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680 Chesapeake Drive Redwood City,CA 94063 (6501364-9600 FAX(650)364-9233 <br /> Sequoia 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(92S)998-9673 <br /> 1 819 Striker Avenue,Suite 8 Sacramento.CA 95834 (q 16)92 1-9600 FAX(9((5)9Z1-OIpO <br /> Analytical 1455 McDowell Blvd.NDrth,Ste.D Petaluma,CA 94954 (707) 792.1865 FAX(767)792-0342 <br /> 1551 Industrial Road San Carlos,CA 94070-4?1 1 (650) 232.9600 FAX(650) Z32-9612 <br /> EMCON - Sac Project: ARCO 2186, Stockton,CA Sampled: 3/31/99 <br /> 1433 N. Market Blvd. Project Number: 21775-23 7-004 Received: 4/1/99 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 4/15/99 <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. RPI] RPD <br /> Analyte Analyzed Level Result Result [Snits Recov_ Limits % Limit % Notes* <br /> Batch; 9040133 Date Vrenared: 4112199 Extraction Method: EPA 5030B(PIT) <br /> Erik 9040133-BLK 1 <br /> Purgeable Hydrocarbons 41i2/99 ND ug/l 50.0 <br /> Benzene NO 0.500 <br />"Toluene ND 0.500 <br /> Ethylbenzene ND 0.500 <br /> Xylenes(total) ND O.SOO <br /> Methyl tort-butyl ether ND 5.00 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.76 60.0-140 97.6 <br /> 1� 9030133-BSl <br /> Benzene 4/12/99 10.0 8.87 ug/1 70.0-130 88.7 <br /> Toluene 10.0 9,06 70.0-130 90.6 <br /> Ethylbenzene 10.0 8.89 70.0-130 88.9 <br /> Xy (total) 30.0 27.1 70.0-130 90.3 <br /> Me ert-butyl ether 10.0 10.3 70.0-130 103 <br /> Surrogate: a,a,a-Triuorotoluene 10.0 8.36 60.0-140 83.6 <br /> Matzix_SRik9040133-MSI 0,20402S-03 <br /> Benzene 4112/99 10.0 NTS 9.93 u811 60.0-140 99.3 <br /> Toluene 10.0 ND 10.0 60.0-140 100 <br /> Ethylbenzene 10,0 ND 990 60.0-140 99.0 <br /> Xylenes(total) " 30.0 ND 29.9 60.0-140 99.7 <br /> ylethyl Cert-butyl ether 10.0 ND 11.1 60.0-140 111' <br /> surrogate: a,a,a-Trifluorotoluene 10.0 9.72 60.0-140 97.2 <br /> Matrix Spike un 904U133-MS)t S904028-03 <br /> 3enzene 4112199 10.0 ND 10.1 ugll 60,0-140 101 25.0 1.70 <br /> 'oluene 10.0 ND 10.1 60.0-140 101 25.0 0.995 <br /> thylbenzene 10.0 ND 10.1 60.0-140 101 25.0 2-OO <br /> ylenes(to(al) 30.0 ND 30.4 60.0-140 101 25.0 1.30 <br /> (ethyl tent-butyl ether 10.0 ND 11.1 60.0-140 111 25.0 0 <br /> lrrogate: a,a,a-Trifluorotoluene 10.0 9.75 60.0-140 97.5 <br /> iuoia Analytical - Sacramento *Refer to end of report for text of(totes and definitions. <br /> G I ,/ <br /> iald W. Bobel,Chem Services Representative Page 6 of 8 <br />