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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento, C 95834 <br /> ( 6 (916)9Z2 1-9600 <br /> FAX(916)921-0100 <br /> D— <br /> Analytical www sequoialabs corn <br /> Gettler-Ryan-Rancho Cordova Project Unocal 0187, Stockt:n CA Sampled 519100 <br /> 3164 Gold Camp Dr, Ste 240 Project Number NIA Received 5111100 <br /> Rancho Cordova,CA 95670 Project Manager David Herzog Reported 5/24/00 <br /> Total Purgeable Hydrocarbons (C6-02), 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) 0050230-BLKI <br /> Surrogate a a,a-Trifluorotoluene 5118100 0200 0183 mg/kg 600-140 915 <br /> LCS 0050230-BSI <br /> Benzene 5/18/00 0200 0205 mg/kg 700-130 102 <br /> Toluene 0200 0 214 700-130 107 <br /> Ethylbenzene 0200 0 212 700-130 106 <br /> Xylenes(total) 0 600 0 595 700-130 992 <br /> Methyl tert-butyl ether 0200 0 187 700-130 935 _ <br /> Surrogate a s a-Trtfluorotoluene 0200 0 194 600-140 970 <br /> Matrix Spike 0050230-MS1 S005214-04 <br /> Benzene 5/18100 0200 ND 0 176 mg/kg 600-140 880 <br /> Toluene 0200 ND 0 184 600-140 920 <br /> 0e]benzene 0200 ND 0 185 600-140 925 <br /> nes(total) 0 600 ND 0 520 600-140 867 <br /> Methyl tert-butyl ether 0200 ND 0 157 600-140 785 <br /> Surrogate a a a-Tris luorotoluene 0200 0 187 600-140 935 <br /> Matrix Spike Dup 0050230-MSDI S005214-04 <br /> Benzene 5/18/00 0200 ND 0 180 mglkg 600-140 900 250 225 <br /> Toluene 0200 ND 0 188 600-140 940 250 2 15 <br /> Ethylbenzene 0200 ND 0 189 600-140 945 25 0 2 14 <br /> Xvlenes(total) 0 600 ND 0 533 600-140 888 25 0 239 <br /> Methyl tert-butyl ether 0200 ND 0 173 600-140 865 250 9 70 <br /> Surrogate a a,a-Trifluorotoluene 0200 0 190 600-140 95 0 <br /> • <br /> Sequoia Anal)qical- Sacramento "Refer to end of report for text of notes and definitions <br /> Page 7 of 8 <br />