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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento C2 95834 <br /> (916)921-960096M <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs corn <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 06/25/01 14 29 <br /> Total Purgcablc 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 Notes <br /> Batch 1060191 - EPA 5030B(PIT) <br /> Blank(1060191-BLKI) Prepared&Analyzed 06/19/01 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 050 <br /> Methyl tent-butyl ether ND 2 5 " <br /> Surrogate a a a-Treuorotoluene 114 100 114 60-140 <br /> LCS(1060191-BS1) Prepared&Analyzed 06/19/01 <br /> Benzene 836 050 ug/l 100 83 6 70-130 <br /> ene 925 0 50 100 925 70-130 <br /> ibenzene 949 050 100 949 70-130 <br /> Xylenes(total) 267 050 300 890 70-130 <br /> Methyl tert-butyl ether 8 17 2 5 100 817 70-130 <br /> Surrogate a a a-Tr fluorotoluene 121 100 121 60-140 <br /> Matrix Spike(1060191-MS1) Source 5106204-08 Prepared&Analyzed 06/19/01 <br /> Benzene 7 58 0 50 ug/l 10 0 ND 758 60-140 <br /> Toluene 857 0 50 10 0 ND 85 7 60-140 <br /> Ethylbenzene 903 050 10 0 ND 903 60-140 <br /> Xylenes(total) 256 050 300 ND 853 60-140 <br /> Methyl tett-butyl ether 12 7 2 5 WO 3 7 900 60-140 <br /> Surrogate a a a-TriJluorotoluene 107 100 107 60-140 <br /> Matrix Spike Dup(1060191-MSD1) Source 5106204-08 Prepared&Analyzed 06/19/01 <br /> Benzene 858 050 ug/l 100 ND 85 8 60-140 124 25 <br /> Toluene 943 050 100 ND 943 60-140 956 25 <br /> Ethylbenzene 9 94 0 50 100 ND 994 60-140 9 59 25 <br /> Xylenes(total) 279 0 50 300 ND 930 60-140 860 25 <br /> Methyl tert-butyl ether 119 25 100 3 7 820 60-140 6 50 25 <br /> Surrogate a a a-Triuorotoluene 118 100 118 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 />