ARCHIVED REPORTS XR0008685 - Laserfiche WebLink

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TABLE KEY ABBREVIATIONS I SYMBOLS LPH = liquid-phase hydrocarbons µgh = micrograms per liter mg1l - milligrams per liter ND = not detected at or above laboratory detection limit DTSC - Department of Toxic Substances Control NIA = not applicable Trace - less than 0 01 foot of LPH in 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 = di-isopropyl ether TBA = tertiary butyl alcohol j 1,1-DCA - I,1-Dichloroethane 1,2-DCA - 1,2-Dichloroethane 1,1-DCE 1,1-Dichloroethene 1,2-DCE cis-and trans-l,2-Dichloroethene PCE = tetrachloroethene TCA = trichloroethane TCE = trichloroethene PCB = polychlorinated biphenyls j 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/l 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 76 Station 4409 was provided by Gettler-Ryan Inc , Dublin, California, in an excel table received in September 2003