Document:

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                                                                  EXHIBIT 10.1

                   AMENDMENT NO. 3 TO BUSINESS LOAN AGREEMENT
                          (RECEIVABLES AND INVENTORY)

         This  Amendment No. 3 (the  "Amendment")  dated as August 2, 2000,  is
between BANK OF AMERICA,  N.A. (the "Bank") and HUNTWAY REFINING COMPANY (the
"Borrower").

                                    RECITALS

         A.       The Bank and the Borrower are parties to that certain
Business Loan Agreement  (Receivables  and Inventory) dated as of October 29,
1999, as previously amended (the "Agreement").

         B.       The Bank and the Borrower desire to further amend the
Agreement as herein provided.

                                   AGREEMENT

         1.       Definitions.  Capitalized  terms used but not  defined in this
Amendment  shall have the meaning given to them in the Agreement.

         2.       Amendments.   The Agreement is hereby amended as follows:

                  2.1. In Section 1.1(b) of the Agreement, the phrase "the
         Inventory Cap" is substituted for the figure "Ten Million Dollars
         ($10,000,000)" appearing therein.

                  2.2 Section 1.1 of the Agreement is further amended to fully
         restate the first sentence of the second paragraph of said section to
         read as follows:

                           "If at any time the total amount of principal
                           outstanding under the line of credit and the Reserve
                           (as defined in Section 2.1 (e) hereof) exceeds this
                           limit, the Borrower will immediately either increase
                           the loan value of marketable securities or other
                           acceptable collateral pledged to the Collateral
                           Agent, or reduce the total amount outstanding in
                           order to comply with this limit."

                  2.3. In Section 1.3(b) of the Agreement, the phrase "ten
         percent (10%) of the available Inventory Cap" is substituted for the
         figure "$500,000" appearing therein.

                  2.4. In Section 1.3(c) of the Agreement, the phrase "fifteen
         percent (15%) of the available Inventory Cap" is substituted for the
         figure "One Million Dollars ($1,000,000)" appearing therein.

                                      -1-
<PAGE>   2
                  2.5.     The first sentence of Section 1.3(d) of the
         Agreement is amended in full to read as follows:

                           "The inventory is held for sale or use in the
                           ordinary course of Borrower's business and is of good
                           and merchantable quality, including work-in-process
                           inventory, returned inventory and inventory
                           manufactured to the specifications of an account
                           debtor."

                  2.6.     Section 1.6 of the Agreement is amended in full to
         read as follows:

                           "'Credit Limit' means the amount of (i) Thirty
                           Million Dollars ($30,000,000) during the period of
                           May 1st through November 30th of each year, or (ii)
                           Twenty-Five Million Dollars ($25,000,000) during the
                           period of December 1st through April 30th of each
                           year."

                  2.7.     The Agreement is amended to add a new Section 1.17
         (acknowledged by the parties hereto to be out of alphabetical order to
         avoid renumbering of sections) to read as follows:

                           "1.17 `Inventory Cap' means, as of any date of
                           determination, the amount shown below, determined
                           from the borrowing certificate delivered by the
                           Borrower as of the end of each month pursuant to
                           Section 9.3(d) hereof, based upon the average daily
                           purchase price of crude oil per barrel (`bbl') shown
                           on the Kern River, Chevron Posting Purchased Oil
                           Price (`KRCP Price') for such month:

                           -----------------------------------------------------

                                    AVERAGE DAILY                    AMOUNT OF
                                     KRCP PRICE                    INVENTORY CAP
                           -----------------------------------------------------
                           Less than or equal to                    $10,000,000
                           $10.00/bbl
                           -----------------------------------------------------
                           Greater than $10.00/bbl but              $12,500,000
                           less than or equal to
                           $20.00/bbl
                           -----------------------------------------------------
                           Greater than $20.00/bbl                  $15,000,000"
                           -----------------------------------------------------

                  2.8      In the first sentence of Section 2.1 (d) of the
         Agreement, the phrase "plus

                                      -2-
<PAGE>   3
         the face amount of any outstanding letters of credit" is substituted
         for the phrase "plus the outstanding amounts of any letters of credit"
         appearing therein.

                  2.9.     Section 2.1(e) of the Agreement is amended in full to
         read as follows:

                           "(e) In determining the net amount available to the
                           Borrower under the line of credit, the Bank will
                           reserve under the Borrowing Base the total of (i) an
                           amount equal to the lesser of the face amount of any
                           outstanding standby letter of credit or the actual
                           amount of the underlying accounts payable to the
                           beneficiary of such letter of credit, (ii) the face
                           amount of any outstanding commercial letter of
                           credit, and (iii) One Million Dollars ($1,000,000)
                           for capital expenditures (in the aggregate the
                           "Reserve")."

                  2.10.    In Section 2.2 of the Agreement, the date "June 1,
         2002" is substituted for the date "June 1, 2001" appearing therein.

                  2.11     In Section 2.7 of the Agreement, the date "December
         1, 2002" is substituted for the date "November 1, 2001" appearing
         therein.

                  2.12.    Section 9.3(d) of the Agreement is amended in full to
         read as follows:

                           "(d) A borrowing certificate setting forth the amount
                           of Acceptable Receivables and Acceptable Inventory as
                           of (i) the 10th day of each month, (ii) the 20th day
                           of each month and (iii) as of the last day of each
                           month, within 7 days after each period with respect
                           to (i) and (ii) and within 10 days of month end with
                           respect to (iii) and, upon the Bank's request, copies
                           of the invoices or the record of invoices from the
                           Borrower's sales journal for such Acceptable
                           Receivables, copies of the delivery receipts,
                           purchase orders, shipping instructions, bills of
                           lading and other documentation pertaining to such
                           Acceptable Receivables, and copies of the cash
                           receipts journal pertaining to the borrowing
                           certificate. In the borrowing certificate Borrower
                           shall represent and warrant that all Acceptable
                           Receivables are net of any credits due as a result of
                           price adjustments or de-escalation as it relates to
                           indexing programs. The borrowing certificate shall
                           include the total amount of outstanding standby
                           letters of credit and the total amount of accounts
                           payable due to the beneficiaries of the

                                      -3-
<PAGE>   4
                           outstanding standby letters of credit. The borrowing
                           certificate for month-end shall include information
                           with respect to the average daily KRCP Price of crude
                           oil per barrel for such month."

                  2.13.    In Section 9.3, subsection (k) is amended to read as
         "(l)" and a new subsection (k) is added to read as follows:

                           "(k) Within the periods provided in (a) and (b)
                           above, a compliance certificate signed by the
                           Borrower setting forth (i) the information and
                           computations (in sufficient detail) to establish that
                           the Borrower is in compliance with all financial
                           covenants at the end of the period covered by the
                           financial statements then being furnished and (ii)
                           whether there existed as of the date of such
                           financial statements and whether there exists as of
                           the date of the certificate, any default under this
                           Agreement and, if any such default exists, specifying
                           the nature thereof and the action the Borrower is
                           taking and proposes to take with respect thereto."

         3. Representations and Warranties. When the Borrower signs this
Amendment, the Borrower represents and warrants to the Bank that: (a) there is
no event which is, or with notice or lapse of time or both would be, a default
under the Agreement except those events, if any, that have been disclosed in
writing to the Bank or waived in writing by the Bank, (b) the representations
and warranties in the Agreement are true as if made on the date of this
Amendment, (c) this Amendment is within the Borrower's powers, has been duly
authorized, and does not conflict with any of the Borrower's organizational
papers, and (d) this Amendment does not conflict with any law, Agreement, or
obligation by which the Borrower is bound.

         4. Conditions. This Amendment will be effective when the Bank receives
the following items, in form and content acceptable to the Bank.

                  4.1. This Amendment duly executed by all parties hereto.

                  4.2. Evidence that the execution, delivery and performance by
         the Borrower of this Amendment has been duly authorized.

         5. Effect of Amendment. Except as provided in this Amendment, all of
the terms and conditions of the Agreement shall remain in full force and effect.

                                      -4-
<PAGE>   5
     This Agreement is executed as of the date stated at the beginning of this
Amendment.

                                         HUNTWAY REFINING COMPANY

                                         By: _______________________________
                                         Name: _____________________________
                                         Title: ____________________________

                                         BANK OF AMERICA, N.A.

                                         By: _______________________________
                                         Name: _____________________________
                                         Title: ____________________________

                                      -5-EXHIBIT 10

                           CERTIFICATE OF DESIGNATIONS
                           ---------------------------

                                       OF
                                       --

                      SERIES B CONVERTIBLE PREFERRED STOCK
                      ------------------------------------

                                       OF
                                       --

                       DIGITAL TRANSMISSION SYSTEMS, INC.
                       ----------------------------------

                  Digital Transmission Systems, Inc., a corporation organized
and existing under the General Corporation Law of the State of Delaware (the
"Corporation"), in accordance with the provisions of Section 151(g) thereof,

                  HEREBY CERTIFIES:

                  That, the Corporation's Board of Directors adopted by
unanimous written consent dated March 31, 2000, the following resolution
creating a series of Preferred Stock designated as Series B Convertible
Preferred Stock:

                  RESOLVED, that pursuant to the authority granted to the Board
of Directors by Article FOURTH, of the Amended and Restated Certificate of
Incorporation of the Corporation (the "Certificate"), there is hereby created,
and the Corporation be, and it hereby is, authorized to issue, 454,737 shares of
a series of Preferred Stock which shall have the following designations, powers,
preferences, rights and restrictions:

                  1.       DESIGNATION. The authorized shares of preferred stock
shall be known and designated as Series B Redeemable Convertible Preferred Stock
(the "Series B Preferred Stock"), without par value per share and shall consist
of 454,737 shares.

                  2.       POWERS, PREFERENCES AND RIGHTS. The powers,
preferences and rights, and the qualifications, limitations and restrictions of
the Series B Preferred Stock are as follows:

                           (a)      DIVIDENDS. THE HOLDERS OF THE SERIES A
PREFERRED STOCK SHALL NOT BE ENTITLED TO RECEIVE DIVIDENDS ON ACCOUNT OF THE
SERIES B PREFERRED STOCK. NO DIVIDENDS MAY BE PAID ON THE COMMON STOCK OF THE
CORPORATION OR ON ANY OTHER CLASS OF STOCK AS LONG AS ANY SERIES B PREFERRED
STOCK REMAINS OUTSTANDING.

                           (b)      LIQUIDATION PREFERENCE. In the event of any
voluntary or involuntary sale of all or a substantial portion of the
Corporation's capital stock or all or a substantial portion of the Corporation's
assets, or any merger or consolidation of the

<PAGE>

Corporation with another entity, or any liquidation or dissolution of the
Corporation, voluntary or involuntary (such events to be hereinafter
collectively referred to as the "Liquidation Events"), then the holders of the
Series B Preferred Stock shall be entitled to receive, prior to the receipt of
any assets by holders of all other equity securities of the Corporation (other
than holders of the Corporation's Series A Preferred Stock who shall receive a
preferential distribution of $1.00 per share), a cash amount equal to $7.125 for
each share of Series B Preferred Stock held (adjusted for any stock dividends,
combinations or splits with respect to such shares) (the "Redemption Price").
Such payment with respect to the Series B Preferred Stock shall constitute the
extent of the participation of the holders of the Series B Preferred Stock, with
respect to their shares of Series B Preferred Stock, in any and all present or
future corporate distributions, or the stock, securities, or assets to be
received by holders of equity securities of the Corporation, and the shares of
the Series B Preferred Stock shall thereafter be redeemed and canceled and shall
be so reflected on the books of the Corporation.

                           (c)      VOTING RIGHTS. Except as otherwise provided
by applicable law, the shares of Series B Preferred Stock shall not entitle
their holders to any voting rights as stockholders of the Corporation prior to
conversion pursuant to Section 4 hereof.

                  3.       REDEMPTION AT THE OPTION OF THE CORPORATION

                           (a)      PROPORTIONAL REDEMPTION. The Corporation
may, at the option of the Board of Directors, redeem up to all shares of the
Series B Preferred Stock by paying in cash therefor a sum equal to 110 % of the
Redemption Price. Any redemption effected pursuant to this Subsection 3(a) shall
be made on a pro rata basis among the holders of the Series B Preferred Stock in
proportion to the number of shares of Series B Preferred Stock then held by
them.

                           (b)      REDEMPTION NOTICE. At least sixty (60) but
no more than seventy-five (75) days prior to the date on which the Corporation
desires to redeem shares of Series B Preferred Stock (a "Redemption Date"),
written notice shall be delivered via overnight courier to each holder of record
(at the close of business on the business day next preceding the day on which
notice is given) of the Series B Preferred Stock to be redeemed, at the address
last shown on the records of the Corporation for such holder, notifying such
holder of the redemption to be effected, specifying the number of shares to be
redeemed from such holder, the Redemption Date, the Redemption Price, the place
at which payment may be obtained and calling upon such holder to surrender to
the Corporation, in the manner and at the place designated, his, her or its
certificate or certificates representing the shares to be redeemed (the
"Redemption Notice"). Except as provided in Subsection 3(c), on or after the
Redemption Date, each holder of Series B Preferred Stock to be redeemed shall
surrender to the Corporation the certificate or certificates representing such
shares, in the manner and at the place designated in the Redemption Notice, and
thereupon the Redemption Price of such shares shall be payable

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<PAGE>

to the order of the person whose name appears on such certificate or
certificates as the owner thereof and each surrendered certificate shall be
canceled. In the event less than all the shares represented by any such
certificate are redeemed, a new certificate shall be issued representing the
unredeemed shares.

                           (c)      CLOSING AND EFFECT OF REDEMPTION. From and
after the Redemption Date and provided that on or prior to the Redemption Date
the Corporation shall have irrevocably deposited funds for such redemption in
trust for the holders of shares of Series B Preferred Stock to be redeemed,
unless there shall have been a default in payment of the Redemption Price, all
rights of the holders of shares of Series B Preferred Stock designated for
redemption in the Redemption Notice as holders of Series B Preferred Stock
(except the right to receive the Redemption Price without interest upon
surrender of their certificate or certificates) shall cease with respect to such
shares, and such shares shall not thereafter be transferred on the books of the
Corporation or be deemed to be outstanding for any purpose whatsoever. If the
funds of the Corporation legally available for redemption of shares of Series B
Preferred Stock on any Redemption Date are insufficient to redeem the total
number of shares of Series B Preferred Stock to be redeemed on such date, those
funds that are legally available will be used to redeem the maximum possible
number of such shares ratably among the holders of such shares to be redeemed
based upon their holdings of Series B Preferred Stock. The shares of Series B
Preferred Stock not redeemed shall remain outstanding and entitled to all the
rights and preferences provided herein. At any time thereafter when additional
funds of the Corporation are legally available for the redemption of shares of
Series B Preferred Stock, such funds will immediately be used to redeem the
balance of the shares which the Corporation has become obliged to redeem on any
Redemption Date but which it has not redeemed.

                  4.       CONVERSION. The holders of the Series A Preferred
Stock shall have conversion rights as follows (the "Conversion Rights"):

                           (a)      CONVERSION RIGHT. At any time up to and
including the third day prior to the Redemption Date, if any, as may have been
fixed in any Redemption Notice with respect to the Series B Preferred Stock, a
holder of Series B Preferred Stock may convert any or all of such shares into
such number of fully paid and nonassessable shares of Common Stock as is
determined by dividing $7.125 for each share of Series B Preferred Stock (the
"Original Series B Issue Price") by the Conversion Price applicable to such
share, determined as hereafter provided, in effect on the date the certificate
is surrendered for conversion.

                           (b)      PROCEDURE FOR CONVERSION. Before any holder
of Series B Preferred Stock shall be entitled to convert the same into shares of
Common Stock, such holder shall surrender the certificate or certificates
therefor, duly endorsed, at the office of the Corporation or of any transfer
agent for the Series B Preferred Stock, and shall give written notice to the
Corporation at its principal corporate office, of the election to convert the
same and shall state therein the name or names in which the certificate or
certificates for shares of Common Stock are to be issued. The Corporation shall,
as soon as practicable but not later than fifteen (15) days thereafter, issue
and deliver at such office to such holder of Series B Preferred Stock, or to the
nominee or nominees of such holder, a certificate or certificates for the number
of shares of Common Stock to which such holder shall be entitled as aforesaid.
Such conversion shall be deemed to have been

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<PAGE>

made immediately prior to the close of business on the dare of such surrender of
the shares of Series B Preferred Stock to be converted, and the person or
persons entitled to receive the shares of Common Stock issuable upon such
conversion shall be treated for all purposes as the record holder or holders of
such shares of Common Stock as of such date. If the conversion is in connection
with an underwritten offering of securities registered pursuant to the
Securities Act of 1933, as amended, the conversion may, at the option of any
holder tendering Series B Preferred Stock for conversion, be conditioned upon
the closing with the underwriters of the sale of securities pursuant to such
offering, in which event the person(s) entitled to receive the Common Stock
issuable upon conversion of the Series B Preferred Stock shall not be deemed to
have converted such Series B Preferred Stock until immediately prior to the
closing of such sale of securities.

                           (c)      CONVERSION PRICE. The Conversion Price of
the Series B Preferred Stock shall equal $7.125.

                           (d)      STOCK ADJUSTMENTS. If at any time or from
time to time there shall be a recapitalization of the Common Stock (other than a
subdivision, combination or merger or sale of assets transaction provided for
elsewhere in this Subsection 3(d)) provision shall be made so that the holders
of the Series B Preferred Stock shall thereafter be entitled to receive upon
conversion of the Series B Preferred Stock the number of shares of stock or
other securities or property of the Corporation or otherwise, to which a holder
of Common Stock deliverable upon conversion would have been entitled on such
recapitalization. In any such case, appropriate adjustment shall be made in the
application of the provisions of this Subsection 3(d) with respect to the rights
of the holders of the Series B Preferred Stock after the recapitalization to the
end that the provisions of this Subsection 3(d) (including adjustment of the
Conversion Price then in effect and the number of shares purchasable upon
conversion of the Series B Preferred Stock) shall be applicable after that event
as nearly equivalent as may be practicable.

                           (e)      NO IMPAIRMENT. The Corporation will not, by
amendment of its Charter or through any reorganization, recapitalization,
transfer of assets, consolidation, merger, dissolution, issue or sale of
securities or any other voluntary action, avoid or seek to avoid the observance
or performance of any of the terms to be observed or performed hereunder by the
Corporation, but will at all times in good faith assist in the carrying out of
all the provisions of this Subsection 3(e) and in the taking, of all such action
as may be necessary or appropriate in order to protect the Conversion Rights of
the holders of the Series B Preferred Stock against impairment.

                           (f)      CERTIFICATE.

                                    (i)     No fractional shares shall be issued
         upon the conversion of any share or shares of the Series B Preferred
         Stock, and the number of shares of Common Stock to be issued shall be
         rounded to the nearest whole share.

                                        4

<PAGE>

                                    (ii)    Upon the occurrence of each
         adjustment or readjustment of the Conversion Price of Series B
         Preferred Stock pursuant to this Subsection 3(f)(ii), the Corporation,
         at its expense, shall promptly compute such adjustment or readjustment
         in accordance with the terms hereof and prepare and furnish to each
         holder of Series B Preferred Stock a certificate setting forth such
         adjustment or readjustment and showing in detail the facts upon which
         such adjustment or readjustment is based. The Corporation shall, upon
         the written request at any time of any holder of Series B Preferred
         Stock, furnish or cause to be furnished to such holder a like
         certificate setting forth (A) such adjustment and readjustment, (B) the
         Conversion Price for such series of Preferred Stock at the time in
         effect, and (C) the number of shares of Common Stock and the amount, if
         any, of other property which at the time would be received upon the
         conversion of a share of Series B Preferred Stock.

                  5.       CERTAIN NOTICES. In the event of any taking by the
Corporation of a record of the holders of any class of securities for the
purpose of determining the holders thereof who are entitled to (A) receive any
dividend (other than a cash dividend) or other distribution, any right to
subscribe for, purchase or otherwise acquire any shares of stock of any class or
any other securities or property, or to receive any other right, or (B) vote on
any reclassification or recapitalization of the outstanding shares of the
Corporation's Common Stock or merger or consolidation with or into any other
corporation or business entity or sale, lease or conveyance of all or a
substantial portion of the Corporation's property or business or liquidation,
dissolution or winding up of the Corporation, then the Corporation shall deliver
by overnight courier to each holder of Series B Preferred Stock, at least twenty
(20) days prior to the record date specified therein, a notice specifying the
dare on which any such record is to be taken and a description of the amount and
character of any such dividend, distribution or right or a description of any
such matter to be voted upon, as applicable.

                  6.       RESERVATION OF SHARES. The Corporation shall at all
times reserve and keep available out of its authorized but unissued shares of
Common Stock, solely for the purpose of effecting the conversion of the shares
of the Series B Preferred Stock, such number of its shares of Common Stock as
shall from time to time be sufficient to effect the conversion of all
outstanding shares of the Series B Preferred Stock; and if at any time the
number of authorized but unissued shares of Common Stock shall not be sufficient
to effect the conversion of all then outstanding shares of the Series B
Preferred Stock, in addition to such other remedies as shall be available to the
holder of such Preferred Stock, the Corporation will take such corporate action
as may, in the opinion of its counsel, be necessary to increase its authorized
but unissued shares of Common Stock to such number of shares as shall be
sufficient for such purposes, including, without limitation, engaging in best
efforts to obtain the requisite shareholder approval of any necessary amendment
to these articles.

                                        5

<PAGE>

                  7.       METHODS OF NOTICE. Any notice required to be given to
the holders of shares of Series B Preferred Stock shall be deemed upon its
actual delivery to the holders of Series B Preferred Stock, by mail, overnight
courier or other means at each shareholder's address as last provided by such
shareholders.

                  8.       PROTECTIVE PROVISIONS. In addition to any other
rights provided by statute or common law, so long as any shares of Series B
Preferred Stock are outstanding, the Corporation shall not without first
obtaining the approval (by vote or written consent, as provided by law) of the
holders of all of the then outstanding shares of Series B Preferred Stock:

                           (a)      alter or change the rights, preferences or
privileges of the shares of Series B Preferred Stock so as to affect adversely
the shares;

                           (b)      increase or decrease (other than by
redemption or conversion) the total number of authorized shares of Series B
Preferred Stock or issue any additional shares of Series B Preferred Stock;

                           (c)      except as provided in the Certificate of
Designations of the Series A Preferred Stock, authorize or issue, or obligate
itself to authorize or issue, any other equity security of any class or series,
including any other security convertible into or exercisable for any such equity
security having a preference over, or being on a parity with, the Series B
Preferred Stock with respect to voting, dividends, distributions or upon
liquidations;

                           (d)      declare or pay any dividend (including a
dividend payable in stock of the Corporation), make any distribution with
respect to, redeem, purchase or otherwise acquire (or pay into or set aside for
a sinking fund for such purpose) any share or shares of Preferred Stock or
Common Stock except as specifically authorized with respect to the Series A
Preferred Stock and the Series B Preferred Stock; or

                           (e)      effect any liquidation, dissolution or
winding up of the Corporation.

                                        6

<PAGE>

                  IN WITNESS WHEREOF, the Corporation has caused this
Certificate to be executed by its duly authorized officers of the Corporation
this 31st day of March, 2000.

                                   DIGITAL TRANSMISSION SYSTEMS, INC.

                                   By:_________________________________________

                                   Name:_______________________________________

                                   Title:______________________________________

Attest:

_____________________________
Name:________________________
         Secretary

                                        7

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