Descr: The MADE site is a testing ground for groundwater flow and contaminant transport in heterogeneous aquifer systems dominated by fluvial (braided stream) depositional environments. The MADE site has been the focus of extensive tracer tests in the last decade involving tracer injection experiments and more than 100 monitoring wells in a 200mx200m area. These experiments and groundwater flow/contaminant transport modeling have identified the heterogeneity of the aquifer system (dictated by the mixture of course gravel to clay partical sizes) as a key aspect of understanding the rate and dispersion of contaminants in the area. An agressive coring program funded by NSF will begin in Fall 2002, and will involve a dye tracer test and freeze-coring at ca. 20 boreholes in the area. This experiment is designed to establish a stratigraphic framework for subsurface hydroloic conductivity models that will be used to refine contaminant transport models and to guide in placement of the boreholes in the upcoming coring program. We propose to use the PASSCAL high resolution seismic equipment to conduct a dense 2D survey of the area. The data will be interpreted in a sequence stratigraphic context, tying to nearby outcrops in quarrys, to the 4 previously cored boreholes at the test site, and to the cores to be obtained in the upcoming program. Personel include Dr. D. Harry (geophyscs), Dr. Antonio Rodriguez (clastic sedimentology and stratigraphy), Dr. C. Zheng (groundwater flow and contaminant transport), and Mr. Jerry Bowling (Ph.D. candidate)
