Pond ash, which is the burnt by-product of fossil fuels such as coal and lignite, is increasing due to globalization, and the safe disposal of pond ash has become a challenging task for human society; the dumping of pond ash in a particular area makes the chosen area too vulnerable for any living kind. The retention of pond ash for a prolonged period leads to soil contamination and infertility of the soil. To overcome the issue, the accumulation of pond ash as a part of the road subgrade shall considerably reduce the dumping. The Pond ash contains both fly ash and bottom ash in a proportion that may vary as per age of dumping. Both fly ash and bottom ashes are rich in cementitious and silicious properties. When the pond ash is mixed with milling waste (Reclaimed Asphalt Pavement) and flue-gas desulfurization material with a particular mix proportion, it leads to matrix material, which becomes a more idealized material for usage as road sub-grade stabilization. Pond ash and flue-gas desulfurization materials make up a key proportion of wet mix macadam material. The milling waste (Reclaimed Asphalt Pavement), on the other hand, is the actual top layer of any road pavement in the form of rubbles and has the added advantage of a cohesive and additive nature. The selection of mix proportions for optimum content makes the matrix mix much espouse as a sub-base course that can readily disperse the tearing action of road surfaces due to differential loading of wheels, which leads to potholes over the lane over time. The California bearing ratio (CBR) test is done to find the optimum mix.