His range is not wide enough that you have 70% equity. Re-evaluate the hands he can be raising you on the river with here and keep in mind the ranges you put him on for flop and turn, cause they aren't going to get wider on the river. Sort of a f(g(x)) thing where the domain of f o g is restricted by the domain of g(x).

He's definetly not doing this w any pair or broadway.