Dick, From looking at the pictures of the facilities, I have some other comments which all comes under the heading "facility siting". Facility siting involves how a facility is arranged to do the intended job but also arranged such that if a contingency (hazardous material release, flash fire, explosion, etc.) were to happen, the damage would (hopefully) be limitied and effective response and recovery operation undertaken.
With this in mind, do NOT put your loadout tankage right next to the tracks and the loadout racks. They need to be set back from the load point(s). The reason is that if a contingency, such as a fire, were to happen with the tankage then any equipment, tank cars, etc., could be involved if they are situated too close the tankage. Same for any building not related directly with the tankage. Of course, a pump building for unloading could be somewhat closer but maybe not right next the tanks. In any event, the building would not be placed inside any secondary containment structure. Also, note the office type buildings next to the "refinery" equipment. That also is not good practice. Again, any contingency with the equipment could put personnel in the buildings in danger.
Inherently dangerous equipment, such as equipment with open flames like fired heaters or boilers, are always located a minimum distance (usually 150 feet or 50m) from other equipment and buildings. See my placement of the fired heaters for the stabilizer in my Asset Route. Also, you need to add an Emergency Shutdown station at the bottom of the stairs to the load rack and another one away from the load rack or facility so that the entire operation can be shutdown should a contingency take place. You can use my ESD station: <KUID2:417385:101760:1>
If you look at my Asset Route, you will note that I did not put a secondary containment berm around any of the Natural Gas Liquids (NGL) tanks. That's because any leak from these tanks will readily vaporize into the atmosphere and not collect on the ground. Not that an NGL leak is not dangerous; it is but a containment berm will not mitigate the danger.
Right before I retired, I did a rather large study, involving several of our facilities, that dealt with contigency operations and where the "on-scene command site" should be located. There was a concern that response personnel were setting the command spot too close to the incident location and exposing themselves to possible injury. Long story short; I used a series of steps, including equating various sized natural gas, methane, propane, etc., leaks to certain sized charges of TNT and the atmospheric overpressure that sized explosion would produce over varing distances to estimate the distance personnel should be. I used, for this study, a maximum of 0.5 psi overpressure as the minimum distance as that is the approximate atmospheric overpressure that will rupture a persons eardrums. However. one really interesting fallout of the study was the realization that the control room/office building at one facility was way too close a process area that had the potential of a propane gas leak. The company, because of this study, ended up moving the control room and office at a cost of many millions of dollars. Don't ask why this type of study hadn't been done before the plant was built because I can't answer.
And, yes, I would also like to see your completed loading facility. I promise to not be too critical.
Take care.