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TABLE 2 CHEMICAL ANALYSIS - GROUNDWATER . Diesel Performance Stockton, California (Page 4 of 4) Sample ID Date MTBE E T E X TPHg TPHk TPHd u9/1 ug/1 ug/1 ug/I ug/I ug/1 ug/1 ug/1 MW7 12/12/01 <2 0c4i <0 5 <0 5 <0 5 <1 0 <50 <50 <50 10/25/02 <2 0141 <0 5 <0 5 <0 5 <1 0 <50 <50 <50 01/23/03 <2 0141 <05 <0 5 <0 5 <1 0 <50 <50 <50 04/07/03 <2 0141 <0 5 <0 5 <0 5 <1 0 <50 <50 <50 07/09/03 <2 O14t <0 5 <0 5 <0 5 <1 0 <50 <50 <50 10/20/03 <2 0141 <0 5 <0 5 <0 5 <1 0 <50 <50 <50 01/13/04 <2 0c4i <0 5 <0 5 <0 5 <1 0 <50 <50 <50 04/07/04 <2 0141 <0 5 <0 5 <0 5 <1 0 <50 <50 <50 CPT1 12/13/01 <2 014' <0 5 <0 5 <0 5 <1 0 <50 <50 <50 MCLS NA 130 1 0 150 700 1,750 NE NE NE NOTES ugll = Micrograms per liter = Parts per Billion (ppb) MTBE = Methyl Tertiary Butyl Ether by EPA Method 8260 or 82608 8 = Benzene by EPA Method 8020 or 8021 B T = Toluene by EPA Method 8020 or 8021 B E = Ethylbenzene by EPA Method 8020 or 8021 B X — Xyienes by EPA Method 8020 or 8021 B TPHg Total Petroleum Hydrocarbons as Gasoline by EPA Method 8015 or 80156 TPHk = Total Petroleum Hydrocarbons as Kerosene EPA Method 8015 or 80158 TPHd = Total Petroleum Hydrocarbons as Diesel by EPA Method 8015 or 8015B NE = None Established NA = Not Analyzed for that constituent < = Not Detected at or Above Stated Method Detection Limit 1 = Sample analyzed by 8260 for fuel oxygenates Including Ethanol t-Butanol, De-Isopropyl Ether Ethyl t-Butyl Ether and t-Amyl Methyl Ether These fuel oyxgenates were below method detection limits 2 = Unidentified hydrocarbon, see laboratory report 3 = Overlapping chromatogram patterns, see laboratory report 4 — Sample analyzed by 8260B for fuel oxygenates including t Butanol DI-Isopropyl Ether, Ethyl t-Butyl Ether t-Amyl Methyl Ether, 1,2-Dichloroethane and 2-Dibromoethane These fuel oyxgenates were below method detection limits S 1625771TABLESIwat-TABL DOC