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Sequoia 819 Avenue Suite 8 <br /> 45:� Sacramento CA 95834 <br /> (916)921-9600 <br /> Analytical FAX j916)921-0 100 <br /> SECOR International Project ARCO 2133 Stockton,CA Sampled 6/22/99 <br /> 9912 Business Park Drive,Ste 100 Project Number 7G600-604-02 Received 6/22/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 718/99 <br /> Total Purgeable Hydrocarbons(C6-Cl2),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 /> LCS(conttnuedl 9070081-BSI <br /> Methyl tert-butyl ether 716/99 l0 0 11 1 ug/1 700-130 111 <br /> Surrogate a a a-Trrflucrotoluene " !0 0 105 600-140 105 <br /> Matrix Spike 9070081-MS1 5906445-09 <br /> Benzene 7/6199 100 ND 9 78 ug/I 600-140 978 <br /> Toluene 100 ND 10 2 600-140 IO2 <br /> Ethylbenzene 100 ND 108 600-140 108 <br /> Xylenes(total) 30 0 ND 29 7 600-140 990 <br /> Methyl tert-butyl ether ]0 0 ND 12 l 600-140 12I <br /> Surrogate a a a-Trifluorotoluene 10 0 9 78 600-140 978 <br /> Matrix Spike Duo 9070081-MSD1 S906445-09 <br /> Benzene 7/6/99 too ND 965 ug/I 600-140 965 25 0 134 <br /> To ne 10 0 ND 998 600-140 998 25 0 2 18 <br /> enzene 100 ND 105 600-140 105 250 2 82 <br /> X es(total) 300 ND 29 1 600-140 970 25 0 204 <br /> Methyl tert-butyl ether 10 0 ND 122 600-140 122 250 0 823 <br /> Surrogate a,a,a-Trfluorototuene 10 0 105 600-140 105 <br /> Se a Analytical-Sacramento *Refer to end of report for text of notes and definition <br /> Page 6 of 7 <br />