Ground Water Science provided complete supervision of a test drilling, aquifer yield analysis and well siting program in the deeper of two glacial outwash sand-and-gravel aquifer units. Capacity for 1000-gpm wells in the VOC-free zone was identified at two sites and the site geologic profile updated. A new 1000-gpm well has been constructed and tested, and placed in service. A maintenance plan to prevent loss of production due to iron biofouling was drafted for facility implementation. A changing well environment (going to an iron sulfide condition) tested the plan and resulted in the need for recommending changes in the cleaning program and equipment to meet the new conditions in cooperation with the well contractor.