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1551 Industrial Road <br /> Sequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX <br /> equoi labsc12 <br /> .vww sequmalabs com <br /> -Ryan/G eostrategies(1) Project Unocal(4) <br />[6*74Slerra Court, Suite J Project Number Former Unocal SS42859 Stockton,CA Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 09/06/01 12 14 <br /> Total Purgeable Hydrocarbons (C6-02), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %R.£C RPD <br /> Analyte Result Limit Units Level Result %R1=EC Limits RPD Limit Notes <br /> Batch 1N29002 - EPA 5030B IPITI _. <br /> Blank (31129002-BLKI) Prepared&Analyzed 08/29/01 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br />£thylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tent-butyl ether ND 2 5 " <br /> Surrogate a a a-Try%ororoluene 9 70 100 970 70-130 <br /> LCS(I H29002-BSI) Prepared&Analyzed 08/29/01 <br /> Benzene 895 050 ugA 100 895 70-130 <br /> Toluene 8 71 050 100 871 70-130 <br /> Ethylbenzene 9 09 050 100 909 70-130 <br /> Xy (total) 27 0 050 300 900 70-130 <br /> Su to a,a a-Trifluorotoluene 916 100 916 70-130 <br /> LCS(IH29002-BS2) Prepared&Analyzed 08/29/01 <br /> Purgeable Hvdrocarbons 279 50 ug/l 250 112 70-130 <br /> Surrogate a a a-Trifluorotoluene 981 11100 981 70-130 <br /> Matrix Spike(1H29002-MSI) Source MKH0469-11 Prepared&Analyzed 08/29/01 <br /> Purgeable Hydrocarbons 237 50 ugh 250 ND 94 8 60-140 <br /> Surrogate a a a-Triuorotoluene 101 100 101 70-130 <br /> I%Iatrlx Spike Dup(IH29002-MSD1) Source MKU0469-11 Prepared&Analyzed 08/29/01 _ <br /> Purgeable Hydrocarbons 243 50 ug/l 250 ND 972 60-140 250 25 <br /> Surrogate a a a-Triuorotoluene 101 100 101 70-130 <br /> AdIlk <br /> SAWa Analytical - San Carlos 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 to its entirely <br /> Page 19 of 22 <br />