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t <br /> 1551 Road <br /> Sequoia San Carlostrial 94070 <br /> Analytical `650;232 9600 <br /> FAX(650 232 9612 <br /> i <br /> www sequoralabs corn <br /> Gettler-Ryan/Geostrateizies(0 Project Tosco(1) <br /> 6747 Sierra Court, Suite J Project Number Unocal SS#08671,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 02/28/02 11 15 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2B20001 -EPA 5030B PIT <br /> Matrix Spike Dup (2B20001-IN9SD1) Source L202080-07 Prepared.-02/20/02 Analyzed 02/21/02 <br /> Benzene 19 0 0 50—ug/l 20 0—ND 95 —70-130--5-20-- <br /> Toluene <br /> 5 2D —Toluene 190 050 200 ND 95 70-130 4 20 <br /> Ethylbenzene 170 0 50 20 0 ND 85 70-130 6 20 <br /> Xylenes(total) 52 4 0 50 60 0 ND 87 70-130 7 20 <br /> Surrogate a a a-Trtfluorotoluene 31 8 300 106 20-130 <br /> Sequoia Analytical -San Carlos The iesults in this report apply to the samples analyzed in accordance with the ch <br /> of custody document This analytical report must be r eproduced m its entu ety <br /> Page 15 of 16 <br />