Welfare and Institutions Code Section 366.22, subdivision (a), provides in relevant part: "After considering the admissible and relevant evidence, the court shall order the return of the child to the physical custody of his or her parent or legal guardian unless the court finds, by a preponderance of the evidence, that the return of the child to his or her parent or legal guardian would create a substantial risk of detriment to the safety, protection, or physical or emotional well-being of the child. The social worker shall have the burden of establishing that detriment." "Appellate justices review a respondent court's decision after a section 366.22 ruling as follows: 'Evidence sufficient to support the court's finding "must be 'reasonable in nature, credible, and of solid value; it must actually be "substantial" proof of the essentials which the law requires in a particular case.'" "Where a discretionary power is inherently or by express statute vested in the trial judge, his or her exercise of that wide discretion must not be disturbed on appeal except on a showing that the court exercised its discretion in an arbitrary, capricious or patently absurd manner that resulted in a manifest miscarriage of justice. " ' In the presence of substantial evidence, appellate justices are without the power to reweigh conflicting evidence and alter a dependency court determination. " (Constance K. v. Superior Court (1998) 61 Cal.App.4th 689, 705 (Constance K.).)