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Sequoia 660 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 /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Analytical <br /> t� r <br /> EMCON-Sac Project Arco 2168,Stockton,CA <br /> 1433 N Market Blvd Sampled 5/21198 to 5/22198 <br /> Project Number 2231200 Received 5/22/98 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 6/15/98 <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 /> Bauh, B060013 Date Pupared. 6/1/99 Extraction Mcithod. EPA 5030B(PIT) <br /> BI ilk M0013-BLIKI <br /> Purgeable Hydrocarbons 6/1/98 ND ug/l 500 <br /> Benzene <br /> 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-T rtfluorololuene 10 0 893 <br /> 60 0-140 893 <br /> GCS $060013-%51 <br /> 3enzene 6/1/98 100 979 ug/1 700-130 979 <br /> Toluene 100 906 70 0-130 906 <br />'-thylbenzene 100 888 70 0-130 88 6 <br />'Cy total) 300 265 70 0-130 88 3 <br />&Ie ert-butyl ether 100 11 8 700-130 118 <br /> arrogate aaa-Tryluororoluene 100 928 60 0 140 92 8 <br />✓Iatrix Spik 8060013_MS1 S805266-01 <br /> 3enzene 6/1/98 10 0 ND 10 1 u /1 <br /> oluene �� g 600-140 101 <br /> 100 ND 925 60 0-140 92 5 <br /> thylbenzene 100 ND 9 13 600-140 91 3 <br /> ylenes(total) 300 ND 273 60 0-140 91 0 <br />/ethyl tert-butyl ether 100 ND 120 60 0-140 20 <br /> 9 <br /> urrogate a a,a-Trzfluorotoluene 100 8 62 60 0-140 81 2 <br /> 060013-MSD? S805266-01 <br /> enzene 6/1/98 100 ND 105 ug/l 600-140 105 25 0 3 88 <br /> aluene 100 ND 9 15 600-140 91 5 250 l 09 <br />[hylbenzene 100 ND 9 19 60 0-140 9I 9 25 0 0 655 <br /> ylenes(total) 300 ND 278 600-140 927 25 0 ! 85 <br /> ethyl Cert-bury!ether 100 ND t 2 7 60 0-140 127 25 0 5 67 <br /> rrrogate aaa-Tr�uoratoluene 10 0 <br /> 856 600-140 85 6 <br /> itch—8060043 Date Prepare, 6/2/98 <br /> ZIIk ExtracUgnMethn _5030[3 fP/Tl <br />�rgeable Hydrocarbons 6/3/98 ND ug/1 500 <br /> nzene 6/2/98 ND " 0 500 <br /> luene ND 0 500 <br /> hylbenzene „ <br /> elenes(total) ND 0 500 <br />!t butyl ether �U 0 500 <br /> 500 <br /> quota Analytical-Sacramento *Refer to end ofreport for text of notes and defznztaozas <br /> nald W Bobel,Client Services Re resentative Page 6 of 10 <br />