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404 N Wlget Lane <br /> Walnut Creek,reek, -9600 <br /> 94598 <br /> (925)98 988-9fi0p <br /> FAX(925)988-9673 <br /> Analytical www sequolala65 1:0% <br /> Gettler Ryan,Inc -Dublin Project Unocal <br /> 6747 Sierra Court Suite J Project Number Unocal#0123 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 07-Apr-00 15 41 <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 /> Analyte Result Linit Units Level Result a/aREC Lmuts RPD Limit Notes <br /> Batch OC28001 -EPA 5030B [PM <br /> Blank(OC28001-BLK1) Prepared&Analyzed 28-Mar-00 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 25 " <br /> Surrogate a;a,a-Tn,Jluorotoluene 314 300 105 70-130 <br /> LCS(OC28001-BSI) Prepared&Analyzed 28-Mar-00 <br /> Benzene 179 0 50 u9/1 200 895 70-130 <br /> Tohwne 184 0 50 200 92 0 70-130 . <br /> Ethylbenzons 193 0 50 200 965 70.130 <br /> Xylenes(total) 602 0 50 600 100 70-130 <br /> Surrogate ga;a-Tnfluorotoluene 276 300 920 70-130 <br /> a <br /> Matra Spike(OC28001-MSI) Source W003457-04 Prepared&Analyzed 28-Mar-00 <br /> —Bee 17 8 0 50�ug/l 20 0 ND 89 070-130 <br /> —Toluene 170-050 20 0 ND 85 070-130 <br /> =Ethylbenzena 18 1 0 50 --20 0 ND 90 5=70-130 <br /> Xylones(total) 399 0 50 600 ND 998 70.130 <br /> Surrogate em a-Tn luorotoluene 269 300 897 µ 70-130 <br /> Matnx Spike Dup(OC28001-MSD1) Source W003457-04 Prepared&Analyzed 28-Mar-00 <br /> Benzene 175 050 ugfi 200 ND 875 70-130 170 20 <br /> Toluene 182 050 200 ND 910 70-130 682 20 <br /> Mylbenzene 213 0 50 200 ND 106 70-130 162 20 <br /> Xylenes(total) 599 0 50 600 ND 99 8 70-130 0 20 <br /> Surrogate a;a;a-Tn luorotoluene 268 300 893 70-130 <br /> Sequoia Analytical-Walnut Creek The results in tits report apply to the samples analyzed in accordance with the chem of <br /> custody document Tim analytical report must be reproduced In its entirety <br /> Page 12 of 18 <br />