The goal of this research project is to study a road base at the Minnesota Road Research Facility (MnROAD) constructed with high carbon fly ash for long term monitoring of engineering and environmental characteristics. This study will provide a controlled long term evaluation of pavement base materials stabilized with High Carbon Fly Ash (HCFA). Engineering laboratory testing has shown HCFA to be a viable stabilizing material. Field construction of road test segments is necessary to validate the structural and environmental performance of high carbon fly ash stabilized bases. This report concerns the results of ongoing environmental chemical analysis of leachate collected from test cells using off-classification HCFA as a stabilizer of road base materials under an asphalt wearing course. This research opportunity is a portion of Phase II of a fly ash stabilization project performed by Bloom Consultants, LLC and is sponsored by the Department of Energy (DOE). The University of Wisconsin-Madison (UW) is a subcontractor of Bloom Consultants and is conducting ongoing evaluations as the project proceeds. Phase II is titled Use of High Carbon Fly Ash to Stabilize Recycled Pavement as Base Course, has a two-year time requirement, and will involve the proposed MnROAD test sections to be constructed in 2007.