Pomona's development from a railroad town to a growing inland city left a patchwork of cut-and-fill lots across the foothills. Every retaining wall here has to contend with that history. Older neighborhoods near Ganesha Hills sit on decomposed granite that shifts with winter rains. Flatter areas toward the 71 Freeway deal with alluvial deposits that drain poorly. These contrasts make generic wall designs a gamble. Our geotechnical team runs the subsurface investigation first. We extract soil samples, measure shear strength, and calculate lateral earth pressures specific to your Pomona site. The result is a wall section that matches real ground conditions. No oversized sections that waste budget. No undersized walls that lean after the first wet season. For deeper cuts where compaction control matters, we often pair the retaining wall scope with a plate load test to verify the bearing capacity of backfill lifts before wall construction begins.
A retaining wall is only as stable as the soil it rests on. In Pomona's weathered shale and sandstone, subgrade preparation dictates wall performance more than the block strength ever will.
