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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N.W1get lane Walnut Creek.CA 94598 (92 5)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue.Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> [455 McDowell Blvd.North,Ste. D Petaluma,CA 94954 (707) 792-1865 FAX(707) 792-034Z <br /> 1 MOON -Sac Projecr. ARCO 218G, Stockton,CA Sampled: 9/21111 <br /> 1433 N. Market Blvd. Projecr Number: 2]775-237-002 Received: 9121 <br /> /98 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 1018/98 <br /> Volatile Organic Compounds by EPA Method 8260A/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 /> 30tch: 8i0f1D-aLLFT-cmired: 10/5/98 Extraction Method: EPA 5020B.IMI <br /> 111Uk 8100048-B I,}u <br /> ithanol 10/5/98 IND ug/I 3000 <br />'ert-butyl alcohol ND 200 <br /> 4ethyl tert-butyl ether ND 2.00 <br />)i-isopropyl ether " ND " 2.00 <br /> ithyl Cert-butyl ether ND 2.00 <br />'ert-amyl methyl ether ND " 2.00 <br /> urrogate: 1,2-DCA-d4 50.0 41.0 1060.0-140 82.0 <br /> $L4Q048-BSI <br /> tethyl tert-butyl ether 10/5/98 50.0 67.8 ug/I 70.0-130 136 3 <br /> arrogate: 1,2-DCA-d4 1150.0 47.7 60.0-140 95.4 <br /> ca 8100948-BS2 <br />[ethyl tent-butyl ether 10/2/98 50.0 54.4 ug/l 70.0-130 109 <br /> irrogate: 1,2-DCA-d4 50.0 54.4 60.0-140 109 <br /> CS Dup 8100048-BSD2 <br />'ethyl tert-butyl ether 10/2/98 50.0 44.2 ug/1 70.0-130 88.4 25.0 20.9 <br /> errogate: 1.2-DCA-d4 50.0 62.7 60.0-140 125 <br /> luoia Analytical Sacramento *Refer to end of report for text of notes and definitions. <br />� Y 4 L l ` <br />,aid W Bobel,Client Services Representati e <br /> Page 7 of 8 <br />