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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364.9600 FAX(650)364-9233 <br /> 404 N. Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510) 988.9673 <br /> 1„7 Analytical 819 Striker Avenue, Suitt 8 Sacramento,CA 95834 (916) 921.9600 FAX(916)921.0100 <br /> EMCON-Sac Project: Arco 2186,Stockton,CA Sampled: 6/24/98 <br /> 1433 N. Market Blvd, Project Number: 21775-237-002 Received: 6/24/98 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 7/16/98 <br /> Total Purgeable Hydrocarbons(C6-C12), BTEX and 11ME 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 /> Date Preparedred:7/7/9R <br /> Blank $070058-BL K 1 <br /> Purgeable Hydrocarbons 7/7198 ND ug/I 50,0 <br /> Benzene „ ND <br /> Toluene ND 0.500 Ethylbenzene ND 0.5000.500 <br /> Xylenes(total) ND 0.500 <br /> Methyl tert-butyl ether ND 5.00 <br /> Surrogate: a,a,a-Triuorotoluene 10.0 9.80 60.0-140 98.0 <br /> ICS 807,{�SR"BS1 <br /> Benzene 7/7/98 10.0 10.1 ug/1 70.0-130 101 <br /> Toluene 10.0 9.61 70.0-130 96.1 <br /> Ethylbenzene 10.0 9.57 70.0-130 95.7 <br /> enes(total) 30.0 28.6 70.0-130 95.3 <br /> yl tert-butyl ether 10.0 9.80 70.0-130 98.0 <br /> urrogate: a,a,a-Triuorotoluene 10.0 10.1 60.0-140 101 <br /> Matrix Spike 8070058-USI 5806338-01 <br /> Benzene 717/98 10.0 ND 10.0 ug/l 60.0-140 100 <br /> Toluene 10.0 ND 9.59 60.0-140 95.9 <br /> Ethylbenzene 10.0 ND 9.68 60.0-140 96.8 <br /> Xylenes(total) 30.0 ND 28.9 3 <br /> . <br /> 60.0-140 96 <br /> Methyl tert-butyl ether 10.0 ND 13.3 60.0-140 6.3 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.72 150.0-140 97.1 <br /> 8070058-MSD1 Ss06338-01 <br /> Benzene 7/7/98 10.0 ND 9.00 1 <br /> Toluene „ u P� 60.0-140 90.0 25.0 10.5 <br /> 10.0 ND 9.04 60.0-140 90.4 25.0 5.90 <br /> Ethylbenzene 10.0 ND 9.12 60.0-140 91.2 25.0 5.96 <br /> Xylenes(total) 30.0 ND 26.7 60.0-140 89.0 25.0 7.88 <br /> Methyl tert-butyl ether 10.0 ND 7.60 60.0-140 76.0 25.0 54.5 3 <br /> Surrogate: a,a,a-Trifluorotoluene 10,0 9.30 <br /> 60.0-140 93.0 <br /> Batch-, 8070086 Date erepared: 7/7/98 Extrac <br /> Blank 8070086-,BI,K1 <br /> Purgeable Hydrocarbons 7/7/98 ND ug/1 50.0 <br /> Benzene <br /> ND 0.500 <br /> Toluene <br /> Ethylbenzene ND 0.500ND 0.500 <br /> Xylenes(total) " ND 0.500 <br /> C <br /> rt-butyl etherND 5.00 <br /> Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Ronald W Babel,Client Services Representative <br /> Page 6 of 9 <br /> 1991 <br />