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Gealer-Ryan/Geostrategies(1) Project Unocal(4) <br /> 6747 Sierra Court,Suite J Project Number Former Unocal SS#0123 Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 04/04/01 I3 15 <br /> Volatile Organic 8 Ogyganated Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - San Carlos <br /> Repomng Spike Soume °Y*REC RPD <br /> Analyte Resutt limit Units Level Result %RBC Limits RPD limit Notes <br /> Batch 1030078-EPA 5030B JP/T) <br /> LCS(1030078-BS2) Prepared&Analyzed 03/23/01 <br /> Metbyl tert-butyl ether 419 200 ug/1 Soo 838 70-130 <br /> Surrogate 1,2-Dichloroethaned4 486 500 972 76-114 <br /> Surrogate Toluene-d8 S16 500 103 88-110 <br /> Matrix Spike(1030078-MSI) Source L103137-08 Prepared&Analyzed 03/22/01 <br /> Methyl tort-butyl ether 440 2 00 ug4 Soo ND 88 0 60-140 <br /> Surrogate 41-Dichloroethaned4 474 500 94 8 76-114 <br /> Surrogate Toluene-d8 485 Soo 970 88-110 <br /> Matrix Spike Du (1030078-MSDI) Source-L103137-08 Prepared&Analyzed 03/22/01 <br /> Methyl tort-butyl ether 444 200 ug/I Soo ND 888 60-140 0 905 25 <br /> Surrogate 1,2-Dichloroethane-d4 463 Soo 926 76-114 <br /> Surrogate Toluene-d8 506 500 101 88-110 <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain o <br /> 4 <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 20 of 27 <br />