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• • <br /> Mr. Marshall Cloud <br /> July 20, 2006 <br /> Page 3 <br /> 9.) Figure 3-7, EarthVision Geologic Model; The figure shows limited lithologic <br /> formations, monitoring well locations with no identifiers, and obscures the <br /> view of the base boundaries in general. DTSC recommends omitting the <br /> figure from the report since it does not provide any useful information <br /> pertaining to the numerical ground water modeling at DDJC-Sharpe. <br /> 10.) Figures 3-8 thru 3-12, Layer Conductivity Zones; The DDJC-Sharpe site <br /> boundary is not identified in the figures and should be inserted to verify that <br /> the conductivity zones are appropriate. <br /> 11.) Page 4-7, Table 4-1, Soil Categories and Respective Model Parameters; <br /> Various parameters appear to be identical for the individual layers indicating <br /> the use of literature values rather than site specific measured values. DTSC <br /> recommends using site-specific values rather than literature values whenever <br /> possible to increase the accuracy of the ground water model. <br /> 12.)Appendix B, Ground Water Hydrographs; The "rainfall" in the hydrographs <br /> should be revised and be presented as "bars" rather than "lines" to represent <br /> rain as a discontinuous function rather than continuous function as shown. <br /> 13.) Page 5-2, section 5.2.2.4; See comment#10. <br /> 14.) Page C-1, DDJC-Sharpe Depot Extraction Wells Located in the Model <br /> Domain; The column showing the extraction rate for the various EWs is <br /> shown with a negative sign in front of the extraction volume and should be <br /> revised since a negative volume is not physically possible. If a negative sign <br /> was assigned to show the removal of the ground water, then this should be <br /> noted at the end of page C-4. <br /> If you have any questions or comments regarding this letter, please feel free to contact <br /> me at (916) 255-3713, or e-mail me at pmacnichCaD_dtsc.ca.00v. <br /> Sincere <br /> Peter MacNicholl, P.E. <br /> Remedial Project Manager <br /> Federal Facilities Unit <br /> cc: See DDJC-Sharpe Distribution List. <br />