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Gettier-Ryan/Geostrategies(1) Project Tosco(1) <br /> 6747 Sierra Court,Suite J Project Number Tosco#15886, Stockton,CA Repot <br /> Dublin CA,94568 Project Manager Deanna Harding 05/25/01 16 59 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical- San Carlos <br /> Repomng Spnke Sotnce %REC RPD <br /> Analyte Result Lawt Units Level Rcswt %REC Lmnts RPD Limrt Notes <br /> Batch 1050041-EPA 5030B [PIT] <br /> GCS(1050041-BS2) Prepared&Analyzed 05/15/01 <br /> Methyl tort-butyl ether 503 200 ug/l Soo 101 70-130 <br /> Surrogate 1 2-Dichloroethane-d4 519 Soo 104 76-114 <br /> Surrogate Toluene-& 539 500 108 88-110 <br /> Matrix Spike(1050041-MSI) Source L105054-02 Prepared&Analyzed 05/11/01 <br /> Methyl tert-butyl ether 508 200 usA 500 826 85 1 60-140 <br /> Surrogate I 1-Dichloroethane-d4 471 500 941 76-114 <br /> Surrogate Toluene-d8 494 500 988 88-110 <br /> Matrix Spike Dup(1050041-MSDI) Source L105054-02 Prepared&Analyzed 05/11/01 <br /> Methyl tert-butyl ether 522 200 ug/l 500 826 879 60440 272 25 <br /> ate 1 2-Dichloroethane-d4 481 500 962 76-114 <br /> Surrogate Toluene-d8 480 500 960 88-110 <br /> Batch 1050043"EPA 5030B [PIT] <br /> Blank(1050043-BLK1) Prepared 05/11/01 Analyzed 05/13/01 <br /> Ethanol ND 1000 u9/1 <br /> 1,2-Dibromoedme ND 200 " <br /> 1,2-Dichloroethane ND 200 " <br /> Di-isopropyl ether ND 200 <br /> Ethyl tort-butyl ether ND 200 " <br /> Methyl tert-butyl ether ND 200 " <br /> Tert-amyl methyl ether ND 200 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1 2-Dtchloroethane-d4 414 500 848 76-114 <br /> Surrogate Toluene-d8 506 500 101 88-110 <br /> Aft <br /> lloia Analytical-Sail Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Thu analytical report must be reproduced in its entirety <br /> Page 24 of 28 <br />