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Jerry Moore 5491 F Street Page 3 of 3 • Cross sections showing subsurface geological features, depth to ground water, man-made conduits, monitoring: well construction and an interpretative drawing of the vertical and lateral extent of soil and ground water contamination. • Cross-plots of key chemical concentrations vs. time for representative . wells that demonstrate significant contaminant concentration trends. • Summary tables of contaminant concentrations in the different media. • Well and boring logs. • A narrative description of the SCM that describes controls on contaminant distribution; contaminant migration mechanisms, pathways and rates;. plume disposition over time; and' sorbed and dissolved contaminant masses. While not necessarily showing all data in -diagrams and drawings, an adequate SCM can be utilized to account for .most of the known data and to illustrate. additional assessment needs. All analytical data should be included in tables. Methods and calculations of contaminant masses should be included in the SCM, and may be submitted as an appendix. The site conceptual .model should be updated each time new data is acquired that causes a change of interpretation or expands the model until model modifications . are not needed to explain subsequently acquired data. As the SCM becomes complete, it can be utilized to reasonably predict additional investigation results and plume response to various remedial technologies or to changes in ground water flow regime. The model should adequately demonstrate,-all interpretations and opinions. Questions or comments may be directed to Nuel Henderson at (209).468-3436. Donna Heran, REHS, Director Environmental Health Division Nuel C. Henderson, Jr., R.G.. Margaret agorio. R.E. Unit IV - Site Mitigation Supervisor, Unit IV C: James L.L. Barton CVRWQCB Scott Romine —APEX Envirotech, Inc.