Gas Station Forecourt Runoff Interceptor

Forecourt Runoff Carries Hydrocarbon Contamination

Every fuel forecourt, gas stations, transport refuelling depots, fleet fuel terminals, generates stormwater runoff that carries petroleum hydrocarbons: fuel spilled during refuelling, leakage from underground tank fittings and vapour recovery hardware, vehicle drips from idling vehicles, and weather event flushing that mobilises accumulated residue. Direct discharge to the municipal sewer or stormwater system fails the regulator consent on petroleum hydrocarbons and contaminates the receiving water body.

Buried CPI Interceptor Configuration

The SorbiTech forecourt interceptor is a buried concrete CPI oil water separator installed beneath the forecourt canopy footprint with manhole access for service. The CPI plate pack delivers outlet below 30 mg/L oil; the integrated sludge hopper collects the settled solids; the oil skim chamber holds the recovered hydrocarbon for licensed off site disposal.

Storm Event Sizing

The interceptor is sized for the design storm event under the regional drainage regulations (typically a 1 in 5 year or 1 in 10 year return period storm). An inlet trap and an outlet flow restrictor manage the storm peak by storing excess runoff temporarily and controlling the discharge rate. The sizing study accounts for the canopy area, the forecourt drainage area, and the design storm intensity.

Service Contract and Regulatory Documentation

Scheduled service every 6 to 12 months covers sludge pump out, oil decant for licensed off site disposal, and inspection of the inlet trap and outlet restrictor. The SorbiTech service contract maintains the operator regulatory documentation: discharge sampling records, chain of custody for the recovered hydrocarbon, and the asset register for the regional environment regulator. Sector coverage is vehicle services and transport.