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                                                                    Exhibit 10.1


                              TAX SHARING AGREEMENT

                  This Tax Sharing Agreement (the "Agreement"), dated as of this
12th day of September, 2000, by and between Peter Kiewit Sons', Inc. ("PKS"), a
Delaware corporation and Kiewit Materials Company ("KMC"), a Delaware
corporation is entered into in connection with the Split-Off (as defined below).

                  WHEREAS, PKS has received an advance ruling from the Internal
Revenue Service regarding the tax-free nature of the Split-Off (as defined
below); and

                  WHEREAS, PKS and KMC desire to set forth their agreement on
the proper allocation among PKS and KMC (and certain of their subsidiaries and
affiliates) of federal, state, foreign, and local Taxes (as defined below) and
certain other matters;

                  NOW, THEREFORE, in consideration of their mutual promises, the
parties to this Agreement agree as follows:

                                    ARTICLE I
                                   DEFINITIONS

                  As used in this Agreement, the following terms shall have the
following meanings (except as specifically provided, such meanings to be equally
applicable to both the singular and the plural forms of the terms defined):

                  "Affiliate" means corporation, partnership or other entity
directly or indirectly controlled by a Party (except that neither KMC nor its
Affiliates shall constitute an Affiliate of PKS). Control for this purpose shall
mean the direct or indirect ownership of more than 50% of the voting equity of
such entity. In addition, Affiliates of KMC shall include Quality Ready Mix,
Inc., Apache Materials, L.L.C., and the KMC Nonfiling Entities. For purposes of
this Agreement, all Affiliates of KMC as of the Distribution Date shall be
considered Affiliates of KMC for all taxable periods prior to and including the
Distribution Date (including prior to the Restructuring).

                  "Code" means the Internal Revenue Code of 1986 (or, if
relevant, the Internal Revenue Code of 1954), as amended, or any successor
thereto, as in effect for the taxable period in question.

                  "Combined Group" means all the corporations (or entities
electing to be treated as an association taxable as a corporation) included in a
particular Combined Return.

                  "Combined Jurisdiction" means, for any taxable period, any
jurisdiction in which KMC or a KMC Affiliate is included in a combined, unitary,
consolidated, or similar Tax Return with PKS or a PKS Affiliate for State Income
Tax or Other Tax purposes.

                  "Combined Return" means any combined, unitary, consolidated,
or similar Tax Return used in the determination of a State Income Tax or Other
Tax liability with respect to which KMC or a KMC Affiliate is included with PKS
or a PKS Affiliate.



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                  "Combined State Income Tax Liability" means the State Income
Tax liability for a Combined Return.

                  "Consolidated Group" means the affiliated group of
corporations (within the meaning of Section 1504 of the Code) of which PKS or
any member of the PKS Group is or was a member and KMC or any member of the KMC
Group is or was a member.

                  "Controlled Debentures" is defined in the Ruling Request.

                  "Debenture Exchange" is defined in the Ruling Request.

                  "Distributing Debentures" is defined in the Ruling Request.

                  "Distributing Stock" is defined in the Ruling Request.

                  "Distribution Date" means the date determined by the PKS Board
of Directors as of which the tax-free pro rata distribution of KMC stock
comprising a part of the Split-Off shall be effected.

                  "Due Date" shall mean, with respect to any Tax Return or
payment of Taxes, the date on which such Tax Return or payment is required,
under applicable law, to be filed or remitted to the appropriate Taxing
Authority, taking into account any applicable extensions.

                  "Final Determination" shall mean the final resolution of
liability for any Tax for a taxable period, by (i) IRS Form 870 or 870-AD (or
any successor forms thereto), on the date of acceptance by or on behalf of the
IRS, or by a comparable form under the laws of other jurisdictions (on the date
of acceptance by the applicable Taxing Authority); except that a Form 870 or
870-AD, successor form, or comparable form that reserves (whether by its terms
or by operation of law) the right of the taxpayer to file a claim for refund
and/or the right of the Taxing Authority to assert a further deficiency shall
not constitute a Final Determination until such rights expire; (ii) a decision,
judgment, decree, or other order by a court of competent jurisdiction, which has
become final and unappealable; (iii) a closing agreement or accepted offer in
compromise under Section 7121 or Section 7122 of the Code, or comparable
agreements under the laws of other jurisdictions; (iv) any allowance of a refund
or credit in respect of an overpayment of Tax, but only after the expiration of
all periods during which such refund may be recovered (including by way of
offset) by the jurisdiction imposing such Tax; or (v) any other final
disposition, including by reason of the expiration of the applicable statute of
limitations.

                  "Foreign Income Taxes" means all Taxes based on income imposed
by a Taxing Authority other than the United States or, any state or local
jurisdiction within the United States.

                  "Income Taxes" means all federal, state, local and foreign
income Taxes or other Taxes based on income including, without limitation,
United States federal taxes imposed under Subtitle A of the Code and any state
or local franchise Taxes based on income. Income Taxes shall also include
related interest, penalties, or other additions to tax, or additional amounts
imposed by any Taxing Authority.

                  "Income Tax Returns" means Tax Returns relating to Income
Taxes.



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                  "Indemnified Party" is defined in Section 7.1.

                  "Indemnifying Party" is defined in Section 7.1.

                  "IRS" means the Internal Revenue Service.

                  "IRS Ruling" means the private letter ruling issued to PKS by
the IRS, dated May 23, 2000, with respect to certain federal Income Tax aspects
of the Split-Off.

                  "KMC Affiliate" means any corporation, partnership or other
entity more than 50% of the voting equity of which is owned, directly or
indirectly, by KMC. KMC Affiliate shall also include Quality Ready Mix, Inc.,
Apache Materials, L.L.C., and the KMC Nonfiling Entities. For purposes of this
Agreement, all KMC Affiliates as of the Distribution Date shall be considered a
KMC Affiliate for all taxable periods prior to and including the Distribution
Date (including prior to the Restructuring).

                  "KMC Group" means the group of corporations (or entities
electing to be treated as an association taxable as a corporation) that, after
the Distribution Date, will be members of the affiliated group of corporations
of which KMC is the common parent (within the meaning of Section 1504 of the
Code). For purposes of this Agreement, all members of the KMC Group immediately
after the Distribution Date shall be considered members of the KMC Group for all
taxable periods prior to and including the Distribution Date (including prior to
the Restructuring).

                  "KMC Nonfiling Entities" means Bell Cement Tools L.L.C. and
Granite Canyon Venture, and any other entity (other than Apache Materials,
L.L.C. or Quality Ready Mix, Inc.) less than or equal to 50% of the voting
equity interests of which is owned by KMC or a KMC Affiliate as of the
Distribution Date.

                  "Level 3 Group" shall have the meaning set forth in the
PKS/Level 3 Tax Sharing Agreement.

                  "Nebraska Tax Credit Program" means the Employment and
Investment Growth Act Project Agreements signed December 30, 1987 and March 21,
1996, between Level 3 Communications, Inc. and the State of Nebraska, as amended
in January 1999.

                  "New Distributing Debentures" is defined in the Ruling
Request.

                  "Other Tax" means all Taxes (including but not limited to
sales and use Taxes, payroll Taxes, and excise Taxes), other than Income Taxes
and Transfer Taxes.

                  "Other Tax Returns" means Tax Returns relating to Other Taxes.

                  "Party" means PKS or KMC, as appropriate, and "Parties" means
PKS and KMC.

                  "PKS Affiliate" means any corporation, partnership or other
entity more than 50% of the voting equity of which is owned directly or
indirectly by PKS, other than KMC or any KMC Affiliate.



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                  "PKS Group" means the group of corporations (or entities
electing to be treated as an association taxable as a corporation) that, after
the Distribution Date, will be members of the affiliated group of corporations
of which PKS is the common parent (within the meaning of Section 1504 of the
Code).

                  "PKS Shareholder Tax Indemnity Payment" is defined in Section
4.2 hereof.

                  "PKS/Level 3 Tax Sharing Agreement" means the Tax Sharing
Agreement entered into by Level 3 Communications, Inc. (formerly Peter Kiewit
Sons', Inc.) and PKS (formerly PKS Holdings, Inc.) dated March 26, 1998.

                  "RAR" means any revenue agent's report with respect to federal
Income Taxes or similar reports relating to State Income Taxes.

                  "Restructuring" means the transactions described in the Ruling
Request and any associated transactions completed as of March 1, 1999.

                  "Ruling Request" means the private letter ruling request filed
by PKS with the IRS on January 10, 2000, as supplemented from time to time with
respect to certain tax aspects of the Split-Off.

                  "Separate Return" means all Tax Returns used in the
determination of State Income Tax or Other Tax liability other than a Combined
Return.

                  "Short Taxable Year 2000" means the taxable year beginning on
the day after the Distribution Date.

                  "Split-Off" is the transfer to shareholders by PKS of all the
issued and outstanding common stock and securities of KMC in a transaction
intended to qualify as a tax-free pro rata distribution and as a tax-free
exchange under Sections 355 and 368(a)(1)(D) of the Code.

                  "Split-Off Taxes" means any corporate level Taxes or related
liabilities (other than Taxes incurred as a result of a breach of either Party's
obligations or representations under Section 4.1) incurred by or imposed on (or
deemed to be incurred by or imposed on) KMC, a KMC Affiliate, PKS, or a PKS
Affiliate as a result of the Split-Off or the Restructuring, including, without
limitation, (i) Income Taxes attributable to the failure of the Split-Off or the
Restructuring to qualify as tax-free transactions pursuant to the Code, or (ii)
federal Income Taxes attributable to the recognition of intercompany gains (as
defined in Treasury Regulation Section 1.1502-13) or excess loss accounts (as
defined in Treasury Regulation Section 1.1502-19), or any similar State Income
Taxes.

                  "State Income Taxes" means all state or local Income Taxes or
other state or local Taxes based on income including, without limitation, any
state or local franchise Taxes based on income. State Income Taxes shall also
include related interest, penalties, or other additions to tax, or additional
amounts imposed by any Taxing Authority.

                  "State Income Tax Return" means Tax Returns relating to State
Income Taxes.



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                  "Statement of Facts" means the Statement of Facts and
Representations for Opinion dated March 1, 1999 made in connection with
receiving the Tax Opinion.

                  "Taxes" means all taxes imposed, whether domestic or foreign,
and whenever imposed by a national, local, municipal, governmental, state,
federal, foreign, or other body (a "Taxing Authority"), and without limiting the
generality of the foregoing, shall include any net income, alternative or add-on
minimum tax, gross income, sales, use, ad valorem, gross receipts, value added,
franchise, profits, license, transfer, recording, withholding, payroll,
disability, employment, social security, unemployment insurance, excise,
severance, stamp, occupation, premium, property, windfall profit, custom duty,
or other tax, government fee or other like assessment or charge of any kind
whatsoever, together with any related interest, penalties, or other additions to
tax, or additional amount imposed by any such Taxing Authority.

                  "Tax Attributes" means any net operating loss, net capital
loss, investment tax credit, foreign tax credit, charitable deduction or any
other deduction, credit or attribute that could affect Taxes (including, without
limitation, deductions and credits related to alternative minimum Taxes).

                  "Taxing Authority" is defined in the definition of "Taxes."

                  "Tax Benefit" means a reduction in the Tax liability of a
taxpayer for any taxable period that arises, or may arise in the future, as a
result of any adjustment to, or addition or deletion of, a Tax Item in the
computation of the Tax liability of the taxpayer.

                  "Tax Controversy" is defined in Section 5.1(b).

                  "Tax Detriment" means an increase in the Tax liability of a
taxpayer for any taxable period that arises, or may arise in the future, as a
result of any adjustment to, or addition or deletion of, a Tax Item in the
computation of the Tax liability of the taxpayer.

                  "Tax Item" means any item of income, gain, loss, deduction,
credit, recapture of credit, or any other item which increases or decreases (or
may increase or decrease) Taxes paid or payable or affects Tax Attributes.

                  "Tax Opinion" means the legal opinion received in connection
with the Restructuring relating to certain tax aspects of the Restructuring.

                  "Tax Return" means any return, report, information return,
filing, questionnaire or other document filed or required to be filed, including
requests for extensions of time, filings made with estimated Tax payments,
claims for refund or amended returns that may be filed, for any taxable period
with any Taxing Authority in connection with any Tax or Taxes (whether or not a
payment is required to be made with respect to such filing).

                  "Taxable Year 1999" means the taxable period ending on
December 25, 1999 or December 31, 1999, as applicable.



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                  "Taxable Year 2000" means the taxable period ending on
December 30, 2000 or December 31, 2000, as applicable (other than the Short
Taxable Year 2000).

                  "Transfer Taxes" means any state, local or foreign Tax, other
than sales or use Tax, imposed in connection with a transfer of any type of
property.

                  "Treasury Regulation" means the temporary and final Income Tax
Regulations promulgated under the Code.


                                   ARTICLE II
                      PREPARATION AND FILING OF TAX RETURNS

                  Section 2.1. Manner of Filing. In the absence of PKS approval
and/or a controlling change in law or circumstance, all Income Tax Returns
relating to a taxable period ending on or before (or including) the Distribution
Date shall be prepared in a manner that is consistent with elections, accounting
methods, conventions and principles of taxation (collectively the "Tax
Practices") used for the most recent taxable periods for which Income Tax
Returns involving similar items have been filed. Notwithstanding the previous
sentence, such Tax Returns shall not be required to be prepared in a manner
consistent with the Tax Practices to the extent such elections, methods,
conventions, and principles are altered by any Final Determination. All State
Income Tax Returns or Other Tax Returns (including any amendments to any such
Tax Returns that are State Income Tax Returns or Other Tax Returns) relating to
a taxable period ending on or before or including the Distribution Date shall be
filed as a Separate Return or as a Combined Return consistent with the prior
year unless otherwise approved by PKS in its sole and absolute discretion. PKS
shall in its sole and absolute discretion determine the members of each Combined
Group.

                  Section 2.2. Taxable Year 2000 and Prior Taxable Year Federal
Income Tax Returns.

                   (a) PKS shall prepare and file, or cause to be prepared and
filed, on a timely basis, all Tax Returns for the Consolidated Group relating to
federal Income Taxes for the Taxable Year 2000. Such Tax Returns shall include
only Tax Items for the KMC Group for its taxable period ending on the
Distribution Date. Except for Tax Returns described in Section 2.2(f), on or
before the date that is 90 days prior to the Due Date for such Tax Returns, KMC
shall provide PKS with its pro-forma federal Income Tax Returns and supporting
schedules for its taxable period ending on the Distribution Date. No later than
10 business days following a request by PKS, KMC shall provide PKS with any
other information requested by PKS relating to Tax Items for any member of the
KMC Group for use by PKS in preparing such Consolidated Group Tax Returns. Upon
KMC's written request, PKS shall deliver to KMC for its review relevant portions
of (or applicable work papers relating to) such Tax Returns no later than the
date that is 10 business days prior to the Due Date for such returns.

                  (b) KMC shall prepare and file, or cause to be prepared and
filed, on a timely basis, all Tax Returns for the KMC Group relating to federal
Income Taxes for the taxable years beginning after the Distribution Date
(including the Short Taxable Year 2000).



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                  (c) KMC and the KMC Group shall fully cooperate with PKS and
shall provide PKS all information requested by PKS relating to the Tax Returns
described in Sections 2.2(a) and (e) (including, if necessary, providing
applicable signatures or powers of attorney). Information provided by KMC to PKS
for Tax Returns described in Section 2.2(a) shall be based on a closing of the
books method unless PKS consents in writing to the election under Treasury
Regulation Section 1.1502-76(b)(2)(ii) to ratably allocate Tax Items.

                  (d) Except as provided in this Article II, KMC shall prepare
and file or cause to be prepared and filed federal Income Tax Returns for KMC
Affiliates (other than Bell Cement Tools L.L.C. and Granite Canyon Venture) for
Taxable Year 2000. Notwithstanding anything contained in this Article II to the
contrary, PKS shall prepare and file or cause to be prepared and filed all
federal Income Tax Returns for PKS Affiliates for Taxable Year 2000.

                  (e) Subject to the PKS/Level 3 Tax Sharing Agreement, PKS
shall have the right to prepare and file, or cause to be prepared and filed, all
Tax Returns (including amended Tax Returns) for PKS, PKS Affiliates, KMC and KMC
Affiliates (other than Bell Cement Tools L.L.C., Granite Canyon Venture and
Quality Ready Mix, Inc.) relating to federal Income Taxes for taxable years
prior to Taxable Year 2000.

                  (f) PKS shall prepare and file, or cause to be prepared and
filed, all Tax Returns for the Consolidated Group relating to installments of
estimated federal Income Taxes for the Taxable Year 2000. KMC shall provide to
PKS all information requested by PKS that relates to KMC and is necessary for
the determination of such estimated Tax installments on or before the date that
is 15 business days prior to the Due Date for such Tax Returns.

                  Section 2.3. Taxable Year 1999 & Taxable Year 2000 and Prior
Taxable Year State Income and Foreign Income Tax Returns.

                  (a) Except for Tax Returns with respect to Combined
Jurisdictions as described in Section 2.3(b), PKS shall prepare and file, or
cause to be prepared and filed, all Tax Returns relating to State Income Taxes
or Foreign Income Taxes imposed on PKS or any PKS Affiliate, for Taxable Year
1999 and Taxable Year 2000 and all prior taxable years. Except for Tax Returns
with respect to Combined Jurisdictions as described in Section 2.3(b), KMC shall
prepare and file, or cause to be prepared and filed, all Tax Returns relating to
State Income Taxes or Foreign Income Taxes imposed on KMC or any KMC Affiliate
for Taxable Year 1999 and Taxable Year 2000 and all prior taxable years.

                  (b) Subject to the PKS/Level 3 Tax Sharing Agreement, for any
Combined Jurisdiction, PKS or a PKS Affiliate, as appropriate, shall prepare and
file, on a timely basis, all Combined Returns for the Taxable Year 1999 and
Taxable Year 2000 and all prior taxable years. Upon KMC's written request, PKS
or its Affiliate shall deliver to KMC for its review relevant portions of (or
applicable work papers relating to) such Tax Returns no later than the date that
is 10 days prior to the Due Date of any such Tax Return. Except for Tax Returns
described in Section 2.3(d), on or before the date that is 90 days prior to the
Due Date of any such Tax Return, KMC or a KMC Affiliate, as appropriate, shall
provide PKS or the appropriate PKS Affiliate with its Tax Returns and supporting
schedules requested by PKS or the PKS Affiliate for use in preparing the Tax
Return for such taxable years. In addition, no later than 10 business days
following a request by PKS, KMC or the appropriate KMC Affiliate shall provide
PKS or the

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appropriate PKS Affiliate all information requested by PKS or the appropriate
PKS Affiliate that is relevant to the preparation of such Tax Returns.

                  (c) With respect to the preparation and filing of any Tax
Return described in Section 2.3(a), (b) or (d), KMC and the KMC Affiliates shall
fully cooperate with PKS and the PKS Affiliates (including, if necessary,
providing applicable signatures and powers of attorney).

                  (d) PKS shall prepare and file, or cause to be prepared and
filed, all Tax Returns for the Combined Group relating to installments of
estimated State Income Taxes for the Taxable Year 2000. KMC shall provide to PKS
all information requested by PKS that relates to KMC and is necessary for the
determination of such estimated Tax installments on or before the date that is
15 business days prior to the Due Date for such Tax Returns.

                  Section 2.4. Federal Income, State Income and Foreign Income
Tax Returns for Taxable Periods Beginning After the Distribution Date. PKS shall
prepare and file, or cause to be prepared and filed, all Tax Returns relating to
federal Income Taxes, State Income Taxes or Foreign Income Taxes for PKS and for
any PKS Affiliate for all taxable periods beginning after the Distribution Date.
KMC shall prepare and file, or cause to be prepared and filed, all Tax Returns
relating to federal Income Taxes, State Income Taxes or Foreign Income Taxes for
KMC and for any KMC Affiliate for all taxable periods beginning after the
Distribution Date.

                  Section 2.5. Transfer and Other Tax Returns.

                  (a) Transfer Taxes - PKS shall prepare and file, or cause to
be prepared and filed, on a timely basis, all Tax Returns related to Transfer
Taxes imposed under applicable law on PKS or any PKS Affiliate for all transfers
by such entities, whether occurring before, on or after the Distribution Date.
KMC shall prepare and file, or cause to be prepared and filed, on a timely
basis, all Tax Returns related to Transfer Taxes imposed under applicable law on
KMC or any KMC Affiliate for all transfers by such entities, whether occurring
before, on or after the Distribution Date.

                  (b) Other Taxes - PKS and KMC shall prepare and file, or cause
to be prepared and filed, on a timely basis, all Tax Returns relating to Other
Taxes imposed under applicable law on PKS (or its Affiliates) or imposed under
applicable law on KMC (or its Affiliates), respectively, whether before, on or
after the Distribution Date except for the following:

                           (i) PKS shall prepare and file, or cause to be
prepared and filed, all Other Tax Returns relating to the Nebraska Tax Credit
Program.

                           (ii) With regards to excise or franchise Taxes
computed based on net worth, total assets or any variation thereof (other than
on the basis of income) which are included in a Combined Return, PKS or a PKS
Affiliate shall prepare and file or cause to be prepared and filed all Tax
Returns for Taxable Year 1999, Taxable Year 2000 and all prior years.


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                                   ARTICLE III
         PAYMENTS, DEFICIENCIES, INDEMNIFICATION, REFUNDS AND OTHER TAX
                                   ATTRIBUTES

                  Section 3.1. Allocation and Payment. Except as expressly
provided herein, payment of Taxes to Taxing Authorities and payments between the
Parties in respect of Taxes or related matters, as the case may be, shall be
made in accordance with the allocations provided in this Agreement.

                  Section 3.2. Federal Income Taxes.

                  (a) Except as otherwise provided herein, for each taxable
period ending on or before (or each taxable period including) the Distribution
Date, the Consolidated Group's federal Income Tax liability (including estimated
Taxes and subsequently determined deficiencies in such Tax liability) shall be
allocated by PKS between the PKS Group and the KMC Group as set forth in (i)
through (iii) below.

                           (i) KMC Group Tax Liability. As reasonably determined
by PKS, the KMC Group's allocable share of the Consolidated Group federal Income
Tax liability shall equal the federal Income Tax computed by taking into account
Tax Items of the KMC Group as if the KMC Group filed its own stand-alone
consolidated federal Income Tax Return.

                           (ii) PKS Group Tax Liability. The PKS Group's
allocable share of the Consolidated Group federal Income Tax liability shall
equal the excess of the Consolidated Group federal Income Tax liability over the
sum of (A) the KMC Group allocable share of such liability, as determined under
Section 3.2(a)(i) above, plus (B) any such federal Income Tax liability
allocable to the Level 3 Group or any other entity that is not a member of the
PKS Group or the KMC Group pursuant to the PKS/Level 3 Tax Sharing Agreement.

                           (iii) Prior Allocation. If a deficiency or refund in
the Consolidated Group's federal Income Tax liability is subsequently proposed
or determined, for purposes of this Section 3.2, it shall be assumed for tax
years prior to Taxable Year 1999 that (A) any allocation of the Consolidated
Group's federal Income Tax liability made prior to the date of this Agreement
between the Parties was consistent with this Section 3.2 and (B) any obligations
between the Parties in respect of such allocation have been fully satisfied.

                  (b) Except as otherwise provided herein, for each taxable
period ending on or before (or each taxable period including) the Distribution
Date, KMC and the members of the KMC Group shall pay and be solely responsible
for any federal Income Taxes (including estimated Taxes) that are allocable
under this Agreement to KMC and the members of the KMC Group. KMC shall
indemnify PKS and the PKS Affiliates for and hold them harmless from any such
Taxes. Except as otherwise provided herein, for each taxable period ending on or
before (or each taxable period including) the Distribution Date, PKS shall pay
and be solely responsible for any federal Income Taxes (including estimated
Taxes) that are allocable under this Agreement to PKS and the members of the PKS
Group. Except as otherwise provided herein, PKS shall indemnify KMC and all
members of the KMC Group for and hold them harmless from any such Taxes.



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                  (c) KMC shall pay, or cause to be paid, on a timely basis, and
shall indemnify PKS and its Affiliates from all federal Income Tax imposed on
Quality Ready Mix, Inc. for all taxable years.

                  Section 3.3. State Income Taxes.

                  (a) For each taxable period ending on or before (or each
taxable period including) the Distribution Date for which the liability of the
members of the PKS Group and the KMC Group (and, if applicable, the Level 3
Group) is determined on a Combined Return, the Combined State Income Tax
Liability including estimated Taxes and subsequently determined deficiencies in
such Taxes, shall be allocated between the Parties as set forth below:

                           (i) PKS Group: The PKS Group's allocable share of the
Combined State Income Tax Liability in each Combined Jurisdiction shall be equal
to the excess of the Combined State Income Tax Liability over the sum of (A) KMC
Group Pro-Forma Liability as determined in Section 3.3 (a) (ii), plus (B) any
Combined State Income Tax Liability allocable to the Level 3 Group and any other
entity that is not a member of the PKS Group or the KMC Group pursuant to the
PKS/Level 3 Tax Sharing Agreement.

                           (ii) KMC Group: The KMC Group's allocable share of
the Combined State Income Tax Liability in each applicable state shall be equal
to the "KMC Group Pro-Forma Liability". The "KMC Group Pro-Forma Liability"
shall equal the pro-forma liability of the KMC Affiliates included in the
Combined Return computed utilizing the Combined Return apportionment factor
(e.g., in the case where a member of the Level 3 Group is included in the
Combined Return, the "Combined State Income Tax Return" apportionment factor as
provided in the PKS/Level 3 Tax Sharing Agreement) and all applicable Tax Items
on a pro-forma basis (as reasonably determined by PKS); provided, however, to
the extent Tax Items included in the KMC Group Pro-Forma Liability are not
utilized in the Combined Return (or if applicable the "Combined State Income Tax
Return" as defined in the PKS/Level 3 Agreement), these Tax Items shall be
excluded from the KMC Group Pro-Forma Liability computation. If such pro-forma
computation results in a negative KMC Group Pro-Forma Liability, PKS shall pay
KMC only to the extent PKS realizes a Tax Benefit from the Combined Jurisdiction
or receives payment from the Level 3 Group (in each case relating to the Tax
Items causing the negative KMC Group Pro-Forma Liability). If such pro-forma
computation results in a KMC Group Pro-Forma Liability greater than the Combined
State Income Tax Liability (reduced by any such liability allocable to the Level
3 Group and any other entity that is not a member of the PKS Group or the KMC
Group pursuant to the PKS/Level 3 Tax Sharing Agreement), the KMC Group's
allocable share of the Combined State Income Tax Liability shall be 100% and any
excess of such KMC Group Pro-forma Liability over the Combined State Income Tax
Liability (reduced by any such liability allocable to the Level 3 Group and any
other entity that is not a member of the PKS Group or the KMC Group pursuant to
the PKS/Level 3 Tax Sharing Agreement) shall be paid by the KMC Group to the PKS
Group.

                   (b) Except as otherwise provided herein, for each taxable
period ending on or before (or each taxable period including) the Distribution
Date, KMC and the members of the KMC Group shall be solely responsible for any
State Income Taxes that are allocable under Section 3.3(a) to KMC or any of the
members of the KMC Group. KMC and the members of the KMC Group shall indemnify
PKS and the PKS Affiliates for and hold them harmless from any


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such Taxes. Except as otherwise provided herein, for each taxable period ending
on or before (or each taxable period including) the Distribution Date, PKS and
the members of the PKS Group shall be solely responsible for any State Income
Taxes that are allocable under Section 3.3(a) to PKS or any of the members of
the PKS Group. Except as otherwise provided herein, PKS and the members of the
PKS Group shall indemnify KMC and all members of the KMC Group for and hold them
harmless from any such Taxes.

                  (c) Except as otherwise provided herein, for each taxable
period ending on or before (or each taxable period including) the Distribution
Date, KMC and the members of the KMC Group shall be solely responsible for the
payment of all State Income Taxes imposed upon or attributable to KMC or any of
its Affiliates (other than State Income Taxes owing to Combined Jurisdictions).
KMC and the members of the KMC Group shall indemnify PKS and all PKS Affiliates
for any such Taxes.

                  (d) Except as otherwise provided herein, for each taxable
period (or portion thereof) ending on or before (or each taxable period
including) the Distribution Date, PKS shall be solely responsible for the
payment of all State Income Taxes imposed upon or attributable to PKS or any of
its Affiliates (other than State Income Taxes owing to Combined Jurisdictions).
PKS and the members of the PKS Group shall indemnify all members of the KMC
Group for any such Taxes.

                  (e) If a deficiency or refund in a Combined State Income Tax
Liability is subsequently proposed or determined, for purposes of this Section
3.3, it shall be assumed for tax years prior to Taxable Year 1999 that (A) any
allocation of the Combined State Income Tax Liability made prior to the date of
this Agreement between the Parties was consistent with this Section 3.3 and (B)
any obligations between the Parties in respect of such allocation have been
fully satisfied. Any increase or decrease in Combined State Income Tax
Liability, to the extent that it reflects a percentage settlement of multiple
proposed deficiencies or overpayments, shall be allocated between the groups in
proportion to the manner in which the settled deficiencies or overpayments would
have been allocated if settled for the full amount of such deficiencies or
overpayments.

                  (f) Notwithstanding anything contained in this Article III to
the contrary, in the event that a state Final Determination results in a
Combined Group where a Combined State Income Tax Return was not filed as the
original Tax Return, and if such combination of entities results in a greater
State Income Tax liability than if such entities had not been combined, then
neither the PKS Group nor the KMC Group shall be allocated any lesser amount of
the Combined State Income Tax Liability resulting from such state Final
Determination than such group's "Non-Combined Liability". Each group's
"Non-Combined Liability" shall equal the aggregate amount of State Income Tax
that all members of such group would have paid to such state for such year had
such members not been combined but taking into account all other adjustments to
Tax Items reflected in the state Final Determination as if included in the
original Tax Returns filed in such state for such year.

                  (g) If a Tax Return or Final Determination consists of or
involves a member of the Level 3 Group and a member of the KMC Group (not
including members of the PKS Group), all Taxes allocated to the "Kiewit Group"
as defined in the PKS/Level 3 Tax Sharing Agreement shall be allocated to the
KMC Group pursuant to this Agreement.



                                       11
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                  Section 3.4. Transfer Taxes and Other Taxes.

                  (a) Except as provided in Section 3.4(b), for each taxable
period ending on or before (or each taxable period including) the Distribution
Date, PKS and its Affiliates shall be solely responsible for the payment of (and
shall indemnify and hold KMC and its Affiliates harmless from) all Transfer
Taxes or Other Taxes imposed on PKS or any PKS Affiliate. For each taxable
period ending on or before (or each taxable period including) the Distribution
Date, KMC and its Affiliates shall be solely responsible for the payment of (and
shall indemnify and hold PKS and its Affiliates harmless from) all Transfer
Taxes or Other Taxes imposed on or incurred by KMC or any KMC Affiliate.

                  (b) In the event that a Transfer Tax or Other Tax arises from
a transaction between PKS or any PKS Affiliate on the one hand, and KMC or any
KMC Affiliate, on the other hand, the recipient of property or service in such
transaction shall be liable for payment of (and shall indemnify and hold the
other Party and its Affiliates harmless from) all such Transfer Taxes or Other
Taxes.

                  Section 3.5. Split-Off Taxes. Notwithstanding anything
contained in this Agreement to the contrary (except as provided in Sections 4.3,
4.4, 7.14, and 7.17), 100% of any Split-Off Taxes shall be allocated to KMC, and
KMC shall be solely responsible for, and shall indemnify and hold the PKS and
its Affiliates harmless from, such Split-Off Taxes.

                  Section 3.6. Payment to PKS or KMC for Taxes With Respect to
Taxable Year 1999 and Taxable Year 2000.

                  (a) Federal Income Taxes. For the Taxable Year 1999 and
Taxable Year 2000, within 5 business days of notification by PKS or as otherwise
provided in this Section 3.6, KMC shall pay to PKS an amount equal to (i) the
allocable federal Income Tax liability of the members of the KMC Group for each
applicable year determined under this Article III, less (ii) estimated Tax
deposits paid by the KMC Group to PKS or the PKS Group in respect of such Tax
liability for each applicable year.

                  (b) State Income Taxes. For the Taxable Year 1999 and Taxable
Year 2000, in accordance with Section 3.6 (e), KMC shall pay to PKS an amount
equal to (i) the allocable Combined State Income Tax liability of the KMC Group
for each applicable year determined under this Article III for each state, less
(ii) estimated Tax deposits paid by the KMC Group to PKS in respect of such Tax
liability for each state for each applicable year.

                  (c) Estimated Federal Income Tax Payments for the Consolidated
Group. For the Taxable Year 1999 and the Taxable Year 2000, PKS shall determine
and notify KMC on or before September 30, 2000 of the amount of the estimated
Consolidated Group federal Income Tax due that is allocable to the KMC Group
under this Article III, and KMC shall, on or before September 30, 2000, pay to
PKS the amount so determined for the Taxable Year 1999 and the first, second and
third quarter of Taxable Year 2000. On or before November 15, 2000, PKS shall
redetermine the KMC Group's allocable share of the estimated Consolidated
Group's federal Income Tax liability for the Taxable Year 2000 as provided
herein and, if such share is greater or less than the amount of payments
previously paid by KMC to PKS pursuant to this Section 3.6(c),


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then KMC or PKS, as the case may be, shall pay such difference to the other
within 5 business days of notification by PKS. Prior to the Due Date for the
Consolidated Group's federal Income Tax Return for the Taxable Year 2000, PKS
shall redetermine the KMC Group's allocable share of the Consolidated Group's
federal Income Tax liability for the Taxable Year 2000 under this Article III
and, if such share is greater or less than the amount of payments previously
paid by KMC to PKS pursuant to this Section 3.6(c), as previously adjusted
pursuant to this Section 3.6(c), then KMC or PKS, as the case may be, shall pay
to the other the difference as soon as reasonably practicable after PKS makes
such determination and in no event later than such Due Date.

                  (d) Estimated Federal Income Tax Payments for Quality Ready
Mix, Inc. For the Taxable Year 2000, KMC shall cause Quality Ready Mix, Inc. to
pay its estimated federal Tax installment payments.

                  (e) Estimated State Income Tax Payments for Combined Returns.
On or prior to the Split-Off, PKS shall determine the amount of, and KMC shall
pay to PKS, the estimated Combined State Income Tax Liability that is allocable
to the KMC Group as computed pursuant to Article III for the Taxable Year 1999
and the Taxable Year 2000. Upon the filing of the Combined Returns for the
Taxable Year 1999 and the Taxable Year 2000, PKS shall redetermine the KMC
Group's allocable share of the Combined State Income Tax Liability for such
years and, if such share is greater or less than the amount of the payments
previously paid by KMC to PKS pursuant to this Section 3.6 (e), then KMC or PKS,
as the case may be, shall pay to the other the difference within 5 business days
of notification by PKS to KMC of such difference.

                  Section 3.7. Liability for Taxes and Refunds of Taxes for
Periods Beginning After the Distribution Date. Unless otherwise provided in this
Agreement, PKS or the appropriate PKS Affiliate shall pay to the appropriate
Taxing Authority and be responsible for all Taxes and shall be entitled to
receive and retain all refunds of Taxes with respect to taxable periods
beginning after the Distribution Date that are imposed upon or are attributable
to PKS or the PKS Affiliate. Unless otherwise provided in this Agreement, KMC or
the appropriate KMC Affiliate shall pay to the appropriate Taxing Authority and
be responsible for all Taxes and shall be entitled to receive and retain all
refunds of Taxes with respect to taxable periods beginning after the
Distribution Date that are imposed upon or are attributable to KMC or the KMC
Affiliate.

                  Section 3.8. Tax Attributes.

                  (a) Tax Attributes determined on a consolidated federal Income
Tax basis for taxable periods ending on or before (or taxable periods including)
the Distribution Date shall be allocated by PKS to PKS (and its Affiliates), on
the one hand, and KMC (and its Affiliates), on the other hand, in any reasonable
manner in accordance with the Code and the Treasury Regulations promulgated
thereunder. PKS and KMC hereby agree to compute their federal Income Tax
liabilities for taxable periods beginning after the Distribution Date consistent
with that computation and allocation. The capital loss carryforward from the
Consolidated Group 1998 federal Income Tax Return as filed, is attributable
entirely to members of the PKS Group and will be allocated entirely to the PKS
Group.

                  (b) Tax Attributes determined on a Combined Return basis for
taxable periods ending on or before (or taxable periods including) the
Distribution Date shall be allocated by PKS to PKS (and its Affiliates), on the
one hand, and KMC (and its Affiliates), on the other hand, in


                                       13
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any reasonable manner in accordance with applicable state or foreign law or
regulation. PKS and KMC hereby agree to compute their Tax liabilities for
taxable periods beginning after the Distribution Date consistent with that
determination and allocation.

                  Section 3.9. Refunds. With respect to any taxable period that
ends on or before (or any taxable period that includes) the Distribution Date,
PKS and the PKS Affiliates shall be entitled to retain or be paid all refunds of
Tax received whether in the form of payment, offset against other liabilities or
otherwise, from any Tax Authority to the extent the refund is attributable to
PKS or its Affiliates. With respect to any taxable period that ends on or before
(or any taxable period that includes) the Distribution Date, KMC and the KMC
Affiliates shall be entitled to retain or be paid all refunds of Tax received
whether in the form of payment, offset against other liabilities or otherwise,
from any Tax Authority to the extent the refund is attributable to KMC or its
Affiliates. Notwithstanding anything contained in this Section 3.9, in the case
of refunds of Tax (in whatever form) in connection with a Consolidated Group or
from Combined Returns, such refunds of Tax shall be allocated pursuant to
Section 3.2 and 3.3, as appropriate.

                  Section 3.10. PKS Carrybacks. Notwithstanding anything
contained in Section 3.9 to the contrary, PKS shall be entitled to any refund
for any Tax or any benefit arising from a Tax Attribute obtained by the
Consolidated Group (or any member of a Combined Group in a Combined
Jurisdiction) as a result of the carryback of losses or credits of any member of
the PKS Group from any taxable period beginning after the Distribution Date to
any taxable period ending on or before (or any taxable period including) the
Distribution Date. Any such refund received by KMC or any KMC Affiliate (by
refund, offset against other Taxes or otherwise), net of any Tax cost incurred
by KMC or an KMC Affiliate resulting from such refund, shall be paid by KMC to
PKS within 10 business days after such receipt from a Taxing Authority. The
application of any such carrybacks by PKS and/or any PKS Affiliate shall be in
accordance with the Code and the consolidated return Treasury Regulations
promulgated thereunder or applicable state or Other Tax laws.

                  Section 3.11. KMC Carrybacks. Notwithstanding anything
contained in Section 3.9 to the contrary, provided PKS consents in writing
(which consent shall be in PKS' sole and absolute discretion) to the carryback,
KMC shall be entitled to any refund for any Tax or any benefit arising from a
Tax Attribute obtained by the Consolidated Group (or any member of a Combined
Group in a Combined Jurisdiction) as a result of the carryback of losses or
credits of any member of the KMC Group from any taxable period beginning after
the Distribution Date to any taxable period ending on or before (or any taxable
period including) the Distribution Date. The application of any such carrybacks
by KMC and/or any KMC Affiliate shall be in accordance with the Code and the
consolidated return Treasury Regulations promulgated thereunder or applicable
state or Other Tax laws. KMC shall indemnify PKS for any interest, fines and
penalties resulting from the carryback of any item under this section.



                                       14
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                                   ARTICLE IV
          RESTRICTIONS ON POST-SPLIT-OFF TRANSACTIONS, REPRESENTATIONS
                         AND INDEMNIFICATION OBLIGATIONS

                  Section 4.1. Restrictions on Each Party's Ability to Undertake
Certain Post-Split-Off Transactions; Representations.

                  (a) KMC agrees that it will not (and it will not permit any
KMC Affiliate to) enter into or engage in any transaction or arrangement that
would (i) result in a failure to comply with any representation or statement set
forth in Exhibit A, or (ii) make any such representation or statement inaccurate
or misleading. All of the representations and statements set forth in Exhibit A
are complete and accurate as of the date hereof and will be complete and
accurate as of the Distribution Date. All of the representations and statements
pertaining to KMC and its Affiliates set forth in the Statement of Facts were
complete and accurate as of March 1, 1999. All facts pertaining to KMC and all
facts pertaining to its Affiliates as set forth in the Ruling Request are
complete and accurate as of the date hereof and will be complete and accurate as
of the Distribution Date. All facts pertaining to KMC and all facts pertaining
to its Affiliates as set forth in the Statement of Facts were complete and
accurate as of March 1, 1999. KMC agrees that, following the Split-Off, it will
not (and it will not permit any KMC Affiliate to) enter into or engage in any
transaction or arrangement that would cause all or part of the Restructuring or
Split-Off to become taxable, in whole or in part, for federal or State Income
Tax purposes. As of the Distribution Date, the management of KMC does not have
any plan or intention (and is not aware of any person having a plan or
intention) to enter into any transaction after the Distribution Date that may
result in PKS or any PKS Affiliate recognizing gain as a result of Section
355(e) of the Code. KMC shall not enter into or engage in (or permit) any
transaction or series of transactions where such transaction or transactions may
result in PKS or any PKS Affiliate recognizing gain as a result of Section
355(e) of the Code.

                  (b) PKS agrees that it will not (and it will not permit any
PKS Affiliate to) enter into or engage in any transaction or arrangement that
would (i) result in a failure to comply with any representation or statement set
forth in Exhibit B, or (ii) make any such representation or statement inaccurate
or misleading. PKS agrees that, following the Split-Off, it will not (and it
will not permit any PKS Affiliate to) enter into or engage in any transaction or
arrangement that would cause all or part of the Restructuring or Split-Off to
become taxable, in whole or in part, for federal or State Income Tax purposes.
All of the representations and statements set forth in Exhibit B are complete
and accurate as of the date hereof and will be complete and accurate as of the
Distribution Date. All representations and statements pertaining to PKS and its
Affiliates set forth in the Statement of Facts were complete and accurate as of
March 1, 1999. All facts pertaining to PKS and all facts pertaining to its
Affiliates set forth in the Ruling Request are complete and accurate as of the
date hereof and will be complete and accurate as of the Distribution Date. All
facts pertaining to PKS and all facts pertaining to its Affiliates as set forth
in the Statement of Facts were complete and accurate as of March 1, 1999.

                  (c) Notwithstanding Section 4.1(a) and (b), a Party may enter
into or engage in any transaction or arrangement referred to in this Section 4.1
if (i) the other Party expressly consents in writing in advance of such
transaction or arrangement, or (ii) the Party entering into or engaging in such
transaction or arrangement, at its own expense, obtains a supplemental private
letter ruling from the IRS or an opinion from a nationally recognized
independent tax advisor,


                                       15
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which ruling or opinion and tax advisor are reasonably satisfactory to the other
Party, stating that (x) in the case of the Split-Off, such transaction or
arrangement will not have any adverse impact on the qualification or tax
consequences of the Split-Off under Sections 355 and 368 of the Code and
corresponding state tax provisions (and will not have any adverse impact on the
tax consequences of the Split-Off under other applicable sections of the Code
and corresponding state tax provisions and will not result in the Split-Off
being taxable in whole or in part as a result of Section 355(e) of the Code, or
otherwise), and (y) in the case of the Restructuring, such transaction or
arrangement will not cause any step of the Restructuring to be taxable in whole
or in part for federal or State Income Tax purposes.

                  Section 4.2. KMC's Tax Indemnification of PKS. Notwithstanding
any other provision of this Agreement to the contrary (other than Sections 4.4,
7.14 and 7.17), (i) if KMC or any KMC Affiliate takes any action that is
prohibited under Section 4.1(a) or breaches of any representations, statements
or facts contained or referenced in Section 4.1(a) or (ii) if any of the
representations, statements or facts contained or referenced in Section 4.1(a)
are determined to be incomplete, inaccurate or misleading as of the applicable
date, KMC shall pay all Taxes imposed on PKS or any PKS Affiliate (and related
costs and expenses) caused by such action or incomplete, inaccurate or
misleading representation, statement or fact and shall indemnify and hold
harmless PKS and any PKS Affiliate from and against all such Taxes (and related
costs and expenses), including but not limited to any such Taxes paid at any
time by PKS or any PKS Affiliate. KMC shall make such payment and
indemnification no later than 10 business days after written notice from PKS
that a payment will be due pursuant to a Final Determination (or any earlier
judicial decision that is not a Final Determination) with respect to such Taxes,
which notice shall be accompanied by a computation of the amounts due. If, as a
result of any such action or incomplete, inaccurate or misleading
representation, statement or fact, PKS or any PKS Affiliate becomes legally
obligated to make a payment (a "PKS Shareholder Tax Indemnity Payment") to
shareholders who participated in the Split-Off and such PKS Shareholder Tax
Indemnity Payment is required to be made as a result of the Split-Off
constituting in whole or in part a taxable transaction, then KMC shall be
required to indemnify PKS and hold PKS harmless for any PKS Shareholder Tax
Indemnity Payment. KMC shall make such payment no later than 10 business days
after written notice from PKS of a Final Determination with respect to any PKS
Shareholder Tax Indemnity Payment, which notice shall be accompanied by a
computation of the amounts due. PKS shall return to KMC any amounts paid to PKS
for Taxes and related costs and expenses under this Section 4.2 in connection
with a judicial decision (that is not a Final Determination) to the extent such
amounts, pursuant to a subsequent Final Determination, are returned by a Taxing
Authority to PKS.

                  Section 4.3. PKS's Tax Indemnification of KMC. Notwithstanding
any other provision of this Agreement to the contrary (other than Sections 4.4,
7.14 and 7.17), (i) if PKS or any member of the PKS Group takes any action that
is prohibited under Section 4.1(b), breaches any of the representations,
statements or facts contained or referenced in Section 4.1(b), or (ii) if any of
the representations, statements or facts contained or referenced in Section
4.1(b) are determined to be incomplete, inaccurate or misleading, PKS shall pay
any Taxes imposed on any member of the KMC Group caused by such action and shall
indemnify and hold harmless each member of the KMC Group from and against all
such Taxes (and related costs and expenses), including but not limited to any
such Taxes (and related costs and expenses) paid at any time by any member of
the KMC Group. PKS shall make such payment and indemnification no later than 10


                                       16
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business days after written notice from KMC of a Final Determination with
respect to such Taxes, which notice shall be accompanied by a computation of the
amounts due.

                  Section 4.4. Inaccurate Representations, Statements, Facts. If
it is determined that (i) there are one or more representations or statements in
Exhibit A (or one or more facts in the Ruling Request pertaining to KMC or its
Affiliates) that are inaccurate or incomplete and such inaccurate or incomplete
facts, representations or statements caused the Split-Off to fail to qualify
under Sections 355 or 368 of the Code (or caused the Split-Off to be taxable in
whole or in part) and, (ii) there are one or more representations in Exhibit B
(or one or more facts in the Ruling Request pertaining to PKS or its Affiliates)
that are inaccurate or incomplete and such inaccurate or incomplete facts,
representations or statements caused the Split-Off to fail to qualify under
Sections 355 or 368 of the Code (or caused the Split-Off to be taxable in whole
or in part), then each Party shall bear and be responsible for (and indemnify
the other Party for) its share of Taxes, costs and liabilities or other payments
caused by such inaccurate or incomplete facts, representations or statements. If
it is determined that (i) there are one or more representations, statements or
facts contained in the Statement of Facts pertaining to KMC or its Affiliates
that are inaccurate or incomplete and such inaccurate or incomplete facts,
representations or statements caused the Restructuring to be taxable in whole or
in part and, (ii) there are one or more representations, statements or facts
contained in the Statement of Facts pertaining to PKS or its Affiliates that are
inaccurate or incomplete and such inaccurate or incomplete facts,
representations or statements caused the Restructuring to be taxable in whole or
in part, then each Party shall bear and be responsible for (and indemnify the
other Party for) its share of Taxes, costs and liabilities or other payments
caused by such inaccurate or incomplete facts, representations or statements. If
it is determined that there are one or more representations, statements or facts
contained in the Statement of Facts or the Ruling Request pertaining to both KMC
or its Affiliates and PKS or its Affiliates and such representations, statements
or facts are determined to be inaccurate or incomplete as to both, then each
Party shall bear and be responsible for (and indemnify the other Party for) its
share of Taxes, costs and liabilities or other payments caused by such
inaccurate or incomplete facts, representations or statements. For purposes of
this Section 4.4, a Party's share of such Taxes, costs and liabilities or other
payments shall be determined under Article 6 and shall be based on such Party's
relative fault in connection with the inaccurate or incomplete facts,
representations or statements.

                  Section 4.5. Breach. PKS shall indemnify and hold harmless
each member of the KMC Group and KMC shall indemnify and hold harmless each of
the member of the PKS Group from and against any payment required to be made by
the indemnified party, as the case may be, as a result of the breach by a member
of the PKS Group (or an Affiliate of PKS) or the KMC Group (or an Affiliate of
KMC), as the case may be, of any payment obligation under this Agreement.



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                                    ARTICLE V
            COOPERATION; MAINTENANCE AND EXCHANGE OF INFORMATION; TAX
                                 CONTROVERSIES

                  Section 5.1. Cooperation.

                  (a) PKS and KMC shall cooperate (and shall cause each of their
Affiliates to cooperate) fully at such time and to the extent reasonably
requested by the other Party in connection with (i) the preparation and filing
of any Tax Return, (ii) the conduct of any audit, dispute, proceeding, suit or
other Tax action concerning any issues or (iii) any other matter contemplated
hereunder. Such cooperation shall include, without limitation, the execution of
any document that may be necessary or reasonably helpful in connection with the
filing of any Tax Return by PKS, the PKS Affiliates, KMC, or the KMC Affiliates
(other than the KMC Nonfiling Entities), or in connection with any audit,
proceeding, suit, action or matter addressed in the preceding sentence. In
addition, each Party shall make its employees and facilities available on a
mutually convenient basis to facilitate such cooperation.

                  (b) Each Party shall provide prompt notice to the other Party
of any pending or threatened Tax controversy, including, without limitation, any
audit, any protest to any Taxing Authority or any litigation in Tax Court or any
other court of competent jurisdiction (a "Tax Controversy"), that (i) relates to
a Tax or Tax Attribute of the other Party or (ii) could give rise to the
liability of the other Party to make a payment pursuant to this Agreement (both
clauses (i) and (ii) of this Section 5.1(b) constituting a "Liability Issue" of
the other Party). PKS and KMC shall promptly furnish each other copies of any
inquiries or requests for information or other correspondence from any Taxing
Authority or any other administrative, judicial, or other governmental authority
concerning any such Liability Issue. Without limiting the generality of the
foregoing, PKS and KMC, as the case may be, shall each promptly furnish to the
other upon receipt of a copy of any RAR or similar report, notice of proposed
adjustment, or notice of deficiency received by PKS or any PKS Affiliate or by
KMC or any KMC Affiliate, as the case may be, and, if requested, all other
documents relating to any Liability Issue of the other Party. Notwithstanding
anything to the contrary contained in this Article V, PKS shall not be required
to provide to KMC or any KMC Affiliate copies of information document requests
received from any Taxing Authority during PKS's handling of any Tax Controversy
under Section 5.2(a).

                  (c) Each Party agrees to maintain all Tax Returns and related
workpapers, supporting schedules and other documentation that it prepared
concerning the other Party for nine (9) years following the Split-Off. Following
the Split-Off, KMC agrees to maintain any documents, workpapers, supporting
schedules or other information supporting all tax positions taken on the Tax
Returns of the Consolidated Group or any Combined Return for a period of nine
(9) years. Upon request by PKS, KMC agrees to provide such documents or
information to PKS. Neither Party shall be liable to the other Party (for
amounts other than the Tax) for failing to maintain the documents described in
this Section 5.1(c), to the extent such Party exercises the same care in
maintaining its own similar documents.



                                       18
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                  Section 5.2. Contest Provisions. In addition to the provisions
of Section 5.1:

                  (a) PKS shall control the handling of and may settle any Tax
Controversy (i) involving a Tax Return of the Consolidated Group or a Combined
Return or (ii) potentially affecting PKS or any of its Affiliates; provided,
however, KMC shall pay upon request reasonable fees to PKS for handling KMC
Liability Issues. At its election, KMC may at its sole cost participate in any
such proceedings to the extent the proceedings relate to a KMC Liability Issue.
The participation rights described in the previous sentence shall include
participation in all conferences, meetings or proceedings with any Taxing
Authority, the subject matter of which includes the KMC Liability Issue and
participation in the preparation of documentation, protests, memoranda of fact
and law and briefs with respect to the KMC Liability Issue.

                   (b) KMC shall control (and may settle) any Tax Controversy
pertaining solely to KMC but only if such controversy does not involve or relate
to a Consolidated Group or Combined Return. PKS shall control (and may settle)
any Tax Controversy pertaining to PKS or its Affiliates.

                  (c) In the event that any Taxing Authority proposes that
members of one Party's group be included in a unitary, combined or consolidated
return with members of the other Party's group with respect to a Tax Return that
was not filed as a Combined Return, such Tax Return shall be treated as a
Combined Return subject to the provisions of Section 5.2(a) for purposes of
determining control of such Tax Controversy.

                  (d) In the event of any Tax Controversy described in Section
5.2(a), PKS (or its Affiliates) in its sole and absolute discretion shall have
the right to extend the applicable statue of limitations.

                  Section 5.3. Earnings and Profits. PKS shall determine the
amount of PKS's earnings and profits that are properly allocated to the PKS
Group and the KMC Group at the time of the Split-Off under Treasury Regulation
Section 1.312-10.

                                   ARTICLE VI
                               DISPUTE RESOLUTION

                  Section 6.1. Good Faith Negotiation. In the event of any
dispute or disagreement relating to this Agreement, including, without
limitation, any dispute or disagreement with respect to the calculation or
allocation of liability for Taxes or Tax Attributes hereunder, the manner of
preparing any Tax Return or the meaning of any provision in this Agreement,
senior management of the Parties shall negotiate in good faith and attempt to
resolve the dispute or disagreement.

                  Section 6.2. Arbitration. In the event that senior management
is unable to resolve any dispute or disagreement pursuant to Section 6.1, and
such matter is not a matter that, under the terms of this Agreement, is to be
determined in the sole and absolute discretion of a particular Party, the
Parties shall submit the matter to an arbitration panel. The arbitration panel
shall be composed of three members: PKS and KMC shall each appoint one member
(who shall not be an employee, officer or director, professional consultant
(including, without limitation, outside attorney or accountant) or otherwise
related to the appointing party) within 15 days after the matter


                                       19
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has been submitted to arbitration. If either Party fails to appoint its
arbitrator within such 15 day period, the other Party may apply to the American
Arbitration Association (the "AAA") to appoint an arbitrator on behalf of the
Party that has failed to appoint its arbitrator. The two arbitrators appointed
by or on behalf of the Parties shall jointly appoint a third arbitrator who
shall chair the arbitration panel. If the two arbitrators cannot agree on a
third arbitrator, the third arbitrator shall be appointed by the AAA. The
arbitration proceedings shall take place in Chicago, Illinois, and shall be
conducted in accordance with the Commercial Arbitration Rules of the AAA. The
decision of the arbitration panel with respect to such dispute or disagreement
shall be final and binding on the Parties hereunder. All expenses of such
arbitration proceedings shall be allocated between PKS and KMC in proportion to
each Party's liability with respect to the issue submitted to arbitration.

                  Section 6.3. Timing of Payments. All amounts determined
pursuant to Sections 6.1 or 6.2 to be payable by one Party to the other shall be
due and payable on or before the date that is 10 business days after the
determination that such amount is payable.

                                   ARTICLE VII
                                  MISCELLANEOUS

                  Section 7.1. Timing of Certain Payments. Upon payment of any
Taxes with respect to which a Party is entitled to receive indemnification
hereunder, such receiving Party (the "Indemnified Party") shall send the other
Party (the "Indemnifying Party") a notice accompanied by evidence of payment and
a statement detailing the Taxes paid and describing in reasonable detail the
particular facts relating thereto. Unless a different deadline is expressly
provided herein, the Indemnifying Party shall (or shall cause one or more of its
Affiliates to) remit payment for Taxes for which the Indemnifying Party is
liable hereunder to the Indemnified Party (or one or more of its Affiliates) no
later than 30 business days after such notice is sent to the Indemnifying Party.
Unless otherwise provided herein, all other payments between the Parties shall
be due and payable on or before the date that is 30 business days after notice
requesting such payment is sent to the other Party.

                  Section 7.2. Net of Tax Benefits and Detriments. If any
Indemnified Party realizes a Tax Benefit or a Tax Detriment by reason of having
incurred any Tax or other amount for which such Indemnified Party is entitled to
receive indemnification hereunder (including a Tax Detriment realized by reason
of having received an indemnity payment hereunder with respect to such Tax),
then such Indemnified Party shall pay to the Indemnifying Party an amount equal
to the Tax Benefit, or such Indemnifying Party shall pay to such Indemnified
Party an additional amount equal to the Tax Detriment (taking into account any
Tax Detriment resulting from the receipt of such additional amounts), as the
case may be. In the event that, subsequent to such payment, any portion of such
Tax Benefit is disallowed or any portion of such Tax Detriment is refunded, the
amount paid by one Party to the other with respect to that portion of the Tax
Benefit or Tax Detriment shall be repaid to the other Party. The principles of
this Section 7.2 apply equally to nonindemnity payments made between the
Parties.

                  Section 7.3. Characterization of Payments. The Parties agree
to treat, and to cause their respective Affiliates to treat, where appropriate
(i) any payment (by one Party or its Affiliates to the other Party or its
Affiliates) required by this Agreement (other than a payment described in
Section 7.4 or reasonable fees described in Section 5.2(a)) as either a
contribution by PKS to KMC


                                       20
   21
or a distribution by KMC to PKS, as the case may be, occurring immediately prior
to the Split-Off and (ii) any payment of interest or Taxes (other than federal
Income Taxes) by or to a Taxing Authority as taxable or deductible, as the case
may be, to the Party entitled under this Agreement to retain such payment or
required under this Agreement to make such payment, in either case, except as
otherwise mandated by applicable law; provided, however, that in the event it is
determined as a result of a Final Determination that any such treatment is not
permissible, the payment between the Parties (including any indemnification
payment described in Section 7.2) shall be adjusted to place the Parties in the
same after-Tax position they would have been in had such Final Determination not
occurred. To the extent the Parties cannot be placed in the same after-Tax
position, the payment between the Parties shall be adjusted so that each Party
bears 50% of any Tax Detriment resulting from such Final Determination.

                  Section 7.4. Interest on Overdue Payments. Any payment that is
required to be made pursuant to this Agreement (i) by KMC (or a KMC Affiliate)
to PKS (or a PKS Affiliate) or (ii) by PKS (or a PKS Affiliate) to KMC (or a KMC
Affiliate), that is not made on or prior to the date that such payment is
required to be made pursuant to this Agreement shall thereafter bear interest at
the rate established for underpayments pursuant to Section 6621(a)(2) of the
Code plus three (3) percentage points, compounded daily.

                  Section 7.5. Payments by Wire Transfer. Any payment that is
required to be made pursuant to this Agreement (i) by KMC (or a KMC Affiliate)
to PKS (or a PKS Affiliate) or (ii) by PKS (or a PKS Affiliate) to KMC (or a KMC
Affiliate), shall be made by wire transfer of immediately available funds,
provided, however, that if the amount of any payment is less than $10,000, such
payment may be made in a form other than a wire transfer.

                  Section 7.6. Notices. Any notice, demand, claim or other
communication pursuant to this Agreement shall be in writing and shall be deemed
given upon delivery if delivered personally, upon the fifth day following the
date of mailing if sent by certified mail (return receipt requested and postage
prepaid) or upon completion of transmission if sent by telecopy or facsimile, to
the Parties at the following address:

PKS at:                    Peter Kiewit Sons', Inc.
                           1000 Kiewit Plaza
                           Omaha, Nebraska  68131
                           Attn:  Tax Department
                           Fax:  (402) 271-2983

KMC at:                    Kiewit Materials Company
                           3555 Farnam Street
                           Omaha, Nebraska  68131
                           Attn:  Tax Department
                           Fax:  (402) 536-3607



                                       21
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                  Section 7.7. Complete Agreement. This Agreement is subject to
the provisions of the PKS/Level 3 Tax Sharing Agreement and, except for such
agreement, constitutes the entire agreement of the Parties concerning the
subject matter hereof, and supersedes all other agreements, whether or not
written, in respect of any Tax as between or among PKS and its Affiliates, on
the one hand, and KMC and its Affiliates, on the other hand. This Agreement
shall not be amended except by agreement in writing signed by both Parties.

                  Section 7.8. Governing Law. This Agreement shall be governed
by and construed in accordance with, the laws of the State of Delaware.

                  Section 7.9. Successors and Assigns. A Party's rights and
obligations under this Agreement may not be assigned without the prior written
consent of the other Party. All of the provisions of this Agreement shall be
binding upon and inure to the benefit of the Parties and their respective
successors and permitted assigns.

                  Section 7.10. No Third-Party Beneficiaries. This Agreement is
solely for the benefit of the Parties to this Agreement and their respective
Affiliates (other than the KMC Nonfiling Entities) and should not be deemed to
confer upon third parties any remedy, claim, liability, reimbursement, claim of
action or other right in excess of those existing without this Agreement. PKS
shall indemnify KMC for any Taxes imposed on United Metro Materials Inc.
attributable to any deferred intercompany gain that may have been created in
1994 solely with respect to assets of United Metro Materials that were
transferred in such year to the PKS Group and remained with the PKS Group as of
the Distribution Date (i.e., the assets were not transferred back to KMC or its
Affiliates).

                  Section 7.11. Legal Enforceability. Any provision of this
Agreement that is prohibited or unenforceable in any jurisdiction shall, as to
that jurisdiction, be ineffective to the extent of the prohibition or
unenforceability without invalidating the remaining provisions. Any prohibition
or unenforceability of any provision of this Agreement in any jurisdiction shall
not invalidate or render unenforceable the provision in any other jurisdiction.

                  Section 7.12. Expenses. Unless otherwise expressly provided in
this Agreement, each Party shall bear any and all expenses that arise from their
respective obligations under this Agreement.

                  Section 7.13. Confidentiality. Each Party shall (and shall
cause its Affiliates to) hold and cause its consultants and advisors to hold in
strict confidence, unless compelled to disclose by judicial or administrative
process or, in the opinion of its counsel, by other requirements of law, all
information (other than any such information relating solely to the business or
affairs of such Party) concerning the other Party or its Affiliates hereto
furnished it by such other Party or its representatives pursuant to this
Agreement (except to the extent that such information can be shown to have been
(a) previously known by the Party to which it was furnished, (b) in the public
domain through no fault of such Party, or (c) later lawfully acquired from other
sources by the Party to which it was furnished), and each Party shall not
release or disclose such information to any other person, except its auditors,
attorneys, financial advisors, bankers and other consultants and advisors who
shall be advised of the provisions of this Section 7.13. Each Party shall be
deemed to have satisfied its obligation under this Section 7.13 if its exercises
the same care as it takes to preserve confidentiality for its own similar
information.



                                       22
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                  Section 7.14. No Double Recovery. Notwithstanding anything
contained herein to the contrary, no Party shall be entitled to indemnification
hereunder for any amount to the extent such Party has otherwise been reimbursed
hereunder (or otherwise) for such amount.

                  Section 7.15. Application to Subsidiaries. The Agreement is
entered into by PKS and KMC on behalf of themselves and each member of the PKS
Group and the KMC Group, respectively. This Agreement constitutes a direct
obligation of each such member.

                  Section 7.16. Descriptive Titles and Headings. Descriptive
titles and section headings used in this Agreement are for convenience and
reference only and shall not affect the construction of the Agreement.

                  Section 7.17. Assets or Divisions. Notwithstanding anything
contained in this Agreement to the contrary, KMC shall be liable for (and shall
indemnify PKS for) any Taxes imposed on PKS or its Affiliates to the extent such
Taxes are attributable to any assets that, on or prior to the Distribution Date,
were transferred to KMC or its Affiliates (including any Taxes caused by
recognition of deferred intercompany gains or excess loss accounts in connection
with the Split-Off or otherwise).






                           [Signatures on next page.]



                                       23
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                  This Agreement may be signed in two counterparts, each of
which shall be an original, with the same effect as if the signature thereto and
hereto were upon the same instrument.

                  IN WITNESS WHEREOF, the Parties have executed and delivered
this Agreement as of the date first above written.

Peter Kiewit Sons', Inc.

By: /s/ Kenneth E. Stinson
    ----------------------------------------
Title: Chairman of the Board and President
      --------------------------------------



Kiewit Materials Company

By: /s/ Christopher J. Murphy
    ----------------------------------------
Title: President and Chief Executive Officer
      --------------------------------------





                                       24
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                                    EXHIBIT A

(a)      Any indebtedness owed by KMC to PKS after the Split-Off will not
         constitute stock or securities.

(b)      The principal amount of the Controlled Debentures received in the
         Debenture Exchange will be equal to or less than the principal amount
         of the Distributing Debentures surrendered in exchange therefor.

(c)      Immediately after the Split-Off, at least 90 percent of the fair market
         value of the gross assets of KMC will consist of the stock of Tanner
         Companies (Yuma) Inc., United Metro Materials Inc., and Twin Mountain
         Rock Company, each of which is engaged in the active conduct of a trade
         or business under Section 355(b) of the Code.

(d)      The five years of financial information submitted to the IRS on behalf
         of KMC, Tanner Companies (Yuma) Inc., United Metro Materials Inc., and
         Twin Mountain Rock Company represents the present operations of each
         corporation and, with respect to each, there have been no substantial
         operational changes since the date of the last financial statements
         submitted.

(e)      Following the Split-Off, Tanner Companies (Yuma) Inc., United Metro
         Materials Inc., and Twin Mountain Rock Company each will continue the
         active conduct of its business, independently and with its separate
         employees.

(f)      The Split-Off is being carried out to allow certain key employees of
         KMC to acquire a meaningfully increased equity interest in the
         materials segment of PKS that reflects solely the performance of the
         materials segment of PKS' construction business. The Split-Off is
         motivated, in whole or substantial part, by this corporation business
         purpose.

(g)      There is no plan or intention to liquidate any of KMC, Tanner Companies
         (Yuma) Inc., United Metro Materials Inc., or Twin Mountain Rock
         Company, to merge any of these corporations with any other corporation
         or to sell or otherwise dispose of the assets of any of these
         corporations after the Split-Off.

(h)      KMC is not an investment company as defined in Section
         368(a)(2)(F)(iii) and (iv) of the Code.

(i)      The Split-Off is not part of a plan or series of related transactions
         (within the meaning of Section 355(e) of the Code) pursuant to which
         one or more persons will acquire, directly or indirectly, stock
         possessing 50 percent or more of the total combined voting power of all
         classes of stock of KMC entitled to vote, or stock possessing 50
         percent or more of the total value of all classes of stock of KMC.

(j)      There is no plan or intention by KMC, directly or through any
         subsidiary corporation, to purchase any of its outstanding stock after
         the Split-Off, other than through stock purchases meeting the
         requirements of section 4.05(1)(b) of Revenue Procedure 96-30, 1996-1
         C.B. 696.
   26
                                    EXHIBIT B

(a)      The principal amount of the New Distributing Debentures received in the
         Debenture Exchange will be equal to or less than the principal amount
         of the Distributing Debentures surrendered in exchange therefore.

(b)      Immediately after the Split-Off, at least 90 percent of the fair market
         value of the gross assets of PKS will consist of stock of Kiewit
         Construction Group Inc.

(c)      Immediately after the Split-Off, at least 90 percent of the fair market
         value of the gross assets of Kiewit Construction Group Inc. will
         consist of the stock of Kiewit Construction Company and Gilbert
         Southern Corp., each of which is engaged in the active conduct of a
         trade or business under Section 355(b) of the Code.

(d)      The five years of financial information submitted to the IRS on behalf
         of PKS, Kiewit Construction Group Inc., Kiewit Construction Company,
         and Gilbert Southern Corp. represents the present operations of each
         corporation and, with respect to each, there have been no substantial
         operational changes since the date of the last financial statements
         submitted.

(e)      The management of PKS, to its best knowledge, is not aware of any plan
         or intention on the part of any remaining shareholder or security
         holder of PKS, to sell, exchange, transfer by gift or otherwise dispose
         of any stock in, or securities of, PKS after the Split-Off (apart from
         sales of Distributing Stock or Distributing Debentures to PKS in
         connection with a holder's termination of employment with PKS and
         possible future conversions of Distributing Debentures or New
         Distributing Debentures, respectively).

(f)      Following the Split-Off, Kiewit Construction Company and Gilbert
         Southern Corp. each will continue the active conduct of its business,
         independently and with its separate employees.

(g)      There is no plan or intention to liquidate any of PKS, Kiewit
         Construction Group Inc., Kiewit Construction Company, or Gilbert
         Southern Corp., to merge any of these corporations with any other
         corporation or to sell or otherwise dispose of the assets of any of
         these corporations after the Split-Off, except for the possible
         distribution by Kiewit Construction Company of all of the stock of its
         two subsidiaries, Kiewit Western Co. and Kiewit Pacific Co., to Kiewit
         Construction Group Inc.

(h)      PKS is not an investment company as defined in Section
         368(a)(2)(F)(iii) and (iv) of the Code.