AMENDMENT TO LOAN DOCUMENTS


     Amendment  made as of June  30,  1998  by and  among  STV  GROUP,  INC.,  a
Pennsylvania  corporation  ("STV")  and  STV's  consolidated  subsidiaries  (the
"Subsidiaries"),  as follows:  STV  INCORPORATED,  a New York  corporation,  STV
ARCHITECTS,  INC.,  a  Pennsylvania  corporation,  STV  ENVIRONMENTAL,  INC.,  a
Pennsylvania corporation,  STV INTERNATIONAL,  INC., a Pennsylvania corporation,
STV SURVEYING,  INC., a Delaware corporation,  and STV CONSTRUCTION  SERVICES, a
Pennsylvania  corporation  (collectively  referred  to as  the  "Borrowers"  and
individually as "Borrower"),  and FIRST UNION NATIONAL BANK, successor by merger
to CORESTATES BANK, N.A.,  successor by merger to FIRST  PENNSYLVANIA  BANK N.A.
("Bank") to amend and modify the existing Loan Agreement ("Loan  Agreement") and
the Security  Agreement,  each dated  February  28, 1986 and each as  heretofore
amended   together  with  all  related   agreements   issued  pursuant   thereto
(collectively, the "Loan Documents").

     The  Borrowers  and the Bank have  agreed to reduce the  maximum  available
amount of the Line of Credit  from  $16,500,000  to  $15,500,000,  to reduce the
interest  rate on the Line of Credit  to Prime  Rate and to make  certain  other
changes to the Loan Documents.

     NOW,  THEREFORE,  under the laws of the Commonwealth of  Pennsylvania,  the
Borrowers,  jointly and  severally,  and the Bank,  each intending to be legally
bound  hereby  and  for  good  and  valuable  consideration,   the  receipt  and
sufficiency of which are hereby acknowledged, agree as follows:

     1. Definitions. This Amendment constitutes the Eighth Amendment to the Loan
Agreement and is intended to amend the Loan Documents as of the date hereof. All
terms used  herein as defined  terms,  but not  defined  herein,  shall have the
meanings ascribed to them in the Loan Documents.

     2. Amendments to Line of Credit. The parties agree that:

          (a) Section  1.1(a) of the Loan Agreement is hereby amended to read in
its entirety as follows:

                    "Subject  to the  terms  and  conditions  hereof  and in the
          absence one or more unwaived  events of default  under this  Agreement
          and/or a pending demand by the Bank for payment under the Demand Note,
          the Bank agrees to lend and relend to Borrowers from time to time such
          sum or sums of money as may be requested by the  Borrowers  and as the
          Bank, in it sole  discretion,  may approve,  which shall not exceed in
          aggregate principal amount at any one time outstanding Fifteen Million
          Five Hundred  Thousand Dollars  ($15,500,000)  (the "Line of Credit").
          The Line of  Credit  shall be  evidenced  by the  Eighth  Amended  and
          Restated  Demand Note (the "Eighth  Amended and Restated Demand Note")
          in the form attached hereto."

          (b) All  references  in the Loan  Documents  to  "Demand  Note"  shall
henceforth  be deemed to refer to the Eighth  Amended and Restated  Demand Note,
the form of which is attached hereto as Exhibit "A".




          (c) The first  sentence  of Section  1.1(b) of the Loan  Agreement  is
hereby amended to read in its entirety as follows:

                    "Subject to the terms and conditions hereof and of a certain
          Standby Letter of Credit and Security Agreement executed by all of the
          Borrowers under even date herewith (the "L/C Agreement"),  Bank hereby
          agrees, in its sole option to issue standby letters of credit upon the
          request of the  Borrowers and for their  account,  provided that at no
          time shall Bank issue letters of credit  aggregating in face amount in
          excess  of  $3,000,000  (the "L/C  Sublimit"),  and at no time may the
          aggregate  loans under the Eighth Amended and Restated Demand Note and
          letters of credit under the L/C Sublimit exceed $15,500,000."

          (d) The First  sentence of Section 3 of the Loan  Agreement  is hereby
amended to read in its entirety as follows:

                    "Interest shall accrue on the unpaid principal  balance from
          time to time outstanding  under the Eighth Amended and Restated Demand
          Note  at an  interest  rate  per  annum  equal  to  the  Bank's  prime
          commercial  rate of interest (which is not necessarily the lowest rate
          charged by the Bank) in effect from time to time, with changes in said
          rate to be effective  immediately  ("Prime Rate"),  based on a 360 day
          year for the actual days elapsed.

     3.  Existing  Security.   Borrowers  hereby  agree  and  confirm  that  all
obligations of the Borrowers  under the Loan Documents  remain in full force and
effect and, together with this Amendment,  are and continue to be secured by the
liens and security  interests set forth in the Loan Documents.  Without limiting
the  generality  of the  foregoing,  the  Borrowers  agree and confirm  that the
security  interests  granted and set forth in Section 2.1 of the Loan  Agreement
and in the  Security  Agreement  apply  with  respect  to each of the  Borrowers
hereunder and remain in full force and effect and, in furtherance thereof,  each
of the Borrowers hereby grants to the Bank a lien upon and security  interest in
the  property and assets of the  Borrowers  described in Section 2.1 of the Loan
Agreement and in the Security Agreement.

     4.  Representations  and  Warranties.  STV and each of the other  Borrowers
hereby represent and warrant to the Bank:

          (a) that all  representations  and warranties  made by each of them in
the Loan Documents remain true and correct on and of this date, as if newly made
on and as of this date,  and no event of default,  or event which with the lapse
of time or giving of notice,  or both, would be an event of default has occurred
and is continuing under the Loan Documents;

          (b)  that no  person  or  entity  has  any  lien,  security  interest,
mortgage,  pledge, charge or encumbrance on any of the assets, real or personal,
tangible  or  intangible,  of STV or 

                                      -2-



any other  Borrower,  except  for the liens  heretofore  granted  to the Bank or
except as to those liens which have been agreed to by the Bank in writing;

          (c) that the  Subsidiaries  identified in the first  paragraph of this
Amendment are all of the  subsidiaries of STV and that each of such Borrowers is
a corporation  duly organized,  validly  existing and in good standing under the
laws of its  state of  incorporation  (as set  forth  on  Exhibit  "B"  attached
hereto),  is duly qualified as a foreign  corporation and is in good standing in
all other  jurisdictions  in which the  failure  to do so could  have a material
adverse affect on its financial  condition or business  operations;  each of the
Borrowers has the  authority and legal right to take all actions  required of it
hereunder,  and all such corporate  actions have been taken;  and no such action
contravenes  the provisions of the charter or by-laws of any of the Borrowers or
any note, indenture, contract or agreement to which it is a party or by which it
or any of its property is bound;

          (d) that,  except as set forth on Exhibit "C", all of the subsidiaries
of STV are  Borrowers and are parties to this  Amendment and the Eighth  Amended
and Restated  Demand Note and that such  subsidiaries  listed on Exhibit "C" are
inactive and do not own any assets in excess of $25,000 in the aggregate.

          (e) the Loan Documents are and remain valid, binding,  enforceable and
in full force and effect as of the date hereof,  and none of the  Borrowers  (or
any other party to the Loan Documents) has any defense, setoff, counterclaim, or
challenge  against  the  payment of any of the sums owing under the terms of the
Loan Documents or the enforcement or validity of any of the terms thereof.

     5.  Conditions.  As  conditions  precedent  to the  effectiveness  of  this
Amendment:

          (a) Each of the Borrowers shall have furnished the Bank with certified
copies  of  resolutions  adopted  by its  Board  of  Directors  authorizing  the
execution  and  delivery of this  Amendment  and all  reasonable  and  necessary
actions ancillary thereto.

          (b) STV shall have paid or  reimbursed  the Bank for the Bank's  costs
and expenses in connection with this Amendment.

     6. Further  Assurances.  Each of the Borrowers hereby agrees to execute and
deliver to Bank such additional  agreements and other  documentation,  including
such UCC-1 and UCC-3 financing  statements (and to pay all costs and expenses of
the Bank in  connection  therewith),  as Bank may request from time to time,  to
assure the perfection, protection and enforcement of the Bank's rights under the
Loan Documents and hereunder.

     7. Effect of Amendment;  Continuing Validity.  Except as expressly provided
in this  Amendment,  the Loan Documents shall remain in full force and effect in
accordance with their respective  terms.  Without limiting the generality of the
foregoing, nothing in this Amendment shall be construed to:

                                      -3-



          (a)  impair  the  validity,  perfection  or  priority  of any  lien or
security interest securing the Liabilities;

          (b) waive,  release or impair any  rights,  powers or  remedies of the
Bank under the Loan Documents;

          (c)  require  the Bank to  further  modify any  provision  of the Loan
Documents; or

          (d) require the Bank to make any loans or other  extensions  of credit
to the Borrowers.

In the event of any  inconsistency  between the terms of this  Amendment and the
Loan Documents, this Amendment shall govern. Except as expressly amended hereby,
all terms and conditions of the Loan  Documents  remain in full force and effect
as written and to that end all such provisions are deemed incorporated herein by
reference.   Borrower  acknowledges  that  it  has  consulted  with  counsel  in
connection with the negotiation and delivery of this Amendment.

     IN WITNESS WHEREOF, each of the undersigned has caused this Amendment to be
executed by its duly authorized officers as of the date first above written.

STV GROUP, INC.                              STV ENVIRONMENTAL, INC.

By:  /s/ Peter W. Knipe                      By:  /s/ Peter W. Knipe          
     ----------------------                       ----------------------------


STV ARCHITECTS, INC.                         STV INCORPORATED

By:  /s/ Peter W. Knipe                      By:  /s/ Peter W. Knipe         
     ----------------------                       ----------------------------


STV SURVEYING, INC.                          STV INTERNATIONAL, INC.

By:  /s/ Peter W. Knipe                      By:  /s/ Peter W. Knipe     
     ----------------------                       ----------------------------


                                             STV CONSTRUCTION SERVICES

                                             By:  /s/ Peter W. Knipe   
                                                  ----------------------------


                                             FIRST UNION NATIONAL BANK

                                             By:  /s/ Margaret A. Byrne 
                                                  ----------------------------

                                      -4-



                                    EXHIBIT A

                     EIGHTH AMENDED AND RESTATED DEMAND NOTE



$15,500,000                                         Philadelphia, PA
                                                    June __, 1998



     FOR VALUE  RECEIVED,  STV GROUP,  INC.,  a  Pennsylvania  corporation,  STV
INCORPORATED,  a New York  corporation,  STV  ARCHITECTS,  INC., a  Pennsylvania
corporation  and  STV  ENVIRONMENTAL,  INC.,  a  Pennsylvania  corporation,  STV
INTERNATIONAL, INC., a Pennsylvania corporation, STV SURVEYING, INC., a Delaware
corporation, STV CONSTRUCTION SERVICES, a Pennsylvania corporation (individually
a "Borrower" and  collectively,  "Borrowers"),  jointly and severally promise to
pay ON DEMAND,  without  defalcation,  to the order of FIRST UNION NATIONAL BANK
(the "Bank") FIFTEEN MILLION FIVE HUNDRED THOUSAND DOLLARS ($15,500,000) or such
lesser  outstanding  principal  balance as may be outstanding  from time to time
hereunder, and to pay interest on the unpaid principal balance from time to time
outstanding  hereunder at a  fluctuating  rate per annum equal to the Prime Rate
(hereinafter  defined).  "Prime  Rate" means that rate of interest  periodically
established by the Bank and designated its Prime Rate (which is not  necessarily
the lowest rate charged by the Bank),  as such rate may change from time to time
with changes therein  effective  immediately.  All interest  accruing  hereunder
shall be payable monthly in arrears upon the first business day of each calendar
month or upon demand; all such interest shall be computed on the basis of actual
days elapsed and a year of 360 days.

     Any amount payable hereunder which is not paid when due shall bear interest
from the day when due until paid in full,  at a  fluctuating  interest  rate per
annum  equal at all times to the Prime Rate plus three  percent  (3%);  all such
interest shall be payable on demand.  Notwithstanding any other provision of the
Loan Agreement,  interest paid or becoming due hereunder shall in no event be in
an amount or computed at a rate which is prohibited by applicable statute.  Both
principal  and  interest  are  payable in lawful  money of the United  States of
America in same day funds to the Bank at its principal  office in  Philadelphia,
Pennsylvania, or at such other place as the Bank may designate.

     Payment of this Note shall not be  subject  to any  counterclaim,  set-off,
recoupment or defense of any kind by or in the right of the  Borrowers,  and the
Borrowers hereby expressly and irrevocably waive any right such Borrower may now
or at any  time in the  future  have to bring or  assert  any such  counterclaim
set-off,  recoupment  or defense.  It is the  intention of the Borrowers and the
holder  thereof that this Note shall be paid  absolutely  according to its terms
and that the  Borrowers  shall  pursue any  claims  such  Borrowers  may have by
independent action.






     The Borrowers agree to pay, and to hold the holder hereof harmless from and
against, all liabilities for expenses arising in connection with the enforcement
by the holder of its rights under this Note and the Loan Agreement.

     This Eighth  Amendment and Restated Demand Note is the Demand Note referred
to in, and is entitled to the benefits of, the Loan Agreement dated February 28,
1986, as amended  thorough the date hereof by amendments no. 1 through no. 8 (as
so amended,  the "Loan  Agreement") by and among the Borrowers and the Bank, and
the Security  Agreement dated February 28, 1986, as amended (as so amended,  the
"Security  Agreement")  by and among the Borrowers and the Bank, and is entitled
to the  benefits of the  security  interest  granted to the Bank therein and the
guaranties thereunder.

     This  Eighth  Amended  and  Restated  Demand  Note has been  issued  by the
Borrowers to amend and restate the prior amended and restated demand notes,  and
all amounts  outstanding  or accrued under said prior notes shall be outstanding
and accrued under this Eighth Amended and Restated  Demand Note, and this Eighth
Amended and Restated Demand Note is not a novation but shall be deemed to be one
and the same  instrument  as said prior notes except as expressly  amended under
the Loan Agreement.


                                      -2-


     IN WITNESS WHEREOF,  the undersigned have duly executed this Eighth Amended
and Restated Demand Note by their respective duly authorized officers.


STV GROUP, INC.                              STV INCORPORATED

By:  /s/ Peter W. Knipe                      By:   /s/ Peter W. Knipe 
     ------------------------------                ----------------------------
Attest:  /s/ Anna Marie Boore                Attest:  /s/ Anna Marie Boore 
         --------------------------                   -------------------------
                  (Corporate Seal)                    (Corporate Seal)


STV ARCHITECTS, INC.                         STV ENVIRONMENTAL, INC.

By:  /s/ Peter W. Knipe                      By:   /s/ Peter W. Knipe
     ------------------------------                ----------------------------

Attest:  /s/ Anna Marie Boore                Attest:  /s/ Anna Marie Boore    
         --------------------------                   -------------------------
                  (Corporate Seal)                    (Corporate Seal)


STV SURVEYING, INC.                          STV INTERNATIONAL, INC.

By:  /s/ Peter W. Knipe                      By:   /s/ Peter W. Knipe 
     ------------------------------                ----------------------------

Attest:  /s/ Anna Marie Boore                Attest:  /s/ Anna Marie Boore  
         --------------------------                   --------------------------
                  (Corporate Seal)                    (Corporate Seal)


                                             STV CONSTRUCTION SERVICES

                                             By:  /s/ Peter W. Knipe  
                                                  ------------------------------
                                             Attest:  /s/ Anna Marie Boore  
                                                      --------------------------
                                                      (Corporate Seal)

                                      -3-



                                    EXHIBIT B

                      BORROWERS AND STATES OF INCORPORATION


STV Group, Inc.......................................a Pennsylvania corporation
STV Incorporated.........................................a New York corporation
STV Architects, Inc..................................a Pennsylvania corporation
STV Environmental, Inc...............................a Pennsylvania corporation
STV International, Inc...............................a Pennsylvania corporation
STV Surveying, Inc.......................................a Delaware corporation
STV Construction Services............................a Pennsylvania corporation






                                    EXHIBIT C

                           SUBSIDIARIES NOT BORROWERS

STV Engineering, Inc..........................................a Ohio corporation
STV Construction, Inc.................................a Pennsylvania corporation
STV/WAI, Inc..........................................a Pennsylvania corporation
STV Michael Lynn Associates, Inc..........................a New York corporation