EXHIBIT 4.6

THIS SECURITIES PURCHASE AGREEMENT,  as it may be amended from time to time (the
"Agreement"),  dated as of the 24th day of June  1998,  is  entered  into by and
among ENVIRONMENTAL REMEDIATION HOLDING CORPORATION, a Colorado corporation (the
"Company");  and the persons and/or entities who have executed this Agreement on
the  signature  pages  hereof  (hereinafter   referred  to  individually  as  an
"Investor" and collectively as the "Investors").

                                   WITNESSETH:

WHEREAS, the Company desires to sell to the Investors,  and the Investors desire
to  purchase  from the  Company,  certain  convertible  notes of the Company and
warrants  entitling the Investors to purchase certain shares of capital stock of
the  Company,  for the  respective  purchase  prices  and  upon  the  terms  and
conditions hereinafter set forth;

NOW, THEREFORE, in consideration of the premises and the mutual covenants herein
contained, the parties hereby agree as follows:

1.       AUTHORIZATION OF ISSUE.

The Company has  authorized the issuance and sale to the Investors of: (i) up to
$2,500,000 principal amount of the Company's 5.5% convertible notes due June 23,
2000 (the  "Notes");  and (ii) common stock purchase  warrants (the  "Warrants")
entitling  the  holders  thereof  to  purchase,  for an  amount  per share to be
determined  by  formula,  that being 120% of the  average  of the  "Closing  Bid
Price",  as that term is defined in the Notes, of the Company's  Common Stock on
the Closing Date (as hereinafter  defined) (the "Exercise Price"),  an aggregate
number of shares of Common  Stock  equal to ten  percent  (10%) of the  original
principal  balance  of the  Notes,  par value  $.0001  per share  (the  "Warrant
Shares") of the Company.

(a)      The Notes shall be substantially in the form of Exhibit A annexed
hereto and made a part hereof.

(b)      The Warrants shall be substantially in the form of Exhibit B
annexed hereto and made a part hereof.

2.       ISSUANCE OF NOTES AND WARRANTS; REGISTRATION OF CONVERSION SHARES
AND OPTION SHARES.

(a) Issuance of Notes and Warrants.  On the terms and subject to the  conditions
hereinafter set forth, on the Closing Date (as hereinafter defined), the Company
will  issue  and sell to each  Investor  the  principal  amount of Notes and the
number of Warrants set forth opposite the name of each such Investor on Schedule
I hereto and made a part hereof.

(b) Purchase  Price:  Payment.  The  purchase  price for each of the Notes shall
equal 100% of the aggregate  principal amount thereof and the purchase price for
each Warrant shall be one/one hundredth of one cent ($.0001), or an aggregate of
$25.00 for all Warrants.  The purchase  price payable by each Investor  shall be
the amount  set forth  opposite  the name of each such  Investor  on  Schedule 1
annexed  hereto.  The purchase price for the Notes and Warrants shall be paid at
the Closing by wire transfer of immediately  available  funds or by certified or
bank cashier's  checks (at the option of the Investors)  payable to the order of
the Company, or otherwise as acceptable to the Company. The purchase price shall
be payable by each  Investor  against  delivery of the Notes and Warrants  being
purchased by it, all of which shall be registered in the name of the  respective
Investor purchasing such Notes and Warrants.

(c) Registration of Conversion Shares and Warrant Shares. The Company shall file
with the United States  Securities and Exchange  Commission  ("SEC") and use its
best efforts to cause to be declared effective a Form S-1 Registration Statement
or other  appropriate  form of  registration in order to register for resale and
distribution  under the  Securities  Act of 1933,  as amended  (the  "Securities
Act"),  all shares of Common  Stock of the Company  issuable  upon  voluntary or
mandatory  conversion  of all Notes (the  "Conversion  Shares")  and all Warrant
Shares.  The obligations of the Company to so register the Conversion Shares and
Warrant Shares are set forth in the registration rights agreement, dated of even
date herewith and in the form of Exhibit C annexed hereto and made a part hereof
(the "Registration Rights Agreement").

3.       REPRESENTATIONS AND WARRANTIES OF THE COMPANY.

As used in this Agreement,  the term "Subsidiary" or "Subsidiaries"  shall mean:
(i) the  individual  or  collective  reference  to the  corporations  listed  on
Schedule 2 annexed hereto and made a part hereof, including, without limitation,
Bass American  Petroleum  Corp.  ("BAPCO").  The Company  hereby  represents and
warrants to the Investors, as follows:

(a)  Organization  and Good  Standing.  The  Company  and  each of its  existing
Subsidiaries  is a  corporation  duly  organized,  validly  existing and in good
standing under the laws of its state of incorporation, with full corporate power
and  authority  to own its  properties  and carry on its  business  as now being
conducted.  Each of the Company and such  Subsidiaries is qualified as a foreign
corporation and is in good standing in each jurisdiction in which the conduct of
its business or the ownership of its assets requires such qualification.

(b)  Capitalization  of the  Company.  The  authorized,  issued and  outstanding
capital  stock  of  the  Company  is  described  on  the   Company's   Form  S-1
supplementally  submitted to the Securities and Exchange  Commission (the "SEC")
on  January  8, 1998 (the  "Form  S-1").  The  Company's  Form S-1 and all other
documents and reports filed by the Company and/or its Subsidiaries  with the SEC
since October 1, 1995 (the "SEC  Documents") have been furnished to or otherwise
made available to the Investors or their representatives. The authorized, issued
and  outstanding  shares  of  capital  stock  of  each of the  Subsidiaries  are
disclosed on the SEC Documents.

(c)  Authorization,  Execution  and Effect of  Agreements.  The  Company has all
requisite  corporate  power and  authority  to execute,  deliver and perform its
obligations under this Agreement and the Registration  Rights Agreement to issue
the Notes and the  Warrants  in the manner and for the purpose  contemplated  by
this Agreement,  and to execute,  deliver and perform its obligations under this
Agreement,  the  Notes,  the  Warrants  and the  Registration  Rights  Agreement
(collectively,  the  "Transaction  Documents")  and  all  other  agreements  and
instruments  heretofore or hereafter executed and delivered by it pursuant to or
in

connection  with this  Agreement.  The execution and delivery of the Transaction
Documents and the consummation of the transactions contemplated hereby have been
duly authorized by all necessary corporate action of the Company. This Agreement
and the other  Transaction  Documents have each been duly executed and delivered
and  constitutes,  and upon  execution and delivery in accordance  herewith each
other  agreement or instrument  executed and  delivered by the Company  pursuant
hereto, including the Notes and Warrants, will constitute,  the legal, valid and
binding  obligations  of  the  Company,   enforceable  against  the  Company  in
accordance with their respective terms, subject in each such case, to applicable
bankruptcy,  insolvency,  reorganization  and similar laws affecting  creditors'
rights and remedies  generally  and subject,  as to  enforceability,  to general
principles  of  equity  (regardless  of  whether  enforcement  is  sought  in  a
proceeding at law or in equity).

(d)  Conflicting  Agreements  and Other  Matters.  The  execution,  delivery and
performance  by  the  Company  of  this  Agreement  and  the  other  Transaction
Documents,  and all other agreements and instruments  heretofore or hereafter to
be executed and delivered by the Company in connection with the  consummation of
the  transactions  contemplated  by this  Agreement  and the  other  Transaction
Documents,  and compliance by the Company with the terms and  provisions  hereof
and thereof  applicable to it,  including the issuance and sale of the Notes and
Warrants,  does not and will not (i) violate  any  provision  of any law,  rule,
regulation, order, writ, judgment, decree, administrative determination or award
having  applicability to the Company or any of the Subsidiaries or (ii) conflict
with or result in a breach of or constitute a default under the  Certificate  of
Incorporation  or By-Laws  of the  Company  or any of the  Subsidiaries,  or any
indenture  or loan or credit  agreement,  or any  other  material  agreement  or
instrument,  to which the  Company or any of the  Subsidiaries  is a party or by
which the Company or the Subsidiaries, or any of their respective properties are
bound or affected, and will not result in, or require the creation or imposition
of,  any lien upon or with  respect  to any of the  properties  now owned by the
Company or any of the  Subsidiaries or hereafter  acquired by the Company or any
of the Subsidiaries.

(e) Financial Information.  The (i) audited consolidated financial statements of
the  Company for the fiscal  year ended  September  30, 1997 as set forth in the
Company's Form 10-K/A filed with the SEC (the

"1998 Form 10-K") and (ii) the unaudited financial statements of the Company for
the nine  months  ended  December  31, 1997 as set forth in the  Company's  Form
10-Q/A filed with the SEC, as amended from time to time (the "1998 Form 10Q/A"),
were  prepared in  accordance  with  generally  accepted  accounting  principles
("GAAP")  consistently  applied,  and fairly present the financial condition and
results of  operations  of the  Company  and the  Subsidiaries  for the  periods
indicated  therein;  provided,  that the unaudited  financial  statements do not
contain certain footnote  disclosures  required under GAAP for audited financial
statements and are subject to year end audit adjustments, none of which would be
material to an Investor's decision to purchase the Notes and Warrants.

(f) Litigation, Proceedings: Defaults. Except as disclosed on the SEC Reports or
on Schedule 3(f) hereto, there is no action,  suit,  proceeding or investigation
pending or, to the knowledge of the Company, threatened against or affecting the
Company or any of the Subsidiaries or any of their respective  properties before
or by any court,  governmental or regulatory authority (federal, state, local or
foreign)  which either (i) relates to or challenges  the  legality,  validity or
enforceability  of this  Agreement  or any other  document  or  agreement  to be
executed and delivered by the Company pursuant hereto or in connection herewith,
or (ii) if determined  adversely (A) would have a material adverse effect on the
condition (financial or otherwise),  properties,  assets, business or results of
operations  of the  Company or the  Subsidiaries,  when taken as a  consolidated
whole (a  "Material  Adverse  Effect")  after giving  effect to the  transaction
contemplated by this Agreement,  or (B) could  materially  impair the ability or
obligation of the Company or the Subsidiaries to perform fully on a timely basis
any  obligation  which it has or will have  under  this  Agreement  or the other
Transaction  Documents,  or  any  other  agreement  or  document  heretofore  or
hereafter  to be  executed  by the  Company  pursuant  hereto  or in  connection
herewith. Neither the Company nor any of the Subsidiaries is in violation of its
Certificate  of  Incorporation  or  By-Laws.  Neither the Company nor any of the
Subsidiaries  is (i) in  default  under or in  violation  of any other  material
agreement  or  instrument  to  which  it is a party or by which it or any of its
properties  are bound or  affected,  which  default  or  violation  would have a
Material Adverse Effect, (ii) in default with respect to any order of any court,
arbitrator or governmental body or subject to or party to any order of any court
or governmental

authority  arising out of any action,  suit or  proceeding  under any statute or
other law respecting antitrust, monopoly, restraint of trade, unfair competition
or similar matters, or (iii) in violation of any statute,  rule or regulation of
any governmental authority material to its business.

(g) Governmental Consents, etc. No authorization,  consent,  approval,  license,
qualification  or  formal  exemption  from,  nor  any  filing,   declaration  or
registration with, any court, governmental agency or regulatory authority or any
securities exchange or any other person or entity (collectively  "Approvals") is
required  in  connection  with the  execution,  delivery or  performance  by the
Company of this Agreement.

(h) Use of Proceeds.  The first  $1,250,000  of the proceeds to the Company from
the sale of the Notes shall be used (i)  $250,000  for general  working  capital
purposes, and (ii) $1,000,000 to perform certain obligations under its June 1997
joint venture agreement with the Democratic  Republic of Sao Tome & Principe for
the  development of potential oil and gas reserves in the Gulf of Guinea of West
Africa (the "Sao Tome  Project"),  with the balance,  if any used by the Company
for additional  payments for general working  capital  purposes or to perform on
its obligations to the Sao Tome Project, as the Company so directs.

(i)  Accuracy  of all SEC  Public  Filings,  All SEC  Reports  furnished  to the
Investors or their  representatives and all other documents and reports filed by
or on behalf of the Company with the SEC, when filed, did not contain any untrue
statement  of a material  fact or omit to state a material  fact  required to be
stated therein or necessary in order to make the statements therein, in light of
the  circumstances  under which they were made, not misleading.  The Company and
each of its  Subsidiaries  has filed,  on a timely  basis,  all required  forms,
reports and  documents  with the SEC  required to be filed by it pursuant to the
Securities  Act and the  Securities  and Exchange  Act of 1934,  as amended (the
"Exchange  Act"),  all of which  complied at the time of filing in all  material
respects with all applicable requirements of the Securities Act and the Exchange
Act.

(j)  Absence of  Certain  Changes or  Events.  Since  June 30,  1997,  except as
contemplated  by this  Agreement,  disclosed on Schedule  3(j) hereto and made a
part hereof, or disclosed in any Company SEC Report filed

since June 30,  1997,  the Company and the  Subsidiaries  have  conducted  their
businesses  only in the  ordinary  course and in a manner  consistent  with past
practice  and,  in the  Company's  opinion,  there has not been (i) any event or
events having, individually or in the aggregate, a Material Adverse Effect, (ii)
any change by the Company in its  accounting  methods,  principles or practices,
(iii) any revaluation by the Company of any material asset  (including,  without
limitation, any writing down or writing up of the value of oil and gas reserves,
writing off of notes or accounts  receivable  or  reversing  of any  accruals or
reserves),  other than in the ordinary  course of business  consistent with past
practice, (iv) any entry by the Company or any Subsidiary into any commitment or
transaction  material  to the  Company  and the  Subsidiaries  taken as a whole,
except in the  ordinary  course  of  business  and  consistent  in all  material
respects with past practice, or (v) any declaration, setting aside or payment of
any dividend or  distribution  in respect of any capital stock of the Company or
any redemption, purchase or other acquisition of any of its securities.

(k) Absence of Litigation.  Except as disclosed in the Company SEC Reports or in
Schedule3(k)  annexed hereto and made a part hereof,  there is no claim, action,
proceeding or investigation  pending or, to the Company's knowledge,  threatened
against the Company or any  Subsidiary,  or any property or asset of the Company
or any  Subsidiary,  before any court,  arbitrator  or  Governmental  Authority,
which,  individually or when aggregated with other claims, actions,  proceedings
or  investigations  or  product  liability  claims,   actions,   proceedings  or
investigations   which  are   reasonably   likely  to  result   from  facts  and
circumstances  that  have  given  rise to such a claim,  action,  proceeding  or
investigation,  would have a Material  Adverse  Effect.  As of the date  hereof,
neither the Company nor any  Subsidiary nor any property or asset of the Company
or any Subsidiary is subject to any order, writ, judgment,  injunction,  decree,
determination  or award having,  individually  or in the  aggregate,  a Material
Adverse Effect.

(l) Labor Matters.  Except as set forth in Schedule 3(l) annexed hereto and made
a part hereof, with respect to employees of the Company:

         (i) to the best of the Company's knowledge, no senior executive or key

         employee has any plans to terminate employment with the Company or  any
         of its Subsidiaries;

         (ii) there is no unfair labor practice charge or complaint  against the
Company  or any of its  Subsidiaries  pending  or, to the best of the  Company's
knowledge,  threatened  before the National Labor  Relations  Board or any other
comparable authority;

         (iii) there is no demand for recognition made by any labor organization
or petition for election  filed with the National Labor  Relations  Board or any
other comparable authority which, individually or in the aggregate, would have a
Material Adverse Effect;

         (iv) no grievance or any arbitration proceeding arising out of or under
collective  bargaining  agreements  is pending and, to the best of the Company's
knowledge,  no claims  therefor have been  threatened  other than  grievances or
arbitrations incurred in the ordinary course of business which,  individually or
in the aggregate, would not have a Adverse Effect; and

         (v)  there  is  no  litigation,  arbitration  proceeding,  governmental
investigation, administrative charge, citation or action of any kind pending or,
to the  knowledge  of the  Company  or any  of  its  Subsidiaries,  proposed  or
threatened  against the Company  relating to employment,  employment  practices,
terms and conditions of employment or wages and hours which,  individually or in
the  aggregate,  would have a Material  Adverse  Effect.  Except as disclosed in
Schedule  3(l),  none  of  the  Company  nor  any of its  Subsidiaries  has  any
collective   bargaining   relationship   or  duty  to  bargain  with  any  Labor
Organization  (as such term is  defined in Section  2(5) of the  National  Labor
Relations Act, as amended),  and none of the Company nor any of its Subsidiaries
has   recognized   any  labor   organization   as  the   collective   bargaining
representative of any of its employees.

(m) Title to and Sufficiency of Assets.  As of the date hereof,  the Company and
the  Subsidiaries  own,  and  as of  the  Closing  Date,  the  Company  and  the
Subsidiaries  will  own,  good  and  marketable  title  to all of  their  assets
constituting  personal property which is material to their business  (excluding,
for purposes of this sentence,  assets held under leases), free and clear of any
and all mortgages, liens, encumbrances,  charges, claims, restrictions, pledges,
security

interests  or  impositions  (collectively,  "Liens")  except as set forth in the
Company SEC Reports or Schedule 3(m) annexed hereto and made a part hereof. Such
assets,  together with all assets held by the Company and the Subsidiaries under
leases,  include all tangible and intangible  personal  property,  contracts and
rights necessary or required for the operation of the businesses of the Company.
As of the date  hereof,  the Company  and the  Subsidiaries  own,  and as of the
Closing Date,  the Company and the  Subsidiaries  will own, good and  marketable
title to all of their real  estate,  including  oil and gas  reserves,  which is
material to such persons  (excluding,  for purposes of this sentence,  leases to
real  estate  and oil and gas  reserves),  free and clear of any and all  Liens,
except as set forth in the  Company  SEC  Reports or in  Schedule  3(m)  annexed
hereto or such other Liens which would not,  individually  or in the  aggregate,
have a Material Adverse Effect.  Such assets,  together with real estate and oil
and gas reserve  assets held by the Company and the  Subsidiaries  under leases,
are adequate for the operation of the  businesses  of the Company,  as presently
conducted.  The  leases to all real  estate and oil and gas  reserves  which are
material to the operations of the businesses of the Company and the Subsidiaries
are in full force and effect and no event has occurred  which,  with the passage
of time, the giving of notice,  or both,  would constitute a default or event of
default by the Company or any  Subsidiary  or, to the  knowledge of the Company,
any other person who is a party signatory  thereto,  other than such defaults or
events of default  which,  individually  or in the  aggregate,  would not have a
Material Adverse Effect.

(n) Environmental  Matters. For purposes of this Agreement,  the following terms
shall have the following meanings:

         (i) "Hazardous Substances" means

                  (A) petroleum and petroleum products, by-products or breakdown
products,    radioactive   materials,   asbestos-   containing   materials   and
polychlorinated biphenyls, and

                  (B) any other chemicals,  materials or substances regulated as
toxic or hazardous or as a pollutant,  contaminant or waste under any applicable
Environmental Law;

          (ii) "Environmental Law" means any law, past, present or future

and as amended,  and any  judicial  or  administrative  interpretation  thereof,
including any judicial or administrative  order, consent decree or judgment,  or
common law,  relating to pollution or protection of the  environment,  health or
safety or natural resources,  including,  without limitation,  those relating to
the use, handling,  transportation,  treatment,  storage,  disposal,  release or
discharge of Hazardous Substances; and

         (iii) "Environmental Permit" means any permit, approval, identification
number,   license  or  other   authorization   required   under  any  applicable
Environmental Law.

                  (A) Except as disclosed on Schedule  3(n-1) annexed hereto and
made a part  hereof,  the  Company  and the  Subsidiaries  are and have  been in
compliance   with  all  applicable   Environmental   Laws,   have  obtained  all
Environmental  Permits and are in compliance with their  requirements,  and have
resolved  all past  non-compliance  with  Environmental  Laws and  Environmental
Permits without any pending,  on-going or future obligation,  cost or liability,
except in each case for the notices  set forth in Schedule  3(n-1) or where such
non-compliance  would not,  individually  or in the  aggregate,  have a Material
Adverse Effect.

                  (B) Except as disclosed in Schedule  3(n-2) annexed hereto and
made a part  hereof,  neither the Company  nor any of the  Subsidiaries  has (I)
placed,  held,  located,  released,  transported  or disposed  of any  Hazardous
Substances  on,  under,  from  or  at  any  of  the  Company's  or  any  of  the
Subsidiaries'  properties or any other  properties,  other than in a manner that
would not, in all such cases taken individually or in the aggregate, result in a
Company  Material  Adverse  Effect,  (II) any  knowledge  of the presence of any
Hazardous  Substances on, under,  emanating  from, or at any of the Company's or
any of the  Subsidiaries'  properties or any other property but arising from the
Company's  or  any  of  the  Subsidiaries'   current  or  former  properties  or
operations,  other than in a manner that would not result in a Material  Adverse
Effect,  or (III) any knowledge of nor has it received any written notice (x) of
any  violation  of or  liability  under  any  Environmental  Laws,  (y)  of  the
institution or pendency of any suit, action, claim,  proceeding or investigation
by any  Governmental  Entity  or any  third  party in  connection  with any such
violation  or  liability,  (z)  requiring  the  response  to or  remediation  of
Hazardous

Substances at or arising from any of the  Company's or any of the  Subsidiaries'
current  or  former  properties  or  operations  or any other  properties,  (aa)
alleging  noncompliance by the Company or any of the Subsidiaries with the terms
of any  Environmental  Permit  requiring  material  expenditures or resulting in
material  liability or (bb) demanding  payment for response to or remediation of
Hazardous  Substances  at or  arising  from any of the  Company's  or any of the
Subsidiaries'   current  or  former   properties  or  operations  or  any  other
properties,  except in each case for the notices  set forth in  Schedule  3(n-2)
annexed hereto.

(o)  Brokers.  No  broker,  finder or  investment  banker,  is  entitled  to any
brokerage,  finder's  or other fee or  commission  in  connection  with the this
Agreement and the transactions contemplated hereby, other than the following:

         International Holding Company
         Joseph Charles & Associates

(collectively the "IHC Group"). The Company has agreed to pay the IHC Group cash
compensation  not to exceed ten percent  (10.0%) of the face amount of the Notes
sold  pursuant  to this  Agreement  and to issue to the IHC  Group  notes not to
exceed three and one-half  percent  (3.5%) of the face amount of the total notes
sold to the Investors (the "Consultant Notes"),  which Consultant Notes shall be
on  substantially  the same terms and conditions as the Notes offered hereby and
warrants to purchase  shares of Company  Common  Stock in an amount equal to six
percent (6.0%) of the face amount of the Notes on  substantially  the same terms
and conditions as the Warrants offered hereby.

4.       REPRESENTATIONS AND WARRANTIES OF THE INVESTORS.

Each  Investor  hereby  separately  represents  and  warrants  to the Company as
follows (such  representations  and warranties being made separately and only to
the extent such representations and warranties relate to such Investor):

(a) Investigation;  Investment Representation.  Each Investor (i) possesses such
knowledge and experience in financial and business matters that it is capable of
evaluating  the  merits  and risks of its  investment  hereunder;  (ii) has been
afforded the opportunity to ask

questions of, and receive  answers from,  the Company  concerning  the terms and
conditions  of its  investment,  the  transactions  contemplated  hereby and the
business and affairs of the Company;  (iii) has examined, to the extent it deems
appropriate,  all of the agreements  and documents  referred to herein or in the
schedules  hereto  and such  other  documents  that it has  requested;  and (iv)
understands  that the Notes,  the Warrants and the Warrant  Shares are not being
registered under the Securities Act of 1933, as amended,  on the ground that the
issuance  thereof  is  exempt  from  registration  under  Section  4(2)  of  the
Securities Act of 1933, as amended,  as a transaction by an issuer not involving
a public offering, and the Company's reliance on this exemption is predicated in
part on the Investors'  representations and warranties contained in this Section
4(a).  The  Investors  are acquiring the Notes and Warrants and will acquire the
Warrant Shares for their own account,  for investment purposes only and not with
a view to the sale or distribution thereof.

(b) Execution and Effect of Agreement. Each Investor has all necessary power and
authority  to  enter  into  this  Agreement  and  consummate  the   transactions
contemplated  hereby.  This Agreement  constitutes the legal,  valid and binding
obligation  of each  Investor,  enforceable  against each Investor in accordance
with its terms, subject to applicable  bankruptcy,  insolvency,  reorganization,
moratorium and similar laws affecting  creditors' rights and remedies  generally
and subject,  as to enforceability,  to general principles of equity (regardless
of whether enforcement is sought in a proceeding at law or in equity).

5.       COVENANTS.

As long as any of the Notes are outstanding,  the Company agrees that, unless it
first procures the written  consent to act otherwise of the holders of record of
66-2/3%  of the  outstanding  principal  amount  of the  Notes  of  record  then
outstanding, it will use its best efforts to cause each of its Subsidiaries to:

(a) Promptly pay all taxes (exclusive of income taxes imposed on the Investors),
fees and charges payable, or ruled to be payable, by any federal, state or local
authority,  in respect of this Agreement or the execution,  delivery or issuance
of the  Notes or  Warrant  Shares by reason  of any now  existing  or  hereafter
enacted federal, state or

local statute or ordinance,  and indemnify and hold the Investors  harmless from
and against  all  liabilities  with  respect to or in  connection  with any such
taxes, fees or charges.

(b) Maintain  their  corporate  existence  and right to carry on business,  duly
procure  all  necessary  renewals  and  extensions  thereof,  and use their best
efforts to  maintain,  preserve and renew all  necessary  or  desirable  rights,
powers, privileges and franchises owned by them.

(c)  Promptly  notify  the  Investors  of any  material  adverse  change  in the
condition (financial or otherwise),  properties,  assets, business or results of
operations of the Company or any of the Subsidiaries.

(d) Not cause,  suffer or permit any  liquidation,  winding up or dissolution of
the Company or the Subsidiaries.

(e)  Maintain  and cause the  Subsidiaries  to  maintain a system of  accounting
established and  administered in accordance with generally  accepted  accounting
principles.

(f) Comply with all of the covenants  and  agreements on the part of the Company
to be  performed  under  the  terms of the  Notes,  the  Warrants  and the other
Transaction Documents.

(g)  Terminate  the  Private  Equity  Line of Credit  Agreement  by and  between
Kingsbridge  Capital  Limited and the Company dated as of March 23, 1998 and not
enter into a similar agreement with Kingsbridge  Capital Limited while the Notes
are outstanding.

6.       FINANCIAL STATEMENTS; INSPECTION; NON-PUBLIC INFORMATION.

(a) The Company will furnish to each Investor (and their permitted  transferees,
successors and assigns),  as long as such Investor owns any of the Notes, copies
of all Form 10-K Annual Report and Form 10-Q Quarterly  Financial  Reports filed
by the Company, with the SEC.

(b) The Company will,  subject to execution of appropriate  confidentiality  and
non-  disclosure  agreements,  permit the Investors,  as long as they own Notes,
shares of Common Stock  issuable upon  conversion of the Notes (the  "Conversion
Shares"), Warrants or shares

of Common Stock  issuable upon exercise of the Warrants (the "Warrant  Shares"),
or any  authorized  representative  designated  by the  Investors,  to visit and
inspect at the  Investors'  expense any of the properties of the Company and the
Subsidiaries, and to discuss its affairs, finances and accounts with officers of
the Company,  all at such  reasonable  times and as often as the  Investors  may
reasonably request.

(c) The  Company  in no  event  shall  disclose  non-public  information  to the
Investors,  advisors to or  representatives  of the  Investors  unless  prior to
disclosure of such information the Company marks such information as 'Non-Public
Information  -  Confidential"  and provides  the  Investors,  such  advisors and
representatives with a reasonable opportunity to accept or refuse to accept such
non-public  information for review.  Nothing herein shall require the Company to
disclose non-public information to the Investors or their respective advisors or
representatives,  and  the  Company  represents  that it  does  not  disseminate
non-public  information  to any Investors who purchase stock in the Company in a
public offering, to money managers or to securities analysts; provided, however,
that  notwithstanding  anything  herein to the  contrary,  the Company  will, as
hereinabove provided, notify immediately the advisors and representatives of the
Investors  and,  if any,  underwriters,  of any  event or the  existence  of any
circumstance   (without  any  obligation  to  disclose  the  specific  event  or
circumstance)  of which it becomes aware,  constituting  non-public  information
(whether or not requested of the Company  specifically  or generally  during the
course of due diligence by such persons or entities), which, if not disclosed in
the  Prospectus  included  in  the  Registration  Statement,  would  cause  such
Prospectus  to  include  a  material  misstatement  or to omit a  material  fact
required to be stated therein in order to make the statements, therein, in light
of the  circumstances  in which they were made, not  misleading.  Nothing herein
shall be  construed  to mean  that  such  persons  or  entities  other  than the
Investors  (without the written  consent of the Investors prior to disclosure of
such  information)  may not  obtain  non-public  information  in the  course  of
conducting  due  diligence in  accordance  with the terms of this  Agreement and
nothing  herein shall  prevent any such persons or entities  from  notifying the
Company of their  opinion  that based on such due  diligence  by such persons or
entities,  that the  Registration  Statement  contains an untrue  statement of a
material fact or omits a material fact required to be stated in the Registration
Statement or

necessary  to  make  the  statements   contained   therein,   in  light  of  the
circumstances in which they were made, not misleading.

7.       TRANSFER OF NOTES AND WARRANT SHARES.

(a)  Permissible  Transfers.   The  Investors  acknowledge  that  the  Company's
securities  being issued and sold to them hereunder are being so issued and sold
in  transactions  which are exempt  from the  registration  requirements  of the
Securities  Act of 1933, as amended.  None of the Notes or Warrants,  Conversion
Shares or Warrant  Shares  issuable upon  conversion of the Notes or exercise of
the Warrants, may be distributed,  transferred,  or otherwise disposed of by the
Investors except pursuant to an effective  Registration Statement under such Act
which is current with respect to the securities offered thereby,  or pursuant to
an applicable  exemption  therefrom,  and pursuant to  applicable  "Blue Sky" or
state securities laws or an applicable exemption therefrom.

(b) Legend.  Unless the Conversion Shares or Warrant Shares have been registered
pursuant to an effective  Registration  Statement filed under the Securities Act
or held for the requisite period to be freely transferable  pursuant to Rule 144
promulgated  under the Securities Act and otherwise  comply with Rule 144(k) (in
either such case the certificates shall bear no legend), the Company shall cause
to be set forth on the  certificates  representing  any  Conversion  Shares  and
Warrant  Shares  a legend  substantially  in the  following  form:  "The  shares
represented by this  certificate  have not been registered  under the Securities
Act of 1933, as amended.  No transfer of such shares shall be valid or effective
except in  accordance  with an effective  registration  statement  covering such
shares or an opinion of counsel  acceptable to the Company that  registration of
such shares is not  required  pursuant  to the  applicable  requirements  of the
Securities Act of 1933, as amended."

(c) Registration of Conversion Shares and Warrant Shares,  Other Exemption.  The
Company  shall use its best  efforts  to cause  the  Conversion  Shares  and the
Warrant Shares to be registered for resale or distribution  under the Securities
Act, all in accordance with the terms of the  Registration  Rights  Agreement in
the form annexed hereto as Exhibit C and made a part hereof.

8.       CONDITIONS PRECEDENT TO CLOSING.

(a) Conditions Precedent to Obligations of the Investors. The obligation of each
Investor to purchase the Notes and Warrants to be purchased by it at the Closing
hereunder is subject to the  fulfillment  on or prior to the Closing Date of the
following conditions:

         (i) Such Investor  shall have received an opinion,  addressed to it and
each other  Investor  and dated the  Closing  Date,  of  counsel to the  Company
acceptable to Investor, in the form of Exhibit D hereto and made a part hereof.

         (ii) The  representations  and  warranties  made by the Company  herein
shall be true and correct in all material respects on and as of the Closing Date
with the same effect as though such representations and warranties had been made
on and as of the  Closing  Date,  and the  Company  shall have  complied  in all
material respects with all covenants hereunder required to be performed by it at
or prior to the Closing Date.

         (iii) There shall not have occurred  and  be  continuing  any  Material
Adverse Effect.

         (iv) The purchase of the Notes and  Warrants  agreed to be purchased by
such Investor  hereunder  shall not be prohibited  or enjoined  (temporarily  or
permanently)  under  the laws of any  jurisdiction  to which  such  Investor  is
subject.

         (v) The Company and the Investors shall have executed the  Registration
Rights Agreement in substantially the form of Exhibit C hereto.

         (vi) All legal matters  incident to the  transactions  contemplated  by
this Agreement shall have been reasonably approved by counsel to the Investors.

         (vii) Not less than  $____________  of the Notes  offered  hereby shall
have been  subscribed  for by Investors as at the Closing  Date.  Following  the
Closing  Date and until 5:00 p.m.  (New York time) on the  thirtieth  (30th) day
following the Closing  Date,  the Company shall be entitled to continue to offer
the Notes and Warrants to additional

investors,  until such time as a maximum of $2,500,000 of Notes and an amount of
Warrants to be  determined by formula  shall have been sold;  provided  however,
that the  Investors  who have  subscribed at the Closing Date shall have a first
right of refusal with reference to the additional  $___________  of Notes and an
amount of Warrants  to be  determined  by  formulas  during this thirty (30) day
period.

         (viii) The  Investors  shall have  received  a  certificate,  dated the
Closing  Date,  and signed by the chief  executive  officer  or chief  financial
officer of the Company, stating that the conditions specified in subsections (i)
through (vii) of this Section 8(a) have been satisfied.

(b) Conditions  Precedent to  Obligations to the Company.  The obligation of the
Company to issue and sell the Notes and  Warrants to be issued  pursuant to this
Agreement is subject to the  fulfillment  on or prior to the Closing Date of the
following conditions:

         (i) The  representations  and warranties  made by the Investors  herein
shall be true and correct in all material respects on and as of the Closing Date
with the same effect as though such representations and warranties had been made
on and as of the Closing Date.

         (ii) The sale of the Notes and  Warrants  by the  Company  shall not be
prohibited or enjoined (temporarily or permanently) as of the Closing Date.

         (iii) The purchase of the Notes and Warrants  agreed to be purchased by
such Investor  hereunder  shall not be prohibited  or enjoined  (temporarily  or
permanently)  under  the laws of any  jurisdiction  to which  such  Investor  is
subject.

         (iv) All legal matters  incident to the  transactions  contemplated  by
this Agreement shall have been reasonably approved by counsel to the Company.

         (v) Not less than  $____________ of the Notes offered hereby shall have
been  subscribed for by Investors as at the Closing Date.  Following the Closing
Date and until 5:00 p.m. (New York time) on the  thirtieth  (30th) day following
the Closing  Date,  the Company shall be entitled to continue to offer the Notes
and Warrants to additional

investors,  until such time as a maximum of $2,500,000 of Notes and an amount of
Warrants to be  determined by formula  shall have been sold;  provided  however,
that the  Investors  who have  subscribed at the Closing Date shall have a first
right of refusal with reference to the additional  $___________  of Notes and an
amount of Warrants  to be  determined  by  formulas  during this thirty (30) day
period.

9.       CLOSING.

The  closing  hereunder  (the  "Closing")  shall take place at 10:00 A.M. at the
offices of  Greenberg  Traurig  Hoffman  Lipoff  Rosen & Quentel,  153 East 53rd
Street,  New York,  New York 10022 on or before June 24, 1998,  or at such other
location as may be mutually agreed upon. The date of such Closing is referred to
in this Agreement as the "Closing Date".

(a) At the  Closing,  in  addition  to  true  copies  of the  other  Transaction
Documents  duly  executed  by the  Company,  the Company  shall  deliver to each
Investor in the  respective  amounts set forth on Schedule 1 hereto:  (a) a duly
executed Note in the form of Exhibit A hereto,  and (b) a duly executed  Warrant
in the form of  Exhibit  B,  representing  the right to  purchase  the number of
Warrant  Shares set forth  opposite  such  Investor's  name on  Schedule  1, all
against  payment of the purchase  price therefor by wire transfer of immediately
available  funds or by certified or bank cashier's check payable to the order of
the Company.

(b) At the Closing, each Investor shall wire transfer the purchase price for the
Notes  subscribed to by such  Investor to following  attorneys'  escrow  account
established by Greenberg  Traurig Hoffman Lipoff Rosen & Quentel,  as counsel to
the Company,  or such other location and counsel as may be mutually agreed upon.
All of such funds shall be held in escrow by such counsel  until the Notes shall
have duly  executed by the Company and  delivered  by the Company or such escrow
agent to the subject Investor or its representative.

         Wire Instructions:

         Citibank N.A.
         153 East 53rd Street
         20th floor
         New York, New York 10043
         ABA #021000089
         Attn: Mr. James Frasier
         For credit to: Greenberg Traurig Hoffman
                  Lipoff Rosen & Quentel
         Escrow Account No. 3 7092076
         Reference: Environmental Remediation Holding
                  Corporation: Client No. 23769.01000

10.      ADJUSTMENT TO TERMS OF NOTES.

In the event and to the extent  that the Company  shall,  at any time within one
hundred and twenty (120) days  following the Closing Date,  issue any (a) notes,
debentures,  bonds  or  other  debt  instruments  which,  by  their  terms,  are
convertible into shares of Common Stock of the Company,  (b) shares of preferred
stock, which, by their terms, are convertible into shares of Common Stock of the
Company,  or (c) other  warrants,  options or rights which are  exercisable  for
shares of Common Stock of the Company,  excluding,  however, warrants or options
issued to key employees,  advisors and other  consultants in the ordinary course
of  business,  or  options,  warrants  or  stock  disclosed  in the  Form S-1 as
effective  (all of the  foregoing  referred  to herein as  "Other  Common  Stock
Equivalents"),  in each case, and such  instruments are actually  converted at a
conversion price which shall be lower than the Conversion Price set forth in the
Notes offered hereby, the Conversion Price for such time period set forth in the
Notes shall be  automatically  adjusted  and amended to be equal to the terms of
the lowest  conversion  price  provided  for in the  instruments  governing  the
issuance of such Other Common Stock Equivalents.

11.      EXCHANGE OF NOTES.

At the request of any holder of any Note and upon surrender of any such Note for
such purpose to the Company at its principal office,  the Company at its expense
will  issue  in  exchange   therefor  a  new  Note,  in  such   denomination  or
denominations  and  payable  to the  order  of such  payee or  payees  as may be
requested,  dated the date to which  interest  has been paid on the  surrendered
Note, in an aggregate  principal  amount equal to the  principal  balance of the
surrendered Note. Such new Note shall be in the form of the surrendered Note.

12.       REPLACEMENT OF NOTES

Upon  receipt of evidence  reasonably  satisfactory  to the Company of the loss,
theft,  destruction or mutilation of any Note and, in the case of any such loss,
theft or  destruction,  upon delivery of an indemnity bond by the holder in such
reasonable  amount as the  Company  may  determine,  or, in the case of any such
mutilation,  upon  surrender and  cancellation  of such Note, the Company at its
expense  will  execute and deliver,  in lieu  thereof,  a new Note of like tenor
dated the date to which  interest on such lost,  stolen,  destroyed or mutilated
Note has been paid.

13.      BROKERS.

(a) The  Investors  represent  and  warrant  to the  Company  that they have not
engaged or authorized any broker, finder, investment banker or other third party
to act on their behalf, directly or indirectly,  as a broker, finder, investment
banker  or in any  other  like  capacity  in  connection  with the  transactions
contemplated  by this  Agreement  nor have they  consented to or  acquiesced  in
anyone so acting,  and they know of no claim by any person for compensation from
them for so acting or of any basis for such a claim.

(b) The Company  represents and warrants to the Investors  that,  except for IHC
Group as disclosed  in Section  3(o) hereto,  neither the Company nor any of its
officers,  directors  or agents has engaged or  authorized  any broker,  finder,
investment  banker  or other  third  party  to act on its  behalf,  directly  or
indirectly, as a broker, finder, investment banker or in any other like capacity
in connection  with the  transactions  contemplated by this Agreement nor has it
consented to or acquiesced in anyone so acting,  and it knows of no claim by any
person for compensation from it for so acting or of any basis for such a claim.

14.      SURVIVAL OF REPRESENTATIONS, WARRANTIES AND COVENANTS.

All  representations,  warranties  and  agreements  of  the  Company  or of  the
Investors contained in this Agreement or in any certificate,  document, schedule
or instrument  delivered  pursuant  hereto shall survive for a period of two (2)
years the  Closing  hereunder  and the  delivery  of any and all  documents  and
instruments  hereunder,  regardless of any investigation made by or on behalf of
the  Investors or the Company,  respectively.  All  statements  contained in any
certificate, schedule or other document delivered by the Company pursuant hereto
in  connection  with  the  transactions  contemplated  hereby  shall  be  deemed
representations and warranties of the Company.

15.               NOTICES.

Any notices or other communications  required or permitted hereunder shall be in
writing and  personally  delivered or sent by  telecopier  or by  registered  or
certified  mail,  return  receipt  requested,   postage  prepaid,  addressed  or
telecopied  as follows or to such other  address or  telecopier  number of which
notice has been given pursuant hereto:

If to the Company:                  Environmental Remediation Holding Corp.
                                    3-5 Audrey Avenue
                                    Oyster Bay, New York 11771
                                    Attn: James A. Griffin, Secretary
                                    Fax: (516) 922-4312

                                    -and-

                                    Environmental Remediation Holding Corp.
                                    Attn: Noreen Wilson, Vice President and
                                    Chief Financial Officer
                                    Fax: (561) 624-1171

                                    With a copy to:
                                    Greenberg Traurig Hoffman Rosen
                                    Lipoff & Quentel
                                    Met Life Building
                                    200 Park Avenue
                                    New York, New York 10166
                                    Attn: Stephen A. Weiss, Esq.
                                    Tel: (212) 801-9200
                                    Fax: (212) 801-6400

                                    -and-

                                    Mintmire & Associates
                                    265 Sunrise Avenue,  Suite 204
                                    Palm Beach, FL  33480
                                    Attn: Donald F. Mintmire, Esq.
                                    Tel: (561) 832-5696
                                    Fax: (561) 659-5371

                                    If to the  Investors:To  the  addresses  set
                                    forth  below  the name of each  Investor  on
                                    Schedule  I annexed  hereto  and made a part
                                    hereof.

         16.      ENTIRE AGREEMENT: AMENDMENT ETC.

This Agreement and the Exhibits hereto  represents the entire  understanding and
agreement  among the parties  hereto with respect to the subject  matter hereof.
With the written consent of the holders of 66-2/3% of the outstanding  principal
amount of the  Notes,  the  obligations  of the  Company  and the  rights of the
holders  of the  Notes  may be  waived or  modified  (either  generally  or in a
particular  instance,  either  retroactively or  prospectively  and either for a
specified  period  of time or  indefinitely),  and  with the  same  consent  the
Company,  when  authorized by  resolution  of its Board of Directors  ("Approved
Company Resolutions"),  may enter into a supplementary agreement for the purpose
of adding any provisions to or changing in any manner or eliminating  any of the
provisions of this  Agreement.  Neither this Agreement nor any provision  hereof
may be changed,  waived,  discharged or terminated orally, except by a statement
in  writing  authorized  as  aforesaid  and  signed by the party  against  which
enforcement of the change, waiver, discharge or termination is sought.

17.      SUCCESSORS.

This  Agreement  shall be  binding  upon and shall  inure to the  benefit of the
parties hereto and their respective successors and assigns.

18.      SECTION READINGS.

The section headings contained in this Agreement are for reference purposes only
and shall not affect in any way the meaning or interpretation of this Agreement.

19.      APPLICABLE LAW.

This Agreement  shall be governed by,  construed and enforced in accordance with
the laws of the State of New York,  United States of America,  without reference
to or application of principles of conflicts of laws.

20.      SEVERABILITY.

If at any time  subsequent to the date hereof,  any provision of this  Agreement
shall be held by any court of  competent  jurisdiction  to be  illegal,  void or
unenforceable,  such  provision  shall  be of  no  force  and  effect,  but  the
illegality or  unenforceability  of such provision shall have no effect upon and
shall not impair the enforceability of any other provision of this Agreement.

21.       NO WAIVER.

The  failure  of any party at any time or times to  require  performance  of any
provision  hereof shall in no manner affect the right at a later time to enforce
the  same.  No waiver by any  party of any  condition,  or of the  breach of any
provision,  term,  covenant,   representation  or  warranty  contained  in  this
Agreement,  whether by conduct or otherwise,  in any one or more instances shall
be  deemed  to be  construed  as a  further  or  continuing  waiver  of any such
condition   or  of  the  breach  of  any  other   provision,   term,   covenant,
representation or warranty of this Agreement.

22.       RESOLUTION OF DISPUTES.

Any dispute regarding the  interpretation or application of this Agreement,  the
Note,  the  Warrant,  the  Registration  Rights  Agreement  or any of the  other
Transaction  Documents  which  cannot  be  settled  among the  parties  shall be
resolved in Austin,  Texas final and binding  arbitration in accordance with the
then obtaining  rules of the American  Arbitration  Association.  There shall be
appointed three arbitrators,  one of whom shall be selected by the Company,  the
second by the Investor(s) and the third by mutual agreement of the parties or by
the American Arbitration  Association.  The decision of the arbitrators shall be
final  and  upon  all  Investors  and the  Company  and may be  enforced  by the
prevailing party or parties in any court of competent  jurisdiction.  Each party
shall bear their own costs of the  arbitration and shall share equally the costs
of the arbitrators.

23.      ATTORNEY FEES.

Investors  shall  be  entitled  to  recover  from  the  Company  the  reasonable
attorneys'  fees and  expenses  (and  the  reasonable  costs  of  investigation)
incurred by such Holder in  connection  with  enforcement  by such Holder of any
obligation of the Company hereunder.

24.      REIMBURSEMENT FEES AND EXPENSES.

The Company shall, at the Closing,  reimburse  _________________  for reasonable
fees and expenses of its counsel in connection with the preparation, negotiation
and coordination of this Agreement.

25.      COUNTERPARTS.

This  Agreement  may be  executed in any number of  counterparts,  each of which
shall be deemed an original,  but all of which together shall constitute one and
the same instrument.

IN WITNESS  WHEREOF the parties  hereto have duly executed this  Agreement as of
the date first written.

                           ENVIRONMENTAL REMEDIATION HOLDING
                           CORPORATION

                                    By: _________________________________
                        James A. Griffin, Secretary

                                    By: _________________________________
                        Sam Bass, Chairman


         THE INVESTORS:

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

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

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

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

                                   SCHEDULE 1

Name and Address
of Investor           Amount of Note      No. of Warrants      Purchase Price


                                   SCHEDULE 2

                                  Subsidiaries

                   There are no subsidiaries other than BAPCO.

                                  SCHEDULE 3(f)

                        Litigation, Proceedings: Defaults


                    There is no litigation, nor are there any
                      proceedings or defaults that have not
                         been disclosed in SEC Reports.

                                  SCHEDULE 3(j)

                      Absence of Certain Changes or Events

      There were no changes or events which have not been disclosed in SEC
                                     Reports

                                  SCHEDULE 3(k)

                              Absence of Litigation

          There is no claim, action proceeding or litigation pending or
            threatened which has not been disclosed in an SEC Report

                                  SCHEDULE 3(l)

                                  Labor Matters

                                      None

                                  SCHEDULE 3(m)

                       Title to and Sufficiency of Assets

         There are Liens which have not been disclosed in an SEC Report

                                 SCHEDULE 3(n-1)

                         Environmental Matters - Notice

                                      None

                                 SCHEDULE 3(n-2)

                   Environmental Compliance - Hazardous Waste

                                      None

EXHIBITS

EXHIBIT A -                Form of 5.5% Convertible Note due June __, 2000
EXHIBIT B -                Form of Warrant
EXHIBIT C -                Form of Registration Rights Agreement
EXHIBIT D -                Opinion of Company Counsel