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'y 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(925)988-9673 <br /> �,I,,�► <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento.CA 95834 (9f6)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: 12/14/98 <br /> 1433 N. Market Blvd. Project Number: 21775-237-003 Received: 12/15/98 <br /> Sacramento, CA 95834 Project Manager: Dave Foley Reported: 12/31/98 <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 Leve[ Result Result Units Recov. Limits % Limit % Notes <br /> Batch: 812,024¢ DattIrepared-12/17/98 Extraction Method, EPA 5030B(P/1) <br /> Mank 8120246-BLKI <br /> Purgeable Hydrocarbons 12/17/98 IND ug/I 50.0 <br /> Benzene ND 0.500 <br /> Toluene ND 0.500 <br /> Ethylbenzene ND 0.500 <br /> Xylenes(total) ND 0.500 <br /> Methyl tert-butyl ether ND 5.00 <br /> Surrogate: a,a,a-Tri luorotoluene 10.0 10.5 <br /> 60.0-140 105 <br /> LSE 8120246-BSI <br /> Benzene 12/17/98 10.0 11.1 ug/I 70.0-130 111 <br /> Toluene 10.0 10.3 70.0-130 103 <br />-thylbenzene 10.0 10.2 70.0-130 102 <br /> Ky (total) 30.0 30.4 70.0-130 101 <br /> ylet, ert-butyl ether 10.0 11.1 70.0-130 111 <br /> surrogate: a,a,a-Triuorotoluene 10.0 10.5 60.0-140 105 <br /> dalrix Spike 8120246-MS 5812222-03 <br /> 3enzene 12/17/98 10.0 ND 10.9 ug/I 60.0-140 109 <br /> f oluene 10.0 ND 10.4 60.0-140 104 <br /> ithylbenzene 10.0 ND 10.2 60.0-140 102 <br /> Cylenes(total) 30.0 ND 30.4 60.0-140 101 <br /> 4ethyl cert-butyl ether 10.0 ND 10.6 60.0-140 106 <br /> urrogate: a,a,a-Trifluorotoluene 10.0 9.85 60.0-140 98.5 <br /> 4atrix Spike Duly 8120246-M,Sf)l S812222-03 <br /> lenzene 12/17/98 10.0 ND 11.1 ug/1 60.0-140 111 25.0 1.82 <br /> oluene 10.0 ND 10.4 60.0-140 104 25.0 0 <br /> thylbenzene 10.0 ND 10.1 60.0-140 101 25.0 0.985 <br /> xylenes(total) 30.0 ND 30.5 60.0-140 102 25.0 0.985 <br /> lethyl tert-butyl ether 10.0 ND 14,2 60.0-140 I42 25.0 29.0 3,4 <br /> urrogate: a,a,a-Trlfluorololuene 10.0 10.1 60.0-140 101 <br /> atch: 8120266 Rate Prepared, 12/17/98 <br /> I;1,11k $1292� Exllaction Method: FPA 590��) <br /> .LK1 03 <br />-irgeable Hydrocarbons 12/17/98 ND ug/l 50.0 <br /> enzene ND 0.500 <br /> atuene ND 0.500 <br />:hylbenzene ND 0.500 <br /> ylenes(total) IND „ <br /> ,500 <br /> et butyl ether ND 05.00 <br />:quoia Analytical -Sacramento *Refer to end of report for text of notes and definitions. <br /> mald W. Bobel,Client Services Represent Ave Page 6 of 9 <br /> rz-, <br />