Document:

EXHIBIT 10.6

                                  AMENDMENT TO
                         EXECUTIVE EMPLOYMENT AGREEMENT

         Amendment  dated  December 13, 2004 to Executive  Employment  Agreement
dated April 30, 2001 between Hosting Site Network,  Inc., a Delaware corporation
(the "Company") and Scott Vicari (the "Executive").

         WHEREAS,  the  Company  and the  Executive  entered  into an  Executive
Employment  Agreement  dated  April 30,  2001,  as amended  December 2, 2002 and
December  10, 2003 (the  "Employment  Agreement")  pursuant  to which  3,000,000
shares  of  the  Company's  common  stock  (the  "Shares")  were  issued  to the
Executive; and

         WHEREAS,  the Shares were issued  subject to forfeiture  based upon the
term of Executive's employment with the Company; and

         WHEREAS,  the Company has not  commenced  material  operations  and the
parties deem it fair to increase the term which Executive must serve to earn the
Shares.

         NOW, THEREFORE, the parties hereto agree as follows:

         1.  Conflict  Resolution.  In the  event of any  conflict  between  the
provisions of this Amendment and the provisions of the Employment  Agreement the
provisions of this Amendment shall control. Except as otherwise provided herein,
the  provisions of the Employment  Agreement  shall continue with full force and
effect.

         2. Employment. Section 1 of the Employment Agreement is amended to read
as follows:

                  "1.  Employment.  The  Company  hereby  agrees to  employ  the
                  Executive for a term  beginning on the date of this  Agreement
                  and ending April 30, 2006 as its President, CEO and Treasurer,
                  and the Executive hereby accepts such employment in accordance
                  with the terms of this Agreement."

         3.  Compensation.  Section 3 of the Employment  Agreement is amended to
read as follows:

                           "3.   Compensation.   The  Executive   will  be  paid
compensation during this Agreement as follows:

                  (a) No base salary.

         (b) The Executive will be granted a total of 3,000,000 shares of common
         stock of the Company.  However,  if his employment  with the Company is
         terminated  prior to December 31, 2005 he forfeits the entire 3,000,000
         shares  of the  Company's  common  stock.  If his  employment  with the
         Company is terminated after December 31, 2005 but prior to December 31,
         2006 he  forfeits  2,000,000  shares  of the  Company's  stock.  If his
         employment  with the Company is terminated  after December 31, 2006 but
         prior to December 31, 2007 he forfeits the remaining  1,000,000  shares
         of the Company's stock."

         4. Execution.  This Amendment may be executed in separate counterparts,
each of which shall be deemed to be a fully executed  original as to all parties
that have executed any one or more of those counterparts.  The execution of this

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Amendment  and the  transmission  thereof by  facsimile  shall be binding on the
party signing and transmitting same by facsimile fully and to the same extent as
if a counterpart of this Amendment  bearing such party's original  signature had
been delivered.

         IN WITNESS WHEREOF,  the parties have executed this Amendment as of the
date first above written.

                                                    HOSTING SITE NETWORK, INC.

                                                    By: /s/ Scott Vicari
                                                        ----------------------
                                                        Name:  Scott Vicari
                                                        Title: President

                                                    /s/ Scott Vicari
                                                    --------------------------
                                                    Scott Vicari

                                       2EXHIBIT 10.1

                      SETTLEMENT AND MODIFICATION AGREEMENT

      This Settlement and Modification  Agreement  ("Agreement") is entered into
in  Santa  Ana,  California  as of  October  1,  2004 by and  between  VitroTech
Corporation, a Nevada corporation ("VitroTech"),  VitroCo Incorporated, a Nevada
corporation,  a  wholly  owned  subsidiary  of  VitroTech  ("VitroCo"),  Hi-Tech
Environmental  Products,  LLC, a Nevada limited liability  company  ("Hi-Tech"),
Enviro Investment  Group,  LLC, a Nevada limited liability company ("EIG"),  Red
Rock Canyon Mineral,  LLC, a California  limited  liability company ("Red Rock")
and Valley Springs Mineral, LLC, a California limited liability company ("Valley
Springs").  EIG, Red Rock and Valley Springs are sometimes collectively referred
to herein as the  "Mining  Companies".  The Mining  Companies  and  Hi-Tech  are
sometimes collectively referred to herein as the "Private Companies".  VitroTech
and VitroCo are collectively referred to herein as the "Public Companies".

                                    RECITALS

      A.    Pursuant  to an  agreement  dated  September  8, 1997  with  Candrea
Bennett, EIG has the right to mine and market that certain rhyolite type mineral
("Mineral")  located  on  property  owned by Ms.  Bennett in  Calaveras  County,
California.

      B.    Red Rock is the  owner of  certain  real  property  located  in Kern
County,  California (subject to a lien in favor of the seller, Joseph and Sheila
Mathewson), upon which is located Mineral.

      C.    Pursuant to a Purchase  and Sale  Agreement  dated  February 8, 2000
with Bernard  Dubnow and Henry  Cleary,  an  Agreement  dated March 6, 2002 with
Andrew  Capestro,  Trustee  of the Alpha  Operating  Trust,  which  rights  were
subsequently  assigned by Alliance  Asset  Management  Corp. to Valley  Springs,
Valley  Springs may have certain  rights to mine and market  Mineral  located on
property  currently  owned by the heirs of Messrs.  Dubnow and  Cleary,  as to a
tenancy in common interest,  and Mr. Capestro, as Trustee of the Alpha Operating
Trust, as to a tenancy in common interest.

      D.    The  Mining  Companies   entered  into  the  following   agreements,
respectively,  with Hi-Tech,  pursuant to which Hi-Tech was granted the right to
mine and market the Mineral on behalf of the Mining  Companies,  in exchange for
which Hi-Tech  agreed to pay to the Mining  Companies a purchase  price based on
each pound of Mineral sold from the respective properties:

            1.    EIG - Second Amended and Restated  Agreement dated as of March
16,  2001,  as amended by a First  Amendment  dated as of December  31,  2001, a
Second  Amendment  dated as of December 31, 2002, a Third  Amendment dated as of
February 2, 2004 and a Fourth Amendment dated February 10, 2004;

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            2.    Red Rock - Agreement  dated as of April 5, 2002, as amended by
a First Amendment  dated as of February 2, 2004 and a Second  Amendment dated as
of February 10, 2004; and

            3.    Valley  Springs  -  Agreement  dated as of April 5,  2002,  as
amended by a First Amendment dated as of February 2, 2004 and a Second Amendment
dated as of February 10, 2004.

      The Agreements  between the Mining  Companies and Hi-Tech are collectively
referred to herein as the "Mining Contracts".

      E.    Pursuant to an Assignment and  Assumption of Agreements  dated as of
February 3, 2004,  VitroCo  received an assignment of the rights and obligations
of  Hi-Tech  under the  Mining  Contracts,  in  consideration  of which  Hi-Tech
received  Fifteen Million  (15,000,000)  shares of VitroTech stock. In addition,
VitroCo and Hi-Tech  entered  into a Royalty  Agreement  dated as of February 3,
2004, as amended by a First Amendment dated February 10, 2004, pursuant to which
Hi-Tech is  entitled  to receive a royalty  based on each pound of Mineral  sold
from the respective properties.

      F.    The  purchase  price due the Mining  Companies  and the  royalty due
Hi-Tech are collectively referred to herein as the "Private Company Payments".

      G.    Over the years,  pursuant  to various  Private  Offering  Memoranda,
Hi-Tech  raised money from private  investors,  who  received  promissory  notes
("Notes"),  which  provide in part that the investors  would receive  contingent
interest based on each pound of Mineral sold from the respective properties,  up
to a certain  pre-determined  number of pounds.  The obligation to the investors
was assumed by VitroCo.

      H.    VitroTech  guaranteed the  obligations of VitroCo to pay the Private
Company  Payments and the Notes  (including  principal,  interest and contingent
interest) to the investors.

      I.    The purchase price due to the Mining  Companies and the  obligations
under  the  Notes to the  investors  pre-existed  the  assignment  of  rights to
VitroCo.  The royalty due Hi-Tech was created as consideration of the assignment
of the Mining Contracts to VitroCo, and occurred concurrently with the merger of
VitroCo Materials into Star Computing,  and the subsequent name change from Star
Computing to VitroTech.

      J.    It was  anticipated at the time of the merger that the Mineral would
be able to be sold to users, either by VitroCo directly or through distributors,
for a minimum of Five Dollars and Twenty Five Cents ($5.25) per pound.  Based on
that purchase  price,  and the anticipated  rate of sales,  there would be ample
cash flow to pay the Private Company Payments, sums due under the Notes, and for
VitroCo  to  maintain  an  appropriate  rate of  return.  The  overall  purchase
price/royalty  structure  was  created  based on  advice  from  Steve  Merry,  a
consultant  who was  retained to provide  advice in  connection  with the public
activities, and legal counsel Richardson & Patel, LLP as well as sales forecasts
created  by  Hi-Tech,  in  concert  with  Steve  Merry,  based on Steve  Merry's
representations about sales to international customers commencing in 2004.

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      K.    It was Hi-Tech's understanding that in addition to providing advice,
Steve Merry and Antony Gordon would raise  sufficient money for VitroTech to (i)
allow VitroCo to expand its sales force,  therefore accelerating sales, and (ii)
create a cash reserve  sufficient to allow VitroCo to operate until such time as
sales  occurred  and  VitroCo  was "cash  positive".  In  consideration  of such
obligation,  Steve Merry and Antony  Gordon,  through  Elgin  Investments,  LLC,
received Thirteen Million (13,000,000) shares of stock in VitroTech.  The monies
required are  evidenced  by a variety of schedules  prepared by both Hi-Tech and
Steve Merry.

      L.    VitroTech  subsequently  split its shares 4:1,  resulting in Hi-Tech
owning Sixty Million  (60,000,000) shares and Elgin Investments owning Fifty Two
Million (52,000,000) shares.

      M.    Sufficient  monies  were not raised and  significant  sales have not
occurred.

      N.    Some of the managers and members of the Private  Companies  are also
officers and/or employees of VitroTech and/or VitroCo.

      O.    One or more of the  shareholders of VitroTech has questioned (i) the
amount of the Private  Company  Payments  relative  to the market  price for the
Mineral,  and (ii) the  perceived  conflict of interest of  individuals  who are
managers  or  members  of the  Private  Companies,  as well as  officers  and/or
employees of VitroTech and/or VitroCo.  One of these shareholders,  on behalf of
1568931  Ontario Ltd.  ("Lender"),  has  delivered a letter to  VitroTech  dated
September  29, 2004,  pursuant to which the Lender would lend certain  monies to
VitroTech, and make certain other financial commitments, all as contained in the
letter,  based in part of the  restructure of the Private Company  Payments.  In
order to partially satisfy the Lender's  concerns of conflict of interest,  Jess
Rae Booth has resigned  his  positions  as  President  and CEO of VitroTech  and
VitroCo.

      P.    The  Private  Companies  have no  obligation  to amend  the  Private
Company  Payments,  the Mining  Contracts or the Royalty  Agreement.  The Mining
Contracts  provide that upon a default by VitroCo,  and  appropriate  notice and
opportunity to cure, the Mining  Companies have all rights  available to them at
law or in equity,  including but not limited to the right to terminate VitroCo's
rights under the Mining Contracts.

      Q.    VitroCo  has  requested  that the  Mining  Companies  not  currently
exercise  its  rights  to  claim  such an  event  of  default.  In  reliance  on
representations  and  warranties  from  VitroCo  that  it is in the  process  of
obtaining  financing,  which financing  should be sufficient to allow VitroCo to
(i) fund its current operations, and (ii) add sales people to increase sales, on
September 29, 2004, Jess Rae Booth, as Chairman Manager of the Mining Companies,
and James Kangas, as Chairman Manager of Hi-Tech, delivered a non-binding letter
to VitroTech,  pursuant to which it agreed to  restructure  the Private  Company
Payments in exchange for 17,107,657 shares of VitroTech stock.

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      R.    Nothing  herein  shall  affect  the  repayment  of the  Notes to the
investors, including principal, interest and contingent interest, the obligation
of which was assumed by VitroCo and guaranteed by VitroTech.

      S.    To the extent  applicable,  this Agreement  shall be deemed to be an
amendment to both the Mining  Contracts and the Royalty  Agreement.  Capitalized
terms  which  are  not  defined  herein  are  used as they  are  defined  in the
applicable Mining Contract and/or Royalty Agreement.

      Now, therefore, in consideration of the foregoing, and other consideration
actually received, the parties hereto agree as follows:

      1.    Sums Currently Due Private Companies.  Attached hereto as Schedule A
is a list of sums  due the  Private  Companies  as of the date  hereof  totaling
$1,085,652.98   ("Pre-Modification   Delinquencies").   The   Public   Companies
acknowledge the accuracy of Schedule A. The Mining Companies  currently have the
right to declare  VitroCo to be in default under the Mining  Contracts.  Hi-Tech
currently  has the right to declare  VitroCo to be in default  under the Royalty
Agreement.  Notwithstanding  the foregoing,  the Private  Companies  agree that,
solely as it  relates  to the  failure  to  currently  pay the  Pre-Modification
Delinquencies,  the Private Companies shall defer their right to declare VitroCo
to be in default  under the Mining  Contracts  or the  Royalty  Agreement  until
December 31, 2006; provided,  however,  that (i) at such time as VitroCo becomes
"cash flow  positive",  as defined  below,  all monies over and above  breakeven
shall  first be paid to the  Private  Companies  to reduce the  Pre-Modification
Delinquencies,  and (ii) to the extent possible, if VitroCo or VitroTech obtains
third party financing, it shall endeavor to include an allocation of monies from
such  financing to reduce the  Pre-Modification  Delinquencies.  Nothing  herein
shall otherwise limit the right of the Private  Companies to declare an event of
default  under the Mining  Contracts  and the Royalty  Agreement  for any reason
permitted thereunder.

      2.    No Defaults by Private Companies.  The Public Companies  acknowledge
and  agree  that  the  Private  Companies  have  performed  any and all of their
obligations  under the  Mining  Contracts,  the  Assignment  and  Assumption  of
Agreements and the Royalty Agreement, as well as any other agreement between the
Private  Companies  and the  Public  Companies,  and  that  none of the  Private
Companies have any further obligation thereunder.

      3.    Purchase Price and Royalty Payment to Private Companies.

            A.    Mining Companies.  Paragraph 5 of the EIG Mining Contract, and
paragraph  4 of the Red Rock  Mining  Contract  and the  Valley  Springs  Mining
Contract, are hereby amended to read as follows:

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            "Purchase  Price. In  consideration  of the exclusive right to mine,
remove and market the Mineral for sale, VitroCo shall pay to the Mining Company,
its successors or assigns,  from which mine the Mineral was removed, a sum equal
to ten  percent  (10%) of the "gross  sales  price"  per pound of  Mineral  sold
("Purchase Price")."

            B.    Hi-Tech.  Paragraph  5 of  the  Royalty  Agreement  is  hereby
amended to read as follows:

                  "Reservation  of Royalty.  Hi-Tech  reserves  and excepts unto
itself,  its  successors  and assigns a royalty equal to the sum of Five Percent
(5%) of the "gross sales price" per pound of Mineral  purchased  pursuant to the
Mining Contracts,  or any subsequent agreement with an Affiliated Mineral Entity
("Royalty").  Payment to Hi-Tech of the Royalty by VitroCo, or its successors or
assigns,  shall be due and payable  concurrently  with the  payments to EIG, Red
Rock and/or Valley Springs pursuant to their respective Mining Contracts,  or to
any  Affiliated  Mineral  Entity  pursuant to any  subsequent  agreement with an
Affiliated  Mineral  Entity,  including but not limited to payments which may be
paid to EIG, Red Rock,  Valley Springs (and/or an Affiliated  Mineral Entity) to
satisfy the Minimum  Requirements,  as defined in the  Amendments  to the Mining
Contracts."

            C.    Definition  of "Gross Sales  Price".  For purposes of both the
Mining Contracts and the Royalty  Agreement,  the "gross sales price" shall mean
the  actual  price  which  VitroCo  charges  to  a  third  party  (whether  to a
distributor, customer or otherwise). If any Mineral is provided to a third party
or otherwise used, and is not paid for (such as for testing purposes),  then for
purposes of  determining  the Purchase  Price and Royalty  Payment,  the average
sales  price of Mineral for the prior  calendar  quarter  shall be used.  If any
Mineral  is  sold  or  otherwise   transferred  to  a  third  party,   and  cash
consideration  is not paid by such third  party (i.e.  Mineral  which is used as
consideration for the purchase of third party stock or assets),  then the Mining
Companies  shall have the option of electing to receive either ten percent (10%)
of the benefit  received by VitroCo,  or the average  sales price of Mineral for
the prior calendar quarter for each pound of Mineral so sold or transferred, and
Hi-Tech shall have the option of electing to receive either five percent (5%) of
the benefit  received by VitroCo,  or the average sales price of Mineral for the
prior calendar quarter for each pound of Mineral so sold or transferred.  If the
Mineral is sold in a "value added" state,  such as, for example,  the Mineral is
compounded  prior to sale (and therefore  there is no actual sales price for the
Mineral), then the gross sales price shall be the average sales price of Mineral
for the prior calendar quarter for each pound of Mineral so sold or transferred.
The  purpose of this  paragraph  is for the  Private  Companies  to receive  ten
percent (10%) and five percent (5%),  respectively,  of the consideration  which
the Public Companies receive for the Mineral.

            D.    Net Payment.  The Purchase Price due the Mining  Companies and
the Royalty due Hi-Tech  shall not be reduced by any sum  whatsoever,  including
but not limited to taxes,  whether sales, use, ad valorum or otherwise,  fees or
other  obligations,  including  royalties  or payments to third  parties (all of
which shall be the obligation of VitroCo).

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            E.    Cash Flow Positive. Notwithstanding anything contained in this
paragraph 3, all sums due hereunder shall be deferred  (without  interest),  and
not  paid  by  VitroCo  to  the  Private  Companies,  until  such  time  as  the
Consolidated  Statement of Cash Flows for VitroTech  Corporation  indicates that
there is Positive Net Cash Flow from  Operating  Activities  for the time period
commencing on February 3, 2004 and terminating at the end of a calendar quarter.
The foregoing  analysis  shall be performed at the end of each calendar  quarter
until such time as the test is  satisfied.  Once  satisfied,  there  shall be no
further  deferral  of  Purchase  Price or Royalty  Payments  (even if  VitroTech
Corporation  ceases to have Positive Net Cash Flow from Operating  Activities in
the future for one or more  quarters).  The foregoing  deferral shall not affect
the amount of Purchase Price or Royalty  Payments due from VitroCo to the Mining
Companies  and  Hi-Tech,  as the case may be, but only the timing of the payment
thereof. For purposes of this definition "Operating Activities" means solely the
exploitation  of  the  use  of  the  Mineral  the  plastics  or   paint/coatings
industries.

            All  Purchase  Price and Royalty  Payments  first  becoming  due and
payable  after the end of the  calendar  quarter in which the  Positive Net Cash
Flow test is satisfied  shall be timely paid by VitroCo to the Mining  Companies
and  Hi-Tech,  as the case may be, as  otherwise  provided in this  paragraph 3.
After the  payment of all such  current  Purchase  Price and  Royalty  Payments,
within ten (10) days after the end of each calendar  quarter,  VitroCo shall pay
to the Private  Companies all Positive Net Cash Flow from Operating  Activities,
as shown on the Consolidated Net Cash Flow for VitroTech Corporation, until such
time as all of the deferred Purchase Price and Royalty Payments are paid.

            The  foregoing  "cash  flow  positive"  limitation  shall  expire on
December 31, 2005,  regardless  of whether or not  VitroTech is or has ever been
cash flow  positive.  At that point in time,  any then unpaid  Purchase Price or
Royalties shall be due and payable. The foregoing shall not apply to the payment
of Pre-Modification Delinquencies, which are the subject of paragraph 1 above.

            VitroCo's  obligation  to advance on the  Mining  Companies'  behalf
certain costs and expenses  relating to the properties  which are the subject of
the Mining Contracts are not subject to the limitations  contained in this "cash
flow positive"  provision,  and VitroCo shall timely pay same,  irrespective  of
their cash position.

            F.    Transfer  of Title.  Title to the  Mineral  shall be deemed to
have passed to VitroCo only when VitroCo both sells the Mineral to a third party
(whether a distributor,  customer or  otherwise),  and such Mineral has left the
physical possession of VitroCo. Until such time, and notwithstanding the mining,
removing  and  milling of the Mineral by  VitroCo,  title to the  Mineral  shall
remain with the applicable Mining Company.

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            G.    Timing of Payment - Calendar  Years 2004 and 2005.  Subject to
the "cash flow positive"  limitation  contained in paragraph E above,  for sales
made during  calendar years 2004 and 2005,  VitroCo shall pay the purchase price
due the Private  Companies on a monthly basis on or before the last business day
of the  following  month,  based on sales revenue  actually  received by VitroCo
(that is, cash or other  property  collected by VitroCo).  VitroCo  shall not be
obligated  to pay any sum to the  Private  Companies  until and  unless  VitroCo
actually receives payment for the Mineral.  VitroCo shall accompany payment with
evidence  reasonably  acceptable to the applicable Mining Company and Hi-Tech of
all revenues from Mineral actually received by VitroCo during the prior month.

            H.    Timing of Payment - Commencing  January 1, 2006. For all sales
made  commencing  January 1, 2006,  payment by VitroCo to the Private  Companies
shall be due and payable  within sixty (60) days after shipment to a third party
(whether customer, distributor or otherwise), or removal of the Mineral from the
Continental United States, whether or not such Mineral is sold. "Shipment" shall
be defined to mean when the Mineral has left VitroCo's  mine site,  warehouse or
processing facility, as the case may be. The payments due under this paragraph H
are not subject to the "cash flow positive"  limitations  contained in paragraph
E. Return of goods for any reason,  or the failure by VitroCo to receive payment
for any  shipment,  or any claim of product  liability,  defective  goods or the
like, shall not affect the timing of payment due hereunder,  or give rise to any
claim for reimbursement or offset by VitroCo against either the Mining Companies
or  Hi-Tech  (however,  VitroCo  shall  have no  obligation  to pay  the  Mining
Companies or Hi-Tech a second time if Mineral previously returned is resold).

      4.    Minimum Requirements.  The "Minimum  Requirements"  contained in the
Mining  Contracts is amended to provide  that there are no Minimum  Requirements
for pounds of Mineral sold in calendar years 2004 and 2005.  Commencing calendar
year 2006, and for every year thereafter, the Minimum Requirements will be equal
to the greatest number of pounds of Mineral sold during any prior year.

      5.    Issuance of stock to Hi-Tech.  In  consideration of the amendment to
the Mining  Contracts  and the Royalty  Agreement,  VitroTech  hereby  agrees to
issues 17,107,657 shares of VitroTech common stock to Hi-Tech, as follows:

            A.    On January 3, 2005,  VitroTech shall issue 5,000,000 shares of
its common stock.

            B.    On or  before  the  Applicable  Measurement  Date (as  defined
below)  beginning  in  2007  and  annually  thereafter  until  an  aggregate  of
12,107,657 shares (the "Additional Shares") shall have been issued (exclusive of
the shares issuable pursuant to Paragraph 5.A.),  VitroTech shall issue a number
of shares of its common stock  determined  pursuant to the Issuance  Formula (as
defined below).

            C.    The "Issuance  Formula"  shall be computed by (i)  multiplying
(a) the  Applicable  Year Payment Delta (as defined  below) by (b) 35%; and (ii)
dividing the product so  determined by the  Applicable  Year End Stock Price (as
defined below).

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            D.    The  "Applicable  Year Payment  Delta" shall be computed  with
respect  to each  calendar  year,  beginning  in 2006 and  continuing  until the
Additional  Shares have all been issued (each such year being  referred to as an
"Applicable  Year"),  by subtracting (i) the total Private Company  Payments for
the Applicable Year as determined  after giving effect to the provisions of this
Settlement  and  Modification  Agreement,  from (ii) the total  Private  Company
Payments for the Applicable Year that would have been due the Private  Companies
if this Settlement and Modification Agreement had not been executed.

            E.    The  "Applicable  Year End Stock  Price"  shall be the average
closing  price of  VitroTech's  common  stock over the five  trading  day period
ending on the last trading day of the Applicable Year. For purposes hereof,  the
"closing  price" shall mean the price of VitroTech's  common stock for such date
(or the nearest  preceding date) (i) on the primary Principal Market (as defined
below) on which the  common  stock is then  listed  or  quoted  as  reported  by
Bloomberg Financial L.P. (based on a Trading Day from 9:30 a.m. EST to 4:02 p.m.
Eastern  Time);  (ii) if the  Common  Stock is not then  listed or quoted on the
Principal  Market and if prices for the Common  Stock are then  reported  in the
"Pink Sheets"  published by the National  Quotation  Bureau  Incorporated  (or a
similar organization or agency succeeding to its functions of reporting prices),
the most recent bid price per share of the common stock so  reported;  or (c) in
all other cases,  the fair market value of a share of common stock as determined
by a  nationally  recognized-independent  appraiser  selected  in good  faith by
VitroTech. For purposes hereof,  "principal market" shall mean initially the OTC
Bulletin  Board and shall also include the  American  Stock  Exchange,  New York
Stock  Exchange,  the NASDAQ  Small-Cap  Market or the NASDAQ  National  Market,
whichever is at the time the principal trading exchange or market for the common
stock, based upon share volume.

            F.    The "Applicable  Measurement Date" shall mean, with respect to
each  Applicable  Year, the earlier date of (i) ten (10) business days following
the  completion  of the audit of  VitroTech  annual  financial  statements  with
respect  to an  Applicable  Year,  or  (ii)  April  15 of the  year  immediately
following an Applicable Year.

            G.    Each issuance of shares  pursuant to Paragraph 5.B above shall
be accompanied by a written  calculation  setting forth the Issuance Formula for
the  Applicable  Year in  question.  In the event  there are any  disputes  with
respect to the calculation of the Issuance Formula,  the same shall be submitted
to VitroTech's independent public accounting firm and said firm shall review all
applicable data and compute the Issuance Formula. The determination of such firm
shall be deemed conclusive.  In the event a dispute with respect to the Issuance
Formula is  submitted to the  independent  public  accounting  firm of VitroTech
pursuant to the  provisions  hereof and it is determined  that  VitroTech  under
computed the shares  issuable,  VitroTech  shall be solely  responsible  for the
payment of all fees  incurred as a result of  engaging  the  independent  public
accounting  firm in that  regard,  and  VitroTech  shall  immediately  issue the
additional shares to Hi-Tech.  Otherwise,  Hi-Tech and the Mining Companies will
be solely  responsible  for payment of such fees, in which case VitroTech  shall
have the right to withhold shares of common stock otherwise  issuable  hereunder
to satisfy those accounting fees based on the Applicable Year End Stock Price.

                                       8
<PAGE>

            6.    No Other  Modifications.  Except as expressly provided herein,
the Mining Contracts and the Royalty Agreement,  as well as all other agreements
between the Private Companies and the Public Companies, remain unmodified and in
full force and effect.

            7.    Release  of Private  Companies  Released  Parties.  The Public
Companies,  and  each of their  respective  parents,  subsidiaries,  affiliates,
officers,  directors,  agents,  servants,  employees,  successors,  assigns  and
representatives (collectively,  "Public Companies Affiliates") do hereby forever
release,  discharge  and acquit the Private  Companies  and their  predecessors,
successors,   assigns,  parents,  subsidiaries,   representatives,   affiliates,
officers,   directors,   managers,  members,  agents,  servants,  employees  and
attorneys,  as well as all  individuals  who are  current  or  former  officers,
directors, shareholders, employees and attorneys of the Public Companies who are
also current or former managers,  members, employees or attorneys of the Private
Companies (collectively,  "Private Companies Released Parties"), of and from any
and all claims, demands, obligations, liabilities,  indebtednesses,  breaches of
contract,  breaches of duty or any relationship,  acts, omissions,  misfeasance,
malfeasance,  cause  or  causes  of  action,  debts,  sums of  money,  accounts,
compensations,  contracts,  controversies,  promises, damages, costs, losses and
expenses,   of  every  type,  kind,  nature,   description  or  character,   and
irrespective of how, why, or by reason of what facts,  whether  heretofore,  now
existing or  hereafter  arising,  or which  could,  might,  or may be claimed to
exist,  of  whatever  kind or name,  whether  known  or  unknown,  suspected  or
unsuspected,  liquidated or unliquidated,  each as though fully set forth herein
at length  (hereinafter  "Claims")  which in any way arise out of, are connected
with or relate to the Mining Contracts,  the Assignment and Assumption of Assets
and the Royalty Agreement.

            As further  consideration  for this Agreement,  the Public Companies
hereby  agree,  represent and warrant that the matters  released  herein are not
limited  to  matters  which are known or  disclosed,  and the  Public  Companies
understand  and on advice  of  counsel,  hereby  waive  any and all  rights  and
benefits which they now have, or in the future may have,  conferred upon them by
virtue of the  provisions of Section 1542 of the  California  Civil Code,  which
provides as follows:

           A GENERAL  RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR  DOES
NOT KNOW OR SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING  THE RELEASE,
WHICH IF KNOWN BY HIM MUST HAVE  MATERIALLY  AFFECTED  HIS  SETTLEMENT  WITH THE
DEBTOR.

            In this connection, the Public Companies hereby agree, represent and
warrant that they realize and  acknowledge  that factual  matters now unknown to
them may have  given or may  hereafter  give rise to  Claims,  and they  further
agree,  represent and warrant that this Agreement has been negotiated and agreed
upon in light of that  realization and that they  nevertheless  hereby intend to
release,  discharge and acquit the parties set forth  hereinabove  from any such
Claims.

                                       9
<PAGE>

            The Public Companies  hereby state that they have read,  understand,
and on the advice of counsel,  hereby waive,  relinquish and release the Private
Companies and all Private Company Released Parties as hereinabove provided.

            8.    Indemnification by the Public Companies.  The Public Companies
represent and warrant that they have not heretofore assigned or transferred,  or
purported to assign or transfer, to any person, firm, or corporation whomsoever,
any action or  actions,  causes of action in law or equity,  suit,  debt,  lien,
liabilities,  claim, demand,  damages,  losses, costs or expenses, of any nature
whatsoever  that are herein  released.  Public  Companies agree to indemnify and
hold  harmless  Private  Companies  and all related  parties  against  action or
actions,  causes of action in law or  equity,  suit,  debt,  lien,  liabilities,
claim,  demand,  damages,  losses,  costs or expenses,  of any nature whatsoever
based on,  arising out of or in connection  with any such transfer or assignment
or  purported  transfer or  assignment,  as well as any Claim made by any Public
Company shareholder which is the subject to the release contained herein.

            9.    Independent Advice of Counsel. The parties hereto, and each of
them, represent and declare that in execution of this Agreement they rely solely
on their own judgment,  belief and knowledge, and the advice and recommendations
of their own independently  selected counsel,  concerning the nature, extent and
duration of their rights and claims,  and that they have not been  influenced to
any extent  whatsoever in executing the same by any of the parties  hereto or by
any person requesting them, or any of them.

            10.   Voluntary  Agreement.  The parties  hereto,  and each of them,
further  represent and declare that they have  carefully read this Agreement and
know the contents thereof, and that they sign the same freely and voluntarily.

            11.   Payment of Legal Fees. As additional consideration, the Public
Companies  agree to pay the legal fees  incurred  by the  Private  Companies  in
connection with the negotiation and preparation of this Agreement and the review
and/or  negotiation  of the  Lender's  documents  as it relates  to the  Private
Companies, payable upon mutual execution of this Agreement, or if incurred after
such date, on the first day of the month  thereafter.  The legal fees paid shall
reduce the Pre-Modification Delinquencies.

            12.   Payment of Lease Obligations. Hi-Tech executed an office lease
dated  June 2,  2003 for the  office  space  currently  occupied  by the  Public
Companies. The Public Companies shall be responsible for the payment of rent and
any other sum due under the Lease, and shall indemnify Hi-Tech against same. The
Public  Companies  shall have the right to request that Hi-Tech assign the Lease
or sublet all or a portion of the  premises,  provided (i) the Public  Companies
bear any expense  relating  thereto,  and (ii) the Public  Companies  locate the
proposed assignee or sublessee(s).  Such assignment and/or sublease(s) shall not
affect the Public Companies'  obligation to pay rent and any other sum due under
the Lease.

                                       10
<PAGE>

            13.   Obligations under Notes. Any party who assumes the obligations
of the Public  Companies  under the Private Company  Agreements  (whether or not
through a bankruptcy proceeding), including but not limited to the Lender, shall
also be deemed  to have  assumed  the  obligations  under  the Notes  (including
principal, interest and contingent interest).

            14.   Disclosure re Valley  Springs.  Valley Springs is the assignee
from Alliance Asset Management  Corp. of two agreements:  (i) the agreement with
Henry Cleary and Bernard  Dubnow,  and (ii) the agreement with Andrew  Capestro,
Esq.,  Trustee for the Alpha  Operating  Trust.  Paragraph 4.2 of the Dubnow and
Cleary agreement provides that escrow must close no later than three years after
opening of escrow (which would have been  February,  2003) in which case Messrs.
Dubnow and Cleary were  obligated to assign to Valley  Springs any rights it had
against Mr. Capestro.

            Escrow  did not  close,  and no formal  demand  has been made by the
heirs of Messrs.  Dubnow and Cleary to terminate the purchase  agreement because
of such failure to close.  However,  counsel for the Private Companies  recently
received  a letter  from  counsel  for the heirs of  Messrs.  Cleary  and Dubnow
requesting  that  Alliance  Asset or Valley  Springs  close escrow now at a cash
price of One Million Five Hundred Thousand Dollars ($1,500,000.00).  That letter
has been provided to the Public Companies.

            Paragraph   7.C.  of  the  Capestro   agreement   provides  that  if
entitlements  are not  obtained  within  two years of the date of the  agreement
(which  would have been March 6, 2004),  that Mr.  Capestro  can  terminate  the
agreement. Valley Springs has received no notice from Mr. Capestro of his desire
to terminate the agreement.  However, counsel for the Private Companies recently
received a letter from Mr. Capestro, stating that Mr. Capestro would release his
attorneys' fee lien and dismiss with prejudice his lawsuit  conditioned upon the
closing of the  transaction  with the heirs of Messrs.  Dubnow and Cleary.  That
letter has been provided to the Public Companies.

            It is the obligation of the Public Companies to advance the sums due
the heirs of Messrs.  Dubnow and Cleary,  as well as the sums due Mr.  Capestro.
However,  because the Public  Companies do not have the resources to advance the
monies close escrow with the heirs of Messrs. Dubnow and Cleary, Valley Springs,
with the consent of the Public Companies, shall attempt to renegotiate the terms
of the  agreement  with the heirs of  Messrs.  Dubnow and  Cleary,  and with Mr.
Capestro.  Any such renegotiation shall be binding on the Public Companies.  The
Public  Companies are aware that the  renegotiation  may not be successful,  and
Valley  Springs  shall  have  the  right,  if it so  elects,  to  terminate  the
agreements with the heirs of Messrs. Dubnow and Cleary, and with Mr.Capestro.

            If the Public  Companies  obtain the right to the Mineral located on
the Valley Springs  property,  then the purchase price which would  otherwise be
due Valley  Springs  under  paragraph  3.A.  above and the  royalty  which would
otherwise be due Hi-Tech  under  paragraph  3.B.  shall apply.  If Mr.  Capestro
agrees to accept as  compensation  two-thirds  of the purchase  price due Valley
Springs,  then such amount due Mr.  Capestro shall be offset against the sum due
Valley Springs. If Mr. Capestro is not willing to reduce his compensation,  then
the Public Companies shall pay to Valley Springs its full purchase price per the
terms of paragraph  3.A.  above,  and the Public  Companies  shall be separately
responsible  for the payment of any  compensation  due Mr. Capestro or any third
party.

                                       11
<PAGE>

            15.   Miscellaneous. This Agreement shall be governed by the laws of
the  State of  California.  Venue  for any  action  shall be in  Orange  County,
California.  This Agreement  shall be binding upon, and inure to the benefit of,
the  parties  hereto  and  their  respective  successors,   assigns,  heirs  and
representatives. This Agreement is the entire agreement among the parties hereto
with respect to the subject matter hereof,  and supersedes all prior  agreements
and  understandings.  Any modification to this Agreement shall be in writing and
executed by each party hereto.  Each party  represents  and warrants that it has
the  authority  to enter  into this  Agreement,  and that the  party or  parties
signing  same have the  authority  to do so. If either  party  hereto  commences
proceedings to enforce the terms of this  Agreement,  the party that prevails in
such  proceeding  shall be entitled to recover its reasonable  attorneys'  fees,
court  costs  and  litigation  expenses.  This  Agreement  may  be  executed  in
counterparts. Time is of the essence of this Agreement.

                                       12
<PAGE>

      IN WITNESS WHEREOF,  the parties hereto have executed this Agreement as of
the date and year first above written.

PRIVATE COMPANIES:                                  PUBLIC COMPANIES:

HI-TECH ENVIRONMENTAL PRODUCTS,                     VITROTECH CORPORATION,
LLC, a Nevada limited liability company             a Nevada corporation

By:____________________________________             By:_________________________
   James Kangas, Chairman Manager
                                                       Its:_____________________
ENVIRO INVESTMENT GROUP, LLC,
a Nevada limited liability company                  By:_________________________

By:____________________________________                Its:_____________________
   Jess Rae Booth, Chairman Manager

RED ROCK CANYON MINERAL, LLC,                       VITROCO INCORPORATED,
a California limited liability company              a Nevada corporation

By:____________________________________             By:_________________________
   Jess Rae Booth, Chairman Manager
                                                       Its:_____________________
VALLEY SPRINGS MINERAL, LLC,
a California limited liability company              By:_________________________

By:____________________________________                Its:_____________________
   Jess Rae Booth, Chairman Manager

                                       13
<PAGE>

                                    EXHIBIT A

As of 9-30-04, the Public Companies owe the following amounts:

1.    HI-TECH:

      a.    Balance owed to Hi-Tech at date of merger (2-3-04)           $ None

      b.    Net cash advances from Hi-Tech to VitroCo between
            2-3-04 and 9-30-04                                      $416,556.29

      c.    Royalties due to Hi-Tech based on collected sales
            between 2-3-04 and 9-30-04                               $28,164.99

      Balance owed to Hi-Tech at 9-30-04                            $444,721.28

2.    ENVIRO INVESTMENT GROUP:

      a.    Balance owed to EIG at date of merger (2-3-04)          $731,541.58

      b.    Payments to EIG between 2-3-04 and 9-30-04             ($115,446.75)

      c.    Purchase payments due to EIG based on collected sales
            between 2-3-04 and 9-30-04                               $24,836.87

      Balance owed to EIG at 9-30-04                                $640,931.70

                                       14

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