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D_Alts_modeling_101918
Modeling Assumptions Table DRAFT Scenario Scenario Description LBWC 1 LBWC 4 LBWC 5 TKWC 1 1‐Baseline 720 1000 2‐Replacement 720 3‐Replacement 720 4‐Replacement 720 5‐Replacement 720 1000 6‐Replacement 720 1000 7‐Replacement TKWC 1 and 2 and LBWC 2 and 4 Replacement 720 8‐Wellhead Treatment TKWC 2 (Layer 2 (TKZ4) and Layer 3 (TKZ1 +TKZ2)for plume capture 720 9‐Wellhead Treatment LBWC 5 (Layer 2 (TKZ4)for plume capture 720 750 1000 10‐Wellhead Treatment LBWC 4 and 5 (Layer 2/TKZ4) for plume capture 720 400 400 11‐Extract, Treat, Reuse/Dispose 21 extraction Layer 1 wells in vicinity of EW‐1 720 1000 12‐In‐situ remediation 3,800 LF permanent iron filing wall in Layer 1 by LBWC 4 720 1000 10/19/2018 Municipal Su TKWC 1 and 2 Replacement LBWC 2 and 4 Replacement 13‐in‐situ remediation X locations in Layer 1 w/ PCE half life of y years based on hydrogen peroxide 720 1000 14??? 15???? 12‐Extract, Treat, Reuse/Dispose 21 extraction Layer 1 wells in vicinity of EW‐1 720 1000 TKWC 2 TKWC 3RW ‐ ARW ‐ BRW ‐ CRW ‐ DRW ‐ ERW ‐ F? 550 1750 1750 2100 1750 2100 1750 2100 550 1750 800 550 1750 800 1750 800 1800 1750 550 1750 550 1750 550 1750 upply Wells ‐ Existing and Replacement Pumping Rate (gpm) Screened in Layer 3 (TKZ2 and TKZ1) Select Location RW‐A, RW‐B, or RW‐C based on initial runs 550 1750 550 1750 Comments/Other Assumptions Modeling Status Scenario Benefits Scenario Challenges Historic based on annual pumping, future pumping rates in model to be verified complete verify LBWC pumping rates extraction well pumping rate = 40 gpm, estimate 70 kg of PCE removal complete The accelerated decay rate was applied over a row of cells with varying initial concentrations ranging from 5 to 145 ug/l. Half‐life of 193 hours was applied for the entire simulation, 2018‐2038. What year dies the 145 ugl/l = zero? ‐ est 40 kg of PCE removal complete Adjust pumping rate in capture well(s) as needed, Excess water beyond demand to South Tahoe PUD? Verify Total TKWC pumping rates to meet demand verify Total LBWC pumping rates to meet demand extraction well pumping rate = 100 gpm in‐process