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Sequoia 6110 Chesapeake Drive Redwood City,CA 94063 (650) 364.9600 FAX(650) 364-9233 <br /> 404 N.Wiget lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> Analytical "I Striker Avenue,Suite 8 Sacramento.CA 95834 (916)921-9600 FAX(916)921-OIOo <br /> 1455 McDowelt Blvd.North,Ste. D Petaluma,CA 94954 (707) 79Z-1865 FAX(707)792-0342 <br /> EMCON -Sac Project: ARCO 2186, Stockton,CA <br /> 1433 N. Market Blvd. Sampled: 12/14/98 <br /> Project Number: 2!775-237-003 Received: 12/15/98 <br /> Sacramento,CA 95834 Project Manager: Dave Foley <br /> Reported: <br /> Total Purgeable Hydrocarbons(C6-C!2), BTEX and MTBE by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RP DD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit °/a Notes" <br /> 81202 - .K1 <br /> Surrogate: a,a,a-Tr�uorotoluene 11/17/9$ 10.0 <br /> 10.1 ug/1 60.0-140 101 <br />:`� $120266�BS 11 <br /> 3enzene 12/17/98 10.0 <br />.oluene 10.8 ug/1 70.0-130 108 <br /> 10.0 10.1 70.0-130 101 <br /> ithylbenzene 10.0 9.91 70.0-130 99.1 <br /> Cylenes(total) 30.0 29.7 <br /> 4ethyl tert-butyl ether 70.0-130 99.0 <br />' 10.0 11.9 urrogate: a,a70.0-130 119a-Trifluorotoluene 10 0 JO./ „ <br /> 60.0-140 101 <br />�� � 5812208-01 <br /> enzene 12/17/98 10.0 ND 11.0 u /I <br /> .1g 60.0-140 110 <br /> oluene <br /> 10.0 ND 10.3 60.0-140 103 <br /> thene 10.0 ND 10.2 60.0-140 102 <br /> yle total} 30.0 ND 30.2 60.0-140 101 <br />[ethyl tent-butyl ether 10.0 ND 12.4 " <br /> rrrogate: a,a,a-7rifluorotoluene 60.0-140 124 <br /> 10.0 10.5 60.0-140 105 <br /> 5812208-01 <br /> snzene 12/17/98 10.0 ND 10.4 u /1 <br /> g 60.0-140 <br />>luene 104 25.0 5.61 <br /> 10.0 ND 9.74 600140 97.4 25.0 5.59 <br /> hylbenzene 10.0 ND 9.45 . - <br /> ilenes(total) 30.0 ND 28.5 60.0-140 94.5 25.0 7.63 ethyl tett-butyl ether 10.0 ND 11.7 60.0-140 95.0 25.0 6.1260.0-140 I17 25.0 5.81 <br /> rrogate.• a,a,a-Truorotoluene 10 0 9.63 „ <br /> 60.0-140 96.3 <br /> i <br /> joia Analytical-Sacramento <br /> *Refer to end of report for text of notes and definitions. <br /> ild W. Bobel,Client Services Repres tative <br /> Page 7 of 9 <br />