EXHIBIT 10.21

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[spacer.gif] [spacer.gif] [spacer.gif] [spacer.gif] James J. Ritchie
Chairman
    
Quanta Capital Holdings Ltd.
Washington Mall
22 Church Street
Hamilton HM 11, Bermuda
441.294.6350         [spacer.gif] [spacer.gif] [html_301624quantalogo.jpg] 

March 11, 2008

Peter Johnson
36 Hubbard Avenue
Red Bank, NJ 07701

Dear Peter:

On September 11, 2006, Quanta Capital Holdings Ltd. entered into an employment
agreement with you (the ‘‘Employment Agreement’’). This letter is the first
amendment to the Employment Agreement and replaces, in its entirety, the fifth
paragraph of the Employment Agreement with the following paragraph:

In the event your employment with Quanta is terminated by Quanta within the
first twenty four (24) months of your employment for reasons other than
‘‘cause’’, as defined as in paragraph (k) of Quanta’s Stock Option Agreement
(see attached), you will be paid in one lump sum the greater of twelve months of
total severance or severance equal to the number of months remaining between
your termination of employment date and your second year anniversary with
Quanta. In the event that you are terminated for reasons other than cause
following your second year anniversary, severance will be a lump sum payment of
12 months. The lump sum shall be calculated using the monthly equivalent of your
eligible total annual cash compensation.

I would appreciate if you would sign and return this letter to confirm your
acceptance.

[spacer.gif] Sincerely,

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[spacer.gif]   [spacer.gif] [spacer.gif] Quanta Capital Holdings Ltd.  
[spacer.gif] [spacer.gif] By: [spacer.gif] [spacer.gif] /s/ James J.
Ritchie                           [spacer.gif] [spacer.gif]   [spacer.gif]
[spacer.gif] James J. Ritchie   [spacer.gif] [spacer.gif]   [spacer.gif]
[spacer.gif] Chairman

Accepted and agreed:

/s/ Peter D. Johnson
Peter D. Johnson

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