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i <br /> Quarterly Monitoring Report <br /> fY <br /> Y� <br /> ' Fourth Quarter - 2004 <br /> y i <br /> E <br /> 1 .0 Introduction � <br /> 1.1 Scope of Work <br /> Environeering Inc (El) has been retained by California Tank Lines, Inc (CTL) to provide <br /> professional environmental services at 3105 South El Dorado Street, Stockton, CA (the Site) <br /> The location of the Site is shown on Figures 1 and 2 Tlus report documents the fourth quarter <br /> ' of groundwater sampling conducted at the Site on December 17, 2004 The period covered in <br /> this report is from September 2004 to December 2004 <br /> 1.2 Monitoring Activities Performed <br /> ti <br /> y Groundwater monitoring and sampling at the Site during this quarter took place on December <br /> 17,2004 This quarter's sampling included the following <br /> 'h F <br /> • Groundwater elevation measurements in all wells <br /> . ■ Testing for natural attenuation indicators of groundwater samples, including pH, <br /> conductivity,and temperature <br /> ■ Removal of free product in MW-2 <br /> ■ Quarterly groundwater sampling of monitor wells MW-1,MW-2,MW-3,and MW-4 <br /> i <br /> ■ Laboratory analysis of ground water samples for { <br /> 4 <br /> o Volatile Organic Compounds [benzene, toluene, ethylbenzene and xylenes <br /> (BTEX)],Fuel Oxygenates [methyl-tert-butyl ether(MTBE),di-isopropyl ether <br /> (D1PE), ethyl-tertiary-butyl ether (EtBE), tertiary-amyl-methyl ether (TAME), <br /> I tertiary-butanol (TBA), 1,2-dibromoethane (EDB), 1,2-dichloroethane j <br /> (DCA12)], and TPH gasolme by EPA Method 8260B Volatile Organic <br /> Compounds by Gas Chromatography/Mass Spectrometry(GC/MS) <br /> i <br /> Y o Total petroleum hydrocarbons as diesel and motor oils (TPH-diesel and TPH- i <br /> oil)by Method LUFT GC/MS <br /> The locations of all monitor wells as well as historical boreholes are shown on Figure 3 ] <br /> Appendix A provides a historical summary of field activities at the site and Appendix B <br /> PPe P �'Y PPe <br /> contains this quarter's original Well Purging and Sampling Documentation The laboratory <br /> results of the groundwater analyses for the current monitoring period as well as historical <br /> results are shown on Table 2 Laboratory Analytical Reports and the Chain-of-Custody Form <br /> are provided in Appendix C <br /> 1 <br />