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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988 9600 FAX(9Z5)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 <br /> 1455 McDoweli Blvd North Ste D Petaluma,CA 94954 (707) 792 1865 FAX(707) 792 0342 <br /> LMCON- Sac Project ARCO 2168 Stockton,CA Sampled 8/12/98 <br /> 1433 N Market Blvd Project Number 2231200 Received 8/13/98 <br /> Sacramento CA 95834 Project Manager Dave Foley Reported 8/31/98 <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 /> knalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br />,CS(continued) $030209113SI <br /> Methyl tert-butyl ether 8/19/98 100 11 7 ug/1 700-130 117 <br /> uri ogale aaa-Triuorwoluene l o o 102 600-140 102 <br /> Matrix21rix 5otke $4$ML-Ma S808170-04 <br /> lenzene 8/19/98 100 ND 9 04 ug/I 600-140 904 <br /> oluene 100 ND 8 75 600-140 875 <br /> thylbenzene 10 0 ND 842 600-140 84 2 <br /> ylenes(total) 300 ND 25 6 600-140 85 3 <br /> lethyl tert-butyl ether 100 5 13 143 600-140 91 7 <br /> urragate a a a-Trifluorotoluene 10 0 8 95 600-140 89 S <br /> $4$0209-MSIII S80NI70-04 <br /> enz 8/19/98 100 ND 962 ug/I 600-140 96 2 25 0 622 <br />�1 100 ND 9 55 600-140 9S5 25 0 874 <br /> by zene 1010 ND 9 14 600-140 9I 4 250 8 20 <br /> ylenes(total) 300 ND 27 5 600-140 91 7 25 0 723 <br /> ethyl tert-butyl ether 100 5 13 13 9 600-140 877 25 0 446 <br /> Trogate a a a-TrIuorololuene 10 0 933 600-140 93 3 <br /> i <br /> uoia Analytical-Sacramento *Refer to end of report for text of holes and definitions <br /> iald W Bobel,Client Services Repre entative Page 8 of 10 <br />