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1 <br /> The results for sample TX-MW-14-49 reported concentrations of MTBE, ETBE, TBA, and <br /> ' 1,2-DCA. The reported concentration of 17 µg/L and 1.4 µg/L exceeded the California MCLs <br /> for MTBE and 1,2-DCA, respectively. The results for sample TX-MW-21-80 reported <br /> concentrations of TPH-g, BTEX, and TBA. The reported concentration of 400 Pg/L exceeded <br /> ' the California MCL for benzene. <br /> 2.5 Evaluation Of Contaminant Plume <br /> ' The lateral extent of impacts to the saturated soil beneath the Site appears to cover most of the <br /> Site due to on and off-site source areas. The lateral extent of impact in groundwater beneath <br /> ' the Site including adjacent properties on West Charter Way and South Lincoln Street has yet <br /> to be defined. The vertical extent of impact in groundwater beneath the Site has yet to be <br /> fully defined. However, based on the consistent clay layer encountered at 120 feet bgs and <br /> the non-detect analytical results of soil samples collected near that depth, PSC does not <br /> believe the impact to groundwater is deeper than approximately 120 feet. The groundwater <br /> samples collected from the newly installed well CT-MW-9-120 report TPH-g at 73 pg/L and <br /> benzene at 0.68 µg/L for this event. <br /> ' Based on analytical results from this quarterly event and results from samples collected on the <br /> neighboring sites, the groundwater plume from the sites are commingled. Groundwater flow <br /> in the shallow permeable zones is variable both temporally and from site to site. Groundwater <br /> flow in the deeper permeable zones is generally to the east-southeast. Wells screened in the <br /> "A" zone appear to be impacted near source areas. Based on sample results from wells <br /> ' screened in the `Br' zone, the commingled plume appears to be migrating in a general easterly <br /> direction. <br /> 1 <br /> r <br /> ' Quarterly Groundwater Monitoring Report <br /> First Quarter—January 2010 <br /> Prepared For:Sara Lee Bakery Group,Inc. Prepared By:PSC Industrial Outsourcing,LP <br /> ' Sam lte—Lincoln Street\20 10_01_Q I-QMR(Lincoln).doc May 10,2010 <br /> 9 <br />