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San Joaquin County•ironmental Health Department • Attachment A. <br /> Site Conceptual Model <br /> The Site Conceptual Model (SCM) is a written description supported by maps, <br /> geological cross-sections, tables, and diagrams that provide information about <br /> the site. The SCM should include the following: <br /> 1 . Local and regional plan view maps showing location of sources, extent of <br /> contamination (i.e., an interpretive drawing - not merely a plot of laboratory <br /> results), direction and rate of groundwater flow, and locations of receptors. <br /> "Receptors" include, but are not limited to, all supply wells within 2000 feet <br /> of the source area; <br /> 2. Cross-sections showing subsurface geologic features, depth of <br /> groundwater, man-made conduits, monitoring well construction, and an <br /> interpretive drawing of the vertical extent of soil contamination; <br /> 3. Plots of key chemical concentrations vs. time (e.g., plots should be shown <br /> for monitoring wells that demonstrate significant trends in contaminant <br /> concentrations); <br /> 4. Summary tables of chemical concentrations in different media; <br /> 5. Dissolved and adsorbed contamination mass estimates supported by <br /> calculations; <br /> 6. Boring and well logs (including construction/screening). <br /> As new data is collected, the SCM should be updated and the update should be <br /> submitted to EHD in quarterly monitoring reports. <br /> Work plans should be submitted in a timely manner to collect data in areas where <br /> the soil and groundwater plume is undefined. <br />