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404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> Analytical FAX equo slabs c 73 <br /> www sequoiatabs cvm <br /> Gettler Ryan Inc -Dublin Project Unocal <br /> 6747 Sierra Court Suite J Project Number Unocal#2859 Reported. <br /> Dublin CA 94568 Project Manager Scott Polston 10-Jul-01 11 15 <br /> Total Purgeable Hydrocarbons (C&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 1 F22003- EPA 5030B PIT <br /> Blank(IF22003-BLKI) Prepared&Analyzed 22-Jun-01 <br /> Purgeable Hydrocarbons ND 10 mg/m'Air <br /> Benzene ND 010 <br /> Toluene ND 010 <br /> Ethylbenzene ND 010 <br /> Xylenes(total) ND 0 10 " <br /> Methyl tent-butyl ether ND 0 50 <br /> Surrogate a a a-Trifluorotoluene 548 - 600 913 70-130 <br /> Blank(1 F22003-BLK2) Prepared&Analyzed 25-Jun-01 <br /> mrgeable Hydrocarbons ND 10 mg/ml Air <br /> une ND 010 " <br /> Toluene ND 010 " <br /> Ethylbenzene ND 010 " <br /> Xylenes(total) ND 0 10 <br /> Methyl tert-butyl ether ND 0 50 <br /> Surrogate a a a-Trifluorotoluene 594 600 990 '0-130 <br /> LCS(1F22003-BSI) Prepared 22-jun-Ol Analyzed 27-Jun-01 <br /> Benzene _ 2 18 0 10 mg/ml Air 200 109 70-130 <br /> Toluene 220 0 10 200 110 70-130 <br /> Ethylbenzene 2 22 0 10 200 111 70-130 <br /> Xylenes(total) 694 0 10 600 116 70-130 <br /> Surrogate a a a-Trifluorotoluene 338 600 897 70-130 <br /> LCS(IF22003-BS2) Prepared&Analyzed 25-Jun-01 <br /> Benzene 448 0 10 mg/ml Air 400 112 70-130 <br /> Toluene 360 0 10 400 900 70-130 <br /> Ethylbenzene 358 0 10 400 895 70-130 <br /> Xylenes(total) 113 0 10 12 0 942 70-130 <br /> Surrogate a a a-Trifluorotoluene 592 600 98 7 70-130 <br /> 0 <br /> Sequoia Analytical- Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 5 of 7 <br />