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. T 4 • SUMMARY OF VAPOR EXTRA SYSTEM ANALYTICAL DATA Farmer Property,610 Hunter Street,Stockton,CA Page 7 of 7 reported in parts per million y vo ume my Sample ID Date TPHg Benzene Toluene Ethyl Xylenes MTBE ETRE I TBA DIPE TAME Benzene VW4 02/23/04 NS NS NS NS NS NS NS NS NS NS 03126/04 16 0 95 0 31 0 35 221 <0100 <0100 <0 250 <0100 <0100 04/26/04 18 0 98 1 3 065 447 <0100 <0100 <0 250 <0100 <0100 05/26/04 SYSTEM DOWN 06/28/04 76 4 157 1 12 1 11 309 <0 050 <0 050 <0 050 <0 050 <0 050 07/26/04 <20 <0 050 <0 050 <0 050 <0100 <0 050 <0 050 <0 050 <0 050 <0 050 08/26/04 2 8 <0 050 <0 050 <0 050 014 <0 050 <0 050 <0 050 <0 050 <0 050 09/27104 170 <0 050 <0 050 011 0 279 <0 050 <0 050 <0 050 <0 050 <0 050 11/05/04 SYSTEM DOWN 03101105' SYSTEM DOWN M W 1 02123/04 360 28 1 5 5 3 238 <01 <01 <0 25 <01 <01 03/26104 120 2 8 22 7 0 397 <0 i <0 1 <0 25 <0 1 <0 1 04126/04 28 023 019 <0 50 103 <01 <01 <0 25 <01 <01 05/26104 SYSTEM DOWN 06128/04 889 <0 050 016 172 512 <0 050 <0 050 <0 050 <0 050 <0 050 07!26/04 315 <0 050 <0 050 <0 050 <0100 <0 050 <0 050 <0 050 <0 050 <0 050 08121 6/04 23 0 <0 050 <0 050 012 0 584 <0 050 <0 050 <0 050 <0 050 <0 050 09/27/04 8 4 <0 050 <0 050 <0 050 <0100 <0 050 <0 050 <0 050 <0 050 <0 050 11/05104 SYSTEM DOWN 03/01105' SYSTEM DOWN Notes <denotes not detected at or above Stated Method Detection Limit TPHg denotes Total Petroleum Hydrocarbons as gasoline,analyzed by EPA Method 5030/8015 MTBE denotes methyl tertiary butyl ether by EPA Method 8260 ETBE denotes ethyl tertiary butyl ether by EPA Method 8260 TBA denotes tertiary butyl ether by EPA Method 8260 DIPE denotes di-isopropyl ether by EPA Method 8260 TAME denotes tertiary amyl methyl ether by EPA Method 8260 ppm denotes parts per million NM denotes not monitored NA denotes not applicable NS denotes not sampled Vapor wells VW3 was taken off line and VW4 is partially closed 118103 denotes system was not operated during the first quarter 2005 I