Monday, April 29, 2013
A baseline water resources study was performed in several small watersheds in a remote part of southern Guam as part of a landfill siting study. There was little existing information regarding hydrogeologic and surface water flow conditions in the area. The study consisted of installing multilevel monitoring wells, performing borehole geophysics, installing stream gages/piezometers, performing groundwater and surface water sampling, performing aquifer testing and building a site conceptual model for groundwater and surface water resources. The innovative use of manually installed drive-points was used to collect cost-effective data regarding the interaction of surface water and groundwater in remote areas. These data were instrumental in refining the conceptual model. An integrated hydrogeologic model was then prepared using MODFLOW-SURFACT to assess and forecast potential groundwater/surface water interactions particularly following construction of the landfill. Results of the study indicate that there is close interaction between surface water and groundwater with subsurface flow generally paralleling local surface water drainages. Hydraulic testing, groundwater modeling, groundwater sampling and analysis, and stream hydrographs indicate that the groundwater resources in this part of Guam are not suitable for large-scale water supply development.
| Anthony D. Daus , AMEC Environment & Infrastructure, Inc. | |
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Tony Daus is an environmental industry veteran with more than 28 years of experience. He obtained a B.S. in Geology from the University of Missouri and later enrolled at the University of Waterloo for graduate work. He has managed or supported many national and international projects including one of the largest soil and groundwater investigation and remediation projects in Brazil. In addition, Daus has served as a reviewer for several technical journals, including Groundwater and the Journal of Environmental Science Health He is currently serving as Executive Vice President of AMEC Environment & Infrastructure. |
| Kate E. Richards, PG , AMEC | |
| Kate Richards has seven years of experience in analysis of hydrogeologic data and groundwater modeling. Her data analysis and numerical modeling experience includes assessing injection zones, capture zones, contaminant release scenarios, remediation alternatives, dewatering alternatives, stream and wetland depletion, and fate and transport of contaminants. Richards holds an M.S. in Hydrology from the New Mexico Institute of Mining and Technology, and a B.S in Environmental and Engineering Geology from Western Washington University. She is a registered Professional Geologist in California. | |
