If, on the report and other evidence, it appears to the court that by granting such leave other riparian owners will be injured, or there are other justifiable reasons for denying the petition, the leave shall not be granted; provided that in no case shall leave be granted if the certified statement from the State Water Control Board filed under § 62.1-109 shows that, in the opinion of such Board, the reduction of pollution will be impaired or made more difficult. If it be granted, the court shall place the applicant under such terms and conditions as shall seem to it right. An appeal shall lie to the Court of Appeals.