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Sequoia 680 Chesar-ake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytical 819 Striker Avenue Suite B Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Secor International Project Unocal 8671,Stockton,CA Sampled 5/11/98 <br /> 9912 Business Park Drive,Ste 100 Project Number NIA Received 5111/98 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 5/13,5/27/98 <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 /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Blank(continued) 8050129-BLKI <br /> Surrogate a a a-Tr fluorotoluene 5/13198 0200 0 187 mg/kg 600-140 935 <br /> i"C"S 8050129-BSI <br /> Benzene 5/13/98 0200 0207 mg/kg 700-130 103 <br /> Toluene 0200 0 192 700-130 960 <br /> Ethylbenzene 0200 0 187 700-130 935 <br /> Xylenes(total) 0 600 0 557 700-130 928 <br /> Methyl tent-butyl ether 0200 0 192 700-130 960 <br /> Surrogate a a a-Triuorotoluene 0200 0 188 600-140 94 0 <br /> Matrix Spike 8050129-MSI X04 <br /> Benzene 5/13/98 0200 ND 0 218 mg/kg 600-140 109 <br /> Toluene 0200 ND 0205 600-140 102 <br /> hylbenzene 0200 ND 0202 600-140 101 <br /> lenes(total) 0 600 ND 0 595 600-140 992 <br /> ethyl tert-butyl ether 0200 ND 0 185 600-140 925 <br /> Surrogate a a a-Trifluorotoluene 0200 0 196 600-140 98 0 <br /> Matrix Spike Dun 8050129-MSDI S805124-04 <br /> Benzene 5/13/98 0200 ND 0 212 mg/kg 600-140 106 250 279 <br /> Toluene 0200 ND 0 199 600-140 995 250 248 <br /> Ethylbenzene 0200 ND 0 197 600-140 985 250 2 51 <br /> Xylenes(total) 0 600 ND 0 585 600-140 975 250 173 <br /> Methyl tert-butyl ether 0200 ND 0 194 600-140 970 250 475 <br /> Surrogate a a a-Trifluorotoluene 0200 0 192 600-140 960 <br /> Batch, 8050239 Date Prepared. 5/19198 EExtrgctlon Method, EPA 5030E(MeOH1 <br /> Blah 8050239-BLKI <br /> Purgeable Hydrocarbons 5/19/98 ND mg/kg 1 00 <br /> Benzene ND 000500 <br /> Toluene ND 000500 <br /> Ethylbenzene ND 000500 <br /> Xylenes(total) ND 000500 <br /> Methyl tert-butyl ether ND 00500 <br /> Surrogate a,a,a-Trifluorotoluene 0200 0200 600-140 100 <br /> D&S 8050239-BS1 <br /> Benzene 5/19/98 0200 0 188 mg/kg 700-130 940 <br /> Toluene 0200 0 175 700-130 875 <br /> Ethylbenzene 0200 0 176 700-130 880 <br /> lenes(total) 0 600 0 533 700-130 88 8 <br /> Sequoia Analytical-Sacrame to *Refer to end of report for text of notes and definitions <br /> Linda C Schneider, Laboratory Director Page 7 of 10 <br />