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APPENDIX B <br /> Diamond Pet Food Processors of Ripon,LLC June 30,2011 <br /> Report of Waste Discharge—Groundwater Modeling Page 2 of S <br /> were rendered inactive, as the river is a hydrologic boundary. Figure 2 (following the main text of <br /> the ROVWD) shows the model area relative to vicinity features; Figure B-1 shows the model area with <br /> the grid pattern and boundary conditions. <br /> LAYERS <br /> The layers for the model were established based on the stratigraphy observed in onsite wells; boring <br /> logs for these wells have been presented in numerous reports, such as the Water Quality Protection <br /> Standard Report.15 The section, as defined for the model, consists of higher-permeability aquifer <br /> zones (the semiperched, upper, and intermediate aquifers) divided by lower permeability units. <br /> All layers were classified in the model as "convertible"; that is, they could be confined or unconfined, <br /> depending on the water level in the model. This is the default mode for GMS. <br /> Total thickness of all layers in the model is about 275 feet; each layer is of variable thickness, <br /> depending on the stratigraphy. The top and bottom elevations of the layers were the same as used in <br /> the 1996 groundwater model for the site.16 The top elevation of the model was set at 60 feet MSL. <br /> AQUIFER PROPERTIES <br /> The aquifer properties that must be defined for flow modeling in Modflow are hydraulic conductivity <br /> and storage properties. Hydraulic conductivity(K) can be defined for the three principal axes (x, y, <br /> and z of the model). By default, conductivity in the x and y directions are assumed to be the same, <br /> and conductivity in the z direction(vertically) is assumed to be 1/10th that of the x direction. The <br /> default assumptions for KZ were used initially, but later adjusted for better calibration. <br /> Storage properties include specific storage (which equals the storage coefficient, from the aquifer <br /> test, divided by aquifer thickness) and specific yield. Specific yield is required only for unconfined <br /> layers. Table B-1 summarizes the aquifer properties used in the model. These properties reflect <br /> results from aquifer tests conducted at the site and typical values for the types of sediments. <br /> 15 Lawrence&Associates,March 31,2004, Water Quality Protection Standard Report,Fox River Paper Company, <br /> Ripon Mill,Ripon, California. <br /> 16 Lawrence&Associates,April 1996,Impacts on Receiving Waters from Discharge at Simpson Paper Company <br /> Facility,Ripon, California. <br /> 010107.00, Task I Lawrence&Associates <br /> w:Iclientsldiamondpetfoods1010107.00-riponrow&diamondpet rowd_june2011 draft.docx <br />