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rC-- TABLE KEY ,1 ABBREVIATIONS / SYMBOLS LPH = liquid-phase hydrocarbons µg/l = micrograms per liter mg/1 = milligrams per liter ND = not detected at or above laboratory detection limit DTSC = Department of Toxic Substances Control N/A = not applicable Trace = less than 0.01 foot of LPH in well UST's = underground storage tanks -- = not analyzed, measured, or collected TPH-G = total petroleum hydrocarbons with gasoline distinction BTEX = benzene, toluene, ethylbenzene, and total xylenes TPH-D = total petroleum hydrocarbons with diesel distinction TRPH = total recoverable petroleum hydrocarbons MTBE = methyl tertiary butyl ether TAME = tertiary amyl methyl ether ETBE = ethyl tertiary butyl ether DIPE = di-isopropyl ether TBA = tertiary butyl alcohol -DCA = 1,1-Dichloroethane 1,2-DCA = 1,2-Dichloroethane 1,1-DCE = 1,1-Dichloroethene 1,2-DCE = cis- and trans-1,2-Dichloroethene PCE = tetrachloroethene TCA = trichloroethane TCE = trichloroethene PCB = polychlorinated biphenyls TPPH = total purgeable petroleum hydrocarbons NOTES Elevations are in feet above mean sea level. Groundwater elevation for wells with LPH is calculated as follows: Surface elevation — depth to water + (0.75 x LPH thickness). Concentration Graphs have been modified to plot non-detect results at the reporting limit stated in the official laboratory report. All non-detect results prior to the Second Quarter 2000 were plotted at 0.1 µg/I for graphical display. J = estimated concentration, value is between the Method Detection Limit (MDL) and the Practical Quantitation Limit (PQL ) REFERENCE TRC began groundwater monitoring and sampling activities in October 2003. Historical data for Former BP 11195 was provided by Gettler-Ryan Inc., Dublin, California, in an excel table received in September 2003.