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Sequoia <br /> 1551 industrial Road <br /> �L San Carlos CA 94070-4111 <br /> (650) 232-9600 <br /> Analytical <br /> FAX(650) 232-9612 <br /> lame Tech Services Project Chevron(3) Sampled 5/19199 <br /> 1680 Rogers Avenue Project Number Chevron/9-6171/990519-C2 Received 5/21199 <br /> San Jose,CA 95112 Project Manager Christine Lillie Reported 6/4/99 <br /> yTotal Purgeable-Hj=drocar6ons,(C6-Ci ),,BTEK and MTBE liy DHS LUF'TJQuality,Control -- - <br /> Sequoia Analytical:.San Carlos_ <br /> Date Spike Sample QC Reporting Lirmt Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> LCS 9060013-BS1 <br /> Benzene 6/2/99 100 103 ug/1 700-130 103 <br /> Toluene 100 103 700-130 103 <br /> Ethylbenzene 100 105 700-130 105 <br /> Xylenes(total) 300 31 6 700-130 105 <br /> Surrogate a,a,a-Trifluorotoluene 100 884 700-130 88 4 <br /> Matrix Spike 9060013-MS1 L905452-02 <br /> Benzene 6/2/99 100 ND ND ug/l 600-140 NR <br /> Toluene " 100 ND ND " 600-140 NR <br /> Ethylbenzene P 100 ND ND 600-140 NR <br /> Xylenes(total) 300 ND ND 600-140 NR <br /> Surrogate a,a,a-Triuorotoluene 100 ND 700-130 NR <br /> Matnx Spike Dap 9060013-MSD1 L905452-02 <br /> Ozene 6/2/99 100 ND ND ug/1 600-140 NR 250 <br /> u <br /> thylbenzeneene100 ND ND 600-140 NR 250 0 100 ND ND 600-140 NR 250 <br /> Xylenes(total) 300 ND ND 600-140 NR 250 <br /> Surrogate aa a-Tnfluorotoluene 100 ND 700-130 NR <br /> uoia Analytical- San Carlos *Refer to end of report for text of notes and definitions <br /> Page 11 of 13 <br />