Interceptor and gully records for depot yards

20 October 2026

Walk across most depot yards and you will pass gullies, channel drains, an interceptor near the fuel island and perhaps an attenuation tank under the parking area. Ask which is which on the drainage plan, and the answer is often a shrug. The assets are there; the records that connect them are not.

Give every asset a name

The most useful thing a yard can have is a drainage plan with a reference for every gully, chamber, interceptor and tank. The references do not need to be clever. They need to be marked on site, shown on the plan and used by everyone who books or carries out work. Once that exists, every visit can be recorded against a named asset rather than "yard drains". A plan that exists only as a scanned drawing in an old email is not enough: keep the current version in the site folder and date it.

What each visit should leave behind

• a service sheet naming the assets cleaned or inspected
• the condition found, including silt or oil levels where they were measured
• any section that could not be reached or properly viewed
• the waste transfer note for recovered material, or a consignment note where the waste is hazardous, as interceptor waste can be
• photographs of chambers before and after

The work covered by Industrial Drain Cleaning includes deposit recovery, interceptor and gully cleaning, flow checks and further investigation. Those activities produce different kinds of records. A sheet confirming that silt was removed is not the same as evidence that the pipe was inspected throughout its length. Ask for the work actually completed to be recorded, along with anything left inaccessible. Otherwise, someone opening the file next year may mistake a routine clean for a full inspection.

Reading the records together

Kept against named assets, service sheets begin to show patterns. A gully that silts quickly may sit below an unswept loading area. An interceptor that needs frequent emptying may be taking more than it was designed for, perhaps from a wash bay added after the yard was built. Those are questions for a drainage investigation, and the records are what raise them.

Storing it

Keep one folder per site with the drainage plan at the top, and inside it a folder per asset holding its service history. Waste paperwork can live in a separate waste folder as long as each note is cross-referenced to the asset it came from. Scan paper sheets on the day and keep the folder backed up. If the business ever needs to show how its yard drainage is managed, to a landlord, an insurer or a regulator, the evidence is ready without a hunt through old invoices.