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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 /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921.96W 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-Cl2),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 /> $030086-1131,K1 <br /> Surrogate: a,a,a-Trifluorotoluene 7/7/98 10.0 9.53 ug/1 60.0-140 95.3 <br /> L'S 1{07USAJ3S t <br /> Benzene 7/7/98 10.0 <br /> Toluene 9.84 ug/l 70.0-130 98.4 <br /> 10.0 9.34 70.0-130 93.4 <br /> Ethylbenzene 10.0 9.26 70.0-130 92.6 <br /> Xylenes(total) 30.0 27.6 70.0-130 92.0 <br /> Methyl tert-butyl ether 10.0 10.3 70.0-130 103 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.74 60.0-140 97.4 <br /> Matrix ike $42008b-MS1 5806393-09 <br /> Benzene 7/7/98 10.0 ND 9.57 ug/l 60.0-140 95.7 <br /> Toluene 10.0 ND 9.06 60.0-140 90.6 <br /> ]benzene 10.0 ND 9.05 60.0-140 90.5 <br /> nes(total) 30.0 ND 27.0 60.0-140 9 <br /> eth0.0 <br /> yl tert-butyl ether 10.0 ND 13.1 60.0-I40 0. <br /> Surrogate: a,a,a-Trihuorotoluene 31 <br /> 10.0 970 60. 140 910 <br /> Matrix Spike Dup 8470086-MSD1 S806391-09 <br /> Benzene 7/7/98 10.0 ND 9.81 ug/i 60.0-140 98.1 25.0 2.48 <br /> Toluene 10.0 ND 9.30 60.0-140 93.0 25.0 2.61 <br /> Ethylbenzene 10.0 ND 9.23 60.0-I40 92.3 25.0 1.97 <br /> Xylenes(total) 30.0 ND 27.6 25.0 2.20 <br /> 60.0-140 92.0 <br /> Methyl tert-butyl ether 10.0 ND 12.9 60.0-140 2.0 25.0 1.54 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 8.80 60.0-140 88.0 <br /> Oeq,u-oi,aA-naIIytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> j <br /> Ronald W BZe-1,Client Services Representative Page 7 of 9 <br />