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%W VW <br /> Harold and Dena Knowles <br /> 102 S.Wilson Way <br /> Page 4 of 4 <br /> • Local and regional plan view maps with sources, boring and monitoring <br /> well locations, lines of cross section, extent of contaminants in each <br /> media, direction and rate of ground water flow, and receptor locations, <br /> including water supply wells within 2,000 feet of the site. <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 extent of soil and ground water <br /> 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 on 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 /> remedial technologies or to changes in ground water flow regime. The model <br /> should adequately demonstrate all interpretations and opinions. <br /> Questions or comments may be directed to the undersigned at (209) 468-3436 or <br /> by mail (address on the letterhead). - <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Nuel C. Henderson, Jr., RG Margaret agorio, REHS <br /> Site Mitigation, Unit IV Supervisor, Unit IV <br /> C: James L.L. Barton - CVRWQCB <br /> Gregory Stahl - GZA <br />