Document:

[Graphic omitted]   Electronic
                    Sensor Technology

May 16, 2005

Mr. Matthew Collier
115 Via Sandra
Thousand Oaks, CA 91320

Dear Matthew:

RE:  OFFER LETTER OF EMPLOYMENT

Electronic Sensor Technology (the "Company" and "EST") is pleased to confirm
your employment on the following terms:

     1.   POSITION. You will serve in the full time position of President and
          Chief Executive Officer reporting to the Chairman and responsible to
          the Board of Directors of the Company. You will also be nominated to
          serve on the Board subject to the Board's approval. The Chairman shall
          monitor and review your performance and have the ability to terminate
          your employment. Your employment shall commence upon the execution of
          this Agreement.

     2.   CASH COMPENSATION. The Company will pay you a salary at the rate of $
          220,000 per year, payable in accordance with the Company's standard
          payroll schedule. This salary will be subject to adjustment pursuant
          to the Company's employee compensation policies in effect from time to
          time but no escalation is guaranteed. The Company believes in pay-for
          performance and, as such, we offer you a potential target bonus of 25%
          of your annual salary based on the Company's success in improving
          sales, orders, and operating income, and launching strategic
          initiatives that the Board believes position the company well for the
          future. The Board will perform the necessary evaluation and pay this
          bonus, totally at its discretion, at the end of the first year of
          employment.

     3.   EQUITY-BASED COMPENSATION. Subject to approval by the Company's Board
          of Directors, you will receive a grant of, 75,000 shares of restricted
          stock that can be traded one year from the date of employment, and
          another 75,000 shares will be granted one year from the date of
          employment, if still employed by the company, tradable one year from
          issue on the anniversary date of your employment. In addition, you
          will receive a grant of 500,000 shares of stock options, 33% of which
          vest one year after the date of employment, 33% on the second
          anniversary date of employment , and 34% at the third anniversary date
          of employment . The strike price will be equal to the market value on
          the date this employment contract is signed. Commencing immediately
          after your date of hire, the Options will be subject to the terms and
          conditions of the applicable stock option agreement.

     4.   EMPLOYEE BENEFITS. As a regular employee of the Company, you will be
          eligible to participate in a number of Company-sponsored benefits
          including paid vacation, all in accordance with the Company's policies
          as in effect from time to time. In addition, you will be covered under

<PAGE>

          the Company's health, 401(K) and group insurance programs. In
          accordance with the Company's generally applicable policies, you will
          be reimbursed for all reasonable travel and business expenses incurred
          by you in connection with your employment duties.

     5.   ASSIGNMENT OF RIGHTS, NON-SOLICITATION, CONFIDENTIALITY AND
          NON-DISCLOSURE AGREEMENT. You agree to execute the Assignment of
          Rights, Non-Solicitation of Employees and Vendors, Confidentiality and
          Non-Disclosure Agreements as shall be provided to you by the Company.

     6.   TERMINATION: Employment may be terminated by the Company: (i) for
          cause, as defined, in which case the employee shall be entitled to
          receive only his base salary through the date of termination; (ii)
          without cause, in which case the employee shall be entitled to receive
          (a) continuation of his base salary for six months, (b) any bonus
          earned and/or accrued through the date of termination, and (c) six
          month acceleration of the unvested stock options; or (c) upon the
          death or long-term disability of the employee.

     7.   INDEMNIFICATION. To the fullest extent permitted by the Company's
          charter documents and applicable law, the Company agrees to defend and
          indemnify you and hold you harmless against any liability that you
          incur within the scope of your employment with the Company. The
          Company agrees to use its best efforts to purchase and maintain
          adequate Directors' and Officers' liability insurance.

     8.   EMPLOYMENT RELATIONSHIP. Your employment with the Company continues to
          be for no specific period of time. Your employment with the Company
          will continue to be "at will," meaning that either you or the Company
          may terminate your employment at any time and for any reason, with or
          without cause. Any contrary representations that may have been made to
          you are superseded by this letter agreement. This is the full and
          complete agreement between you and the Company on this term.

     9.   OUTSIDE ACTIVITIES. While you render services to the Company, you
          agree that you will not engage in any other employment, consulting or
          other business activity without the prior written consent of the
          Company, which consent shall not be unreasonably withheld. While you
          render services to the Company, you also will not assist any person or
          entity in competing with the Company, in preparing to compete with the
          Company or in hiring any employees or consultants of the Company.

     10.  WITHHOLDING TAXES. All forms of compensation referred to in this
          letter agreement are subject to reduction to reflect applicable
          withholding and payroll taxes and other deductions required by law.

     11.  ENTIRE AGREEMENT. Except as set forth herein, this letter agreement
          supersedes and replaces any prior agreements, representations or
          understandings, whether written, oral or implied, between you and the
          Company.

     12.  Your continued employment with EST is expressly contingent upon EST
          receiving, within seven (7) of your first day, the following:

          a.   Acceptable results from a background investigation. Any
               falsification of employment history or educational background
               will result in withdrawal of the offer and/or termination of
               employment.
          b.   Signed copies of the EST (i) Employee Agreement, (ii)
               Confidentiality Guidelines, and (iii) Code of Conduct, stating,
               among other things, that you will keep confidential company
               information throughout and beyond your employment with EST.
          c.   Satisfactory proof of identification and work authorization as
               required by the Immigration Reform and Control Act of 1990.

          Failure to execute the documents outlined above will be considered
          termination for cause.
<PAGE>

We hope that you will find the above terms acceptable. You may indicate your
agreement with these terms by signing and dating the enclosed letter agreement
and returning it to me. By signing this letter agreement, you reconfirm to the
Company that you have no contractual commitments or other legal obligations that
would prohibit you from performing your duties for the Company.

This offer of employment is open until Monday May 23rd, 2005 at 5:00 PM (Pacific
Time).

Let me close by reaffirming our belief that the skills and background you bring
to EST will be instrumental to the future success of the Company. Matt, I look
forward to working with you as CEO of EST.

Very truly yours,

/s/ Jim Frey
-------------------------------------
Jim Frey
Chairman

Electronic Sensor Technology, Inc.

I have read and accept and agree to the above terms of employment:

/s/ Matthew Collier
-------------------------------------
Matthew Collier

May 16, 2005
-------------------------------------
Datedexv10w1

 

EXHIBIT 10.1

SOLID WASTE DISPOSAL AGREEMENT

     THIS AGREEMENT is made this 3rd day of October, 2005, by and between Waste Corporation of
America, LLC, a Delaware limited liability company (hereinafter referred to as “Customer”), and WCA
Waste Corporation, a Delaware corporation (hereinafter referred to as “WCA”), for the disposal of
Customer’s non-hazardous construction and demolition debris. For purposes of this Agreement,
references to “Customer” shall include each of Customer’s subsidiaries that owns or operates a
transfer station in the State of Florida and references to WCA shall include each of WCA’s
subsidiaries that owns a landfill in the State of Florida.

TERMS

	1)	 	During the term of this Agreement and subject to the provisions hereof, Customer shall be
entitled to deliver all of Customer’s loose, non-compacted, construction and demolition debris
generated by any transfer station owned, directly or indirectly, by the Customer in the State
of Florida (hereinafter, the “Permitted Waste”) to any landfill owned, directly or indirectly,
in the State of Florida by WCA (collectively, the “Disposal Sites”). The Permitted Waste shall
exclude all compacted waste, waste, municipal solid waste, radioactive, volatile, highly
flammable, explosive, toxic or hazardous waste and special waste. The term “hazardous waste”,
as used herein, shall include, but not be limited to, any amount of waste listed or
characterized as hazardous in any Environmental Law. “Environmental Law” means any applicable
law, rule, regulation or ordinance concerning environmental protection including all
requirements pertaining to reporting, licensing, permitting, investigation, removal or
remediation of emissions, discharges, releases, or threatened releases of chemical substances,
pollutants or contaminants or relating to the manufacture, generation, processing,
distribution, use, recycling, treatment, storage, disposal, transport, or handling of
regulated materials, chemical substances, pollutants or contaminants, including, without
limitation, the Comprehensive Environmental Response, Compensation and Liability Act of 1980
(“CERCLA”), the Toxic Substance Control Act (“TSCA”), the Resource Conservation and Recovery
Act (“RCRA”), the Clean Air Act (“CAA”), the Clean Water Act (“CWA”), the Endangered Species
Act (“ESA”), the Occupational Safety and Health Act (“OSHA”), the Safe Drinking Water Act
(“SDWA”), the Hazardous Materials Transportation Act (“HMTA”), the Emergency Planning and
Community Right to Know Act (“EPCRA”) and the Federal Insecticide, Fungicide, Rodenticide Act
(“FIFRA”), and their state law counterparts, all as may have been amended. The term “special waste”, as used herein, shall include any non-hazardous solid
waste which requires special handling, management or disposal methods under federal or state
laws or regulations.

1

 

	2)	 	The Customer agrees, that to the extent deemed necessary by WCA, it will cause its wholly
owned subsidiaries which own or operate transfer stations in the State of Florida to execute a
copy of this Agreement and become a party hereto with the same obligations and liabilities that
the Customer has hereunder. WCA agrees, that to the extent deemed necessary by the Customer, it
will cause its wholly owned subsidiaries which own landfills in the State of Florida to execute
a copy of this Agreement and become a party hereto with the same obligations and liabilities
that WCA has hereunder.
	 
	3)	 	The term of this Agreement shall commence on the date set forth above and continue for a term
of three (3) years from the date of execution.
	 
	4)	 	For each loose, non-compacted cubic yard of Permitted Waste delivered to any Disposal Site,
Customer agrees to pay to WCA the Disposal Rate set forth on the attached Exhibit “A”
(“Disposal Rate”). The volume of Permitted Waste for purposes of determining the Disposal Rate
shall be conclusively presumed to be the full rated capacity of the container in which the
Permitted Waste is delivered.
	 
	5)	 	The Disposal Rate may be increased on the 1st anniversary of this Agreement to reflect the
percentage change in the CPI for the immediately preceding twelve months for which the CPI is
available (to a maximum of three percent (3%) per year). The Disposal Rate shall also be
adjusted to the extent of any increases in WCA’s costs resulting from changes in operating
costs (including, without limitation, fuel charges), local, state or federal laws, rules,
ordinances or regulations applicable to WCA’s operations or the service provided hereunder,
and increases in or additional taxes, fees or other governmental charges assessed against or
passed through to WCA (other than income or real property taxes), and such increases shall not
be withheld by the Customer. As used herein, CPI shall mean the Consumer Price Index for All
Urban Consumers (CPI-U), all items, published by the United States Department of Labor, Bureau
of Labor Statistics 1982-1984 = 100. In the event the United States Department of Labor,
Bureau of Labor Statistics ceases to publish the CPI, the parties agree to substitute another
equally authoritative measure of change in the purchasing power of the U.S. dollar as may be
then available.
	 
	6)	 	WCA shall invoice Customer monthly for all Permitted Waste delivered during the preceding
calendar month. The Disposal Rate does not include taxes, fees or assessments being charged to
the Disposal Sites by state, county, regional and local governmental agencies as of the date
of this Agreement.
	 
	7)	 	All payments pursuant to this Disposal Agreement shall be due forty-five (45) days from the
date of invoice. All payments not received within ten (10) days from the due date shall carry
interest at the lesser of the highest rate permitted by law or 1.5% per month.

2

 

	8)	 	WCA hereby agrees to indemnify and hold Customer harmless from and against any and all loss,
damage, suits, liability and expenses (including, but not limited to, reasonable investigation
and legal expenses) arising out of any claim for loss of or damage to property, including
Customer’s or WCA’s property, and injuries to or death of persons, including Customer’s or
WCA’s employees, to the extent caused by or resulting from the negligence or willful misconduct of, or violation of any federal, state or local laws or regulations by, WCA,
its employees or agents or WCA’s breach of the provisions of this Agreement. The foregoing
indemnification shall include any claim for costs of response made by a third party, including a
governmental agency, pursuant to the Comprehensive Environmental Response, Compensation and
Liability Act (commonly referred to as “Superfund”), except to the extent that any such claim is
the result of Customer’s sole or contributory negligence, intentional act, or Customer’s
delivery of waste to a Disposal Site which is not Permitted Waste as defined herein.
	 
	9)	 	Customer hereby agrees to indemnify and hold WCA harmless from and against any and all loss,
damages, suits, liability and expenses (including, but not limited to, reasonable
investigation and legal expenses) arising out of any claim for loss of or damage to property,
including Customer’s or WCA’s property, and injuries to or death of persons, including
Customer’s or WCA’s employees, to the extent caused by or resulting from (a) the negligence or
willful misconduct of, or violation of any federal, state of local laws or regulations by
Customer, its employees or agents; or (b) Customer’s breach of the provisions of this
Agreement.
	 
	10)	 	During the term of this Agreement, Customer shall maintain in full force and effect insurance
in the amounts set forth on Exhibit “B”. The issuer of any such policy shall be qualified to
transact insurance business in Florida, and Customer shall provide a Certificate of Insurance
to WCA upon request therefor.
	 
	11)	 	Each party is and shall perform this agreement as an independent contractor, and as such,
shall have and maintain complete control over all of its employees, agents and operations. No
party nor anyone employed by it shall be, represent, act, purport to act or be deemed to be
the agent, representative, employee or servant of either party.
	 
	12)	 	This Agreement may not be assigned in whole or in part by either party without the prior
written consent of the other. If WCA sells its business or subsequent all its assets to a
third party, this agreement will remain in force and affect and be binding upon a subsequent
purchaser of WCA’s business or assets. If: (a) the Customer undergoes a Change of Control (as
defined below); (b) any subsidiary of the Customer which owns or operates a transfer station
in the State of Florida undergoes a Change of Control; or (c) the Customer or any subsidiary
of the Customer sells, transfers or otherwise disposes of a transfer station in the State of
Florida, or discontinues operating any such transfer station, then in each case, WCA shall no
longer be obligated to accept Permitted Waste from the transfer station(s) that (x) are owned
by the Customer or a subsidiary of the

3

 

	 	 	Customer that has suffered a Change of Control, (y) were sold, transferred or otherwise disposed of or (z) that are no longer operated by the
Customer or any subsidiary of the Customer. For purposes of this Agreement, “Change of
Control” means (i) an acquisition by an individual or legal entity or “group” (as described in
Rule 13d-5(b)(1) promulgated under the Securities Exchange Act of 1934) of effective control
(whether through legal or beneficial ownership of capital stock of the Customer, by contract
or otherwise) of in excess of 50% of the voting securities of the Customer, or (ii) the
Customer merges into or consolidates with any other person, or any person merges into or
consolidates with the Customer and, after giving effect to such transaction, the stockholders of the Customer immediately prior to such transaction own less
than 50% of the aggregate voting power of the Customer or the successor entity of such
transaction, or (iii) the Customer sells or transfers its assets, as an entirety or
substantially as an entirety, to another person and the stockholders of the Customer immediately
prior to such transaction own less than 50% of the aggregate voting power of the acquiring
entity immediately after the transaction. A Change of Control for any subsidiary of the Customer
shall be determined the same was as a Change of Control for the Customer, substituting the
subsidiary for the Customer in the foregoing definition.
	 
	13)	 	As between the parties to this Agreement, WCA shall be deemed the sole owner of the Permitted
Waste upon its delivery to the working face of a Disposal Site.
	 
	14)	 	Neither WCA nor Customer shall be liable for the failure to perform their respective
obligations nor for any resulting damage or loss, if such failure is caused by a catastrophe,
riot, war, act of the legislature, by reason of final order by a court of record in a
proceeding not instituted by or acquiesced to by Customer or WCA, administrative order, or by
strike, fire, accident, act of God, failure of equipment, obstruction or damage to buildings,
lack of required access to roadways and bridges, electricity or other utility failure,
inability to access a Disposal Site, or other similar contingency beyond the reasonable
control of WCA or Customer. Neither party shall be due compensation from the other upon the
occurrence of any Force Majeure and for as long as the Force Majeure continues. Both WCA and
Customer shall resume full or substantial performance of their respective obligations under
this Agreement immediately upon cessation of the Force Majeure circumstances.
	 
	15)	 	Any notice, communication or statement required or permitted to be given hereunder shall be
in writing and deemed to have been sufficiently given when delivered in person or by
registered or certified mail, postage prepaid, return receipt requested, to the address of the
address of the respective party below:

	 	 	 
	If to WCA:

	 	WCA Waste Corporation

One Riverway, Suite 1400

Houston, Texas 77056

ATTN: Jerome M. Kruszka, President

4

 

	 	 	 
	With copy to:

	 	WCA Waste Corporation

One Riverway, Suite 1400

Houston, Texas 77056

ATTN: J. Edward Menger, General Counsel
	 
	 	 
	If to Customer:

	 	Waste Corporation of America, LLC

One Riverway, Suite 1400

Houston, Texas 77056

ATTN: Tommy Fatjo

          Either party may, by notice to the other, change the addresses and names above given.

	16)	 	The validity, interpretation and performance of this agreement shall be governed and
construed in accordance with the laws of the State of Texas.
	 
	17)	 	If any Section, subsection, sentence or clause of this agreement shall be adjudged illegal,
invalid or unenforceable, such illegality, invalidity or unenforceability shall not affect the
legality, validity or enforceability of the agreement as a whole or of any Section,
subsection, sentence or clause hereto not so adjudged.
	 
	18)	 	Any waiver by either party of any provision or condition of this agreement shall not be
deemed to be a waiver of any other provision of condition of this agreement, nor a waiver of a
subsequent breach of the same provision or condition, unless such waiver be so expressed in
writing and signed by the party to be bound.
	 
	19)	 	This Agreement may be amended only by the mutual agreement of the parties, in a writing to be
attached to and incorporated into this agreement.
	 
	20)	 	If WCA or Customer shall bring any action for any relief against the other, declaratory or
otherwise, arising out of or under this agreement, the losing party shall pay the successful
party a reasonable sum for attorneys’ fees in such suit and such attorneys’ fees shall be
deemed to have accrued on the commencement of such action and shall be paid whether or not
such action is prosecuted to judgment.
	 
	21)	 	The parties to this Agreement agree to keep the terms hereof confidential and shall not
reveal the terms hereof to any other party without the prior written consent of the other
party.
	 
	22)	 	Notwithstanding anything contained herein to the contrary, in addition to any other rights,
WCA has the right to terminate this Agreement in the event Customer delivers any material
other than Permitted Waste to a Disposal Site, or for any other material

5

 

	 	 	breach by Customer of the terms hereof.
	 
	23)	 	This Agreement, together with all Exhibits, represents the entire understanding and agreement
between the parties hereto relating to the transportation and disposal of Waste to the
Disposal Sites and supersedes any and all prior agreements, whether written or oral, that may
exist between the parties regarding same. No terms, conditions, prior understandings,
purchase orders, or agreement purporting to modify, vary, supplement or explain any provision
of this agreement shall be effective unless in writing, signed by representatives of both
parties authorized to amend this Agreement.
	 
	24)	 	This Agreement may be executed in multiple counterparts, each of which shall constitute an
original, but all in the aggregate shall constitute but one Agreement.

Executed effective the date first set forth above.

	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	WCA Waste Corporation	 	 	 	Waste Corporation of America, LLC
	 
	 	 	 	 	 	 	 	 	 	 	 	 	 	 
	By:

	 	/s/ Joseph J. Scarano, Jr.
	 	 	 	By:
	 	/s/ Robert P. Lancaster	 	 	 	 	 	 
	 

	 	 
	 	 	 	 	 	 	 	 	 	 	 	 
	Joseph J. Scarano, Jr., Vice President	 	 	 	Robert P. Lancaster
	 	 	 	 	 	 	Title: Director

6

 

Exhibit
“A”

Solid
Waste Disposal Agreement

WCA
Waste Corporation &

Waste
Corporation of America, LLC

          Any Florida Landfill                               $2.75 CY

7

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