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TABLE KEY STANDARD ABREVIATIONS -- — not analyzed,measured,or collected LPH = liquid-phase hydrocarbons Trace = less than 0.01 foot of LPH in well µo = micrograms per liter(approx.equivalent to parts per billion,ppb) mg/l = milligrams per liter(approx.equivalent to parts per million,ppm) ND< = not detected at or above laboratory detection limit TOC — top of casing(surveyed reference elevation) ANALYTES BTEX = benzene,toluene,ethylbenzene,and(total)xylenes DIPE = di-isopropyl ether ETBE — ethyl tertiary butyl ether MTBE = methyl tertiary butyl ether PCB = polychlorinated biphenyls PCE — tetrachloroethene TBA = tertiary butyl alcohol TCA — trichloroethane TCE = trichloroethene TPH-G = total petroleum hydrocarbons with gasoline distinction TPH-D — total petroleum hydrocarbons with diesel distinction TPPH = total purgeable petroleum hydrocarbons TRPH — total recoverable petroleum hydrocarbons TAME = tertiary amyl methyl ether 1,1-DCA = 1,1-dichloroethane 1,2-DCA = 1,2-dichloroethane(same as EDC,ethylene dichloride) 1,1-DCE — 1,1-dichloroethene I,2-DCE = 1,2-dichloroethene(cis-and trans-) NOTES I. Elevations are in feet above mean sea level. Depths are in feet below surveyed top-of-casing. 2. Groundwater elevations for wells with LPH are calculated as: Surface Elevation—Measured Depth to Water+(DP x LPH Thickness),where Dp is the density of the LPH,if known. A value of 0.75 is used for gasoline and when the density is not known. A value of 0.83 is used for diesel. 3. Wells with LPH are generally not sampled for laboratory analysis(see General Field Procedures). 4. Comments shown on tables are general. Additional explanations may be included in field notes and laboratory reports,both of which are included as part of this report. 5. A"J"flag indicates that a reported analytical result is an estimated concentration value between the method detection limit(MDL) and the practical quantification limit(PQL)specified by the laboratory. 6. Other laboratory flags(qualifiers)may have been reported. See the official laboratory report(attached) for a complete list of laboratory flags. 7. Concentration graphs based on tables(presented following Figures)show non-detect results prior to the Second Quarter 2000 plotted at fixed values for graphical display. Non-detect results reported since that time are plotted at reporting limits stated in the official laboratory report. 8. Groundwater vs. Time graphs may be corrected for apparent level changes due to resurvey. REFERENCE TRC began groundwater monitoring and sampling for Former BP Oil 1 1 195 in October 2003. Historical data compiled prior to that time were provided by Gettler-Ryan Inc.