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42 Model Predictions <br /> Using-a CS benzene concentration of 1 7 mg/l (measured in the SP-1 <br /> groundwater sample), the model predicts that the associated C,t concentrations <br /> decrease rapidly at a conservative distance of 30 feet from the source to be <br /> within the associated MCL This calculated rapid reduction is primarily <br /> influenced by the relatively low hydraulic conductivity of the subsurface that <br /> has been measured at this facility This model indicates that the concentration <br />' of benzene may exceed its associated MCL beyond its southern property <br /> boundary based on the current concentration results for well MW-11 <br /> However, it does not appear to pose a risk to potential receptors through the <br /> groundwater ingestion exposure route Historically, benzene has been non- <br /> detect at this location The first positive reported value for benzene was in the <br /> previous June 2004 event at 0 0021 mg/L <br /> Using a Cs TPH-G concentration of 20 mg/1 (measured in the SP-1 <br /> groundwater sample), the model predicts that the associated C,'concentrations <br /> decrease rapidly at a conservative distance of 24 feet from the source to be <br /> within the goal of 50 mg/L This calculated rapid reduction is primarily <br /> influenced by the relatively low hydraulic conductivity of the subsurface that <br /> has been measured at this facility This model indicates that the concentration <br /> of TPH-G may exceed its associated goal beyond its southern property <br /> boundary based on the current concentration results for well MW-11 <br /> However, it does not appear to pose a risk to potential receptors through the <br /> groundwater ingestion exposure route Historically, TPH-G has been non- <br /> detect at this location The first positive reported value for TPH-G was in the <br /> previous June 2004 event at 0 180 mg/L <br /> i <br /> i <br /> 1 <br /> E3 <br /> Quarterly Groundwater Monitoring Report <br /> October 2004 <br /> The Earthgralns Company Facility <br /> 2651 South Airport Way-Stockton,California <br /> Prepared for SARA LEE BAKERY GRUUP Prepared by Philip Services Corp <br /> H 1EW62400I321121382EGIStockton Airport WayUnvesttigation and Quarterly Reports\Querterly Report 10_2004 doc December 09,2004 <br />