David G. Harwood, PG

David G. Harwood, PG Senior Hydrogeologist

Dave Harwood is an expert in new water supply well development, permitting, and water modeling. He is well versed in planning test well investigations through interpretation of published geologic maps, evaluation of test well logs and geologic cross-sections, well site selection, pumping test design, implementation and data analysis which includes determination of aquifer properties, well safe yield and environmental impact to wetlands, streamflow and other surface water bodies.

The contribution zones of the production wells are delineated using complex numerical modeling (MODFLOW) which account for spatial variability of aquifer properties, groundwater-surface water interaction through wetlands, streams and ponds and variable precipitation recharge. Most of these projects included design of the final production wells with yields from 0.5 to 1.5 million gallons per day. The permitting process is highly regulated and undergoes rigorous review by several regulatory agencies and environmental groups and can often take several years to complete.

Dave also has considerable experience completing hydrogeologic investigations related to solid waste and wastewater disposal permitting. These projects include planning and supervising boring programs and preparation and interpretation of geologic cross-sections. These projects also include planning, executing and interpretation of data from slug tests to evaluate hydraulic conductivity and interpretation of groundwater level measurements for evaluation of groundwater flow and monitoring well siting. Wastewater disposal projects primarily focus on two aspects of hydrogeologic suitability of the site: determination of seasonal high water table elevation and prediction of groundwater mounding. Groundwater mounding is determined either through a complex analytical solution or modeled through numerical methods (MODFLOW). MODFLOW is also used to calculate groundwater travel time when the wastewater disposal is in a Zone II.

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