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Sequoia <br /> Che-peake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> J qu0 a 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)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 707 791-1865 FAX 707 792-0342 <br /> SECOR International Project ARCO 2093,Tracy,CA Sampled 2/2199 <br /> 9912 Business Park Drive,Ste 100 Project Number N/A Received 2/3199 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 2/17/99 <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 RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes' <br /> Batch. 9020043 Date Prepared. 2/3/99 Extraction Method. EPA 5030B(P/T) <br /> Blailk 9020043-BLK 1 <br /> Purgeable Hydrocarbons 2/3/99 NO mg/m'Air 100 <br /> Benzene NO 00500 <br /> Toluene NO 00500 <br /> Ethylbenzene ND 00500 <br /> Xylenes(total) NO 00500 <br /> Methyl tert-butyl ether NO 0 500 <br /> Surrogate a a a-Trifluorotaluene 1 00 2 16 600-140 108 <br /> LCC 9020043-BS <br /> Benzene 2/3/99 200 2 05 mg/m'Air 700-130 102 <br /> Toluene 200 202 700-130 101 <br /> Ethylbenzene 2 00 l 97 700-130 98 5 <br /> lenes(total) 6 00 5 96 �()- <br /> 0 99 3 <br /> hyl tert-butyl ether 2 00 2 39 0 120 <br /> Surrogate a a a Tr1; orotoluene 2 00 1 95 60 0-140 97 5 <br /> LSD iip 9020043-BSD 1 <br /> Benzene 2/3/99 200 206 mg/m'Air 700-130 103 250 0 976 <br /> Toluene 200 2 02 700-130 101 25 0 0 <br /> Ethylbenzene 200 1 99 700-130 995 25 0 1 01 <br /> Xylenes(total) 600 6 04 700-130 101 25 0 1 70 <br /> Methyl tert-butyl ether 200 2 33 700-130 116 250 3 39 <br /> Surrogate a a a-Tri luorotoluene 200 1 94 600-140 970 <br /> llqqLota Analytical -Sacramento 'Refer to end of report for text of notes and definitions <br /> r <br /> ands R ancon,Client Services Representative Page 4 of 6 <br />