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i k <br /> 5.2.3 Model Out ut <br /> U I <br /> Following calibration of the model for Sands A and B in which Stratus selected all input <br /> parameters for both zones, the model was run and the simulation time increased incrementally to i <br /> determine the time and location of the endpoint of the MTBE plume's degradation. The input ! <br /> data and model output for Sand A and Sand B prediction simulations are included in <br /> Appendix C. <br /> The modeling predicts that, by the year 2018, the residual MTBE plume at the secondary MCL <br /> of 5.0 pg/L in Sand A will reach a distance of approximately 400 feet downgradient (north- <br /> northwest) of the source area. The modeling also predicts that, by the year 2024, the residual <br /> MTBE plume at the secondary MCL of 5.0 pg/L in Sand B will reach a distance of <br /> approximately 250 feet downgradient (north-northwest) of the source area. Based on modeling <br /> results, MTBE concentrations in well MW-13A/B are expected to reach the secondary MCL of <br /> 5.0 pg/L by 2017 (conservatively assuming all impact measured by this cross-screened well is <br /> travelling within Sand B). <br /> k <br /> V' <br /> Page 22 5-MA7U5 <br />