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404 N Wiget Lane <br /> Sequoia Walnut Zk't�4 <br /> 4 FAX(925)988-967; <br /> d Nr Analytical www sequolalabs cors, <br /> er Ryan,Inc -Dublin Project Unocal <br /> 6 747 Sierra Court Suite J Project Number Unocal# 1205 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 08-Feb-01 07 55 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> JAnalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1A19002-EPA 5030B[PIT] <br /> Blank(IAI9002-BLKI) Prepared&Analyzed 19-Jan-01 <br /> Purgeable Hydrocarbons ND 50 ugn <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert butyl ether ND 25 " <br /> Surrogate qqa-Tnfluoroioluene 312 " 300 104 70-130 <br /> LCS(1A19002-BS1) Prepared&Analyzed 19-Jan-01 <br /> Benzene 171 050 ug/l 200 955 70-130 <br /> Toluene 172 050 200 960 70-130 <br /> Ethylbenzene 171 050 200 855 70-130 <br /> es(total) 511 050 600 852 70-130 <br /> gate q Q a-Pzr orowluene 269 30 0 897 70-130 <br /> Matrix Spike(1A19002-MSI) Source W101I83-09 Prepared&Analyzed I9-Jan-01 <br /> Benzene 190 050 ug/l 200 ND 950 70-130 <br /> Toluene 202 050 " 200 12 950 70-130 <br /> Ethylbenzena 199 0 50 200 095 947 70-130 <br /> Xylenes(total) 610 050 600 46 940 70-130 <br /> Surrogate a o;a-PtOorotoluene 300 300 100 70-130 <br /> Matrix Spike Dup(IAI9002-MSD 1) Source W101183-09 Prepared&Analyzed 19-Jan-01 <br /> Benzene 201 050 u8A 200 ND 101 70-130 563 20 <br /> Toluene 215 050 " 200 12 101 70-130 624 20 <br /> Ethylbenzene 211 050 200 095 101 70-130 5 85 20 <br /> Xylenes(total) 629 050 600 46 972 70-130 307 20 <br /> Surrogate a 4 aa?rrfluorotoluene 330 300 110 70-130 <br /> S is Analytwal-Walnut Creek Thre results in this report apply to the samples analyzed in accardmwe with the chain of <br /> custody document Thus analytical report ma be reproduced in its enppq, <br /> ti <br /> Page 10 of 14 <br />