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Jerry Moore <br /> 5499 F Street <br /> Page 3 of 3 # <br /> J <br /> • Cross sections showing subsurface geological features, depth to ground <br /> water, man-made conduits, monitoring well construction and an <br /> interpretative drawing of the vertical and lateral extent of soil and ground <br /> water contamination. <br />` Cross-plots of key chemical concentrations vs. time for representative <br /> wells that demonstrate significant contaminant concentration trends. <br /> Summary tables of contaminant concentrations in the different media. <br /> + Well and boring logs. <br /> A narrative description of the SCM that describes controls an contaminant <br /> distribution; contaminant migration mechanisms, pathways and rates; <br /> plume disposition over time; and sorbed and dissolved contaminant <br /> masses. <br /> While not necessarily showing all data in diagrams and drawings, an adequate <br /> SCM can be utilized to account for most of the known data and to illustrate <br /> additional assessment needs. All analytical data should be included in tables. <br /> Methods and calculations of contaminant masses should be included in the SCM, <br /> and may be submitted as an appendix. The site conceptual model should be <br /> updated each time new data is acquired that causes a change of interpretation or <br /> expands the model until model modifications are not needed to explain <br /> subsequently acquired data. As the SCM becomes complete, it can be utilized to <br /> reasonably predict additional investigation results and plume response to various <br /> IE remedial technologies or to changes in ground water flow regime. The model <br /> should adequately demonstrate all interpretations and opinions. <br /> s <br /> Questions or comments may be directed to Nuel Henderson at (209) 468-3436. <br /> i <br /> Donna Heran, REHS, Director <br /> Environmental Health Division s <br /> Nuel C. Henderson, Jr., R.G". Margare Lagorio. R, H.S. # <br /> Unit IV - Site Mitigation Supervisor, Unit IV <br /> C. James L.L. Barton — CVRWQCB <br /> Scott Romine — APEX Envirotech, Inc. <br /> E <br /> l <br /> I <br /> l# <br />