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r} V <br /> 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 364-9233 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(92 5)988-9673 <br /> 1W Analytical 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792 1865 FAX(707)79Z-0342 <br /> 0 <br /> EMCON-Sac Project ARCO 2130,Stockton CA <br /> 1433 N Market Blvd Sampled 12/2198 <br /> Project Number 21775-229 003 Received 12/3/98 <br /> Sacramento,CA 95834 Protect Manager Dave Foley Reported 12/17/98 <br /> Total Purgeable Hydrocarbons(C6-C12), BTEX and MTBE by DHS LUFT1Quality 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 /> LICS(c9til mued) 8120127=$S1 <br /> Methyl tert-butyl ether 12/8/98 100 11 8 ug/l 700-130 I €8 <br /> Surrogate a a a-Tri luorololuene 10 0 984 6D 0 140 98 4 <br /> Matrix. pikg 120127;mS1 5812074-01 <br /> Benzene 1218198 10 0 ND 10 5 u /1 <br /> Toluene „ 8 60 0-140 105 <br /> 10 0 ND 9 84 600-140 98 4 <br /> Ethylbenzene 10 0 ND 957 600-140 957 <br /> Xylenes(total) 30 0 ND 28 7 60 0-140 95 7 <br /> Methyl tert-butyl ether 10 0 ND 1 1 8 60 0-140 918 <br /> Surrogate aaa-Trrfluarotoluene 10 0 9 81 600-140 98 1 <br /> Mat ILSPtke Duo 8120127_MSDI SE12 74-01 <br /> Benzene 12!8/98 10 0 ND 10 8 ug/l 600-140 I08 25 0 2 82 <br /> Toluene 100 ND 10 1 600-140 101 25 0 2 61 <br /> enz100 ND 977 60 0-140 97 7 25 0 2 07 <br /> es(total) 300 ND 29 5 600-140 98 3 250 2 68 <br /> Methyl tent butyl ether t0 0 ND 123 600-140 123 250 4 15 <br /> Surrogate a a a-Trni luorotoluene 100 10 2 600-140 102 <br /> Se a Analytical-Sacramento <br /> Refer to end of i epori for text ofrrotes and definitions <br /> Ronald W Sobel,Client Services Representatne <br /> Page 8 of 10 <br />