Poured surfaces in South El Monte fail when placed directly on native alluvial sand. Lasting flatwork here requires excavated subgrade, compacted aggregate, and rebar reinforcement.
South El Monte occupies the low alluvial plain between the San Gabriel River and the Rio Hondo channel. The ground beneath local neighborhoods consists of unconsolidated sand, fine silt, and river sediment laid down over centuries. When wet winter storms sweep the San Gabriel Valley, moisture pools in this loose earth. Untreated native soil loses bearing capacity beneath vehicle weight, which causes unsupported four inch concrete slabs to fracture along traffic paths.
To counter this ground movement, Pasadena Concrete Co strips out four inches of weak silt before placing any formwork. We roll down crushed aggregate base, vibrating it to high density before placing grade 60 steel rebar on chairs. Wes Hollister directs our crews to maintain concrete thickness across the entire pour rather than tapering at the edges. This structural subbase spreads wheel loads across the soil, keeping driveways level through wet winters.