THE PURPOSE OF OUR PROPOSED WORK EFFORT IS TO TEST THE HYPOTHESIS THAT IN SITU SEGREGATION AND RESULTANT FROST HEAVE HAVE CONTRIBUTED SUBSTANTIALLY TO OBSERVED EXCESS ICE IN THE UPPER METER OF THE MARTIAN REGOLITH. WE WILL FOCUS ON NUMERICAL SIMULATIONS OF THE DEVELOPMENT OF ICE LENSES WITH THE GOAL OF ESTIMATING THE VOLUME OF EXCESS ICE THAT CAN BE PRODUCED IN THIS FORM DURING THE PAST 1-4 MA OF MARTIAN HISTORY IN TWO SPECIFIC REGIONS WHERE THE ORIGIN OF EXCESS ICE IS DEBATED: THE PHOENIX LANDING SITE AND MID-LATITUDE FRESH CRATER SITES IN UTOPIA PLANITIA. OBSERVATIONS OF EXCESS ICE IN THESE LOCATIONS ARE DISTINCT FROM ONE ANOTHER. ASSESSING THE CONTRIBUTION OF FROST HEAVE AT EACH LOCATION WILL SHED LIGHT ON THE RELATIVE IMPORTANCE OF ALL THREE HYPOTHESES FOR EXCESS ICE PRODUCTION IN DIFFERENT GEOGRAPHIC REGIONS OF MARS.