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'y 1!) <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> EMCON-Sac Project Arco 548,Stockton,CA Sampled 6/23/98 <br /> 1433 N Market Blvd Project Number 21775-206 003 Received 6/24/98 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 7/11/98 <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 /> Blank(conttaugji) 8070056-131AI <br /> Surrogate a a a-Tri luorotoluene 7/6/98 100 988 1.19/1 600-140 988 <br /> LICS 8070056-BSI <br /> Benzene 7/6/98 100 103 ug/l 700-130 103 <br /> Toluene 100 100 700-130 100 <br /> Ethylbenzene 100 100 700-130 100 <br /> Xylenes(total) 300 298 700-130 993 <br /> Methyl tert-butyl ether 10 0 102 700-130 102 <br /> Surrogate a a a-Trifluorotoluene 100 994 600-140 994 <br /> Matrix Spike 8070056-Mcs1 S806330-01 <br /> Benzene 7/6/98 100 ND 969 ug/I 600-140 969 <br /> Toluene 10 0 ND 932 600-140 932 <br /> Ethylbenzene 10 0 ND 9 26 60 0-140 92 6 <br /> Matrix Spike Dup <br /> nes(total) 30 0 ND 27 7 60 0-140 92 3 <br /> y]tert-butyl ether 10 0 ND 12 6 " 60 0-140 126 <br /> Surrogate a,a,a-TriJluorotoluene !0 0 9 62 60 0-140 96 2 <br /> 8070056-MSD1 $806330-01 <br /> Benzene 7/6/98 100 ND 8 96 ug/l 600-140 896 25 0 783 <br /> Toluene 100 ND 8 93 600-140 893 25 0 427 <br /> Ethylbenzene 100 ND 8 93 600-140 893 25 0 363 <br /> Xylenes(total) 300 ND 262 600-140 873 25 0 557 <br /> Methyl tent-butyl ether 100 ND 7 57 600-140 757 25 0 499 2 <br /> Surrogate aaa-Trifluorotoluene 100 890 600-140 890 <br /> Qoia Analytical-Sacramento ' *Refer to end of report for test of notes and definitions <br /> � J <br /> Ronald W Bobel,Client Services Representative Page 5 of 6 <br /> ,Q� <br />