Document:

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                                                                  EXHIBIT 10.1.2

                              USS HOLDINGS, INC.

                              AMENDMENT NO. 2 TO

                            STOCKHOLDERS AGREEMENT

                          Dated as of October 6, 1998
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                               Table of Contents

<TABLE>
<S>                                                                                                      <C>
Section 1.   Definitions; Rules of Construction........................................................   1
Section 2.   Board of Directors; Adjustment EBITDA Targets.............................................  12
Section 3.   Financial Statements and Other Information, Inspections and Board Meetings................  15
Section 4.   Additional Voting Agreements; Required Sale...............................................  18
Section 5.   First Refusal Rights for Securities Issued by the Corporation.............................  21
Section 6.   Affiliate Transactions....................................................................  22
Section 7.   Issuance of Additional Securities to DGHA Stockholders and Manager Stockholders...........  22
Section 8.   Limitations on Transfers of Stock - General...............................................  23
Section 9.   Limitations on Transfers of Restricted Shares.............................................  23
Section 10   Limitations on Transfers prior to Third Anniversary.......................................  23
Section 11   Rights of First Refusal after Third Anniversary...........................................  24
Section 12   Rights of Co-Sale.........................................................................  25
Section 13   Drag-Along Rights.........................................................................  26
Section 14   Options Upon Termination Event............................................................  28
Section 15   Required Sale.............................................................................  32
Section 16   Regulatory Matters........................................................................  32
Section 17   Requisite Stockholder Approval............................................................  34
Section 18   Amendment and Waiver......................................................................  34
Section 19   Securities Law Compliance; Legends........................................................  34
Section 20   Duration of Agreement.....................................................................  36
Section 21   Severability..............................................................................  36
Section 22   Entire Agreement..........................................................................  37
Section 23   Certain Stockholders......................................................................  37
Section 24   Successors and Assigns....................................................................  37
Section 25   Counterparts..............................................................................  37
Section 26   Remedies..................................................................................  37
Section 27   Notices...................................................................................  38
Section 28   Governing Law.............................................................................  39
Section 29   Further Assurances........................................................................  39
Section 30   Jurisdiction; Venue; Process..............................................................  39
Section 31   Representation and Warranties of the Stockholders.........................................  39
Section 32   Conflicting Agreements....................................................................  41
Section 33   Mutual Waiver of Jury Trial...............................................................  41
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                                       i
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                                                     AMENDMENT NO. 2 dated as of
                                           October 6, 1998 ("Amendment No. 2"),
                                           among USS HOLDINGS, INC., a Delaware
                                           corporation (the "Corporation"), and
                                           the stockholders of the Corporation
                                           (each a "Stockholder" and
                                           collectively the "Stockholders")
                                           listed on the signature pages hereof,
                                           to the Stockholders Agreement (the
                                           "Agreement") dated as of February 9,
                                           1996, as amended, among the
                                           Corporation and the Stockholders.

          The parties hereto, being the parties to the Agreement required to
amend the Agreement in accordance with Section 18(a) thereof, hereby amend the
Agreement, which amendment shall become effective upon execution of this
Amendment No. 2 by the Corporation, a Majority of the Institutional Stockholders
and a Majority of the DGHA Stockholders, by deleting all of the text and
replacing it with the following:

     SECTION 1.  Definitions; Rules of Construction.
                 ----------------------------------

          (a)    Capitalized terms used in this Agreement have the meanings
     ascribed to them below:

          "Accounting Period" has the meaning ascribed to it in Section 3(a)(i).
           -----------------

          "Acquisition" means USS Acquisition, Inc., a Delaware corporation, and
           -----------
any successors thereto (including U.S.  Silica after the Merger).

          "Actual EBITDA" shall be calculated at the end of each Accounting
           --------------
Period of the Corporation, beginning with the Accounting Period ending December
31, 1997, and shall mean the EBITDA of the Corporation for the twelve-month
period ended on the last day of such Accounting Period.

          "Additional Institutional Director" shall have the meaning ascribed to
           ---------------------------------
it in Section 2(b).

          "Additional Retiring Purchase" has the meaning ascribed to it in
           ----------------------------
Section 14(a).

          "Adjusted Proportionate Percentage" shall mean, with respect to any
           ---------------------------------
Stockholder, the Proportionate Percentage of such Stockholder, calculated as if
the Retiring Shares were not issued and outstanding at the time of calculation.

          "Affiliate" means (i) with respect to any individual, (A) a spouse or
           ---------
descendant of such individual and (B) any trust or family partnership whose
primary beneficiary shall be such individual and/or such individual's spouse
and/or any Person related by blood or adoption to such individual or such
individual's spouse, (ii) with respect to any Person which is not an individual,
any other Person that, directly or indirectly through one or more intermediaries
Controls, is Controlled by, or is under common Control with, such Person and/or
one or more Affiliates thereof, and, without limiting the generality of the
                                ---
foregoing, with respect to CMC includes (x)
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the ultimate parent corporation of CMC, and all the Affiliates of the
aforementioned ultimate parent and (y) a corporation, a general partnership, a
limited partnership or limited liability corporation, in which all the
beneficial interests of any of the foregoing entities is owned directly or
indirectly by one or more present or former employees or executives of CMC or
their respective Affiliates.

          "Approved Sale" has the meaning ascribed to it in Section 13.
           -------------

          "Board" means the Board of Directors of the Corporation.
           -----

          "Bylaws" means the Bylaws of the Corporation as amended from time to
           ------
time.

          "Budgeted EBITDA" shall mean, for the twelve-month period ending on
           ---------------
the last day of each Accounting Period, beginning with the Accounting Period
ending December 31, 1998, the EBITDA set forth opposite such Accounting Period
on Schedule 2.

          "Cause" shall mean the commission by a Promoter Stockholder of a
           -----
felony or other crime involving moral turpitude, or the commission by a Promoter
Stockholder of any other act which is a breach of his fiduciary duty of loyalty
to his employer or the repeated failure of a Promoter Stockholder to otherwise
perform his duties to his employer as determined in good faith by such
employer's Board of Directors.

          "Certificate" means the Amended and Restated Certificate of
           -----------
Incorporation of the Corporation as filed with the Secretary of State of
Delaware on February 9, 1996, as supplemented by all Certificates of Designation
and Certificates of Amendment, copies of which are attached as Schedule 3.

          "Class A Common Stock" means the Class A Common Stock, $.01 par value,
           --------------------
of the Corporation.

          "Class B Common Stock" means the Class B Common Stock, $.01 par value,
           --------------------
of the Corporation.

          "Class C Common Stock" means the Class C Common Stock, $.0l par value,
           --------------------
of the Corporation.

          "Class C Restricted Shares" means, collectively, the DGHA Restricted
           -------------------------
Shares and the Manager Restricted Shares.

          "CMC" means Chase Manhattan Capital L.P., a Delaware limited
           ---
partnership.

          "Code" means the Internal Revenue Code of 1986, as amended.
           ----

          "Common Stock" means the Class A Common Stock, the Class B Common
           ------------
Stock and the Class C Common Stock.

          "Common Equivalents" means, at any point in time, (i) as to any
           ------------------
Stockholder, the number of shares of Common Stock held by such Stockholder at
such time, plus the number of

                                       2
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shares of Common Stock which are issuable (at such time or thereafter) upon the
exercise or conversion of any option, warrant or convertible security held at
such time by such Stockholder and (ii) as to all Stockholders, collectively, the
aggregate number of shares of Common Stock outstanding at such time plus the
aggregate number of shares of Common Stock issuable (at such time or thereafter)
upon the exercise or conversion of all outstanding options, warrants and
convertible securities.

          "Company" means, collectively, the Corporation and its Subsidiaries
           -------
and, individually, the Corporation and each Subsidiary of the Corporation.

          "Compensation Committee" shall mean the Compensation Committee of the
           ----------------------
Board, as constituted from time to time in accordance with Section 2(c).

          "Competitor" means any Person who directly or indirectly, owns,
           ----------
manages, operates, joins, controls or participates in the ownership, management,
operation or control of, or is connected as a director, officer, employee,
partner, consultant or otherwise with, any profit or non-profit business or
organization in any part of the United States or any other jurisdiction in which
the Company sells products or provides services, which, directly or indirectly,
Competes (as hereinafter defined) with the Company.  A profit or non-profit
business or organization shall be deemed to "Compete" with the Company if such
business or organization (i) competes with the business of the Company as it is
conducted as of the date hereof or at any time while this Agreement is in
effect, or (ii) engages in the development, production or sale of products, or
the rendering of services, which are the same as, similar to or competitive
with, the products or services being developed, provided, sold or rendered by
the Company as of the date hereof or at any time while this Agreement is in
effect.

          "Control" means the possession, directly or indirectly, of the power,
           -------
by stock ownership, contract right, proxy or otherwise, to direct the management
and policies of a Person.

          "Corporation" has the meaning ascribed to it in the Preamble.
           -----------

          "Credit Agreement" means the Credit Agreement dated as of July 21,
           ----------------
1998, as amended from time to time, among Acquisition and the lenders named
therein.

          "Credit Event" means (i) the existence of an event of default under
           ------------
any Debt Document, or (ii) the existence of a default, which is not waived or
cured within any applicable grace period provided for therein, under any other
document or agreement to which any Company is a party or an obligor, which
evidences indebtedness of any Company individually or in the aggregate of more
than $1,000,000.

          "Debt Documents" shall mean the Credit Agreement, the documents
           --------------
attached as exhibits thereto and any other loan agreement pursuant to which the
debt under such agreements is refinanced in whole or in part.

          "Deferral Date" has the meaning ascribed to it in Section 14(f).
           -------------

          "Deferral Election" has the meaning ascribed to it in Section 14(f).
           -----------------

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          "DGHA" shall mean D. George Harris & Associates, Inc.
           ----

          "DGHA Fee Letter" means the letter agreement dated the Original
           ---------------
Agreement Date among the Corporation, certain Subsidiaries thereof and DGHA, as
amended from time to time.

          "DGHA Repurchase Agreement" means the DGHA Repurchase Agreement dated
           -------------------------
the date hereof, among the Corporation and the DGHA Stockholders named therein.

          "DGHA Restricted Shares" means the 216,263 (as adjusted to reflect any
           ----------------------
stock splits, stock dividends, reverse stock splits or reclassifications of the
Class C Common Stock) shares of Class C Common Stock issued or issuable to the
DGHA Stockholders party to the DGHA Repurchase Agreement (and any Securities
issued in respect thereof), which shares are subject to repurchase by the
Corporation upon an IRR Event pursuant to the DGHA Repurchase Agreement, for so
long as such shares of Class C Common Stock are subject to the DGHA Repurchase
Agreement.

          "DGHA Stockholders" shall mean any Person listed on the Schedule of
           -----------------
DGHA Stockholders attached hereto as Schedule 4 and any other employee of DGHA
or an Affiliate of DGHA who is designated as such by the Chairman of DGHA.

          "EBITDA" has the meaning, for any period, ascribed to such term in the
           ------
Credit Agreement.

          "EBITDA Event" shall mean and occur if, at the end of any Accounting
           ------------
Period commencing with the twelve-month period ending December 31, 1997, the
Actual EBITDA for the twelve-month period ending on the last day of such
Accounting Period is less than 75% of the Budgeted EBITDA for the twelve-month
period ending on the last day of the corresponding Accounting Period.

          "Eligible Stockholders" has the meaning ascribed to it in Section
           ---------------------
14(a).

          "ERISA" means the Employee Retirement Income Security Act of 1974, as
           -----
amended from time to time, and the regulations promulgated and rulings issued
thereunder.

          "ERISA Affiliate" means any Person that for purposes of Title IV of
           ---------------
ERISA is a member of the controlled group of any Obligor, or under common
control with any Obligor, within the meaning of Section 414 of the Code.

          "ERISA Event" means (a) (i) the occurrence of a reportable event,
           -----------
within the meaning of Section 4043 of ERISA, with respect to any Plan unless the
30-day notice requirement with respect to such event (or the penalty for failure
to provide such notice) has been waived by the PBGC; or (ii) the requirements of
subsection (1) of Section 4043(b) of ERISA (without regard to subsection (2) of
such Section) are met with a contributing sponsor, as defined in Section
4001(a)(13) of ERISA, of a Plan, and an event described in paragraph (9), (10),
(11), (12) or (13) of Section 4043(c) of ERISA is reasonably expected to occur
with respect to such Plan within the following 30 days; (b) the application for
a minimum funding waiver with respect to a Plan; (c) the provision by the
administrator of any Plan of a notice of intent to

                                       4
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terminate such Plan, pursuant to Section 4041(a)(2) of ERISA (including any such
notice with respect to a plan amendment referred to in Section 4041(e) of
ERISA); (d) the cessation of operations at a facility of any Obligor or any
ERISA Affiliate in the circumstances described in Section 4062(e) of ERISA; (e)
the withdrawal by any Obligor or any ERISA Affiliate from a Multiple Employer
Plan during a plan year for which it was a substantial employer, as defined in
Section 4001(a)(2) of ERISA; (f) the conditions for imposition of a lien under
Section 302(f) of ERISA shall have been met with respect to any Plan; (g) the
adoption of an amendment to a Plan requiring the provision of security to such
Plan, pursuant to Section 307 of ERISA; or (h) the institution by the PBGC of
proceedings to terminate a Plan pursuant to Section 4042 of ERISA, or the
occurrence of any event or condition described in Section 4042 of ERISA that
could reasonably be expected to constitute grounds for the termination of, or
the appointment of a trustee to administer, such Plan.

          "Excess Attributable to the First Priority Additional Retiring
           -------------------------------------------------------------
Purchases" shall mean the lesser of (x) the number of Remaining Retiring Shares
---------
to be purchased in the aggregate by the First Priority Eligible Stockholders
pursuant to their Additional Retiring Purchases and (y) the excess Remaining
Retiring Shares remaining after the Second Retirement Reduction.

          "Excess Attributable to the Second Priority Additional Retiring
           --------------------------------------------------------------
Purchases" shall mean the lesser of (x) the number of Remaining Retiring Shares
---------
to be purchased in the aggregate by the Second Priority Eligible Stockholders
pursuant to their Additional Retiring Purchases and (y) the excess Remaining
Retiring Shares remaining prior to the First Retirement Reduction.

          "Exchange Act" means the Securities Exchange Act of 1934, as amended,
           ------------
or any similar federal law then in force.

          "Exclusive Period" has the meaning ascribed to it in Section 15.
           ----------------

          "Exempt Issuance" shall mean (i) the issuance of shares of Class A
           ---------------
Common Stock or Class B Common Stock upon the conversion of shares of Series B
Preferred Stock and the issuance of shares of Class A Common Stock upon the
conversion of shares of Class B Common Stock, (ii) the issuance of Securities to
a DGHA Stockholder pursuant to Section 3 of the DGHA Repurchase Agreement and
Section 7(b), (iii) the issuance of Securities to a Manager Stockholder pursuant
to Section 3 of the Manager Repurchase Agreement and Section 7(a), (iv) the
issuance of the Warrants pursuant to the Warrant Issuance Agreement and the
issuance of Securities pursuant to the exercise of the Warrants, (v) the
issuance of Securities, or any securities convertible into or exercisable for
Securities, pursuant to a Public Offering and (vi) the issuance of Securities to
a DGHA Stockholder or a Manager Stockholder after repurchase by the Corporation
pursuant to the DGHA Repurchase Agreement, the Manager Repurchase Agreement or
pursuant to Section 14, of an equivalent or greater number of Securities from
one or more DGHA Stockholders, Manager Stockholders or Non-Affiliated
Stockholders.

          "Fair Value" has the meaning ascribed to it in Section 15(a).
           ----------

          "First Priority Eligible Stockholders" shall mean (i) with respect to
           ------------------------------------
any Transfer to be made by a DGHA Stockholder, the other DGHA Stockholders, (ii)
with respect to any Transfer to be made by a Manager Stockholder, the other
Manager Stockholders and (iii) with

                                       5
<PAGE>

respect to any Transfer to be made by a Non-Affiliated Stockholder, the other
Non-Affiliated Stockholders.

          "First Refusal Amount" has the meaning ascribed to it in Section 5(a).
           --------------------

          "First Refusal Securities" has the meaning ascribed to it in Section
           ------------------------
5(a).

          "GAAP" means United States generally accepted accounting principles,
           ----
consistently applied.

          "Individual Investor Put Shares" has the meaning ascribed to it in
           ------------------------------
Section 14(c).

          "Initial Institutional Director" shall have the meaning ascribed to it
           ------------------------------
in Section 2(a)(iii).

          "Initial Public Offering" means the initial Public Offering of equity
           -----------------------
securities of the Corporation.

          "Initial Retiring Purchase" has the meaning ascribed to it in Section
           -------------------------
14(a).

          "Institutional Directors" has the meaning ascribed to it in Section
           -----------------------
2(b).

          "Institutional Securities" means all Securities owned by the
           ------------------------
Institutional Stockholders.

          "Institutional Stockholders" means any Person listed on the Schedule
           --------------------------
of Institutional Stockholders attached hereto as Schedule 6 and any successor
to, or Permitted Transferee (excluding any transferee who purchases
Institutional Securities pursuant to Section 6) of, any such Person who or which
agrees in writing to be treated as an Institutional Stockholder hereunder and to
be bound by the terms and comply with all applicable provisions hereof.

          "IRR Event" means the occurrence of any of the following:
           --------

                (i)    the sale of all or substantially all of the assets of the
          Corporation and its Subsidiaries (in each case after assumption of all
          the liabilities of the Corporation or the Subsidiary), on a
          consolidated basis;

                (ii)   the sale of all or substantially all of the Securities;

                (iii)  a merger of the Corporation or any Subsidiary, provided
          that the merger comprises all or substantially all of the assets of
          the Corporation and its Subsidiaries, with another Person if the
          stockholders of the Corporation immediately prior to such merger do
          not own more than 80% of the corporation surviving such merger;

                (iv)   the consummation of a Qualified Public Offering; or

                (v)    a sale made pursuant to Section 15.

                                       6
<PAGE>

          "Majority of the Institutional Stockholders" means those Institutional
           ------------------------------------------
Stockholders who at the time in question hold a majority of the Common
Equivalents then held by all Institutional Stockholders.

          "Majority of the DGHA Stockholders" means those DGHA Stockholders who
           ---------------------------------
at the time in question hold a majority of the Common Equivalents then held by
all DGHA Stockholders.

          "Management Services Agreement" means the Amended and Restated
           -----------------------------
Management Services Agreement dated as of the date hereof among the Corporation,
certain subsidiaries thereof and DGHA, as amended or modified from time to time.

          "Manager Repurchase Agreement" means the Manager Repurchase
           ----------------------------
Agreements, a form of which is attached hereto as Schedule 7, to be entered into
between the Corporation and each Manager Stockholder who purchases Manager
Restricted Shares, respectively.

          "Manager Restricted Shares" means the 216,263 (as adjusted to reflect
           -------------------------
any stock splits, stock dividends, reverse stock splits or reclassifications of
the Class C Common Stock) shares of Class C Common Stock issued or issuable to
the Manager Stockholders party to the Manager Repurchase Agreement (and any
Securities issued in respect thereof), which shares are subject to repurchase by
the Corporation upon an IRR Event pursuant to the Manager Repurchase Agreement,
for so long as such shares of Class C Common Stock are subject to the Manager
Repurchase Agreement.

          "Manager Stockholder" shall mean any Person listed on the Schedule of
           -------------------
Manager Stockholders attached hereto as Schedule 8 and any Stockholder who
purchases Securities who is a full-time employee of the Corporation or of any
Subsidiary and is designated as such by the Board, but specifically excluding
the DGHA Stockholders.

          "Merger" means the consummation of the merger between Acquisition and
           ------
U.S. Silica, with U.S. Silica as the surviving corporation.

          "Multiple Employer Plan" means a single employer plan, as defined in
           ----------------------
Section 4001(a)(15) of ERISA, that (a) is maintained for employees of any
Obligor or any ERISA Affiliate and at least one Person other than the Obligors
and the ERISA Affiliates or (b) was so maintained and in respect of which any
Obligor or any ERISA Affiliate could have liability under Section 4064 or 4069
of ERISA in the event such plan has been or were to be terminated.

          "Non-Affiliated Stockholder" shall mean any Person listed on the
           --------------------------
Schedule of Non-Affiliated Stockholders attached hereto as Schedule 5.

          "Notice Date" has the meaning ascribed to it in Section 14(b).
           -----------

          "Notice of Offer" has the meaning ascribed to it in Section 11(a).
           ---------------

          "Obligor" means Acquisition and U.S. Silica.
           -------

          "Offer" has the meaning ascribed to it in Section 11(a).
           -----

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<PAGE>

          "Offeree" has the meaning ascribed to it in Section 11(a).
           -------

          "Offeror" shall have the meaning ascribed to it in Section 11(a).
           -------

          "Officer's Report" has the meaning ascribed to it in Section 3(a)(ii).
           ----------------

          "Original Agreement Date" means February 9, 1996.
           -----------------------

          "Other Stockholders" has the meaning ascribed to it in Section 12(a).
           ------------------

          "PBGC" means the Pension Benefit Guaranty Corporation.
           ----

          "Permitted Transferees" has the meaning ascribed to such term in
           ---------------------
Section 8(d).

          "Person" shall be construed broadly and shall include an individual, a
           ------
partnership, a corporation, an association, a joint stock company, a limited
liability company, a trust, a joint venture, an unincorporated organization and
a governmental entity or any department, agency or political subdivision
thereof.

          "Plan" means a Single Employer Plan or a Multiple Employer Plan.
           ----

          "Preferred Stock" means (i) the Series A Preferred Stock, the Series B
           ---------------
Preferred Stock and the Seller Preferred Stock and (ii) any shares of any series
of Preferred Stock of the Corporation issued to the Stockholders on or after the
Original Agreement Date.

          "Primary Retirement Notice" has the meaning ascribed to it in Section
           -------------------------
14(a).

          "Proportionate Percentage" means, with respect to a Stockholder, a
           ------------------------
fraction (expressed as a percentage) the numerator of which is the number of
Common Equivalents held by such Stockholder and the denominator of which is (i)
in a situation where the Proportionate Percentage is being calculated with
respect to all Stockholders, the total number of Common Equivalents outstanding
at the time in question and (ii) in a situation where the Proportionate
Percentage is being calculated with respect to a group of Stockholders, the
total number of Common Equivalents held by the members of such group.

          "Public Offering" means the closing of a public offering of Common
           ---------------
Stock pursuant to a registration statement declared effective under the
Securities Act, except that a Public Offering shall not include an offering made
in connection with an employee benefit plan.

          "Public Sale" means any sale, occurring simultaneously with or after a
           -----------
Public Offering, of Securities to the public pursuant to an offering registered
under the Securities Act or to the public through a broker, dealer or market
maker pursuant to the provisions of Rule 144.

          "Qualified Public Offering" means the sale by the Corporation and/or
           -------------------------
one or more stockholders of the Corporation in an underwritten Public Offering
registered under the Securities Act of Common Stock which results in aggregate
net cash proceeds (net of underwriters' discounts and commissions and estimated
offering expenses) to the Corporation and/or any selling stockholders of not
less than $30 million.

                                       8
<PAGE>

          "Registration Rights Agreement" means the Registration Rights
           -----------------------------
Agreement dated as of February 9, 1996, as amended by Amendment No. 1 dated as
of the date hereof and as may be amended or modified from time to time in the
future, among the Corporation and the parties named therein.

          "Regulatory Problem" means (i) any set of facts or circumstances
           ------------------
wherein it has been asserted by any governmental regulatory agency, or a
Stockholder believes based on advice of counsel that there is a substantial risk
of such assertion, that such Stockholder is not legally permitted to hold, or
exercise any significant right with respect to, the securities (including any
Securities or debt securities) of the Corporation which it holds or (ii) a
Voting Regulatory Problem.

          "Remaining Retiring Shares" has the meaning ascribed to it in Section
           -------------------------
14(a).

          "Requisite Stockholders" means a Majority of the Institutional
           ----------------------
Stockholders and a Majority of the DGHA Stockholders; provided, however, that if
the Majority of the Institutional Stockholders have designated the Additional
Institutional Directors pursuant to Section 2(b) hereof, "Requisite
                                                          ---------
Stockholders" means, solely for purposes of Section 4(a) (other than subsection
------------
4(a)(vii) and subsection 4(a)(xi) only with respect to any transactions between
the Corporation or any of its Subsidiaries and any Institutional Stockholder),
Section 4(b) and Section 13, a Majority of the Institutional Stockholders.

          "Requisite Stockholder Approval" means the approval of the terms,
           ------------------------------
vesting or any other characteristics of any restricted stock of the Corporation,
or any compensation arrangement relating to the Corporation, by vote or written
consent in lieu thereof, that is intended to satisfy the requirements of Code
Section 280G(b)(5) and applicable Treasury Regulations thereunder, and shall
also include any vote (with or without a meeting) or any other action or
actions.

          "Restricted Securities" means, at any point in time, any Securities
           ---------------------
which have not theretofore been transferred in a Public Sale.

          "Retiring Participation Shares" has the meaning ascribed to it in
           -----------------------------
Section 14(a).

          "Retiring Shares" has the meaning ascribed to it in Section 14(a).
           ---------------

          "Retiring Stockholder" has the meaning ascribed to it in Section
           --------------------
14(a).

          "Rule 144" means Rule 144 promulgated by the Securities and Exchange
           --------
Commission under the Securities Act as such rule may be amended from time to
time, or any similar rule then in force.

          "Sale of the Company" has the meaning ascribed to it in Section 13(a).
           -------------------

          "Sale Notice" has the meaning ascribed to it in Section 13(a).
           -----------

          "Second Retirement Notice" has the meaning ascribed to it in Section
           ------------------------
14(a).

                                       9
<PAGE>

          "Second Priority Eligible Stockholders" shall mean (i) with respect to
           -------------------------------------
any Transfer to be made by a DGHA Stockholder, the Stockholders other than the
DGHA Stockholders, (ii) with respect to any Transfer to be made by a Manager
Stockholder, the Stockholders other than the Manager Stockholders, and (iii)
with respect to any Transfer to be made by a Non-Affiliated Stockholder, the
Stockholders other than the Non-Affiliated Stockholders.

          "Second Retirement Notice" has the meaning ascribed to it in Section
           ------------------------
14(b).

          "Section 12 Acceptance" shall have the meaning ascribed to it in
           ---------------------
Section 12(a).

          "Section 12 Notice" shall have the meaning ascribed to it in Section
           -----------------
12(a).

          "Section 12 Offer" shall have the meaning ascribed to it in Section
           ----------------
12(a).

          "Section 12 Offeree" shall have the meaning ascribed to it in Section
           ------------------
12(a).

          "Section 12 Offeror" shall have the meaning ascribed to it in Section
           ------------------
12(a).

          "Securities" means the Common Stock, the Preferred Stock, and any and
           ----------
all other Common Stock, Preferred Stock or other capital stock or equity
securities (including the Warrants and other derivative securities therefor) of
the Corporation.

          "Securities Act" means the Securities Act of 1933, as amended, or any
           --------------
similar federal law then in force.

          "Securities and Exchange Commission" includes any governmental body or
           ----------------------------------
agency succeeding to the functions thereof

          "Seller Preferred Stock" means the Series C Preferred Stock, $0.01 par
           ----------------------
value, of the Corporation issued to U.S. Borax Inc. upon the closing of the
Stock Purchase Agreement.

          "Series A Preferred Stock" means the Series A Preferred Stock, $0.01
           ------------------------
par value, of the Corporation.

          "Series B Preferred Stock" means the Series B Preferred Stock, $0.01
           ------------------------
par value, of the Corporation.

          "Single Employer Plan" means a single employer plan, as defined in
           --------------------
Section 4001(a)(15) of ERISA, that (a) is maintained for employees of any
Obligor or any ERISA Affiliate and no Person other than the Obligors and the
ERISA Affiliates or (b) was so maintained and in respect of which any Obligor or
any ERISA Affiliate could have liability under Section 4069 of ERISA in the
event such plan has been or were to be terminated.

          "Stock Purchase Agreement" means the Stock Purchase Agreement between
           ------------------------
U.S. Borax Inc. and the Corporation dated October 23, 1995, as amended or
modified from time to time.

                                       10
<PAGE>

          "Subscription Agreement" shall mean the Stock Subscription and
           ----------------------
Exchange Agreement dated the Original Agreement Date, among the Corporation and
the Stockholders which are parties thereto.

          "Subsidiary" means with respect to any Person, any corporation or
           ----------
other entity of which the shares of stock having a majority of the general
voting power in electing the board of directors of such corporation or other
entity are, at the time as of which any determination is being made, owned by
such Person either directly or indirectly through Subsidiaries.

          "Tax Sharing Agreement" means the Amended and Restated Tax Sharing
           ---------------------
Agreement dated as of July 21, 1998 between the Corporation and the parties
named therein.

          "Termination Event" has the meaning ascribed to it in Section 14(d).
           -----------------

          "Transfer" shall be construed broadly and shall include any transfer
           --------
(whether voluntary, involuntary or by operation of law) of securities or any
interest therein, including without limitation, by way of issuance, sale,
participation, pledge, gift, bequeath, intestate transfer, distribution,
liquidation, merger or consolidation.

          "Transfer Date" has the meaning ascribed to it in Section 14(e).
           -------------

          "Trigger Event" shall mean (a) the existence of a Credit Event or the
           -------------
occurrence of an EBITDA Event, (b) the termination of the Exclusive Period or
(c) both of Mr. D. George Harris and Mr.  Anthony J. Petrocelli shall have
ceased to serve on the Board due to death, disability or resignation.

          "U.S. Silica" means U.S. Silica Company, a Delaware corporation.
           -----------

          "Valuation Price per Share" means, with respect to any Security, the
           -------------------------
amount distributable to such Security, if the Company is sold at Fair Value and
the proceeds are distributed by the Corporation in complete liquidation pursuant
to the rights and preferences set forth in the Certificate immediately prior to
the Notice Date.

          "Voting Regulatory Problem" shall exist when a Person and such
           -------------------------
Person's Affiliates would own, control or have power over a greater quantity of
securities (including any Securities or debt securities) of any kind issued by
the Corporation or any successor than are permitted under any requirement of any
governmental authority having jurisdiction over such Person.

          "Voting Securities" means the Class A Common Stock, the Series B
           -----------------
Preferred Stock (from and after a Trigger Event in accordance with the terms of
the Certificate) and any other Securities of the Corporation which shall at the
time in question be entitled to vote on each matter as to which stockholders of
the Corporation are entitled to vote.

          "Warrants" means the warrants to purchase shares of Series A Preferred
           --------
Stock and Series B Preferred Stock granted from time to time pursuant to the
Warrant Issuance Agreement.

                                       11
<PAGE>

          "Warrant Issuance Agreement" means a Warrant Issuance Agreement or
           --------------------------
similar document to be entered into by the Corporation and the Persons who
shall, from time to time, purchase Warrants.

          "Withdrawal Liability" has the meaning assigned to such term in Part I
           --------------------
of Subtitle E of Title IV of ERISA.

          (b)    The use in this Agreement of the term "including" means
     "including, without limitation." The words "herein," "hereof," "hereunder"
     and other words of similar import refer to this Agreement as a whole,
     including the schedules and exhibits, as the same may from time to time be
     amended or supplemented, and not to any particular subparagraph or clause
     contained in this Agreement.  All references to schedules and exhibits mean
     the schedules and exhibits attached to this Agreement.

          (c)    Unless otherwise expressly set forth herein, whenever the term
     "best efforts" is used, such efforts shall not include any obligation to
     incur substantial expenses or liabilities.

          (d)    The title of and the section and paragraph headings in this
     Agreement are for convenience of reference only and shall not govern the
     interpretation of any of the terms or provisions of this Agreement.

          (e)    The use herein of the masculine, feminine or neuter forms shall
     also denote the other forms, as in each case the context may require.

          (f)    Where specific language is used to clarify by example a general
     statement contained herein, such specific language shall not be deemed to
     modify, limit or restrict in any manner the construction of the general
     statement to which it relates.  The language used in this Agreement has
     been chosen by the parties to express their mutual intent, and no rule of
     strict construction shall be applied against any party.

     SECTION 2.  Board of Directors; Adjustment EBITDA Targets.
                 ---------------------------------------------

          (a)    Election of Directors Generally.  Each Stockholder shall from
                 -------------------------------
     time to time take such action, in his capacity as a stockholder of the
     Corporation, including the voting of all Securities owned or controlled by
     such Stockholder, as may be necessary to cause the Corporation to be
     managed at all times by a Board, consisting of seven members to be
     designated as follows:

                 (i)   for so long as D. George Harris and his Affiliates own
          50% or more of the Securities (other than DGHA Restricted Shares) held
          by them on the Original Agreement Date, two directors shall be
          designated by D. George Harris, one of which designated directors
          shall be D. George Harris (each a "George Harris Director" and
          together the "George Harris Directors");

                 (ii)   for so long as Anthony J. Petrocelli and his Affiliates
          own 50% or more of the Securities (other than the DGHA Restricted
          Shares) held by them on

                                       12
<PAGE>

          the Original Agreement Date, one director shall be designated by
          Anthony J. Petrocelli (the "Petrocelli Director");

                 (iii) three directors shall be designated by a Majority of the
          Institutional Stockholders (each an "Initial Institutional Director"
          and together the "Initial Institutional Directors");

                 (iv)  one director shall be the President of the Corporation;

                 (v)   for so long as D. George Harris shall be elected as a
          director he shall also be elected as the Chairman of the Board and
          Chief Executive Officer of the Corporation, and for so long as Anthony
          J. Petrocelli shall be elected as a director he shall also be elected
          as the Vice-Chairman of the Board;

          Notwithstanding the forgoing, in the event of a Termination Event with
respect to D. George Harris or Anthony J. Petrocelli, the DGHA Stockholder with
respect to which such Termination Event has occurred shall not be entitled to
designate any directors and the Harris Directors or the Petrocelli Director, as
applicable, shall thereafter be designated by the Majority of the DGHA
Stockholders.

          (b)    Election of Additional Institutional Directors. In addition to
                 ----------------------------------------------
     the directors designated pursuant to Section 2(a), upon the occurrence of a
     Trigger Event, the Majority of the Institutional Stockholders shall have
     the right to designate two additional directors (each an "Additional
     Institutional Director" and together the "Additional Institutional
     Directors") so as to cause the directors designated by the Institutional
     Stockholders to constitute a majority of the directors on the Board;
     provided, however, that such right shall be exercisable by the Majority of
     --------  -------
     the Institutional Stockholders only upon the delivery to the Corporation,
     during the continuance of the Trigger Event, of a written notice by a
     representative of the Majority of the Institutional Stockholders of their
     desire to designate the Additional Institutional Directors. The Initial
     Institutional Directors and the Additional Institutional Directors are
     referred to herein collectively as the "Institutional Directors" and each,
     individually, an "Institutional Director". Each Stockholder shall, at such
     times as the Majority of the Institutional Stockholders are entitled to
     designate the Additional Institutional Directors and upon written notice
     from the Corporation or take such action, in his capacity as a stockholder
     of the Corporation, including the voting of all Securities owned or
     controlled by such Stockholder, as may be necessary to cause the Additional
     Institutional Directors to be elected to the Board.

          (c)  Compensation Committee.  Each Stockholder shall from time to
               ----------------------
     time take such action, in his capacity as a stockholder of the Corporation,
     including the voting of all Securities owned or controlled by such
     Stockholder, as may be necessary to cause a Compensation Committee of the
     Board to be constituted and to consist of three directors, two of which
     shall be Institutional Directors and one of which shall be a D. George
     Harris Director.

                                       13
<PAGE>

          (d)  Expenses.  The Corporation shall pay the reasonable out-of-
               --------
     pocket expenses incurred by each Board member designated pursuant to
     Section 2(a) or 2(b) in connection with attending the meetings of the Board
     and any committees thereof.

          (e)  Covenant to Vote.  Each of the Stockholders agrees to vote, in
               ----------------
     person or by proxy, all of the Securities owned by such Stockholder and
     entitled to vote at any annual or special meeting of the stockholders of
     the Corporation called for the purpose of voting on the election of
     directors, or to execute a written consent in lieu thereof, in favor of the
     election of the directors selected in accordance with Section 2(a) or 2(b).

          (f)  Removal of Directors.
               --------------------

               (i)   At all times (A) a Majority of the Institutional
          Stockholders shall have the right to recommend the removal, without
          cause, of any or all of the Institutional Directors, (B) D. George
          Harris (or, if the George Harris Directors are at such time designated
          by the Majority of the DGHA Stockholders, the Majority of the DGHA
          Stockholders) shall have the right to recommend the removal, without
          cause, of any or all of the George Harris Directors, and (C) Anthony
          J. Petrocelli (or, if the Petrocelli Director is at such time
          designated by the Majority of the DGHA Stockholders the Majority of
          the DGHA Stockholders) shall have the right to recommend the removal,
          without cause, of the Petrocelli Director.

               (ii)  In the event that any Stockholder acting as described in
          Section 2(f)(i) shall, in accordance with their rights specified
          herein, recommend the removal of any director or directors with
          respect to whom they have such right, then each of the other
          Stockholders hereby agrees to join with such acting Stockholder in
          recommending such removal as described above, and in causing the
          Corporation either to promptly hold a special meeting of stockholders
          and to vote, in person or by proxy, all of the Securities owned by
          such Stockholder and entitled to vote at such meeting or to execute a
          written consent in lieu thereof, as the case may be, in favor of such
          removal.

          (g)  Vacancies. In the event a vacancy is created on the Board by
               ---------
     reason of the death, removal or resignation of any director, (i) such
     vacancy may be filled by the remaining directors in accordance with
     Sections 2(a) or 2(b), as applicable, (ii) if not so filled, each of the
     Stockholders hereby agrees, in its capacity as a stockholder of the
     Corporation, to elect a director to fill such vacancy in accordance with
     the selection procedures set forth in Sections 2(a) and 2(b) as applicable.
     Such election shall occur within thirty days after such vacancy occurs.
     Each of the Stockholders hereby agrees, in his capacity as a stockholder of
     the Corporation, to use his best efforts to cause the Corporation either to
     promptly hold a special meeting of stockholders or to execute a written
     consent in lieu thereof, and each of the Stockholders hereby agrees to vote
     all of the Securities owned by such Stockholder and entitled to vote at
     such meeting, in person or by proxy, or pursuant to such written consent of
     stockholders, in favor of the person or persons selected in accordance with
     Sections 2(a) or 2(b) to fill such vacancy and, if

                                       14
<PAGE>

     necessary, in favor of removing any director elected to fill such vacancy
     other than in accordance with the selection procedures of Sections 2(a) or
     2(b).

          (h)  No Inconsistent Agreements.  Each Stockholder represents that he
               --------------------------
     has not granted and is not a party to any proxy, voting trust or other
     agreement which is inconsistent with or conflicts with the provisions of
     this Agreement, and no Stockholder shall grant any proxy or become party to
     any voting trust or other agreement which is inconsistent with or conflicts
     with the provisions of this Agreement.

          (i)  Budgeted EBITDA.  In the event the Corporation or any Subsidiary
               ---------------
     makes any material capital expenditures not contemplated by the projections
     upon which the Budgeted EBITDA targets are based, or the Corporation or any
     Subsidiary consummates any mergers, acquisitions or dispositions (whether
     of assets or stock or other interests) or other extraordinary transactions,
     the Board will determine in good faith appropriate adjustments to the
     Budgeted EBITDA targets, which adjustments shall be final and binding.

          (j)  Appointment of President.  Upon the removal or resignation of
               ------------------------
     the President of the Corporation, his successor shall be appointed by the
     vote of a majority of the directors on the Board and the outgoing President
     shall abstain from such vote.

     SECTION 3.  Financial Statements and Other Information, Inspections and
                 -----------------------------------------------------------
Board Meetings.
--------------

          (a)  Prior to the consummation of an Initial Public Offering, the
     Corporation will deliver to each Stockholder having a Proportionate
     Percentage of at least 5%:

               (i)   as soon as available but in any event within 30 days after
          the end of each calendar month (the "Accounting Periods") in each
          fiscal year, unaudited consolidated statements of income and cash
          flows of the Corporation and its Subsidiaries for such Accounting
          Period and for the period from the beginning of the fiscal year to the
          end of such Accounting Period, which statements shall also include the
          EBITDA of the Corporation and its Subsidiaries for such Accounting
          Period, and consolidated balance sheets of the Corporation and its
          Subsidiaries as of the end of such Accounting Period, setting forth in
          each case comparisons to the corresponding period in the annual budget
          and to the corresponding period in the preceding fiscal year with
          variances delineated, and all such statements will be prepared in
          accordance with generally accepted accounting principles, consistently
          applied;

               (ii)  as soon as available but in any event within 45 days after
          the end of each fiscal quarter of the Corporation unaudited
          consolidated statements of income and cash flows of the Corporation
          and its Subsidiaries for such fiscal quarter, setting forth in each
          case comparisons to the corresponding period in the annual budget and
          to the corresponding period in the preceding fiscal year with
          variances delineated, and accompanied by a written report of the
          Corporation's Chief Executive Officer, Chief Operating Officer or
          Chief Financial Officer with

                                       15
<PAGE>

          respect to (a) such Officer's lack of actual knowledge after due
          investigation of any condition or event which constitutes an event of
          default under the terms of this Agreement, a Credit Event or an EBITDA
          Event; (b) the operations, problems and achievements of the
          Corporation during such period and (c) the calculation of the
          financial tests required under the Credit Agreement for such period
          (such written report being referred to herein as the "Officer's
          Report");

               (iii) as soon as available but in any event within 90 days
          after the end of each fiscal year of the Corporation, audited
          consolidated statements of income and cash flows of the Corporation
          and its Subsidiaries for such year, and the related balance sheets of
          the Corporation and its Subsidiaries as of the end of such year,
          setting forth in each case in comparative form the corresponding
          figures for the preceding fiscal year and for the annual budget for
          such year, and accompanied by (a) an opinion thereon of independent
          certified public accountants reasonably acceptable to a majority in
          interest of all Stockholders (it being agreed that Price Waterhouse
          Coopers is acceptable), which opinion shall state that said financial
          statements (other than the annual budget) fairly present the financial
          condition and results of operations of the Corporation and its
          Subsidiaries as at the end of, and for, such fiscal year, (b) a letter
          from such accounting firm stating that in the course of its
          examination they obtained no knowledge, except as specifically stated,
          that there was a default in existence by the Corporation or any
          Subsidiary under this Agreement or any other material agreement to
          which the Corporation or any Subsidiary is a party and (c) an
          Officer's Report;

               (iv)  promptly upon receipt thereof, any additional reports,
          management letters (including the annual management letter to the
          Board) or other detailed information concerning significant aspects of
          the Corporation's and its Subsidiaries' operations and financial
          affairs given to the Corporation by its independent accountants (and
          not otherwise contained in other materials provided hereunder);

               (v)   no later than 30 days prior to the end of each fiscal year,
          a consolidated annual budget prepared on a monthly basis for the
          Corporation and its Subsidiaries for the succeeding fiscal year
          (displaying anticipated statements of income and cash flows and
          balance sheets);

               (vi)  promptly (but in any event within ten (10) business days)
          after the discovery or receipt of notice of (a) any default under the
          terms of any material agreement to which the Corporation or any
          Subsidiary is a party (including without limitation, this Agreement)
          or, without limitation to the generality of the foregoing, a Trigger
          Event or any other adverse event or circumstance affecting the
          Corporation or any Subsidiary which is material to the Corporation and
          its Subsidiaries taken as a whole (including the filing of any
          material litigation against the Corporation or any Subsidiary or the
          existence of a dispute that may reasonably be expected to lead to
          material litigation) or (b) any noncompliance by the Corporation or
          any Subsidiary with applicable laws, rules and regulations of

                                       16
<PAGE>

          all governmental authorities, the violation of which might reasonably
          be expected to have a material adverse effect upon the financial
          condition of the Corporation and its Subsidiaries taken as a whole, an
          Officer's Certificate specifying the nature and a period of existence
          thereof and what actions the Corporation and its Subsidiaries have
          taken and propose to take with respect thereto;

               (vii)   within ten (10) days after transmission thereof, copies
          of all registration statements which the Corporation files with the
          Securities and Exchange Commission, and copies of all press releases
          and other statements made available generally by the Corporation to
          the public concerning material developments in the Corporation's
          business;

               (viii)  immediately upon receipt thereof, copies of all
          environmental reports or other communications concerning environmental
          matters of the Corporation or its Subsidiaries which might reasonably
          be expected to have a material adverse effect upon the financial
          condition of the Corporation and its Subsidiaries taken as a whole;
          and

               (ix)    with reasonable promptness, such other information and
          financial data concerning the Corporation and its Subsidiaries as any
          Stockholder having a Proportionate Percentage of at least 5% may
          reasonably request.

          To the best of the Corporation's knowledge, each of the financial
statements referred to in subparagraphs (i), (ii) and (iii) will be true and
correct in all material respects as of the dates and for the periods stated
therein, subject in the case of the unaudited financial statements to footnotes
and changes resulting from normal year-end audit adjustments.

          The Corporation will provide to all Stockholders, when available,
audited consolidated statements of income and cash flows of the Corporation and
its Subsidiaries and the related consolidated balance sheet of the Corporation
and its Subsidiaries, accompanied by an opinion thereon of the Corporation's
independent certified public accountant.

          (b)  Except as consented to in writing by the Corporation or as
     otherwise required by law or judicial order or decree or by any
     governmental agency or authority, each Person which obtains information
     regarding the Corporation and its Subsidiaries under this Section 3 will
     use its best efforts to maintain the confidentiality of all nonpublic
     information obtained by it hereunder which the Corporation has reasonably
     designated as proprietary or confidential in nature; provided that each
     such Person may disclose such information to a Permitted Transferee in
     connection with the sale or transfer of any Securities if such Permitted
     Transferee agrees in writing to be bound by the provisions hereof.

          (c)  Prior to the consummation of an Initial Public Offering, the
     Corporation will permit each representative designated by any Stockholder
     having a Proportionate Percentage of at least 5%, upon reasonable notice to
     the Chief Executive Officer of the Corporation, during normal business
     hours or such other times as any such holder may reasonably request and in
     such manner so as not to unreasonably interfere with the

                                       17
<PAGE>

     business and operations of the Corporation or any Subsidiary, to, at such
     holder's expense, (i) visit and inspect any of the properties of the
     Corporation and its Subsidiaries, (ii) examine the corporate and financial
     records of the Corporation and its Subsidiaries and make copies thereof or
     extracts therefrom and (iii) discuss the affairs, finances and accounts of
     any such corporations with the directors, officers, key employees and
     independent accountants of the Corporation and its Subsidiaries.

     SECTION 4.  Additional Voting Agreements; Required Sale.
                 -------------------------------------------

          (a)  The Corporation shall not, and shall ensure that each Subsidiary
     shall not, without the affirmative vote or written consent of the Requisite
     Stockholders:

               (i)     consummate a Public Offering;

               (ii)    except as contemplated by this Agreement, the
          Subscription Agreement or the Warrant Issuance Agreement, after it
          shall have been executed, issue any Securities other than to the
          Corporation or to a wholly-owned Subsidiary;

               (iii)   merge or consolidate with or into another entity (other
          than mergers of wholly-owned Subsidiaries and mergers of a wholly-
          owned Subsidiary with and into the Corporation where the Corporation
          is the surviving corporation);

               (iv)    acquire any business from, or capital stock of, any
          Person;

               (v)     redeem the Seller Preferred Stock, otherwise than as
          required pursuant to the Certificate;

               (vi)    amend its Certificate of Incorporation;

               (vii)   amend its Bylaws;

               (viii)  increase the compensation of any of its officers,
          directors or management employees, above the levels in existence as of
          the date hereof, or pay any fees to directors unless approved by the
          Compensation Committee;

               (ix)    sell, lease, exchange, convey, license or otherwise
          dispose of in any 12-month period in excess of 10% (or, in the
          aggregate during the term of this Agreement, in excess of 25%) of its
          consolidated assets or assets which contributed 10% (or, in the
          aggregate during the term of this Agreement, in excess of 25%), or
          more of its average annual EBITDA over the last 12 fiscal months, in
          any transaction or series of related transactions (other than sales in
          the ordinary course of business);

               (x)     liquidate, dissolve or effect a recapitalization or
          reorganization in any form of transaction;

                                       18
<PAGE>

               (xi)    enter into, revise or amend any contract, agreement or
          transaction with any of its officers, directors, management employees
          or Affiliates, except for (a) the entering into of the Management
          Services Agreement, the DGHA Fee Letter, the Warrant Issuance
          Agreement, the Registration Rights Agreement, the Tax Sharing
          Agreement, the DGHA Repurchase Agreement and the Manager Repurchase
          Agreement and the amendment of the Management Services Agreement
          contemplated by Section 5(d) thereof and (b) employment related
          transactions on customary terms, bonus plans approved by the
          Compensation Committee and for normal employment arrangements and
          benefit programs on reasonable terms and except as otherwise
          contemplated by this Agreement;

               (xii)   incur or create, any indebtedness for borrowed money in
          excess of the amounts permitted by the Debt Documents;

               (xiii)  make any loans or advances to, guarantees for the benefit
          of, or investments in, any Person (other than a wholly-owned
          Subsidiary), except as permitted by the Debt Documents or the
          Management Services Agreement and except for (a) reasonable advances
          to employees in the ordinary course of business, (b) investments
          having a stated maturity no greater than one year from the date the
          Corporation makes such investment in (1) obligations of the United
          States government or any agency thereof or obligations guaranteed by
          the United States government, (2) certificates of deposit of
          commercial banks having combined capital and surplus of at least $50
          million or (3) commercial paper with a rating of at least "Prime-1" by
          Moody's Investors Service, Inc. or "A- 1" by Standard & Poor's
          Corporation and (c) repurchase obligations with a term of not more
          than seven days for underlying securities of the types described in
          clause (b)(1) of this subparagraph (xiii) entered into with any bank
          meeting the qualifications specified in clause (b)(2) of this
          subparagraph (xiii);

               (xiv)   declare or pay any dividends upon the Securities (other
          than the Series A Preferred Stock and the Seller Preferred Stock); or

               (xv)    take any action that would cause the Corporation or any
          Subsidiary to incur a material liability to any Plan or the PBGC or
          substantially increase the rate of annual contributions to any Plan.

          (b)  At all times during the term of this Agreement the Corporation
     will, and will cause each Subsidiary to unless consent is obtained from the
     Requisite Stockholders:

               (i)     cause to be done all things necessary to maintain,
          preserve and renew its corporate existence and all material licenses,
          authorizations and permits necessary to the conduct of its businesses;

               (ii)    maintain and keep its properties in good repair, working
          order and condition, and from time to time make all necessary or
          desirable repairs, renewals and replacements, so that its businesses
          may be properly and advantageously conducted at all times;

                                       19
<PAGE>

               (iii)   pay and discharge when payable all taxes, assessments and
          governmental charges imposed upon its properties or upon the income or
          profits therefrom (in each case before the same becomes delinquent and
          before penalties accrue thereon) and all claims for labor, materials
          or supplies which if unpaid might by law become a lien upon any of its
          property, unless and to the extent that the same are being contested
          in good faith and by appropriate proceedings and adequate reserves (as
          determined in accordance with generally accepted accounting
          principles, consistently applied) have been established on its books
          with respect thereto;

               (iv)    comply with all other material obligations which it
          incurs pursuant to any contract or agreement, whether oral or written,
          express or implied, as such obligations become due, unless and to the
          extent that the same are being contested in good faith and by
          appropriate proceedings and adequate reserves (as determined in
          accordance with generally accepted accounting principles, consistently
          applied) have been established on its books with respect thereto;

               (v)     comply with all applicable laws, rules and regulations of
          all governmental authorities, the violation of which might reasonably
          be expected to have a material adverse effect upon the financial
          condition, operating results or business prospects of the Corporation
          and its Subsidiaries taken as a whole;

               (vi)    maintain proper books of record and account which fairly
          present its financial condition and results of operations and make
          provisions on its financial statements for all such proper reserves as
          in each case are required in accordance with generally accepted
          accounting principles, consistently applied;

               (vii)   comply with all environmental regulations and orders with
          respect to such regulations, provided that this subparagraph shall not
          limit the ability of the Corporation or any Subsidiary thereof to
          contest in good faith any such order or regulation;

               (viii)  apply for and continue in force with good and
          responsible insurance companies adequate insurance covering risks of
          such types and in such amounts as are customary for well-insured
          corporations of similar size engaged in similar lines of business, all
          as determined by the Board,

               (ix)    (A) promptly and in any event within 10 days after
          Acquisition or any ERISA Affiliate knows or has reason to know that
          any ERISA Event has occurred, furnish to CMC a statement of the chief
          financial officer or treasurer of Acquisition describing such ERISA
          Event and the action, if any, that Acquisition or such ERISA Affiliate
          has taken and proposes to take with respect thereto and (B) on the
          date any records, documents or other information must be furnished to
          the PBGC with respect to any Plan pursuant to Section 4010 of ERISA,
          furnish to CMC a copy of such records, documents and information;

                                       20
<PAGE>

               (x)     promptly and in any event within five days after receipt
          thereof by Acquisition or any ERISA Affiliate, furnish to CMC copies
          of each notice from the PBGC stating its intention to terminate any
          Plan or to have a trustee appointed to administer any Plan;

               (xi)    furnish to CMC promptly upon receipt thereof by the
          Company or any ERISA Affiliate, a copy of the annual actuarial
          valuation report of each Plan; and

               (xii)   promptly and in any event within ten days after receipt
          thereof by Acquisition or any ERISA Affiliate from the sponsor of a
          Multiemployer Plan, furnish to CMC copies of each notice concerning
          (i) the imposition of Withdrawal Liability by any such Multiemployer
          Plan, (ii) the reorganization or termination, within the meaning of
          Title IV of ERISA, of any such Multiemployer Plan or (iii) the amount
          of liability incurred, or that may be incurred, by Acquisition or any
          ERISA Affiliate in connection with any event described in clause (i)
          or (ii).

          (c)  Each Stockholder shall in his capacity as a stockholder of the
     Corporation, cause that the Corporation observe and perform its obligations
     under Section 4(a) and Section 4(b).

     SECTION 5.  First Refusal Rights for Securities Issued by the Corporation.
                 -------------------------------------------------------------

          (a)  Except for the issuance of Securities in connection with an
     Exempt Issuance, if the Corporation authorizes the issuance and sale to any
     other Person of any Securities or any securities containing options or
     rights to acquire any Securities (the "First Refusal Securities"), the
     Corporation will first offer to sell to each Stockholder a portion of the
     First Refusal Securities in an amount equal to such Stockholder's
     Proportionate Percentage of the First Refusal Securities (the "First
     Refusal Amount"). Each Stockholder will be entitled to purchase the First
     Refusal Securities at the same price per share and on the same terms as the
     First Refusal Securities are to be offered to such other Person.

          (b)  Each Stockholder must exercise its purchase rights hereunder
     within 20 days after receipt of written notice from the Corporation
     describing in reasonable detail the First Refusal Securities being offered,
     the purchase price per share, the payment terms and such Stockholder's
     Proportionate Percentage and First Refusal Amount.  If all of the First
     Refusal Securities offered to the Stockholders are not fully subscribed by
     such Stockholders, the remaining First Refusal Securities will be reoffered
     to the Stockholders purchasing their entire First Refusal Amount upon the
     terms set forth in this Section until all such First Refusal Securities are
     fully subscribed or until all such Stockholders have subscribed for all
     such First Refusal Securities which they desire to purchase, except that
     such Stockholders must exercise their purchase rights within 5 days after
     receipt of all such reoffers.

          (c)  Upon the expiration of the offering periods described above, the
     Corporation will be free to sell such First Refusal Securities which such
     Stockholders

                                       21
<PAGE>

     have not elected to purchase during the 60 days following such expiration,
     on terms and conditions no more favorable to the purchasers thereof than
     those offered to such Stockholders. Any First Refusal Securities offered or
     sold by the Corporation after such 60-day period must be reoffered to the
     Stockholders pursuant to the terms of this Section.

          (d)  Payment for First Refusal Securities which a Stockholder has
     elected to purchase shall be made against delivery of (i) the certificates
     representing the First Refusal Securities at the principal office of the
     Corporation not earlier than 10 days nor later than 20 days after
     expiration of the 20 days or 5 days referred to in Section 5(b), as the
     case may be, and (ii) of the entire price, by cash, certified or bank
     cashier's check, or such other consideration specified in the Corporation's
     offer.

     SECTION 6.  Affiliate Transactions.
                 ----------------------

          Payments made by the Corporation to DGHA pursuant to the Management
Services Agreement shall be the only payments permitted to be made by the
Corporation to DGHA and its Affiliates without the consent of a majority of the
Institutional Directors.

     SECTION 7.  Issuance of Additional Securities to DGHA Stockholders and
                 ----------------------------------------------------------
Manager Stockholders.
--------------------

          (a)  The Corporation shall have the right, but not the obligation, to
     issue to the Manager Stockholders from time to time, at the discretion of
     the Board, any portion of the Manager Restricted Shares that are not issued
     and outstanding on or after the date hereof, at a purchase price of $.01
     per share; provided, however, that it shall be a condition precedent of the
                --------  -------
     issue of any Manager Restricted Shares that each Manager Stockholder to
     whom any Manager Restricted Shares are issued shall have executed and
     delivered to the Corporation a counterpart signature page to this Agreement
     and the Manager Repurchase Agreement, pursuant to which such Manager
     Stockholder agrees to be bound by the provisions of this Agreement and the
     Manager Repurchase Agreement.

          (b)  The Corporation shall have the right, but not the obligation, to
     issue to the DGHA Stockholders from time to time, at the discretion of the
     Chairman of the Corporation, any portion of the DGHA Restricted Shares that
     are not issued and outstanding on or after the date hereof, at a purchase
     price of $.01 per share; provided, however, that it shall be a condition
                              --------  -------
     precedent of the issue of any DGHA Restricted Shares that each DGHA
     Stockholder to whom any DGHA Restricted Shares are issued shall have
     executed and delivered to the Corporation a counterpart signature page of
     this Agreement and the DGHA Repurchase Agreement, pursuant to which such
     DGHA Stockholder agrees to be bound by the provisions of this Agreement and
     the DGHA Repurchase Agreement.

     SECTION 8.  Limitations on Transfers of Stock - General.
                 -------------------------------------------

          (a)  The provisions regarding Transfers of Securities contained herein
     shall apply to all Securities now owned or hereafter acquired by a
     Stockholder, including Securities acquired by reason of any dividend,
     distribution, exchange or conversion, additional issuances of Securities,
     and acquisitions of outstanding Securities from another

                                       22
<PAGE>

     Person, and such provisions shall apply to any Securities obtained by a
     Stockholder upon the exercise, exchange or conversion of any option,
     warrant or other Security.

          (b)  No Stockholder shall Transfer any Security to a Person not
     already a party to this Agreement as a Stockholder unless and until such
     Person executes and delivers to the Corporation a written agreement in form
     and substance reasonably acceptable to the Corporation pursuant to which
     such Person shall agree to become a party to, and to be bound by and to
     comply with the provisions of, this Agreement in the same capacity and to
     the same extent as the Stockholder Transferring such Security. In the event
     of any Transfer to an Affiliate contemplated by clauses (i) (A) or (i)(B)
     of the definition thereof, the Transferee shall grant an irrevocable proxy,
     which shall be deemed to be coupled with an interest, with respect to
     voting rights of such Securities to D. George Harris (or, if D. George
     Harris is no longer a Stockholder or if the transferor is D. George Harris,
     to Anthony J. Petrocelli and if Anthony J. Petrocelli is no longer a
     Stockholder, to an individual elected by a majority of the Board), which
     proxy shall expire upon an Initial Public Offering. Any Transfer of
     Securities that is not made in compliance with the provisions hereof shall
     be void ab initio.

          (c)  Any provision of this Agreement to the contrary notwithstanding,
     no Stockholder shall (i) Transfer any Security to a Person which is a
     Competitor or to any Affiliates of a Competitor, (ii) effect any Transfer
     which would subject the Corporation to the reporting requirements of the
     Exchange Act or (iii) Transfer any Security to any Person if such Transfer
     would result in an event of default under any Debt Document.

          (d)  The restrictions on Transfer contained in Sections 9, 10, 11 and
     12 shall not apply with respect to any Transfer of Securities by any
     Stockholder to its Affiliates.

     SECTION 9.   Limitations on Transfers of Restricted Shares.
                  ---------------------------------------------

          Except as permitted by Section 8(d) or pursuant to Section 13, no
Stockholder shall Transfer any Class C Restricted Shares at any time that the
Class C Restricted Shares shall be subject to the restrictions contained in the
DGHA Repurchase Agreement or the Manager Repurchase Agreement.

     SECTION 10.  Limitations on Transfers prior to Third Anniversary.
                  ---------------------------------------------------

          Except as permitted by Section 8(d) or pursuant to Section 13 or
Section 14 and except for sales of Securities by Manager Stockholders (to which
CMC shall have consented in its sole discretion) and Non-Affiliated Stockholders
to DGHA Stockholders or Manager Stockholders on or prior to December 31, 1998 at
a price per share equal to $39.90 for Series B Preferred Stock, $39.90 for Class
A Common Stock and $7.78 for Series A Preferred Stock, plus accrued dividends,
no Stockholder shall Transfer any Securities prior to the third anniversary of
the Original Agreement Date.

     SECTION 11.  Rights of First Refusal after Third Anniversary.
                  -----------------------------------------------

          Except for Transfers permitted by Section 8(d) or Section 13 and
except for sales of Securities by Manager Stockholders (to which CMC shall have
consented in its sole

                                       23
<PAGE>

discretion) and Non-Affiliated Stockholders to DGHA Stockholders or Manager
Stockholders on or prior to December 31, 1998 at a price per share equal to
$39.90 for Series B Preferred Stock, $39.90 for Class A Common Stock and $7.78
for Series A Preferred Stock, plus accrued dividends, on or after the third
anniversary of the Original Agreement Date the Stockholders shall comply with
the following procedures in connection with any Transfer of Securities:

          (a)  The Stockholder ("Offeror") shall first deliver to the
     Corporation a written notice (hereinafter in this Section 11 called the
     "Notice of Offer"), which shall be irrevocable for a period of 60 days
     after delivery thereof, offering (the "Offer") to the Corporation and the
     other Stockholders (the "Offerees") all of the Securities proposed to be
     Transferred by the Offeror at the purchase price and on the terms specified
     therein (which Notice of Offer shall include all relevant terms of the
     proposed Transfer). The Offeror shall also furnish to the Corporation such
     additional information relating to the Offer as may reasonably be requested
     by the Corporation. The Corporation shall have the right and option, for a
     period of 30 days after delivery of the Notice of Offer by the Offeror, to
     accept all or any portion of the Securities so offered at the purchase
     price and on the terms stated in the Notice of Offer. The Corporation
     shall, if it does not elect to purchase all of the offered Securities,
     deliver a copy of the Notice of Offer to the Offerees. Each Offeree shall
     have the right and option, for a period of 30 days after delivery of the
     Notice of Offer by the Corporation, by delivery of written notice to the
     Corporation (x) to accept all or any of its Proportionate Percentage of the
     Securities so offered at the purchase price and on the terms stated in the
     Notice of Offer and (y) to offer to purchase any Securities not accepted by
     the other Offerees, in which case the Securities not accepted by the other
     Offerees, shall be deemed to have been offered to and accepted by the
     Offerees, which exercised their option under this clause (y) pro rata in
                                                                  --- ----
     accordance with their respective Proportionate Percentages (computed
     without including the Offerees, who have not exercised their option to
     purchase Securities under this clause (y)), on the above-described terms
     and conditions, and if all of the offered Securities shall not have been
     fully subscribed by such Offerees, the remaining offered Securities will be
     reofferred to the Offerees who agreed to purchase their entire entitlement
     of offered Securities under clause (x) upon the terms set forth in this
     Section until all such Securities are fully subscribed or until all such
     Offerees have subscribed for all such offered Securities which they desire
     to purchase, except that such Offerees must exercise their purchase rights
     within five (5) business days after receipt of all such reoffers.
     Notwithstanding the foregoing provisions of this Section 11(a), if the
     Offeror is a DGHA Stockholder, a Manager Stockholder, a Non-Affiliated
     Stockholder or an Institutional Stockholder, the other DGHA Stockholders,
     Manager Stockholders, Non-Affiliated Stockholders or Institutional
     Stockholders, as the case may be, shall have the right to purchase, on a
     pro rata basis among such Stockholders, all of the Securities so offered
     --- ----
     prior to any purchases by any other Stockholders.

          (b)  Transfers of Securities under the terms of this Section 11 shall
     be made at the offices of the Corporation on a mutually satisfactory
     business day within 15 days after the expiration of the applicable time
     periods.  Delivery of certificates or other instruments evidencing such
     Securities, duly endorsed for transfer and free and clear of all liens and
     encumbrances, shall be made on such date against payment of the purchase
     price therefor.

                                       24
<PAGE>

          (c)  If the Corporation and the Offerees shall not have accepted to
     purchase all the Securities offered for sale pursuant to the aforesaid
     Notice of Offer, then the Offeror may Transfer to a third party that number
     of the Securities not accepted by the Corporation and the Offerees at the
     price and on substantially equivalent terms stated in the original Notice
     of Offer, at any time within 180 days after the expiration of the Offers
     required by Section 11(a).  In the event the Securities are not Transferred
     by the Offeror on such terms during such 180-day period, the restrictions
     of this Section 11 shall again become applicable to any Transfer of
     Securities by the Offeror unless within such 180-day period the Offeror
     shall deliver to the Corporation a Notice of Offer with respect to an Offer
     of the same Securities at a purchase price which is less than the purchase
     price set forth in the previous Offer, in which case the 30-day period
     specified in Section 11(a) shall be reduced to 15 days and a new 180-day
     period shall begin.  Nothing in this Section 11 shall preclude any
     Stockholder from engaging in discussions with any investment banker,
     potential transferee of Securities or other Person with respect to a
     possible purchase of Securities from it, so long as the provisions of this
     Section 11 are complied with prior to the consummation of any Transfer to
     which this applies.

          (d)  The Offeror may specify in the Notice of Offer that all
     Securities mentioned therein must be Transferred, in which case any
     acceptance received pursuant to Section 11(a) shall be deemed conditioned
     upon (x) receipt of written notices of binding acceptance with respect to
     all Securities mentioned in such Notice of Offer or (y) the Transfer of the
     remaining Securities pursuant to Section 11 (c).

     SECTION 12.  Rights of Co-Sale.
                  -----------------

          (a)  Subject to the provisions of Section 12(c), in the event that on
     or after the third anniversary of the Original Agreement Date a Stockholder
     or group of Stockholders (hereinafter, a "Section 12 Offeree") receives a
     bona fide offer (the "Section 12 Offer") from a third party which is not an
     ---- ----
     Affiliate of the Section 12 Offeree (the "Section 12 Offeror") to purchase
     from such Section 12 Offeree Securities, for a specified price payable in
     cash or otherwise and on specified terms and conditions, such Section 12
     Offeree shall promptly forward a notice (the "Section 12 Notice") complying
     with Section 12(b) to the Corporation and to the other Stockholders (the
     Stockholders receiving a Section 12 Notice collectively referred to herein
     as the "Other Stockholders").  The Section 12 Offeree shall not Transfer
     any Securities prior to the expiration of the 15-day period referred to
     below to the Section 12 Offeror unless the terms of the Section 12 Offer
     are extended to each Other Stockholder with respect to its Proportionate
     Percentage of the aggregate number and classes of Securities to which the
     Section 12 Offer relates, whereupon each Other Stockholder shall be
     entitled to Transfer such Other Stockholder's Proportionate Percentage of
     the aggregate number of Securities to which the Section 12 Offer relates.
     Each Other Stockholder shall have a period of 15 days to deliver a written
     notice (the "Section 12 Acceptance") to the Section 12 Offeree evidencing
     its acceptance of the Section 12 Offer.

          (b)  The Section 12 Notice shall set forth (i) the number of
     Securities to which the Section 12 Offer relates and the name of the
     Section 12 Offeree, (ii) the name and address of the Section 12 Offeror,
     (iii) the proposed amount and type of consideration

                                       25
<PAGE>

     (including, if the consideration consists in whole or in part of non-cash
     consideration, such information to the Section 12 Offeree as may be
     reasonably necessary for the Other Stockholders to properly analyze the
     economic value and investment risk of such non-cash consideration) and the
     terms and conditions of payment offered by the Section 12 Offeror and (iv)
     that the Section 12 Offeror has been informed of the co-sale rights
     provided for in this Section 12, and has agreed to purchase Securities held
     by the Other Stockholders in accordance with the terms of this Section 12
     (which agreement may contain the Section 12 Offeror's obligation to
     purchase all of the Securities held by the Other Stockholders subject to
     the Section 12 Offer from the Section 12 Offeree so long as such Section 12
     Offeree agrees to purchase simultaneously with such sale from the Other
     Stockholders if they deliver a Section 12 Acceptance the Securities held by
     the Other Stockholders subject to such Section 12 Notice of Acceptance).

          (c)  The foregoing provisions of this Section 12 shall not apply to a
     Transfer or Transfer(s) by a Stockholder or group of Stockholders of up to
     the greater of (i) 0.50% of the Common Equivalents outstanding at such
     time, and (ii) 10% of the Securities held by such Stockholder or group of
     Stockholders at such time.

     SECTION 13.  Drag-Along Rights.
                  -----------------

          (a)     If the Requisite Stockholders approve a sale of all or
     substantially all of the capital stock or assets of the Company to a Person
     which is not an Affiliate of any Stockholder (other than an Affiliate of a
     DGHA Stockholder) (an "Approved Sale"), whether by way of merger,
     consolidation, sale of stock or assets, or otherwise (each, a "Sale of the
     Company"), all Stockholders shall consent to and raise no objections
     against the Approved Sale, and if the Approved Sale is structured as (A) a
     merger or consolidation of the Corporation or a Subsidiary, or a sale of
     all or substantially all of the assets of the Corporation or a Subsidiary,
     each Stockholder shall waive any dissenters rights, appraisal rights or
     similar rights in connection with such merger, consolidation or asset sale,
     or (B) a sale of all the capital stock of the Corporation or a Subsidiary,
     the Stockholders shall agree to sell their Securities on the terms and
     conditions approved by the Requisite Stockholders. The Stockholders shall
     take all necessary and desirable actions approved by the Requisite
     Stockholders, in connection with the consummation of the Approved Sale,
     including the execution of such agreements and such instruments and other
     actions reasonably necessary to (1) provide the representations,
     warranties, indemnities, covenants, conditions, non-compete agreements,
     escrow agreements and other provisions and agreements relating to such
     Approved Sale and (2) effectuate the allocation and distribution of the
     aggregate consideration upon the Approved Sale as set forth below. The
     Stockholders shall be permitted to sell their Securities pursuant to an
     Approved Sale without complying with the provisions of Sections 8, 9, 10,
     11 or 12 of this Agreement.

          (b)     The obligations of the Stockholders pursuant to this Section
     13 are subject to the satisfaction of the following conditions:

                  (i)  subject to Section 13(b)(iii), upon the consummation of
          the Approved Sale, all of the Stockholders shall receive the same
          proportion of the

                                       26
<PAGE>

          aggregate consideration from such Approved Sale that such holder would
          have received if such aggregate consideration had been distributed by
          the Corporation in complete liquidation pursuant to the rights and
          preferences set forth in the Certificate as in effect immediately
          prior to such Approved Sale (giving effect to applicable orders of
          priority) and after giving effect to the purchase rights (if any) set
          forth in the DGHA Repurchase Agreement and the Manager Repurchase
          Agreement;

                (ii)   if any Stockholders of a class are given an option as to
          the form and amount of consideration to be received, all holders of
          such class will be given the same option;

                (iii)  all holders of then-currently exercisable Common
          Equivalents will be given an opportunity to either (A) exercise such
          rights prior to the consummation of the Approved Sale (but only to the
          extent such Common Equivalents are then vested) and participate in
          such sale as Stockholders or (B) upon the consummation of the Approved
          Sale, receive in exchange for such Common Equivalents consideration
          equal to the amount determined by multiplying (x) the same amount of
          consideration per share of Common Stock (of the same class as that for
          which the Common Equivalent is exercisable) received by the holders of
          such class of Common Stock in connection with the Approved Sale less
          the exercise price per Common Equivalent by (y) the number of
          Common Equivalents;

                (iv)   no Stockholder shall be obligated to make any out-of-
          pocket expenditure prior to the consummation of the Approved Sale
          (excluding modest expenditures for postage, copies, etc.) and no
          Stockholder shall be obligated to pay more than his pro rata share
          (based upon the amount of consideration received) of reasonable
          expenses incurred in connection with a consummated Approved Sale to
          the extent such costs are incurred for the benefit of all Stockholders
          and are not otherwise paid by the Corporation or the acquiring party
          (costs incurred by or on behalf of a Stockholder for its or his sole
          benefit will not be considered costs of the transaction hereunder),
          provided that a Stockholder's liability for such expenses shall be
          capped at the total purchase price received by such Stockholder for
          his Securities (including the exercise price thereof); and

                (v)    in the event that the Stockholders are required to
          provide any representations or indemnities in connection with the
          Approved Sale (other than representations and indemnities concerning
          each Stockholder's valid ownership of his Securities, free of all
          liens and encumbrances (other than those arising under applicable
          securities laws), and each Stockholder's authority, power, and right
          to enter into and consummate such purchase or merger agreement without
          violating any other agreement), then each Stockholder shall not be
          liable for more than his pro rata share (based upon the number of
          Securities held and not the amount of consideration received) of any
          liability for misrepresentation or indemnity and such liability shall
          not exceed the total purchase price received by such Stockholder for
          his Securities (including the exercise price thereof), after taxes

                                       27
<PAGE>

          (after giving effect to all potential amendments of tax returns
          arising in connection with any indemnification claim) and expenses,
          and such liability shall be satisfied solely out of any funds escrowed
          for such purpose.

          (c)     If the Corporation and any of the Stockholders or their
     representatives, enter into any negotiation or transaction for which Rule
     506 under the Securities Act (or any similar rule then in effect) may be
     available with respect to such negotiation or reaction (including a merger,
     consolidation or other reorganization), each Stockholder who is not an
     accredited investor (as such term is defined in Rule 501 under the
     Securities Act) will, at the request of the Corporation or the
     Institutional Stockholders, appoint a purchaser representative (as such
     term is defined in Rule 501 under the Securities Act) reasonably acceptable
     to the Corporation or such Stockholders.

     SECTION 14.  Options Upon Termination Event.
                  ------------------------------

          (a)     Upon the occurrence of a Termination Event with respect to a
     Stockholder who is a Manager Stockholder or a DGHA Stockholder (except a
     Termination Event described in Section 14(d)(ii)(1) or (2) with respect to
     a Stockholder who is a DGHA Stockholder), in each case occurring on or
     prior to the fifth anniversary of the Original Agreement Date (or at any
     time with respect to a Termination Event described in Section 14(d)(i)(1)
     or (2) with respect to a Stockholder who is a Manager Stockholder), subject
     to Section 14(c), the Corporation shall have the right but not the
     obligation to purchase any or all of such Stockholder's (the "Retiring
     Stockholder") Securities (other than Class C Restricted Shares) (the
     "Retiring Shares").  The Corporation shall have 20 days after the
     occurrence of any Termination Event described above in which to give notice
     (the "Primary Retirement Notice") to the Retiring Stockholder of its
     election to purchase all of the Retiring Shares.  The Primary Retirement
     Notice will disclose in reasonable detail the Corporation's election to
     purchase all of the Retiring Shares and the terms and conditions of the
     sale including the price per share of the Retiring Shares.  In the event
     that the Corporation does not elect to purchase all of the Retiring Shares,
     the Corporation shall, within 20 days after the occurrence of any
     Termination Event described above, deliver, on behalf of the Retiring
     Stockholder but at the expense of the Corporation, a written notice (the
     "Secondary Retirement Notice") to the remaining Stockholders (the "Eligible
     Stockholders") and the Retiring Stockholder, which Secondary Retirement
     Notice will disclose in reasonable detail the terms and conditions of the
     sale including the total number of Retiring Shares and the number of
     Retiring Shares, if any, to be purchased by the Corporation and the price
     per share of the Retiring Shares.  Upon receipt of the Secondary Retirement
     Notice, each Eligible Stockholder shall have a right to purchase the
     Retiring Shares which will not be purchased by the Corporation (the "R
     Retiring Shares"), in the case of each Eligible Stockholder, up to that
     number of the Retiring Shares equal to such Eligible Stockholder's Adjusted
     Proportionate Percentage of the Remaining Retiring Shares (such number of
     shares hereinafter referred to as the "Retiring Participation Shares") with
     respect to such Eligible Stockholder.  The Eligible Stockholders shall have
     20 days after the Secondary Retirement Notice is received in which to give
     counter-notice of such Eligible Stockholder's election to purchase such
     Remaining Retiring Shares (such election by an Eligible Stockholder being
     referred to as an "Initial Retiring Purchase").  An Initial Retiring
     Purchase by an Eligible Stockholder

                                       28
<PAGE>

     may be of all or part of his or its Retiring Participation Shares. Any
     Eligible Stockholder may at any time elect in his or its counter-notice to
     purchase, in addition to his or its Retiring Participation Shares, the
     balance (or the balance up to a maximum stated number) of any Remaining
     Retiring Shares being offered to other Eligible Stockholders which are not
     accepted by such other Eligible Stockholders (such acceptance being
     hereinafter referred to as an "Additional Retiring Purchase"). If the
     number of Remaining Retiring Shares that the Eligible Stockholders elect to
     purchase in their Initial Retiring Purchases and Additional Retiring
     Purchases exceeds the number of Remaining Retiring Shares, the number of
     Remaining Retiring Shares to be purchased in the aggregate by all Second
     Priority Eligible Stockholders shall be reduced to the extent of the Excess
     Attributable to the Second Priority Additional Retiring Purchases with such
     reduction in the number of Remaining Retiring Shares to be purchased in the
     aggregate by all Second Priority Eligible Stockholders to be allocated
     among such Second Priority Eligible Stockholders in proportion to the
     number of Remaining Retiring Shares each Second Priority Eligible
     Stockholder has agreed to purchase in such Second Priority Eligible
     Stockholder's Additional Retiring Purchase (the "First Retirement
     Reduction"). If any excess remains after the First Retirement Reduction,
     the number of Remaining Retiring Shares to be purchased in the aggregate by
     all Second Priority Eligible Stockholders shall be further reduced to the
     extent of the Excess Attributable to the Second Priority Initial Retiring
     Purchases with such reduction in the number of Remaining Retiring Shares to
     be purchased in the aggregate by all Second Priority Eligible Stockholders
     to be allocated among such Second Priority Eligible Stockholders in
     proportion to the number of Remaining Retiring Shares each Second Priority
     Eligible Stockholder has agreed to purchase in such Second Priority
     Eligible Stockholder's Initial Retiring Purchase (the "Second Retirement
     Reduction"). If any excess remains after the Second Retirement Reduction,
     the number of Remaining Retiring Shares to be purchased in the aggregate by
     all First Priority Eligible Stockholders shall be reduced to the extent of
     the Excess Attributable to the First Priority Additional Retiring Purchases
     with such reduction in the number of Remaining Retiring Shares to be
     purchased in the aggregate by all First Priority Eligible Stockholders to
     be allocated among such First Priority Eligible Stockholders in proportion
     to the number of Remaining Retiring Shares each First Priority Eligible
     Stockholder has agreed to purchase in such First Priority Eligible
     Stockholder's Additional Retiring Purchase. To the extent possible, any
     mechanical problems shall be solved in any equitable manner determined by
     the Board to be consistent with the intent of the parties hereto.

          (b)  The price per share for Retiring Shares shall be the Valuation
     Price per Share as in effect on the date of the Primary Retirement Notice
     or, in the event that the Corporation does not deliver a Primary Retirement
     Notice, as in effect on the date of the Secondary Retirement Notice (the
     "Notice Date").

          (c)  Upon the occurrence of any Termination Event (except for a
     Termination Event described in Section 14(d)(i)(5) or Section 14(d)(ii)(5)
     with respect to a Stockholder who is a Manager Stockholder or a DGHA
     Stockholder, in each case occurring on or prior to the fifth anniversary of
     the Original Agreement Date (or at any time with respect to a Termination
     Event described in Section 14(d)(i)(1) or (2) or Section 14(d)(ii)(1) or
     (2)), such Stockholder or his or her designated beneficiaries, as the

                                       29
<PAGE>

     case may be, shall be entitled to require, subject to the provisions of the
     next sentence, by written notice delivered to the Corporation within 60
     days of such Termination Event, that the Corporation (or, at the election
     of the Corporation, the Corporation's designee) repurchase for cash not
     less than all Securities (other than Class C Restricted Shares) then held
     by such Stockholder prior to such Termination Event (the "Individual
     Investor Put Shares") at a price per share equal to the Valuation Price per
     Share as of the date of such Termination Event. The Corporation's
     repurchase obligation described in the foregoing sentence shall be in all
     cases subject to any applicable restrictions provided by the Delaware
     General Corporation Law, the Certificate and any applicable restrictions
     and conditions set out in the Debt Documents.

          (d)  As used in this Section 14, a "Termination Event" shall have
     occurred if:

               (i)  a Manager Stockholder's employment with the Corporation or
          any Subsidiary thereof is terminated (and not continued, or
          substantially simultaneously resumed, with the Corporation or any
          Subsidiary thereof) as a result of:

                         (1)  the death of such Manager Stockholder;

                         (2)  the permanent disability (as determined by the
                    Board or the Board of Directors of such Subsidiary, as the
                    case may be, in good faith) of such Manager Stockholder;

                         (3)  the retirement at or above age 65 (or such other
                    age as may be determined by the Compensation Committee) of
                    such Manager Stockholder;

                         (4)  termination by the Corporation or any such
                    Subsidiary of such Manager Stockholder for any reason other
                    than for Cause; or

                         (5)  such Manager Stockholder notifies the Corporation
                    or any such Subsidiary that he is terminating his
                    employment, or the Corporation or any such Subsidiary
                    notifies such Manager Stockholder that the employment of
                    such Manager Stockholder is being terminated for Cause.

               (ii) a DGHA Stockholder's employment with DGHA or any Affiliate
          thereof is terminated (and not continued, or substantially
          simultaneously resumed, with DGHA or any Affiliate thereof) as a
          result of:

                         (1)  the death of such DGHA Stockholder;

                         (2)  the permanent disability (as determined by the
                    Board or the Board of Directors of such Affiliate, as the
                    case may be, in good faith) of such DGHA Stockholder;

                                       30
<PAGE>

                         (3)  the retirement at or above age 70 (or such other
                    age as may be determined by the Compensation Committee) of
                    such DGHA Stockholder;

                         (4)  termination by DGHA or any Affiliate thereof of
                    such DGHA Stockholder for any reason other than for Cause;
                    or

                         (5)  such DGHA Stockholder notifies DGHA or any
                    Affiliate thereof that he is terminating his employment, or
                    DGHA or any Affiliate thereof notifies such DGHA Stockholder
                    that the employment of such DGHA Stockholder is being
                    terminated for Cause.

          (e)  Any repurchase by the Corporation or purchase by an Eligible
     Stockholder of the Individual Investor Put Shares or the Retiring Shares,
     as the case may be, pursuant to this Section 14 shall be effected by
     delivery by the Stockholder or his beneficiaries, as the case may be, of
     the certificate(s) for all such Retiring Shares of Individual Investor Put
     Shares (properly endorsed for transfer) to the appropriate transferee(s) on
     a date five (5) business days after the requisite notice or notices
     pursuant to this Section 14 requiring the repurchase or purchase of all
     such Retiring Shares or Individual Investor Put Shares, as the case may be,
     have been given (the "Transfer Date").  As of the Transfer Date, title to
     such Retiring Shares or Individual Investor Put Shares shall be deemed
     transferred to the respective transferee(s) upon tender by such
     transferee(s) of the purchase price for such Retiring Shares or Individual
     Investor Put Shares to the Stockholder or his designated beneficiaries by a
     check or checks in New York Clearing House funds or by a wire transfer to
     the account of the Stockholder or his designated beneficiaries.

          (f)  Notwithstanding anything to the contrary contained in this
     Section 14, the Corporation and the Retiring Stockholder (in the case of a
     repurchase contemplated by Section 14(a)) or the Corporation and the
     Manager Stockholder or DGHA Stockholder or his or her designated
     beneficiaries (in the case of a repurchase contemplated by (Section 14(c)),
     as the case may be, shall have the right and option to elect (the "Deferral
     Election"), pursuant to a written agreement duly executed by such persons,
     to deem the date of the relevant Termination Event to be deferred for
     purposes of this Section 14 until a date (the "Deferral Date") not more
     than six years following the date of the Deferral Election. A Deferral
     Election must be made within 90 days of the occurrence of the relevant
     Termination Event. A Deferral Election shall be effective solely to defer
     for purposes of this Section 14 the date of a Termination Event until the
     Deferral Date specified in, or determined pursuant to, such Deferral
     Election (at which time Sections 14(a) and 14(c) shall be applicable
     according to their respective terms) and such Deferral Election shall not
     otherwise affect the rights or obligations of any party hereto.

     SECTION 15.  Required Sale.
                  -------------

          Notwithstanding anything contained herein to the contrary if, at any
time on or after the fourth anniversary of the Original Agreement Date, an IRR
Event shall not have occurred, the Majority of the Institutional Stockholders
shall have the right, at any time, to serve

                                       31
<PAGE>

written notice on the Corporation of the desire of the Majority of the
Institutional Stockholders to effect a Sale of the Company. The DGHA
Stockholders shall have the exclusive right for a period of 180 days (the
"Exclusive Period"), commencing on the date of the determination of "Fair Value"
(as hereinafter defined) to consummate either a Sale of the Company at Fair
Value or the acquisition of the Institutional Securities, at a price equal to
what the Institutional Stockholders would receive for the Institutional
Securities if a Sale of the Company was consummated at Fair Value after giving
effect to the provisions of the DGHA Repurchase Agreement and the Manager
Repurchase Agreement. "Fair Value" means the highest price that would be paid
for all or substantially all of (i) the Securities, (ii) the capital stock of a
Subsidiary, (iii) the assets of the Corporation (after the assumption of all of
the liabilities of the Corporation), or (iv) the assets of a Subsidiary (after
the assumption of all the liabilities of such Subsidiary), as the case may be,
and in each case, on a going-concern basis in a single arm's-length transaction
between a willing buyer and a willing seller in an orderly process, using
valuation techniques then prevailing in the securities industry and assuming
full disclosure of all relevant information and a reasonable period of time for
effectuating such sale, as determined jointly by the Majority of the
Institutional Stockholders and the Majority of the DGHA Stockholders. If such
parties are unable to reach agreement within 30 days, such Fair Value shall be
determined by an independent nationally recognized investment bank experienced
in valuing companies or assets jointly selected by the Majority of the
Institutional Stockholders and the Majority of the DGHA Stockholders. If the
parties cannot agree on the selection of an investment bank within 30 days, the
investment bank will be selected by an independent arbitrator appointed in
accordance with the rules of the American Arbitration Association. The
determination of such investment bank shall be final and binding upon the
parties, and the Corporation shall pay the fees and expenses of such investment
bank.

     SECTION 16.  Regulatory Matters.
                  ------------------

          (a)     Regulatory Compliance Cooperation.
                  ---------------------------------

                  (i)  If a Stockholder determines that it has a Regulatory
          Problem, the Corporation agrees to take all such actions as are
          reasonably requested by such Stockholder (x) to effectuate and
          facilitate any Transfer by such Stockholder of any Securities (as
          defined below) of the Corporation then held by such Stockholder to any
          Person designated by such Stockholder, (y) to permit such Stockholder
          (or any Affiliate of such Stockholder) to exchange all or any portion
          of the voting Securities then held by such Person on a share-for-share
          basis for shares of a class of nonvoting Securities of the
          Corporation, which nonvoting Securities shall be identical in all
          respects to such voting Securities, except that such new Securities
          shall be nonvoting and shall be convertible into voting Securities on
          such terms as are requested by such Stockholder in light of regulatory
          considerations then prevailing, and (z) to continue and preserve the
          respective allocation of the voting interests with respect to the
          Corporation provided for in the Certificate and this Agreement and
          with respect to such Stockholder's ownership of the Corporation's
          voting Securities.  Such actions may include, without limitation, (x)
          entering into such additional agreements as are reasonably requested
          by such Stockholder to permit any Person(s) designated by such
          Stockholder to exercise any voting power which is relinquished by such

                                       32
<PAGE>

          Stockholder upon any exchange of voting Securities for nonvoting
          Securities of the Corporation; and (y) entering into such additional
          agreements, adopting such amendments to this Agreement, the
          Certificate and the Bylaws of the Corporation and taking such
          additional actions as are reasonably requested by such Stockholder in
          order to effectuate the intent of the foregoing; provided, however
          that such actions will not change materially any of the agreements,
          rights or obligations of the parties reflected herein or in the
          Certificate or the Bylaws.

                  (ii)  Before the Corporation redeems, purchases or otherwise
          acquires, directly or indirectly, or converts or takes any action with
          respect to the voting rights of, any Securities, the Corporation shall
          give written notice of such pending action to each Stockholder.  Upon
          the written request of any Stockholder made within 10 days after its
          receipt of such notice stating that after giving effect to such action
          such Stockholder would have a Voting Regulatory Problem, the
          Corporation shall defer taking such action for such period (not to
          extend beyond 45 days after such Stockholder's receipt of the
          Corporation's original notice) as such Stockholder requests to permit
          it and its Affiliates to reduce the quantity of Securities they own or
          take other appropriate action in order to avoid the Voting Regulatory
          Problem.  In addition, in the event that the Corporation shall be a
          party to any merger, consolidation, recapitalization or other
          transaction pursuant to which any Stockholder would be required to
          take any voting Securities, or any Securities convertible into, or
          exchangeable or exercisable for, voting Securities, which might
          reasonably be expected to cause such Stockholder to have a Voting
          Regulatory Problem, then the Corporation shall not be a party to such
          transaction unless such Stockholder shall receive non-voting
          Securities.

          (b)  Cooperation of Other Stockholders. Each Stockholder agrees to
               ---------------------------------
     cooperate with the Corporation in complying with Section 16(a) above,
     including without limitation, voting to approve amending the Certificate,
     this Agreement or the Bylaws in a manner reasonably requested by the
     Stockholder requesting such amendment.

          (c)  Covenant Not to Amend.  The Corporation and each Stockholder
               ---------------------
     agree not to amend or waive the voting or other provisions of the
     Certificate, this Agreement or the Bylaws if such amendment or waiver would
     cause any Stockholder to have a Voting Regulatory Problem, provided that
     any such Stockholder notifies the Corporation that it would have a Voting
     Regulatory Problem promptly after it has notice of such amendment or
     waiver.

     SECTION 17.  Requisite Stockholder Approval.
                  ------------------------------

          Each Stockholder agrees to consider in good faith any proposal or
proposals made by the Corporation for a Stockholder vote (with or without a
meeting), or for a Stockholder or Stockholders to take any other action or
actions, that the Corporation deems reasonably advisable in connection with
achieving a Requisite Stockholder Approval.  The Corporation shall make one or
more proposals for a Stockholder vote (with or without a meeting), or for a
Stockholder or Stockholders to take any other action or actions, that the
Corporation deems reasonably advisable in connection with achieving a Requisite
Stockholder Approval.

                                       33
<PAGE>

     SECTION 18.  Amendment and Waiver.
                  --------------------

          (a)     Except as expressly set forth herein, the provisions of this
     Agreement may only be amended or waived with the prior written consent of
     the Corporation, a Majority of the Institutional Stockholders and a
     Majority of the DGHA Stockholders; provided, however, that Schedule 1 to
     this Agreement shall be deemed to be automatically amended from time to
     time to reflect issuances and Transfers of Securities made in accordance
     with the terms hereof without requiring the consent of any party, and the
     Corporation will, upon request, distribute to any Stockholder a revised
     Schedule 1 to reflect any such changes.

          (b)     No course of dealing between the Corporation, its Subsidiaries
     and the Stockholders (or any of them) or any delay in exercising any rights
     hereunder will operate as a waiver of any rights of any party to this
     Agreement.

          (c)     For purposes of this Agreement, shares of capital stock held
     by the Corporation or any Subsidiaries will not be deemed to be
     outstanding.

          (d)     The failure of any party to enforce any of the provisions of
     this Agreement will in no way be construed as a waiver of such provisions
     and will not affect the right of such party thereafter to enforce each and
     every provision of this Agreement in accordance with its terms.

     SECTION 19.  Securities Law Compliance; Legends.
                  ----------------------------------

          (a)     Restriction on Transfer. No Stockholder shall Transfer
                  -----------------------
     Restricted Securities except in compliance with the conditions specified in
     this Agreement or pursuant to a Public Sale.

          (b)     Restrictive Legends.  Each certificate for the Restricted
                  -------------------
     Securities shall (unless otherwise provided by the provisions of Section
     19(d)) be stamped or otherwise imprinted with a legend in substantially the
     following terms:

          THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE BEEN
          ACQUIRED FOR INVESTMENT AND HAVE NOT BEEN REGISTERED UNDER
          THE UNITED STATES SECURITIES ACT OF 1933 OR ANY STATE
          SECURITIES OR BLUE SKY LAWS. THESE SECURITIES MAY NOT BE
          SOLD OR TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR
          AN EXEMPTION THEREFROM UNDER SAID ACT OR LAWS.

          (c)     Notice of Transfer.   The holder of any Restricted Securities,
                  ------------------
     by its acceptance or purchase thereof, agrees, prior to any Transfer of any
     such Restricted Securities (except pursuant to an effective registration
     statement), to give written notice to the Corporation of such holder's
     intention to effect such Transfer and agrees to comply in all other
     respects with the provisions of this Section 19. Each such notice shall
     describe the manner and circumstances of the proposed Transfer and, unless
     waived by the Corporation, shall be accompanied by the written opinion,
     addressed to the

                                       34
<PAGE>

     Corporation, of counsel for the holder of such Restricted Securities (which
     counsel shall be reasonably satisfactory to the Corporation), stating that
     in the opinion of such counsel (which opinion shall be reasonably
     satisfactory to the Corporation) such proposed Transfer does not involve a
     transaction requiring registration or qualification of such Restricted
     Securities under the Securities Act or the securities laws of any state of
     the United States. Subject to complying with the other applicable
     provisions hereof, such holder of Restricted Securities shall be entitled
     to consummate such Transfer in accordance with the terms of the notice
     delivered by it to the Corporation if the Corporation does not object (on
     the basis that such Transfer violates the provisions of this Section 19) to
     such Transfer within five days after the delivery of such notice. Each
     certificate or other instrument evidencing the securities issued upon the
     Transfer of any Restricted Securities (and each certificate or other
     instrument evidencing any untransferred balance of such Securities) shall
     bear the legend set forth in Section 19(b) unless (i) in such opinion of
     such counsel registration of future Transfer is not required by the
     applicable provisions of the Securities Act or the securities laws of any
     state of the United States or (ii) the Corporation shall have waived the
     requirement of such legend.

          (d)   Removal of Legends, Etc.  Notwithstanding the foregoing
                -----------------------
     provisions of this Section 19, the restriction imposed by Sections 19(a),
     (b) and (c) upon the transferability of any Restricted Securities shall
     cease and terminate when (i) any such Restricted Securities are sold or
     otherwise disposed of in accordance with the intended method of disposition
     by the seller or sellers thereof set forth in a registration statement or
     are sold or otherwise disposed of in a transaction contemplated by Section
     19(c) which does not require that the securities transferred bear the
     legend set forth in Section 19(b), or (ii) the holder of such Restricted
     Securities has met the requirement of transfer of such Restricted
     Securities pursuant to subparagraph (k) of Rule 144. Whenever the
     restrictions imposed by Sections 19(a), (b) and (c) shall terminate, as
     herein provided, the holder of any Restricted Securities shall be entitled
     to receive from the Corporation, without expense, a new certificate not
     bearing the restrictive legend set forth in Section 19(b) and not
     containing any other reference to the restrictions imposed by Sections
     19(a), (b) and (c).

          (e)   Additional Legend.  Each certificate evidencing Securities
                -----------------
     and each certificate issued in exchange for or upon the Transfer of any
     Securities (if such shares remain Securities as defined herein after such
     Transfer) shall be stamped or otherwise imprinted with a legend in
     substantially the following form:

          "THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE ALSO
          SUBJECT TO A STOCKHOLDERS AGREEMENT DATED AS OF FEBRUARY 9,
          1996 AMONG THE ISSUER OF SUCH SECURITIES (THE "COMPANY") AND
          CERTAIN OF THE COMPANY'S STOCKHOLDERS. THE TERMS OF SUCH
          STOCKHOLDERS AGREEMENT INCLUDE, AMONG OTHER THINGS, VOTING
          AGREEMENTS, REPURCHASE AGREEMENTS AND RESTRICTIONS ON
          TRANSFERS. A COPY OF SUCH STOCKHOLDERS AGREEMENT WILL BE
          FURNISHED WITHOUT

                                       35
<PAGE>

          CHARGE BY THE COMPANY TO THE HOLDER HEREOF UPON WRITTEN
          REQUEST."

The Corporation shall imprint such legends on certificates evidencing shares
outstanding prior to the date hereof.  The legend set forth above shall be
removed from the certificates evidencing any shares which cease to be Securities
in accordance with the terms of this Agreement.

     SECTION 20.  Duration of Agreement.
                  ---------------------

          The rights and obligations of each Stockholder under this Agreement
shall terminate as to such Stockholder upon the earliest to occur of (a) the
Transfer of all Securities owned by such Stockholder and (b) the consummation of
an IRR Event.

     SECTION 21.  Severability.
                  ------------

          Whenever possible, each provision of this Agreement will be
interpreted in such manner as to be effective and valid under applicable law,
but if any provision of this Agreement is held to be invalid, illegal or
unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability will not affect
any other provision or any other jurisdiction, and such invalid, void or
otherwise unenforceable provisions shall be null and void.  It is the intent of
the parties, however, that any invalid, void or otherwise unenforceable
provisions be automatically replaced by other provisions which are as similar as
possible in terms to such invalid, void or otherwise unenforceable provisions
but are valid and enforceable to the fullest extent permitted by law.

     SECTION 22.  Entire Agreement.
                  ----------------

          This document embodies the complete agreement and understanding among
the parties hereto with respect to the subject matter hereof and supersedes and
preempts any prior understandings, agreements or representations by or among the
parties, written or oral, which may have related to the subject matter hereof in
any way.

     SECTION 23.  Certain Stockholders.
                  --------------------

          If any Stockholder is an entity that was formed for the purpose of
acquiring Securities or that has no substantial assets other than Securities or
interests in Securities, such Stockholder agrees that (a) shares of its common
stock or other instruments reflecting equity interests in such entity (and the
shares of common stock or other equity interests in any similar entities
controlling such entity) will note the restrictions contained in this Agreement
on the transfer of Securities as if such common stock or other equity interests
were Securities and (b) no shares of such common stock or other equity interests
may be transferred to any Person other than in accordance with the terms and
provisions of this Agreement as if such common stock or other equity interests
were Securities.

     SECTION 24.  Successors and Assigns.
                  ----------------------

          Except as otherwise provided herein, this Agreement will bind and
inure to the benefit of and be enforceable by the Corporation and its successors
and assigns and the

                                       36
<PAGE>

Stockholders and any subsequent holders of Securities and the respective
successors and permitted assigns of each of them, so long as they hold
Securities. None of the provisions hereof shall create, or be construed or
deemed to create, any right to employment in favor of any Person by the
Corporation or any of its Subsidiaries. This Agreement is not intended to create
any third party beneficiaries.

     SECTION 25.  Counterparts.
                  ------------

          This Agreement may be executed simultaneously in two or more
counterparts, any one of which need not contain the signatures of more than one
party, but all such counterparts taken together will constitute one and the same
agreement.  It shall not be necessary in making proof of this Agreement to
produce or account for more than one such counterpart.

     SECTION 26.  Remedies.
                  --------

          (a)   Each Stockholder shall have all rights and remedies reserved for
     such Stockholder pursuant to this Agreement, the Subscription Agreement
     dated the Original Agreement Date, the Certificate and Bylaws and all
     rights and remedies which such holder has been granted at any time under
     any other agreement or contract and all of the rights which such holder has
     under any law or equity.  Any Person having any rights under any provision
     of this Agreement will be entitled to enforce such rights specifically, to
     recover damages by reason of any breach of any provision of this Agreement
     and to exercise all other rights granted by law or equity.

          (b)   The parties hereto agree that if any parties seek to resolve any
     dispute arising under this Agreement pursuant to a legal proceeding, the
     prevailing parties to such proceeding shall be entitled to receive
     reasonable fees and expenses (including reasonable attorneys' fees and
     expenses) incurred in connection with such proceedings.

          (c)   It is acknowledged that it will be impossible to measure in
     money the damages that would be suffered if the parties fail to comply with
     any of the obligations herein imposed on them and that in the event of any
     such failure, an aggrieved Person will be irreparably damaged and will not
     have an adequate remedy at law. Any such person shall, therefore, be
     entitled to injunctive relief, including specific performance, to enforce
     such obligations, and if any action should be brought in equity to enforce
     any of the provisions of this Agreement, none of the parties hereto shall
     raise the defense that there is an adequate remedy at law.

     SECTION 27.  Notices.
                  -------

          All notices, demands or other communications to be given or delivered
under or by reason of the provisions of this Agreement shall be in writing and
shall be deemed to have been given (a) when delivered personally to the
recipient, (b) one business day after being sent by reputable overnight courier
(charges prepaid) (regardless of whether the recipient refuses to accept
delivery), (c) five business days after being sent to the recipient by certified
or registered mail, return receipt requested and postage prepaid (regardless of
whether the recipient refuses to accept delivery) or (d) when sent to the
recipient by facsimile (followed promptly by personal, courier or certified or
registered mail delivery).  The Corporation's address is:

                                       37
<PAGE>

                  USS Holdings, Inc.
                  c/o D. George Harris & Associates, Inc.
                  399 Park Avenue
                  32nd Floor
                  New York, New York 10022

                  Telephone:  (212) 207-6400
                  Telecopier: (212) 207-6470
                  Attention: Donald G. Kilpatrick

          With a copy to:

                  Winthrop, Stimson, Putnam & Roberts
                  One Battery Park Plaza
                  New York, New York 10004

                  Telephone:  (212) 858-1000
                  Telecopier: (212) 858-1500
                  Attention:  Kenneth E. Adelsberg, Esq.

          The address for each Stockholder is set forth on Schedule 1 hereto;
and if to CMC, with a copy to:

                  O'Sullivan Graev & Karabell, LLP
                  30 Rockefeller Plaza
                  New York, New York 10112

                  Telephone:  (212) 408-2400
                  Telecopier: (212) 408-2420
                  Attention:  John J. Suydam, Esq.

     SECTION 28.  Governing Law.
                  -------------

          All questions concerning the construction, interpretation and validity
of this Agreement shall be governed by and construed in accordance with the
domestic laws of the State of New York without giving effect to any choice or
conflict of law provision or rule (whether in the State of New York or any other
jurisdiction) that would cause the application of the laws of any jurisdiction
other than the State of New York.

     SECTION 29.  Further Assurances.
                  ------------------

          Each party hereto shall do and perform or cause to be done and
performed all such further acts and things and shall execute and deliver all
such other agreements, certificates, instruments, and documents as any other
party hereto reasonably may request in order to carry out the provisions of this
Agreement and the consummation of the transactions contemplated hereby.

                                       38
<PAGE>

     SECTION 30.  Jurisdiction; Venue; Process.
                  ----------------------------

          The parties to this Agreement agree that jurisdiction and venue in any
action brought by any party hereto pursuant to this Agreement shall properly
(but not exclusively) lie in any federal or state court located in the State of
New York.  By execution and delivery of this Agreement, the parties hereto
irrevocably submit to the jurisdiction of such courts for himself and in respect
of his property with respect to such action.  The parties hereto irrevocably
agree that venue would be proper in such court, and hereby waive any objection
that such court is an improper or inconvenient forum for the resolution of such
action.  The parties further agree that the mailing by certified or registered
mail, return receipt requested, of any process required by any such court shall
constitute valid and lawful service of process against them, without necessity
for service by any other means provided by statute or rule of court.

     SECTION 31.  Representation and Warranties of the Stockholders.
                  -------------------------------------------------

          Each Stockholder (as to himself or itself only) represents and
warrants to the Corporation and the other Stockholders that, as of the time such
Stockholder becomes a party to this Agreement:

          (a)  this Agreement has been duly and validly executed and delivered
     by such Stockholder and this Agreement constitutes a legal and binding
     obligation of such Stockholder, enforceable against such Stockholder in
     accordance with its terms;

          (b)  the execution, delivery and performance by such Stockholder of
     this Agreement and the consummation by such Stockholder of the transactions
     contemplated hereby will not, with or without the giving of notice or lapse
     of time, or both (i) violate any provision of law, statute, rule or
     regulation to which the Stockholder is subject, (ii) violate any order,
     judgment or decree applicable to such Stockholder, or (iii) conflict with,
     or result in a breach or default under, any term or condition of any
     agreement or other instrument to which such Stockholder is a party or by
     which such Stockholder is bound, except for such violations, conflicts,
     breaches or defaults that would not, in the aggregate, materially affect
     the Stockholder's ability to perform its obligations hereunder;

          (c)  the Stockholder purchased the Securities owned by it for its own
     account, for investment and not with a view to the distribution thereof
     within the meaning of the Securities Act;

          (d)  the Stockholder understands that the Securities have not been
     registered under the Securities Act or registered or qualified under
     applicable state securities laws by reason of their issuance by the
     Corporation in a transaction exempt from the registration and qualification
     requirements of the Securities Act and applicable state securities laws,
     and (ii) the Securities must be held by the Stockholder indefinitely unless
     a subsequent disposition thereof is registered or qualified under the
     Securities Act and applicable state securities laws or is exempt from such
     registration or qualification.  The Stockholder understands that the
     certificates for the Securities will bear the legends described in Section
     19(b) and (e);

                                       39
<PAGE>

          (e)  the Stockholder further understands that, with respect to the
     Securities, the exemption from registration afforded by Rule 144 (the
     provisions of which are known to the Stockholder) depends on the
     satisfaction of various conditions, and that, if applicable, Rule 144 may
     only afford the basis for sales only in limited amounts;

          (f)  the Stockholder has not employed any broker or finder or similar
     person in connection with its purchase of the Securities;

          (g)  except as disclosed in writing to the Corporation prior to the
     acquisition of Securities by such Stockholder, the Stockholder is an
     "accredited investor" (as defined in Rule 501(a) of Regulation D
     promulgated under the Securities Act).  The Corporation has made available
     to the Stockholder or its representatives all agreements, documents,
     records and books that the Stockholder has requested relating to an
     investment in the Securities.  The Stockholder has had an opportunity to
     ask questions of, and receive answers from, Persons acting on behalf of the
     Corporation concerning the terms and conditions of this investment, and
     answers have been provided to all of such questions to the full
     satisfaction of the Stockholder.  No oral representations have been made or
     furnished to, or relied on by, the Stockholder or its representatives in
     connection with its investment in the Securities.  The Stockholder has such
     knowledge and experience in financial and business matters that it is
     capable of evaluating the risks and merits of its investment in the
     Securities;

          (h)  the Stockholder has no need for liquidity in its investment in
     the Securities and is able to bear the economic risk of its investment in
     the Securities and the complete loss of all of such investment;

          (i)  the Stockholder further understands that this Agreement is made
     with the Stockholder in reliance upon the Stockholder's representations to
     the Corporation contained in this Section 31; and

          (j)  the Stockholder and its representatives have conducted a due
     diligence investigation and have had the opportunity to review all
     documents and information which the Stockholder and its representatives
     have requested concerning Silica, the Corporation, the Subsidiaries and the
     Stockholder's investment.  In reaching its decision to invest in the
     Corporation, the Stockholder has relied on the foregoing investigation and
     information, on the representations and warranties in the Stock Purchase
     Agreement and on the representations and warranties set forth herein.

     SECTION 32.  Conflicting Agreements.
                  ----------------------

          No Stockholder shall enter into any stockholder agreements or
arrangements of any kind with any Person with respect to any Securities on terms
inconsistent with the provisions of this Agreement (whether or not such
agreements or arrangements are with other Stockholders or with Persons that are
not parties to this Agreement), including but not limited to, agreements or
arrangements with respect to the acquisition or disposition of Securities of the
Corporation in a manner which is inconsistent with this Agreement.

                                       40
<PAGE>

     SECTION 33.  Mutual Waiver of Jury Trial.
                  ---------------------------

          BECAUSE DISPUTES ARISING IN CONNECTION WITH COMPLEX FINANCIAL
TRANSACTIONS ARE MOST QUICKLY AND ECONOMICALLY RESOLVED BY AN EXPERIENCED AND
EXPERT PERSON AND THE PARTIES WISH APPLICABLE STATE AND FEDERAL LAWS TO APPLY
(RATHER THAN ARBITRATION RULES), THE PARTIES DESIRE THAT THEIR DISPUTES BE
RESOLVED BY A JUDGE APPLYING SUCH APPLICABLE LAWS.  THEREFORE, TO ACHIEVE THE
BEST COMBINATION OF THE BENEFITS OF THE JUDICIAL SYSTEM AND OF ARBITRATION, THE
PARTIES HERETO WAIVE ALL RIGHT TO TRIAL BY JURY IN ANY ACTION, SUIT OR
PROCEEDING BROUGHT TO ENFORCE OR DEFEND ANY RIGHTS OR REMEDIES UNDER THIS
AGREEMENT OR ANY DOCUMENTS RELATED HERETO.

                               *   *   *   *   *

                                       41
<PAGE>

          IN WITNESS WHEREOF, the undersigned have duly executed this Amendment
No. 2 as of the date first written above.

                              USS HOLDINGS, INC.

                              By: /s/ Donald G. Kilpatrick
                                  ----------------------------------
                                  Name:
                                  Title:

                              CHASE MANHATTAN CAPITAL, L.P.
                              By: Chase Manhattan Capital Corporation,
                                  its general partner

                                   By: /s/ Arnold L. Chavkin
                                       -----------------------------
                                       Name:  Arnold L. Chavkin
                                       Title: General Partner

                              CHASE VENTURE CAPITAL
                              ASSOCIATES, L.P.
                              By: Chase Capital Partners,
                                  its general partner

                                   By: /s/ Arnold L. Chavkin
                                       -----------------------------
                                       Name: Arnold L. Chavkin
                                       Title: General Partner

                              MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY

                              By: __________________________________
                                  Name:
                                  Title:

                                       42
<PAGE>

                              MASSMUTUAL PARTICIPATION INVESTORS

                              By: __________________________________
                                  Name:
                                  Title:

                              MASSMUTUAL CORPORATE INVESTORS

                              By: __________________________________
                                  Name:
                                  Title:

                              GERLACH & CO.

                              By: __________________________________
                                  Name:
                                  Title:

                              /s/ D. George Harris
                              --------------------------------------
                              D. George Harris

                              /s/ Anthony J. Petrocelli
                              --------------------------------------
                              Anthony J. Petrocelli

                              /s/ Richard J. Donahue
                              --------------------------------------
                              Richard J. Donahue

                              /s/ Donald G. Kilpatrick
                              --------------------------------------
                              Donald G. Kilpatrick

                              ______________________________________
                              David Willetts

                              /s/ Richard J. Nick
                              --------------------------------------
                              Richard J. Nick

                                       43
<PAGE>

                              ______________________________________
                              William J. Sichko

                              ______________________________________
                              Emanuel J. Di Teresi

                              ______________________________________
                              Matthew J. Dowd

                              ______________________________________
                              Michael R. Boyce

                              ______________________________________
                              Peter McConnell

                              ______________________________________
                              Robert F. Clark

                              ______________________________________
                              Keith Clark

                              ______________________________________
                              Susan E. Day

                              ______________________________________
                              Daniel Richardson

                              ______________________________________
                              Billy Whalen

                              ______________________________________
                              Max Reynolds

                              ______________________________________
                              Scott Randolph

                              ______________________________________
                              Lawrence A. Schulte, Jr.

                                       44
<PAGE>

                                     ___________________________________________
                                     Kevin F.X. Brophy

                                     ___________________________________________
                                     Gerard A. Gasparovich

                                     ___________________________________________
                                     Gordon L. Rulong

                                     ___________________________________________
                                     Jeffrey P. Jahn

                                     ___________________________________________
                                     Richard Hunnisett

                                     ___________________________________________
                                     Patrick W. Reeser

                                     ___________________________________________
                                     Beverly G. Sykes, Jr.

                                     ___________________________________________
                                     Jeffrey D. Thatcher

                                     ___________________________________________
                                     Earle H. Andrews

                                     ___________________________________________
                                     Gregory S. Fell

                                     ___________________________________________
                                     Teddy D. Glennon

                                     ___________________________________________
                                     Robert Mang

                                     ___________________________________________
                                     Andrew L. Meyers

                                       45
<PAGE>

                                     ___________________________________________
                                     James W. Holmes

                                     ___________________________________________
                                     John W. Hammer

                                     ___________________________________________
                                     Gilberto Lopez

                                     ___________________________________________
                                     Larry D. Martin

                                     ___________________________________________
                                     Stephen L. Yeich

                                     ___________________________________________
                                     Mack D. Jones

                                     ___________________________________________
                                     Donald P. Altand

                                     ___________________________________________
                                     Roque A. Pullio

                                     ___________________________________________
                                     M. Ben Bushe

                                     ___________________________________________
                                     George H. Didawick

                                     ___________________________________________
                                     James A. Wagner

                                     ___________________________________________
                                     Mark V. Lough

                                     ___________________________________________
                                     Gary A. Randolph

                                       46
<PAGE>

                                     ___________________________________________
                                     Jon P. Sheridan

                                     ___________________________________________
                                     Matthew J. Lyman

                                     ___________________________________________
                                     Ronnie D. Conway

                                     ___________________________________________
                                     James S. Vaccari

                                     ___________________________________________
                                     Raymond A. LeClair

                                     ___________________________________________
                                     Robert L. Krepps

                                     ___________________________________________
                                     Dale M. McFadden

                                     ___________________________________________
                                     William A. White

                                     ___________________________________________
                                     Randall J. Massino

                                     ___________________________________________
                                     David O. Bach

                                     ___________________________________________
                                     Cyrus W. Kreamer, Jr.

                                     ___________________________________________
                                     Steven J. Babler

                                     ___________________________________________
                                     Kimberly A. Ranft

                                       47
<PAGE>

                                     ___________________________________________
                                     David R. Whitmarsh

                                     ___________________________________________
                                     John E. Friton

                                     ___________________________________________
                                     Eric K. Yildrim

                                     ___________________________________________
                                     Les Van Alstyne, Jr.

                                     ___________________________________________
                                     William L. Foutch

                                     ___________________________________________
                                     Janice M. Widmeyer

                                     ___________________________________________
                                     John H. Wilson

                                     ___________________________________________
                                     Clive M. Kelsall

                                     ___________________________________________
                                     H. William Bentgen

                                     ___________________________________________
                                     Robert L. Oren

                                     ___________________________________________
                                     John L. Mason

                                     ___________________________________________
                                     Harvey S. Goldstein

                                     ___________________________________________
                                     Larry A. Burkhart

                                       48
<PAGE>

                                     ___________________________________________
                                     Richard E. Goodell

                                     ___________________________________________
                                     Gary E. Bockrath

                                     ___________________________________________
                                     Robert B. Calamari

                                     ___________________________________________
                                     Walter C. Pellish

                                     ___________________________________________
                                     John A. Ulizio

                                     ___________________________________________
                                     James D. Walker

                                     ___________________________________________
                                     Daniel N. Gerber

                                     ___________________________________________
                                     Robert H. Morrow

                                     ___________________________________________
                                     Paul F. Guttmann

                                     ___________________________________________
                                     Jerry D. Austin

                                     ___________________________________________
                                     David A. Kistenfeger

                                     ___________________________________________
                                     John F. Miller

                                     ___________________________________________
                                     Lance D. Reed

                                       49
<PAGE>

                                     ___________________________________________
                                     James A. Sinkowski

                                     ___________________________________________
                                     Troy L. Trentham

                                     ___________________________________________
                                     Ray K. Weiland

                                     ___________________________________________
                                     William P. Weiland

                                     ___________________________________________
                                     Michael L. Thompson

                                     ___________________________________________
                                     Richard J. Shearer

                                     Trust under Agreement of D. George Harris
                                     dated November 18, 1994
                                     F/B/O Robert Harris

                                     By /s/ Anthony J. Petrocelli
                                        ----------------------------------------
                                        Anthony J. Petrocelli, Trustee

                                     By /s/ Donald G. Kilpatrick
                                        ----------------------------------------
                                        Donald G. Kilpatrick, Trustee

                                     Trust under Agreement of D. George Harris
                                     dated November 18, 1994
                                     F/B/O Margaret Harris

                                     By /s/ Anthony J. Petrocelli
                                        ----------------------------------------
                                        Anthony J. Petrocelli, Trustee

                                     By /s/ Donald G. Kilpatrick
                                        ----------------------------------------
                                        Donald G. Kilpatrick, Trustee

                                       50
<PAGE>

                                     Trust under Agreement of D. George Harris
                                     dated November 18, 1994
                                     F/B/O Paige Coleman

                                     By /s/ Anthony J. Petrocelli
                                        ----------------------------------------
                                        Anthony J. Petrocelli, Trustee

                                     By /s/ Donald G. Kilpatrick
                                        ----------------------------------------
                                        Donald G. Kilpatrick, Trustee

                                     Trust under Agreement of D. George Harris
                                     dated November 18, 1994
                                     F/B/O Keith Coleman

                                     By /s/ Anthony J. Petrocelli
                                        ----------------------------------------
                                        Anthony J. Petrocelli, Trustee

                                     By /s/ Donald G. Kilpatrick
                                        ----------------------------------------
                                        Donald G. Kilpatrick, Trustee

                                     Trust under Agreement of D. George Harris
                                     dated November 18, 1994
                                     F/B/O Augustus Northridge

                                     By /s/ Anthony J. Petrocelli
                                        ----------------------------------------
                                        Anthony J. Petrocelli, Trustee

                                     By /s/ Donald G. Kilpatrick
                                        ----------------------------------------
                                        Donald G. Kilpatrick, Trustee

                                       51
<PAGE>

                                     Trust under Agreement of D. George Harris
                                     dated January 31, 1995
                                     F/B/O P.G.F. Scurr

                                     By /s/ Anthony J. Petrocelli
                                        ----------------------------------------
                                        Anthony J. Petrocelli, Trustee

                                     By /s/ Donald G. Kilpatrick
                                        ----------------------------------------
                                        Donald G. Kilpatrick, Trustee

                                     Trust under Agreement of Anthony J.
                                     Petrocelli dated October 29, 1990

                                     By /s/ D. George Harris
                                        ----------------------------------------
                                        D. George Harris, Trustee

                                     By ________________________________________
                                        Charles J. Cassata, Trustee

                                     Trust under Agreement of Donald G.
                                     Kilpatrick dated December 16, 1993
                                     F/B/O Daniel G. Kilpatrick

                                     By /s/ Donald G. Kilpatrick
                                        ----------------------------------------
                                        Donald G. Kilpatrick, Trustee

                                     By /s/ Anthony J. Petrocelli
                                        ----------------------------------------
                                        Anthony J. Petrocelli, Trustee

                                       52
<PAGE>

                                 Trust under Agreement of Donald G. Kilpatrick
                                 dated December 16, 1993
                                 F/B/O Eleanor P. Kilpatrick

                                 By /s/ Donald G. Kilpatrick
                                    ----------------------------------------
                                    Donald G. Kilpatrick, Trustee

                                 By /s/ Anthony J. Petrocelli
                                    ----------------------------------------
                                    Anthony J. Petrocelli, Trustee

                                 Trust under Agreement of Donald G. Kilpatrick
                                 dated December 16, 1993
                                 F/B/O Jennifer C. Kilpatrick

                                 By /s/ Donald G. Kilpatrick
                                    ----------------------------------------
                                    Donald G. Kilpatrick, Trustee

                                 By /s/ Anthony J. Petrocelli
                                    ----------------------------------------
                                    Anthony J. Petrocelli, Trustee

                                 Trust under Agreement of Donald G. Kilpatrick
                                 dated December 16, 1993
                                 F/B/O Donald A. Kilpatrick

                                 By /s/ Donald G. Kilpatrick
                                    ----------------------------------------
                                    Donald G. Kilpatrick, Trustee

                                 By /s/ Anthony J. Petrocelli
                                    ----------------------------------------
                                    Anthony J. Petrocelli, Trustee

                                       53
<PAGE>

                                  Schedule 1

<TABLE>
<S>                                          <C>                                          <C>
Chase Manhattan Capital, L.P.                Chase Venture Capital                        Massachusetts Mutual Life
c/o Chase Manhattan Capital                  Associates, L.P.                             Insurance Company
Corporation                                  c/o Chase Capital Partners                   c/o Mr. Mark Ahmed
380 Madison Avenue, 12th Floor               380 Madison Avenue, 12th Floor               Managing Director
New York, NY 10017                           New York, NY 10017                           Securities Investment Division
                                                                                          Mass Mutual
                                                                                          1295 State Street
                                                                                          Springfield, MA 01111-0001

MassMutual Participation                     Mass Mutual Corporate Investors              D. George Harris
Investors                                    c/o Mr. Mark Ahmed                           D. George Harris & Associates, Inc.
c/o Mr. Mark Ahmed                           Managing Director                            399 Park Avenue, 32nd floor
Managing Director                            Securities Investment Division               New York, NY 10022
Securities Investment Division               Mass Mutual
Mass Mutual                                  1295 State Street
1295 State Street                            Springfield, MA 01111-0001
Springfield, MA 01111-0001

Anthony J. Petrocelli                        Richard J. Donahue                           Donald G. Kilpatrick
D. George Harris & Associates, Inc.          D. George Harris & Associates, Inc.          D. George Harris & Associates, Inc.
399 Park Avenue, 32nd floor                  399 Park Avenue, 32nd floor                  399 Park Avenue, 32nd floor
New York, NY 10022                           New York, NY 10022                           New York, NY 10022

Richard J. Nick                              William J. Sichko                            Emanual J. DiTeresi
D. George Harris & Associates, Inc.          9204 West 141st Street                       13905 Flint
399 Park Avenue, 32nd floor                  Overland Park, KS 66221                      Overland Park, KS 66221
New York, NY 10022

Matthew J. Dowd                              David Willetts                               Robert F. Clark
D. George Harris & Associates, Inc.          1 Eldon Road                                 12740 Delmar Dr.
399 Park Avenue, 32nd floor                  Kensington                                   Leawood, KS 66209
New York, NY 10022                           London W8 5PU
                                             United Kingdom

Keith E. Clark                               Susan E. Dey                                 Daniel E. Richardson
9201 West 146th Pl.                          9604 W. 125th St.                            11621 Bluejacket
Overland Park, KS 66221                      Overland Park, KS 66213                      Overland Park, KS 66210

Billy Whalen                                 Max J. Reynolds                              Scott M. Randolph
13181 Hayes Ct.                              2147 West 5025 South                         14763 Eby
Overland Park, KS 66223                      Roy, UT 84067                                Overland Park, KS 66221
</TABLE>
<PAGE>

<TABLE>
<S>                                           <C>                                        <C>
Kevin Brophy                                  Laurence A. Schulte                        Peter McConnell
399 South Pleasant Ave                        8114 West 139th St.                        38 Avenue Close
Ridgewood, NY 07450                           Overland Park, KS 66223                    St. John's Wood
                                                                                         London, NW8 6-A
                                                                                         United Kingdom

Gerald A. Gasparovich                         Michael R. Boyce                           Trust under Agreement of D. George
13004 West 128th Place                        10600 Highland Lane                        Harris dated November 18, 1994
Overland Park, KS 66213                       Olathe, KS 66061                           F/B/O Robert Harris
                                                                                         c/o D. George Harris & Associates, Inc.
                                                                                         399 Park Avenue, 32nd floor
                                                                                         New York, NY 10022

Trust under Agreement of D. George            Trust under Agreement of D. George         Trust under Agreement of D. George
Harris dated November 18, 1994                Harris dated November 18, 1994             Harris dated November 18, 1994
F/B/O Margaret Harris                         F/B/O Paige Coleman                        F/B/O Keith Coleman
c/o D. George Harris & Associates, Inc.       c/o D. George Harris & Associates, Inc.    c/o D. George Harris & Associates, Inc.
399 Park Avenue, 32nd floor                   399 Park Avenue, 32nd floor                399 Park Avenue, 32nd floor
New York, NY 10022                            New York, NY 10022                         New York, NY 10022

Trust under Agreement of D. George            Trust under Agreement of D. George         Trust under Agreement of Anthony
Harris dated November 18, 1994                Harris dated January 31, 1995              J. Petrocelli dated October 29, 1990
F/B/O Augustus Northridge                     F/B/O P.G.F. Scurr                         c/o D. George Harris & Associates, Inc.
c/o D. George Harris & Associates, Inc.       c/o D. George Harris & Associates, Inc.    399 Park Avenue, 32nd floor
399 Park Avenue, 32nd floor                   399 Park Avenue, 32nd floor                New York, NY 10022
New York, NY 10022                            New York, NY 10022

Trust under Agreement of Donald G.            Trust under Agreement Donald G.            Trust under Agreement of Donald G.
Kilpatrick dated December 16, 1993            Kilpatrick dated December 16, 1993         Kilpatrick dated December 16, 1993
F/B/O Daniel J. Kilpatrick                    F/B/O Eleanor P. Kilpatrick                F/B/O Jennifer C. Kilpatrick
c/o D. George Harris & Associates, Inc.       c/o D. George Harris & Associates, Inc.    c/o D. George Harris & Associates, Inc.
399 Park Avenue, 32nd floor                   399 Park Avenue, 32nd floor                399 Park Avenue, 32nd floor
New York, NY 10022                            New York, NY 10022                         New York, NY 10022

Trust under Agreement of Donald G.
Kilpatrick dated December 16, 1993
F/B/O Douglas A. Kilpatrick
c/o D. George Harris & Associates, Inc.
399 Park Avenue, 32nd floor
New York, NY 10022

Donald P. Altland                             Earle H. Andrews                           Jerry D. Austin
705 Cherry Drive                              15929 Short Hill Road                      1433 Hamilton Blvd.
Groesbeck, TX 76642                           Purcellville, VA 20132                     Hagerstown, MD 21742
</TABLE>

                                       2
<PAGE>

<TABLE>
<S>                                     <C>                                   <C>
Steven J. Babler                        David O. Bach                         H. William Bentgen
93 Hickory Hill                         3555 East 5Th Road                    249 Fairway Circle
Eureka, MO 63025                        Lasalle, IL 61301                     Cross Junction, VA 22624

Gary E. Bockrath                        Larry A. Burkhart                     M. Ben Bushe
11411 Eastwood Court                    402 S. Illinois Avenue                204 Man O'War
Hagerstown, MD 21742                    Martinsburg, WV 25401                 Groesbeck, TX 76642

Robert B. Calamari                      Ronnie D. Conway                      George H. Didawick
1031 Breckinridge Lane                  10920 Forest Trace Lane               P. O. Box 615
Winchester, VA 22601                    Glen Allen, VA 23060                  Berkeley Springs, WV 25411

William P. Farrell                      Gregory S. Fell                       William L. Foutch
111 Winterberry Court                   2004 Maplewood Drive                  18710 Fairfield Road
Winchester, VA 22602                    Hagerstown, MD 21740                  Hagerstown, MD 21742John

John E. Friton                          Daniel N. Gerber                      Teddy D. Glennon
13003 Lance Circle                      2143 Castlegreen Drive                Route 4, Box 93
Hagerstown, MD 21742                    Greencastle, PA 17225                 Hedgesville, WV 25427-9316

Harvey S. Goldstein                     Richard E. Goodell                    Paul F. Guttmann
505 Victoria Lane                       Route 5, Box 250                      Route 1, Box 246B
Oswego, IL 60543                        Hedgesville, WV 25427                 Hedgesville, WV 25427

John W. Hammer                          James W. Holmes                       Richard Hunnisett
231 Jacques Haven Road                  217 Green Acre Circle                 14103 Barnhart Road
Gaston, SC 29053                        Lexington, SC 29073                   Clear Spring, MD 21722

Jeffrey P. Jahn                         Mack D. Jones                         Clive M. Kelsall
1026 Lakeview Drive                     Route 3, Box 53                       10241 Orleans Road NE
Cross Junction, VA 22625                Thornton, TX 76687                    Little Orleans, MD 21766

David A. Kistenfeger                    Cyrus W. Kreamer, Jr.                 Robert L. Krepps
1619 Dairy Lane                         Rt#l 6 Kilkenny Hill                  15 Countryside Avenue
Ottawa, IL 61350                        Pacific, MO 63069                     Ottawa, IL 61350

Raymond A. LeClair                      Gilberto Lopez                        Mark V. Lough
112 1/2 West Superior Street            307 Grantham Road                     26 N. Ladow Avenue, Apt. 19D
Ottawa, IL 61350                        Irmo, SC 29063                        Millville, NJ 08332

Matthew J. Lyman                        Robert Mang                           Larry D. Martin
155 Ashland Drive                       49 Seely Pine Estates                 173 Jefferson Place
Winchester, VA 22603                    Berkeley Springs, WV 25411            Columbia, SC 29212
</TABLE>

                                       3
<PAGE>

<TABLE>
<S>                                          <C>                                          <C>
John L. Mason                                Randall J. Massino                           Dale M. McFadden
400 Mawani Trail                             1029 E. Court Street                         708 W. Madison
Berkeley Springs, WV 25411                   Hennepin, IL 61327                           Ottawa, IL 61350

Andrew L. Meyers                             John F. Miller                               Robert H. Morrow
5 Amblers Lane                               11905 Sycamore Drive                         Route 1, Box 242 Honeywood
Shenandoah Junction, WV 25442                Hagerstown, MD 21740                         Hedgesville, WV 25427

Robert L. Oren                               Walter C. Pellish                            Roque A. Pullio
Rt. 3, Box 5622                              1501 W. Stephen Street                       802 E. Yeagua
Berryville, VA 22611                         Martinsburg, WV 25401                        Groesbeck, TX 76642

Gary A. Randolph                             Kimberly A. Ranft                            Lance D. Reed
1201 Willow Lane                             434 Alverston Court                          8235 South Oswego
Sulphur, OK 73086                            Ballwin, MO 63021                            Tulsa, OK 74137

Patrick W. Reeser                            Gordon L. Rulong                             Jon P. Sheridan
Route 1, Box 245 O                           18901 Dover Drive                            1901 Marsh Lane
Hedgesville, WV 25427                        Hagerstown, MD 21742                         Ardmore, OK 73401

James A. Sinkowski                           Beverly G. Sykes, Jr.                        Jeffrey D. Thatcher
53 Westwood Drive                            Route 7, Box 12850                           Route 2, Box 156
Groton, CT 06340                             Berkeley Springs, WV 25411                   Berkeley Springs, WV 25411

Michael L. Thompson                          Troy L. Trentham                             John A. Ulizio
177 Greenfield Drive                         5211 Powers Ferry Road                       19223 Old Ipswich Circle
Winchester, VA 22603                         Atlanta, GA 30327                            Hagerstown, MD 21742

James S. Vaccari                             Les Van Alstyne, Jr.                         James A. Wagner
2245 Delaney Drive                           Rd 1, Box 6                                  2218 Shamrock Lane
Ottawa, IL 61350                             Huntingdon, PA 16652                         Millville, NJ 08332

James D. Walker                              Ray K. Weiland                               William A. White
2002 Springdale Drive                        714 Camelot Estates Drive                    2111 Showers Lane
Martinsburg, WV 25401                        Hillsboro, MO 63050                          Martinsburg, WV 25401

David R. Whitmarsh                           Janice M. Widmyer                            John H. Wilson
3475 Geiger Road                             75 Michael Manor Rd.                         135 10 Paradise Church Road
Ida, MI 48140                                Berkeley Springs, W 25411                    Hagerstown, NM 21742

Stephen L. Yeich                             Eric K. Yildrim                              Richard J. Shearer
263 Hyatt                                    13316 Keener Road                            Route 4, Box 8930
Ruston, LA 71270                             Hagerstown, MD 21742                         Berkeley Springs, WV 25411
</TABLE>

                                       4
<PAGE>

                                  Schedule 2

     Accounting Period                            Budgeted EBITDA
     -----------------                            ---------------
     Fiscal Year Ending December 31, 1998         $31,715
     Fiscal Year Ending December 31, 1999         $36,695
     Fiscal Year Ending December 31, 2000         $40,642
     Fiscal Year Ending December 31, 2001         $43,130
     Fiscal Year Ending December 31, 2002         $45,400
<PAGE>

                                  Schedule 3

                        [Form of Restated Certificate]
<PAGE>

                                  Schedule 4

                               DGHA Stockholders

D. George Harris

Anthony J. Petrocelli

Richard J. Donahue

Donald G. Kilpatrick

Richard J. Nick
<PAGE>

                                  Schedule 5

                          Non-Affiliated Stockholders

Michael R. Boyce

Peter McConnell

Robert F. Clark

Keith Clark

Susan E. Day

Daniel Richardson

Billy Whalen

Max Reynolds

Scott Randolph

Kevin F. X. Brophy

Lawrence A. Schulte, Jr.

Gerald A. Gasparovich

William J. Sichko

Emanuel J. DiTeresi

Matthew J. Dowd

David Willetts
<PAGE>

                                  Schedule 6

                          Institutional Stockholders

Chase Manhattan Capital, L.P.

Chase Venture Capital Associates, L.P.

Massachusetts Mutual Life Insurance Company

Massmutual Participation Investors

Massmutual Corporate Investors

Gerlach & Co.
<PAGE>

                                  Schedule 7

                     Form of Manager Repurchase Agreement
<PAGE>

                                  Schedule 8

                             Manager Stockholders
          Donald P. Altland                  Larry D. Martin
          Earle H. Andrews                   John L. Mason
          Jerry D. Ausin                     Randall J. Massino
          Steven J. Babler                   Dale M. McFadden
          David O. Bach                      Andrew L. Meyers
          H. William Bentgen                 John F. Miller
          Gary E. Bockrath                   Robert H. Morrow
          Larry A. Burkhart                  Robert L. Oren
          M. Ben Bushe                       Walter C. Pellish
          Robert B. Calamari                 Roque A. Pullio
          Ronnie D. Conway                   Gary A. Randolph
          George H. Didawick                 Kimberly A. Ranft
          William P. Farrell                 Lance D. Reed
          Gregory S. Fell                    Patrick W. Reeser
          William L. Foutch                  Gordon L. Rulong
          John E. Friton                     Richard J. Shearer
          Daniel N. Gerber                   Jon P. Sheridan
          Teddy D. Glennon                   James A. Sinkowski
          Harvey S. Goldstein                Beverly G. Sykes, Jr.
          Richard E. Goodell                 Jeffrey D. Thatcher
          Paul F. Guttmann                   Michael L. Thompson
          John W. Hammer                     Troy L. Trentham
          James W. Holmes                    John A. Ulizio
          Richard Hunnisett                  James S. Vaccari
          Jeffrey P. Jahn                    Les Van Alstyne, Jr.
          Mack D. Jones                      James A. Wagner
          Clive M. Kelsall                   James D. Walker
          David A. Kistenfeger               Ray K. Weiland
          Cyrus W. Kreamer, Jr.              William A. White
          Robert L. Krepps                   David R. Whitmarsh
          Raymond A. LeClair                 Janice M. Widmyer
          Gilberto Lopez                     John H. Wilson
          Mark V. Lough                      Stephen L. Yeich
          Matthew J. Lyman                   Eric K. Yildrim
          Robert Mang<PAGE>

                                                                    EXHIBIT 10.2

     AMENDED AND RESTATED MANAGEMENT SERVICES AGREEMENT (the "Agreement") dated
as of October 1, 1998, among USS HOLDINGS, INC., a Delaware corporation
("USSH"), USS INTERMEDIATE HOLDCO, INC., a Delaware corporation ("USSIH"), U.S.
SILICA COMPANY, a Delaware corporation ("Silica") (collectively, the
"Companies", and individually a "Company"), and D. GEORGE HARRIS & ASSOCIATES,
INC., a Delaware corporation ("DGHA").

     WHEREAS, USSH, USSIH, USS Acquisition, Inc., a Delaware corporation
("USSA") and DGHA have entered into a Management Services Agreement dated as of
February 9, 1996 (the "Old Agreement");

     WHEREAS, USSA was merged with and into Silica on February 9, 1996.

     WHEREAS, each Company desires to continue to avail itself of DGHA's
expertise and consequently has requested DGHA to continue to provide such
expertise, from time to time, in rendering certain management services related
to the business and affairs of such Company and its Subsidiaries and the review
and analysis of certain financial and other transactions.

     WHEREAS, DGHA and the Companies agree that it is in their respective
interests to enter into this Agreement whereby, for the consideration specified
herein, DGHA shall provide such services to the Companies.

     WHEREAS, each Company and DGHA wish to amend in certain respects and
restate the Old Agreement;

     NOW, THEREFORE, in consideration of the mutual covenants hereinafter set
forth, the Companies and DGHA agree as follows:

     Section 1.  Definitions.
                 -----------

            (a)  Unless defined herein, capitalized terms used in this Agreement
shall have the meanings ascribed to them in the Amended and Restated
Stockholders Agreement dated as of the date hereof, as amended from time to time
(the "Stockholders Agreement"), among USSH and the Stockholders.

            (b)  The following capitalized terms used in this Agreement have the
meanings ascribed to them below:

     "Actual EBITDA" shall be calculated at the end of each fiscal year,
      -------------
beginning with the fiscal year ending December 31, 1998, and shall mean the
EBITDA of the Company for the twelve-month period ended on the last day of each
fiscal year.

     "Budgeted EBITDA" shall be calculated at the end of each fiscal year,
      ---------------
beginning with the fiscal year ending December 31, 1998, and shall mean for each
fiscal year the EBITDA set forth opposite such fiscal year on Exhibit A.
<PAGE>

     "EBITDA" shall have the meaning ascribed to it in the Credit Agreement
      ------
dated as of July 21, 1998, as amended from time to time, among Silica and the
Lenders party thereto.

     "New Acquisition" means the acquisition of a business as a going concern,
      ---------------
whether by asset acquisition, acquisition of capital stock or merger.

          (c)    The use in this Agreement of the term "including" means
"including, without limitation." The words "herein," "hereof," "hereunder" and
other words of similar import refer to this Agreement as a whole, including the
schedules and exhibits, as the same may from time to time be amended or
supplemented, and not to any particular section, subsection, paragraph,
subparagraph or clause contained in this Agreement.  All references to sections,
schedules and exhibits mean the sections of this Agreement and the schedules and
exhibits attached to this Agreement.

          (d)    The title of and the section and paragraph headings in this
Agreement are for convenience of reference only and shall not govern the
interpretation of any of the terms or provisions of this Agreement.

          (e)    The use herein of the masculine, feminine or neuter forms shall
also denote the other forms, as in each case the context may require.

   Section 2.    Retention of DGHA.
                 -----------------

     The Companies retain DGHA, and DGHA accepts such retention, upon the terms
and conditions set forth in this Agreement.

   Section 3.    Term.
                 ----

          (a) Subject to the provisions of Section 3(b), this Agreement shall
commence on the date hereof and shall terminate on December 31, 2000 (the
"Initial Term"); provided that upon the termination of the Initial Term this
Agreement shall be automatically extended until terminated by USSH or DGHA by
serving 9 months prior written notice upon the other..

          (b) This Agreement shall automatically terminate with respect to (i)
any Company and its Subsidiaries upon a sale of such Company to a person which
is not an Affiliate of such Company (whether pursuant to a merger or
consolidation, a sale of capital stock or all or substantially all of its
assets) and (ii) all of the Companies in the event that (A) the Majority of the
Institutional Stockholders have designated the Additional Institutional
Directors pursuant to Section 2(b) of the Stockholders Agreement and USSH has
provided written notice to DGHA of its desire to terminate this Agreement
pursuant to this clause (ii)(A) of Section 3(b) or (B) the DGHA Stockholders and
their respective  Affiliates cease to own 50% or more of the Securities (other
than the DGHA Restricted Shares) held by them on the date hereof.

          (c) This Agreement may be terminated at the option of USSH if neither
D. George Harris nor Anthony J. Petrocelli is actively involved in the
management of DGHA.

                                       2
<PAGE>

   Section 4.  Management Services.
               -------------------

          (a) DGHA shall advise the Companies concerning such management matters
as relate to proposed financial transactions, acquisitions and other senior
management matters related to the Companies' business, administration and
policies, in each case as the Companies shall reasonably and specifically
request by way of notice to DGHA, which notice shall specify the services
required of DGHA and shall include all background material necessary for DGHA to
complete such services.  DGHA shall not be required to devote any specified
amount of time to any such written request and shall be required to devote only
so much time to any such written request as DGHA shall, in its reasonable
discretion, deem necessary to complete such services.  Such consulting services
shall, in DGHA's reasonable discretion, be rendered in person or by telephone or
other communication.  DGHA shall (i) use its reasonable efforts to deal
effectively with all subjects submitted to it hereunder and (ii) endeavor to
further, by performance of its services hereunder, the policies and objectives
of the Companies.

          (b) DGHA shall perform all such services as an independent contractor
to the Companies.  DGHA is not an employee, agent or representative of any
Company and has no authority to act for or to bind any Company without its prior
written consent.

          (c) This Agreement shall in no way prohibit DGHA or any partner or
employee thereof from engaging in other activities, whether or not competitive
with any business of the Companies.

   Section 5.  Compensation.
               ------------

          (a) As consideration for DGHA's agreement to render the management
services set forth in Section 4 and as compensation for any such services
rendered by DGHA, the Companies shall pay DGHA (or one or more designees
thereof) an annual fee (the "Annual Fee") of $500,000, which shall be subject to
the adjustments set out in Sections 5(c) and (d).

          (b) The Annual Fee shall be paid for each fiscal year in equal monthly
installments, payable in arrears.

          (c) Promptly after receipt by the Compensation Committee of the annual
audited financial statements of the Companies for the preceding fiscal year, the
Companies shall pay DGHA, or, if the result of the following calculation is a
negative number, DGHA shall pay the Companies, an amount equal to the absolute
value of:  (i) the aggregate amount of compensation to be paid by the Companies
to DGHA with respect to the preceding fiscal year as determined in accordance
with Exhibit B based on the Actual EBITDA for such fiscal year compared to the
Budgeted EBITDA for such fiscal year minus (ii) the aggregate amount of
compensation actually paid by the Companies to DGHA with respect to the
preceding fiscal year.

     Notwithstanding the foregoing, (x) subject to the following clause (y), any
amount payable by DGHA to the Companies pursuant to Section 5(c) shall be paid
by deducting such amount, in equal monthly installments through the end of the
year in which any such amount is determined to be payable by DGHA, from the
monthly installments payable by the Companies to

                                       3
<PAGE>

DGHA pursuant to Section 5(b), and (y) for any fiscal year during which this
Agreement is terminated (and not renewed) pursuant to the terms hereof, (i) the
Budgeted EBITDA for such fiscal year shall be prorated from the end of the
immediately preceding fiscal year through the date of termination, (ii) all
amounts otherwise payable as provided above shall be prorated from the end of
the immediately preceding fiscal year through the date of termination and (iii)
any amount payable by the Companies to DGHA or by DGHA to the Companies, as the
case may be, pursuant to Section 5(c) shall be paid by the Companies or DGHA, as
the case may be, notwithstanding any such termination, promptly after the
financial statements of the Companies for the period from the end of the
immediately preceding fiscal year through the date of termination become
available. The Companies shall promptly prepare and make available such
financial statements.

          (d) In the event of (i) any New Acquisition which is approved by the
Requisite Stockholders pursuant to the Stockholders Agreement, this Agreement
shall automatically be amended to increase the levels of aggregate compensation
provided in Exhibit B hereto in such proportions as are necessary to reflect the
increase resulting from such acquisition in the Budgeted EBITDA provided in
Exhibit A hereto (as similarly adjusted), as such increase in the Budgeted
EBITDA was submitted to the Requisite Stockholders in connection with the
approval of such acquisition and (ii) any disposition by the Companies of the
stock or assets of any Company or any Subsidiary thereof, this Agreement shall
automatically be amended to decrease the levels of aggregate compensation
provided in Exhibit B hereto in such proportions as are necessary to reflect the
decrease (based upon the average annual EBITDA contribution of the disposed
assets for the last 12 fiscal quarters immediately preceding such disposition)
resulting from such disposition in the Budgeted EBITDA provided in Exhibit A
hereto (as similarly adjusted).

          (e) All accounting determinations under this Agreement will be made in
accordance with generally accepted accounting principles, consistently applied,
as reasonably approved by the Compensation Committee.  In the event of any
dispute between the parties relating to any accounting determination or
calculation hereunder, such dispute will be resolved by the Companies'
independent accountants, whose written determination shall be final and binding
on the parties hereto.

          (f) The Companies shall reimburse DGHA for all reasonable out-of-
pocket travel and entertainment expenses incurred by DGHA in connection with the
rendering of management services pursuant to this Agreement, provided that in
any one year no more than $100,000 of such expenses not charged against a
completed transaction shall be reimbursed.

   Section 6.  Loans.
               -----

          (a) At the request of DGHA, Silica shall provide to DGHA one or more
interest-free loans of not more than $1 million in the aggregate per calendar
year, throughout the term of this Agreement (the "Loans").

          (b) The Loans shall mature and be payable as of the date of the
consummation of an IRR Event.

                                       4
<PAGE>

          (c) The Loans shall be guaranteed by the persons listed on Schedule 1
attached hereto (the "Guarantors") and in proportion with the percentages listed
opposite such Guarantors' names on Schedule 1, which guarantees shall be several
but not joint obligations of the Guarantor.  A form of such guarantees is
attached hereto as Exhibit C.

     Section 7.  Acquisition Fee.
                 ---------------

     Within 30 days after the closing of any New Acquisition, USSH shall pay to
DGHA an acquisition fee equal to 1% (one percent) of the total purchase price,
plus all third party indebtedness for borrowed money assumed by any Company or
any Subsidiary of any Company, paid or payable, or otherwise to be distributed,
directly or indirectly, by any Company or any Subsidiary of any Company in
connection with such New Acquisition.

     Section 8.  Notices.
                 -------

     All notices, requests, consents and other communications hereunder shall be
in writing and shall be deemed sufficient if personally delivered, sent by
nationally-recognized overnight courier, by facsimile, or by registered or
certified mail, return receipt requested and postage prepaid, addressed as
follows:

     if to DGHA, to:

               D. George Harris & Associates, Inc.
               399 Park Avenue
               32nd Floor
               New York, New York 10022
               Attention:  Anthony J. Petrocelli
               Telecopier: (212) 207-6450
               Telephone:  (212) 207-6405

     if to the Companies:

               USS Holdings, Inc.
               c/o U.S. Silica Company
               P.O. Box 187
               Berkeley Springs, WV  25411
               Attention:  President
               Telecopier:  (304) 258-3500
               Telephone:   (304) 258-2500

                                       5
<PAGE>

     with a copy to:

               Chase Venture Capital Associates, L.P.
               c/o Chase Capital Partners
               380 Madison Avenue
               12th Floor
               New York, NY  10017-2070
               Attention:    Timothy J. Walsh
               Telecopier:  (212) 622-3755
               Telephone:  (212) 622-3054

or to such other address as the party to whom notice is to be given may have
furnished to each other party in writing in accordance herewith.  Any such
notice or communication shall be deemed to have been received (a) in the case of
personal delivery, on the date of such delivery, (b) in the case of nationally-
recognized overnight courier, on the next business day after the date when sent,
(c) in the case of facsimile transmission, when received, and (d) in the case of
mailing, on the third business day following that on which the piece of mail
containing such communication is posted.

     Section 9.  Benefits of Agreement.
                 ---------------------

     This Agreement shall bind and inure to the benefit of any successors to or
assigns of DGHA and the Companies; provided, however, that this Agreement may
not be assigned by any party hereto without the prior written consent of the
other parties.  The obligations of the Companies hereunder shall be joint and
several.

     Section 10.  Governing Law.
                  -------------

     This Agreement shall be governed by and construed and enforced in
accordance with the laws of the State of New York (without giving effect to
principles of conflicts of laws).

     Section 11.  Entire Agreement; Amendments.
                  ----------------------------

     This Agreement contains the entire understanding of the parties with
respect to its subject matter, and neither it nor any part of it may in any way
be altered, amended, extended, waived, discharged or terminated except by a
written agreement signed by each of the parties hereto.

     Section 12.  Counterparts.
                  ------------

     This Agreement may be executed in counterparts, and each such counterpart
shall be deemed to be an original instrument, but all such counterparts together
shall constitute but one agreement.

                                       6
<PAGE>

     Section 13.  Waivers.
                  -------

     Any party to this Agreement may, by written notice to the other parties,
waive any provision of this Agreement.  The waiver by any party of a breach of
any provision of this Agreement shall not operate or be construed as a waiver of
any subsequent breach.

                             *    *    *    *    *

                                       7
<PAGE>

          IN WITNESS WHEREOF, the parties have duly executed this Management
Services Agreement as of the date first above written.

                              USS HOLDINGS, INC.

                              By:  /s/
                                 ------------------------
                                Name:
                                Title:

                              USS INTERMEDIATE HOLDCO, INC.

                              By:  /s/
                                 ------------------------
                                Name:
                                Title:

                              U.S. SILICA COMPANY

                              By:  /s/ Richard E. Goodell
                                 ------------------------
                                Name:
                                Title:

                              D. GEORGE HARRIS & ASSOCIATES, INC.

                              By:   /s/
                                 ------------------------
                                Name:
                                Title:

                                       8
<PAGE>

                                                                       EXHIBIT A
                                                                       ---------

Fiscal Year                                                              EBITDA
-----------                                                              ------

 Fiscal Year Ending December 31, 1998                                   $30,986
 Fiscal Year Ending December 31, 1999                                    33,222
 Fiscal Year Ending December 31, 2000                                    35,607

<PAGE>

                                                                       EXHIBIT B
                                                                       ---------

                                                                       Aggregate
     For any fiscal year                                            Compensation
     -------------------                                            ------------

Actual EBITDA equal to or greater
  than 118% of Budgeted EBITDA                                          $804,570

Actual EBITDA equal to or greater
  than 116% of Budgeted EBITDA but less
  than 118% of Budgeted EBITDA                                          $777,751

Actual EBITDA equal to or greater
  than 114% of Budgeted EBITDA but less
  than 116% of Budgeted EBITDA                                          $750,932

Actual EBITDA equal to or greater
  than 112% of Budgeted EBITDA but less
  than 114% of Budgeted EBITDA                                          $724,113

Actual EBITDA equal to or greater
  than 110% of Budgeted EBITDA but less
  than 112% of Budgeted EBITDA                                          $697,294

Actual EBITDA equal to or greater
  than 108% of Budgeted EBITDA but less
  than 110% of Budgeted EBITDA                                          $670,475

Actual EBITDA equal to or greater
  than 106% of Budgeted EBITDA but less
  than 108% of Budgeted EBITDA                                          $643,656

Actual EBITDA equal to or greater
  than 104% of Budgeted EBITDA but less
  than 106% of Budgeted EBITDA                                          $616,837

Actual EBITDA equal to or greater
  than 102% of Budgeted EBITDA but less
  than 104% of Budgeted EBITDA                                          $590,018

Actual EBITDA equal to or greater
  than 100% of Budgeted EBITDA but less
  than 102% of Budgeted EBITDA                                          $563,199

<PAGE>

                                                                      Aggregate
     For any fiscal year                                           Compensation
     -------------------                                           ------------

Actual EBITDA equal to or greater
  than 98% of Budgeted EBITDA but less
  than 100% of Budgeted EBITDA                                         $536,380

Actual EBITDA equal to or greater
  than 96% of Budgeted EBITDA but less
  than 98% of Budgeted EBITDA                                          $509,561

Actual EBITDA equal to or greater
  than 94% of Budgeted EBITDA but less
  than 96% of Budgeted EBITDA                                          $482,742

Actual EBITDA equal to or greater
  than 92% of Budgeted EBITDA but less
  than 94% of Budgeted EBITDA                                          $455,923

Actual EBITDA equal to or greater
  than 90% of Budgeted EBITDA but less
  than 92% of Budgeted EBITDA                                          $429,104

Actual EBITDA equal to or greater
  than 88% of Budgeted EBITDA but less
  than 90% of Budgeted EBITDA                                          $402,285

Actual EBITDA equal to or greater
  than 86% of Budgeted EBITDA but less
  than 88% of Budgeted EBITDA                                          $375,466

Actual EBITDA equal to or greater
  than 84% of Budgeted EBITDA but less
  than 86% of Budgeted EBITDA                                          $348,647

Actual EBITDA equal to or greater
  than 82% of Budgeted EBITDA but less
  than 84% of Budgeted EBITDA                                          $321,828

Actual EBITDA equal to or greater
  than 80% of Budgeted EBITDA but less
  than 82% of Budgeted EBITDA                                          $295,009

Actual EBITDA less than 80% of
  Budgeted EBITDA                                                      $268,190

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