Hazardous substances consent (HSC) HSCs are regulated by the Planning (Hazardous Substances) Act 1990 (P(HS)A 1990), the Planning (Hazardous Substances) Regulations 2015 (PHSR 2015), SI 2015/627 (in England) and the Planning (Hazardous Substances) (Wales) Regulations 2015 (PHSWR 2015), SI 2015/1597 (in Wales). HSC is needed if specified hazardous substances (or mixtures or preparations of substances) are to be stored or used at a hazardous installation above specified controlled quantities. The substances for which and thresholds above which HSC is required are set out in the PHSR 2015, SI 2015/627, Sch 1 or PHSWR 2015, SI 2015/1597, Sch 1. Whether the storage of large quantities of vehicles require hazardous substance consent depends on: • whether the fuel tanks contain hazardous substances • if the fuel tanks do contain hazardous substances, the amount of hazardous substance • whether an exemption applies PHSR 2015, SI 2015/627, Sch 1 Pt 2,