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Sequoia 819 Striker Avenue,Suite 8 <br /> i Sacramento CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> 1CON/IT-Sacramento Project ARCO 2130,Stockton,CA Sampled 11/29/99 <br /> 1433 N Market Blvd,#I Protect Number 792223 Received 11/30/99 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 12/14/99 <br /> Total Purgeahle Hydrocarbons (C&02),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(continued) 9120061-BLK1 <br /> Surrogate a a a-Trifluorotoluene 11/6199 100 978 119/1 600-140 978 <br /> LCS 9120061-BSI <br /> Benzene 12/6/99 loo 915 ug/l 700-130 915 <br /> Toluene 100 949 700-130 949 <br /> Ethylbenzene 100 936 700-130 93 6 <br /> Xylenes(total) " 300 282 700-130 940 <br /> _Methyl tert-butyl ether 100 958 700-130 958 <br /> Surrogate a,a a-Trifluorotoluene 100 977 600-140 977 <br /> Matrix Spike 9120061-MSI 5912025-01 <br /> Benzene 12/6199 100 ND 9 11 ug/l 600-140 91 1 <br /> Toluene 100 ND 948 600-140 948 <br /> Ethylbenzene 100 ND 931 600-140 931 <br /> �X lenes(total) 300 ND 28 2 600-140 940 <br /> yl tert-butyl ether 100 ND 878 600-140 878 <br /> ogate a,a,a-Tris luorotoluene 100 962 600-140 962 <br /> Matrix S ike Du 9120061-MSDI S912025-01 <br /> Benzene 12/6/99 100 ND 930 ug/l 600-140 93 0 250 206 <br /> Toluene 100 ND 966 600-140 966 25 0 188 <br /> Ethylbenzene too ND 958 600-140 958 250 2 86 <br /> Xylenes(total) 300 ND 28 8 600-140 960 25 0 211 <br /> Methyl tert-butyl ether Too ND 924 600-140 924 250 511 <br /> Surrogate a a,a-Trii luorotoluene 100 960 600-140 960 <br /> is Analytical-Sacramento 'Refer to end ofreportfor text ofnotes and definitions <br /> Page 7 of 9 <br />