Paragraph 18 Storage of oils, fuels, concrete and chemicalsI1

Any facilities for the storage of oils, fuels, concrete or chemicals must be sited on an impervious base that must either be graded to drain to a sump or collector or surrounded by impervious walls to form a bunded compound. The volume of the bunded compound must be at least equivalent to the capacity of the tank plus 10%. All filling points, vents, gauges and sight glasses must be located within the bund. The drainage system of the bund must be sealed with no discharge to any watercourse, land or underground strata. Associated pipe work must be located above ground and protected from accidental damage. All filling points and tank overflow pipe outlets must be designed to discharge into the bund. All works and facilities as referred to in this condition must be constructed and completed prior to the first use of the facilities and must thereafter be retained.