Copy of D_Alts_modeling_101918Modeling 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 Supply Wells - Existing and Replacement Pumping Rate (gpm)
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 3 RW - A RW - B RW - C RW - D RW - E RW - 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
Municipal Supply 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