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L <br /> a <br /> • TABLE KEY <br /> ABBREVIATIONS 1 SYMBOLS <br /> LPH = liquid phase hydrocarbons <br /> µg11 = micrograms per liter <br /> mg/l = milligrams per liter <br /> ND = not detected at or above laboratory detection limit <br /> DTSC = Department of Toxic Substances Control <br /> NIA = not applicable <br /> Trace = less than 0.01 foot of LPH m 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 ternary butyl ether <br /> DIPE = ch-isopropyl ether <br /> . TBA = tertiary butyl alcohol <br /> 1,1-DCA = 1,1-Dnchloroethamne <br /> 1,2-DCA = 1,2-Dnchloroedaw <br /> 1,1-DCE = 1,1-Dnchloroethene <br /> 1,2-DCE = cis- and trans-1,2-Dnchloroethene <br /> PCE = tetrachloroethene <br /> TCA = trichloroethane <br /> TCE = trichloroethene <br /> PCB = polychlormated biphenyls <br /> TPPH = total purgeable petroleum hydrocarbons <br /> NOTES f <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/l for graphical display <br /> 3 = estimated concentration, value is between the Method Detection Lunit <br /> (MDL) and the Practical Quantitation Limit (PQL) <br /> . REFERENCE <br /> TRC began groundwater monitoring and sampling activities m October 2003 Hnstorncal data for Former <br /> BP O:1 11192 was provided by Gettler-Ryan Inc , Dublin, California, in an excel table received m <br /> September 2003 <br />