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i y Gettler-Ryan/Geostrategies(1) Project Unocal(4) 6747 Sierra Court,Suite J Project Number Former Unocal SS#0187 Reported Dublin CA,94568 Project Manager Deanna Harding ' 05/30/01 I3 32 Volatile Organic Oxygenated Compounds by EPA Method 8260B Sequoia Analytical - San Carlos Reporting Analyte Y Result limit Units 1Alutron _ Batch y Prepared Analyzed Method Notes U-21 (L105144-22)Water Sampled 05/15/01 19 25 Received 05/16/01 1945 Tert-butyl alcohol ND 100 ug/1 1 1050084 05/19/01 05/19/01 EPA 8260B Methyl tert-butyl ether ND 200 It, It I, " Di-isopropyl ether 263 200 It Ethyl tert-butyl ether ND 200 Tert-amyl methyl ether ND 200 " Surrogate 1,1-Dtchloroethane-d4 946% 76-114 U-22(L105144-23)Water Sampled-05/14/01 18 00 Received 05/16/0119-45 " Tert-butyl alcohol ND 100 ug/1 1 1050085 05/21/01 05/21/01 EPA 8260E Methyl tert-butyl ether ND 200 It It - "-,- .. It " Di-isopropyl ether ND 200 n It " " Ethyl tent-butyl ether ND 200 " Tert-amyl methyl ether ND 200 " -Surrogate 1,2-Dtchloroethane-d4- - -- . - 904% — -76-114- U-23 76-114 U-23(L105144-24)Water Sampled 05/14/01 18 45 Received 05116/0119-45 Tert-butyl alcohol ND 100 ugn 1 1050085 05/21/01 05/21/01 EPA 8260B -Methyl tert-butyl ether ND 200 " --'Di=Isopropyl ether - -�ND� 200"J"— Ethyl tert-butyl ether ND 200 1. " Tert=amyl methyl"ether--,--—----- -""--� — -.---2 00��"___----- Surrogate 1,2-Dtchloroethane-4`4x 924% 76-114 U-24(L105144-25)Water Sampled 05/1410116 15 Received.05/16/0119:45 Tert-butyl alcohol ND 100 ug/1 1 1050085 05/21/01 05/21/01 EPA 8260B Methyl tert-butyl ether ND 200 1. " Di-isopropyl ether ND 200 It I. " Ethyl tert-butyl ether ND 200 It _ " , Tert-amyl methyl tither ND 200 Surrogate 1,2-Dtchloroethane-d4 930% 76-114 " r Sequoia Analytical- San Carlos The results in this report apply to the samples analysed in accordance with the cha custody document Thu analytical report mast be reproduced in its entirety Page 19 of 33