1	WiscLEACH -- Predicting Ground Water Impacts from Byproducts in Roadways by Craig H. Benson, Lin Li, and Tuncer B. Edil Geo Engineering Program Department of Civil and Environmental Engineering University of Wisconsin-Madison Madison, Wisconsin 53706 USA www.uwgeoengineering.org
2	Model Objectives Develop model for evaluating potential ground water impacts associated with industrial byproducts used in roadways. Development Criteria Physical basis in transport processes Simple to use (practitioner, regulator) Straight forward & available input Rapid execution
3	Approach Develop fast and user-friendly model by combining analytical solutions for ADRE in the vadose and saturated zones (WiscLEACH) Calibrate with validated code for two-dimensional flow & transport (HYDRUS-2D) Verify by comparison with field data from STH 60 lysimeters
4	Key Assumptions Steady-state one-dimensional flow in vadose zone Steady-state two-dimensional flow in saturated zone, but primarily horizontal flow Instantaneous linear reversible sorption in vadose and saturated zones No reactions occurring in vadose and saturated zones beneath byproducts layer Advective-dispersive transport with longitudinal and transverse dispersion in vadose and saturated zones
5
6	First Flush Case: Analytical Solution -- Vadose Zone Applies to cases where instantaneous sorption-controlled release occurs with linear partitioning
7	"Use analytical solution (Leij..." Use analytical solution (Leij et al. 1991) Applies to all other cases
8
9
10
11	"Field measurements of precipitation" Field measurements of precipitation, volumetric flux, and concentrations in lysimeters for CCB test sections at STH 60 field site near Lodi, Wisconsin. Transport parameters from column tests on fly ash stabilized soils and bottom ash. Compare concentrations predicted by WiscLEACH to measured concentrations in lysimeters.
12
13
14
15
16
17
18
19
20	Typical Output: Se Concentration - 10 yr
21	Typical Output: Se Concentration - 30 yr
22	Typical Output: Se Concentration - 45 yr
23	Sensitivity: Ground Water Table Depth
24	Sensitivity: Thickness of Byproduct Layer
25	Sensitivity: Percolation Rate in Vadose Zone
26
27	Summary
28	Support provided by:
29	Program Availability WiscLEACH will be available as freeware in December 2006. Downloads will be available from the UW-Madison Geo Engineering Software Site: www.uwgeosoft.org.