The purpose of sections 256D.33 to 256D.54 is to (1) provide a sound administrative structure for public assistance programs; (2) maximize the use of federal funds for public assistance purposes; and (3) provide an integrated public assistance program for all Minnesota residents who are recipients of Supplemental Security Income or who, except for excess income, would be receiving Supplemental Security Income and who are found to have maintenance needs as determined by application of state standards of assistance according to section 256D.44.