We appreciate this opportunity to be of service to you. If you should have any questions, please contact
               our office.
               Respectfully,
               FROEHLING & ROBERTSON, INC.
               James E. Andrews, P.E.
               CMT Manager
             Vexcon Chemicals, Inc.                                                      Certi-Vex Penseal 244-100%
             75P0343                                          2                                          11/3/15