 Project Manager Dave Foley Reported 7/11/98 <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. 8071103'1 Urate Prepared. 712198 Extraction Method, EPA31afflJoyQ <br /> Blank 8070033-B1.K1 <br /> Purgeable Hydrocarbons 7/2/98 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-Tnfluorotoluene 100 104 600-140 104 <br /> LCS 8070033= <br /> Benzene 7/2/98 10 0 103 ug/l 700-130 103 <br /> Toluene too 9 83 700-130 98 3 <br /> Ethylbenzene 100 962 700-130 962 <br /> X lenes(total) 300 288 700-130 960 <br /> yl tert-butyl ether <br /> 100 8 76 700-130 876 <br /> agate a a a-Trifluorotoluene 100 106 600-140 106 <br /> Matrix Spike 8070033mS1 S806297-08 <br /> Benzene 7/2/98 100 ND 9 03 ug/l 600-140 903 <br /> Toluene 100 ND 8 66 600-140 866 <br /> Ethylbenzene 100 ND 845 600-140 845 <br /> Xylenes(total) 300 ND 25 4 600-140 84 7 <br /> Methyl tert-butyl ether too ND 9 12 600-140 91 2 <br /> Surrogate a s a-Tnfluorotoluene 100 9 85 600-140 98 5 <br /> S806797-OR <br /> Benzene 7/2198 100 ND 101 ug/l 600-140 101 25 0 11 2 <br /> Toluene 100 ND 974 600-140 974 250 11 7 <br /> Ethylbenzene too ND 946 600-140 946 25 0 113 <br /> Xylenes(total) 300 ND 28 4 600-140 947 250 11 1 <br /> Methyl tent-butyl ether 100 ND 932 600-140 93 2 25 0 2 17 <br /> Surrogate a s a-Tnfluorotoluene 100 956 600-140 95 6 <br /> Batch. 8070055Date Prepared. 7/6198 Extra!Ction Method. EPA 5030B(ELD <br /> Bl2nk 8070056-BLK1 <br /> Purgeable Hydrocarbons 7/6/98 ND ug/1 500 <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 /> 'IWota Analytical-Sacramento *Refer to end ofreport for text ofnotes and definitions <br /> Ronald W Bobel,Client Services Representative Page 4 of 6 <br /> rR <br />