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�' Sequoia 680 Chesapeake[Drive Redwood Gq CA 94063 (650)364 9600 FAX(650) 364 9233 <br /> !r��—�� 404 N Wiget lane Walnut Creek CA 94598 (9Z5)988 9600 FAX(925)988 9673 <br /> a <br /> 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)792 0342 <br /> SECOR International Project ARCO 2133,Stockton,CA Sampled 9110/98 <br /> 9912 Business Part. Drive,Ste 100 Project Number Contract tl 22232 03 Received 9114/98 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 9128/98 <br /> Total Purgeable Hydi ocarbons(C6-C12),BTEX and MTBE by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Datc. Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> LCS(continued) 8090234-BSI <br /> Methyl tort-butyl ether 9/22/95 too 107 ug/I 700-130 107 <br /> Surrogate aaa-Tiff ifoiotoluene 11100 9 03 600-140 903 <br /> Matrix Spike 8090234-NISI S809173-03 <br /> Benzene 9/22/98 10 0 ND 994 ug/1 600-140 994 <br /> Toluene l0 0 ND 9 24 600-140 92 4 <br /> Ethylbenzene 100 ND 9 01 600-140 90 I <br /> Xylenes(total) 300 ND 27 1 600-140 903 <br /> Methyl tert-butyl ether too 6 03 126 600-140 657 <br /> Surrogate aaa-Ti tfluototoluene 100 8 70 600-140 870 <br /> Matrix Spike D-up 8090234-MSD1 S809173-03 <br /> Benzene 9/22/98 100 ND 10 1 ug/1 600-140 10I 25 0 160 <br /> enc 100 ND 9 38 600-140 938 25 0 l 50 <br /> rlbenzene too ND 9 02 600-140 902 25 0 0111 <br /> Xylenes(total) 300 ND 273 600-140 91 0 250 0 772 <br /> Methyl test-butyl ether r 100 6 03 12 1 600-140 607 25 0 791 <br /> Surrogate aaa-Tt ifluorotohrene 100 8 76 600-140 876 <br /> Sequoia Analytical -SaMirriento *Refer 10 end of report for text of notes and definitions <br /> Page 8 of 9 <br /> �mda C Schne der, Laboratory Director <br />