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819 Stnker Avenue Suite 8 <br /> Sequoia Saaamento CA 95834 <br /> (916)921-9600 <br /> FAX 00 <br /> Analytical www sequoialabs com <br /> Gettler-Ryan-Dublin Project Unocal 0187 Stockton,CA <br /> 6747 Sierra Court, Ste J Project Number C-Sparge Test Reported <br /> Dublin CA,94568 Project Manager Paul LeCheminant 04/16/01 11 55 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Repo"ing Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limns RPD Limit Notes <br /> Batch 1040173-EPA 5030B(P/T) <br /> Blank(1040173-BLK1) Prepared&Analyzed 04/12/01 <br /> Purgeable Hydrocarbons ND 500 ug/1 <br /> Benzene ND 0 500 " <br /> Toluene ND 0 500 " <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 " <br /> Methyl ten-butyl ether ND 250 " <br /> Surrogate a a a-Trti luorotoluene 940 100 940 60-140 <br /> LCS(1040173-BSI) Prepared&Analyzed 04/12/01 <br /> Benzene 952 0 500 ug/t 100 952 70-130 <br /> enr 968 0 500 100 968 70-130 <br /> ,ylbe.zcnc 980 0 500 100 980 70-130 <br /> Xylenes(total) 300 0 500 300 100 70-130 <br /> Methyl tent-butyl ether 8 14 250 100 81 4 70-130 <br /> Surrogate a a a-Trti luorotoluene 980 100 98 0 60-140 <br /> Matrix Spike(1040173-MSI) Source S104130-05 Prepared&Analyzed 04/12/01 <br /> Benzene 909 0 500 ug/t 100 ND 909 60-140 <br /> Toluene 921 0 500 100 ND 921 60-140 <br /> Ethylbenzene 938 0 500 100 ND 93 8 60-140 <br /> Xylenes(total) 288 0 500 300 ND 960 60-140 <br /> Methyl tert-butyl ether 925 250 100 ND 925 60-140 <br /> Surrogate a a a-Tri luorololuene 106 100 106 60-140 <br /> Matrix Spike Dup(1040173-MSD1) Source 5104130-05 Prepared&Analyzed 04/12/01 <br /> Benzene 930 0 500 ug/l 10 0 ND 930 60-140 228 25 <br /> Toluene 947 0 500 100 ND 947 60-140 2 78 25 <br /> Ethylbenzene 961 0 500 100 ND 96 1 60-140 242 25 <br /> Xylenes(total) 294 0 500 300 ND 980 60-140 206 25 <br /> Methyl tert-butyl ether 9 0 t 250 100 ND 90 1 60-140 2 63 25 <br /> Surrogate aaa-Trifluorotoluene 10 6 100 106 60-140 <br /> equoia 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 5 of 6 <br />