  In this paper we derive local estimates of solutions of the Perturbed Stokes
system. This system arises as a reduction of the Stokes system near a curved
part of the boundary of the domain if one applies a diffeomorphism flatting the
boundary. The estimates obtained in the paper play the crucial role in the
investigation of partial regularity of weak solutions to the Navier-Stokes
system near a curved part of the boundary of the domain.
