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47 Sequoia Walnut Creek CA 945988 <br /> (925)988-%W <br /> Analytical www <br /> (925) 73 <br /> www sequoialabs alabs corn <br /> Wer Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosco SS# 5886 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 26-Feb-01 07 38 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> =Analyte Result Linut Units Level Result %REC Lumts RPD Lumt Notes <br /> Batch 1B21003-EPA 5030B [PIT] <br /> Blank(1B21003-BLKI) Prepared&Analyzed 2l-Feb-OI <br /> Purgeable llydrocarbans ND 500 ug/l <br /> Benzene ND 0 500 " <br /> Toluene ND 0 500 " <br /> Ethytbenzene ND 0 500 " <br /> Xylenes(total) ND 0 500 " <br /> Methyl telt-butyl ether ND 250 " <br /> Surrogate q q a Tnfluorotoluene 10 2 <br /> 100 102 70-130 <br /> LCS(1B21003-BSI) Prepared&Analyzed 21-Feb-01 <br /> Benzene 740 0 500 ug/l to 0 740 70-130 <br /> Toluene 9 16 0 500 100 91 6 70-130 <br /> Ethylbenzene 105 0 500 100 105 70-130 <br /> �s(total) 31 2 0 500 300 104 70-130 <br /> ate a q a Tnfluorotoluene <br /> 936 100 936 70-130 <br /> Matrix Spike(1B21003-MSI) Source NH B0476-08 Prepared&Analyzed 21-Feb-01 <br /> Benzene 769 0 500 ug/l 10 0 1 05 663 60-140 <br /> Toluene 955 0 500 too 107 84 8 60-140 <br /> Ethylbenzene 108 0 500 100 ND 108 60-140 <br /> Xylenes(total) 325 0 500 300 ND 107 60-140 <br /> Surrogate q a a-T rifluorotoluene 968 100 968 70-130 <br /> Matrix Spike Dup (1B21003-MSD1) Source NU B0476-08 Prepared&Analyzed 21-Feb-OI <br /> Benzene 860 0 500 ug/l too 105 75 5 60-140 113 25 <br /> Toluene 105 0 500 too 107 943 60-140 9 48 25 <br /> Ethylbenzene 1 I 5 0 500 100 ND 1 l5 60-140 629 25 <br /> Xylenes(total) 349 0 500 300 ND 115 60-140 712 25 <br /> Surrogate q a a-Tnfluorotoluene 104 100 104 70-130 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> 0 custody document This analytical report must be reproduced m its entirely <br /> Page 9 of 10 <br />