I need to run power to a well via underground conduit, however there are two impediments to this run: a swale and an underground service feeder. The new conduit run will intersect both these are right angles (see below, blue is swale, gray is service feeder, black arrow is proposed circuit). Looking for advice on how to do this safely and effectively.

For the swale portion, it should be shallow enough that the PVC conduit can handle the gentle grade down and up, and the swale is dry this time of year, however it will likely have 1-2 feet of water in normal conditions most of the year. The problems I can see with this are the extra weight of the water and erosion. Could just packing some loose rocks on top of the conduit before re-burying be sufficient, assuming I do the calculations to make sure the conduit can bear the weight?
For the service feeder, I want to stay clear of it. Even though I know 811 will get me approximate location, they won't give me depth. My thought was to pour a concrete slab over the location where the new circuit would intersect the service, and bring the new conduit above ground so it can cross over it that way (see below). Then no safety concerns with digging near service conductors. Not sure about the impact of weight of the concrete on the service though; the concrete wouldn't be structural, so it wouldn't need to be thick.

If anyone has experience dealing with these sorts of obstacles to underground conduit runs, I'd appreciate feedback and suggestions.

For the swale portion, it should be shallow enough that the PVC conduit can handle the gentle grade down and up, and the swale is dry this time of year, however it will likely have 1-2 feet of water in normal conditions most of the year. The problems I can see with this are the extra weight of the water and erosion. Could just packing some loose rocks on top of the conduit before re-burying be sufficient, assuming I do the calculations to make sure the conduit can bear the weight?
For the service feeder, I want to stay clear of it. Even though I know 811 will get me approximate location, they won't give me depth. My thought was to pour a concrete slab over the location where the new circuit would intersect the service, and bring the new conduit above ground so it can cross over it that way (see below). Then no safety concerns with digging near service conductors. Not sure about the impact of weight of the concrete on the service though; the concrete wouldn't be structural, so it wouldn't need to be thick.

If anyone has experience dealing with these sorts of obstacles to underground conduit runs, I'd appreciate feedback and suggestions.