Laserfiche WebLink
The scenario simulation predicts groundwater elevations and TCE concentrations via a <br /> transient model run which is run for 30 years into the future. The following table <br /> summarized the key boundary conditions and/or TCE source area conditions employed in <br /> the simulation of the Revised Feasibility Study Alternative 4: <br /> Table A4: Alternative 4 MODFLOW/RT3D Modeling Inputs <br /> Model Boundary Condition/Property Conditions in Alternative 4 Modeling Scenario <br /> Domestic/Agricultural Pumping Wells Pumping terminated for entire model run at wells <br /> MW-11, MW-9, and irrigation wells at Ripon <br /> Christian and Ripon Public schools (RC-1, RC-2, <br /> RPS-1, and RPS-2) and Caltrans well. <br /> Average quarterly extraction rates from calendar <br /> year 2008 used for all other domestic and <br /> agricultural wells throughout transient model run. <br /> Remediation Wells Extraction wells EU-3 and EU-4 (Upper Aquifer <br /> IRAP wells) assumed to continue pumping at 30 <br /> gpm for the first 3 years and assumed OFF <br /> beginning in year 4. <br /> E-2 and E-6 assumed OFF throughout transient <br /> model run. <br /> Source Area Remediation Effects of in-situ treatment at Industrial Avenue <br /> source area in the Upper Aquifer simulated <br /> through 75% reduction of fixed TCE concentration <br /> value in source area cells during the fourth year of <br /> the model run. <br /> Prior to and following fourth year of model run, all <br /> TCE source area (fixed concentration)cells <br /> assumed to degrade at base model-established <br /> intrinsic biodegradation rate k = 0.000316 day-'). <br /> Other adjustments to base period Vertical transmissivity at municipal wells MW-4 <br /> conditions: and MW-6, and Neenah Paper Company wells <br /> TH-8, TH-10, S-1, S-2, S-3, S-4, S-5 adjusted to <br /> mitigate vertical migration at these locations. <br /> The primary areas of TCE impacts and changes over time in predicted TCE distribution in <br /> the Upper Aquifer under this future modeling are illustrated in figures A-40 through A-43, in <br /> the Intermediate Aquifer in figures A-44 through A-47; and in the Lower Aquifer in figures <br /> A-48 through A-51. Figure A-52 shows the 3D distribution of TCE concentrations greater <br /> than 5 pg/L beneath the Study Area after 30 years.. <br /> 1 Environmental Cost Management, Inc., June 12, 2007, Final Groundwater Model Report, <br /> Former Nestle USA Inc. Facility, Ripon, CA <br /> 2 Environmental Cost Management, Inc., August 10, 2007, Interim Remedial Action Plan <br /> for 230 Industrial Avenue, Former Nestle USA Inc. Facility, Ripon, CA <br /> 6 <br />