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B 19 Sinker Ave Ste Sequoia Sacramento Cg9563B 4� (916)921-9660 ,qWAnalytical FAX(916)921-0100 www sequoialabs corn Gettler-Ryan-Dublin _ Project Former Unocal 5098,Stockton,CA S308091 ' 6747 Sierra Court,Ste J Project Number N/A Reported Dublin CA,94568 _ Project Manager Deanna L Harding 08/20/03 16 56 Volatile Organic Compounds by EPA Method 8260E - Quality Control Sequoia Analytical - Sacramento - Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Dotes Batch 3080256- EPA 5030E [P/Tl ~ _ - Matrix Spike(3080256-MS]) - Source 5308249-02 Prepared 08/19/03 Analyzed 08/20/03 _ i Benzene 256 050 ugA 250 ND 102 60-140 Chlorobenzene 245 050 25 0 ND 98 60-140 1,1-Dtehloroethene 26 l 050 250 ND 104 60-140 Toluene 247 050 25 0 ND 99 60-140 Trichloroethene 227 050 250 077 88 60-140 Surrogate Dibromofluoromcthane 253 250 101 70-130 Surrogate 1 2-DCA-d4 258 250 103 70-130 Surrogate Toluene-d8 242 250 97 70-130 Surrogate 4-BFB 250 250 100 70-130 Matrix Spike Du (3080256-MSDl) Source S308249-02 Prepared 08/19/03 Analyzed 08/20/03 Benzene _ 246 _ - 050 ug/l W 250 ND - 98 60-140 4 25 Chlorobenzene 23 6 050 25 0 ND 94 60-140 4 25 1,1-Dichlorocthene 242 0 50 25 0 ND 97 60-140 8 25 Toluene 24 1 050 25 0 ND 96 60-140 2 25 - Trichloroethene 21 0 050 25 0 077 81 60-140 8 25 —� Surrogate DibromoJluoromethane 257 250 103 70-130 Surrogate 1,2-DCAQ4 232 —250— 101 70 130 T Surrogate Toluene-d8 250 250 10070-130 Surrogate-4-3FB - ---- -- - --2J-4-- ----- ---- "----25 0- - 102 - 70-130- - - Sequoia Analytical - Sacramento The results to this repor t apply to the samples analyzed in accordance with the chain of� custody document Unless otherwise stated results are reported on a wet weight basis ' This analytical report must be reproduced in its entirety Page 116 of 117