SECOND AMENDMENT TO AGREEMENT FOR THE PURCHASE
OF ALL THE SHARES OF CAPITAL STOCK
OF COLLINS CONSTRUCTION, INC.
THIS SECOND AMENDMENT TO AGREEMENT FOR THE PURCHASE OF ALL THE
SHARES OF CAPITAL STOCK OF COLLINS CONSTRUCTION, INC. ("Second Amendment") is made
and entered into by and between COLLINS CONSTRUCTION, INC. a Colorado corporation ("Collins").
FRANK W. COLLINS and JOSHUA GOODSELL ("Sellers") and GEOBIO ENERGY, INC., a publicly-
traded Colorado corporation ("Purchaser"). WITNESSETH:
WHEREAS. the parties entered into that certain Agreement for the Purchase of All the Shares of Capital
Stock of Collins Construction, Inc., having an effective date of March 31, 20 [0 as amended by the First
Amendment to Agreement for the Purchase of All the Shares of Capital Stock of Collins Construction, Inc. dated
June I, 2010 (the "Purchase Agreement"); and
WHEREAS, in accordance with the First Amendment to the Purchase Agreement. Purchaser elected to
extend the Closing Date until July 16, 2010; and
WHEREAS, the parties are desirous of further extending Closing as set forth below.
NOW, THEREFORE, in consideration of the mutual promises, covenants and conditions combined
herein, the parties hereto agree to amend the Purchase Agreement as follows:
L Closing will take place on Or before September 15, 2010.
2. All other terms, conditions and provisions of the Purchase Agreement shall remain the same and in full
force and effect. In the event of any conflict between the Purchase Agreement and this Second Amendment, the
terms and conditions of this Second Amendment shall control.
This document may be executed in various counterparts, and when all parties have executed n copy
hereof, the executed copies taken together shall be deemed to be the full and complete agreement of the parties..
The signature of any party transmitted electronically shall be deemed as valid and binding as an original
[Signatures follow on next p