My ~4 year old foundation developed small cracks that let in small
amounts of water during really heavy periods of rain. The builder
sent his sub that does epoxy injection to inject 4 cracks. He put
some ports on the wall, sealed the crack with something and injected
them. He came back a couple of days later and removed the ports. 3
out of the 4 still leaked with the heavy rains this year. Everyone I
talked to previous to allowing the sub to do the work said that epoxy
injection works. So I have to assume it was the sub not doing it
properly. My question is, what can be done now? Can they be
reinjected? Unfortunately, I believed everyone that said it would be
fixed and went ahead and built my deck over one of the cracks. I was
thinking of digging it out on the outside and fixing but everyone said
don't bother. I can't get to it now.

Thanks