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TABLE KEY ABBREVIATIONS 1 SYMBOLS LPH = liquid-phase hydrocarbons µg11 = micrograms per liter mg/1 = milligrams per later ND = not detected at or above laboratory detection Imut DTSC = Department of Toxic Substances Control N/A = not applicable Trace = less than 0 01 foot of LPH an well USTs = 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 = da-isopropyl ether TBA = tertiary butyl alcohol 1,1-DCA = 1,1-Dachloroedme 1,2-DCA = 1,2-Dacbloroedme i,1-DCE = 1,1-Dachloroethene 1,2-DCE = cis- and trans-l,2-Dichloroethene PCE = tetrachloroethene TCA = trichloroethane TCE = trichloroethene PCB = polychlorinated biphenyls TPPH = total purgeable petroleum hydrocarbons NOTES Elevations are an 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 an the official laboratory report All non-detect results prior to the Second Quarter 2000 were plotted at 0 1 µg/l for graphical display J = estimated concentration, value is between the Method Detection Limit (MDL) and the Practical Quantitation Lumt (PQL) REFERENCE TRC began groundwater monitoring and sampling activities in October 2003 Historical data for Circle K Store 01205 was provided by Gettler-Ryan Inc , Dublin, California, in an excel table received to September 2003