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Road <br /> Sequoia San Carlos,CA 94070a1 <br /> (650)232 9600 <br /> qW Analytical FAX(650)232-9612 <br /> www sequotalabs corn <br /> ler-Ryan/Geostrategies(]) Project Unocal(4) L208033 <br /> Sierra Court.- Suite J Project Number Former Unocal#0187 Stockton Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 08/29/02 07 10 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified, BTEXM by EPA 8021B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %R£C Limits RPD Limit Notes <br /> Basch 2H21003-EPA 5030B IP/TJ <br /> Laboratory Control Sample(2Y121003-BSI) Prepared&Analyzed 08/21/02 <br /> Benzene 104 050 ug/i 100 104 70-130 <br /> Toluene 107 0 50 10 0 107 70-130 <br /> Ethylbenzene 107 050 100 107 70-130 <br /> Xylenes(total) 31 5 050 300 105 70-130 <br /> Surrogate a a a-Tral7uorotoluene 11 7 100 117 70-130 <br /> Laboraiory Control Sample(2H210.03-BS2) Prepared&Analyzed 08/21/02 <br /> Gasoline Range Organics(C6-C10) 237 50 ug/I 250 948 70-130 <br /> Surrogate aaa-Triuorololuene 121 11 100 121 70-130 <br /> idftix Spike(2H21003-MSI) Source L208033-23 Prepared&Analyzed 08/21/02 <br /> ine Range Organics(C6-CIO) 427 50 uSA 550 ND 776 60-140 <br /> Benzene 9 04 050 660 ND 134 60-140 <br /> Toluene 39 1 050 397 ND 977 60-140 <br /> Ethylbenzene 878 050 920 ND 954 60-140 <br /> Xylenes(total) 435 0 50 461 ND 933 60-140 <br /> Surrogate a a o-Trifluorotoluene 125 100 125 70-130 <br /> Matrix Spike Dup(2H21003-MSD1) Source L208033-23 Prepared&Analyzed 08/21/02 _- y <br /> Gasoline Range Organics(C6-00) 453 50 ug/I 550 ND 824 60-140 591 25 <br /> Benzene 9 12 050 660 ND 135 60-140 0 881 25 <br /> Toluene 395 0 50 397 ND 987 60-140 1 02 25 <br /> Ethylbenzene 893 050 920 ND 97 1 60-140 1 69 25 <br /> Xylenes(total) 439 050 461 ND 942 60-140 0 915 25 <br /> Surrogate a a a-Triuorotoluene 129 100 129 70-130 <br /> Batch 2H21004- EPA 5030BJP/TJ <br /> Blank(2H21004-13LKI) Prepared& Analyzed 08/21/02 <br /> Gasoline Range Organics(C6-CIO) ND 50 ug/l <br /> Benzene ND 050 " <br /> is Analytical -San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 30 of 36 <br />