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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> I!ZN <br /> (916)921-9600 <br /> FAX 00 <br /> Analytical www sequolalabs coo <br /> Gettler-Ryan-Dublin Project Unocal 0187, Stockton,CA <br /> 6747 Sierra Court,Ste J Project Number C-Sparge Test <br /> Reported <br /> Dublin CA,94568 Project Manager Paul LeCheminant 04/03/01 13 49 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit )`totes <br /> Batch 1040008- EPA 5030E(PIT) <br /> Blank(1040008-BLK1) Prepared&Analyzed 03/30/01 <br /> Purgeable Hydrocarbons ND 500 u g/l <br /> Benzene ND 0 500 " <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tert-butyl ether ND 2 50 " <br /> Surrogate a a a-Trifluorotoluene 882 100 882 60-140 <br /> LCS(1040008-BSI) Prepared&Analyzed 03/30/01 <br /> Benzene 101 0 500 ug/I 100 101 70-130 <br /> Wye101 0 500 100 101 70-130 <br /> lbenenzene 102 0 500 100 102 70-130 <br /> Xylenes(total) 312 0 500 300 104 70-130 <br /> Methyl tert-butyl ether 876 2 50 100 87 6 70-130 <br /> Surrogate a a a-Trifluorotoluene 924 100 924 60-140 <br /> Matrix Spike(1040008-MSI) Source 5103484-07 Prepared&Analyzed 03/30/01 <br /> Benzene 10 l 0 500 un,/l 100 ND 101 60-140 <br /> Toluene 10 1 0 500 100 ND 101 60-140 <br /> Ethylbenzene 10 2 0 500 100 ND 102 60-140 <br /> Xylenes(total) 31 3 0 500 300 ND 104 60-140 <br /> Methyl tert-butyl ether 957 250 100 ND 957 60-140 <br /> Surrogate a a a-Tris luorotoluene 859 100 85 9 60-140 <br /> Matrix Spike Dup(1040008-MSDI) Source S103484-07 Prepared&Analyzed 03/30/01 <br /> Benzene 940 0 500 ugll 100 ND 940 60-140 7 18 25 <br /> Toluene 951 0 500 100 ND 95 1 60-140 602 25 <br /> Ethylbenzene 953 0 500 10 0 ND 953 60-140 679 25 <br /> Xylenes(total) 29 4 0 500 300 ND 98 0 60-140 626 25 <br /> Methyl tert-butyl ether 9 61 2 50 too ND 96 1 60-140 0 417 25 <br /> Surrogate a a a-TriJluorotoluene 732 100 73 2 60-140 <br /> equota Analytical- Sacramento 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 4 of 6 <br /> --— <br />