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r TABLE 2 CHEMICAL ANALYSIS - GROUNDWATER Diesel Performance Stockton, California (Page 3 of 3) Sample Date MTBE B T E X TPHg TPHk TPHd ID ug/l ug/I ug/l ug/l ug/I ug/l ug/l ug/l MW6 12/12/01 <2 0141 <05 <0 5 <0 5 <1 0 <50 <50 <50 10/25/02 <2 0{41 <05 <0 5 <05 <1 0 <50 <50 <50 01/23/03 <2 0f41 <05 <05 <0 5 <1 0 <50 <50 <50 MW7 12/12/01 <2 0141 <0 5 <05 <05 <1 0 <50 <50 <50 10/25/02 <2 014y <0 5 <0 5 <0 5 <1 0 <50 <50 <50 01/23/03 <2 0'41 <05 <05 <0 5 <1 0 <50 <50 <50 CPT1 12/13/01 <2 0f41 <05 <0 5 <0 5 <1 0 <50 <50 <50 MCLS 130 1 0 150 700 1,750 NE NE NE NOTES ug/l = Micrograms per liter = Parts per Billion (ppb) MTBE — Methyl Tertiary Butyl Ether by EPA Method 8260 B = Benzene by EPA Method 8020 T = Toluene by EPA Method 8020 E = Ethylbenzene by EPA Method 8020 X = Xylenes by EPA Method 8020 TPHg — Total Petroleum Hydrocarbons as Gasoline by EPA Method 8015 TPHk — Total Petroleum Hydrocarbons as Kerosene EPA Method 8015 TPHd — Total Petroleum Hydrocarbons as Diesel by EPA Method 8015 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, Di-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 8260 for fuel oxygenates including t-Butanol, Di-Isopropyl Ether, Ethyl t-Butyl Ether, t-Amyl Methyl Ether, 1,2-Dichloroethane, and 1,2-Dibromoethane These fuel oyxgenates were below method detection limits W 1625771TABLESIwat-TABL DOC [02114/2003]