straight forward health and safty advice 
All substances including chemicals, solvents and fuel should be stored in a specially selected and locked areas Store like substances together and away from other groups of substances that might cause a reaction if mixed; and store oxidizing and flammable substances in separate locations.  This is to prevent the inadvertent mixing of incompatible chemicals, which can produce harmful gases and/or vapours, heat, fire and explosions. Do not store substances higher than eye level, and never on the top shelf of a storage unit; and avoid storing them on the floor (even temporary); and follow these basic precautions to control the potential risks:Chemical storage area store substances according to the manufacturer's instructions on the safety data sheet; keeping the minimum quantity of hazardous substances necessary; store incompatible substances separately; take steps to prevent the release or leakage of dangerous substances; keeping a spill kit near to the storage areas, and make sure people know what to do in the event of a spill; clean up any leaks or spills that occur; use appropriate precautions when handling substances - for example, wearing protective clothing or by ensuring adequate ventilation; check that containers used for short-term storage are properly labelled. Allocate safe storage areas for the storage of flammable materials and gases; and make sure that warning signs are displayed, so that everyone is aware of the risk that they pose. Keep: flammable materials like petrol, solvents and adhesives in lockable steel containers; and flammable gases, upright on their base and stored outside buildings; in well- ventilated and secure areas, such as wire mesh cages. Any tank used  for the bulk storage of fuel must have a bund around it, which will hold the contents of the tank plus 10%, so that any leakage from it is contained.