(a) Storage tanks on premises from which gasoline or diesel motor fuels are drawn and sold or offered for sale, at retail, for use in motor vehicles shall be checked daily by the operators of the premises for water content. Such test should always be made at a reasonable time after a truck delivery of the product and may be considered as complying with the once-a-day requirement. If one or more inches of water are present in any of the tanks, the operators shall cease dispensing gasoline or diesel oil from those pumps drawing from these storage tanks and shall take immediate steps to remove the water from these storage tanks.
(b) It shall be a violation of these rules and regulations to sell, offer for sale or have available for sale, at retail, for use in a motor vehicle, gasoline or diesel motor fuel from a storage tank, which, on test, is shown to have two or more inches of water.
(c) No operator of service station selling or offering for sale gasoline or diesel motor oil, at retail, for use in a motor vehicle, shall use or allow the use of a dispensing pump which draws gasoline or diesel oil from a storage tank into which a truck is delivering either of these petroleum products.