Located in Garden Grove, Calif., Special Inspection Services has been in operation since 1995. It provides materials testing and deputy inspection services for Southern California construction projects. The firm functions as an association between building owners and city inspectors. Its tests performed comply with American Society for Testing and Materials (ASTM) standards. The firm's list of clients include Gluck Construction, California Institute of Technology, Warner Constructors, Forest City Development, McCarthy Construction and Archstone Smith, to name a few.