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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 (9Z5)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento.CA 95634 (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 i31vd. Project Number: 21775-237-002 Received: 9/21/98 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 10/8/98 <br /> Total Purgeable Hydrocarbons (C6-C12), 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 /> Balch: 809022R Dale Prepare-d:-9/25/98 Extraction Method; EPA 50300(111T) <br /> wank <br /> Purgeable Hydrocarbons 9125/98 ND ug/1 50.0 <br /> Benzene ND 0.500 <br /> Foluene ND 0.500 <br />-7thylbenzene ND 0.500 <br /> Kylenes(total) ND 0.500 <br /> Aethyl tert-butyl ether ND 5.00 <br /> iurrogale: a,a,a-Trifluorololuene 10.0 9.02 60-0.140 90,1 <br />..c5 N990278-BSI <br /> len 9/25198 10.0 10,6 ug/l 70.0-130 106 <br />'alt 10.0 9.78 70.0-130 97.8 <br />:thylbenzene 10.0 9.64 70.0-130 96.4 <br />,ylenes(total) 30.0 28.9 70.0-130 96.3 <br /> lethyl tert-butyl ether 10.0 9.94 70.0-130 99.4 <br /> urrogate: a,a,o-Trifluorotoluene 10.0 9.08 60.0-140 90.8 <br /> laLciX Spike 8090278-MS1 S809241-02 <br /> enzene 9/25/98 10.0 ND 10.7 ug/l 60.0-140 107 <br /> ylenes(total) 30.0 ND 29.5 60.0-140 98.3 <br /> lethyl tert-butyl ether 10.0 8.29 12.0 60.0-140 37.1 2 <br /> arrogate: a,a,a-Trifluorotoluene 10.0 8.89 60.0-140 88.9 <br /> iatrix Spike Dun - S809241-02 <br /> enzene 9/25/98 10.0 ND 10.7 ug/I 60.0-140 107 25.0 0 <br /> oluene 10.0 ND 9.97 60.0-140 99.7 25.0 0.402 <br /> thylbenzene 10.0 ND 9.70 60.0-140 97.0 25.0 1.23 <br /> ylenes(total) 30.0 ND 29.0 60.0-140 96.7 25.0 1.64 <br /> ethyl tert-butyl ether 10.0 8.29 11,6 60.0-140 33.I 25.0 11,4 2 <br /> irrogate: a.a,a-Trifluorotoluene 10.0 8.62 60.0-140 86.2 <br /> Itch: 8090287 Date Prete: 9125198 Extraction_Method: EPA 503Q,U(PtT.) <br /> I2nh 80251287-BLK1 <br /> lrgeable Hydrocarbons 9/25/98 ND ug/l 50.0 <br />:nzene ND 0.500 <br /> tluene ND 0.500 <br /> hylbenzene ND 0.500 <br />/luta!) ND " 0.500 <br /> eth butyl ether <br /> IND 5.00 <br />------------------ <br /> quoia Analytical - cramento *Refer to end of report for text of notes and definitions. <br /> inald W Bobel,Client Services Representative Page 5 of 8 <br />