DOT Highway & Roadway Infrastructure Spec Soil Capping Matrix
in Washington

Diverse topography and massive annual rain demand adaptable erosion control. You must lay robust drainage and geogrid reinforcement to stabilize glacial till subsoil. Spray flexible growth mediums (FGM) mixed with deep-rooted native seed to stabilize slopes and stop sediment from dumping into critical watersheds.

Operational Constraints for DOT Highway Expansion

Highway expansions and road widenings expose massive, continuous steep slopes directly adjacent to active traffic. The constant wind shear from passing heavy commercial vehicles and earth-moving equipment vibration degrade weak agricultural tackifiers long before vegetation can establish. Furthermore, contractors must apply the matrix across extended linear distances, requiring a slurry that sprays efficiently from the cannon without cavitating the hydroseeder pump. You need an engineered binder that provides extreme shear resistance to protect the embankment, prevent subgrade failure, and keep the roadway clear of sediment runoff.

Meeting WSDOT Standard Specifications for Road, Bridge, and Municipal Construction, Section 8-01 (Erosion Control) Specifications

OHRA ViscoLok anchors seed and mulch directly to the subsoil, providing the rain-fast shear strength required by WSDOT Standard Specifications for Road, Bridge, and Municipal Construction, Section 8-01 (Erosion Control). Its microplastic-free botanical hydrocolloid network forms a 3D matrix. It resists high-velocity storm runoff and keeps synthetic toxins out of the watershed.

The matrix prevents "fisheye" lumping inside your hydroseeder pump. This stops pump cavitation and reduces friction head loss. You maximize your tank's spray payload and eliminate constant agitation adjustments on the job site.