Water, Drainage and electric shopuld pass over the top of the strip foundaton but still be bellow ground level. The pipes should be sleved when they pass through the underbuild and a suitable size lintel used above. The main gas supply upto the meter should rise externally and in new build the meter is usually at ground level. A feed is then taken from the meter to the boiler. All gas pipes that are enclosed in a duct must be vented.