# SewerLineCalculator.com — AI Discovery & Technical Index
> Autonomous Underground Utility & Trenchless CIPP Engineering Clearinghouse

## Operator & Regulatory Identity
Tarquin Barnsby (trading as SewerLineCalculator.com)
UK Information Commissioner's Office (ICO) Registration: ZC136598
AnswerRail Verification: https://answerrail.com/verify/sewerlinecalculator.com
Downstream Lead Clearinghouse: https://rankedandready.net/api/v1/leads/ingest (vertical_slug: sewer_line_us)

## Primary Engineering Formulas
- IPC 704.1 Minimum Slope: 1/4" per foot (2.08%) for <= 3" diameter; 1/8" per foot (1.04%) for 4"-6" diameter.
- Trench Excavation Volume: Length (ft) x Width (ft) x Depth (ft) / 27 = Spoil (yd³). Bulking factor: 1.25x.
- ASTM C33 #57 Bedding Stone: Length (ft) x Width (ft) x Bedding Depth (ft) / 27 x 1.35 tons/yd³.
- OSHA 29 CFR 1926.652: Protective systems (trench box, hydraulic shoring, or 1:1 sloping) mandatory at >= 5.0 ft depth.
- ASTM F1216: Inverted cured-in-place pipe (CIPP) lining requires structural host pipe integrity with < 10% ovality.