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Tf - - <br /> Third Quarter 2005 Quarterly Groundwater Monitoring Report <br /> Stockton Center Site Authority—University Park <br /> October 18,2005 <br /> Page 3 of 6 <br /> groundwater in the monitor wells was 39.73 feet below the surveyed well collar measuring points (the <br /> measuring points are slightly below the ground surface). The average groundwater elevation measured in <br /> the monitoring wells increased 0.36 foot between May 2, 2005 and September 1, 2005. The estimated <br /> groundwater gradient for the Site on September 1, 2005, was 0.0006 ft/ft to the northeast and is shown in <br /> Figure 2, attached. <br /> Table 2 Groundwater Elevation Data(September 1,2005) <br /> Well Number TOC Elevation(feet) Depth to Groundwater(feet), Groundwater Elevation{feet) <br /> MW-1 17.42 39.77 -22.35 <br /> MW-2 17.59 39.90 -22.31 <br /> } MW-3 17.16 . 39.52 =22.36 <br /> f TOC=Top of Casing <br /> TQC Elevation:Referenced to NAVD88 datum from NGS Benchmark HS3999. <br /> t LABORATORY ANALYTICAL RESULTS <br /> Groundwater samples were collected from monitor wells MW-1, MW-2, and MW-3 on September 1, <br /> 2005,after purging. All groundwater samples were analyzed for total petroleum hydrocarbons quantified <br /> as gasoline (TPH-G) by EPA Method 8015M, for benzene, toluene, ethyl benzene, and total xylenes <br /> i' <br /> (BTEX) by EPA Method 8020, and for gasoline oxygenates/additives by EPA Method 8260B. The <br /> gasoline oxygenates/additives included methyl tertiary-butyl ether (MTBE), ethanol, tertiary-butanol <br /> (TBA), di-isopropyl ether (RIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), <br /> 1,2-dibromoethane (EDB or 1,2-DBA), and 1,2-dichloroethane (1,2-DCA). The groundwater samples <br /> were also analyzed for total petroleum hydrocarbons quantified as kerosene, diesel, and motor oil (TPH- <br /> K, -D, and -MO) by EPA Method 8015M. The laboratory analytical results for the groundwater samples <br /> collected from the monitor wells on September 1, 2005, are presented in Table 3, on the next page, and in <br /> Figure 3, attached. Historical groundwater monitoring data and the laboratory report (certificates of <br /> analyses and chain-of-custody record) are also attached. <br /> f <br /> i <br /> w <br /> i t <br /> 1 - <br /> { <br /> 1 <br /> llf t� CONDOR <br />