Document:

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                                                                   Exhibit 10.12

                                 Lease Agreement
                               Advanced BioEnergy
                         Mueller / Biegert Office Rental
                                  June 2, 2005

This is a Lease Agreement made this 2nd day of June, 2005 by and between
Advanced BioEnergy (Leasee) and Mueller / Biegert Office Rental (Leasor)

This hereby notifies and indicates acceptance by the above parties of the
following:

     1)   The Leasor hereby rents to the Leasee, the office property at 137 N
          8th Street, Geneva, NE 68361 to be occupied solely as office space by
          the Leasee listed above. Monthly rent during this agreement is $700
          and a refundable security deposit of $700 is also required. The
          security deposit will be returned after the inspection of the property
          and payment of all outstanding bills. Leasee is responsible for all
          utilities.

     2)   This agreement runs from the 1st day of July, 2005 up to and including
          the 31st day of December 2006. (18 months)

     3)   Monthly rent is due on the 1st of each month. Late fees will be
          assessed if this policy is abused. A $15 fee will be charged on all
          returned checks

     4)   Leasehold Improvements: The Leasor agrees to paint, install new
          carpet, lighting, ceiling tiles, and remodel bathrooms and interior
          walls as agreed upon with Leasee. The Leasor shall pay the first $5000
          of actual costs of improvements and the Leasee shall pay the balance
          above stated amount. All improvements and costs will be agreed upon by
          both parties

     5)   Leasee shall be responsible for its employees and guests at all times.
          Leasee and guests shall not allow or permit any improper or illegal
          conduct on the premises

     6)   Leasee shall notify the Leasor promptly of any malfunctioning smoke
          detectors, electrical and plumbing facilities, broken windows, or
          presence of pests in order for the situation to be remedied. The
          Leasor will make Service calls if needed.

     7)   The Leasor shall return the refundable security deposit or any portion
          thereof only after lawful termination of tenancy, receipt of the
          Leasee's new address, and satisfactory cleaning of the premises. The
          security deposit may not be used for the last month's rent.

     8)   Failure to abide by the terms of any of the aforementioned provisions
          is a violation under this agreement.

Advanced BioEnergy

/s/ Revis L. Stephenson III                  6/2/05
---------------------------------            ------
Revis L. Stephenson III, Chairman            Date

Mueller / Biegert Office Rental

/s/R.R. Mueller                              6-4-05
---------------------------------            ------
Rich Mueller                                 Date<Page>

                                                                   Exhibit 10.13

              AGREEMENT BETWEEN OWNER AND HDR ENGINEERING, INC. FOR
                              PROFESSIONAL SERVICES

THIS AGREEMENT is made as of this 15 day of June, 200__, between ADVANCED BIO
ENERGY, FAIRMONT, NEBRASKA ("OWNER") and HDR ENGINEERING, INC., ("ENGINEER") a
Nebraska corporation, with principal offices at 8404 Indian Hills Drive, Omaha,
Nebraska, 68114 for services in connection with the project known as NPDES
DISCHARGE AND WELL PERMITTING ASSISTANCE AND OTHER ON-CALL SERVICES ("PROJECT");

     WHEREAS, OWNER desires to engage ENGINEER to provide professional
engineering, consulting and related services ("Services") in connection with the
Project; and

     WHEREAS, ENGINEER desires to render these Services as described in SECTION
I, Scope of Services.

     NOW, THEREFORE, OWNER and ENGINEER in consideration of the mutual covenants
contained herein, agree as follows:

SECTION I.     SCOPE OF SERVICES

ENGINEER will provide Services for the Project, which consist of the Scope of
Services as outlined on the attached Exhibit A.

SECTION II.    TERMS AND CONDITIONS OF ENGINEERING SERVICES

The "HDR Engineering, Inc. Terms and Conditions for Professional Services,"
which are attached hereto in Exhibit B, are incorporated into this Agreement by
this reference as if fully set forth herein.

SECTION III.   RESPONSIBILITIES OF OWNER

The OWNER shall provide the information set forth in paragraph 6 of the attached
"HDR "HDR Engineering, Inc. Terms and Conditions for Professional Services" and
shall designate an authorized representative that shall have the authority to
transmit instructions, receive information, and render decisions on behalf of
the OWNER.

SECTION IV.    COMPENSATION

Compensation for ENGINEER'S services under this Agreement shall be on the basis
of fixed hourly labor rates by employee classification plus reimbursable
expenses, as detailed in Exhibit C. Reimbursable expense shall mean the actual
expenses incurred directly or indirectly in connection with the Project for
transportation, travel, meals, expendable supplies, subconsultants,
subcontractors, technology charges (computer

                                       1
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usage), telephone, shipping and express, printing and electronic reproduction,
and other incurred expense. ENGINEER will add ten percent (10%) to all
reimbursable expense to cover administrative, supervision, and insurance
expenses.

The amount of any sales tax, excise tax, value added tax (VAT), or gross
receipts tax that may be imposed on this Agreement shall be added to the
ENGINEER'S compensation as Reimbursable Expenses.

Due to the uncertain nature of this PROJECT, the OWNER intends to utilize the
services of the ENGINEER on an indefinite retainer type basis, rather than
establishing a ceiling price for services. That is, the OWNER shall determine
the extent of services desired on a monthly or more often basis, and the
ENGINEER shall provide monthly invoices for work completed through the billing
cycle. Accordingly, the OWNER, at its own discretion, may elect to terminate
services at any time through a written notice to the ENGINEER, and the
compensation shall be calculated accordingly and due payable up to that point in
time.

If the OWNER elects to have ENGINEER engage in any litigation, arbitration, or
other legal or administrative proceeding, due to the disruptive nature of the
work involved, all associated labor costs shall be multiplied by a factor of 1.5
times the rates set forth in Exhibit C or the most current rates that may have
established beyond the original Period of Service, as discussed in Section V
below and Exhibit A. Such labor shall include, but not be limited to:
participation in meetings with legal counsel; participation in depositions;
providing courtroom or other administrative testimony; preparation of supporting
exhibits; and all other time associated with preparation, travel, and follow-up.

SECTION V.     PERIOD OF SERVICE

Upon receipt of written authorization to proceed, ENGINEER shall perform the
services within the time period(s) described in Exhibit A.

Unless otherwise stated in this Agreement, the rates of compensation for
ENGINEER'S services have been agreed to in anticipation of the orderly and
continuous progress of the project through completion. If any specified dates
for the completion of ENGINEER'S services are exceeded through no fault of the
ENGINEER, the time for performance of those services shall be automatically
extended for a period which may be reasonably required for their completion and
all rates, measures and amounts of ENGINEER'S compensation shall be equitably
adjusted.

                                       2
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IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
day and year first written above.

                                        ADVANCED BIO ENERGY
                                        ----------------------------------------
                                        "OWNER"

                                        BY: /s/ Revis L. Stephenson III
                                            ------------------------------------

                                        NAME: Revis L. Stephenson III
                                              ----------------------------------

                                        TITLE: Chairman
                                               ---------------------------------

                                        ADDRESS: 1850 Fox Ridge Rd.
                                                 -------------------------------
                                                 Orono, MN 55356
                                                 -------------------------------

                                        HDR ENGINEERING, INC.
                                        "ENGINEER"

                                        BY: /s/ Timothy R. Crockett
                                            ------------------------------------

                                        NAME:  Timothy R. Crockett, P.E.
                                              ----------------------------------

                                        TITLE: Senior Vice President
                                               ---------------------------------

                                        ADDRESS: 8404 Indian Hills Drive
                                                 -------------------------------
                                                 Omaha, NE 68114
                                                 -------------------------------

                                       3
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EXHIBIT A
SCOPE OF SERVICES

NPDES DISCHARGE AND WELL PERMITTING ASSISTANCE AND OTHER ON-CALL SERVICES

FOR ADVANCED BIO ENERGY

ENGINEERING PROPOSAL

BACKGROUND AND BASIS OF PROPOSAL

The purpose of this Proposal is to describe the scope of professional
engineering services for ADVANCED BIO ENERGY, FAIRMONT, NEBRASKA ("OWNER") and
HDR ENGINEERING, INC., ("ENGINEER") a Nebraska corporation, with principal
offices at 8404 Indian Hills Drive, Omaha, Nebraska, 68114 for services in
connection with the project known as NPDES DISCHARGE AND WELL PERMITTING
ASSISTANCE AND ON-CALL SERVICES ("PROJECT"). The OWNER desires certain services
from the ENGINEER to assist the OWNER in securing a National Pollution Discharge
Permit System (NPDES) discharge permit(s) for cooling tower blowdown water and
other waste streams, a construction permit for a new well(s) or other related
professional engineering services as may be desired by the OWNER.

PERIOD OF SERVICE

The timing and duration for the scope of services described herein shall be the
same as that set forth by the OWNER; except, however, that the ENGINEER'S rates
set forth in Exhibit C shall only be applicable for work completed through 2005.
If work extends beyond 2005, then such rates shall be equitably adjusted.

SCOPE OF SERVICES

-    If desired by the OWNER, the ENGINEER is prepared to offer waste management
     options screening.

     -    Preliminary Evaluations. Consider various treatment/disposal options
          for handling the combined non-process waste streams involving cooling
          tower blowdown water, reverse osmosis reject water, softener
          regenerate and/or other waste streams. The intended purpose shall be,
          on a draft basis, to furnish to the OWNER a list of candidate waste
          management options for further evaluation. A "decision matrix" can be
          prepared that summarizes monetary and non-monetary factors with due
          considerations for technical soundness, economics, potential
          regulatory issues, and compatibility with overall timing for the
          OWNER's other related activities associated with the construction of a
          new ethanol production facility.

EXHIBIT A--AGREEMENT FOR PROFESSIONAL SERVICES
PAGE 1

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     -    Field Investigations. If necessary, and as directed by the Owner,
          perform certain cursory field investigations that may be of assistance
          in formulating waste management options on a preliminary basis. No
          subconsultant or subcontractor work will be undertaken in this regard
          without express, written consent from the OWNER.

     -    Facilitation/Communications. As directed by the OWNER, attend
          coordination meetings with appropriate agencies; meet separately with
          the OWNER; make technical presentations as may be desired; and provide
          written and oral communications as may be necessary for PROJECT
          coordination.

     -    Follow-up Waste Management Options Screening. Through the
          above-described processes, assist the OWNER in progressively narrowing
          the range of waste management options to a point of consensus with the
          OWNER as to what courses of action should be pursued for securing
          necessary construction and NPDES discharge permit(s) or clearances
          with applicable agencies. This process may include the preparation of
          written technical memoranda that the OWNER can use for attachments to
          permit applications and/or assist in permit negotiations and related
          discussions.

-    Permit Applications. Assemble the permitting documents necessary and submit
     the same to the agencies having jurisdiction. This includes any meetings
     and correspondences necessary for reviewing the technical and regulatory
     aspects of the permit applications and negotiating permit limits, where
     applicable. Permit applications will be prepared for:

     -    Raw water supply well(s).

     -    Construction permit for any wastewater-related pump stations,
          pipelines, storage ponds, etc. not already included in the permitting
          process handled by the design-build firm.

     -    NPDES wastewater discharge permit.

-    Other On-Call Services. Assist the OWNER to the extent desired, and only as
     expressly authorized by the OWNER, for other on-call services that may be
     desired, including stormwater permitting; design and construction phase
     services for supply well(s), water/wastewater treatment facilities,
     stormwater facilities, access roads, rail service spur tracks; etc.

KEY UNDERSTANDINGS AND ASSUMPTIONS

It is assumed by the ENGINEER that the OWNER already possesses or will otherwise
interact with its design-build firm for construction the ethanol production
facilities to acquire all necessary process and other supporting technical
information that may be needed for the ENGINEER to assist the OWNER for this
PROJECT.

Accordingly, the OWNER shall provide the following to the ENGINEER on an
"as-needed" basis:

-    NPDES Discharge Permitting Basic Information Needs.

     -    Contact information for "cognizant official" (corporate principal
          officer at a level of vice president or above), the "authorized
          representative" who can sign

EXHIBIT A--AGREEMENT FOR PROFESSIONAL SERVICES
PAGE 2

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          discharge monitoring reports, and operations manager directly in
          charge of wastewater discharges.

     -    Project site legal description and process SIC number.

     -    General description of intended plant operations and production
          levels.

     -    Intended employment level.

     -    Vicinity map and site layout drawings, including site utilities.

     -    Locations of adjacent dwellings, potable water supply wells, and
          wetlands.

     -    Process flow diagrams, water flow and chemical balances for raw water
          supply and discharge waste streams.

     -    MSDS information for biocides and anti-scalants proposed to be used.

     -    Locations of adjacent dwellings, potable water supply wells, and
          wetlands.

     -    Copy of stormwater management plan or description of how site runoff
          will be handled.

-    Raw Water Supply Well Permitting Basic Information Needs.

     -    Copies of drillers logs

     -    Copies of all laboratory testing results for water quality.

     -    Site map showing proposed location(s) of well(s).

     -    Copy of design technical specifications and drawings for the well,
          pump, and related appurtenances.

-    Right-of-entry to any properties involved in field visits and
     investigations.

The OWNER may elect to have the ENGINEER secure portions of the above
information or certain other supporting information to the extent that the same
may be available or as may be otherwise reasonably acquired, subject to
compensation to the ENGINEER under the applicable terms of this AGREEMENT.

EXHIBIT A--AGREEMENT FOR PROFESSIONAL SERVICES
PAGE 3

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                                    EXHIBIT B

                              HDR ENGINEERING, INC.
                            TERMS AND CONDITIONS FOR
                              PROFESSIONAL SERVICES

1.   STANDARD OF PERFORMANCE

The standard of care for all professional engineering, consulting and related
services performed or furnished by ENGINEER and its employees under this
Agreement will be the care and skill ordinarily used by members of ENGINEER's
profession practicing under the same or similar circumstances at the same time
and in the same locality. ENGINEER makes no warranties, express or implied,
under this Agreement or otherwise, in connection with ENGINEER's services.

2.   INSURANCE

ENGINEER agrees to procure and maintain, at its expense, Workers' Compensation
insurance as required by statute; Employer's Liability of $250,000; Automobile
Liability insurance of $1,000,000 combined single limit for bodily injury and
property damage covering all vehicles, including hired vehicles, owned and
non-owned vehicles; Commercial General Liability insurance of $1,000,000
combined single limit for personal injury and property damage; and Professional
Liability insurance of $1,000,000 per claim for protection against claims
arising out of the performance of services under this Agreement caused by
negligent acts, errors, or omissions for which ENGINEER is legally liable. Upon
request, OWNER shall be made an additional insured on Commercial General and
Automobile Liability insurance policies and certificates of insurance will be
furnished to the OWNER. ENGINEER agrees to indemnify OWNER for the claims
covered by ENGINEER's insurance.

3.   OPINIONS OF PROBABLE COST (COST ESTIMATES)

Any opinions of probable project cost or probable construction cost provided by
ENGINEER are made on the basis of information available to ENGINEER and on the
basis of ENGINEER's experience and qualifications, and represents its judgment
as an experienced and qualified professional engineer. However, since ENGINEER
has no control over the cost of labor, materials, equipment or services
furnished by others, or over the contractor(s') methods of determining prices,
or over competitive bidding or market conditions, ENGINEER does not guarantee
that proposals, bids or actual project or construction cost will not vary from
opinions of probable cost ENGINEER prepares.

4.   CONSTRUCTION PROCEDURES

ENGINEER's observation or monitoring portions of the work performed under
construction contracts shall not relieve the contractor from its responsibility
for performing work in accordance with applicable contract documents. ENGINEER
shall not control or have charge of, and shall not be responsible for,
construction means, methods, techniques, sequences, procedures of construction,
health or safety programs or precautions connected with the work and shall not
manage, supervise, control or have charge of construction. ENGINEER shall not be
responsible for the acts or omissions of the contractor or other parties on the
project. ENGINEER shall be entitled to review all construction contract
documents and to require that no provisions extend the duties or liabilities of
ENGINEER beyond those set forth in this Agreement. OWNER agrees to include
ENGINEER as an indemnified party in OWNER's construction contracts for the work,
which shall protect ENGINEER to the same degree as OWNER. Further, OWNER agrees
that ENGINEER shall be listed as an additional insured under the construction
contractor's liability insurance policies.

5.   CONTROLLING LAW

This Agreement is to be governed by the law of the state where ENGINEER's
services are performed.

6.   SERVICES AND INFORMATION

OWNER will provide all criteria and information pertaining to OWNER's
requirements for the project, including design objectives and constraints,
space, capacity and performance requirements, flexibility and expandability, and
any budgetary limitations. OWNER will also provide copies of any OWNER-furnished
Standard Details, Standard Specifications, or Standard Bidding Documents which
are to be incorporated into the project. OWNER will furnish the services of
soils/geotechnical engineers or other consultants that include reports and
appropriate professional recommendations when such services are deemed necessary
by ENGINEER. The OWNER agrees to bear full responsibility for the technical
accuracy and content of OWNER-

EXHIBIT B--TERMS AND CONDITIONS FOR PROFESSIONAL SERVICES
PAGE 1                                                                       HDR

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furnished documents and services. In performing professional engineering and
related services hereunder, it is understood by OWNER that ENGINEER is not
engaged in rendering any type of legal, insurance or accounting services,
opinions or advice. Further, it is the OWNER's sole responsibility to obtain the
advice of an attorney, insurance counselor or accountant to protect the OWNER's
legal and financial interests. To that end, the OWNER agrees that OWNER or the
OWNER's representative will examine all studies, reports, sketches, drawings,
specifications, proposals and other documents, opinions or advice prepared or
provided by ENGINEER, and will obtain the advice of an attorney, insurance
counselor or other consultant as the OWNER deems necessary to protect the
OWNER's interests before OWNER takes action or forebears to take action based
upon or relying upon the services provided by ENGINEER.

7.   SUCCESSORS AND ASSIGNS

OWNER and ENGINEER, respectively, bind themselves, their partners, successors,
assigns, and legal representatives to the covenants of this Agreement. Neither
OWNER nor ENGINEER will assign, sublet, or transfer any interest in this
Agreement or claims arising therefrom without the written consent of the other.

8.   RE-USE OF DOCUMENTS

All documents, including all reports, drawings, specifications, computer
software or other items prepared or furnished by ENGINEER pursuant to this
Agreement, are instruments of service with respect to the project. ENGINEER
retains ownership of all such documents. OWNER may retain copies of the
documents for its information and reference in connection with the project;
however, none of the documents are intended or represented to be suitable for
reuse by OWNER or others on extensions of the project or on any other project.
Any reuse without written verification or adaptation by ENGINEER for the
specific purpose intended will be at OWNER's sole risk and without liability or
legal exposure to ENGINEER, and OWNER will defend, indemnify and hold harmless
ENGINEER from all claims, damages, losses and expenses, including attorney's
fees, arising or resulting therefrom. Any such verification or adaptation will
entitle ENGINEER to further compensation at rates to be agreed upon by OWNER and
ENGINEER.

9.   TERMINATION OF AGREEMENT

OWNER or ENGINEER may terminate the Agreement, in whole or in part, by giving
seven (7) days written notice, if the other party substantially fails to fulfill
its obligations under the Agreement through no fault of the terminating party.
Where the method of payment is "lump sum," or cost reimbursement, the final
invoice will include all services and expenses associated with the project up to
the effective date of termination. An equitable adjustment shall also be made to
provide for termination settlement costs ENGINEER incurs as a result of
commitments that had become firm before termination, and for a reasonable profit
for services performed.

10.  SEVERABILITY

If any provision of this agreement is held invalid or unenforceable, the
remaining provisions shall be valid and binding upon the parties. One or more
waivers by either party of any provision, term or condition shall not be
construed by the other party as a waiver of any subsequent breach of the same
provision, term or condition.

11.  INVOICES

ENGINEER will submit monthly invoices for services rendered and OWNER will make
prompt payments in response to ENGINEER's invoices. ENGINEER will retain
receipts for reimbursable expenses in general accordance with Internal Revenue
Service rules pertaining to the support of expenditures for income tax purposes.
Receipts will be available for inspection by OWNER's auditors upon request. If
OWNER disputes any items in ENGINEER's invoice for any reason, including the
lack of supporting documentation, OWNER may temporarily delete the disputed item
and pay the remaining amount of the invoice. OWNER will promptly notify ENGINEER
of the dispute and request clarification and/or correction. After any dispute
has been settled, ENGINEER will include the disputed item on a subsequent,
regularly scheduled invoice, or on a special invoice for the disputed item only.
OWNER recognizes that late payment of invoices results in extra expenses for
ENGINEER. ENGINEER retains the right to assess OWNER interest at the rate of one
percent (1 %) per month, but not to exceed the maximum rate allowed by law, on
invoices which are not paid within forty-five (45) days from the date of the
invoice. In the event undisputed portions of ENGINEER's invoices

EXHIBIT B--TERMS AND CONDITIONS FOR PROFESSIONAL SERVICES
PAGE 2                                                                       HDR

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are not paid when due, ENGINEER also reserves the right, after seven (7) days
prior written notice, to suspend the performance of its services under this
Agreement until all past due amounts have been paid in full.

12.  CHANGES

The parties agree that no change or modification to this Agreement, or any
attachments hereto, shall have any force or effect unless the change is reduced
to writing, dated, and made part of this Agreement. The execution of the change
shall be authorized and signed in the same manner as this Agreement. Adjustments
in the period of services and in compensation shall be in accordance with
applicable paragraphs and sections of this Agreement. Any proposed fees by
ENGINEER are estimates to perform the services required to complete the project
as ENGINEER understands it to be defined. For those projects involving
conceptual or process development services, activities often are not fully
definable in the initial planning. In any event, as the project progresses, the
facts developed may dictate a change in the services to be performed, which may
alter the scope. ENGINEER will inform OWNER of such situations so that changes
in scope and adjustments to the time of performance and compensation can be made
as required. If such change, additional services, or suspension of services
results in an increase or decrease in the cost of or time required for
performance of the services, an equitable adjustment shall be made, and the
Agreement modified accordingly.

13.  CONTROLLING AGREEMENT

These Terms and Conditions shall take precedence over any inconsistent or
contradictory provisions contained in any proposal, contract, purchase order,
requisition, notice-to-proceed, or like document.

14.  EQUAL EMPLOYMENT AND NONDISCRIMINATION

In connection with the services under this Agreement, ENGINEER agrees to comply
with the applicable provisions of federal and state Equal Employment
Opportunity, and other employment statutes and regulations.

15.  HAZARDOUS MATERIALS

OWNER represents to ENGINEER that, to the best of its knowledge, no hazardous
materials are present at the project site. However, in the event hazardous
materials are known to be present, OWNER represents that to the best of its
knowledge it has disclosed to ENGINEER the existence of all such hazardous
materials, including but not limited to asbestos, PCB's, petroleum, hazardous
waste, or radioactive material located at or near the project site, including
type, quantity and location of such hazardous materials. It is acknowledged by
both parties that ENGINEER's scope of services do not include services related
in any way to hazardous materials. In the event ENGINEER or any other party
encounters undisclosed hazardous materials, ENGINEER shall have the obligation
to notify OWNER and, to the extent required by law or regulation, the
appropriate governmental officials, and ENGINEER may, at its option and without
liability for delay, consequential or any other damages to OWNER, suspend
performance of services on that portion of the project affected by hazardous
materials until OWNER: (i) retains appropriate specialist consultant(s) or
contractor(s) to identify and, as appropriate, abate, remediate, or remove the
hazardous materials; and (ii) warrants that the project site is in full
compliance with all applicable laws and regulations. OWNER acknowledges that
ENGINEER is performing professional services for OWNER and that ENGINEER is not
and shall not be required to become an "arranger," "operator," "generator," or
"transporter" of hazardous materials, as defined in the Comprehensive
Environmental Response, Compensation, and Liability Act of 1990 (CERCLA), which
are or may be encountered at or near the project site in connection with
ENGINEER's services under this Agreement. If ENGINEER's services hereunder
cannot be performed because of the existence of hazardous materials, ENGINEER
shall be entitled to terminate this Agreement for cause on 30 days written
notice. To the fullest extent permitted by law, OWNER shall indemnify and hold
harmless ENGINEER, its officers, directors, partners, employees, and
subconsultants from and against all costs, losses, and damages (including but
not limited to all fees and charges of engineers, architects, attorneys, and
other professionals, and all court or arbitration or other dispute resolution
costs) caused by, arising out of or resulting from hazardous materials, provided
that (i) any such cost, loss, or damage is attributable to bodily injury,
sickness, disease, or death, or injury to or destruction of tangible property
(other than completed Work), including the loss of use resulting therefrom, and
(ii)

EXHIBIT B--TERMS AND CONDITIONS FOR PROFESSIONAL SERVICES
PAGE 3                                                                       HDR

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nothing in this paragraph shall obligate OWNER to indemnify any individual or
entity from and against the consequences of that individual's or entity's sole
negligence or willful misconduct.

16.  EXECUTION

This Agreement, including the exhibits and schedules made part hereof,
constitute the entire Agreement between ENGINEER and OWNER, supersedes and
controls over all prior written or oral understandings. This Agreement may be
amended, supplemented or modified only by a written instrument duly executed by
the parties.

17.  LIMITATION OF LIABILITY

ENGINEER's and its employees' total liability to OWNER for any loss or damage,
including but not limited to special and consequential damages arising out of or
in connection with the performance of services or any other cause, including
ENGINEER's and its employees' professional negligent acts, errors, or omissions,
shall not exceed the greater of $50,000 or the total compensation received by
ENGINEER hereunder, except as otherwise provided under this Agreement, and OWNER
hereby releases and holds harmless ENGINEER and its employees from any liability
above such amount.

18.  LITIGATION SUPPORT

In the event ENGINEER is required to respond to a subpoena, government inquiry
or other legal process related to the services in connection with a legal or
dispute resolution proceeding to which ENGINEER is not a party, OWNER shall
reimburse ENGINEER for reasonable costs in responding and compensate ENGINEER at
its then standard rates for reasonable time incurred in gathering information
and documents and attending depositions, hearings, and trial.

EXHIBIT B--TERMS AND CONDITIONS FOR PROFESSIONAL SERVICES
PAGE 4                                                                       HDR

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EXHIBIT C

SCHEDULE OF PROFESSIONAL LABOR RATES

NPDES DISCHARGE AND WELL PERMITTING ASSISTANCE AND OTHER ON-CALL SERVICES

FOR ADVANCED BIO ENERGY

ENGINEERING PROPOSAL

The following billable labor rates shall be applicable THROUGH CALENDAR YEAR
2005, subject to the provisions in SECTION IV and SECTION V of the AGREEMENT:

<Table>
<Caption>
------------------------------------------------- ------------------------
                                                       BILLABLE RATE
            EMPLOYEE CLASSIFICATION                      PER HOUR
------------------------------------------------- ------------------------
<S>                                               <C>

Project Principal                                                 $220.00
------------------------------------------------- ------------------------
Project Manager                                                   $150.00
------------------------------------------------- ------------------------
Senior Engineering/Senior Technical                               $170.00
------------------------------------------------- ------------------------
Senior Project Engineer                                           $140.00
------------------------------------------------- ------------------------
Project Engineer                                                  $115.00
------------------------------------------------- ------------------------
Engineer/Scientist                                                $100.00
------------------------------------------------- ------------------------
Engineering Technician                                             $95.00
------------------------------------------------- ------------------------
Junior Engineer/Scientist                                          $85.00
------------------------------------------------- ------------------------
CAD Designer                                                       $90.00
------------------------------------------------- ------------------------
CAD Technician                                                     $75.00
------------------------------------------------- ------------------------
Word Processing                                                    $55.00
------------------------------------------------- ------------------------
Accounting                                                        $100.00
------------------------------------------------- ------------------------
</Table>

Technology charges (computer usage), as a part of reimbursable expenses, shall
be billed at the rate of $4.10 per labor hour for each of the employee
classifications listed above for each monthly payment cycle. Personal vehicle
mileage expenses shall be charged at $0.405 per mile in accordance with IRS
allowances for 2005.

EXHIBIT C--SCHEDULE OF PROFESSIONAL LABOR RATES
PAGE 1                                                                       HDR

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