in_situ_trench_dimensionsGeometric Boundary Interval (Length × Width × Depth)
Excavation trench length, width, diameter, and uniform depth defining total uncompacted spatial volume prior to material placement. Standard depth benchmarks: 2–3 inches for decorative landscape mulch, 4 inches for pedestrian walkways and shed pads, and 6–8 inches for heavy-load vehicular driveways.
Default: 40 ft × 20 ft × 4 in (9.88 yd³)
aggregate_bulk_densityVolumetric Mass Ratio (Tons per Cubic Yard)
Dry loose unit mass per volume, ranging from 1.30 to 1.40 tons/yd³ (2,600–2,800 lbs/yd³) for dry masonry sand, 1.40 to 1.48 tons/yd³ (2,800–2,960 lbs/yd³) for #57 crushed limestone, up to 1.60 to 1.65 tons/yd³ (3,200–3,300 lbs/yd³) for densely graded crusher run base.
Default: 1.45 tons/yd³ (2,900 lbs/yd³)
compaction_settlement_factorMechanical Consolidation Ratio (%)
Percentage reduction in aggregate thickness under vibratory plate tampers or heavy tandem rollers. Dense-graded road base (crusher run / ABC) consolidates 15% to 22% as fine dust fills voids, whereas washed open-graded angular stone (#57) settles only 5% to 8%.
Default: 10% to 15%
grading_wastage_contingencySubgrade Irregularity Buffer (%)
Site allowance buffering uneven subgrade excavation, wheel rutting, boundary spillover, and mechanical handling losses. Standard allowances: 5% for rigid concrete-curbed forms, 10% for uniform flat driveways, and 15% to 20% for irregular, soft, or sloping terrain.
Default: 10%
hauling_payload_ratingLegal Highway Axle Load Limit (Tons)
Maximum legal net material payload per hauling cycle permitted under highway bridge-formula weight limits: Single-axle dump (5–6 tons / ~4 yd³), Tandem dump (10–12 tons / ~8 yd³), Tri-axle commercial hauler (15–18 tons / ~12 yd³), and End-dump semi-trailer (22–25 tons / ~16 yd³).
Default: 16 Short Tons (Tri-Axle)
