COLOG’s HydroPhysical™ (HpL) logging is available for evaluating interval specific distribution of permeability and water quality. Utilizing deionized water, borehole fluids are diluted while changes are monitored in fluid electrical conductivity (FEC) and temperature. The entire aquifer can be tested as one working unit allowing for sensitive and accurate assessments during both stressed (pumping) and non-stressed (ambient) conditions in either open or completed wells.