Document:

<PAGE>   1
                                                                   EXHIBIT 10.43

L100
                            1. Vendor's Office copy

Page     1                       State of Oklahoma
                            Department of Central Services           P0. T053389
BUYER - LL (405-521-3046)         Purchase Order

Date                              Agency                          Delivery
Issued: 01/13/00 Regn.#: K046809  Regn.#: 00-436680  Terms: NET   Date: 01/19/00
--------------------------------------------------------------------------------

TO: 752677182                        Ship TO:    18501
    SIMPCO INC                                   OKLAHOMA CORPORATION COMMISSION
    P 0 BOX 269                                  ROOM 342 JIM THORPE BLDG.
    NOWATA OK 74048                              2101 N LINCOLN
                                                 OKLA CITY,             OK 73105

                                     Charge &    18501
                                     Invoice To: OKLAHOMA CORPORATION COMMISSION
                                                 ROOM 342 JIM THORPE BLDG.
                                                 2101 N LINCOLN
                                                 OKLA CITY,             OK 73105

<TABLE>
<CAPTION>

Item   Quantity   Unit   Commodity Code        Description                       Unit Price           Amount
-------------------------------------------------------------------------------------------------------------

<S>     <C>       <C>  <C>                     <C>                              <C>                 <C>
001     1.00      SUM  0962-96-10                                               24,300,000000       24,300.00
                       Plug 28 Oil/Gal well.
                       Well Name:  SEE ATTACHMENT "A"
                       Legal Desc: NE/4
                       Section 07, Township 24 North, Range 17 East
                       Rogers County, Oklahoma
                       Order 110. 436680

                       Emergency:  Potential danger to personal property, etc.

                       Wall(5) to be plugged in accordance with the
                       Oklahoma Corporation Commission -
                       Cause S.F. # 990000069T   ITN #: 00-11025
                       Order * 436680
                                                                                                   ==========
                                                                                Total Amount       $24,300.00

        TERMS:
                       Work to be commenced within 14 day. from days of
                       award of contract. Work to be completed within 90
                       days from date of award of contract.

                       Continued Next Page
-------------------------------------------------------------------------------------------------------------
</TABLE>

Prices exclusive of Federal and State Taxes. Prices are FOB destination unless
stated otherwise.

VENDORS READ AND FOLLOW CLOSELY

1       This order void one year from date of issuance.

2.      The above order is issued in conformity with your quotation and
        constitutes a contract.

3.      If payment is received in excess of 45 day.
        after submitting proper invoice, vendor may be       /s/ STAMP SIGNATURE
        be entitled to claim interest penalty.
        For a copy of these regulations contact      signed

                  OFFICE OF STATE FINANCE                     Director/Designee
                                                              -----------------
        Room 122, State Capitol Bldg, OKC, OK. 73105                title

<PAGE>   2
                            1. Vendor's Office Copy

                               State of Oklahoma
                         Department of Central Services              PO# TO53389
BUYER - LL                       Purchase Order
<TABLE>
<CAPTION>
Date: 01/13/00                   Regn. # K046809            Agency Regn. #00-436680            Page # 2
--------------                   ---------------            -----------------------            --------

Item   Quantity   Unit     Commodity Code    Description                Unit Price                    Amount
<S>    <C>        <C>      <C>               <C>            <C>         <C>                    <C>    <C>

                                    NOTE: Completed invoice and plugging report(s) to
                                    be sent to the Commission District Office for
                                    approval.
</TABLE><PAGE>   1
                                                                   EXHIBIT 10.44

                                 PROMISSORY NOTE

$20,000.00                      Lewisville, Texas                  MARCH 7, 2000

For value received, BASIC TECHNOLOGIES, INC. promises to pay to the order of
Nina E. Angelo, the sum of TWENTY THOUSAND AND NO/100 DOLLARS ($20,000.000) in
legal and lawful money of the United States of America, with interest thereon
from the date hereof until maturity at the rate of TWELVE percent (12%) per
annum on the unpaid balance.

This note is due and payable as follows, to wit:

     ACCRUED MONTHLY INTEREST ONLY SHALL BE PAYABLE ON APRIL 7, 2000; MAY 7,
2000; JUNE 7, 2000; AND JULY 7, 2000. PRINCIPAL SHALL BE DUE AND PAYABLE IN FULL
ON JULY 7, 2000.

This note shall be secured by the rights to and proceeds from contracts with the
States of Texas and Oklahoma.

The undersigned may prepay this note without penalty. In the event any payment
due hereunder is not paid when due, the entire balance shall be immediately due
upon demand of any holder. Upon default, the undersigned shall pay all
reasonable attorney fees and costs necessary for the collection of this note.

Signed this 7th day of March, 2000.

                                          BASIC TECHNOLOGIES, INC.

                                          By: /s/ B WALKER
                                              ----------------------------------
                                              Bryan L. Walker, President
ATTEST:

/s/ RICHARD C. SMITH
------------------------------
Richard C. Smith
Chief Financial Officer<PAGE>   1
                                                                   EXHIBIT 10.45

                                 PROMISSORY NOTE

$30,000.00                      Lewisville, Texas                  APRIL 5, 2000

For value received, BASIC TECHNOLOGIES, INC., AND P & A REMEDIATION, LLC.,
promises to pay to the order of Edwin Dean, the sum of THIRTY THOUSAND AND
NO/100 DOLLARS ($30,000.000) in legal and lawful money of the United States of
America, with interest thereon from the date hereof until maturity at the rate
of TWELVE percent (12%) per annum on the unpaid balance.

This note is due and payable as follows, to wit:

     ACCRUED MONTHLY INTEREST ONLY SHALL BE PAYABLE ON MAY 5 2000; JUNE 5, 2000;
JULY 5, 2000; AND AUGUST 5, 2000. PRINCIPAL SHALL BE DUE AND PAYABLE IN FULL ON
AUGUST 5, 2000.

This note shall be secured by a security interest in the following :

     Halliburton Cement Float VIN# 6477, New Mexico Title #82069004A337729
     Halliburton Cement Float VIN# 4826, Louisiana Title #C8396539

The undersigned may prepay this note without penalty. In the event any payment
due hereunder is not paid when due, the entire balance shall be immediately due
upon demand of any holder. Upon default, the undersigned shall pay all
reasonable attorney fees and costs necessary for the collection of this note.

Signed this 5th day of April, 2000.

ATTEST:                                     BASIC TECHNOLOGIES, INC.

/s/ RICHARD C. SMITH                        By: /s/ B WALKER
----------------------------                    --------------------------------
Richard C. Smith                                Bryan L. Walker, President
Chief Financial Officer

                                            P & A REMEDIATION, LLC.

                                            By: /s/ RICHARD C. SMITH
                                                --------------------------------
                                                Richard C. Smith , Manager<PAGE>   1
                                                                   EXHIBIT 10.46

                                 PROMISSORY NOTE

$15,000.00                      Lewisville, Texas                 APRIL 12, 2000

For value received, BASIC TECHNOLOGIES, INC., AND P & A REMEDIATION, LLC.,
promises to pay to the order of Cynthia Rice Cleaver, Trustee, the sum of TWENTY
NINE THOUSAND SEVEN HUNDRED NINETY AND 60/100 DOLLARS ($29,790.60) in legal and
lawful money of the United States of America, with interest thereon from the
date hereof until maturity at the rate of TWELVE percent (12%) per annum on the
unpaid balance.

This note is due and payable as follows, to wit:

     ACCRUED MONTHLY INTEREST ONLY SHALL BE PAYABLE ON MAY 12, 2000; JUNE 12,
2000; JULY 12, 2000; AND AUGUST 12, 2000. PRINCIPAL SHALL BE DUE AND PAYABLE IN
FULL ON AUGUST 12, 2000.

This note shall be secured by a security interest in the following :

     Halliburton Cement Float VIN# 4804, Texas Title #75280932
     Reliable Tank Trailer, VIN# 2167, Texas Title 20299249

The undersigned may prepay this note without penalty. In the event any payment
due hereunder is not paid when due, the entire balance shall be immediately due
upon demand of any holder. Upon default, the undersigned shall pay all
reasonable attorney fees and costs necessary for the collection of this note.

Signed this 12th day of April, 2000.

ATTEST:                                     BASIC TECHNOLOGIES, INC.

/s/ RICHARD C. SMITH                        By: /s/ B WALKER
---------------------------                     --------------------------------
Richard C. Smith                                Bryan L. Walker, President
Chief Financial Officer

                                            P & A REMEDIATION, LLC.

                                            By: /s/ RICHARD C. SMITH
                                                --------------------------------
                                                Richard C. Smith, Manager

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