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TABLE 2 CHEMICAL ANALYSIS - GROUNDWATER . Diesel Performance Stockton, California (Page 2 of 2) Sample Date MTBE B T E X TPHg TPHk TPHd ID u9/1 ug/I u9/1 u9/1 ug/l ug/l ug/I u9/1 MW4 12/22/99 <2 0"' <0 500 <0 500 <0 500 <0 500 <50 <50 <50 04/20/00 <2 0"' <0 500 <0 500 <0 500 <0 500 <50 <50 <50 06/22/00 <2 01" <0 500 <0 500 <0 500 <0 500 <50 <50 22 0(21 09/22/00 <2 00i <0 500 <0 500 <0 500 <0 500 <50 <50 <50 12/15/00 <2 01" <0 500 <0 500 <0 500 <0 500 <50 <50 <50 03/27/01 <2 00y <0 500 <0 500 <0 500 <0 500 <50 <50 <50 06/15/01 <2 01" <0 5 <0 5 <05 <0 5 <50 <50 <50 Maximum Contaminant 13 0 1 0 150 700 1750 NE NE NE Level 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 3350 TPHd = Total Petroleum Hydrocarbons as Diesel by EPA Method 3350 NE = None Established < = 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 • W 1625771TABLESIwat-TABL DOC [10116/2001]