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• TABLE KEY <br /> ABBREVIATIONS / SYMBOLS <br /> LPH = liquid-phase hydrocarbons <br /> µg/l = micrograms per liter <br /> mg/l = milligrarris per liter <br /> ND = not detected at or above laboratory detection lunit <br /> DTSC = Department of Toxic Substances Control <br /> N/A = not applicable <br /> Trace = less than 0 01 foot of LPH in well <br /> USTs = underground storage tanks <br /> = not analyzed, measured, or collected <br /> TPH-G = total petroleum hydrocarbons with gasoline distinction <br /> BTEX = benzene, toluene, ethylbenzene, and total xylenes <br /> TPH-D -= total petroleum hydrocarbons with diesel distinction <br /> TRPH = total recoverable petroleum hydrocarbons <br /> MTBE = methyl tertiary butyl ether <br /> TAME = tertiary amyl methyl ether <br /> ETBE = ethyl tertiary butyl ether <br /> DIPE = dr-isopropyl ether <br /> . TBA = tertiary butyl alcohol <br /> 1,1-DCA = 1,1-Dichloroethane <br /> 1,2-DCA = 1,2-Dichloroethrie <br /> 1,1-DCE = 1,1-Dichloroethene <br /> 1,2-DCE = cis- and trans-1,2-Dichloroethene <br /> PCE = tetrachloroethene <br /> TCA = trichloroethane <br /> TCE = trichloroethene <br /> PCB = polychlorinated biphenyls <br /> TPPH = total purgeable petroleum hydrocarbons <br /> NOTES <br /> Elevations are in feet above mean sea level <br /> Groundwater elevation for wells with LPH is calculated as follows <br /> Surface elevation — depth to water + (0 75 x LPH thickness) <br /> Concentration Graphs have been modified to plot non-detect results at the reporting limit stated in the <br /> official laboratory report All non-detect results prior to the Second Quarter 2000 were plotted at 0 1 <br /> µg/I for graphical display <br /> J = estimated concentration, value is between the Method Detection Limit <br /> (MDL) and the Practical Quantitation Limit (PQL ) <br /> REFERENCE <br /> TRC began groundwater monitoring and sampling activities in October 2003 Historical data Former 76 <br /> Station 4409 was provided by Gettler-Ryan Inc , Dublin, Calitornia, in an excel table received in September <br /> 2003 <br />