Paragraph 28 Drainage: oil interceptorI1

Surface water drainage from impermeable parking areas and hard standing for vehicles and lorry parks must be passed through oil interceptors prior to being discharged into any watercourse, surface water sewer or soakaway system. The oil interceptors must have a sufficient capacity for the areas being drained and must be constructed prior to the first use of the parking areas or hard standings and must thereafter be retained. Roof water must not pass through the oil interceptors.