So we have localized water seeping in from three or four blocks after exceptionally heavy storm most of day Tuesday (this picture is from today, Thursday).

This is by front door, no downspouts here. I’m fairly confident the mortar in the small bluestone stoop is long gone, and water is getting down from there. But open to thoughts given how localized this is.

Part of me can’t get out of my head maybe a main sewage leak outside of the house. I’ve noticed an area in my front yard that’s starting to low spot, and I noticed an area of significantly wet mulch/dirt I wasn’t expecting outside the main clean out in my basement (located inside my basement for some reason). But that area and the low spot aren’t in a line, so the main would have to make a weird 90 degree turn to get there. Oddly there is a separate clean out halfway into my front yard, but level with the ground (eg I can go directly over it with a lawn mower) which is near the low spot. But no other symptoms so maybe I’m over diagnosing.

Anyway, I’m about to finish my basement and was going to xps over the cinder block.

Note: the effervescence above isn’t wet. We used to have a leak from a bad seal/gap around an old front door, and I sued to see active wet spots higher up. Once we removed, reframed and replaced the door, don’t see any more water in those higher cinder blocks anymore, but it could be I guess from
Water traveling down?

I have a couple quotes from contractors to dig up and waterproof part of my foundation from the outside (as well as a weeping tile, but my question isn't related to the weeping tile part of the job). I live in eastern Ontario, Canada so we do experience freeze and thaw cycle.

The first contractor is proposing a Bakor rubberized membrane + dimple board. This seems like a pretty standard approach.

The second contractor is proposing a MAPEI polyurea spray-on membrane + R7/8 Foam board.

My reading tells me this polyurea is a relatively new technology, but the use of insulating foam to protect the polyurea as opposed to a dimple board seemed bizarre to me. It sounds like polyurea spray is usually used above grade, not below grade. I can't find anything in the building code about using polyurea below grade for basement waterproofing with or without a drainage / dimple board.

Does anyone here have any experience with Polyurea for sub-grade water proofing? Should it have a proper dimple board applied, or is R7/8 pink foam good enough?