An evaluation by an outside company found several flaws with the first public appraisal conducted on a house in Gordon Plaza, a New Orleans neighborhood built on top of toxic soil.A letter by ARC Appraisers provided an overview of possible problems within the appraisal based on federal and state standards. Chris Baker, the company’s chief appraiser, clarified that the letter didn’t serve as an official review of the report, which requires more scrutiny.