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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 (925)988-9600 FAX(92 5)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd.North, Ste. D Petaluma,CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> EMCON -Sac Project: ARCO 2186, Stockton,CA Sampled: 9/21/98 <br /> 1433 N. Market Blvd. Project Number: 21775-237-002 Received: 9/2[/98 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 10/819$ <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT/Quality Control <br /> Sequoia AnaiyticaI - Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RAD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Blauk(son ' tern 8090287-131AI <br /> Surrogate: a,a,a-Trifluorotoluene 9/15/98 10.0 8.94 u9/1 60.0-140 89.4 - <br /> LCS 8090287-BSI <br /> 3enzene 9/25/98 10.0 10.8 ug/I 70.0-130 108 <br /> Toluene 10.0 10.1 70.0-130 101 <br /> 3thylbenzene 10.0 9.94 70.0-130 99.4 <br /> Kylenes(total) 30.0 29.6 70.0-130 98.7 <br /> Aethyl tert-butyl ether 10.0 1 1.2 70.0-130 112 <br /> surrogate: o,a,a-Trifluorotoluene 10.0 8.88 60.0-140 88.8 <br /> datrix Spik 80902L87-1VISI .SB09246-06 <br /> 3enzene 9/25/98 t 0.0 ND 10.7 ug/l 60.0-140 107 <br /> jot " 10.0 ND 10.2 60.0-140 102 <br /> th ene 10.0 ND 10-1 60.0-140 101 <br /> Cylenes(total) 30.0 ND 30.4 60.0-140 101 <br /> Aethyl cert-butyl ether 10.0 ND 10.6 60.0-140 106 <br />'urrogate: a,a,a-Trifluorotoluene 10.0 8.85 60.0-140 88.5 <br /> 9atrix Spike DiLil RU0287-MSDI SB09246-06 <br /> lenzene 9/25/98 10.0 ND 10.6 ug/l 60.0-140 106 25.0 0.939 <br />'oluene 10.0 ND 9.66 60.0-140 96.6 25.0 5.44 <br />,thylbenzene 10.0 ND 9.92 60.0-140 99.2 25.0 1.80 <br /> xylenes(total) 30.0 ND 29.9 60.0-140 99.7 25.0 1.30 <br /> lethyl tert-butyl ether 10.0 ND 10.6 60.0-140 106 25.0 0 <br /> urrogate: a,a,a-Tris luorotoluene 10.0 8.77 60.0-140 87.7 <br /> • <br />:quoia Analytical -Sacramento *Refer to end of report for text of notes and definitions. <br /> mald W Sobel,Client Services Representative <br /> Page 6 of 8 <br />