Example: could I take 4 pyramid deck blocks and cover with 2x12 pressure treated on edge, pour gravel in that and cover with 2x12, this then would be a solid platform for mounting the outlet. Alternately 6x6's tied together. Harder to work with 6x6 as stores can't cut.
This is because I can't dig down in this area due to soil compaction and multiple utility lines underneath.
314.23 Supports. (B) Structural Mounting. An enclosure supported from a structural member of a building or from grade shall be rigidly supported either directly or by using a metal, polymeric, or wood brace.
(2) Braces. Metal braces shall be protected against corrosion and formed from metal that is not less than 0.51 mm (0.020 in.) thick uncoated. Wood braces shall have a cross section not less than nominal 25 mm × 50 mm (1 in. × 2 in.). Wood braces in wet locations shall be treated for the conditions. Polymeric braces shall be identified as being suitable for the use.
What NEC requirements apply to installing receptacle next to a tree?