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1 <br /> Geolagicai rechnks Inc. Page 5 <br /> Initial Site Conceptual Model <br /> Project No. 1030.2 <br /> June 18,2003 <br /> The deep geology of the site is primarily poorly sorted sand with varying amounts of silt <br /> and clay. The screen interval of the deep well (MW-101) is located in dirty sand. MW-101 <br /> ' is the only deep well and defining the deep geology is limited to this data. <br /> 4.5 Biodegradation Indicators <br /> ' The results of the Natural Attenuation Parameter NAP tests are summarized in Table 4 and <br /> ' field parameters are summarized in Table 5 of Appendix A. Additional discussion and <br /> laboratory analytical results can be reviewed in GTI's: I" Quarter 2003 Groundwater <br /> Monitoring Report—April 24, 2003. <br /> ' Below are classifications of the wells resulting from the current monitoring data: <br /> • Wells considered near the center of the contaminated plume include MW-1. <br /> • Wells considered to be near the margins of the plume include MW-4 & MW-101. <br /> • Wells considered to represent background conditions include MW-2, 3 & domestic well. <br /> ' The hydrocarbon analytical data correlates well with these classifications, with MW-1 being <br /> the only impacted well. <br /> The following table gives general characteristics of background conditions compared to <br /> conditions inside the plume. m� i, l �� cu d d._.,� t•w�� ,J�, ��,,f�;„��r/ 7 <br /> ' Parameter Source of the Background Plume Plume <br /> Parameter Behavior Behavior <br /> ' Core Margins <br /> Nitrate' e Acceptor Slightly Enriched Depleted Not Depleted <br /> Ferrous Iron Metabolic Byproduct Slightly Enriched Slightly Enriched Not Enriched <br /> Sulfate' e Acceptor Site Specific Slightly Enriched Mildly Depleted <br /> Temperature Metabolic Byproduct Site Specific Elevated Slight Elevated <br /> pH Metabolic Byproduct Site Specific Slightly Lower Slightly Higher <br /> ' Alkalinity Metabolic Byproduct Site Specific Enriched Mildly Depleted <br /> Redox Potential Metabolic Byproduct Negative Value Depleted Slightly Lower <br /> Conductivity Metabolic Byproduct Site Specific Elevated Unaffected <br /> ' e=electron <br /> Terminal electron accepting process: <br /> 1 =denitrification <br /> .... .. 2=reduction <br />