Can Class A and Class B storage tanks be located in the same tank farm, divided into two groups, with one group buried and the other above ground?

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There is currently a project to renovate a tank area, and the situation is quite challenging due to insufficient space. The details are as follows: there are originally 2 horizontal storage tanks for liquid ammonia, each with a capacity of 10 cubic meters, and 1 horizontal storage tank for methanol with a capacity of 50 cubic meters； A new methanol storage tank with a capacity of 50 cubic meters is now to be added. The distance between this new methanol storage tank and the pump room sowie the surrounding buildings is less than what is required by the regulations. Considering that for buried horizontal storage tanks with a capacity of 50 cubic meters or less, the required distance from surrounding buildings is reduced by half, one idea is to leave the existing liquid ammonia storage tank in place and bury the two methanol storage tanks. Can it be considered in terms of two tank groups within one tank area? Furthermore, can the spacing between these two tank groups be determined in accordance with Article 4.2.3.3 of the building codes, which states that \"the fire separation distance between tank groups should be determined based on the type of tanks within the group and by converting them into standard single tanks of the same category, in accordance with the provisions of Article 4.2.2 of these codes\"? If possible, the total volume of the liquid ammonia storage tank group should be 20 cubic meters, while the total volume of the methanol storage tank group should be 100 cubic meters; both types of tanks are horizontal-type. The minimum distance required between them is 0.8 meters. In other words, the horizontal distance between adjacent liquid ammonia tanks and methanol tanks (which are buried) needs to be greater than 0.8 meters?